Switch power source for digital relay protection
A technology of relay protection and switching power supply, which is applied in emergency power protection, electrical components, and adjustment of electrical variables. It can solve the problems of reducing power supply reliability and increasing the power factor ratio, and achieves the effect of simple and effective circuits and meeting the timing requirements.
Inactive Publication Date: 2009-07-08
SOUTHEAST UNIV
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Problems solved by technology
[0005] The current power supply used in digital relay protection devices generally only has 5V output with short-circuit protection and output overvoltage protection. With power supply, 5V is established before 24V, and without power supply, 5V is later than 24V, which reduces the power supply. Reliability, increase the power factor ratio in the misoperation of the relay protection device
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[0022] figure 1 Among them, the switching power supply for digital relay protection is composed of input circuit 1, main power circuit 2, power output abnormality protection module 3, start-up sequence controller 4, and shutdown sequence controller 5. The output terminal of input circuit 1 and the shutdown sequence control 5, the main power circuit 2 is connected, the output terminal of the shutdown timing controller 5 is connected to the 24V power switch control circuit 24 in the main power circuit 2, and the 5V, 15V, and 24V three-way output power in the main power circuit 2 are correspondingly connected to the power supply The input ends of the 5V power monitor 31, the 15V power monitor 32, and the 24V power monitor 33 in the output abnormality protection module 3, the output ends of the 5V power monitor 31, the 15V power monitor 32, and the 24V power monitor 33 are respectively connected to The input terminal of the abnormal power supply controller 34, the output terminal ...
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The switching power supply for digital relay protection is a switching power supply that meets the special technical index requirements of digital relay protection devices for power supplies. It consists of input circuit (1), main power circuit (2), power output abnormality protection module (3), Composed of a start-up sequence controller (4) and a shutdown sequence controller (5), the three outputs of power supply 5V, ±15V, and 24V are respectively equipped with voltage monitoring circuits, and jointly control the power supply pulse width modulation chip to realize output overvoltage and undervoltage protection. When the output is short-circuited, it will cause a voltage drop, and the short-circuit protection is indirectly realized through the output under-voltage protection circuit. When the power is turned on, the 5V delays the opening of the 24V output through the control circuit, so that the startup and establishment of 5V precedes the 24V. When the power is turned off, the power-off sampling circuit quickly cuts off the 24V output. 5V is later than 24V.
Description
technical field [0001] The invention is a switching power supply designed for some special technical index requirements of a digital relay protection device for a power supply, and belongs to the technical field of electric power system relay protection. Background technique [0002] With the large-scale application of digital relay protection devices in substation automation systems, the reliability of relay protection devices has become a very important issue. The performance of the power supply that is part of the protection device directly affects the overall reliability of the relay protection device. The switching power supply for digital relay protection is a multi-output power supply. The input is AC and DC, and the output has three sets of voltages. Switch input and output circuits. Compared with the conventional power supply, the power supply for relay protection has added some special technical indicators, such as output overvoltage and undervoltage protection, ...
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IPC IPC(8): H02H1/06H02M1/14H02M1/32H02M1/36H02M3/156
Inventor 胡敏强赵上林窦晓波吴在军杜炎森郑建勇秦申蓓张如瑶
Owner SOUTHEAST UNIV