MICROENER IM3G-VX Manuale utente

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 1 of 36

Mod.710

31/05/00

P. Brasca

D. Ciminaghi

EMISSION

10/03/98

P. Brasca

D. Ciminaghi

REV.

DESCRIPTION

DATE

PREP.

CONTR.

APPR.

MULTIFUNCTION MICROPROCESSOR

PROTECTION RELAY

TYPE

IM3G-VX

OPERATION MANUAL

GENERATOR

PROTECTION

RELAY TYPE

IM3G-V

ENTER/RESET

MODE

SELECT

PROG.

I2>

PROG/

I.R.F.

MICROELETTRICA SCIENTIFICA

MILANO ITALY

I>-I>>

U,f

B.I./

B.F.

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 2 of 36

INDEX

1 General utilization and commissioning directions __________________________________________3

1.1 Storage and transportation__________________________________________________________ 3

1.2 Installation_______________________________________________________________________ 3

1.3 Electrical connection_______________________________________________________________ 3

1.4 Measuring inputs and power supply___________________________________________________ 3

1.5 Outputs loading___________________________________________________________________ 3

1.6 Protection earthing_________________________________________________________________3

1.7 Setting and calibration______________________________________________________________ 3

1.8 Safety protection__________________________________________________________________ 3

1.9 Handling_________________________________________________________________________3

1.10 Maintenance_____________________________________________________________________ 4

1.11 Fault detection and repair___________________________________________________________ 4

2 General characteristics and operation____________________________________________________ 4

2.1 Power supply_____________________________________________________________________ 4

2.2 Measuring input___________________________________________________________________ 5

2.3 Algorithms of the different functions___________________________________________________ 6

3 Controls and measurements____________________________________________________________ 12

4 Signalization_________________________________________________________________________ 13

5 Output relays_________________________________________________________________________14

6 Serial communication__________________________________________________________________15

7 Digital inputs_________________________________________________________________________16

8 Test________________________________________________________________________________ 16

9 Keyboard and display operation_________________________________________________________ 17

10 Reading of measurements and recorded parameters________________________________________18

10.1 ACT. MEAS (Actual measure)___________________________________________________ 18

10.2 MAX VAL (Max values)_______________________________________________________18

10.3 LASTTRIP (Last trip)_________________________________________________________ 19

10.4 TRIP NUM (Trip number)______________________________________________________ 19

11 Reading of programmed settings and relay’s configuration__________________________________ 19

12 Programming_________________________________________________________________________20

12.1 Programming of functions settings________________________________________________ 20

12.2 Programming the configuration of output relay_______________________________________ 22

13 Manual and automatic test operation_____________________________________________________ 23

13.1 Mode “ TESTPROG “ subprogram “ W/O TRIP “_____________________________________ 23

13.2 Mode “ TESTPROG “ subprogram “ With TRIP “_____________________________________ 23

14 Maintenance_________________________________________________________________________ 23

15 Electrical characteristics_______________________________________________________________ 24

16 Connection diagram (Standard Output)____________________________________________________ 25

16.1 Connection Diagram (Double Output)_________________________________________________25

17 Wiring the serial communication bus_____________________________________________________26

18 Change phase rated input 1A or 5A______________________________________________________ 26

19 Time current curves F51_______________________________________________________________ 27

20 I2t = constant element F46______________________________________________________________ 28

21 Thermal Image Curves_________________________________________________________________ 29

22 Direction for pcb’s draw-out and plug-in__________________________________________________ 30

22.1 Draw-out____________________________________________________________________ 30

22.2 Plug-in______________________________________________________________________30

23 Overall dimensions____________________________________________________________________31

24 Keyboard operational diagram__________________________________________________________ 32

25 Setting’s form________________________________________________________________________ 33

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 3 of 36

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 effectiveness.

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 reduced 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.

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 4 of 36

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 altered 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

Input currents are supplied to 3 current transformers and 3 potential transformers respectively

measuring phase currents and phase-to-neutral voltages. Phase current input can be 1 or 5A (movable

jumpers an relay’s card). Rated voltage input can be programmed from 100 to 125V (phase-to-phase)

50 or 60Hz.

Time-current curves, operation algorithms and performances are reported in relay catalogue and in this

manual together with diagrams and dimension drawings.

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.

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 5 of 36

2.2 - Measuring input

The relay computes the RMS value of current and voltage and the relevant phase displacement.

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 13In

automatically switched to two channels one measuring from 0 to 1.3In and the second from 0 to

13In. The theoretical accuracy of the measurement is 0.12%In from 0 to 1.3In and 1.2%In from

1.3 through 13In.

The actual absolute error on each measurement M can be:

- 1 = 0.02 M 0.002 In from 0 to 1.3 In

- 2 = 0.02 M 0.02 In from 1.3 to 13 In

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

phase-to-phase input voltage (Uns) can be adjusted from 100 through 125V.

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

The theoretical accuracy is 0.2%Uns.

The actual absolute error can be :

- v = 0.02 M 0.003 Uns

2.2.3 - Phase displacement

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

current IA, IB, IC. The displacement angle 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, where as 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.

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 6 of 36

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

- Rated secondary phase-to-phase voltage of P.Ts. : Uns = (100-125)V, step 1V

- Relay basic current (Generator’s rated current) : Ib = (0.5-1.1)In, step 0.1In

2.3.2 - F49 - Thermal overload

The relay computes a thermal image of the machine based on the ratio I/[Ib] of the RMS of the

current flowing in each phase to the rated full load current of the generator :

- Warming-up time constant : Tc = (2 - 400)m, step 1m

- Maximum continuous overload : Ic = 1.05Ib (110%Tn)

- Rated full load (I=Ib) temperature rise : Tn

- Overtemperature prealarm level : Ta = (50-110)% Tn, step 1%

- Current corresponding to machine’s temperature before the overload : Ip (Tp)

- Time to warm-up from Tp to trip temperature (110%Tn) in function of the current overload

(Ib/[Ib])(I/[Ib]) (Ip/[Ib])(I/[Ib])

[Tc]ln

(Tb/Tn)(Tx/Tn) (Tp/Tn)(Tx/Tn)

[Tc]lnt 









(see curves TU0325 §20)

Cooling is computed with the same time constant (Tc) as heating.

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 7 of 36

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

F1 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 :

t0.033 tI

(I / I ) 1

0.02

 

 

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

(see curves TU0311 §18)

F2 50/51 : High set overcurrent

- Voltage control activated / non activated : I>>/U = ON-OFF

- Pick-up (operation) level : I>> = (1-12)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

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 8 of 36

2.3.4 - Voltage controlled overcurrent

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

for the level I> and/or I>>. The actual pick-up levels (I>,I>>) variate in respect to the programmed

levels ([I>] , [I>>]) proportionally to variation of the voltage according to the curve herbelow

[I ],I

[I ]Actual pick - up level

[Set pick- up level]





 

[Uns] Actual voltage

[Rated input voltage]



The voltage ratio is measured on each phase

Ex 3

[Uns]













and the smallest among the values is

used in the algorithm. Practically in the zone between 0.2 and 0.8 Uns, the relay operates as

underimpedance protection when

Zx Ex

Ix [Uns]

3[I ],[Uns]

3[I ]

  

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

F1 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 status corresponding to the operation at I2=[1Is] :

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

Cooling time

t[tcs]

Ks I











; tl= [tcs] when

ItKs









 

Cooling only takes places if

I1Is



(see curves TU0312 §19)

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 9 of 36

F2 46 : Unbalance Alarm

- Alarm level : 2Is = (0.03-1)Ib, step 0.01Ib

- Setting 2Is = Dis blocks function’s operation

- Independent trip time delay : t2Is = (1-100)s, step 1s

2.3.6 - F32 - Reverse active power

- Active current (I cos ) setting range : Ir = (0.02-0.2)Ib, step 0.01Ib

Setting Ir = Dis blocks function’s operation

- Operation level : Ic cos (c-180°) [Ir]

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

- Operation zone : 90°<c<270°

2.3.7 - F37 - Underpower W<

The element measures the 3-phase active power and trips when the power generated (forward)

drops below the set level [W<]

- Pick-up (operation) level : W<= (0.05-1.00)Wb, step 0.05Wb

Setting W< = Dis blocks function’s operation

- Independent trip time delay : tW< = (0.1-60)s, step 0.1s

2.3.8 - 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 axle displaced by Zat distance from the axles’ origin and

Diameter = K1

K2

IM3G-VX

Doc. N° MO-0068-ING

Rev. 1

Pag. 10 of 36

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

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

Setting K1 = Dis blocks the function’s operation

- rated generator’s impedance :

[Ib]3

[Uns]

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

[Uns]

- Undercurrent inhibition level : Ix<0.2[Ib]

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

2.3.11 - F27-59 : Dual level 3-phase over-under voltage

F1 27-59 : First voltage element 1U

- Pick-up (operation) level of voltage difference : 1u = (5-50)%Un, step 1%

- Independent trip time delay : t1u = (0.1-60)s, step 0.1s

- Operation mode : (Un +/-1u)

The function can be programmed to operate as :

- Overvoltage (Un +1u) : operates when any phase voltage Exrises above the rated value

by more than [1u]%.

[1u])%(100100

[Uns]

Ex3



- Undervoltage (Un -1u) : operates when any phase voltage Exdrops below the rated value

by more than [1u]%.

[1u])%(100100

[Uns]

Ex3



-Voltage balance (Un +/-1u) : operates when any phase voltage differs from the rated value

more then [1u]%

[1u])%(100100

[Uns]

Ex3



[1u])%(100100

[Uns]

Ex3



- Operation blocked : (Un = Dis)

[Uns]

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