MICROENER MG30 Manuale utente

MG30

Doc. N° MO-0084-ING

Rev. 1

Date 28.04.2003

Firmware:

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MULTIFUNCTION GENERATOR

PROTECTION RELAY

TYPE

MG30

OPERATION MANUAL

MULTIFUNCTION

GENERATOR

PROTECTION

RELAY TYPE

MG30

ENTER/RESET

MODE

SELECT

PROG.

I2>,T>

Zc<,>

PROG/

I.R.F.

MICROELETTRICA SCIENTIFICA

MILANO ITALY

I>,Z<,Uo>

U,f

W<,Ir>

60FL

B.I./

B.F.

MG30

Doc. N° MO-0084-ING

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INDEX

1 General utilization and commissioning directions __________________________________________4

1.1 Storage and transportation__________________________________________________________ 4

1.2 Installation_______________________________________________________________________ 4

1.3 Electrical connection_______________________________________________________________ 4

1.4 Measuring inputs and power supply___________________________________________________ 4

1.5 Outputs loading___________________________________________________________________ 4

1.6 Protection earthing_________________________________________________________________4

1.7 Setting and calibration______________________________________________________________ 4

1.8 Safety protection__________________________________________________________________ 4

1.9 Handling_________________________________________________________________________4

1.10 Maintenance_____________________________________________________________________ 5

1.11 Fault detection and repair___________________________________________________________ 5

2 General characteristics and operation____________________________________________________ 5

2.1 Power supply_____________________________________________________________________ 5

2.2 Measuring input___________________________________________________________________ 6

2.3 Algorithms of the different functions___________________________________________________ 7

2.3.1 Setting range of the reference input quantities______________________________________ 7

2.3.2 F50/51 Dual level 3-phase overcurrent with or without________________________________ 7

2.3.3 Voltage controlled overcurrent___________________________________________________8

2.3.4 F46 Current unbalance________________________________________________________ 9

2.3.5 F32 Reverse Power___________________________________________________________9

2.3.6 F40 Loss of excitation: capacitive underimpedance Zc<_______________________________10

2.3.7 F27-59 Dual level 3-phase over/under voltage______________________________________ 11

2.3.8 F81 Dual level over/under frequency______________________________________________12

2.3.9 F49 Thermal overload_________________________________________________________ 13

2.3.10 F37 Underpower W<__________________________________________________________ 13

2.3.11 F21 Dual level under impedance_________________________________________________14

2.3.12 F24 Dual level overfluxing______________________________________________________ 14

2.3.13 F64S 95% Stator earth fault element_____________________________________________ 15

2.3.14 F64S 95% Stator earth fault element _____________________________________________ 15

2.3.15 F60FL PT Fuse Failure________________________________________________________ 16

2.3.16 F50/27 Inadvertent generator energization_________________________________________ 16

2.3.17 F50BF Breaker failure protection___ _____________________________________________ 16

2.4 Clock and Calendar________________________________________________________________ 17

2.4.1 Clock synchronization__________________________________________________________ 17

2.4.2 Date and time setting__________________________________________________________ 17

2.4.3 Time resolution_______________________________________________________________ 17

2.4.4 Operation during power off______________________________________________________ 17

2.4.5 Time tolerance_______________________________________________________________ 17

3 Controls and measurements____________________________________________________________ 18

4 Signalization_________________________________________________________________________ 19

5 Output relays_________________________________________________________________________20

6 Serial communication__________________________________________________________________21

7 Digital inputs_________________________________________________________________________22

8 Test________________________________________________________________________________ 22

9 Keyboard and display operation_________________________________________________________ 23

10 Reading of measurements and recorded parameters________________________________________24

10.1 ACT. MEAS (Actual measure)___________________________________________________ 24

10.2 MAX VAL (Max values)_______________________________________________________24

10.3 LASTTRIP (Last trip)_________________________________________________________ 25

10.4 TRIP NUM (Trip number)______________________________________________________ 26

11 Reading of programmed settings and relay’s configuration__________________________________ 26

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12 Programming_________________________________________________________________________27

12.1 Programming of functions settings________________________________________________ 27

12.2 Programming the configuration of output relay_______________________________________ 29

13 Manual and automatic test operation_____________________________________________________ 31

13.1 Mode “ TESTPROG “ subprogram “ W/O TRIP “____________________________________ 31

13.2 Mode “ TESTPROG “ subprogram “ With TRIP “____________________________________ 31

14 Maintenance_________________________________________________________________________ 31

16 Power frequency insulation test_________________________________________________________ 31

15 Electrical characteristics_______________________________________________________________ 32

17 Connection diagram (Standard Output)____________________________________________________ 33

17.1 Connection Diagram (Double Output)_________________________________________________33

18 Wiring the serial communication bus_____________________________________________________34

19 Change phase rated input 1A or 5A______________________________________________________ 35

20 Time current curves F51_______________________________________________________________ 35

21 Time current curves F46_______________________________________________________________ 36

22 Thermal image curves_________________________________________________________________ 37

23 Time current curve V/Hz________________________________________________________________38

24 Direction for pcb’s draw-out and plug-in__________________________________________________ 39

24.1 Draw-out____________________________________________________________________ 39

24.2 Plug-in______________________________________________________________________39

25 Overall dimensions____________________________________________________________________40

26 Keyboard operational diagram__________________________________________________________ 41

27 Setting’s form________________________________________________________________________ 42

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Doc. N° MO-0084-ING

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Date 28.04.2003

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1. General utilization and commissioning directions

Always make reference to the specific description of the product and to the Manufacturer's instruction.

Carefully observe the following warnings.

1.1 - STORAGE AND TRANSPORTATION,

must comply with the environmental conditions stated on the product's instruction or by the applicable

IEC standards.

1.2 - INSTALLATION,

must be properly made and in compliance with the operational ambient conditions stated by the

Manufacturer.

1.3 - ELECTRICAL CONNECTION,

must be made strictly according to the wiring diagram supplied with the Product, to its electrical

characteristics and in compliance with the applicable standards particularly with reference to human

safety.

1.4 - MEASURING INPUTS AND POWER SUPPLY,

carefully check that the value of input quantities and power supply voltage are proper and within the

permissible variation limits.

1.5 - OUTPUTS LOADING,

must be compatible with their declared performance.

1.6 - PROTECTION EARTHING

When earthing is required, carefully check its efficiency.

1.7 - SETTING AND CALIBRATION

Carefully check the proper setting of the different functions according to the configuration of the

protected system, the safety regulations and the co-ordination with other equipment.

1.8 - SAFETY PROTECTION

Carefully check that all safety means are correctly mounted, apply proper seals where required and

periodically check their integrity.

1.9 - HANDLING

Notwithstanding the highest practicable protection means used in designing M.S. electronic circuits,

the electronic components and semiconductor devices mounted on the modules can be seriously

damaged by electrostatic voltage discharge which can be experienced when handling the modules.

The damage caused by electrostatic discharge may not be immediately apparent but the design

reliability and the long life of the product will have been reduced. The electronic circuits produced by

M.S. are completely safe from electrostatic discharge (8 KV IEC 255.22.2) when housed in their case;

withdrawing the modules without proper cautions expose them to the risk of damage.

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Doc. N° MO-0084-ING

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a. Before removing a module, ensure that you are at the same electrostatic potential

as the equipment by touching the case.

b. Handle the module by its front-plate, frame, or edges of the printed circuit board.

Avoid touching the electronic components, printed circuit tracks or connectors.

c. Do not pass the module to any person without first ensuring that you are both at

the same electrostatic potential. Shaking hands achieves equipotential.

d. Place the module on an antistatic surface, or on a conducting surface which is at

the same potential as yourself.

e. Store or transport the module in a conductive bag.

More information on safe working procedures for all electronic equipment can be found

in BS5783 and IEC 147-OF.

1.10 - MAINTENANCE

Make reference to the instruction manual of the Manufacturer ; maintenance must be carried-out by

specially trained people and in strict conformity with the safety regulations.

1.11 - FAULT DETECTION AND REPAIR

Internal calibrations and components should not be alterated or replaced.

For repair please ask the Manufacturer or its authorised Dealers.

Misapplication of the above warnings and instruction relieves the Manufacturer of any liability.

2. GENERAL CHARACTERISTICS AND OPERATION

Input signals are supplied to 3 current transformers and 3 potential transformers respectively measuring

phase currents and phase-to-neutral voltages plus one voltage transformer for measurement of zero

sequence voltage. Phase current input can be 1 or 5A (movable jumpers on relay’s card). Rated voltage

input can be programmed from 50 to 125V (phase-to-phase) 50 or 60Hz.

Make electric connection in conformity with the diagram reported on relay's enclosure.

Check that input quantities are same as reported on the diagram and on the test certificate.

The auxiliary power is supplied by a built-in interchangeable module fully isolated an self protected

2.1 - POWER SUPPLY

The relay can be fitted with two different types of power supply module:

24V(-20%) / 110V(+15%) a.c. 80V(-20%) / 220V(+15%) a.c.

a) - b) - 

24V(-20%) / 125V(+20%) d.c. 90V(-20%) / 250V(+20%) d.c.

Before energizing the unit check that supply voltage is within the allowed limits.

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Doc. N° MO-0084-ING

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2.2 - Measuring Inputs

For each phase the relay computes the RMS value of current and voltage and the relevant phase

displacement. It also computes the RMS value of the fundamental and the third harmonic

components of the Zero Sequence Voltage.

2.2.1 Phase currents are supplied to three current transformers with 5A rated primary. By movable

jumpers on the relay card, the secondary can be switched-on to two different taps to obtain a

relay rated input current In = 5 or 1 Amp (different values can be provided on request).

The measuring dynamics of the C.Ts. runs from 0.001 through 50 times In.

For the phase current the measuring range of the A/D Converters runs from 0 to 12In

automatically switched to two channels one measuring from 0 to 1.1In and the second from

0 to 12In.

The resolution of the A/D converter is 12 bits.

2.2.2 Phase-to-neutral voltages are supplied to three Potential transformers rated 220V.

Relay’s rated phase-to-phase input voltage (Un) can be matched with the System’s PTs by

setting their ratio kV

The ADC converter measuring range runs up to 2 x Un.

The A/D converter resolution is 12 bits.

2.2.3 Zero Sequence Voltage is supplied to a dedicated input transformer rated 220V.

Relay’s rated input voltage On is adjustable from 50 to 125V and the measuring range runs from

o to 130V with A/D converter’s resolution of 12 bits.

The relay computes the RMS of fundamental and the third harmonic components of the Zero

Sequence Voltage.

2.2.4 Phase displacement

The relay detects the displacement between the input voltage of phase C and each phase

current IA, IB, IC. The displacement angles are therefore :

A= A-C -120° ; B= B-C + 120° ; C= C-C

This means that the voltage system is considered to be

balanced as it is normally, whereas the currents can be

however unbalanced. (see figure)

Angles are measured anticlockwise from 0° to 360° with

accuracy 2°.

Displacement is not measured if current or voltage are null.

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Doc. N° MO-0084-ING

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2.3 - Algorithms of the different functions

2.3.1 - Setting range of the reference input quantities



System frequency

Fn = (50-60)Hz



Rated primary current of phase C.Ts.

In = (0-9999)A, step 1A



Ratio of System’s PTs.

Kv = (2-655), step 0.1



P.Ts secondary phase-to-phase voltage

Uns = (50-125)V, step 1V



Relay basic current (Generator’s rated current)

Ib = (0.5-1.1)In, step 0.1In



Rated primary current of neutral CT

On = (50-125)On, step 1V

2.3.2 - F50/51 - Dual level 3-phase overcurrent with or without voltage control

1F 50/51 : Low set overcurrent

Voltage control activated / non activated

I>/U = ON-OFF

Pick-up (operation) level

I> = (1-2.5)Ib, step 0.01Ib

Setting I> = Dis blocks function’s operation

Drop-out ratio

0.95

Minimum operation time of instantaneous output

30ms

Trip time delay in the definite time operation

mode F(I>) = D

t = tI> = (0.05-30)s, step 0.01s

- Trip time delay in the inverse time operation mode F(I>) = SI :

1)(I/I tI0.033

t0.02 





; (tI> = trip time delay at I/Ib = 5)

(see curves TU0311 §19)

2F 50/51 : High set overcurrent

Voltage control activated / non activated

I>>/U = ON-OFF

Pick-up (operation) level

I>> = (1-9.9)Ib, step 0.1Ib

Setting I>> = Dis blocks function’s operation

Drop-out ratio

0.95

Minimum operation time

30ms

Independent trip time delay

t = tI>> = (0.05-3)s, step 0.01s

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2.3.3 - Voltage controlled overcurrent

If the parameters I>/U and/or I>>/U are set to “ON” the voltage control is active respectively for the

level I> and/or I>>. The actual pick-up levels (I>,I>>) vary from the programmed levels ([I>] , [I>>])

proportionally to the voltage variation according to the curve herebelow

The voltage ratio is measured on each phase and the smallest among the values is used

in the algorithm.

Practically when the input voltage drops below 0.8 [Un] the minimum pick-up level of the overcurrent

elements is decreased as follow

Below 0.2 [Un]

Above 0.8 [Un]

level]up-pick[Set levelup-pickActual

][I

I





voltage]input[Rated voltageActual

[Un]

U













[Un]3Ex

     

10.8

0.6

0.8

I



















   

0.2

I







   

I







MG30

Doc. N° MO-0084-ING

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2.3.4 - F46 - Current unbalance : Measurement of RMS Negative Sequence Current I2

1F 46 : I22 t = K (adiabatic heating)

- Generator’s continuous I2rating : 1Is = (0.05-0.5)Ib, step 0.01Ib

Setting 1Is = Dis blocks function’s operation

- Time multiplier : Ks = (5-80)s, step 1s ; Ks = Trip time when I2= Ib

- Trip time delay

tKs

(I / I )

h2 b 2



; Heat accumulation only operates if I2 [1Is]

- Cooling time from trip level to the state corresponding to the continuous operation at I2 = [1Is] :

tcs = (10-1800)s, step 1s

Cooling time

t[tcs]

Ks I











; t1= [tcs] when

ItKs









 

Cooling only takes places if

I1Is



(see curves TU0312 §20)

2F 46 : Unbalance Alarm

Alarm level

2Is = (0.03-0.5)Ib, step 0.01Ib

Setting 2Is = Dis blocks function’s operation

Independent trip time delay

t2Is = (1-100)s, step 1s

2.3.5 - F32 - Reverse power

Current setting range

Ir = (0.02-0.2)Ib, step 0.01Ib

Setting Ir = Dis blocks function’s operation

Operation level

I [Ir]

Independent trip time delay

tIr = (0.1-60)s, step 0.01s (0.1 to 0.99),

step 0.1s (1.0 to 60)

Operation zone

90°<c<270°

I2/Ib

[1Is]/Ib

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2.3.6 - F40 - Loss of excitation : capacitive underimpedance Zc<

- For each phase the relay computes the impedance

Zc E

Icos( 90 )

x x

 



- Characteristics angle of the impedance Z= 270°

N.B. By definition the relation between current displacement and impedance displacement 

is : = 360°- 

Angles are counted anticlockwise from 0° (real axis = direction of phase-to-neutral

voltage E) through 360°.

For example : the displacement of a totally capacitive current is = 90°;

the angle of a totally capacitive impedance is = 270°.

- Operation zone is that included in the circle having (see figure) :

Center on the axis Jx at distance from the axes origin and Diameter= K1

- Circle offset : K2 = (5-50)%Zb, step 1%

- Circle diameter : K1 = (50-300)%Zb, step 1%

Setting K1 = Dis blocks the function operation

- rated generator’s impedance :

[Ib]3

[Un]

Zb 

- Independent trip time delay : tz = (0.2-60)s, step 0.1s

- Integration time : ti = (0-10)s, step 0.1s

In case of impedance oscillation,reset of the timer tz only takes place if Z remains outside the trip

area for at least [ti].

- Undervoltage inhibition level : Ex < 0.3

[Un]

- Undercurrent inhibition level : Ix < 0.2 [In]

- Operation taxes place only if all the 3 impedances of phase A, B, C are within the trip zone

- The following setting are normally used:

K2 1/2 X’d

(X’d = transient direct axis reactance)

K1 + K2 Xd

(Xd = synchronous reactance)



for salient-pole alternators and for synchronous motors



1, 2

for turbo alternators

(1s for synch. motors)

1/4tz











 2

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