Westinghouse Electric Corporation Relay-Instrument Division Newark Plant, Newark, NJ

Transcription

1 April, 1976 Supersedes DB B dated January, 1967 E, D, C/213/DB Westinghouse Eletri Corporation Relay-nstrument Division Newark Plant, Newark, NJ For Phase or Ground Fault Detetion Transmission Lines and Feeder Ciruits DWEA Desriptive Bulletin Page 1 Diretional Overurrent Relays Types RC, RP, RD, RQ, RV

2 Page2 Appliation Ground Relays- Current and/or Voltage Polarization The RP, RC and RD line of relays are ground diretional overurrent relays. The time overu rrent and instantaneous overu rrent units are diretionally ontrolled. The RC relays are u rrent polarized; RP relays are voltage polarized; and RD relays are dual polarized; that is, they an be polarized from a potential soure, from a loal ground soure or from both simultaneously. Ground Relays- Negative Sequene The type RQ line of relays have a diretional unit whih operates on negative sequene u rrent and voltage while the overurrent unit operates on residual or ground urrent. Negative sequene filters onneted between the diretional unit and the urrent and voltage transformers supply the negative sequene urrent and voltage. RQ relays are intended for use at loations where present equipment or system onditions do not permit the use of onventional types of diretional ground relays operating entirely on residual urrent and voltage. A typial appliation of RQ relays would be at an ungrounded substation on a grounded system where only two voltage transformers are available or where the potential transformers are on the low side of a wye-delta or delta-wye power transformer bank. Phase Relays The RV line of relays are phase diretional overurrent relays. The time overurrent and instantaneous overurrent units are diretionally ontrolled RV relays are polarized by positive sequene phase-to-phase voltage. Seletor Guide Protetion Diretional Time Charateristis Unit Short Long Polarization Phase Fault Voltage polarized by RV-2 RV-5 Detetion system line-to-line voltage Ground Fault Current Polarized RC-2 RC-5 Detetion by residual urrent Voltage Polarized by RP-2 RP-5 residual voltage Voltage and/or Current Polarized by voltage soure,or RD-2 RD-5 loal ground urrent soure; or both simultaneously Voltage and urrent Polarized R-2 R-5 by negative sequene voltage and urrent Definite Moderately nverse nverse RV-6 RV-7 RV-8 RC-6 RC-7 RC-8 RP-6 RP-7 RP-8 RD-6 RD-7 RD-8 R-6 R-7 R-8 Constrution nternal Wiring Settings Performane Curves External Wiring Charateristis Very nverse RV-9 RC-9 RP-9 RD-9 Extremely nverse R-9 RV-11 RC-11 RP-11 RD-11 R-11 Flexitest Case Type FT-31 FT-31 FT-31 FT-41 FT-42 Page 3, 4 5, Devie Number 67

3 Cl Constrution (1) nstantaneous Overurrent Unit () RC, RP, RD, RQ Ground Relays This unit is a produt type indution ylinder operating as a result of the interation of two out-of-phase air gap fluxes. The unit is free of vibrations at heavy urrents and provides fast, trouble-free reliable operation. Eah of the two pairs of pole windings are energized by ground urrent from the operating iruit. A apaitor is series-onneted with one pair of pole windings to obtain the desired time-phase relationship between the urrent in the two pairs of oils in order to develop the neessary rotational torque. As shown in figures 5, 6, 7 and 9, the normally losed ontat of the diretional unit is onneted aross one pair of pole windings of the instantaneous overurrent unit. This ontat shunts the operating urrent around the pole windings, preventing the instantaneous overurrent unit from devel oping rotational torque. Under fault onditions, the short on the in DWEA Desriptive Bulletin Page3 stantaneous overu rrent unit oils is removed, allowing the unit to ommene losing its ontats almost simultaneously with the diretional unit ontat, providing high speed operation. A saturating transformer, having taps on its primary winding, is used to feed the instantaneous overurrent unit. Tap value urrent is the minimum urrent required to just lose the relay ontats. Use of the tapped transformer supplies the same amount of energy to the overurrent unit for any tap setting at any given multiple of tap urrent. Consequently, the unit has a onstant burden and torque level throughout its entire range, as well as one time urve for the full range. See figure 11. A non-linear resistor (Varistor) onneted aross the seondary winding of the transformer and overurrent unit oils redues the voltage peaks applied to the phase shifting apaitor and the overurrent unit.

4 Page4 RV Phase Relay The design of the instantaneous overurrent unit of the RV phase relay is similar to the ground relays exept it reeives its energy from the phase urrent transformers. Also, as shown in figure 8, the apaitor phase shifting iruit is ontrolled by the normally open ontat of the diretional unit. This ontat also ontrols operation of the CS-1 auxiliary swith whih in turn torque-ontrols the time overu rrent unit. (2) Zero Sequene Current Polarized Diretional Unit ( D) (3) Zero Sequene Voltage Polarized Diretional Unit (D) (4) Negative Sequene (Current and Voltage) Polarized Diretional Unit ( D) The diretional unit is also a produt type indution ylinder unit similar in onstrution to the instantaneous overurrent unit. The eletromagnet has two series-onneted operating oils mounted opposite to eah other. nteration of the fluxes generated results in rotation of the ylinder. The diretional unit requires no settings. Refer to Figures 1, 12 and 13 for operating time values. (5) Time Overurrent Unit (CO) a i.llt to Figure3 e h A main tapped oil is plaed in the enter leg of an "E" type laminated magneti struture on types -5, -6, -7, -8, and -9. Flux produed by this oil returns through the two outer legs of the eletromagnet. A shading oil on the left leg of the eletromagnet reates an out-ofphase flux whih reats with the main oil flux in the air gap of the eletromagnet to ause dis rotation in the ontat losing diretion. f d g Eletromagnet for types -2 and -11 are similar in onstrution, exept both outer legs have windings to produe the neessary out-ofphase fluxes required for ontat-losing rotational torque. a. Tap Blok ndiates minimum urrent required to just lose the relay ontats. b. Tap Srew Two supplied. When hanging taps, the spare is inserted into the new position prior to removal of the previous setting tap srew. This prevents open iruiting of the assoiated urrent transformers.. Magneti Plugs May be srewed into or out of the magneti iruit to ontrol saturation and to adjust alibration at high urrents. Damping magnet and spring adjustments permits alibration at low urrents. d. Time Dial ndiates initial position of the moving ontat over a 27 range. ndexed positions from Y, (minimum time) to 11 (maximum time). e. Stationary Contat Made of pure silver. Will lose 3 amperes at 25 volts de. Has suffiient wipe to assure positive ontat. n fast breaker relosing shemes whih require quik-opening relay ontats, the meal plate is reversed, holding the stationary ontat fixed against the bakstop. On double trip relays, adjustment of 1/s4' (.3969 mm) ontat follow or "wipe" is obtained by use of a vernier adjusting srew on the stationary ontat plate. f. Moving Contat Also pure silver. t is lamped to the insulated setion of the indution dis shaft. Contats will lose 3 amperes at 25 volts de. g. Damping Magnet A high strength Alnio damping magnet is used to ontrol operating time of the relay at low urrent values. h. ndution Dis Spiral shaped to ompensate for the spring windup through out moving ontat travel, i.e., provides aurate pikup at any dis position. i. Spring Adjuster Used to set the minimum trip urrent of the relay, and to provide in-between tap pikup adjustment, when desired. (6) ndiating Contator Swith (CS) (Partially Disassembled) Figure4 J De operated. Has a lapper type magneti armature to whih leaf-spring ontats are attahed. When energized, the moving ontats bridge the stationary ontats, ompleting the trip iruit. The CS ontats are onneted in parallel with the main relay ontats, relieving them of arrying heavy trip urrents. During operation, an operation indiator target drops. The target is orange olor, and highly visible. Taps on the front of the unit provide onnetion for either.2 (left) or 2. (right) amperes de pikup operation. When using a 125 or 25 volt de auxiliary WL relay, the.2 amp tap is reommended. The 2. amp tap is used on 24 or 48 volt de iruits. (7) Negative Sequene Filter This filter is fed by negative sequene urrent and negative sequene voltage, and onsists of reators and resistors onneted as shown in figure 9. (RQ relays only.) (8) Auxiliary Swith (CS-1) Small solenoid de swith. A tapped resistor is used to allow the use of CS-1 on 24, 28, 125, or 25 Vd systems. Operation of CS-1 is ontrolled by the diretional unit (D) whih in turn diretionally ontrols the time overurrent unit (CO). When suffiient power is flowing in the trip diretion, CS-1 will operate and permit the time overurrent unit to operate. The RV relays have a seond ontat on the CS-1 unit whih will seal in the oil through the break ontat of the unit. This relieves the make ontat of the diretional unit (D) from arrying the CS-1 oil urrent. The break ontat of the D unit breaks this seal-in by shorting the CS-1 oil. The break ontat of the instantaneous overurrent unit () also breaks the seal-in of the CS-1 oil to prevent tripping on reversed faults where the diretional unit was prelosed on load urrent.

5 Cl nternal Wiring (Front View) RC-2, RC-5. RC-6. RC-7, RC-8. RC-9. RC- 11 for Ground Fault Detetion CD (FT-31 Case), ,r:::: - nstantaneous Overurrent Unit (Upper Cylinder Unit) r.:--+-!--!--- Saturating Transformer DWEA Desriptive Bulletin Page 5 RP-2. RP-5. RP-6, RP-7. RP-8, RP-9. RP- 11 for Ground Fault Detetion CD (FT-31 Case) JC::::;-!--- nstantaneous Overurrent Unit (Upper Cylinder Unit) "---- Saturating Transformer Figure 5 184A34 (Sub. 5) Figure 6 184A33 (Sub 5) RD-2, RD-5. RD-6. RD-7. RD-8. RD-9. RD- 11 for Ground Fault DetetionCD (FT-41 Case) Diretional Contats,...-,.-----o...':--- (Middle Unit),-----!!-+---nstantaneous Overurrent Unit (Upper Cylinder Unit) -+-'!--- Saturating Transformer l+..l::.: =-++-f--- Diretional Contats + (Lower Unit) RV-2. RV-5, RV-6. RV-7, RV-8. RV-9. RV- 11 for Phase Fault Detetion CD (FT-31 Case),.----;.::;:::;:::;:=:.;--- nstantaneous + Overurrent Unit (Upper Cylinder Unit) -H--- Saturating Transformer Figure 7 184A2 (Sub 7) Figure 8 185A421 (Sub 3) CD With nstantaneous Polarity os Shown (+), Open Diretional Contats Close.

6 PageS RQ-2, RQ-5, RQ-6, RQ-7, RQ-8, RQ-9, RQ-11 for Ground Fault Detetion (FT-42 Case) Auto Transformer nstantaneous Overurrent Unit ---+"""T (Upper Unit) Saturating Transformer === ndiating Contator Swith --+-+\ (Right) ndiating Contator Swith (Left) Figure 9 Phase2 Phase , i Diretional Unit ;;;i;,...o)i.,.._;--!-- (Middle Unit),-!-7-!---!--- ndution Unit (Bottom Unit) Varistor l Auxiliary Swith 185A96 (Sub. 2) Relay Settings The instantaneous and time-overurrent units require setting, whereas the diretional unit does not. On both overurrent units, the tap seleted determines the minimum pikup or ontatlosing urrent of the unit. Seletive time dial settings on the time-overurrent unit an be determined by referring to the time urrent urves in the appropriate nstrution Leaflet. CS-1 Coil Operating Time Operating time of the CS-1 auxiliary swith is approximately 5 milliseonds. CS-1 Coil Resistane ( Ohms) 1165 ohms for 24/48/125/25 volt rei ays exept the 24 volt RV whih has a 1 1 ohm oil.

7 Typial Time Curves RC, RD. RP Diretional Unit (/) " " () ::2 3 s () E t= 2 Q..:: Current Polarized Operating and Polarizing Currents Applied in Phase, 2 Ampere Tap Setting. Voltage Polarized Current Applied in Phase with Voltage, 2 Ampere Tap Setting DWEA Desriptive Bulletin 1 ().1 2.Volts f- 1 Volts 5. Volts Volts Amperes Figure ,4716 ::---- RC, RP, RD, RQ, RV nstantaneous Overurrent Unit Negative Sequene Amperes (/) " " () ::2 3 s 2 () E t= 1 Figure 11 2 RV Diretional Unit (/) " " () :: s 4 () E i= Sale 1 Sale 2 Figure Multiples of Tap Value Current For Current Applied in Phase with Voltage Sale 1 For Amps and 2-6 Amps Relay Sale 2: For 4-12 Amps Relay Amperes A946 5 Volts 25 Volts ---L1 >OVo''" Page 7 RQ Diretional Unit (/) ".14 " () (/).12 Figure 13 Sensitivity Curve RQ Diretional Unit LL E 8 7 "' 6 '> a- > Bl 6..E.,- - "' 5 " :J () 4.,z :J o-- "' () (/) Ol () z A947 Figure 14 Contat Gap Approximately.2 nh Negative Sequene nput Voltage to Filter (Line to Neutral Base).5 Volts 1.Volts nputs to Filters Current Applied at Maximum Torque Angle Contats Close for Voltages and Currents Above and to Right of the Curve 184A Amperes Negative Sequene Amperes nput to Filters 5 184A996

8 PageS External Wiring Type RC for Ground Fault Detetion Station Bus l l } Phase { Relays n Polarizing i:5 > a. a. i!: 1 o -=- Neutral of Ground Current Soure Figure (Sub. 2) Type RP for Ground Fault Detetion Station Bus l --- l i:5 > a. a. i!: ],..._._..._, Figure 16 Type RD for Ground Fault Detetion Station Bus r ! Main Potential '--::b-----<-±: Transformer Polarizing Voltage (Sub. 3) l , i:5 > a. a. i!: l Figure 17 r+---} :: { =F-- F---Hii Main p Neutral of Ground Current Soure When Not Used,.../' Jumper Terminals 4and 5 Potential ' Transformer....(J Polarizing Voltage Transformer (Sub. 2) Devie Number Chart (Figures 1 5, 1 6, 17) -Diretional Overurrent Relay, Type RC, RD, or RP D -Diretional Unit D/U -Upper Diretional Unit D/L -Lower Diretional Unit o -Time-Overurrent Unit -lnstantaneous-overurrent Unit 1/ST -Saturating Transformer for lnstantaneous-overurrent Unit CS -ndiating Contator Swith CS-1 -Auxiliary Contator Swith 52 -Power Ciruit Breaker 52 a -Breaker Auxiliary Contat 52TC-Breaker Trip Coil lo -Operating Current lp -Polarizing Current Note: Figure 16 de trip bus iruit applies to Figure 1 5 as well. Positive D li r ip B u s _.:. _ 1 CS T De Trip Bus list Se. Positive : D 1/ST Se.

9 External Wiring, Continued Type RQ for Ground Fault Detetion :., > : a. a. 1 Station Bus "--y-1 Devie Number Chart Phase Rotation 1, 2,3 Other Relays -Diretional Overurrent Negative Sequene Ground Relay, Type RQ D -Diretional Unit -lnstantaneous-overurrent Unit Figure A. o -Time-Overurrent Unit 1/ST -Saturating Transformer for nstantaneous Overurrent Unit CS -ndiating Contator Swith B DWEA Desriptive Bulletin Page 9 DTrip Bus Positive -''""""--- CH _.\ a 2_ l. 5 _1 Other Relays RH *L--s-_1 /ST Se_ }o V2 (Referene) -* ''3j Contat \ Closes 1 Diretional Unit Phose Angle Charateristis Alternate Connetion (Neutral Formed Externally) CS-1 -Auxiliary Contator Swith 52 -Power Ciruit Breaker 52a -Breaker Auxiliary Contat 52TC-Breaker Trip Coil (Sub 4)

10 Page 1 External Wiring, Continued Types RV and RD for Phase and Ground Fault Detetion : "'. a. ie j Phasel Phase Devie Number Chart list list list D 7 D 7 8 Phasel Phase 2 Phase 3 Ground 67 -Phase Diretional Overurrent Relay. Type RV -Ground Diretional Overurrent Relay, Type RD, lo -lnstantaneous-overurrent Unit Figure 19 o D Do CS-1 CS-T CS-1 Auxiliary Potential Transformer -Time-Overurrent Unit -Diretional Unit -Auxiliary Swith -ndiating Contator Swithes 1/ST a 52TC Transformer Bank Neutral 6 ;: _ DO/u _ - Phase 1,,g lphasor Rotation 3 l2 j v Phasors at 1% P.F. Power in Tripping Diretion V2 3 Phase 2 Relay -Saturating Transformer for nstantaneous Overurrent Unit -Power Ciruit Breaker -Breaker Auxiliary Contat -Breaker Trip Coil (Sub 3)

11 -- Charateristis: RC, RP, RD, RV Burden Data and Thermal Capaities, nstantaneous- Overurrent Unit () Ratings Range Amps Range Amps Continuous 1-Seond CD Continuous s s SeondCD G) Thermal apaities for short times other than 1 seond may be alulated on the basis of time being inversely proportional to the square of the urrent. Volt-Ampere Burden See lnstr. Leaflets and Burden Data and Thermal Capaities, Diretional Unit (D) (a) Polarizing Ciruit Relay Burden in Volt-Amps RC 1.45 RP 11.2 RD (Current Unit) 1.45 RD (Voltage Unit) 11.2 RV 12.5 P.F. Angle so Lag 2So Lead so Lag 2So Lead 15' Lead Rating Continuous 12 Volts 12Volts 132 Volts CD Voltages taken with Retox type voltmeter. Degrees urrent lags or leads voltage@ 12 Von voltage polarized units &@ 5 A on urrent polarized units. 1 seond rating is 345 Volts Seond - -"-'-'-' Seond 23Amp 23 Amp 2SVolts 2SVolts (b) Operating iruit, See nstrution Leaflets for RC, RD, RP relays & for RV relays. () Diretional Unit Sensitivity Relay Type Tap Range in Amps - RC, RD 2 6 Current 4-12 Unit RP, RD 2-6 Voltage 4-12 Unit RV Voltage 2-6 Unit 4-12 Minimum - Pikup Volts Amps _ s 2_ Phase Angle 1 leading l p by 4 in phase 1 leading l p by 4 in phase lagging V by 6 in phase with V lagging V by 6 in phase wi!_ leading V by 3 in phase with V leading V by 3 in phase with V 41-13B DWEA Desriptive Bulletin Page 11

12 DWEA Desriptive Bulletin Page 12 Charateristis: RQ CD Burden data for the Sequene Filter and the Diretional Unit A. Current Burden at 6 hertz Phase Continuous 1-Seond : R -" a '-' t "' ing, A -' m=p: s :R::ating, Amps Watts at 5Amps Positive Sequene Current Applied (no output urrent to the diretional unit) Zero Sequene Currents Applied Volt-Amperes at 5Amps B. Voltage Burden at 6 hertz Positive Sequene Currents Applied, See L C. nstantaneous Overurrent Unit Operating Current Ciruit- 6 hertz Range Continuous Rating (Amperes) One Seond Rating t mperes_) T Thermal apaities for short times other than one seond may be alulated on the basis of time being inversely proportional to the square of the urrent. CD Charateristis apply to omplete RQ relay, not to individual units. Shipping Weights and Carton Dimensions Relay Type Flexitest Weight: Pounds (kg) Case Type Net Shipping - RC FT (14.5) RP FT-31 23(1.4) RD FT (12.2) RV FT (11.8) RQ FT (13.2) Westinghouse Eletri Corporation Relay-nstrument Division Newark Plant, Newark, N.J. 3 (13.6) 3 (13.6) 34 (15.4) 33 (14.9) 36(16 3) Power Fator Angle Domesti Shipping Carton Dimensions: nhes (em) 8x1x21 (2.3x25.4x53.3) 8x lox 21 (2.3 x 25.4x 53.3) 8x 1x21 (2.3x25.4x61) 8 X 1 X 21 (2.3 X 25.4 X 53.3) 8x1x21 (2.3x25.4x61) """'

13 July, 1987 Supersedes Desriptive Bulletin A dated June, 1969 Mailed to: E, D, C/41-4A Appliation Types CR, CRC, CRP, CRD These relays are used to disonnet transmission and feeder iruits when the urrent through them in a given diretion exeeds a predetermined value. Seletor Guide Westinghouse Eletri Corporation Relay and Teleommuniations Division Coral Springs, FL 3365 For Phase and Ground Fault Detetion On Transmission Lines And Feeder Ciruits Type CRQ Type CRQ This relay provides overurrent ground detetion. The diretional unit operates on negative sequene urrent and voltage, and the overurrent unit operates on residual or ground urrent. Desriptive Bulletin 41-13A Page 1 Diretional Overurrent Relays Types CR, CRC, CRP, CRD, CRO The CRQ is appliable for ground protetion at an ungrounded substation on grounded systems where only two potential transformers are available, or where the potential transformers are on the delta side of a wyedelta or delta-wye power transformer bank. Protetton Diretional Ttme Charatenstt Flex1test Devte Desired Unit ,-- - Case Number Polarization Short Long Definite Moderately nverse Very Extremely Type nverse nverse nverse - - Phase Voltage Polarized CR-2 CR- 5 CR- 6 CR-7 CR-8 CR- 9 CR-1 1 FT Fault By SysteiT' Detetion Lme-To-Line Voltage , Ground Current Polarized CRC-2 CRC- 5 CRC- 6 CRC-7 CRC-8 CRC- 9 CRC-1 1 FT N Fault By Residual Current Detetion Voltage Polarized CRP-2 CRP- 5 CRP- 6 CRP-7 CRP-8 CRP- 9 CRP-1 1 FT N By Residual Voltage r r Voltage And/Or CRD-2 CRD-5 CRD- 6 CRD-7 CRD-8 CRD- 9 CRD- 1 1 FT N Current Polarized By Voltage Soure, Or Loal Ground Current Soure, Or Both Simultaneously Voltage And Current CR-2 CR- 5 CR- 6 CR-7 CR-8 CR- 9 CR 1 1 FT N Polarized By Negative Sequene Voltage and Current

14 Desriptive Bulletin 41-13A Page 2 Constrution and Operation Type CR-9 Fig. 1 Diretional Unit (D) ndution ylinder type unit. Operates on the interation between the polarizing iruit flux and the operating iruit flux. At 2 amperes operating urrent with 12 volts, 6 hertz applied, the operate time of this unit is approximately 1 milliseonds. Q Overurrent Unit (CO) The eletromagnets for these relays have a main tapped oil loated on the enter leg of an "E" type laminated struture that produes a flux whih divides and returns through the outer legs. A shading oil auses the flux through the left teg to lag the main Type CRD-8 Fig. 2 Upper Diretional Unit (D) (Current Polarized) Lower Diretional Unit (D) (Voltage Polarized) Time Overurrent Unit (CO) pole flux. The out-of-phase fluxes produed in the air gap ause a ontat losing torque. e Time Dial ndiates initial position of the moving ontat over a 27' range. t is indexed from position % (minimum time) to position 11 (maximum time). Damping Magnet ndution Dis ndiating Contator Swith {CS) De operated. A target drops to indiate a tripping operation. Type CRQ-9 Fig. 3 Taps on the front of the unit provide onnetion for either.2 (left) or 2. (right) amperes de pikup operation. When using a 1 25 or 25 volt de auxiliary WL swith, the.2 ampere tap is used. The 2. ampere tap is used on 24 or 48 volt de iruits. ndiating nstantaneous Trip A operated and adjustable over a range of 1 to 4 times minimum pikup. Negative Sequene Filter The urrent and voltage filters onsist of reators and resistors onneted together as shown in the figures 13 & 14. July, 1987

15 Operation Charateristi Time Curve Seletion When the generation is fixed at a onstant value and fault urrent variation is primarily due to the loation of the fault along a line, the seletion of a relay with a more inverse time harateristi is desirable to obtain seletive oordination with adjaent relays. When the generation flutuats within large limits suh as day time peak and night time low, the tripping time of a relay with an inverse harateristi beomes too dependent on the magnitude of the fault urrent to permit a smooth oordination so that the relay with definite minimum time is the preferred hoie. Settings Tap Range Taps Available The urrent range seleted depends upon the fault urrent available at the proteted line, as determined by a system study. The lower tap range ( amperes) is usually applied for ground fault protetion, sine phase faults result in higher fault urrents requiring 2-6 or 4-12 amp range. Example of Settings For A Loop Protetion Figure 4 illustrates a loop system with one generating station equipped with overurrent relays and four substations equipped with diretional overurrent relays. Arrows indiate the diretion overurrent must flow to trip the relays, and the time values represent the operating time of the relays as determined by the time dial position. Considering a fault at M, urrent will flow to the fault from substations B and C. The.35 seond relay will trip at substation C and the.85 seond relay will trip at substation B. While the same fault urrent flows through the.6 seond relay at station D, Fig. 4 - Overurrent Relays, Type CO Desriptive Bulletin 41-13A and the.85 seond relay at station E, the.35 seond relay at station C will operate and lose its ontats before the.6 relay at D, or the.85 relay at E an trip Time Dial Time dial settings determine the operating time of the relay. The effet of the time dial adjustment is shown on the urves in Performane Data Spring Adjuster By rotation of the spring adjuster. it is possible to obtain ontinuous pikup urrent values between the tap settings, thus permitting a preise time oordination. A -Central Stat1on \ -Diretional Overurrent Relays, Type CR. Arrow shows tnpping diret1on. nternal Wiring Diagrams (Front View) W1th Relative nstantaneous Polanty as shown the Dlfet1onal Un1t Contats lose CR-2. CR-5, CR-6, CR-7, CR-8, CR-9, CR-11 Phase Relay With lit, Spst, FT-21 Case Fig. 5 July, 1987,._ Chassis Operated Shorting Swith CR-2. CR-5, CR-6, CR-7, CR-8, CR-9, CR-11 Phase Relay, Dpst, FT-21 Case Fig Page 3 1.1

16 Desriptive Bulletin 41-13A Page 4 nternal Wiring Diagrams (Front View) With Relative nstantaneous Polarity as shown the Diretional Unit Contats lose. CRC-2. CRC-5. CRC-6, CRC-7, CRC-8. CRC-9, CRC-11 Ground Relay With lit, Spst, FT-21 Case 8'" ndution Unit 1,---1, Current Test Jak l 1'--l--- Flexitest Swith -'--lr--- Chassis Operated Shorting Swith l-+--- Case Terminals Fig CRD-2, CRD-5. CRD-6, CRD-7, CRD-8, CRD-9, CRD-11 With lit; Spst. FT-31 Case Fig. 11 ndiating Contator Swith Upper Diretional Unit ""l -1--t--- ndution Unit ' Lower Diretional Unit Lower Diretional Unit ndiating nstantaneous Unit., Chassis Operated Shorting Swith ' Case Terminals CRC-2, CRC-5, CRC-6. CRC-7, CRC-8. CRC-9. CRC-11 Ground Relay, Dpst, FT-21 Case lr Current Test Jak l :! Flexitest Swith ,.. J+---- Chassis Operated Shorting Swith J--t---- Case Terminals CRD-2, CRD-5. CRD-6. CRD-7. CRD-8. CRD-9, CRD-11, Dpst, FT-31 Case,.-----,;;.;;;::;;;::;;;::;;;::;;;::::;:::;::=:;--- ndiating Fig Contator Swith Upper Diretional Unit ndution Unit Lower Diretional Unit Lower Diretional Unit Chassis Operated Shorting Swith Case Terminals July, 1987

17 CRP-2, CRP-5, CRP-6, CRP-7, CRP-8, CRP-9, CRP-11 Ground Relay With lit, Spst, FT-21 Case r.=;:=====:;- ;1---- ndiating Contator Swith : ndution Unit l"' Chassis Operated Shorting Swith }-+--- Case Terminals Fig CR-2, CR-5, CR-6, CR-7, CR-8, CR-9, CR-11 With lit, Spst. FT-42 Case C--+F Reator L ndution Unit {lower Unit).._ '-...::; Diretiona Unit {Upper Unit) ' ndution Unit {Lower Unit) \...!:::=:::;;;=:1;::;;;;;==: ndiating Contator Swith,-1-,...,++...,.Lr Mutual Reator Fig A966 July, 1987 CRP-2, CRP-5, CRP-6, CRP-7. CRP-8. CRP-9, CRP-11 Ground Relay, Dpst, FT-21 Case Desriptive Bulletin 41-13A Fig CR-2, CR-5, CR-6. CR-7, CR-8, CR-9, CR-11, Dpdt, FT-42 Case Fig Phase 2 12 > Reator lr+----f--- Diretional Unit (Upper Unit) '> ndution Unit (Lower Unit) A964 Page 5

18 Desriptive Bulletin 41-13A Page 6 Charateristis Time The time harateristis of the time overurrent relays are designated by speifi numbers: Charateristi Short Time Long Time Definite Time Moderately nverse Time. nverse Time Very nverse Time Extremely nverse Time Number The relays are generally available in the following overurrent unit urrent ranges: Range Taps Relays may have either single or double iruit losing ontats for tripping either one or two iruit breakers. ndiating nstantaneous Trip (lit) Relays are available with T units having the following urrent ranges amp 1-4 amps 2-8 amps 4-16 amps 1-4 amps 2-8 amps 4-16 amps The operating time of this unit is approximately one yle at 3 times pikup setting. Trip Ciruit The main ontats will safely lose 3 amperes at 25 volts de, and the seal-in ontats of the (CS) Negative Sequene Diretional Unit Sensitivity Curve :; Q) z f Q) :.J u: f Q) Ol > :;. Q) '-' Q) :::J :r Q) CJ) Q) > - ro Ol Q) z Fig Current Applied At Maximum Torque Angle Contats Close For Voltages And Currents Above And To Right Of The Curve Negative Sequene Amperes nput To Filters ndiating Contator Swith will safely arry this urrent long enough to trip a iruit breaker. The T Contats also will arry 3 amperes at 25 volts de and arry this urrent long enough to trip a iruit breaker. 8 "' ' '-' Q) CJ) Q) E i= 184A996 Fig Trip-Ciruit Constants ndiating Contator Swith.2 amp tap -6.5 ohms de resistane 2. amp tap-.15 ohms de resistane Diretional Unit (D) CR Relay This voltage polarized relay is intended for phase fault protetion The diretional unit has its maximum torque when the urrent leads the voltage by approximately 3 '.The diretional unit minimum pikup is 1 volt and 4 amperes at its maximum torque angle for the 4 to 12 ampere range relays, and 1 volt and 2 amperes for the 2 to 6 ampere and.5 to 2.5 ampere range relays. The diretional unit should be onneted using the urrent in one-phase wire, and the potential aross the other two-phase wires. This onnetion is ommonly referred to as the 9' onnetion. When utilizing the 9' onnetion, the maximum torque of the relay ours when the fault urrent lags its 1% power fator position by approximately 6' See Figure 17. Negative Sequene Diretional Unit Time Curve 5 Contat Gap Approximately.2 nh Negative Sequene nput Voltage To Filter (line To Neutral Base) Negative Sequene Amperes nput To Filter 4 184A995 July, 1987

19 CRC Relay Current polarized, this relay is intended for ground fault protetion, and operates on residual urrent. See Figure 18. The type CRC has its maximum torque when the operating urrent leads the polarizing urrent by approximately 4. The diretional unit minimum pikup is.5 ampere in eah winding in phase for the.5 to 2.5 ampere and the 2 to 6 ampere range relays. CRP Relay This voltage polarized relay is intended for ground fault protetion and has its maximum torque when the urrent lags the voltage by approximately 6. The shifting of the maximum torque angle is aomplished by the use of an internally mounted phase shifter as illustrated in Figure 1. The CRP operates on residual voltage and residual urrent. See Figure 19. The diretional unit minimum pikup is 1 volt and 2 amperes at its maximum torque angle for the.5 to 2.5 ampere and the 2 to 6 ampere range relays. CRD Relay Dual polarized, the CRD is intended for ground fault protetion. t an be polarized from a potential soure, from a loal ground soure, or from both simultaneously. The CRD utilizes the diretional unit of the Type CRC in onjuntion with the diretional unit and phase shifting mehanism of the CRP. The diretional ontats are onneted in parallel to torque ontrol a ommon overurrent unit. See Figure 12. The urrent-polarized diretional unit of the CRD operates on residual urrents, while the potential polarized diretional unit operates on residual voltage and See Figure 2. residual urrent. For the.5 to 2.5 ampere and the 2 to 6 ampere range relays, the minimum pikup of the urrent polarized unit is.5 ampere in eah winding in-phase, and the minimum pikup for the voltage polarized unit is 1 volt and 2 amperes with the urrent voltage by 6. CRQ Relay lagging The diretional unit minimum pikup is approximately.76 volt-amperes (e.g..19 volt and 4 amperes) in terms of negative sequene quantities applied at the relay terminals at the maximum torque angle of approximately 98 (urrent leading voltage). A typial sensitivity urve for the negative sequene diretional unit is shown in Figure 15. The time vs. urrent harateristi for the diretional unit is shown in Figure 16. July, 1987 Burden Data (All Burdens at 6 Hertz) Type CRQ Current Burden Desriptive Bulletin 41-13A The urrent burden of the relay with positive sequene urrents applied (no output urrent to the diretional unit) is as follows: Phase Continuous One Seond Watts At Volt- Amps Power Fator Rating: Amps Rating: Amps 5 Amps at 5 Amps Current burden of the relay with zero sequene urrents is as follows: 2 3 Phase Voltage Burden Watts at 5 Amps Volt- Amps at 5 Amps Angle 44 Lag oo 74 Lag Power Fator Angle Voltage burden of the CRQ with position sequene voltage applied (no output voltage to the diretional unit) is as follows: Potential Transformer Aross Phase Volts Watts Volt- Amps Burden Values on Three Star Conneted Potential Transformers. Values at Star Voltage of 66.4 Volts (115 Volts Delta) ' 1 " 27' Power Fator Angle 9 o Lag 48 Lag 3 Lag Burden Values On Two Open-Delta Potential Transformers. Values at 115 Volts Lag o Lag Lag Lag o Lead Burden Values on Three Delta Conneted Transformers. Values at 115 Volts Lag Lag oo Page 7

20 Desriptive Bulletin 41-13A Page 8 Burden Data, ontinued Diretional Unit Operating Ciruit Relay Type Ampere Range CR CRC CRP CRD Polarizing Ciruit Relay Burden n Volt- Amperes!) At12 Volts CR CRC CRD CRP CRD Minimum Pikup Value. At 5 Amps Burden n Volt- Amperes At Minimum At 3 Times At 1 Times Tap Value Minimum Minimum Current Tap Value Tap Value Current Current Power Fator Angle 58. Lag s Lag 28. Lead Thermal Rating 1 Seond. '. 23 Amps. 3 Seonds. ' 2 8 Volts Relay Tap Range Minimum Pikup Phase Angle Type n Amps Volts Amps CR leading V by 3 Voltage Unit in phase with V leading V by leading V by 3 CRC o leading p by 4 CRD in phase Current Unit , leading p by in phase CRP lagging by 6. CRD in phase with V Voltage Unit lagging V by 6 Overurrent Unit For burden data and thermal apaities of CR, CRC, CRP, and CRD overurrent units, see nformation 1 8 in phase with V Leaflet For type CRO, see nformation Leaflet For time urves, see Performane Data CS and lit Units At 2 Times Minimum Tap Value Current 1 1_ Continuous Volts For burden data, thermal apaity, see Performane Data Power Continuous 1- Seond Fator Rating Rating Angle n Amps n Amps CD '.') ' ' CD Voilages taken wrth retrfrer type voltmeter Degrees urrent lags voltage at tap value Thermal apartres for short trme other than oneseond may be alulated on the basrs of trme bemg rnversely proportronal to the square of the urrent. For example. on the amp range, the one-seond ratmg rs 88 amps To obta1n the 5 seond ratmg t1me-overurrent un1t (CO). the appropriate formula S. Ft = K. where K S the square of the one-seond rat1ng m amperes l't = (88)' = 7744 t =.5.51' =7744 l' = = 'v = ) Current un1t. Voltage un1t. (6) Degrees operating urrent leads or lags (as ndiated) polar1z1ng voltage or poijrtzing urrent July, 1987

21 .. ' External Wiring Diagrams CR Relay for Phase Protetion Desriptive Bulletin 41-13A S tat ion Bus Phase Rotation Vetors 3 At 1% P. F. Power n Trippi ng Diretion Phase 1 Relay Phase 11 Relay ;:; u "' o_ o_ Fig CRC for Ground Fault Protetion ;:; u O'l o_.9- f-- + Fig July, 1987 Phase Relays Pos. or Neg. o_ "' f-- :J..._...tr,..'-..._J' ucd Phase 1 Phase 2 Phase Neg. or Pas. )wo-- i \ Vetor Rotation \ Devie Number Chart 67 - Drettonal Overurrent Relay, Type CR CS - ndtating Contator Sw1th 52 - Power Cru1t Breaker 52a - Breaker Auxil1ary Contat 52TC- Breaker Trip Coil Devie Number Chart 182A Dret1onal Overurrent Relav. Type CRC CO - Overurrent Un1t - Jrettonal Un1t D CS - nd1at1ng Contator Swith 52 - Power C1ru1t Breaker 52TC- Breaker Tnp Coil 52a - Breaker Auxil1ary Contat 182A 7 9 Page 9

22 Desriptive Bulletin 41-13A Page 1 External Wiring Diagrams, ontinued CRP For Ground Fault Protetion Station Bus <: Fig rli h or Pas...'--'-J.J- Neg. Phase Relays CRD For Ground Fault Detetion Station Bus. &7N &.Jr'-n--L-1"-'..,. l ual Neg. or :4.r.oi' Devie Number Chart -Diretional Overurrent Ground Relay, Type CRP CO -Overurrent Unit Diretional Unit D CS -ndiating Contator Swoth 52 - Power Ciruit Breaker 52TC- Breaker Trip Coil 52a - Breaker Auxiliary Contat <: l - u L J-... nstall Jupers As Shown f Potential. CS Polarizing s Not Used. r+-f----.-, Phase PoL Neg. Relays or or eg. " Pas f- + Fig g m O f- " res T Devie Number Chart - Diretional Overurrent Ground Relay, Type CRD BlN - Overurrent Unit o BlN -Lower Diretional Unit DL 52a DU - Upper Dretional Unit CS - ndiating Contator Swith 52 -Power Ciruit Breaker 52TC- Breaker Trip Coil 52a -Breaker Auxiliary Contat 182A A791 July,

23 CRQ For Ground Fault Detetion Station Bus Phase Rotation ;::; u > a..9- f- + Fig July, 1987 Other Relays "' aj a. 4,r: 18 f w Pos. v-:'1,..,...,..,. "'4«5 CO D rv=-:.-, CS L- to Neg. Diret ional Unit Phase Angle Charateristis Other Relays Contat Closes Alternate Connetion N eutral Formed External ly) Devie Number Chart Desriptive Bulleti n 41-13A - 1ret1onal Overurrent Negat1ve Sequene Ground Relay, Type CRO CO - Overurrent Unit - D1ret1onal Un1t CS - nd1atlng Contator Sw1th 52 - Power C1ru1t Breaker 52TC - Breaker Trp Coil 52a - Breaker Auxil1ary Contat Page 11

24 Desriptive Bulletin 41-13A Page 12 Shipping Weights and Carton Dimensions Relay Flexitest Weight: Lbs, Approx. Type Case Type Net Shipping CR FT CRC FT CRP FT CRD FT CRQ FT Domesti Shipping Carton Dimensio ns: nhes Bx1x15 8x1x 15 Bx1x15 Bx1x21 8 X 1 X 24 For burden data and thermal apaity of CS and T units, see Performane Data Further nformation Pries And Ordering nformation: PL 41-2 Case Dimensions : DB CO Overurrent Time Curves : PD 41-1 nstrutions : CR, CRC, CRP, CRD: L ; CRQ: L Renewal Parts Data : RPD A1 Other Westinghouse Protetive Relays : SG 41-1 OOA, SG 41-1 OOB Westinghouse Eletri Corporation Relay and Teleommuniations Division Coral Springs, FL 3365 Printed in U.S.A. July, oi