Farkon Kayan Aiki ko Farkon Tashin Karamin Turbin ko Jenereta

Gajer da fadin ko karamin fadinsa zai iya faru ne a jeneratori saboda gajer da fadin. A jeneratorin da suke da muhimmanci, darajan da ke fadin ana yau da shi daga masana'antar taimakawa ko daga jeneratorin DC da ya yi. Gajer da taimakawa ko gajer da motar da ya yi zai iya ba da gajer da fadin a jeneratori. Gajer da fadin wanda yana nufin gajer da tsarin fadin a jeneratori zai iya ba jeneratorin da suka ci abin da ya fi yawa da wasu saki.
A wannan lokacin, jeneratorin ko alternator zai zama jeneratorin induction wanda ke magance darajan da ke fadin daga system. Ba haka wannan yanayi ba za a iya ba da wahala a system a baya, amma karshen darajan da ke stator da karshen rotor saboda ciyar da machine a wannan mode zai iya ba da wahala a system a gaba. Saboda haka, ya kamata a yi al'amuran mai kyau don inganta tsarin fadin ko karamin fadinsa a jeneratori bayan gajer da shi. Jeneratorin ya kamata a haifi daga cikin system har zuwa muka inganta tsarin fadin.

Akwai kuma biyu na ayyukan da ake amfani da su don inganta gajer da fadin ko karamin fadinsa a jeneratori. A ayyukan da ta, ana amfani da relay na undercurrent wanda ana kofara shi a cikin tsarin fadinsa. Wannan relay zai yi aiki idan darajan da ke fadin ya zama da kadan da aka tabbatar. Idan relay ya kamata a yi aiki saboda gajer da fadin faɗa, ya kamata a tabbatar shi da kadan da yake da kadan da ke 8% na darajan da ke full load darajan. Sauran lokacin, idan gajer da fadin ya faru saboda gajer da exciter amma ba saboda abu a cikin tsarin fadin (tsarin fadin ya zama daidai), zai kasance darajan da ya faru a slip frequency a cikin tsarin fadin. Wannan yanayi zai iya ba relay da aiki kan pick up da drop off a cikin slip frequency da ya faru a cikin tsarin fadin. Wannan abin da ya faru zai iya inganta a haka.

A wannan lokacin, an samun 5% na darajan da ke normal da full load darajan. Akwai contact na normally closed wanda ana kofara shi a cikin relay na undercurrent. Wannan contact na normally closed zai zama open idan coil na relay ya ci darajan da ke fadin a cikin tsarin fadin a lokacin da aiki na tsarin fadin. Bayan da abu da ya faru a tsarin fadin, coil na relay zai zama de-energized da contact na normally closed zai zama close supply across coil na timing relay T1.

Idan coil na relay ya ci darajan, contact na normally open na relay T1 zai zama close. Wannan contact zai close supply across timing relay T2 da adjustable pickup time delay da 2 zuwa 10 seconds. Relay T1 ya zama time delayed on drop off don inganta scheme saboda effect na slip frequency. Relay T2 zai close contacts after prescribed time delay don either shut down set ko initiate alarm. Ya zama time delayed on pickup don kare aiki na scheme a lokacin fault na external.


A jeneratorin da suke da muhimmanci ko alternator, ana amfani da ayyukan da yake da mahimmanci don hakan. A jeneratorin da suke, ana tambayar a trip machine bayan certain prescribed delay a lokacin da swing condition ya faru saboda gajer da fadin. Kuma ya kamata a yi subsequent load shedding don inganta stability na system. A wannan ayyukan, ana amfani da automatic imposition of load shedding to the system if field is not restored within described time delay. Scheme comprises offset mho relay, and instantaneous under voltage relay. Idan ake so ku, ba a mustace a haifi jeneratori bayan da gajer da fadin, idan ba a faru disturb na system stability.
Muna sanin cewa voltage na system shine main indication of system stability. Saboda haka, offset mho relay ya kamata a shut machine down instantaneously when operation of generator is accompanied by a system voltage collapse. Drop in system voltage is detected by an under voltage relay which is set to approximately 70 % of normal rated system voltage. Offset mho relay is arranged to initiate load shedding to the system up to a safe value and then to initiate a master tripping relay after a predetermined time.

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