TDR9000 TIMING OF HV OIL CB WITH RESISTORS

Jozef LeviDoble Engineering Company

TDR9000

TIMING OF HV BULK OIL CIRCUIT BREAKERS WITH RESISTORS

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

Introduction

insertion resistor on close

dividing resistors on open and close

bulk oil breakers timing

conclusion

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

two breaking elements per phase

Breaker design

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

closed before main contacts for up to 10 msin series with main contactsmain contact closed - insertion resistors bypassed mechanism opens resistor contacts

insertion resistor on close

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

Dividing resistors operation

there is no separate mechanism dedicated to dividing resistors

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

Close operationmoving contact engages with resistor probeno request for high contact pressureresistors are inside main circuit for relatively long time – 40 to 50 ms

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

loose contact produce scattered lines at test results graphics

Close operation

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

Bulk oil circuit breaker timing

Circuit breakers with dividing resistors

bulk oil CB are with two breaking elements test instrument represent results, as there is only one

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

TDR9000 Instrument electronics

Bulk oil circuit breaker timing

Circuit breaker is bistable apparatusIn case resistors are present we have three stages

Open breaker - infinite impedanceClosed breaker - practically zero impedance Resistors in circuit – definite impedance

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

TDR9000 Instrument electronics

Bulk oil circuit breaker timing

TDR9000 is equipped with electronics comparatorDifferent combinations of comparatorsdetect different stages

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

GE FK 439

Bulk oil circuit breaker timing

TDR9000 detect resistor when resistorchannels are open in test plantesting was performed with and without opening resistor channels

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

GE FK 439

Bulk oil circuit breaker timing

graphic presentation on Close resistor channels open

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

GE FK 439

Bulk oil circuit breaker timing

graphic presentation on Trip resistor channels open

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

GE FK 439

Bulk oil circuit breaker timing

graphic presentation on Close resistor channels are not open

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

GE FK 439

Bulk oil circuit breaker timing

graphic presentation on Trip resistor channels are not open

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

Conclusions

majority of bulk oil breakers are withoutinsertion resistors on Close

dividing resistors are used for higher voltages

perform test with and without resistors channel open

overlay results

TDR9000 TIMING OF HV OIL CB WITH RESISTORS

Thank you for listening