Mar. 15, 2022
Generator program reverse power protection
The generator program inverse power protection is mainly to prevent the generator from suddenly opening the motor outlet switch, and all the main valves of the turbine cannot be closed under a certain load. In this case, the turbine generator set is prone to overspeed or even out of control. To avoid this, for some non-short-circuit fault protection, it first closes the main valve of the turbine after sending out the action signal. After the generator inverse power relay is operated, the signal of closing the main valve is formed and the gate is formed. After a short time limit, the program inverse power protection is formed and the operation is completely stopped.
Reverse power protection and program reverse power protection difference
Reverse power protection is to prevent the generator from reverse power into a motor, driving the turbine rotation, resulting in turbine damage. After all, I'm afraid the prime mover will run with the system because of lack of power!
Programmed reverse power protection is designed to prevent the turbine from overspeed after the generator set is suddenly disconnected and the main valve is completely closed, which can be avoided by using reverse power. The bottom line is that the prime mover is too powerful to cause the unit to overspeed!
So strictly speaking, reverse power protection is a relay protection of the generator, but mainly to protect the turbine. Program reverse power protection is not a protection, but an action procedure set to achieve program trip, also known as program trip, commonly used in shutdown mode.
The key is that as long as the fixed value is reached, the reverse power will trip. In addition to the fixed value, the program reverse power also requires closing the steam turbine main valve, so the reverse power action at the moment of grid-connection must be avoided when the unit is started.
When the generator has reverse power (external power points to the generator, that is, the generator becomes the motor condition), the reverse power protection action circuit breaker trip. Three phase voltage and two phase current signals need to be collected.
Because of the different forms of primary energy, different generators can be made. With the cooperation of water resources and water turbine, a hydro-generator can be made. Due to the difference of reservoir capacity and head drop, hydrogenerators with different capacity and speed can be made. Using coal, oil and other resources, and boiler, turbine steam engine, can be made into turbo-generator, this kind of generator is mostly high-speed motor (3000rpm). In addition, there are all kinds of generators using solar energy, wind energy, atomic energy, geothermal energy, tidal energy, biological energy and so on. In addition, because of the different working principles of generators, they are divided into DC generators, asynchronous generators and synchronous generators. In widespread use of large generators are synchronous generators.
Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. established in 2006, is an manufacturer of diesel generator in China, which integrates design, supply, commissioning and maintenance of diesel generator set. Product covers Cummins, Perkins, Volvo, Yuchai, Shangchai, Deutz, Ricardo, MTU, Weichai etc. with power range 20kw-3000kw, and become their OEM factory and technology center.
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