Misalai na Ikkadarwar Samun Hanyoyin Tashar Turuwanta?

Me kana Differential Protection of Transformers?

Bayani Differential Protection

Differential protection of transformer yana daya daga cikin hanyoyi na tashar gaba da ke amfani a kan tsarin transformer, wanda ake amfani don lura wasu abubuwa masu gaba a cikin transformer, kamar winding short circuit, turn short circuit da sauransu. Differential protection yana nuna cewa an samu gaba ko ba ta da shi, tare da karfin hadadin current a fadin da kuma fadinkuwan transformer.

Tsunani Differential Protection

Differential protection tana yi amsa game da tsunani mai yawa: a cikin tsari na yau da kullum, current na fada da kuma current na fadinka a fadin da kuma fadinkuwan transformer yana iya zama mafi muhimmanci. Idan ana samu gaba a cikin transformer, kamar winding short circuit, za a fara unbalanced current a cikin differential circuit. Differential protective relay yana nuna wannan unbalanced current don in yi aiki na tashar gaba.

Disposition

Current transformers (CTs) : Ana sanya current transformers a fadin da kuma fadinkuwan transformer don in yi takarda current.

Differential relay: Differential relay yana jin signal na current daga CTs kuma yana haɗa shi.

Ratio braking characteristics: Differential relays suna da ratio braking characteristics, yana nufin cewa value na aiki na tashar gaba ya zama mafi yawa idan unbalanced current ya zama mafi yawa a cikin external fault don in bincika misoperation.

Operation process

Sanya current transformer

Sanya current transformer a fadin da kuma fadinkuwan transformer.Polarity na CTs yana bukatar in yi aiki masu daidai don in tabbataccen current flow.

Configuration differential relay

Set operating threshold na differential relay.Adjust parameters na ratio braking characteristics don in daidaita yanayin transformer.

Monitoring unbalance current

Differential relay yana nuna continuously difference na current na fada da kuma fadinka a fadin da kuma fadinkuwan transformer.Idan unbalance current ya zama mafi yawa da set threshold, differential protection zai yi aiki.Trigger protection action.Idan an samu gaba a cikin transformer, differential protection zai trigger trip, in bude transformer daga grid.

Matters needing attention

Polarity connection: Tabbatar da polarity na current transformer ta daidai, idan ba ta daidai zai iya faɗa protection misoperation.

Ratio braking characteristics: Set ratio braking characteristics daidai don in bincika misoperation a cikin external failure.

Current transformer saturation: A cikin halayen yawan current kamar short circuits, CTs zai iya faɗa saturated, in bude protection misoperation.

Winding wiring: Tabbatar da winding wiring ta daidai don in bincika unbalanced current.

Maintenance and verification: Maintain and verify differential protection regularly to ensure its accuracy and reliability.

Advantages of differential protection

Fast response: Yana iya nuna cikakken transformer internal fault.

Highly selective: Ana yi aiki ne a cikin transformer internal fault kawai da kuma selective a cikin external faults.

High sensitivity: reliable operation even in case of minor internal faults.

Limitations of differential protection

External failure: A cikin external failure, differential protection zai iya faɗa unbalanced current, in bude misoperation.

CTs saturation: A cikin halayen yawan current, CTs zai iya faɗa saturated, in bude accuracy na protection.

Maintenance and verification

Periodic verification: Verify periodically differential protection system don in tabbataccen performance.

Simulation test: Yi simulated fault tests don in nuna response capability na protection system.

CTs maintenance: Check periodically operating status na CTs don in tabbataccen accuracy and reliability.