Girman Rotor Duniya Fault Protection

Takaitaccen Rotor Earth Fault Protection

Takaitaccen rotor earth fault protection yana nufin hukuma da tattara wani abu a cikin field winding na rotor don samun karshe.

Turukan Takaitaccen Rotor Earth Fault Protection

• Potentiometer method

• AC injection method

• DC injection method

Potentiometer Method

Yadda ake gudanar da wannan takaito ce mai kyau. A kan, ana saka wani resistor da yawan daidai a kan field winding da kuma exciter. Ana tsakiyar wannan resistor da kaɗan kuma ana saka shi zuwa ground bayan voltage sensitive relay.

Kamar yadda ake iya tabbatar da shi a cikin hanyar, wani abu a cikin field winding ko exciter circuit zai maimaita relay circuit tun daga hanyar path da ya faru zuwa ground. Duk da haka, akwai voltage za su faru a kan relay saboda potentiometer action na resistor.

Wannan kyau na bincike da takaitaccen rotor earth fault protection na musamman ya faru da hadadin mai zurfi. Yana iya mayar da abubuwa masu earth faults kawai a cikin wurare kafin ba a kan center ta field winding ba.

AC Injection Method

A kan, ana saka wani voltage sensitive relay a wani wurar field da kuma exciter circuit. Wannan terminal na biyu na voltage sensitive relay ana saka shi zuwa ground bayan capacitor da secondary of one auxiliary transformer kamar yadda ake iya tabbatar da shi a cikin hanyar.

Idan akwai wani abu a cikin field winding ko exciter circuit, relay circuit zai maimaita tun daga hanyar path da ya faru zuwa ground, kuma kuma voltage na secondary ta auxiliary transformer zai faru a kan voltage sensitive relay, kuma relay zai yi aiki.

Hadadi mai zurfi na wannan system shine, akwai muhimmanci wajen leakage current tun daga capacitors zuwa exciter da kuma field circuit. Wannan zai iya sa unbalancing a cikin magnetic field, kuma kuma zai iya haɓaka mechanical stresses a cikin machine bearings.

Muhimmanci mai zurfi na biyu na wannan takaito shine, yana ƙirƙira wani voltage source na biyu don aiki na relay. Saboda haka, takaitaccen rotor zai ci gaba idan akwai failura a cikin AC supply.

DC Injection Method

DC injection method yana ƙarin bayyana problem na leakage current da ake samu a cikin AC injection method. A kan, ana saka wani terminal na DC voltage-sensitive relay zuwa positive terminal na exciter, kuma ana saka terminal na biyu zuwa negative terminal na external DC source. Wannan DC source ana bayyarta ne tun daga auxiliary transformer da bridge rectifier, da positive terminal na ta ground.

Kamar yadda ake iya tabbatar da shi a cikin hanyar, idan akwai wani field earth fault ko exciter earth fault, positive potential na external DC source zai faru zuwa terminal na relay wanda aka saka shi zuwa positive terminal na exciter. Hakan yana iya faru output voltage na rectifier a kan voltage relay, kuma relay zai yi aiki.

Mahimmancin Mayar Da Abubuwa

Mayar da abubuwa da kuma gyaran abubuwan rotor earth faults yana da mahimmanci wajen inganta unbalanced magnetic fields da kuma karkashin mechanical damage a cikin alternators.