GE GSY51A, Instructions Manual

Page 1: ...GEK 45441C Supersedes GEK 45441B INSTRUCTIONS MHO AND AUXILIARY RELAY for OUT OF STEP PROTECTION TYPE GSY51A GENERAL ELECTRIC Courtesy of NationalSwitchgear com ...

Page 2: ...10 10 10 11 12 CONSTRUCTION 13 GENERAL 13 DRAWOUT RELAYS POWER REQUIREMENTS 13 13 ACCEPTANCE TESTS VISUAL INSPECTION MECHANICAL INSPECTION ELECTRICAL TESTS MHO UNIT ACCEPTANCE TESTS STANDARD FACTORY CALIBRATION MHO UNIT ACCEPTANCE TESTS FACTORY ADJUSTED PER CUSTOMER S SETTINGS 13 14 14 15 18 20 INSTALLATION PROCEDURE INSPECTION LOCATION MOUNTING CONNECTIONS MECHANICAL INSPECTION 20 20 20 20 21 21 ...

Page 3: ...n the transmission system Hence the resulting swing impedance locus intersected transmission lines and would be detected by line relaying or by out of step detection schemes located at line terminals and in most instances the system could be separated without the need for tripping generators With the advent of EHV systems larger generators and the general expansion of transmission systems the impe...

Page 4: ...ay under certain conditions appear as an impedance swing to the CEX GSY scheme misoperation during the clearing of such a fault on the system i t is suggested that an instantaneous ground overcurrent relay be connected to supervise the CEX GSY contact circuit as shown in Figure 10B To avoid this remote possibility of a OPERATION OF THE SCHEME The operating principles of the scheme can be explained...

Page 5: ...the XI contact Step 4 When the impedance locus enters region H to the left of blinder A 21ST A2 opens 21ST A1 closes and 21ST B1 remains closed opening of A2 de energizes the X2 unit and the closure of A1 picks up unit X4 The 12 cycle dropout time of the X2 unit provides time for X3 to pick up through the X2 and X4 contacts and the X unit contact which has previously closed these contacts and the ...

Page 6: ...basic minimum ohmic reach of the relay can be selected TABLE I Minimum Reach Phase to Neutral Links A B 2 0 ohms 4 0 ohms 6 0 ohms 2 0 0 4 4 2 The basic minimum reach can be extended up to ten times the basic reach by reducing the restraint circuit setting on the restraint transformer The following equation can be used for increasing the basic minimum reach of the relay 100 90 lead Z Relay x basic...

Page 7: ...se contacts when closed can carry 30 amperes for one second with a continuous rating of 3 amperes The The interrupting rating of these contacts is listed in Table II TABLE I I Volts Interrupting Rating in Amperes DC Inductive Non Inductive 125 0 50 1 5 TARGET SEAL IN The combination target and seal in unit has a dual rating of 0 6 or 2 0 amperes The tap setting selected on the target seal in unit ...

Page 8: ...is produced by the interaction between the polarizing flux and the fluxes which are proportional to the restraining and or operating quantities The torque at the balance point of the mho unit can be expressed by the following equation Torque 0 Ei Cos 0 0 KE2 Ks Where Phase to phase voltage Delta currents I l l2 Angle of maximum torque Power factor angle of the fault impedance Design constant Ks Co...

Page 9: ...imposed on each current transformer at 5 amperes by the current circuits of the GSY51A relay is listed in Table IV for each basic minimum reach tap at 60 hertz TABLE IV Basic Reach Tap 0 N R X V A U P F 2 0 0 142 0 110 0 081 0 054 0 065 0 170 3 55 3 30 0 930 0 860 0 430 4 0 2 75 2 365 0 870 6 0 2 025 The burden at 50 hertz will be slightly lower POTENTIAL CIRCUITS The maximum burden imposed on eac...

Page 10: ...e B is normally selected so that both blinders are approximately parallel to the total impedance line CD The spacing between blinders is generally selected so that at the point in an impedance swing where the blinders operate the angular separation S between generator and system is 1200 This angular separation can be determined by drawing construction lines at points C and D that are 30 from the t...

Page 11: ...nce loci for system impedances of 0 05 0 09 0 2 and 0 4 per unit on the generator base To facilitate comparison with the relay characteristics the examples in these figures are presented in terms of secondary ohms Figure 19 is intended to represent the impedance locus that would occur with a system impedance of 0 05 per unit and the voltage regulator out of service For this situation the impedance...

Page 12: ...settings would not have detected the smaller impedance locus shown in Figure 19 As a final point of interest it should be noted that while the simple graphical approach is an approximate procedure it does give a fairly good indication as to where the actual impedance locus will go As noted earlier the bisector of the 1200 angle between generator and system will go through the impedance locus for E...

Page 13: ... test AC relays properly i t is essential to use a sine wave of current and or voltage The purity of the sine wave i e its freedom from harmonics cannot be expressed as a finite number for any particular relay however any relay using tuned circuits R L or RC networks or saturating electromagnets such as time overcurrent relays would be essentially affected by non sinusoidal waveforms Similarly rel...

Page 14: ...ase and relay against the internal connection diagram for the relay Figure 3 6 ELECTRICAL TESTS All electrical tests must be performed with the relay in its own case or an equivalent steel test case Connect the relay per the test circuit diagram of Figure 7 and Table VII Note TABLE VII Connect lead A to stud 17 Connect lead B to stud 18 Connect lead C to stud 7 Connect lead D to stud 10 Jumper stu...

Page 15: ... 60 amperes very quickly and note that the left contact remains closed period of tine because it will overheat and possibly damage the unit Do not apply this current for too long a Reduce the current to 0 and remove the voltage from studs 17 and 18 Place a jumper across 17 and 18 Note that left contact opens Again increase the current from 0 to 60 amperes and note that the left contact remains ope...

Page 16: ...s of current set the phase angle listed then increase the current The unit should operate between the values listed under Current Pickup TABLE IX Offset Tap Ohmic Reach Phase Angle Lead Applied Voltage Current Pickup 0 N 0 0 2700 20 V 18 22 18 22 18 22 14 5 16 5 0 5 2 1 0 2 2 5 n 4 0 2 1 0 2 2 0 2 5 0 2 8 0 2 40 V 270 100 V 120 V 2700 270 Refer to the section on SERVICING if any of these tests do ...

Page 17: ...nts of the contacts proceed as follows 1 Remove one of the screws on the left hand plate front view Place this screw into the desired tap on the right hand plate tap plate front view Remove the screw from the undesired tap and put it in the left hand plate Restraint Transformer 2 3 The offset transactor lead H L should be connected to 0 on the offset block Apply 100 volts rated frequency to studs ...

Page 18: ...p times be checked on an electronic timer and an initiating switch with a minimum of timing error between the two poles Pickup voltage is defined as the DC voltage gradually applied that causes the telephone relay armature to pick up and seal in against the pole piece Pickup time is defined as the time interval between the energization of the telephone relay and the closing of an a normally open c...

Page 19: ...direction 90o lead and in the reverse direction 2700 lead ordinarily stated in ohms phase to neutral but the test circuit will test for a phase to phase ohmic reach This will be equal to two times the phase to neutral ohmic reach These values are Connect the relay per the test circuit of Figure 7 and Table VII The following equation will determine the current operating pickup Applied Voltage ohmic...

Page 20: ...current as possible to a maximum of 20 amperes INSTALLATION PROCEDURE INSPECTION Inspect all parts and components of the relay as described under ACCEPTANCE TESTS Check the nameplate information against the purchase order Check the fingers and shorting bars in relay and relay case against the internal connection diagram Figure 3 LOCATION The relay should be installed in a clean and dry location fr...

Page 21: ...cratches are left yet i t will rapidly points of contact kind to clean fine silver contacts be obtained from the factory This consists of an etched roughened strip of flexible metal The polishing action is so delicate that no clean off any corrosion thoroughly and The flexibility of the tool insures the cleaning of the actual Never use knives files or abrasive paper or cloth of any A burnishing to...

Page 22: ...21 rheostat is not objectionable to use the X21 reactor if necessary the lower rheostat located on the mounting plate just to the left of the mho unit The X21 reactor is located above the unit on the right side of the mounting plate Additional Reach Taps There are no adjustments for the two additional reach taps Their accuracy is dependent on the accuracy of the previously mentioned reach adjustme...

Page 23: ...SETTINGS Figures 14 15 and 16 show the effect on the unit s characteristic of moving the offset tap from 4 ft to 2 5 ft 1 0 ft and 0 5 ft The angle of maximum torque varied from 90 lead to 980 lead as the offset tap moved from 4 ft down to 0 5 ft The effect of ballooning of the characteristic is shown in the reverse direction as the offset taps are moved from the highest tap to the lowest tap The ...

Page 24: ... meet the calibration limits RENEWAL PARTS I t is recommended that sufficient quantities of renewal parts be carried 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 wanted and complete model number of the relay for which the part i...

Page 25: ...I I If n O 1 ia j l T OFFSET TAP BLOCK SB 5S Wv3 c i i 1 i j J R 63 X 21 i V J t v S A f is ti RESTRAINT TRANSFORMER E r m 4 OkiMi m n W a m L K I Ifill 1 1 i MOVING CONTACTS R 11 j fl i J A y R 21 I 1 MHO UNIT I i J 44 H i m i T jy JF53 Figure 1 8043152 Type GSY51A Relay Out of the Case Front View Nameplate Removed 25 Courtesy of NationalSwitchgear com ...

Page 26: ...5441 w y NX v Nfo v Hl G TARGET SEAL IN Rl OfFSET TAP BLOCK R3 R5 R R2 R 4 REACH TAP LINKS Figure 2 8043153 Type GSY51A Relay Out of the Case Rear View Nameplate Removed 26 Courtesy of NationalSwitchgear com ...

Page 27: ...M NUMBER MODEL 12 GSY5 IARA 2 1 3 120 120 120 VOLTS HERTZ 60 50 50 RESISTANCE IN OHMS 1200 1200 X Xl X2 X4 X5 COIL 200 800 X3 C0IL 800 800 2000 4000 2000 R3 2500 5000 R Rt R2 R4 R 5 2500 2500 2500 2500 R63A R63 5000 500C 5000 1000 lOoo 1000 RH 2500 2500 25DO R 21 C DIODES lN 5 06 l CAPACITANCE VALUE 75uf 1 0uf 10 af CM Figure 3 0257A9608 2 Sh 1 and 2 Internal Connections Diagram for the GSY51A Rel...

Page 28: ...6EK 45441 Figure 4 0269A3045 0 Type GSY51A Relay Characteristic with Offset 28 Courtesy of NationalSwitchgear com ...

Page 29: ...RISTICS OF RELAY WITH VARIOUS TAP SETTING WHEN SET FOR 1 OHM OFFSET ALL VALUES ARE PHASE TO NEUTRAL OHMS Figure 5 0402A0978 0 Characteristic of the GSY51A Relay as the Restraint Transformer is Reduced 29 Courtesy of NationalSwitchgear com ...

Page 30: ...INAL BLOCK SHORTING BAR NOTE AFTER ENGAGING AUXILIARY BRUSH CONNECTING PLUG TRAVELS V4 INCH BEFORE ENGAGING THE MAIN BRUSH ON THE TERMINAL BLOCK Figure 6 8025039 Cross Section of Drawout Case and Cradle Blocks Showing the Auxiliary Brush and Shorting Bar 30 Courtesy of NationalSwitchgear com ...

Page 31: ...GEK 45441 0 1 0 2 0 3 0 I 2 VARIAC 3 PHASE SHIFTER Vm i V ft PHASE ANGLE METER Ammi i W J CURRENT CONTROL c Figure 7 0269A3000 0 Type GSY51A Mho Unit Test Circuit 31 Courtesy of NationalSwitchgear com ...

Page 32: ...GEK 45441 DC C RATED VOLTAGE STOP A D AND TIMFR FRECUENCY B Vm X START T s DC Figure 8 0246A3787 Telephone Relay Test Circuit 32 Courtesy of NationalSwitchgear com ...

Page 33: ...OPTIONAL ft f 37MM 0 468 t t 2S0MM V 9J875 s y O T s05 s DF MM 252MM 9 937 PANEL 171MM IILL 1 G 75 l98M 5 8 v342MM 13 500 18 7 781 i IG 4 HOLES S02MM 9 75 STUD CUT OUT V S t O 395MM 15 562 O 504MM 19 875 E lv 88MM 44MM 241MM ZJSOO 9 50 1 75 3 0 19MM wSSMM DRILL 3 THH0 FLNEn 54s 7 IW JFC6 S 500TYPICAL PANEL DRILLING FOR SUR PACE MOUNTiNGCFRONT VIEW 76MM i VIEW SHOWING ASSEMBLY OF HARDWARE FOR SURFA...

Page 34: ...o X cr CONNECT PTS FOR 120 VOLTS PHASE TO PHASE r 2 I ST CEXS7E OUT OF STEP BLINDER UNITS m X CD 7 i A LOWER BLINDER UNIT 5 I LU CO 3 CL 4 UPPER BLINDER UNIT B O cn o I cr 4 21M 2I5T 4 21M O TR cC Aneri O O CIRCUIT BREAKER 62 3 Li_ 3 AUXILIARY CONTACT a Li ft o TRIP COIL TC O z c 2 21ST 21M 2IM O u TR OP IU 3 WV i TV a 6 o DRAWINGS I O INTERNAL OUTLINE DEVICE CEX57E QJ 006209274 0269A3037 to 5 006...

Page 35: ...10 9 2IM m x a r 2IM cr T SON 12 SON M l m 3 CO 3 cn 13 I 14 Qj I 4 15 13 RELAY LOCATION Ol 2IM _SWING LOCUS R 4 K C3 X 4 H J O 14 2IM 2IM 2IM 2IM e 3 E D C zfiLXI 4 X ZZHX4 r X5 3 6 CD O c 3 6 12 O 2IM 21M 2IM 2IM 21M X6 3 X3 XI X 2 X 5 X4 CO S2 r a o 64V DO 124V DO 124V DO 124V DO 12 fV DO 12A DO 2 2 2 2 2 2 OJ 52 to r DC BUS 3 a 3 h o 3 R X DIAGRAM NOTE AI A2 BI B2 ARROWS SHOW DIRECTION OF IMPE...

Page 36: ...E B MAGNET COILS C WAVE WASHERS D OCTAGON NUT FOR CORE ADJUSTMENT E FLAT WASHER F CORE HOLD DOWN NUT HEXAGONJ r n x c D E F Figure 11 0208A3583 0 Core Adjustment of the Mho Unit in the GSY51A Relay 36 Courtesy of NationalSwitchgear com ...

Page 37: ...RING ADJUSTING RING MOVING CONTACTS UPPER CONTROL SPRING NORMALLY OPEN STATIONARY CONTACT NORMALLY CLOSED STATIONARY CONTACT Figure 12 8041447 Four Pole Induction Cup Unit Used in the GSY51A Relay 37 Courtesy of NationalSwitchgear com ...

Page 38: ...Cm w 340 180 O 0 I6 C 20 14C 4 0 120 I 2C c t 60 HZ TR 4NSF 50 SET 4T 3yv 0 N OFFSET 4_TL 0 N I 00 8 0 O 60 O 90 270 Figure 13 0269A3046 0 GSY51A Relay Calibration for 8 0 N Forward and 4 0 N Reverse Direction 38 Courtesy of NationalSwitchgear com ...

Page 39: ...TRAhlSF 50 UNIT 9 5 n 0 N4 90 LEAD OFFSET Z b_r _ 0 N 270 ACTUAL REACH 8 G n 0 N 2 45 n 0 N Figure 14 0269A3047 I GSY51A Relay Characteristic Check with 2 5 ft 0 N Offset Tap 39 Courtesy of NationalSwitchgear com ...

Page 40: ...0V 5A GOHZ TRANSF 5 0 UNIT II O a 90 LEAD OFFSET I On 0 N 270 ACTUAL REACH IO _a_ 0 N l 0_a_ 0 N Figure 15 0269A3048 GSY51A Relay Characteristic Check with 1 0ft 0 N Offset Tap 40 Courtesy of NationalSwitchgear com ...

Page 41: ...160 20 140 o 40 120 120 V 5 A 60H2 TRANSF 50 UNIT Il 5 _n_ 0 N 90 LEAD OFFSET 0 5 _ 2 N 270 I 00 80 ACTUAL REACH I0 3XL 0 N 4 9XL 0 N Figure 16 0269A3049 I GSY51A Relay Characteristic Check with 0 551 0 N Offset Tap 41 Courtesy of NationalSwitchgear com ...

Page 42: ... LEAD STEADY STATE CHARACTERISTIC DYNAMIC CHARACTERISTIC T MHO RESTRAINT TAP SETTING 3 THREE PHASE FAULT CURRENT 80 z h 70 i LLJ in 60 LLJ X 1 100 T 50 T 25 7o 50 Ll_ O 40 30 u LLJ cr 20 r IJJ 10 cc 6 10N BASIC 4rv0N1 MIN 2 vON IREACH 2 3 3 4 5 6 7 5 9 10 5 6 9 12 15 18 21 5 6 7 c 0 1 5 0 3 130 FAULT CURRENT IN AMPERES Figure 17 0257A6173 0 Steady State and Dynamic Curves for the GSY51A Relay 42 C...

Page 43: ...FFSET R F 5 GSY WHO UNIT 10 FORWARD REACH 10 Zs SYSTEM IMPEDANCE XT TRANSF REACTANCE X M GEN TRANSIENT REACTANCE Figure 18 0208A8542 0 Typical Settings for the CEX and GSY Relays 43 Courtesy of NationalSwitchgear com ...

Page 44: ...GEK 45441 R ZS SYSTEM IMPEDANCE Xj TRANSF REACTANCE X1 d GEN TRANSIENT REACTANCE Figure 19 0208A8543 0 Application of CEX GSY for Z System 0 05 P U 44 Courtesy of NationalSwitchgear com ...

Page 45: ...0 15 20 25 30 i 15 10 5 5 10 i 5 20 SECONDARY OHMS X Z5 SYSTEM IMPEDANCE XT TR ANSF REACTANCE X 1 d GEN TRANSIENT REACTANCE Figure 20 0208A8544 0 Application of CEX GSY for Z System 0 09 P U 45 Courtesy of NationalSwitchgear com ...

Page 46: ...I 10 IMPEDANCE LOCUS I 15 N 20 5 10 5 10 x SECONDARY OHMS Xs SYSTEM IMPEDANCE XT TRANS REACTANCE X d GEN TRANSIENT REACTANCE Figure 21 0208A8545 0 Application of CEX GSY for Z System 0 2 P U 46 Courtesy of NationalSwitchgear com ...

Page 47: ...X 10 5 R 10 15 20 10 5 SECONDARY OHMS X Z5 SYSTEM IMPEDANCE XT TRANSF REACTANCE X d GEN TRANSIENT REACTANCE Figure 22 0208A8546 0 Application of CEX GSY for Z System 0 4 P U 47 Courtesy of NationalSwitchgear com ...

Page 48: ...NCE XT TRANSFORMER REACTANCE X d GEN TRANSIENT REACTANCE Figure 23 0208A8547 0 Application of CEX GSY at High Voltage Terminals Z System 0 4 P U BC 10 96 150 GENERAL ELECTRIC CO POWER SYSTEMS MANAGEMENT BUSINESS DEPT MALVERN PA 19355 Courtesy of NationalSwitchgear com ...