What is the function of a voltage transformer?
Voltagetransformer ispower generation plants, substations and other power transmission and supply systems indispensable electrical appliances.
The function of the voltage transformer is to convert high voltage into a standard secondary voltage of 100V according to the proportional relationship, for use in metering, instrumentation devices and relay protection. At the same time, the use of voltage transformers can isolate high voltage from electrical workers. For example, the actual value at both ends of the voltmeter is 100V, but the meter indication value is the primary voltage value. Voltage transformer is a specialopen circuit operation of the specialtransformer.
The primary fuse of the voltage transformer uses RN2 or RN4 fuse, also called special fuse.
The ratedcurrent of the fuse is 0.5A, and the fuse tube is filled with quartz sand, so it has good arc extinguishing ability and large breaking capacity. The fuse is made of nickel-chromium wire, with a totalresistance of about 90Ω, which has the effect of limiting current. If an ordinary fuse is used instead, it can neither limit the current nor extinguish the arc, and it is likely to burn out the equipment, or even cause a larger area of power outage. Nameplate explanation of voltage transformer
1. Two JDJ-10, primary and secondary windings are both connected in V type, can only measure line voltage
2. JSJW-10 can measure line voltage and phase voltage and has insulation monitoring. Under normal conditions, the voltage at both ends of the open delta is zero. When a ground fault occurs in the system, a voltage of about 100V will be generated at both ends of the open delta, and therelay will operate to send out a ground alarm signal.
The function of the voltage transformer is to convert high voltage into a standard secondary voltage of 100V or lower level according to the proportional relationship, for use by protection, metering, and instrumentation devices.
At the same time, the use of voltage transformers can isolate high voltage from electrical workers. Although the voltage transformer is also a device that works according to the principle ofelectromagnetic induction, its electromagnetic structure relationship is just the opposite compared withcurrent transformer.
