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2025-03-24 07:25本頁面
【正文】 tches. Disconnect witches have isolation and connection capability without interruption capability. Busbars Bus bars arc connecting bars or conductors between equipment. Flexible conductor are stretched from insulator to insulator, where more mon solid buses(monly made of aluminum alloy)are installed on insulators in the air or in gasenclosed cylindrical pipes Shunt reactors Shunt reactors are often required for pensation of line capacitance where long lines are involved Shunt capacitors Shunt capacitors are often required for pensation of inductive ponents of load current Current transformers and potential transformers， Current transformers and potential transformers are for measuring currents and voltages and provide proportionately lowlevel currents and voltages for control and protection Control and protection， Control and protection include a) a variety of protective relays which can rapidly detect faults anywhere in the substation equipment and lines, determine which part of the systems is faulty ,and give appropriate mands for opening of circuit breakers 。(c) faultrecording equipment 。 and (f) auxiliary power supplies. Many of the control and protection devices are solidstate electronic types, and there is a trend toward digital techniques using microprocessors. most of the substations are fullv automated locallv with a provision for manual override .the minimum manual interface required ,alone munications channels to the dispatcher in the central office. Good substation grounding is very important for effective relaying and insulation of equipment。 and all equipment groundings points ,tanks, support structures, fences ,shielding wires and poles ,and so forth ,are securely connected to it， the is reduced to be low enough
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