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Relay protection in the power system 6-10 kW
Relay protection in the power system 6-10 kW
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机译：电力系统中的继电保护6-10 kW
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摘要
The purpose of the utility model is to improve reliability by eliminating moving mechanical parts and reduce the size of the relay RT-85 and use of energy for the circuit breaker failure 6-10 kV. The signals from the sensors 7, 8 located on the magnetic core whose primary winding is connected in series with a current transformer and the protected circuit 6-10 kV breaker trip coil are input to rectifiers 9, whereby negative half-wave signals are clipped, then from these pulses via differential amplifiers 12, 13 reference signals are subtracted 10, 11, which are defined setpoint overcurrent protection and current cutoff, respectively, as the output signals are amplified using the same differential strengthen Leu 12, 13. Further, the output signals via comparators 14 are converted to square pulses and are input to the microcontroller 15. To control the amount of current and then performing a response speed depending on the magnitude of the flowing current of the protected circuit with a differential amplifier 12 the output pulses are supplied to low pass filter 18 wherein the smoothed and ready signal is input to an analog-digital converter of the microcontroller 15. to set the time delay overcurrent protection is used for sensor time setting 17, the signal from which is fed to the second input of the analog-digital converter of the microcontroller 15. Microcontroller 15 outputs the signals to drivers 16 which control the operation of triacs 4 and 5. When actuation of one of the protections occurs deshuntirovanie electromagnet 6 circuit breaker 6- 10kV: first triac 5 is opened, and then with some delay triac 4.
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