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ABB SRW, Instruction Leaflet, Page: 14 / 22

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ABB SRW Instruction Leaflet Download Page 14

I.L. 41-252A

14

Figure 4a. Internal Schematic – SRW Relay (Sheet 2 of 2)

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1355D79

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Summary of Contents for SRW

Page 1: ...s from 1 mA to 40 mA at the maxi mum sensitivity angle 2 CONSTRUCTION The SRW relay consists of three printed circuit mod ules and a front panel packaged in a FT 11 case For detailed information on the flexitest case refer to I L 41 076 The photograph in Figure 1 shows the SRW relay in its case 2 1 Interface Module The interface module mounted at the bottom of the relay contains a voltage transfor...

Page 2: ... their output contacts 2 3 Transformer In rush Module The In rush module is located on top of the SRW module and electrically connected by two bottom entry connectors to the SRW module This module contains five integrated circuits and several discrete components A blue link L1 is used to select the power supply voltage for this module Positions are available for 48 125 or 250 Vdc with the 125 volt...

Page 3: ... φ equals 0 Since signal C leads Vac by 30 the maximum sensitivity occurs when Ia leads Vac by 30 Assume that Ia and signal E are in phase It can be compensated by adjusting the phase shifter between points A and B for any phase shift caused by possible component imperfections To produce a trip the dc component cos φ must be positive i e the angle φ is between 90 and 90 To stay in restraint cos φ ...

Page 4: ...ected as a differential amplifier whose output voltage is proportional to the input current Ia from 1 mA to 5 amps The phase angle relationship remains constant between 1 mA and 50 amperes The multiplier circuit contains IC7 IC4 A R61 R62 R63 and R64 The gain of IC7 is 1 or 1 for the open or closed contact in switch IC4 A respectively The output waveforms of the multiplier are shown in Fig ure 10 ...

Page 5: ... The maximum temperature outside the relay case should not exceed 55 C for normal operation see CHARACTERISTICS for temperature range specification Mount the relay vertically by means of the four mounting holes on the flanges for semi flush mount ing For projection mounting install the special pro jections mounting hardware provided in mounting material kits when required Either the installed pro ...

Page 6: ...or 70 Vac to term 6 7 Adjust the phase shifter to read I leading V by 30 deg on the phase angle meter 3 Connect CH 1 of the dual trace scope to TP3 and CH 2 to TP4 Two waveforms should be in phase 4 Connect a digital voltmeter to TP1 and its common to TP5 The reading should be higher than 13 volts 5 Adjust the phase shifter until the meter reads zero volts at TP1 the phase angle meter should be 30...

Page 7: ...y and all settings and times of operation should be checked at least once every year or at such other intervals as may be indicated by experience to be suitable to the particular application 8 1 Calibration The proper adjustments of the trimpots P1 P2 P3 and P4 have been calibrated by the factory and should not be disturbed by the customer unless the relay is out of calibration shown in the Accept...

Page 8: ...lay for 10 seconds by either opening DIP switch 1 10 sec or open ing switches 2 5 sec 3 3 sec and 4 2 sec c Turn on ac and dc voltages Set the input current at 1 ampere and adjust the phase shifter for current leading voltage by 30 deg d Turn on SW 1 suddenly The digital timer should give a reading of 10 seconds 5 If the reading is too high remove capacitor C2 and or C4 from the PC board e Check t...

Page 9: ...Interface Module 1500B49 7 Component Location In rush Module 1499B41 8 External Schematic of the Type SRW Relay for Reverse Power Protection 1495B45 9 External Schematic of the SRW Relay to Prevent Reverse Magnetization When Utility Tie is Removed From the Local System 1495B46 10 Multiplier Waveforms 9645A93 11 Test Connection for the SRW Relay 1495B54 12 Outline and Drilling Plan for the SRW Rela...

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Page 11: ...I L 41 252A 11 Figure 2 Simplified Terminal Connection Drawing 9645A75 Sub 3 Denotes Change ...

Page 12: ...I L 41 252A 12 Figure 3 SRW Block Diagram Sub 2 1495B44 Denotes Change ...

Page 13: ...I L 41 252A 13 Figure 4 Internal Schematic SRW Relay Sheet 1 of 2 Sub 4 1355D79 Denotes Change ...

Page 14: ...I L 41 252A 14 Figure 4a Internal Schematic SRW Relay Sheet 2 of 2 Sub 4 1355D79 Denotes Change ...

Page 15: ...I L 41 252A 15 Figure 5 Component Location SRW Module Sub 2 1500B50 Denotes Change ...

Page 16: ...I L 41 252A 16 Figure 6 Component Location Interface Module Sub 4 1500B49 Denotes Change ...

Page 17: ...I L 41 252A 17 Figure 7 Component Location In Rush Module Sub 3 1499B41 Denotes Change ...

Page 18: ...I L 41 252A 18 Figure 8 External Schematic of the Type SRW Relay for Reverse Power Protection Sub 2 1495B45 Denotes Change ...

Page 19: ...I L 41 252A 19 Figure 9 External Schematic of the SRW Relay to Prevent Reverse Magnetization When Utility Tie is Removed from the Local System Sub 3 1495B46 Denotes Change ...

Page 20: ...I L 41 252A 20 Figure 10 Multiplier Waveforms Sub 1 9645A93 ...

Page 21: ...I L 41 252A 21 Figure 11 Test Connection for the SRW Relay Sub 2 1495B54 ...

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