变电站设备作用（Substation equipment）.docVIP

变电站设备作用（Substation equipment） Function of substation equipment.Txt Substation equipment role * shunt reactor action To reduce the capacitive effect in the no-load or light load line, to reduce the power frequency over-voltage, and to compensate the secondary supply current by the neutral point grounding through the small reactance, so as to accelerate the extinction of the arc of the submerged arc generator. Arc suppression coil Petersen coil is a coil with iron core, the core has a gap, in order to get larger inductor current, grounding coil side has a plurality of taps, in order to regulate the inductor size grading in a certain range. The arc suppression coil is usually connected to the neutral point of the transformer or generator. It is mainly used in neutral point non direct grounding power system. When the single-phase metal grounding fault occurs, the ground capacitive current is compensated so that the value is within the allowable range. * role of instrument transformer The transformer is a transformer that transforms high and large currents into low voltage and current suitable for instrumentation or protection devices. The role of: Mutual inductor and measuring instrument are used to measure the voltage, current and power of the equipment and the line. Transformer and relay or protection device cooperate to protect the electrical equipment and power system equipment. The transformer can make the measuring instrument, the relay protection device and the electrical equipment isolated from the high voltage, and ensure the personal safety of the attendant and the safety of the two equipment. Change the voltage and current of the circuit into a unified standard value, so as to standardize the two equipment such as instrument, relay and so on * isolating switch The isolation switch function: electrical equipment and charged part are separated, in order to ensure the electrical equipment can be safely performed maintenance or troubleshooting; operation mode cha