NATIONAL SWITCHGEAR HFC21B Instructions Manual Download | Manualshive

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Summary of Contents for HFC21B

Page 1: ...GEK 49826D INSTRUCTIONS INSTANTANEOUS OVERCURRENT RELAYS TYPES HFC21B HFC22B HFC23C GE Protection and Control 205 Great Valley Parkway Malvern PA 19355 1337 Courtesy of NationalSwitchgear com ...

Page 2: ...CAL INSPECTION DRAWOUT RELAYS GENERAL POWER REQUIREMENTS GENERAL HI SEISMIC INSTANTANEOUS UNIT INSTALLATION INSTALLATION TESTS PERIODIC CHECKS AND ROUTINE MAINTENANCE CONTACT CLEANING COVER CLEANING SYSTEM TEST SERVICING HI SEISMIC INSTANTANEOUS UNIT RENEWAL PARTS LIST OF FIGURES 3 4 4 5 5 5 6 6 6 7 7 7 7 8 8 8 9 9 9 9 9 9 10 11 Cover Photo 8043211 2 Courtesy of NationalSwitchgear com ...

Page 3: ...ays and an automatic reclosing scheme to provide coordination with branch fuses instantaneous units in these applications their transient overreach characteristic shown in Figure 7 must be considered The percent transient overreach must be applied to proportionately increase the calculated pickup setting so that the instantaneous units will not overreach a downstream device thereby causing loss of...

Page 4: ...onnection block engage the shorting bar located at the lower front of the case to short circit external current transformer secondary connections The window provides visual confirmation of CT shorting The connection plug then clears the current circuit contact brushes on the case and finally those on the relay support structure to completely de energize the drawout element The instantaneous unit i...

Page 5: ... be 8 50 amps There will always be at least one ampere overlap between the maximum L setting and the minimum H setting Always select the higher range whenever possible since it has a higher continuous rating Higher currents may be applied for shorter lengths of time in accordance with the formula I KTF CONTACTS The contacts will carry 30 amperes trip current BURDENS The hi seismic instantaneous un...

Page 6: ...ained in transit handling is evident file a damage claim at once with the transportation company and promptly notify the nearest General Electric Apparatus Sales Office Reasonable care should be exercised in unpacking the relay in order that none of the parts are damaged or the adjustments disturbed I f the relays are not to be installed immediately they should be stored in their original cartons ...

Page 7: ... bars agree with the internal connections diagram 3 If there is a need to tighten any screws DO NOT OVERTIGHTEN Overtightening may cause stripping CAUTION DRAWOUT RELAYS GENERAL The HFC relays may be tested without removing them from the panel by using the 12XCA11A1 four point test probes These test probes make connections to both the relay and the external circuitry which provides maximum flexibi...

Page 8: ...1 To set the instantaneous unit to a desired pickup loosen the locknut and adjust the core Turning the core clockwise decreases the pickup turning it counterclockwise increases the pickup Bring up the current slowly until the unit picks up It may be necessary to repeat this operation until the desired pickup value is obtained Once the desired pickup value is reached tighten the locknut REFER TO TA...

Page 9: ...individual requirements it is suggested that the points listed below be checked at an interval of from one to two years The interval between CONTACT CLEANING A flexible burnishing tool should be used for cleaning relay contacts This is a flexible strip of metal with an etched roughened surface which in effect resembles a superfine file The polishing action of this file is so delicate that no scrat...

Page 10: ...s advised that no mechanical adjustments be made if seismic capability is of concern 2 Since RENEWAL PARTS Sufficient quantities of renewal parts should be kept in stock for 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 the name of the part wanted quantity required and complete name...

Page 11: ...tial Scheme for Motor Protection 6 16 Transient Overreach Characteristics of the Hi Seismic Instantaneous Unit 7 17 Time Current Characteristics of the Hi Sesimic Instantaneous Unit 8 18 Test Connections for Testing Current Transformer Secondary Used with the HFC Relay 9 19 10 Test Connections for Testing Pickup and Operating Times of the Type HFC Relay Hi Seismic Instantaneous Unit 20 11 Cross Se...

Page 12: ...OUS UNIT TARGET Figure 1 8043212 Type HFC23B Relay Removed From Case Front View RANGE SELECTION LINKS INSTANTANEOUS UNIT ADJUSTABLE CORE TARGET RESET MECHANISM SUPPORT STRUCTURE Figure 2 8043213 Type HFC23B Relay Removed from Case Rear View 12 Courtesy of NationalSwitchgear com ...

Page 13: ... v V V V Y o o 0 2 4 6 o o o 1 3 5 INST SETTING SET LINK TO Hv FOR HIGH RANGE AND TO L FOR LOW RANGE LINK SHOWN IN HIGH RANGE POSITION SHORT FINGERS Figure 3 0269A3074 0 Type HFC21B Internal Connections Diagram Front View 13 Courtesy of NationalSwitchgear com ...

Page 14: ...V L H H L V V V v v v v v j V V o o o o 2 4 10 6 c o o o 1 3 5 9 INST SETTINGS SET LINK TO Hft FOR HIGH RANGE AND TO L FOR LOW RANGE LINK SHOWN IN HIGH RANGE POSITION SHORT FINGERS Figure 4 0275A1900 0 Type HFC228 Internal Connections Diagram Front View 14 Courtesy of NationalSwitchgear com ...

Page 15: ... O QD oat H L L H L H V V v V V v v v v V V 8 10 4 2 6 12 0 o o o o o 3 5 7 9 II INSTANTANEOUS SETTINGS SET LINK TO H FOR HIGH RANGE AND TO vL FOR LOW RANGE LINK SHOWN IN HIGH RANGE POSITION Figure 5 0285A6295 0 Internal Connections for Rel ay Type HFC23C Front View 15 Courtesy of NationalSwitchgear com ...

Page 16: ... ALARM NOTE LAS AN OPTION CONNECTING STUD 3 TO ALARM BUS WILL PROVIDE AN ALARM WHEN RELAY CONNECTION PLUG IS REMOVED DO NOT USE THIS KIND OF CONNECTION ON THE TRIP CIRCUIT SINCE A FALSE TRIP WOULD OCCUR TC Figure 6 0285A7123 0 External Connections for Type HFC23C SelfBalancing Primary Current Differential Scheme for Motor Protection 16 Courtesy of NationalSwitchgear com ...

Page 17: ...D PERCENT OVERREACH 100 s fD 50 o rv o o CO 5 IE 4 MO S i i ro co o ct ft LU Q 5 00 QJ 3 GD m 00 o 7 9 H H CO Z5 13 0 0 r t 4 3o HI SEISMIC MINIMUM PICK UP l VO I 00 sf n 5 no UJ Oi O S 13 fD fD QJ O O C 0 zr l D cz rs D r OJ O r fD 5 10 00 t MAXIMUM PICK UP HI SEISMIC o C T 93 10 60 0 uo 50 30 80 76 20 ANGLE IN DEGREES LAG ...

Page 18: ... CD CL CO u_ o 3 Ui 3 CL to to 1 o i s o 5 LU iO CO cu in tn uD o LD 8 CM Q o o S0N003S Nl 3Wli dfDOId Figure 8 0208A8695 1 Time Current Characteristics of the Hi Seismic Instantaneous Unit 18 Courtesy of NationalSwitchgear com ...

Page 19: ...E SIDE RELAY SIDE CASE SIDE A 5 I2XGAIIAI 6 I2 XCAIIAI OR 5 6 12 X C A I I A 2 A TEST CONNECTIONS FOR TESTING GT SECONDARY USED WITH THE IFC RELAY Figure 9 0269A1787 1 Test Connections for Testing Current Transformer Secondary Used with the Type HFC Relay 19 Courtesy of NationalSwitchgear com ...

Page 20: ...o o o o o o RELAY SIDE CASE SIDE RELAY SIDE CASE SIDE RELAY SIDE _ CASE SIDE 12 XCA11A1 o o o o 9e o 5 CT JUMPER TEST CONNECTIONS FOR TESTING PICKUP AND OPERATING TIMES OF THE HFC RELAY INSTAN TANEOUS UNIT WITH ELECTRICALLY SEPARATE CONTACTS Figure 10 0275A1904 0 Test Connections for Testing Pickup and Operating Times of Type HFC Relay Hi Seismic Instantaneous Unit 20 Courtesy of NationalSwitchgea...

Page 21: ...T SUPPORT STRUCTURE CONTACT FINGERS CONNECTION PLUG WINDOW RELAY CASE CASE CONNECTION BLOCK SHORTING BAR Figure 11 8042715 Cross Section of Type HFC Relay Drawout Case Showing Shorting Bar 21 Courtesy of NationalSwitchgear com ...

Page 22: ...2 562 65MM o I n CUTOUT 6 750 171MM 6 188 157MM 1 t 9 3 094 79MM t 3 375 86MM J U o EXTERNAL CONNECTIONS 10 32 SCREWS 2 844 72MM 5 688 MOUNTING SURFACE SIDE VIEW 144MM PANEL DRILLING TIE SUPPORT SEMI FLUSH MOUNTING OR PANEL MAX 125 THK TIE ANCHOR WASHER LOCKWASHER 8 32 SCREW r 3MM T 1 I h 10 32 SCREW THREADCUTTING I h r1 NUT CABLES CABLE TIE VIEW D VIEW A HDW 0257A8549 G 1 Figure 12 0257A8452 1 Sh...

Page 23: ...88 5MM THK MAX PANEL LOCK WASHER 8 36 SCREW 8 344 NUT REMOVE KNOCKOUT 212MM V 3 688 94MM 2 375 i 61MM c OVERSIZE WASHERS VIEW B t HDW 0257A8549 G2 C 469 7 SEE VIEW C MOUNTING SURFACE WASHER LKWASH k 12MM 4 750 4 o cTc 750 121MM EXTERNAL CONNECTIONS 10 32 SCREWS 19MM o e i o o o 625 T c w 3 1WM 2 219 HLS 5MM 625 TYP 16MM FOR 312 MOUNTING SURFACE SIDE VIEW NUT l 156 HLS 4MM 8MM SPACER L REMOVE KNOCK...

Page 24: ...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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