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Summary of Contents for 12IFD51DA

Page 1: ...INSTRUCTIONS GEK 34069B PERCENTAGE DIFFERENTIAL RELAY TYPE IFD MODEL 12IFD51D A GENERAL W ELECTRIC Courtesy of NationalSwitchgear com ...

Page 2: ...E FAULT DETECTOR TARGET SEAL IN UNIT RECEIVING HANDLING AND STORAGE ACCEPTANCE TEST VISUAL INSPECTION MECHANICAL INSPECTION DRAWOUT RELAYS GENERAL POWER REQUIREMENTS GENERAL ELECTRICAL TESTS INDUCTION UNIT PICKUP T E S T OPERATING CURRENTS RESTRAINT CURRENT INSTANTANEOUS UNIT FAULT DETECTOR SETTING THE INSTANTANEOUS UNIT TARGET AND SEAL IN UNIT PICK UP AND DROP OUT TEST INSTALLATION ELECTRICAL TES...

Page 3: ...eaker CT s on the tap used by the ratio of the neutral CT The purpose of the instantaneous unit in the IFD51D is to make the relay shock resistant The pick up setting of the instantaneous unit should be set so that it does not reduce the sensitivity of the protection Since the basic sensitivity of the main unit of the relay is 0 5 or 1 0 amperes it is suggested that the setting of the instantaneou...

Page 4: ...currents in the two restraint coils are equal With equal currents flowing in all three restraint coils the operating current required to close contacts will be approximately 1 23 times that required with the same current flowing in only two restraint coils With the operating coil set on the 12 5 percent tap the induction unit will close its contacts at 0 5 amps with zero restraint current On the 2...

Page 5: ... K1 Rl 2 JR32 S 2 where I0 operating current required to close contacts IRI IR2 R3 current in each of the three restraining coils respectively 1 Operating coil current to overcome spring force Close contacts with zero restraining current and Design constant of relay may be determined by working operating current equation with point on operating current vs restraint curve Note Ki and 1 are a functi...

Page 6: ...sk unit is used to adjust the operating coil current required to close contacts with no current in the restraints This control spring may be adjusted by turning the notched adjusting ring The time dial is above the control spring The time dial is used to increase the travel on the disk and this increase operating time The time dial on the IFD51D is locked by two locking screws through the top of t...

Page 7: ...moved and cause trouble in the operation of the relay ACCEPTANCE TEST Immediately upon receipt of the relay an inspection and acceptance test should be made to insure that no damage has been sustained in shipment and that the relay calibrations have not been disturbed VISUAL INSPECTION Check the nameplate stamping to insure that the model number and rating of the relay agree with the requisition R...

Page 8: ...uit to show continuity when the induction disk unit contacts close Set on the 25 percent tap the contact closing current should be approximately 0 9 amps OPERATING CURRENTS RESTRAINT CURRENT See Figure 7 for test connections and Figure 1 for relay internal connections With the three restraint currents wired in series jumper stud 7 to 8 9 16 apply 5 amps to the three restraints be tween studs 6 17 ...

Page 9: ...d be set at their desired operating points and these settings should be electrically tested LOCATION The location should be clean and dry free from dust and excessive vibration and well lighted to facilitate inspection and testing MOUNTING The relay should be mounted on a vertical surface The outline and panel diagram is shown in Figure 2 CONNECTIONS Internal connection diagram is shown in Figure ...

Page 10: ...he actual points of contact Never use knives files abrasive paper or cloth to clean relay contacts A burnishing tool as described above can be obtained from the factory 5 Instantaneous overcurrent unit adjustment Select the current above which it is desired to have the instantaneous unit operate and set the adjustable pole piece so that the top of hexagon head is even with the desired calibration ...

Page 11: ...red per 3 above the relay should pass the three restraint test given under Acceptance Tests RENEWAL PARTS It is recommended that sufficient quantities of renewal parts be carred in stock to enable the prompt replacement of any that are worn broken or damaged When ordering renewal parts address the nearest Sales Office of the General Electric Company specify quantity required name of the part wante...

Page 12: ...FT 0 TOP R f Mi BOT LOWER RIGHT UPPER RIGHT SI 0 S R I R V y N V v v V V V V V O J 9 3 5 7 o o C C 4 2 6 8 OPERATING 001L R RESTRAINT COIL SHORT FINGER FIG 1 0246A2241 2 Internal Connections For Model IFD51D 12 Courtesy of NationalSwitchgear com ...

Page 13: ...30 C 30 5 8 7 875 200MM 000 203MM 5 781 147MM I A r4 75 I y 121MM t L I 9 5Q f F 242HM 375 QQ 7 50 l 718 J 250 18MM 6M M i t i 9 CUTbUT I f I 15 75 400MM 11 562 294MM 16 000 406MM 19 7 1 4 1 468 37MM V I J 2 843 72MM 500 12MM TYPICAL 218 218 5 25 5MM 5MM 133MM 5 687 3 4 DRILL 20 HDLES 19MM PANEL 144MM JiliTit PANEL DRILLING FDR SURFACE MOUNTING FRONT VIEW PANEL DRILLING FDR SEMI FLUSH MDUNTING FRD...

Page 14: ...T1 CD CO o ro P cn CO cr Co i o o O CD o r un o p r PU O o r O cn r O n o s rr CD n o an n o RESTRAI NT CURRENT AMPERES ...

Page 15: ... 7 0 9 1 I 0 C w 8 7 6 5 4 3 2 CO 15 CZ o o UJ CO z 0 I UJ 09 2 08 07 06 05 04 03 02 MULTIPLE OF OPERATING CURRENT REQUIRED TO CLOSE CONTACTS WITH RESTRAINT CURRENT INDICATED FIG 4 0246A3649 3 Time Current Curve for the IFD51D Relay 15 Courtesy of NationalSwitchgear com ...

Page 16: ... IX 4 CD CO CD 11 CD CD i o 52 O o CD a CD m m x S S3 7 rt l NEUTRAL RESISTOR CD CO TC CD D 3 o QJ CD OP INST yV rA V o CD l7 O Z3 CIRCUIT BREAKER xn ZS D n AA AAJ ri AUX CT IF REQUIRED TO MATCH CT RATIOS X o rs to o D zr n n o CD REST O PJ 11 1 QJ REST 0 8 REST 17 16 ...

Page 17: ...HORTiNG BAR NOTE AFTER ENGAGING AUXILIARY 8RUSH CONNECTING PLUG TRAVELS 1 4 INCH BEFORE ENGAGING THE MAIN BRUSH ON THE TERMINAL BLOCK AUXILIARY BRUSH FIG 6 8025039 Cross Section Of Drawout Case Showing Position Of Auxiliary Brush And Shorting Bar 17 Courtesy of NationalSwitchgear com ...

Page 18: ...S A2 AO 11 o L O 7 TO ACCURATELY REPRODUCE KLAY CHARACTERISTICS ILL TESTS SHOULD BE MADE WITH RELAY IN CASE WITH CASE LEVEL BLOCK INSTANTANEOUS UNIT I CLOSED FOR LIGHT TO SHOW INDUCTION UNIT PICKUP TESTING TWO RESTRAINTS AT A TIME REMOVE JUMPERS SHOWN AND TIE STUDS 6 8 16 TOGETHER FOR FIG 7 0246A3653 I I Test Connections for Model IFD51D 18 Courtesy of NationalSwitchgear com ...

Page 19: ...Since the A revision Figures 2 4 and 7 have been updated Courtesy of NationalSwitchgear com ...

Page 20: ...å å å å 3RZHU 0DQDJHPHQW 215 Anderson Avenue Markham Ontario Canada L6E 1B3 Tel 905 294 6222 Fax 905 201 2098 www ge com indsys pm Courtesy of NationalSwitchgear com ...

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