Emco EE301-T Manual de usuario

I INTRODUCTION

EMCO’sSolidStateVoltageRegulatingRelayTypeEE301-Tisusedforregulatingthesecondary

voltage of power transformer with on-load tap changer .The required dead-band settings are set

by setting the Nominal value and L & R levels independently.TheTime Delay setting on the front

panel eliminates the relay operations for momentary fluctuations of the regulated voltage, thus

reducing the number of operations of the tap changer.

When the regulated voltage falls below the specified Under Voltage limit, the control relays are

automatically blocked i.e. there is no voltage correction, and a pair of relay contacts is made

availableforalarm.

When the regulated voltage goes above the specified Over Voltage limit, the control relays are

automatically blocked i.e. there is no voltage correction, and the same pair of relay contacts (for

UV)ismade available for alarm.

A built-inTap Position Indicator with 1KWstep resistance can be provided optionally to indicate

theTap No.of the PowerTransformer upto a maximum of 35.

The relay uses all solid state circuitry which increases its reliability and life. The output, input

connectionsaremadethroughaterminalblock. However all normal precautions/care in handling/

storageshould be observed asfor a sensitive electronicinstrument.

II GENERAL DESCRIPTION

EMCO'sSolidStateAutomaticVoltage Regulating RelayTypeEE301-Tisdesigned formaximum

operational simplicity. It regulates the secondary voltage of power transformers with on-load

tapchangers. The bandwidth control allows the dead-band to be set in terms of upper (LOWER

VOLTS)andlower(RAISEVOLTS) voltagelimits around a particular nominal value withspecified

sensitivity.

The Time Delay control allows the regulator to respond only to voltage fluctuations lasting for

periodsgreaterthan the selected time delay.Where the voltagecorrectionrequiresmorethanone

tap change, the time delay is re-initiated before further tap changes. No special provisions are

requiredtoresetthetimedelaywhich resets automatically after the voltage correction. SolidState

Lamps (LEDs) indicate voltage outside the preset limits and control relay operations.

Operation of the RAISE / LOWER Control Relay is automatically inhibited when the voltage falls

below the specified undervoltage limit or goes above the Overvoltage limit. One pair of normally

open relay contacts are provided to effect the tapchanger RAISE and LOWER operations and to

trigger an alarm in case of Undervoltage / Overvoltage conditions. (Only one pair of contacts is

availableforeitherUV or OV)

Analarmintheformofnormallyopencontactsis providedincaseof control failurei.e.AVR Relay

continuouslyshowingeither'L' or 'R' command formorethan 15 minutes due tomalfunctioningof

AVR/OLTC/ anyreason.

A built-inTap Position Indicator with 1KWstep resistance can be provided optionally to indicate

theTap No.of the PowerTransformer upto a maximum of 35.

III SPECIFICATIONS

Auxiliary Supply.................... 110V/230V AC + 15% 50Hz, 15VA

PT Supply ........................... 110V AC 50Hz, 1.5VA and readable on display

NominalValue Setting (NVA).... Adjustable between 110V + 10% & readable on display

LOWER Volts Setting............. Adjustable between 0.5V to 5V above

the NVA and readable on display

RAISE Volts setting................ Adjustable between 0.5V to 5V below the

NVA and readable on display

Time Delay Setting................... Fixed(VoltageIndependent)Time

Delay adjustable from 10 to 120 Secs

Time Delay Resetting.............. Instantaneousresettingwithvoltage

returningtodeadband

Undervoltage Blocking............. Internal blocking at 80% of regulated value.

Restorationat85% of regulated value

Overvoltage Blocking.............. Internal Blocking at 132V & Restoration at 127V

Control Relays........................ One pair of normally open potential free contacts of

rating 5A at 240V AC or 24V DC resistive load for each

Lower, Raise, Control Fail & Undervoltage / Overvoltage

control relays (Only one pair of contacts is available for

either UV or OV)

Control Operation.................... Single Pulse operation with approx. 2 secs on time

OperatingTemperature............. 0°C-45°C

Overall Size........................... 378mmX 160mm X 260mm (HX W X D)

Weight.................................... 5 Kgs. (approx.)

Options.................................. 1. TapPositionIndicator,Max.35Taps with 1KWresistance

2. Line drop compensator with resistive and reactive

compensation of either polarity upto 20% and

suitable for operation with 1A, 5VA current

transformer

3. Normally closed Auxiliary Supply Fail Relay Contacts

4. User defined settings for PT Supply, Time Delay,

Undervoltage & Overvoltage Blocking. User specified

step resistance for TPI

5. 4-20 mA TPI output for SCADA

IV. FAMILIARIZATION WITH VARIOUS INDICATIONS / CONTROLS :

A. INDICATIONS

1.4x7 Segment Display (AVR) : Display lights when Auxiliary Supply is 'ON'.

2. 2x7 Segment Display (TPI) : Display lights when Auxiliary Supply is 'ON'.

3.‘L’Lamp : ‘ON’ whenever the PT voltage exceeds the 'LOWER

VOLTS’ set limit.

4. ‘R’ Lamp : ‘ON’wheneverthePTvoltage falls below the ‘RAISE

VOLTS’ set limit.

5. UV / OV Lamp : 'ON’ whenever the PT voltage falls below the factory

set Undervoltage limit i.e. below 80% of the Nominal

voltage. This lamp will turn-off only when the PT

voltageraisesabove85%oftheNominalvoltagevalue.

This lamp will also be ‘ON’, when the PT voltage goes

above the factory set Overvoltagelimit i.e.above132V.

This lamp will turn-off only when the PT voltage falls

below127V.

6. 'LR' Lamp : 'ON'whenLowerRelayis energised.

7. ‘RR’ Lamp : ‘ON’when Raise Relay is energised.

8. 'CF' Lamp : 'ON'whenControlFailRelayisenergised,i.e.whenthe

PTvoltageremainsoutside the bandwidthformorethan

15 minutes.

9.‘TEST’ Lamp : ‘ON’when AVR is in “TEST”mode.

B. CONTROLS

1. Power - ON : This is a toggle switch which when’ON’ supplies

Auxiliary Voltage to the instrument.

2. 'R’ Set : This is a variable control varying from 0.5V to 5.0V below

NVA setting.This control sets the (lower limit of the PT

voltage below which if the voltage reduces, then

corrective action will be taken by the instrument. The

setting is to be read on display.

3. 'NOM’ Set : This is a variable control to set the Nominal value of

PT voltage varying between + 10% of 110V. This set

ting becomes the reference level around which L & R

setting can be varied. The setting is to be read on the

display.

4. 'L’ Set : This is variable control, varying from 0.5V to 5.0V

above NVA setting.This control sets the upper limit of

the PT voltage beyond which if the voltage rises,

corrective action will be taken by the instrument.

The setting is to be read on display.

5.Time Delay : Corrective action takes place only after the Time

Delay as set by this control has elapsed and the

PTVoltagecontinues to remain outside the set

Lower or Raise limits (but does not fall below the

UV / OV limit).

6.Test/Normal Switch for AVR : It selects theTest or Normalmodeofoperation.In

theTest mode, PTVoltage is simulated internally

& can be varied through the Test Control on the

front panel. An LED indication is provided to

indicatethat the instrumentis inTest mode.In the

Test mode, the control relays are “cut off” so that

undesired operation of OLTC is prevented during

testing.Thevoltageis monitored on the displayin

PT I/P position. In the Normal mode external PT

voltage gets connected to the instrument.

Thisswitch must be kept in ‘’Normal” mode when

the instrument is in use.

7.Test Voltage Control : Simulates PT I/P inTest mode and can be varied

from 0V to 150V AC.

8.Test / Normal Switch for TPI : In the Test mode, display indicates "88" for

checking the display. In Normal mode it displays

the actual tap no. of OLTC.This switch must be

kept in "Normal" mode.

9. Selector Switch : Selectsthevoltagesetting to be monitored onthe

display. It also enables the PT voltage to be read

on the display.

NOTE : Before connecting Aux. Supply & PT Supply to the AVR Relay, Check-up

following points.

A) Mechanical Damage : Remove the front acrylic cover by removing the

thumbscrews & check for any mechanical damage to the unit.

B) Aux fuse & PT fuse (on Rear Panel) : Note that Aux. fuse is 300mA (20mm)

& PT fuse is 100mA (20mm). Do not interchange these fuses. Check them &

replacewithgood ones if required.

V. OPERATING INSTRUCTION :

1. Check the PT & Auxiliary fuses.

2. Connect 110V / 230V A.C.Aux.Supply to pins 1 & 2 of the Rear PanelTerminal

Block.

3. Connect PT Supply to pins 3 & 4 of the Rear PanelTerminal Block.

4. Turn on the instrument by putting Power Switch to 'ON' position.

5. Leave the unit on for 15 minutes before making any settings.

6. Check theTest / Normal Switch is in the Normal mode.

7. Make the following settings by changing selector switch.

NOMINALVALUE 110V

LOWER VOLTS Setting 112V

RAISE VOLTS Setting 108V

TIME-DELAYSetting 30 Sec.

%R & %X Setting ‘0’ %

(in case of relay with LDC)

8. Keep the selector switch to PT I/P position.

9. Increasethe PT voltageto read PT= 110V

10. Note that under this condition all the lamps viz. L, R, LR, RR & UV/OV are off.

11.LOWERVOLTS OPERATION CHECK :

Increase the PT Supply above 112V (atleast 112.5V), but ensure that it is below

OV limit (132V). 'L' lamp should immediately turn on.

The'LR' control pulse will come only after30 secs. fromthe instant ofturning on

of 'L' lamp. The control pulse will remain 'ON' for 2 secs, after which the Time

Delayof 30 secs. willrestart & the controlpulse will come again for 2 secs.& the

cycle is repeated. Check the LR contacts on pins 9-10 of the Rear Panel

Terminal Block.

12.RAISEVOLTS OPERATION CHECK :

DecreasethePTSupplybelow 108V (atleast 107.5V), but ensurethatitis above

UV limit (88V). 'R' lamp should immediately turn on.

The'RR'control pulse will comeonly after 30 secs.from the instant ofturningon

of 'R' lamp. The control pulse will remain 'ON' for 2 secs, after which the Time

Delayof 30 secs. will restart & thecontrol pulse willcome again for2 secs. & the

cycle is repeated. Check the RR contacts on pins 11-12 of the Rear Panel

Terminal Block.

NOTE: Please note that for the operational safety, RAISE and LOWER relays are

interlocked and hence OLTC will never receive two opposite commands

simultaneously.

13.UNDERVOLTAGE OPERATION CHECK :

Reduce PT Supply below 88V (atleast 87.5V) (UV is factory set at 80% of the

Nominalvoltage),UV/OVlamp will turn-onimmediatelly.(Under this condition R

lamp will also be on) but the Raise control is inhibited. Note that between

Blocking&Release (Restoration), a hysteresis of5% has been provided. Check

the UV contacts on pins 13 & 14 of the Rear Panel Teminal Block.

Raise the PT Supply above 94V, UV/OV lamp should turn off immediately.

'R'lamp indication however shall remain on, if the PT voltage is still below the

Raise setting.The raise control pulse comes on after the set time delay.

Disconnect external PT supply the UV/OV & Rlamp will turn on immediatelly.

TheUV/OV relaywilloperate.Afterrestoration of PT supply,thelampwillturn'off'

& UV/OV relay will be deenergised.

NOTE: Blocking(80%)&Restoration(85%) are factory setvalues,unless the customer

hasspecifiedothervalues.

14.OVERVOLTAGE OPERATION CHECK :

Increase PT Supply above 132V (atleast 132.5V), UV/OV lamp will turn-on

immediatelly.(Underthis condition L lamp willalsobe on) buttheLowercontrolis

inhibited. Note that between Blocking & Release (Restoration), a hysteresis of

5V has been provided. Check the UV/OV contacts on pins 13 & 14 of the Rear

Panel Teminal Block.

Decrease the PT Supply below 127V, UV/OV lamp should turn off immediatelly.

'L' lamp indication however shall remain on, if the PT voltage is still above the

Lower setting.The lower control pulse comes on after the set time delay.

NOTE: Blocking (132V) & Restoration (127V) are factory set values, unless the

customerhas specified other values.

15.CONTROL FAIL ALARM RELAY :

ChangethePTvoltagetogeteitherRorLindication.Keepthe regulated voltage

outsidethesetdeadband.After15minutes(approx.).thecontrolfailalarmrelay

will operate and will remain in energised condition till the voltage returns to set

deadband.This operation will beindicated by red LED marked CF mounted on

front panel of AVR Relay.The relay contacts can bechecked on Pins 15 & 16 of

the Terminal Block.

Take the regulated voltage within set dead band.The control fail Relay will get

deenergised and the contacts on Pins 15 & 16 will open and CF LED

will stop glowing. Similarly this operation can be checked by taking regulated

voltageon other sideof set deadband

16. TEST MODE :

When the 'Test / Normal' switch is put in the 'TEST' mode, the PT I/P can be

simulated through the 'TEST Control'. However to prevent any undesirable

operation of the OLTC, the relays are cut off, but the lamp indications are

available.

17. TIME DELAY :

This is a variable control with variation from 10 sec. to 120 sec. The actual

setting can be made as required. The corrective action will take place only after

the set Time Delay interval is elapsed provided the voltage deviation persists

evenafterthesetTimeDelayandthattherelayisnotoperatinginUV / OV mode.

18. CONTROLRELAYS :

Connect the respective Lower, Raise, Control Fail and Under / Over voltage NO

contacts to operate the respective contactors / Alarms.

19. TPIOPERATION CHECK :

Keep the Test/Normal Switch of TPI in Normal mode & connect Min., Max. &

WiperfromOLTC to the Rear PanelTerminalBlock.Changethetappositionfrom

1 to maximum tap and check whether TPI reads correctly.

Keep the TPI "Test/Normal" switch in "Test" mode & check whether

display reads "88".

FUSE REPLACEMENT:

1 After switching power-on, the display indication must come. If it does not come,

check whether AUX. fuse on the rear panel is properly tightened. If the

instrument still does not work, unscrew the fuse & check if it is open. Replace

it by another fuse of 300mA (20mm).

Once again ensure that the fuse is not loose. The instrument should turn on

now. If the fuse keeps on blowing repeatedly or the instrument does not work

inspite of good fuse, proceed to identify the faulty PCB as given in fault finding

procedureVII.

2 Connect the PT supply and put the Test/Normal switch in Norrnal position. If

the Instrument is turning on but you are continuously getting 'R’ and ’UV’

indication, check whether PT fuse is loose. If the condition persists even after

tightening PT fuse, remove the same and replace by another 100mA (20mm)

fuse. If ‘UV’ and ‘R’ indication still persist, proceed to identify the faulty PCB as

giveninfault-findingprocedureVIII.

VI.FUNCTlONAL DESCRIPTlON OFVARlOUS MODULES :

1. MainsTransformer : This trasnformer is mounted on a plate towards the Rear

Panel . This takes 230V/110V A.C. and steps it down to 16V, 10V & 5V A.C.

voltages required forgeneratingdcpower.

2. P.T.Transformer : This is also mounted on the plate towards the Rear Panel &

steps down PT input from 110V AC to 3.3V AC. which is used for sensing

PTvoltage.

3. Main PCB : This module generates ±12V DC, +5V DC required for circuit

operation. Three pin regulator ICs 7812, 7912, 7805 are used to

give regulated +12V, -12V & + 5V D.C. Supplies. The PT input is stepped

down in the ratio 110/3.3. This stepped down voltage is rectified, filtered and

amplified by IC10. This voltage is used for comparison with reference voltage

settings (on Display PCB). L, R, UV/OV signals are received from Display PCB.

OnreceivinganyofLorRsignals,IC5generatesTimeDelayfollowed by LR and

RR commands generated by IC4 for energizing appropriate relay. The NO

contacts are brought out on the Rear Panel Terminal Block. In case of UV/OV

condition,the relays are blocked and no control pulses are available. The IC8 is

used to convert the analog voltage to digital voltage and display the same on 7

segment display on Display PCB.

4. Display PCB : R set, Nom set, L set potentiometers allow the required settings

to be set. The L, R, UV, OV settings are compared with the DC output by IC3

and the L, R, UV/OV LEDs indicate these conditions. Selector switch selects

theNominalValue L and Rsettings and PT I/Pto be displayed onthe 7 segment

display. LR, RR LEDs indicate the relay operation condition.Time Delay

potentiometer allows the required time delay to be set.

5. IC1 generates 15 minutes delay for CFR condition which is indicated by CFR

LED.

6. When LDC option is required %R & %X potentiometers allow for %R & %X

compensation. SW3 & SW4 allow for polarity selection. IC7 sums the PT I/P &

LDC O/P.

7. TPI PCB : This PCB generates constant current which is used for generating

100mV per step. The IC2 is used to convert analog voltage to digital voltage &

display the same on 7 segment display.

VII. FAULT FINDING procedure :

Step-1 : Check for any physical damage by opening front panels.

Step-2 : Check the Aux.fuse (300mA) & PT fuse (100mA).If necessary, replace

them.(Do not interchange the fuses).Tighten them properly.

Step-3 : Confirmthat the Display PCB's 40 pin connector mate properly with the

Main PCB's 40 pin connector

Step-4 : Connect 'Aux’ supply & PT supply & Switch ON the unit. If the unit does

not get switched ON, then check Power ON switch.

Step-5 : Measure DC voltages on TP5, TP6 & TP4 w.r.t.TP3. They should be

+12V, -12V & +5V respectively. If the voltages are not correct,

remove 40 pin connector and check once again. If the voltages are

correct then there is problem with the Display PCB. Replace the

Display PCB. If the voltages are still not OK, check the mains

transformer. Replace the mains transformer if faulty or else replace

MainPCB.Confirm all DC voltagesare OK.

Step-6 : Keeptheselectorswitchto'N'setpositionandvary'N'setcontrolto read

99V to 121V on display. Set 'N set' control to 110V. Keep the selector

switchto'R'setpositionandvary'R'setcontroltoread104.5Vto109.5V

on display. Set 'R set' control to 108V. Set selector switch to 'L' set

positionand vary 'L' set control to read110.5V to 115.5V on display.Set

'Lset' control to112V. Ifany of the settings are not obtainable, it means

Display PCB is faulty. Check potentiometers for their open/short

conditions&replaceif necessary. If not,IC6or IC4 or selector switch on

Display PCB may be faulty. Replace the faulty component.

Step-7 : Put selector switch to PT I/P position. Vary the PT/IP and read the

display. If display does not vary then measure AC Voltage at TP4 on

Display PCB w.r.t. GND. It should vary from 0 to 5V AC, when PT/IP is

varied from 0 to 150V AC. If the voltage is not coming, it means that the

sensetransformerisfaulty. Replace the sense transformer.Ifthevoltage

is OK, check on Main PCB 7.5V DC on TP9 for PT I/P = 110V. If DC

voltage is not OK then IC10 is faulty. If it is OK then either selector

switch on Display PCB is faulty or IC8 on Main PCB is faulty. Replace

thefaulty component.

Step-8 : Vary the PT I/P to less than 80V (UV level), then the UV indication

alongwith ‘R’ indication should come. Increase the voltage above

85V then UV command goes “off”. However ‘R’ command remains

“ON”. Increase PT I/P voltage slightly more than 108V, ‘R’ will go

off. This is Bandwidth condition. Increase PT I/P slightly more than

112V, ‘L’ indication should come.

Step-9 : Vary the PT I/P to more than 132V (OV level), then the OV indication

alongwith ‘L’ indication should come. Decrease the voltage below

127V then OV command goes “off”. However ‘L’ command remains

“ON”. Decrease PT I/P voltage slightly less than 112V, ‘L’ will go

off. This is Bandwidth condition. Decrease PT I/P slightly less than

108V, ‘R’ indication should come. If the UV/OV, L & R indications are

coming as above that means Display PCB is OK.

Step-10 : Set Time Delay (TD) control to 30 sec. Vary the PT I/P to get ‘L’

condition. Measure time from which ‘L’ indication comes to the time

‘LR’ indication comes. The ‘LR’ indication will remain ‘ON’ for 2 sec.

after which once again ‘TD’ is initiated. (The ‘TD’ indication is

provided on Main PCB). If time delay is not ok, it means Main

PCB or TD pot is faulty. Replace the faulty component. If ‘LR’ & ‘RR’

indications are not coming after set time delay then IC4 on Main PCB is

faulty.

(In above description, it is assumed that display & LEDs are OK).

Step 11 : To check relay, vary PT I/P to get ’L & R’ conditions in Normal mode &

confirm that Lower relay and Raise relay are operating, by checking

continuity at rear terminals. If “RR” & “LR” indication are coming but

relaysare not operating thencheck 12V supply torelay on Main PCB or

checkTest / Normal switch S2.If relays are operating but 'NO’contacts

are not closing means relay contacts are faulty. Ensure that Relay

contacts are not connected to theTap-Changer.Replace Main PCB.

Step-12 : To check TPI PCB, connect Resistor chain between Max. & Min. &

wiper to Common. Measure approx. +1V on the IC2 pin 36 with DMM.

Adjust pot P5 to get +1V. Measure the step voltage across individual

resistor. It should be 100 ± 3mV. If not then adjust pot P2 to get 100 ±

3mV. If the voltage does not come then IC3 may be faulty. If the voltage

is OK but still the display does not read properly, then IC2 on the TPI

PCB may be faulty. Check TPI displays 88 in "Test" mode. If not then

"Test / Normal" switch is faulty.

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