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5

Maintenance

5.1

General

Static devices require no preventive maintenance other than

a periodic operational test (see

Page 20).

If the relay fails to

function properly, contact Siemens Customer Service. When

returning the relay to the factory, ship the entire relay cradle

assembly, preferably in its case.

5.2

Storage

This protective relay contains aluminum electrolytic capacitors
which generally have a storage life expectancy in excess of ten
years at storage temperatures less than 40° C. Typically, the life
expectancy of the capacitor is cut in half for every

1 oo

C rise in

temperature. Storage life can be extended if, at one-year inter

vals, power is applied to the relay for a period of 30 minutes.

Page 25

5.3

Timekeeping

The real-time clock within the relay, once set by the Power

Monitor unit after power up, maintains time to a resolution of 0.01

second; however, drift within the clock can be as much as 0.5
seconds per day. In order to keep all of the clocks in the system
in proper synchronization, the Power Monitor periodically broad
casts the correct time.

Note that changing the time within a relay by seconds or minutes

can upset instrumentation functions such as demand calcula
tions.

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Содержание SCOR

Страница 1: ...elay I J TapA B H C G D F E AB C FunctionI Data 1 lll 1 1 Ll 1 I I Manual No SG 9228 01 t Time lnst 1 A B c G Instruction Installation Operation Maintenance Hardware 3 11 Software 3 40 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 2: ... t fill fill g I M edium voltage switchgear withAccessTM system field devices SCOR overcurrentorotective relav 1r II c I i w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 3: ...ese families are graphi cally illustrated in Figures A 1 through A 16 in Appendix A If ground current is monitored its timing characteristic is independently selected from the 16 families Selection ofthetiming characteristics is made at the front panel orviaoneofthetwocommunications links Afteracharacteristic is selected it is adjusted to specific requirements by choosing theTIME DIAL number These...

Страница 4: ...d instantaneous overcurrent pickup values for phase and for ground are entered via the data entry controls at the front panel This can also be done remotely by the data link if the communications option is present 1 6 The Ground Time Overcurrent and Instantaneous Functions When the sensing input type includes ground current sensing the relay is supplied with a separate and independent time overcur...

Страница 5: ... It is necessary in some applica tions to trip a separate lockout relayfor ground faults This can be achieved by selecting Option 1 2 and configuring the relay to cause tripping through this separate relay contact for ground faults The ground tripping can be for operation ofboththetime and instantaneouselements but either can be configured to be disabled if desired Page 3 1 9 Communications Option...

Страница 6: ...vercurrentfunction andcurveselected pickup settings and current transformer ratios Whicheverport is used all communications must be initiated by the Power Monitor unit or computer When addressed all ofthe relay s storage registers mayberead bythePowerMonitor unit and many of them can be altered Password protected 1 10 Breaker Failure Whentherelay includestheCommunicationsOption a Breaker Failuare ...

Страница 7: ...hreefeatures provided by Option 1 2 is desired the eighth character of the style number is 2 The ninth character must be C to specify the communications board option This would allow communica tion with a Power Monitor unit or a local terminal Thetenth characterofthe style number is 0 ifthe control power for the power supply is DC However if 1 20 volt AC control power is to be used then this chara...

Страница 8: ... and assigned a locator letter Table2supplies a description foreach Data is displayed D c Q p 0 Page 6 in primary kilo amperes The Time Target and Element BTarget areshadeddarker indicatingthatthe relaycausedan overcurrent timed trip due to a fault on Phase B and the targets have not been reset E F G H J K L N Figure 3 Controls and Indicators w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 9: ...registers that control operation of the relay The instrumentation registers monitor the input current and the demand current in kilo amperes A row of dashes indicates an out of range condition Dashes along the bottom of the display indicate that the current is somewhere below 1 0 of TAP dashes along the top indicate a current above 1 50 of TAP When the relay is powered up the display will default ...

Страница 10: ...ion up for approximately 5 seconds when the word dAtA is exhibited on the FUNCTION DATA display locator D selects the CONFiguration mode Holding the switch in the MODE position for 5 seconds when ConF is displayed selects the DATA mode and also loads data changes if any into memory When neither dAtA nor ConF is on the display holding the switch up in the MODE position identifies the register whose...

Страница 11: ...a relay output has tripped Note that the current through the associated output contact must exceed 0 2 A to actuate the target For reset see M Depending upon the style number some of the illustrated targets may not be present Indicates that a trip was caused by a TIME overcurrent function INST 11ndicates a trip initiated by the INSTantaneous 1 function Only provided if Option 1 2 is selected Indic...

Страница 12: ... repeatedly until the word dAtA is in view on the front panel display Then hold the switch up for approximatelyfive seconds during which time the display Page 10 becomes blank Release the switch after ConF appears in the display Upon release of the MODE switch the STATUS LED will be lit and ConF will be in view on the FUNCTION DATA display Releasing the MODE switch before 5 seconds has expired ret...

Страница 13: ...ndary Amps Grou_r 1d CT Primary Amps Grou_r 1d CT SEcondary Amps Phase rAnge Grou_r 1d rAnge demand Period ground trip Enable If 20 is YES the following options are provided Ground instantaneous trip 50 g Ground time trip 51 g If the relay includestne auxiliary output relay 20C is provided Q ili ut relay to be tripped by the ground function breaker Failure enable Wraps to the top i e to the Mode s...

Страница 14: ...emens Power Monitor unit the address will be used to identify the particular SCOR Relays initiallyareconfiguredwiththeaddress 222 Ifthishasnot been changed it must be done prior to accessing from the PowerMonitorunit It issuggested thata listofdevices be made with the information shown in Table 4 3 2 7 Setting the Baud Rate Using the procedures described above for entering the CONFiguration mode d...

Страница 15: ...gures A 1 through A 16 in Appendix A for graphic representations of these curves Page 1 3 3 2 12 Selecting the CT Ratios Registers 1 3 through 1 6 provide a multiplier that allows the microprocessorto match the relay s response to the turns ratio of the external CTs The relative turns ratio of the CTs is expressed as a fraction whose denominator is 5 3 2 13 Current Sensing Range The 1 7th and 1 8t...

Страница 16: ...obtain the average demand value The latter is then displayed in the Demand Current registerfortheappropriatephase The demand current values may also be read over the data link Alloftheinstrumentation registers registers 1 through 7 display their data in real time Note that if the amperes are over or under theoperationalscaleoftheammeter the display will showa row of four dashes The position of the...

Страница 17: ...culated as follows Given Pickup value Tap C HIGH Tap D HIGH 4 7 A 4 0 A 5 0 A Page 15 Then Set Phase Tap Switch Front Panel on C Span Tap D Tap C 1 00 Difference Pickup value Tap C 0 70 Tap Cal value phase Difference Span x 1 00 0 70 1 00 X 1 00 70 3 The ground time overcurrent pickup 1 6 A falls between tap C and tap D of the LOW range Figure 3 The ground Tap Cal value is Pickup value Tap C LOW T...

Страница 18: ...ase Tap Cal register and 20 into the ground Tap Cal register 4 Enter 4 7 into the phase instantaneous 1 overcurrent register and 4 27 into the ground Instantaneous 1 Over current register 5 Enter07 into the phase TIME DIAL register and 05 intothe ground TIME DIAL register Page 16 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 19: ...ront cover 5 Be sure that the relay case is hard wired to earth ground using no smaller than 1 2 AWG copper wire to the ground terminal on the rear of the unit It is desirable to use a separate ground wiretothe ground busforeach relay Ifthis is not practical the number of relays sharing a ground wire should be kept to a minimum Page 17 4 3 Dielectric Test In accordance with ANSI IEEE C37 90 1 989 ...

Страница 20: ... 72 r o 0 8 63 I I I I I I I I 8 25 219 1 I I 209 6 1 nl ct 4 31 109 5 ct i 4 13 104 8 ii i I 0 0 __ J 6 7 _ 5P Js LA 154 0 MOUNT RELAY USING 4 10 SCREWS DIMENSIONS IN INCHES AND CENTIMETERS Figure 5 Panel Drilling and Cutout Dimensions For Semi Flush Mounting Page 18 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 21: ... TRIP DIODES AND RESISTOR ARE INTERNAL COMPONENTS OF THE RELAY THEY ARE SHOWN HERE TO INDICATE THE SOURCE OF DIRECT CURRENT FOR 52b SENSING POWER D THE RS 232 PORT IS ON FRONT PANEL ALL OTHER 2 CONNECTIONS ARE AT REAR OF CASE Figure 6 Relay Connections 51 cr 3 51 4 51 9 11 51 12 52b Figure 7 Control Circuits LEGEND 51 OVERCURRENT RELAY 52 BREAKER TRIP COIL TC 52a BREAKER AUXILIARY CONTACTS INST 1 ...

Страница 22: ...cceptance Page 20 procedure for a newly delivered relay Succeeding tests can be reduced in scope to conserve time and thereby permit more frequent tests Such an operational test may be accomplished by scaling down the verification tests of this subsection as follows 1 Byconcentrating ontheparameters actually required in the assigned application 2 Byusing spot teststhatcheck forexample onlyoneortwo...

Страница 23: ... the POWER LED is lit and that the relay disabled contact is open 4 Load 00 into the Phase Tap Cal register 5 Load 99 into the Time Dial register 4 7 3 Time Overcurrent Pickup Test The phase current pickup of the relay will be set at the factory to operate on one of the two available ranges HIGH or LOW If ground current is monitored it will also be set for one ofthe two ranges Determine which rang...

Страница 24: ... phase with ground relay perform steps 6 7 1 0 and 1 1 below If three phase with ground perform all of the following steps 6 Disconnect the input current source from terminals 7 and 8 Phase A and connect it to terminals 1 4 and 1 5 Phase B 7 Repeat steps 2 through 5 above for Phase B 8 Disconnect the input current sourcefrom terminals 1 4 and 1 5 Phase B and connect itto terminals 1 7 and 1 8 Phas...

Страница 25: ... to output contact closureforcurrents that areadjusted to the following multiples of TAP a 2 0 x TAP and b 5 0 x TAP Check the results against the graphed values 5 Adjust the TIME DIALto 20 and repeat step 4 NOTE If this is a single phase relay this concludes a minimal Timing Test Other TAP switch positions may be tried within the limitations of the current source If this is a three phase relay wi...

Страница 26: ... H I and J successively 7 If Option 1 2 is present and is used as lnst 2 follow the procedures of steps 2 through 6 for testing the Instanta neous 2 pickup and output Page 24 NOTE If this is a single phase relay this completes the Instantaneous Overcurrent Pickup Test If this is a three phase relay perform steps 8 through 1 2 below If a two phase with ground relay perform steps 8 9 1 2 and 1 3 lft...

Страница 27: ...ncy of the capacitor is cut in half for every 1oo C rise in temperature Storage life can be extended if at one year inter vals power is applied to the relay for a period of 30 minutes Page 25 5 3 Timekeeping The real time clock within the relay once set by the Power Monitor unitafterpower up maintainstimetoa resolution of0 01 second however drift within the clock can be as much as 0 5 seconds per ...

Страница 28: ...ciation April 1 983 2 Siemens Power Monitor Display and Monitoring Unit Manual No SG 401 8 01 3 Siemens SCOR Protocol Page 26 4 Siemens Isolated Multi Drop RS 232 to RS 485 Converter Manual No SG 6048 5 Siemens Power Monitor PC User s Guide Manual No SG 4028 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 29: ... memory ofthis relay Refer to Table 1 on Page 5 for a listing of the 1 6 characteristic curves Notethatadrawing number isgiven undereach caption Usethis number to order a full size 1 0 x 1 2 Characteristic Curve set The Phase and Ground Instantaneous Time Curves are pre sented in Figures A 17 and A 18 respectively w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 30: ... A 1 Timing Type b1 Short Inverse Time Owg No 1 8 752 294 001 07 83 02 01 00 8 z 0 _ w f z w lOO 200 100 10 10 10 10 50 40 lO 20 10 I 7 5 1 L l I I l I f 1 I I L 1 1 II I I 1 1 1 I I I 1 I _ r r t r r t r r r I I r r r r r 2 i 7 I 5 4 3 2 1 01 01 07 01 Oil 04 OJ 02 01 I 5 7 1 J 4 5 I 7 8 t 1 0 MULTIPLES OF PICKUP SETIING r J oo 20 Figure A 2 Timing Type b2 Long Inverse Time Dwg No 1 8 752 294 002 ...

Страница 31: ...Time Dwg No 1 8 752 294 003 T I E 0 I A L 99 80 60 50 40 30 20 10 07 05 03 02 01 00 20 0 z 0 _ UJ z UJ 200 100 10 10 70 10 40 20 0 7 5 4 J 2 1 Y t iii iii r I r r I r t I F 7 I 5 4 3 2 1 oe oe 07 oe oa 04 03 02 01 7 1 f ii liiiO 1 r 1 r r l 4 I 7 I 110 20 MULTIPLES OF PICKUP SETIING Figure A 4 Timing Type b4 Moderately Inverse Dwg No 1 8 752 294 004 T I E 0 I A l 99 80 60 50 40 30 20 1 0 07 05 03 ...

Страница 32: ...Figure A 5 Timing Type b5 Inverse Time Dwg No 1 8 752 294 005 T I E 0 I A L 99 80 60 50 40 30 20 1 0 07 05 03 02 01 00 z 0 0 llJ z llJ ID ID 40 10 I I 7 I I i 7 I I 4 2 t oi Ill 07 01 o4 7 1 1 1 _ _ 1 _ _ n M L _ I l I l l IV l 1 1 l I N too F L _ l iii 1 I ll l 1 1 J 4 I I 7 I 110 MULTIPLES OF PICKUP SETIING Figure A 6 Timing Type b6 Very Inverse Time Dwg No 1 8 752 294 006 T I E 0 I A L 99 80 80...

Страница 33: ...ing Type b7 Extremely Inverse Owg No 1 8 752 294 007 T I E 0 I A L 99 80 60 50 40 30 20 1 0 07 05 8 01 00 f 100 10 ID 111 10 50 40 20 10 I I 7 I s 0 3 z 0 i 1 l l l 1 I I n _ w f w 1 I F I 1 3 2 1 01 01 rn oa Oil 04 OJ 02 01 1 1 1 1 1 a I 7 1 1 1 3 5 1 7 1 110 MULTIPLES OF PICKUP SETIING Figure A 8 Timing Type b8 H Owg No 1 8 752 294 008 _ Ill T I E 0 I A L 99 80 80 50 40 30 20 1 0 8A 01 00 w w w ...

Страница 34: ...ULTIPLES OF PICKUP SETIING Figure A 9 Timing Type c1 J2T w Limit 1 Dwg No 1 8 752 294 009 Ill Cf 0 z 0 0 w Cf z w F 1 l 10 10 50 40 1 50 l 20 l r 10 I I 7 5 I 1 l l 1 1 1 1 1 I 1 1 1 1 1 I 1 I 7 _ l 1 1 1 1 4 111 1 J 1 1 2 1 1 CII CII 07 01 00 04 03 01 01 7 1 J 4 5 t 1 I 110 MULTIPLES OF PICKUP SETIING Figure A 10 Timing Type c2 12 f w Limit 2 Dwg No 1 8 752 294 01 0 T I M E 0 I A L 99 80 60 50 40...

Страница 35: ...ES OF PICKUP SETIING Figure A 1 1 Timing Type c3 FT w Umit 3 Dwg No 1 8 752 294 01 1 T I M E 0 I A L gg eo 80 50 40 30 20 10 U 0 z 0 _ LU U LU i D n 1 1 f l 1 I 2 H t H 1 Ht MM T I M E 80 80 50 40 30 20 10 I 01 00 01 L J L l LL L_J_ L L LLJ _J L L LJ L L A 7 A I 1 J 4 5 7 111 MULTIPLES OF PICKUP SETIING Figure A 12 Timing Type c4 FT w Limit 4 Dwg No 1 8 752 294 01 2 Ill w w w E l e c t r i c a l P...

Страница 36: ...LES OF PICKUP SETIING Figure A 13 Timing Type c5 12T w Limit 5 Dwg No 1 8 752 294 013 T I E D I A L 80 eo 50 40 30 20 1 0 z 0 u UJ z UJ t 11 Ill 10 I 7 I J 1 I I 7 I I 4 3 I ai 01 01 01 I l 1 1 1 t 1n L 1 1 1 I I 7 1 1 1 J 4 I I 1 I 111 MULTIPLES OF PICKUP SETIING Figure A 14 Timing Type c6 12T w Limit 6 Dwg No 1 8 752 294 01 4 T I E D I A L 10 eo 50 40 30 20 10 I 00 w w w E l e c t r i c a l P a ...

Страница 37: ...TIING Figure A 15 Timing Type c7 2T w Umit 7 Dwg No 1 8 752 294 01 5 T I M E D A I L gg 80 e0 50 40 30 0 2 1 0 I z 0 _ UJ f UJ F 100 10 10 7V 10 so 40 20 10 I I 7 I 1 I 4 3 2 1 01 01 07 01 01 04 Ol 02 01 1 c _ i t I ll I I 7 1 1 1 l 4 I I 7 I 1 10 20 MULTIPLES OF PICKUP SETIING Figure A 16 Timing Type c8 FT w Limit 8 Dwg No 1 8 752 294 01 6 T I E D I A L gg 80 eo 50 40 30 20 10 w w w E l e c t r i...

Страница 38: ... t t t t t 1 1 22 92 _L_L _L_L _L L _L 2 4 6 8 10 12 14 16 MULTIPLE OF TAP 18 20 Figure A 1 7 SCOR Instantaneous Time Curve Phase Timings 70 60 1 50 s w 0 w 30 SCOR INSTANTANEOUS TIME CURVE GROUND TIMINGS 2 1 I 4 6 8 10 12 14 16 18 20 MULTIPLE OF TAP Figure A 18 SCOR Instantaneous Time Curve Ground Timings w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 39: ...erprovidesanadjustmentfrom 0 50 to 1 00Aforthe LOWrange andfrom 2 00to3 00Aforthe HIGH range EXCEPTION At the highest TAP position i e J the setting of the Tap Cal register is ignored Therefore the J values of 5 0 and 1 1 00 representthe upper limits oftheLOWand HIGH ranges respectively 8 3 Power Supply B 3 1 General The solid state power supply is a low burden flyback switching design which deliv...

Страница 40: ...he computer s memory Operating Power POWER SUPPLY Loss Of Power Detector The current inputs are continuously polled and the calculations updated once for every 60 Hz line cycle As long as the sensed current is above the pickup point the elapsed time is accumu latedtoward trip However once the sensed current falls below pickup the relay is reset and all accumulated time is cancelled When thevalue o...

Страница 41: ...n 3 Operation by Front Panel When two instantaneous outputsareselected one ofthem can be programmed to operate directlyfrom the system computer assumingthatthe Communications Option is also present The programming information is supplied in the Siemens Power Monitor Display and Monitoring Unit Manual SG 401 8 01 The second output relay when controlled by the computer cannot simultaneously serve as...

Страница 42: ...lableon the SCOR display such as system diagrams with real time amperes and circuit breaker position detailed datafor all phases and ground simultaneously which changes to a trip log with time stamped currents at the time oftrip relaytargetoperation plus watchdog status a MIN MAX log and an event log with a time stamped chronological listing of events of all devices on the bus The event log is a p...

Страница 43: ...se at nominal 60 Hz see Table 3 60 Hz Two ranges are available HIGH 2 0 1 1 0 A and LOW 0 5 5 0 A Range is independently specified for phase and ground by the second digit of the Style Number The TAP range windows on the front panel indicate which range HIGH or LOW is specified Selection of the desired tap is made using the rotary selector switch s on the front panel Refer to the table on the fron...

Страница 44: ...ision is made to monitor primary current on a real time basis Accuracy is within 1 2 Range is from 1 0 of TAP at the low end to 1 50 of TAP at the high end Includes an RS 232 port on the front panel for local testing and configuration and an RS 485 port at rear of unit for operation by a Siemens Power Monitor unit at distances up to 4000 feet using baud rates up to 1 9 200 Power for the internal c...

Страница 45: ...ofthree mutually perpendicular axes without structural damage or degradation of performance In standard tests the relay has withstood 2 g in each of three mutually perpendicular axes swept over the range of 10 to 500 Hz for a total of six sweeps 1 5 minutes each sweep without structural damage or degradation of performance 1 500 Vac at 60 Hz for one minute in accordance with IEC 255 5 and ANSI IEE...

Страница 46: ...53 2 30 1 1 1 0 2 20 1 0 71 5 41 D 1 1 33 2 25 1 0 82 5 46 10 87 5 46 E 10 94 5 54 1 0 69 5 41 1 1 57 5 86 F 1 0 71 5 41 1 0 86 5 49 1 0 70 5 41 G 1 0 88 5 52 1 0 70 5 41 1 0 69 5 41 H 1 0 87 5 49 1 0 70 5 41 1 0 64 5 38 I 10 84 5 49 1 0 69 5 41 1 0 66 5 38 J 10 83 5 49 10 69 5 41 1 0 67 5 41 A HIGH 5 78 1 14 5 50 2 79 5 61 1 1 1 B 5 70 1 1 4 5 57 1 1 1 5 58 1 1 1 c 5 66 1 14 5 49 1 09 D 5 69 1 14...

Страница 47: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Страница 48: ... EM ENS Siemens Energy Automation Inc Electrical Apparatus Division P O Box 29503 I Raleigh NC 27626 91 9 365 6660 SG 9228 01 8 92 2M PRINTED IN U S A w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

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