Electronic controller for residual current protection
An electronic control device and residual current technology, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of loss of leakage protection function, safety, reliability impact, power circuit failure, etc. problem, to achieve the effect of improving safety and reliability, strong anti-interference ability, and good electromagnetic compatibility
Inactive Publication Date: 2004-02-18
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT) +1
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Problems solved by technology
In addition, when a lightning strike occurs, a large overvoltage will inevitably be generated between the conductor 11 and the conductor 13. At this time, the piezoresistor 9 is turned on, and the current flowing through the detection winding 20 is detected by the leakage detection circuit 8, causing the user to overvoltage. voltage fault is misjudged as a leakage fault; and the power circuit 5 is connected to the two phases connected by the conductor 11 and the conductor 13. When any phase of the two phases is open, the power circuit cannot work, thereby losing the entire leakage (remaining current) protection function
Therefore, it affects the safety and reliability of leakage (residual current) circuit breakers
Method used
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[0012] see figure 2 , the rectification circuit is composed of a current limiting circuit, an overvoltage protection circuit, and a three-phase bridge rectification circuit; the current limiting circuit is connected to the three-phase bridge rectification circuit and the overvoltage protection circuit. The three-phase power line is connected to the current-limiting circuit composed of current-limiting resistors R101-103 before passing through the zero-sequence current transformer. The overvoltage protection circuit composed of resistors RV101~RV103 suppresses the high-voltage disturbance voltage introduced by the three-phase power supply terminal, and at the same time sends it to the three-phase bridge rectifier circuit composed of diodes VD101~VD107 for rectification, and the rectified output DC voltage is removed The other end of R101 is connected to RV101, one end of RV103, the anode of VD106 and the cathode of VD107, the other end of R102 is connected to the other end of ...
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The invented electronic control equipment includes commutating circuit, voltage-stabilizing circuit, detection circuit, silicon-controlled trigger circuit and simulation test circuit. Said invention can separate and trip circuit, when the residual current of three-phase circuit is reached to set value, at the same time, when any phase of three-phase circuit is failed, it also can obtain working power source from other two phases, and when the residual current of these two phase is reached to set value, the three-phase circuit can be separated and tripped so as to make reliable residual current protection, and its electromalgnetic compatibility is good.
Description
technical field [0001] The invention relates to an electronic control device for residual current protection, belonging to low-voltage power distribution protection devices. Background technique [0002] The current residual current protection device, such as the patent No. 94214193.8 applied for on June 14, 1994, is called "residual current action protector" and the patent No. 96239347.9 applied for on December 11, 1996, named "intelligent centralized control Type residual current action protection device", none of which can meet the requirements of residual current protection when the three-phase circuit is open, and the electromagnetic compatibility performance is not high, which affects the use of the product in terms of safety and reliability. The public number published by Japan on July 21, 1998 is JP10191552A, and the name is "overvoltage detection circuit of leakage circuit breaker". The tripping coil is connected to the AC power supply through the conductor 11. Les...
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IPC IPC(8): H02H3/32H02H3/34
Inventor 杨学军黄正忠徐伟严伟青潘振克王峰
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)