Which protection is used for stator fault of synchronous generator?

The main protection provided in the stator winding against phase to phase or phase to earth fault, is longitudinal differential protection of generator. Second most important protection scheme for stator winding is inter turn fault protection.

Which protection is used for stator fault?

Over current relays can not detect the winding temperature because electrical protection can not detect the failure of the cooling system. So to protect the stator against over heating, embed resistance temperature detector or thermocouples are used in the slots below the stator coils.

Which protection is provided for stator winding faults in alternator?

Any internal fault inside the stator winding is cleared by mainly differential protection scheme of the generator or alternator. The differential protection is provided in the generator by using longitudinal differential relay.

What is 87G protection?

Generator Stator Phase Fault. Protection (87G) •Split-phase protection scheme. •Able to detect turn-turn faults. •Windings for each phase split into equal groups.

Which is the most important stator winding fault of an alternator?

01. Stator winding fault. It is the most severe fault and considered most important for alternator protection. This vital protection of alternator stator is Differential circulating current scheme or Mertz price differential current protection scheme of alternator is discussed in a separate post.

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Which relay is used in transformer?

Relays for Transformer Protection

SL Voltage Ratio and Capacity of Transformer Common Relays
9 400/220KV 315MVA Differential Relay Overflux Relay Buchholz Relay OLTC Buchholz Relay PRV Relay OT Trip Relay WT Trip Relay Over Load (Alarm) Relay

What is the common problem of generator?

Batteries: Battery failure is the most common failure when it comes to generators. Always make sure the batteries, chargers, and all cables and connections leading to and from are in good condition. Failure to Start: If a generator fails to start, one cause could be the controls not being set to auto.

Can you overload a generator?

An overload in a generator generally happens when too many appliances are plugged into the generator. This causes the generator to exceed its designed wattage. Some generators are protected from an overload by circuit breakers to help combat this but if not, you should know the signs.

Which type of protection is provided on a generator to protect against stator insulation failure?

The main protection provided in the stator winding against phase to phase or phase to earth fault, is longitudinal differential protection of generator. Second most important protection scheme for stator winding is inter turn fault protection.

What are the main types of stator winding faults?

Different types of stator winding faults are (i) short circuit between two turns of same phase—called turn-to-turn fault, (ii) short circuit between two coils of same phase—called coil to coil fault, (iii) short circuit between turns of two phases—called phase to phase fault, (iv) short circuit between turns of all …

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Why does a generator need to be tripped in case of loss of excitation?

Loss of excitation protection is used to protect the synchronous machine (alternator or generator) acts as induction motor when the excitation fails. Loss excitation protection operates under many circumstances such as diode failure, rotor winding short circuit, AVR failure, etc.