GE CEX57D Instructions Manual Download | Manualshive

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Courtesy of NationalSwitchgear.com

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Summary of Contents for CEX57D

Page 1: ...49778D INSTRUCTIONS ANGLE IMPEDANCE RELAY TYPES CEX57D CEX57E CEX57F GE Power Management 205 Great Valley Parkway Malvern PA 19355 Telephone 610 251 7000 www ge com edc pm Courtesy of NationalSwitchgear com ...

Page 2: ...CHANICAL INSPECTION ELECTRICAL TESTS ELECTRICAL TESTS AUXILIARY UNIT CEX 57F ONLY INSTALLATION PROCEDURE LOCATION MOUNTING CONNECTIONS VISUAL INSPECTION MECHANICAL INSPECTION INSPECTION ANGLE IMPEDANCE TESTS PERIODIC CHECKS AND ROUTINE MAINTENANCE CONTACT CLEANING SERVICING CONTROL SPRING ADjuSTMENT ANGLE OF MAXIMUM TORQUE ADJUSTMENT BASIC REACH OHMS CORE ADJUSTMENT RENEWAL PARTS 3 3 3 4 4 4 4 6 6...

Page 3: ...er applications to restrict the area of the tripping functions used in a transmission line protective relaying scheme see Figure 4 Either three CEX57D or three CEX57F relays are required Basically tripping will be permitted only when the fault impedance plots within the reach of the mho tripping function AND both of the ohm units Since the right hand ohm unit will operate only for faults to the le...

Page 4: ... minimum ohmic reaches that are set by a double set of taps on each unit The taps are 0 5 1 5 or 3 0 ohms phase to nuetral when the maximum torque angle is set for five degrees lead current leads voltage The reach of the unit can be increased from minimum ohms 100 percent tap to ten time the minimum ohms ten percent tap by means of taps in the potential circuit The relay can be set for an ohmic re...

Page 5: ... the relay At the relay balance point the torque is zero where TR 0 I x I x TB I x E x X cos 0 0 100 TR x cos 0 0 I X I x TB I x E x 100 TR x cos 0 0 I x TB E x cos 0 0 5 x 100 100 I TR The phase to phase voltage E divided by the delta current is equal to the phase to neutral ohms Z Therefore Z cos 0 0 x 100 TR For example if the basic reach taps TB are set for 1 5 ohms and the restraint tap TR is...

Page 6: ...e two potentiometers PI for the upper unit and P2 for the lower unit can be used to adjust the angle of maximum torque to be between 30 and 35 degrees Angle of maximum torque can be set between 25 and 30 degrees using these same two potentiometers jumpers should be added or not will vary from relay to relay and will have to be determined by test of the relay actually being adjusted Whether the CHA...

Page 7: ...ngs TABLE II BASIC REACH OHMS TB ANGLE OF MAXIMUM TORQUE STUDS 13 14 STUDS 15 16 0 5 OHM TAP 1 5 OHM TAP 3 0 OHM TAP 50 Jumper 1 43 1 58 2 85 3 15 0 48 0 53 10 Jumper 0 41 0 47 1 22 1 40 2 43 2 79 15 Jumper 1 14 1 26 0 38 0 42 2 28 2 52 20 Jumper 0 34 0 38 1 02 1 13 2 04 2 25 25 Jumper 0 94 1 07 1 89 2 13 0 32 0 36 30 Open 0 31 0 37 0 92 1 11 1 83 2 22 350 Open 0 35 0 40 1 05 1 20 2 10 2 40 TAPPED...

Page 8: ... 3 06 3 95 5 60 3 0 0 16 4 11 5 13 0 12 0 80 5 50 0 5 0 09 2 14 0 08 0 74 2 89 5 50 1 5 0 11 0 08 0 80 2 75 3 45 5 50 3 0 0 14 0 10 0 81 3 59 4 41 POTENTIAL CIRCUIT The maximum potential burden imposed by the two units in the relay is shown in Table IV TABLE IV VOLTS HERTZ R X PF WATTS VA 120 60 386 536 0 59 12 74 21 8 120 50 497 523 0 69 13 74 20 0 The potential burden is maximum when the restrai...

Page 9: ...t may vary plus or minus ten percent from the instruction book values due to allowable tolerances on capacitors and coils CALCULATION OF SETTINGS The exact settings to be made on the ohm units in Type CEX57 relays will depend on the particular application When used in blinder applications the primary objective is to restrict the tripping area of the tripping units to avoid operation on load impeda...

Page 10: ...connections between the relay units and the case studs are made through stationary molded inner and outer blocks between which nests a removable connection plug which completes the circuit The outer blocks attached to the case have studs for the external connections and the inner blocks have terminals for the internal connections Every circuit in the drawout case has an auxiliary brush as shown in...

Page 11: ...gle of maximum torque The lower potentiometer P3 for the top unit or P4 for the lower unit is used to set basic reach to tap value The operating coil consists of two current coils and both coils have three taps These taps come to the two tap blocks mounted on the left side of the unit These taps determine the basic reach of the unit and both tap plugs are normally set for the same tap value See Ta...

Page 12: ... the cradle and case blocks against the internal connection diagram for the relay The rotating shaft end play should be 0 005 inch to 0 010 inch The contact gap should be 0 018 inch to 0 020 inch The contact wipe should be 0 003 inch to 0 006 inch 3 4 5 6 7 ELECTRICAL CHECKS OHM UNIT All tests should be made with the relay in its case Before any electrical checks are made on the units the relay sh...

Page 13: ...lutch slips but the moving contact will remain in contact with the left stationary contact Ohmic Reach Connect the relay per Figure 12B Set the phase angle to maximum torque I leads V by five degrees if factory adjusted With restraint taps on 100 percent basic reach taps on 1 5 ohms and V 30 volts determine current to just close the left contact of the upper unit The current should be between 9 7 ...

Page 14: ...ts and that all screws are tight MECHANICAL INSPECTION Recheck the seven adjustments detailed in the MECHANICAL INSPECTION section of ACCEPTANCE TESTS INSPECTION Before placing a relay into service the following mechanical adjustments should be checked ANGLE IMPEDANCE UNIT There should be no noticeble friction in the rotating structure of the unit The unit s moving contacts should just return to t...

Page 15: ...sed torque closing the left contact Which unit has its left contact closed and which has its right closed is determined by the direction of the current in the current circuit relative to the voltage on the potential circuit PERIODIC CHECKS AND ROUTINE MAINTENANCE In view of the vital role of protective relays in the operation of a power system The interval between it is important that a periodic t...

Page 16: ...et current to 1 0 ampere Insert the blade of a thin screwdriver into one of the slots in the edge of the spring adjusting ring see Figure 2 and turn the ring until the left contact of the unit just closes Turning the ring to the right will increase the current required to close the left contact When the left contact just closes at 1 0 ampere reduce the current to zero and check that the right cont...

Page 17: ...he upper rheostat on the unit should be turned clockwise to make the angle of maximum torque lower or counterclockwise to make the angle of maximum torque higher If studs 13 14 and studs 15 16 are not jumpered the upper rheostat on the unit should be turned counterclockwise to make the angle of maximum torque lower and clockwise to make the angle of maximum torque higher If the upper rheostat is t...

Page 18: ...ICKUP UNIT UNIT OHMS 5 185 1 43 1 58 1 22 1 40 1 14 1 26 1 02 1 13 0 95 1 07 0 92 1 11 1 05 1 20 5 12 7 14 0 14 3 16 4 15 9 17 6 17 7 19 6 18 7 21 0 18 0 21 7 16 7 19 1 40 10 10 190 40 150 15 195 40 20 20 200 40 25 25 205 40 300 30 210 40 350 35 215 40 There should be no current in the current circuits studs 5 6 and studs 7 8 when the core adjustment test is being made When the core adjustment tes...

Page 19: ...ESTRAINT L TAP PLUG CURRENT TAP BLOCK POTENTIOMETER PI CAPACITOR Cl UPPER UNIT POTENTIOMETER P3 CAPACITOR C2 LOWER UNIT POTENTIOMETER P2 POTENTIOMETER P4 Figure 1 8042959 Type CEX57 Relay Withdrawn from Case 19 Courtesy of NationalSwitchgear com ...

Page 20: ...G MOVING CONTACTS UPPER CONTROL SPRING NORMALLY OPEN STATIONARY CONTACT NORMALLY CLOSED STATIONARY CONTACT Figure 2 8041447 Four Pole Induction Cylinder Unit Typifying Construction of the Units in Type CEX57 Relays 20 Courtesy of NationalSwitchgear com ...

Page 21: ...GEK 49778 X R Figure 3 0269A3051 0 Relay Characteristic on R X Diagram 21 Courtesy of NationalSwitchgear com ...

Page 22: ... UJ ZD X CD I l O HMS RES STIVE co H 1 I HH UJ O n cn 2 x O 2 1 90 2I CEX57 ZL TRANSMISSION LINE MT TRIPPING FUNCTION Figure 4 0269A3050 0 Relay Characteristic on Polar Diagram 22 Courtesy of NationalSwitchgear com ...

Page 23: ...OM TRIPPING RELAYS _ 21 1 i _ 21 2 i _ 2l 3 12 12 12 I L 2l I LL 21 2 lL 21 3 0 i T Bi NOTES l ONLY ONE CEX57E REQUIRED IS OlT OF STEP TRiPPiNG APPLICATIONS SELECT ANYONE OF 21 1 21 2 OR 21 3 AND USE CONNECTIONS SHOWN 3 o 3 o 3 2 SEE APPROPRIATE NAA OR GSY INSTRUCTION BOOK FOR DC CONNECTIONS TO CEXS7E RELAY FOR USE IN OuT OF STEP TRIPPING APPLICATIONS REFER TO NEAREST GE OlSTRiC SALES OFFICE FOR S...

Page 24: ...GEK 49778 IA IB IA IB t I c i P3 c T i c EAB o c i i b j PI SCHEMATIC OF ANGLE IMPEDANCE UNIT Figure 6 0269A3052 0 Schematic of Unit 24 Courtesy of NationalSwitchgear com ...

Page 25: ...GNET COILS r WAVE WASHFRS D OCTAGON NUT FOR CORE ADJUSTMENT E FLAT WASHER F CORE HOLD DOWN NUT HEXAGON 3 t x x i I f Hg o c D E F Figure 7 0208A3583 0 Exploded View of Four Pole Induction Cyl inder Unit 25 Courtesy of NationalSwitchgear com ...

Page 26: ... TERMINAL BLOCK SHORTING BAR NOTE AFTER ENGAGING AUXILIARY BRUSH CONNECTING PLUG TRAVELS 1 4 INCH BEFORE ENGAGING THE MAIN BRUSH ON THE TERMINAL BLOCK Figure 8 8025039 Cross Section of Drawout Case Showing Position of Auxiliary Brush 26 Courtesy of NationalSwitchgear com ...

Page 27: ...LOWER n u P P 2 u UPPER UPPER TA 90 10 LOWER LOWER T OPER OPER LOWER LOWER POL POL OPER UPPER OPER UPPER POL POL A A 6 y y V V V V V V V o 3 s 9 f 7 o o 0 o o 2 6 8 4 10 SH0RT FINGER Figure 9 0269A3036 2 Internal Connection Diagram for Type CEX57D Relays Revised since last issue 27 Courtesy of NationalSwitchgear com ...

Page 28: ... ra rzJ uPI P4 P2 t 2 LOWER UPPER 90 0 i 02 AI Bl ZZ A2 OPER OPER LOWER LOWER POL POL OPER UPPER PER UPPER POL POL j V V V V V V V V 7 9 5 3 o o o o o 2 6 8 10 4 T SHORT FINGER Figure 10 0269A3037 2 Internal Connection Diagram for Type CEX57E Relays Revised since last issue 28 Courtesy of NationalSwitchgear com ...

Page 29: ... Pi P2 2 S0V 1 LOWER 1 P4 R 4 pH i n L a I2 SV 2 t t l r 2 r 1 i R 3 10 90 R2 T4 u LOWER CPER OPER UPPER LOWER LOWER RI T POL POL OPER UPPER OPER C5 Dl j A UPPER POL POL V V v V V V V V V v i 3 S 7 9 o o o o o 2 4 6 8 10 SHORT FINGER Figure 11 0269A3038 2 Internal Connection Diagram for Type CEX57F Relays Revised since last issue 29 Courtesy of NationalSwitchgear com ...

Page 30: ...TY CHECK THREE PHASE 115 VOLTS RATED FREQUENCY r T BOTTOM TEST PLUG s2 SA A o LOAC BOX O 9 8 PHASE S M I F T E R Ci o PHASE ANGLE METEI V i B P I C K UP ADJUSTEMENT Figure 12 K 6556491 1 Test Connections for Type CEX57 Relays 30 Courtesy of NationalSwitchgear com ...

Page 31: ...GEK 49778 O CM m O to in O o o o o o CD o CD O OJ 7b BASIC OHMS REACH Figure 13 0269A3053 0 Reach Curve for Type CEX57 Relays 31 Courtesy of NationalSwitchgear com ...

Page 32: ...ASE 8 00 203MM RANEL 75 I 400MM J i I 5 7S 47M 5 781 V DLESJ 4 H n IS 18 STUD Li 1 16 00 40GMM 44MM 1 75 293MM II S62 3 5 DO OUT CUT I90MM 7 50 1 88 MM U9MM e 3 1 3 f 00 1 76MM 11 DRILL D 6 HOLES 6MM I8MMH VIEW SHOWING 718 ASSEMBLY OF HARDWARE FOR SURFACE MTG ON STEEL PANELS CI2MM 500 TYPICAL 6MM ZbOjf PANEL DRILLING FOR SEMI FLUSH MOUNTING FRONT VIEW PANEL DRILLIN6 FOR SURFACE MOUNTING CFRONT VIE...

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