As one of the key equipment of the digital substation, the electronic transformer consists of one or more voltage or current sensors connected to the transmission system and the secondary converter for transmitting proportional to the measured quantity, supplying measuring instruments, meters and relays. Electrical protection or sensing methods have a great influence on the structural system of electronic transformers. The basic performance of the electronic transformer is briefly described below.
The optical principle of the electronic transformer has a simple structural system and is a passive electronic transformer. The electronic transformer of the principle of electromagnetic measurement is an active electronic transformer.
The basic performance of the electronic transformer is as follows:
High and low voltage completely isolated, high safety, excellent insulation performance, no iron core, eliminating magnetic saturation and ferromagnetic resonance. The measured signal of the electromagnetic transformer is coupled with the secondary coil through the iron core, and the insulation structure is complicated, and the cost increases exponentially with the voltage level. The unconventional transformer transmits the high-voltage side signal to the secondary device through the optical fiber with good insulation performance, which greatly simplifies the insulation structure, and the higher the voltage level, the more obvious the cost-effective advantage.
There is no danger of being flammable or explosive due to oil filling. The insulation structure of the unconventional transformer is relatively simple, and oil is generally not used as the insulating medium, which does not cause fire and explosion hazards.
Small size and light weight. Unconventional transformers have no iron core and are much smaller than electromagnetic transformers of the same voltage class.
The dynamic range is large, the measurement accuracy is high, and the frequency response range is wide. When the grid is in normal operation, the current flowing through the current transformer is not large, but the short-circuit current is generally large, and as the grid capacity increases, the short-circuit current becomes larger and larger. Unconventional transformers have a wide dynamic range that meets both measurement and relay protection needs.
The anti-electromagnetic interference performance is good, and there is no danger of open circuit high voltage on the low voltage side. There is only fiber connection between the high voltage side and the low voltage side of the unconventional transformer. The signal is transmitted through the optical fiber. The high voltage circuit is completely electrically isolated from the secondary circuit. The transformer has better anti-electromagnetic interference capability, and the low voltage side has no open circuit. High voltage danger.
Data transmission has strong anti-interference ability. Electromagnetic transformers transmit analog signals. Measurement, control and relay protection in power stations have traditionally transmitted electrical signals measured by electrical sensors to the control room via coaxial cables.
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Label: Analyzing the basic performance of electronic transformers
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