Ultra-Fast Current Limiter Amsa da Kudin Kudin Yawanci

UFCL-limiter, na bi fault current limiter da yake amfani da pyrotechnic technology, shi ne amsa teknologi a cikin masu fasaha da aka faruwa a matsayin bayanin da suka faruwa a kan short circuit current inda ana yi ziyarar system, amma kuma ya ba da kyau a canzawa dukkan protection switchgear.Faults a cikin electrical power systems sun hada. Ba tare da haskancin da ke faruwa a nan fault - misali, saboda abubuwan electric arc - fault currents da ke faruwa daga sources zuwa wurin fault sun haɓaka dynamical da thermal stress ga equipment kamar bus-bars, transformers, da switchgears. Circuit-breakers suna da kyau a yi (selectively) interrupting the currents associated.

Amma, ci gaba a generation of electrical energy da increased interconnection of the networks sun haɗa fault currents. Musamman, ci gaba a generation of electrical energy sun haɗa cewa networks suka haɗa ko kuma ta ƙarin limits su a kan short-circuit current withstand capability. Saboda haka, akwai ƙarin interest a devices da suke iya limiting fault currents. Fault current limiter zai iya trip at the very early stage of first rise and limit the first peak of the fault current passing through it.

Akwai ƙarin fa'idodi a amfani da UFCL-limiters wajen rage equipment da za su rasa aiki hata kuma idan prospective fault current yana ƙarin da rated peak and short-time withstand current and in case of circuit breakers also its rated short-circuit making and breaking current. Canzawar equipment zai iya saukar da kuma za a yi shi a lokacin daɗi. Idan network na ƙarin don sakamako, UFCL-limiters sun rage amfani da equipment da ratings ƙarin, wanda ke rage savings cost considerable. Idan network na ƙarin don sakamako, UFCL-limiters sun rage amfani da equipment da ratings ƙarin, wanda ke rage savings cost considerable.

Sometimes, UFCL-limiter is the only solution

Kamar yadda aka nuna a Figure 1 ta hanyar, an fito UFCL-limiter a bus-tie section and is series-connected to the bus coupling circuit-breaker (CB). A lokacin fault a outgoing feeder, prospective short-circuit current da ke faruwa daga outgoing feeder CB (Ik") zai iya haɗa 80kArms, wanda ke ƙarin da peak current of 200kAp. Wannan yana ƙarin da ratings of the CB (40kArms and 100kAp). Bisa ga haka, CB bai iya ba protection against this high peak short-circuit current and the operation speed of the CB is too slow. Wannan zai haɗa serious mechanical and thermal stress and eventually equipment failure.

Amma, saboda high operation speed and current limiting capabilities of the UFCL-limiter, it is possible to resolve this issue without upgrading all the equipment in the system. By installing the UFCL-limiter on the strategic position of the bus-tie, the short-circuit current i2 contributed by T2 is limited at the rise of the first cycle and interrupted before the prospective current i2 reaches its peak. The total (peak) short-circuit current flowing through the CB of the fault circuit is then kept below 100kAp (i1 + i2 <100 kAp), which is the rated peak withstand current of the CB. Therefore, the CB can withstand the fault current and trip to clear the fault safely.

In comparison with complex conventional solutions, the UFCL-limiter has both technical and economic advantages when used in transformer or generator feeders, in switchgear sectionalizing and connected in parallel with reactors. There is no need for customers to upgrade all the switchgear, bus-bars cables, etc.

The advantages of the use of a UFCL-limiter in a network are:

• Reduction of the short-circuit current of the system (compared to the short-circuit current with closed tie circuit breaker)

• Reduction of voltage sags and flicker due to the lower total source impedance

• Reduction of harmonics due to the lower total source impedance

• Higher system availability due to the parallel connection of the feeding generators and transformers

• Higher loads possible in a sub-system (higher than the ratings of the feeding generators and transformers in that sub-system)

UFCL-limiter switchgear

UFCL-limiter in loose equipment supply

If you need to know about more parameters and application, Please check the model selection manual.↓↓↓