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OCTOBER 2003

APPLICATION AND COMMISSIONING

MANUAL FOR NUMERICAL BIASED

DIFFERENTIAL PROTECTION RELAY

TYPE - MIB202

EASUN REYROLLE LIMITED

Содержание MIB202

Страница 1: ...1 OCTOBER 2003 APPLICATION AND COMMISSIONING MANUAL FOR NUMERICAL BIASED DIFFERENTIAL PROTECTION RELAY TYPE MIB202 EASUN REYROLLE LIMITED ...

Страница 2: ...2 ISSUE NO 1st Issue DATE OF ISSUE 01 10 2003 DEPARTMENT AS ...

Страница 3: ...3 CONTENTS PAGE APPLICATION 4 9 INSTALLATION 10 19 COMMISSIONING 20 25 DRAWING 26 ...

Страница 4: ...rmer are measured taking in to the Power Transformer vector grouping and transformation ratio Software interposing current transformers can be applied to each set of current inputs to correct for any magnitude and vector mismatch and to remove zero sequence components where necessary They are then summed to form an operate signal which is applied to a three part biased differential characteristic ...

Страница 5: ...lue must be chosen which will cover the maximum through fault current of the transformer This setting gives more stability during CT saturation for heavy through fault Setting Range SL 200 to 2000 of In in steps of 100 2 0 DIFFERENTIAL INSTANTANEOUS HIGHSET OVER CURRENT This is an unbiased instantaneous element in the differential circuit with a range of settings expressed as percentages of the no...

Страница 6: ...ion can be selected from this range of settings The settings define the LV and HV winding configuration E g Yd followed by the angular position of the LV phasor with respect to the HV phasor The angular position is described by the hour hand position on the twelve hour clock face e g Yd1 or Yd11 In each setting this is followed by the same angular relationship expressed in degrees The complete Yd1...

Страница 7: ... 1049 76A CT ratio for LV side is 1200 1 Mean tap value 5 15 2 5 HV current at 5 tap 60MVA 1 732 132KV 0 95 276 2A HV Multiplier 300 276 2 1 086 1 09 LV CT secondary current 1049 7 1200 0 87475A So the LV multiplier 1200 1049 7 1 143 1 14 Initial Setting 200mA 20 or 2 times of maximum spill current whicheverisgreater Bias setting 20 2 times of maximum tap change Bias Slope Limit 4 times of full lo...

Страница 8: ...d3 YNd3 Yd3 90 Yy0 0 Yd3 YNd3 Earthing Transformer Yd3 90 Ydy0 0 Yy4 YNy4 Yyn4 YNyn4 Ydy4 Yndy4 Ydyn4 YNdyn4 Yd5 150 Yd1 30 Yd5 YNd5 Yd5 150 Yy0 0 Yd5 YNd5 Earthing Transformer Yd5 150 Ydy0 0 Yy6 YNy6 Yyn6 YNyn6 Ydy6 Yndy6 Ydyn6 YNdyn6 Yd7 150 Yd1 30 Yd7 YNd7 Yd7 150 Yy0 0 Yd7 YNd7 Earthing Transformer Yd7 150 Ydy0 0 Yy8 YNy8 Yyn8 YNyn8 Ydy8 Yndy8 Ydyn8 YNdyn8 Yd9 90 Yd1 30 Yd9 YNd9 Yd9 90 Yy0 0 Y...

Страница 9: ...Ydy0 0 Yd5 150 Dy7 Dyn7 Earthing Transformer Ydy0 0 Yd5 150 Dy9 Dyn9 Ydy0 0 Yd3 90 Dy9 Dyn9 Earthing Transformer Ydy0 0 Yd3 90 Dy11 Dyn11 Ydy0 0 Yd1 30 Dy11 Dyn11 Earthing Transformer Ydy0 0 Yd1 30 Notes 1 Y or y denotes an unearthed star connection on the HV or LV side of the transformer respectively 2 YN or yn denotes an earthed star connection on the HV or LV side of the transformer respectivel...

Страница 10: ...g procedures should be observed Before removing the relay from its case the operator must first ensure that he is at the same potential as the relay by touching the case The relay must not be handled by any of the relay terminals at the rear of the chassis Ensure that anyone else handling the relay is at the same potential As there are no user serviceable parts and adjustable user settings inside ...

Страница 11: ...ections for changing the relay rating from one to other To ensure the current rating of the relay check the connection of CT wires connected to the bottom TB Terminal Block at the rear of the chassis as per the following table For 1A Phase Terminal No of TB Ferrule No of CT Wire Black A 1 1A B 3 3A HV Side C 5 5A A 7 7A B 9 9A LV Side C 11 11A For 5A Phase Terminal No of TB Ferrule No of CT wire B...

Страница 12: ...erminal 6 Push the boot of 9B wire to completely cover the crimp Same procedure in reverse is to be followed to change from 5A to 1A using appropriate wire numbers 2 2 HUMAN MACHINE INTERFACE HMI The user friendly HMI provided on the front panel has following features 1 Six digit 7 segment LED display First two digits are Red colour and other four digits are Green colour First two digits Red displ...

Страница 13: ...Ensure Protection Healthy LED Green is ON and indication appears on the LED display unit Wait until the indication goes off Press or key is displayed Represents MIB 202 relay Press key repeatedly scrolls down the Factory setting Main menu in the following order on the display Initial setting in of nominal rating Bias slope setting in Slope limit setting in of Restraining current I1 I2 2 Current Am...

Страница 14: ...ps of 5 Restraining characteristics Pressing key represents slope setting is 20 display will appear press key Submenu LED On to get the Sub menu Pressing or key change the bias characteristic percentage setting 10 to 70 Upon selecting the desired setting once again press the key Sub menu LED goes OFF to return to the main menu 3 4 DIFFERENTIAL BIAS SLOPE LIMIT SETTINGS Setting range 200 to 2000 of...

Страница 15: ...plitude correction setting of LV winding current input is 1 00 press key Submenu LED On to get the Sub menu Pressing or key changes the current amplitude correction setting in 0 01 increment or decrement Upon selecting the desired setting once again press the key Sub menu LED goes OFF to return to the main menu 3 6 VECTOR GROUP COMPENSATION SETTINGS 3 6 1Vector group compensation on HV windings Se...

Страница 16: ...FF 400 to 2500 of nominal current in steps of 100 Pressing key repeatedly get Main menu represents the highset element is OFF Press key Submenu LED On to get Submenu Pressing or key changes the highset setting by 100 of rated current After selecting the desired setting once again press the key Sub menu LED goes OFF to get back the main menu 4 0 ACCEPTANCE OF SETTINGS ENTER For the relay to accept ...

Страница 17: ...es tripping To find which element operated press or key There is possibility for the following display after the trip Indicates r phase trip Indicates y phase trip Indicates b phase trip Indicates Highset element of r phase trip Indicates Highset element of y phase trip Indicates Highset element of b phase trip Once the fault is cleared press key twice to reset the trip indication The trip indicat...

Страница 18: ...ase relay current after amplitude and phase angle Vector group correction correction Indicates r phase restraining current Indicates r phase differential current Indicates HV winding y phase line current Indicates LV winding y phase line current Indicates HV winding y phase relay current after amplitude and phase angle Vector group correction correction Indicates LV winding y phase relay current a...

Страница 19: ...in menu Protection setting the same sub menu key has to be pressed for again 10 secs This is true even the relay is tripped After about 10 minutes I e power save mode During which the relay seven segment LED display goes off if none of the front keys are pressed the relay will back to the main menu Protection mode for any key press after the relay went to power save mode Note The above metering di...

Страница 20: ... applied before any secondary testing is started 4 PRECAUTIONS Before testing commences the equipment should be isolated from the current transformers and the CT s to be short circuited in line with the local site procedures The tripping and alarm circuits should also be isolated where practical Also ensure that trip links are removed Ensure that correct DC auxiliary voltage and polarity is applie...

Страница 21: ...e connected either as 1A or 5A rated device The user should check this before commencing secondary testing Please refer Sec 2 1 in Installation a CHECKING THE BIAS CHARACTERISTIC To check the bias characteristics using the simple single phase test circuit shown in fig 1 The relay must be set as follows Initial setting is to be the same value as bias slope HV Interposing CT multiplier 1 00 HV Inter...

Страница 22: ...o verify the secondary connection of a neutral CT relative to the phase CT s and the relay In these circumstances primary current must be injected through the associated power transformer winding It may be necessary to short circuit another winding in order to allow current to flow Refer Fig 2 During these primary injection tests the injected current is likely to be small due to the impedance of t...

Страница 23: ...nsert the DC supply fuse 3 Check the relay healthy indication display 4 Replace the relay cover 5 Insert the trip links 6 Perform trip test by secondary injection 7 Remove all test connections Fig 1 Circuit For Checking the Bias Characteristics 2 7 A2 A1 1 8 Bias Current Operate Current MIB202 ...

Страница 24: ... 56 30 30 0 30 0 35 0 53 0 71 0 88 40 40 0 40 0 50 0 75 1 00 1 25 50 50 0 50 0 67 1 00 1 33 1 67 60 0 5 0 86 1 29 1 71 2 14 70 0 5 1 08 1 62 2 15 2 69 Table 1 Normal Operate Values Bias Current Ammeter Al Multiples of rated current In Initial Settings Bias Settings 0 1 1 5 2 2 5 Operate Current Ammeter A2 Amps 10 10 20 20 30 30 40 40 50 50 60 70 Table 2 Operate values Measured on Ammeter A2 ...

Страница 25: ...25 Fig 2 Primary Injection Test Circuit 1 2 3 4 5 6 7 8 9 10 11 12 MIB 202 Dyn11 30º r y b R Y B P1 S1 S2 P2 P2 S2 S1 P1 440V AC Source ve ve D C SUPPLY 22 24 23 ...

Страница 26: ...EARTH SUPPLY VE 23 22 24 VE 14 13 TRIP 15 16 18 19 20 17 BIASED 8 7 7 7 B A 10 9 9 9 B A 6 5 5 5 B A 4 3 3 3 B A 2 1 1 1 B A 12 11 11 B A 11 K Sivakumaravel 5 A 7 A 9 A 1 A 1 1 A 3 A Note 1 CT Circuits are shown connected to Relay 1A tap For 5A tap remove wires and connect wires to terminal numbers 1 3 5 7 9 11 respectively unused current terminals are fitted in Parking rack in the terminal block ...

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