Thytronic NA20 Manuale utente

NA20 - Manual - 04 - 2022

MANUAL

NA20

PHASE, NEGATIVE SEQUENCE,

RESIDUAL OVERCURRENT, THERMAL IMAGE

PROTECTION RELAY

NA20 - Manual - 04 - 2022

TABLE OF CONTENTSTABLE OF CONTENTS

1 INTRODUCTION 5

Scope and liability...........................................................................................................................................................................................5

Applicability......................................................................................................................................................................................................5

Conformity ........................................................................................................................................................................................................5

Copyright...........................................................................................................................................................................................................5

Warranty...........................................................................................................................................................................................................5

Safety recommendations...............................................................................................................................................................................5

Insulation tests ................................................................................................................................................................................................5

Product identification .....................................................................................................................................................................................6

Environment .....................................................................................................................................................................................................6

Graphical conventions ...................................................................................................................................................................................6

Glossary/definitions........................................................................................................................................................................................6

2 GENERAL 10

Preface........................................................................................................................................................................................................... 10

Photo .............................................................................................................................................................................................................. 10

Main features.................................................................................................................................................................................................11

3 TECHNICAL DATA 12

3.1 GENERAL............................................................................................................................................................................................................12

Product standard for measuring relays.....................................................................................................................................................12

Mechanical data ...........................................................................................................................................................................................12

Insulation ........................................................................................................................................................................................................12

Voltage dip and interruption........................................................................................................................................................................12

EMC tests for interference immunity.........................................................................................................................................................12

Emission......................................................................................................................................................................................................... 13

Mechanical tests.......................................................................................................................................................................................... 13

Climatic tests................................................................................................................................................................................................. 13

Safety ............................................................................................................................................................................................................. 13

Certifications................................................................................................................................................................................................. 13

3.2 INPUT CIRCUITS ...............................................................................................................................................................................................14

Auxiliary power supply Uaux ......................................................................................................................................................................14

Phase current input circuits........................................................................................................................................................................14

Residual current input circuit......................................................................................................................................................................14

Binary input circuits......................................................................................................................................................................................14

Block input (Logic selectivity).....................................................................................................................................................................14

3.3 OUTPUT CIRCUITS............................................................................................................................................................................................14

Relays..............................................................................................................................................................................................................14

Block output (Logic selectivity)...................................................................................................................................................................14

3.4 MMI.....................................................................................................................................................................................................................15

3.5 COMMUNICATION INTERFACES ...................................................................................................................................................................15

Local port........................................................................................................................................................................................................15

Remote ports..................................................................................................................................................................................................15

3.6 GENERAL SETTINGS ........................................................................................................................................................................................16

3.7 PROTECTIVE FUNCTIONS ...............................................................................................................................................................................16

Base current - IB...........................................................................................................................................................................................16

Thermal protection with Pt100 probes - 26 ...............................................................................................................................................16

Undercurrent - 37..........................................................................................................................................................................................16

Negative sequence overcurrent - 46.........................................................................................................................................................16

Negative sequence / positive sequence current ratio - I2 / I1..............................................................................................................17

Thermal image - 49....................................................................................................................................................................................... 18

Phase overcurrent - 50/51........................................................................................................................................................................... 18

Residual overcurrent - 50N/51N ................................................................................................................................................................ 19

Breaker failure - BF...................................................................................................................................................................................... 20

3.8 CONTROL AND MONITORING........................................................................................................................................................................21

Second harmonic restraint - 2ndh-REST...................................................................................................................................................21

Trip Circuit Supervision - 74TCS..................................................................................................................................................................21

Selective block - BLOCK2 ............................................................................................................................................................................21

Circuit Breaker supervision.........................................................................................................................................................................21

CT supervision - 74CT ...................................................................................................................................................................................21

Pilot wire diagnostic .....................................................................................................................................................................................21

Demand measures........................................................................................................................................................................................21

Oscillography (DFR) ......................................................................................................................................................................................22

PLC (Programmable Logic Controller) .......................................................................................................................................................22

NA20 - Manual - 04 - 2022

3.9 METERING......................................................................................................................................................................................................... 23

Accuracy (type tests)................................................................................................................................................................................... 23

Measures....................................................................................................................................................................................................... 23

4 FUNCTION CHARACTERISTICS 24

4.1 HARDWARE DESCRIPTION.............................................................................................................................................................................24

Power supply board......................................................................................................................................................................................25

CPU board.......................................................................................................................................................................................................25

Input board .....................................................................................................................................................................................................25

MMI (keyboard, LED and display) ..............................................................................................................................................................25

4.2 SOFTWARE DESCRIPTION ..............................................................................................................................................................................26

Base software................................................................................................................................................................................................26

Real-time operating system.........................................................................................................................................................................26

Task..................................................................................................................................................................................................................26

Drivers.............................................................................................................................................................................................................27

Application Software....................................................................................................................................................................................27

Data Base.......................................................................................................................................................................................................27

Self test (Application) ...................................................................................................................................................................................27

Development tools (Builder)........................................................................................................................................................................27

4.3 I/O DESCRIPTION............................................................................................................................................................................................. 28

Metering inputs ............................................................................................................................................................................................ 28

Signal processing......................................................................................................................................................................................... 28

Conventions....................................................................................................................................................................................................31

Use of measured values...............................................................................................................................................................................32

Binary inputs ................................................................................................................................................................................................. 33

Output relays................................................................................................................................................................................................. 38

LED indicators............................................................................................................................................................................................... 40

Communication interfaces...........................................................................................................................................................................42

4.4 PROTECTIVE ELEMENTS ................................................................................................................................................................................ 43

Rated values.................................................................................................................................................................................................. 43

Thermal protection with RTD thermometric probes - 26 ........................................................................................................................45

Negative sequence overcurrent - 46........................................................................................................................................................ 49

Negative sequence current / positive sequence current ratio - I2/I1..................................................................................................56

Phase overcurrent - 50/51........................................................................................................................................................................... 69

Residual overcurrent - 50N/51N ................................................................................................................................................................ 79

4.5 CONTROL AND MONITORING........................................................................................................................................................................91

Logical block - BLOCK1................................................................................................................................................................................91

Selective block -BLOCK2 ............................................................................................................................................................................ 93

Remote tripping ............................................................................................................................................................................................ 98

Frequency tracking...................................................................................................................................................................................... 99

Second Harmonic Restraint - 2ndh-REST .............................................................................................................................................. 100

Cold Load Pickup - CLP ..............................................................................................................................................................................101

Trip circuit supervision - 74TCS.................................................................................................................................................................104

Circuit breaker supervision .......................................................................................................................................................................107

Oscillography ............................................................................................................................................................................................. 110

5 MEASURES, LOGIC STATES AND COUNTERS 111

Protection .....................................................................................................................................................................................................111

Delayed inputs.............................................................................................................................................................................................111

Internal states..............................................................................................................................................................................................111

Counters........................................................................................................................................................................................................112

Self test .........................................................................................................................................................................................................112

Selective Block - BLOCK2......................................................................................................................................................................... 113

Fault recording - SFR................................................................................................................................................................................. 113

Event recording - SER................................................................................................................................................................................ 113

Oscillography - DFR ....................................................................................................................................................................................114

NA20 - Manual - 04 - 2022

6 INSTALLATION 116

6.1 PACKAGING.....................................................................................................................................................................................................116

6.2 MOUNTING......................................................................................................................................................................................................116

6.3 ELECTRICAL CONNECTIONS ....................................................................................................................................................................... 120

6.4 NOMINAL CURRENT InAND IEn SETTING ............................................................................................................................................... 130

6.5 LED ALLOCATION............................................................................................................................................................................................134

6.6 FINAL OPERATIONS .......................................................................................................................................................................................134

7 PROGRAMMING AND SETTINGS 135

7.1 SW ThyVisor ....................................................................................................................................................................................................135

ThyVisor installation....................................................................................................................................................................................135

ThyVisor use.................................................................................................................................................................................................135

7.2 MMI (Man Machine Interface) ....................................................................................................................................................................136

Reading variables (READ)..........................................................................................................................................................................136

Setting modifying (SET) ..............................................................................................................................................................................136

TEST.............................................................................................................................................................................................................. 138

COMMUNICATION..................................................................................................................................................................................... 138

Circuit breaker commands ....................................................................................................................................................................... 139

Enable / block changes via keyboard - Password................................................................................................................................ 139

7.3 MODULES MANAGEMENT .......................................................................................................................................................................... 140

7.4 MAINTENANCE...............................................................................................................................................................................................141

7.5 REPAIR..............................................................................................................................................................................................................141

7.6 PACKAGING.....................................................................................................................................................................................................141

8 APPENDIX 142

8.1 APPENDIX A1 - Inverse time IEC curves ...................................................................................................................................................142

Mathematical formula................................................................................................................................................................................142

Negative sequence overcurrent 46 - Standard inverse time curve (IEC 60255-3/BS142 type A) ................................................ 143

Negative sequence overcurrent 46 - Very inverse time curve (IEC 60255-3/BS142 type B)..........................................................144

Negative sequence overcurrent 46 - Extremely inverse time curve (IEC 60255-3/BS142 type C) ................................................145

Phase overcurrent 50/51 - Standard inverse time curve (IEC 60255-3/BS142 type A)....................................................................146

Phase overcurrent 50/51 - Very inverse time curve (IEC 60255-3/BS142 type B) ............................................................................147

Phase overcurrent 50/51 - Extremely inverse time curve (IEC 60255-3/BS142 type C).................................................................. 148

Phase overcurrent 50/51 - long time inverse curve (IEC BS B LI)..................................................................................................... 149

Residual overcurrent 50N/51N - Standard inverse time curve (IEC 60255-3/BS142 type A) ........................................................ 150

Residual overcurrent 50N/51N - Very inverse time curve (IEC 60255-3/BS142 type B)..................................................................151

Residual overcurrent 50N/51N - Extremely inverse time curve (IEC 60255-3/BS142 type C) ........................................................152

Residual overcurrent 50N/51N - long time inverse curve (IEC BS B LI)........................................................................................... 153

8.2 APPENDIX A2 - Inverse time ANSI/IEEE curves .......................................................................................................................................154

Mathematical formula................................................................................................................................................................................154

Negative sequence overcurrent 461 - Moderately inverse time curve (ANSI/IEEE type MI).......................................................155

Negative sequence overcurrent 46 - Very inverse time curve (ANSI/IEEE type VI).......................................................................156

Negative sequence overcurrent 46 - Extremely inverse time curve (ANSI/IEEE type EI)..............................................................157

Phase overcurrent 50/51 - Moderately inverse time curve (ANSI/IEEE type MI)........................................................................... 158

Phase overcurrent 50/51 - Very inverse time curve (ANSI/IEEE type VI) ........................................................................................ 159

Phase overcurrent 50/51 - Extremely inverse time curve (ANSI/IEEE type EI)............................................................................... 160

Residual overcurrent 50N/51N - Moderately inverse time curve (ANSI/IEEE type MI) .................................................................161

Residual overcurrent 50N/51N - Very inverse time curve (ANSI/IEEE type VI) ...............................................................................162

Residual overcurrent 50N/51N - Extremely inverse time curve (ANSI/IEEE type EI)..................................................................... 163

8.3 APPENDIX A3 - Inverse time - RECTIFIER, I2t and EM curves ................................................................................................................164

Mathematical formula................................................................................................................................................................................164

Phase overcurrent 50/51 - Rectifier curves............................................................................................................................................165

Negative sequence overcurrent 46 - I2t inverse curves (I2t=K) .........................................................................................................166

Phase overcurrent 50/51 - I2t inverse curves (I2t=K) ............................................................................................................................167

Negative sequence overcurrent 46 - Electromechanical inverse curves (EM) .............................................................................. 168

Phase overcurrent 50/51 - Electromechanical inverse curves (EM)................................................................................................. 169

Residual overcurrent 50N/51N - Electromechanical inverse curves (EM)....................................................................................... 170

8.4 APPENDIX B1 - I/O Diagram .........................................................................................................................................................................171

8.5 APPENDIX B2 - Interfaces ............................................................................................................................................................................172

8.6 APPENDIX B3- Connection diagrams ........................................................................................................................................................ 173

8.7 APPENDIX C - Dimensions............................................................................................................................................................................176

8.8 APPENDIX D - Setting table..........................................................................................................................................................................177

8.9 APPENDIX E - EC Declaration of conformity............................................................................................................................................. 208

INTRODUCTION 5

NA20 - Manual - 04 - 2022

1 INTRODUCTION1 INTRODUCTION

Scope and liability

This document describes the functions, the technical data of NA20 devices; instructions for mount-

ing, setting and commissioning are included.

This manual has been checked out, however, deviations from the description cannot be completely

ruled out, so that no liability in a legal sense for correctness and completeness of the information or

from any damage that might result from its use is formally disclaimed.

The information given in this document is reviewed regularly; any corrections and integration will be

included in subsequent editions that are identiﬁed by the date of revision.

We appreciate any suggestions for improvement.

We reserve the right to make technical improvements without notice.

Applicability

This manual is valid for NA20 devices with ﬁrmware version 2.70 and following.

Conformity

The product complies with the CEE directives:

• EMC Council Directives: 2014/30/EC

• Low voltage Directives: 2014/35/EC

Warranty

Thytronic warrants devices against defects in materials and workmanship under normal use for a

period of ONE (1) YEAR from the date of retail purchase by the original end-user purchaser (“War-

ranty Period”).

Safety recommendations

The warming contained in this document are all-important for safety; special attention must be paid

to the following symbols:

Installation and commissioning must be carried out by qualiﬁed person; Thytronic assumes no re-

sponsibility for damages caused from improper use that does not comply all warning and caution in

this manual.

In particular the following requirements must be met:

• Remove power before opening it.

• Verify the voltage absence by means suitable instrumentation on relay connections; attention must

be paid to all circuits supplied by external sources (binary input, CT, etc...)

• Care must be taken when handling metal parts.

Insulation tests

After insulation tests, hazardous voltages (capacitor charges,...) may be arise; it is advisable to grad-

ually reduce the test voltage avoiding to erase it abruptly.

DANGER Death, severe personal injury or substantial property damage will result if proper precautions

are not taken

WARNING Death, severe personal injury or substantial property damage can result if proper precautions

are not taken.

CAUTION Minor personal injury or property damage can result if proper precautions are not taken

CAUTION

Settings must be established on the basis of a coordination study.

Numerical values inside examples have educational purpose only; they don’t be used, in no way,

for actual applications.

INTRODUCTION 6

NA20 - Manual - 04 - 2022

Product identiﬁcation

Each device is equipped with:

• Identiﬁcation label installed on the front side with following informations: code number, phase and

residual nominal currents, auxiliary voltage range and CE mark:

• Test label with following informations: data, serial number and test operator signature.

Environment

The NA20 device must be employed according to the environment conditions shown (see technical

data).

In case of different environment conditions, appropriate provisions must be provided (conditioning

system, humidity control, etc...).

If contaminants are present (dust, corrosive substances, etc...), filters must be provided.

Graphical conventions

The CEI/IEC and ANSI symbols is employed where possible:

e.g.: 51 = ANSI code concerning the overcurrent element.

Following text formats are used:

The ThyVisor[1] menu:

Phase overcurrent -50/51

The parameter description (measures, thresholds, operate time,...) and related value:

I> element

    Denitetime

I>def

The display messages (MMI) are shown as:

NA20

Notes are highlighted with cursive letters inside colored bar

Note: Useful description note

Glossary/deﬁnitions

En Relay residual nominal current

Enp Residual CT primary nominal current

nRelay phase nominal current

np Phase CT primary nominal current

BBasic current: it represents the nominal current of the line or trans-

former, referred to the nominal current of the CT’s for thermal image

protection

37 Undercurrent ANSI code

46 Negative sequence overcurrent ANSI code

49 Thermal image ANSI code

50/51 Phase overcurrent ANSI code

50N/51N Residual overcurrent ANSI code

BF Circuit breaker failure ANSI code

74CT CT supervision

74TCS Trip Circuit Supervision

DFR Digital Fault Recorder (Oscillography)

SER Sequential Event Recorder

SFR Sequential Fault Recorder

ANSI American National Standard Institute

IEEE Institute of Electrical and Electronics Engineers

IEC International Electrotechnical Commission

CENELEC Comité Européen de Normalisation Electrotechnique

52 o CB (Circuit Breaker) Circuit Breaker

52a Auxiliary contact in the breaker that is in the same position as the

breaker. It can be assigned to a binary input to locate the CB position

(Breaker failure and/or CB diagnostic functions). (52a open = CB open)

52b Auxiliary contact in the breaker that is in the opposite position as the

breaker (52b open = CB closed)

K1...K6...K10 Output relays

Pulse Output relay with pulse operation

tTR Output relay minimum pulse width

Latched Output relay with latched operation (manual reset) Output relay with

latched operation (automatic reset)

No-latched Output relay with no-latched operation (automatic reset)

CT Current Transformer

P1 IEC nomenclature for primary polarity mark of CTs (as an alternative to

a ANSI dot)

P2 IEC nomenclature for primary polarity mark of CTs (as an alternative to

Note 1 The graphic interface and the operation of the ThyVisor software are described in the relative chapters

INTRODUCTION 7

NA20 - Manual - 04 - 2022

a ANSI no-dot)

S1 IEC nomenclature for secondary polarity mark of CTs (as an alternative

to a ANSI dot)

S2 IEC nomenclature for secondary polarity mark of CTs (as an alternative

to a ANSI no-dot)

Self test Diagnostic

Start Leave an initial condition or reset condition (Pickup)

Trip Operation (with operate time)

Operating time Duration of time interval between the instant when the character-

istic quantity in reset condition is changed, under speciﬁed condi-

tions, and the instant when the relay operates

Dropout ratio The ratio of a reset value to an operate value in well-speciﬁed con-

ditions. The dropout ratio may be lower or greater than 1 according

as an over or under element is considered

Reset time Duration of the time interval between the instant when the charac-

teristic quantity in operate condition is changed, under speciﬁed

conditions, and the instant when the relay operates.

The stated reset time is related to a step variation of characteristic

quantity in operate condition to the reset condition.

Overshoot time The critical impulse time for a relay which is in its reset condition,

is the longest duration a speciﬁed change in the input energizing

quantity(ies) (characteristic quantity), which will cause the relay

to change to operate condition, can be applied without the relay

switches. The overshoot time is the difference from the operate time

and the critical impulse time.

The declared values for the overshoot time are applicable with the

lower setting value of the operation time.

MMI (Man Machine Interface) Operator front panel

ThyVisor Setting and monitoring software

Log ﬁle A text ﬁle that lists actions that have occurred (ThyVisor).

J2SE Java Platform Standard Edition

Subnet Mask (Ethernet nomenclature)

Sw Software

Fw Firmware

Upgrade Firmware upgrade

XML eXtensible Markup Language

INTRODUCTION 8

NA20 - Manual - 04 - 2022

Symbols.ai

Symbols

I>> Start

I>> BF_OUT

IPh Block2

Logic internal signal (output); may be a logical state

(e.g.I>> Start

) or a numerical value

It is available for reading (ThySetter + communication interface)

Logic external signal (intput); may be a command coming from a binary input or a sw command

It is available for reading (ThySetter + communication interface)

Internal signal (e.g. Breaker Failure output state concerning to the 2nd threshold of the 50 element)

It is not available for reading (missing arrow)

AND and NAND logic gates

OR and NOR logic gates

Limit block (I>> threshold).

Computation block (Max phase current)

Threshold setting (e.g. pickup

I>>)

The value is available for reading and is adjustable by means ThySetter + MMI.

Switch

ON delay timer with reset (tON delay)

ON delay timer without reset (tON delay)

OFF delay timer (dropout) without reset (tOFF delay)

Curve type (deﬁnite/inverse time)

IL3

Max[IL1 ,IL2 ,IL3 ]

IL2

IL1

tON tON tON tON

RESET

INPUT

OUTPUT

tOFF

INPUT

OUTPUT

tON tON tON

INPUT

OUTPUT

tON

& &

≥1≥1

EXOR logic gate

tOFF

I >>

II ≥

I>>

tON

RESET

0 T

INTRODUCTION 9

NA20 - Manual - 04 - 2022

Symbols1 .ai

RESET

INPUT

OUTPUT

tOFF

tOFF tOFF

Minimum pulse width operation for output relays (tTR

)

tTR

INPUT

OUTPUT

tTR

0 T

tTR

INPUT

OUTPUT

Latched operating mode for output relays and LEDs

Pulse operating mode for output relays

INPUT

OUTPUT

Latched

tTR

RESET

OFF delay timer (dropout) with reset (tOFF delay)

GENERAL 10

NA20 - Manual - 04 - 2022

2 GENERAL2 GENERAL

Preface

The relay type NA20 is typically used in HV, MV and LV radial networks as feeder or power trans-

former protection.

In solidly grounded systems the residual overcurrent protection can be used on feeders of any length,

while in ungrounded or Petersen coil and/or resistance grounded systems, the residual overcurrent

protection can be used on feeders of small length in order to avoid unwanted trippings due to the

capacitive current contribution of the feeder on external ground fault.

Beside to the phase and residual overcurrent protection, the following protective functions are pro-

vided:

• Thermal image protection of lines and power transformers.

• Undercurrent protection for monitoring of CB opening.

• Negative sequence protection against asymmetrical short circuits and unbalance loads.

• I2/I1protection against phase interruption under low-load condition.

Following input circuits are available:

• Three phase current and one residual current inputs with nominal currents independently select-

able at 1 A or 5 A using dip-switch.

• Two or ﬁve (optional) binary inputs.

• One block input (logic selectivity).

In addition to the main protection element, the breaker failure (BF), CT monitoring (74CT), Trip Circuit

Supervision (TCS) and programmable logic (PLC) are also provided.

Setting, programming and reading operations must be effected by means of Personal Computer with

ThyVisor software or by means of remote communication interface (RS485 bus and Ethernet network

or USB); all operations must be performed through MMI.

According to the hardware conﬁgurations, the NA20 protection relay can be shipped in various case

styles depending on the required mounting options:

• Flush.

• Projecting mounting.

• Rack.

• With separate operator panel.

Other options are:

• Auxiliary power supply operating range.

• Communication protocols.

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