Commutating Rectifier|DC Polarity Reversing Switch Rectifier ZKGP-25000A/12V-2 with Timer Function P

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Last update: 2017-11-06 17:06
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dc polarity reversing switch rectifier ZKGP-25000A/12V-2 with timer function polarity Reversing Function

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Digest of High Current Rectifier(HCR)technical documents.

Part two of

 KHF—3600A/24V Power Supply Unit Installation and Operation Instruction 


2. Operating principle:

      The circuit for the devices contains main circuit and control circuit.

 2.1   Main circuit

       As per the accompanying diagram, the main circuit adopts double inverse star rectifying circuit, there is a switching overvoltage absorber circuit on valve side, together with phase change overvoltage protection circuit on every arm. The three-phase alternating current shall be subjected to voltage reduction through rectifier transformer, and then rectified by thyristor and finally shall be changed into direct current 3600A and 24 V voltage for output.

2.2 Control circuit (see accompanying diagram)

       It is composed of fault signal detection circuit and trigger circuit.

 2.2.1  Fault signal detection circuit

Current overload: when there is current overload in main circuit, the trigger pulse shall be blocked till fault clearance.

2.2.2  Trigger circuit

       It is composed of the DSC-6M control trigger developed by the company.

       Main electrical parameters of BS-11trigger controller are as follows:

       A. AC synchronous voltage: three-phase 18√3 V is led in by Z24.D24.Z22, the external synchronous transformer may implement Y-Δchange-over, which meets the requirement of master phase.

       B. Phase-shifting control voltage: manual/automatic 0-10v, led in by D30, control voltage leads in manual or automatic signal through KL, which shall be implemented through external change-over switch on the door of the cabinet.

       C. Phase shifting range: 0-150°electrical angle.

       D. Trigger pulse form:  double pulse modulation;

       E. Output stage adopts VMOS power tube, drive current 5A, which is led out from terminals G1,K1,G2,K2;G3,K3;G4,K4;G5,K5;G6,K6 to corresponding thyristor respectively.

       F. Non-equalization of each phase pulse: ≤±0.5°electrical angle

       G. D6,Z4 and D4 lead in 18V voltage, and to form into ±15V power supply through 7815,7915.

       H. Proportional integral is mainly composed of IC2: B, IC2: A is inverter, D30 is voltage input terminal.

 2.2.3 Automatic current stabilization process

       When the mains voltage or load changes, the feed back voltage from current transformer shall change accordingly, the difference between the changed feed back voltage and the given voltage shall be magnified by operational amplifier to output a corresponding phase shifting voltage to trigger as phase shifting so as to increase or decrease the current of the thyristor rectifier device to the given value to implement the closed loop current stabilization control.

       The current stabilization control process is as follows:

       Current stabilization process of thyristor rectifier device

        (U~)Id↑→Ud↑→UIN(U400)↑→Ut↓→α↑→U↓→Id↓趋向稳定

        (U~)Id↑→Ud↑→UIN(U400)↑→Ut↓→α↑→U↓→Id↓Trend is steady

       Vice versa

      Voltage stabilization process is similar. 



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