Automatic Voltage Regulating Relay EE 301 - T …

1 (ISO 9002 COMPANY)AutomaticVoltage RegulatingRelayEE 301 - TINSTRUCTION MANUALI nstruction ManualforAutomaticVoltage Regulating RelayType EE 301-TDOC No. : MK 05 - 702 / ISS. 1 EMCO ELECTRONICSW orksUnit No. 13, "Kedarnath", Tungareshwar Industrial Complex No. 1, Village sativali,Vasai(E), Dist : Thane - 401208. Tel.:(0250)2481783 / 1804, Fax : (0250)2481087,Email : mumbai@emcoelectronics .orgOffice302,Vasan Udyog Bhavan, Sanapati Bapapat marg, OPP. Phoenix mill / BIG BAZAARL ower Parel (W), Mumbai - 400 013. Tel.:(0250)2481783 / 1804, Fax : (0250)2481087E-mail : Wood Street, (1st Floor),Richmond Road, Bangalore - 560 025 OfficeTel : (080) 557 0215 Fax : +91-80-556 6606E-mail : DESCRIPTION1 IIISPECIFICATIONS2 IVFAMILIARIZATION WITH INDICATIONS / CONTROLS3 VOPERATION INSTRUCTIONS5 VIFUNCTIONAL DESCRIPTION OF VARIOUS MODULES8 VIIFAULT FINDING PROCEDURE9 VIIIOPTION13 IXLIST OF DRAWING & RECOMMENDED SPARES17 XWARRANTY18 XIFAULT REPORT FORM19 IINTRODUCTIONEMCO s Solid State Voltage Regulating Relay Type EE 301- T is used for Regulating the secondaryvoltage of power transformer with on-load tap changer.

2 The required dead-band settings are setby setting the Nominal value and L & R levels independently. The Time Delay setting on the frontpanel eliminates the Relay operations for momentary fluctuations of the regulated Voltage , thusreducing the number of operations of the tap the regulated Voltage falls below the specified Under Voltage limit, the control relays areautomatically blocked there is no Voltage correction, and a pair of Relay contacts is madeavailable for the regulated Voltage goes above the specified Over Voltage limit, the control relays areautomatically blocked there is no Voltage correction, and the same pair of Relay contacts (forUV) is made available for built-in Tap Position Indicator with 1KW step resistance can be provided optionally to indicatethe Tap No. of the Power Transformer upto a maximum of Relay uses all solid state circuitry which increases its reliability and life. The output, inputconnections are made through a terminal block.

3 However all normal precautions/care in handling/storage should be observed as for a sensitive electronic DESCRIPTIONEMCO's Solid State Automatic Voltage Regulating Relay Type EE301-T is designed for maximumoperational simplicity. It regulates the secondary Voltage of power transformers with on-loadtapchangers. The bandwidth control allows the dead-band to be set in terms of upper (LOWERVOLTS)and lower (RAISE VOLTS) Voltage limits around a particular nominal value with Time Delay control allows the regulator to respond only to Voltage fluctuations lasting forperiods greater than the selected time delay. Where the Voltage correction requires more than onetap change, the time delay is re-initiated before further tap changes. No special provisions arerequired to reset the time delay which resets automatically after the Voltage correction. Solid StateLamps (LEDs) indicate Voltage outside the preset limits and control Relay of the RAISE / LOWER Control Relay is automatically inhibited when the Voltage fallsbelow the specified undervoltage limit or goes above the Overvoltage limit.

4 One pair of normallyopen Relay contacts are provided to effect the tapchanger RAISE and LOWER operations and totrigger an alarm in case of Undervoltage / Overvoltage conditions. (Only one pair of contacts isavailable for either UV or OV)An alarm in the form of normally open contacts is provided in case of control failure AVR Relaycontinuously showing either 'L' or 'R' command for more than 15 minutes due to malfunctioning ofAVR/OLTC/ any built-in Tap Position Indicator with 1KW step resistance can be provided optionally to indicatethe Tap No. of the Power Transformer upto a maximum of AC + 15% 50Hz, 15 VAPT Supply ..110V AC 50Hz, and readable on displayNominal Value Setting (NVA)..Adjustable between 110V + 10% & readable on displayLOWER Volts between to 5V abovethe NVA and readable on displayRAISE Volts between to 5V below theNVA and readable on displayTime Delay ( Voltage Independent) TimeDelay adjustable from 10 to 120 SecsTime Delay resetting with voltagereturning to deadbandUndervoltage blocking at 80% of regulated at 85% of regulated valueOvervoltage Blocking at 132V & Restoration at 127 VControl pair of normally open potential free contacts ofrating 5A at 240V ACor 24V DC resistive load for eachLower, Raise, Control Fail & Undervoltage / Overvoltagecontrol relays (Only one pair of contacts is available foreither UV or OV)Control Pulse operation with approx.

5 2 secs on timeOperating C - 45 COverall X 160mm X 260mm (H X W X D) Kgs. (approx.) Tap Position Indicator , Max. 35 Taps with 1KW resistance2. Line drop compensator with resistive and reactive compensation of either polarity upto 20% and suitable for operation with 1A, 5VA current transformer3. Normally closed Auxiliary Supply Fail Relay Contacts4. User defined settings for PT Supply, Time Delay, Undervoltage & Overvoltage Blocking. User specified step resistance for TPI5. 4-20 mA TPI output for WITH VARIOUS INDICATIONS / CONTROLS :A. INDICATIONS1. 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 'LOWERVOLTS set R Lamp: ON whenever the PT Voltage falls below the RAISEVOLTS set UV / OV Lamp:'ON whenever the PT Voltage falls below the factoryset Undervoltage limit below 80% of the Nominalvoltage.

6 This lamp will turn-off only when the PTvoltage raises above 85% of the Nominal Voltage lamp will also be ON , when the PT Voltage goesabove the factory set Overvoltage limit above lamp will turn-off only when the PT Voltage fallsbelow 'LR' Lamp:'ON' when Lower Relay is RR Lamp: ON when Raise Relay is 'CF' Lamp:'ON' when Control Fail Relay is energised, when thePT Voltage remains outside the bandwidth for more than15 TEST Lamp: ON when AVR is in TEST Power - ON:This is a toggle switch which when ON suppliesAuxiliary Voltage to the 'R Set:This is a variable control varying from to belowNVA setting. This control sets the (lower limit of the PTvoltage below which if the Voltage reduces, thencorrective action will be taken by the instrument. Thesetting is to be read on 'NOM Set:This is a variable control to set the Nominal value ofPT Voltage varying between + 10% of 110V. This setting becomes the reference level around which L & Rsetting can be varied.)

7 The setting is to be read on 'L Set:This is variable control, varying from to NVA setting. This control sets the upper limit ofthe PT Voltage beyond which if the Voltage rises,corrective action will be taken by the setting is to be read on Time Delay:Corrective action takes place only after the TimeDelay as set by this control has elapsed and thePT Voltage continues to remain outside the setLower or Raise limits (but does not fall below theUV / OV limit).6. Test/Normal Switch for AVR:It selects the Test or Normal mode of operation. Inthe Test mode, PT Voltage is simulated internally& can be varied through the Test Control on thefront panel. An LED indication is provided toindicate that the instrument is in Test mode. In theTest mode, the control relays are cut off so thatundesired operation of OLTC is prevented duringtesting. The Voltage is monitored on the display inPT I/P position.

8 In the Normal mode external PTvoltage gets connected to the switch must be kept in Normal mode whenthe instrument is in Test Voltage Control:Simulates PT I/P in Test mode and can be variedfrom 0V to 150V Test / Normal Switch for TPI:In the Test mode, display indicates "88" forchecking the display. In Normal mode it displaysthe actual tap no. of OLTC. This switch must bekept in "Normal" Selector Switch:Selects the Voltage setting to be monitored on thedisplay. It also enables the PT Voltage to be readon the : Before connecting Aux. Supply & PT Supply to the AVR Relay , Check-up following )Mechanical Damage : Remove the front acrylic cover by removing thethumbscrews & check for any mechanical damage to the )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 &replace with good ones if OPERATING INSTRUCTION the PT & Auxiliary 110V / 230V Aux.

9 Supply to pins 1 & 2 of the Rear Panel PT Supply to pins 3 & 4 of the Rear Panel Terminal on the instrument by putting Power Switch to 'ON' the unit on for 15 minutes before making any the Test / Normal Switch is in the Normal the following settings by changing selector VALUE110 VLOWER VOLTS Setting112 VRAISE VOLTS Setting108 VTIME-DELAY Setting30 & %X Setting 0 %(in case of Relay with LDC) the selector switch to PT I/P the PT Voltage to read PT = 110V10. Note that under this condition all the lamps viz. L, R, LR, RR & UV/OV are LOWER VOLTS OPERATION CHECK :Increase the PT Supply above 112V (atleast ), but ensure that it is belowOV limit (132V). 'L' lamp should immediately turn 'LR' control pulse will come only after 30 secs. from the instant of turning onof 'L' lamp. The control pulse will remain 'ON' for 2 secs, after which the TimeDelay of 30 secs. will restart & the control pulse will come again for 2 secs.

10 & thecycle is repeated. Check the LR contacts on pins 9-10 of the Rear PanelTerminal RAISE VOLTS OPERATION CHECK :Decrease the PT Supply below 108V (atleast ), but ensure that it is aboveUV limit (88V). 'R' lamp should immediately turn 'RR' control pulse will come only after 30 secs. from the instant of turning onof 'R' lamp. The control pulse will remain 'ON' for 2 secs, after which the TimeDelay of 30 secs. will restart & the control pulse will come again for 2 secs. & thecycle is repeated. Check the RR contacts on pins 11-12 of the Rear PanelTerminal :Please note that for the operational safety, RAISE and LOWER relays areinterlocked and hence OLTC will never receive two opposite UNDER Voltage OPERATION CHECK :Reduce PT Supply below 88V (atleast ) (UV is factory set at 80% of theNominal Voltage ), UV/OV lamp will turn-on immediatelly. (Under this condition Rlamp will also be on) but the Raise control is inhibited.