The TSCK series thyristor zero crossing switching group is mainly composed of high-power anti parallel thyristors, trigger circuits, protection circuits, heat dissipation devices, overheating protection, connecting copper bars and other components. It has self synchronization function, eliminating the trouble of identifying synchronization and phase sequence in traditional thyristor circuits. It has superior self detection zero crossing signals and is safe and reliable. As a switching device that utilizes a thyristor contactless switch, it can quickly and smoothly switch capacitors in or out based on the precise triggering characteristics of the thyristor.
The TSCK series thyristor zero crossing switching group can quickly track sudden changes in impulse loads, provide closed-loop feedback on the optimal power factor, achieve dynamic reactive power compensation, reduce voltage fluctuations, and achieve the goal of energy conservation and consumption reduction. The capacitor switching for fast dynamic compensation or filtering in 380V~1140V AC systems is an upgraded product in the field of low-voltage reactive power compensation control.

working principle
The triggering circuit takes the voltage at both ends of the thyristor switch and sends it to the optocoupler through a resistor. When the instantaneous value of the AC voltage is equal to the residual voltage of the capacitor, the voltage on the thyristor is zero, and at this time, one negative pulse is output from the optocoupler. This pulse has a width of approximately 150 μ s. After the pulse is reversed and in phase with the input command, the multi harmonic oscillation circuit is activated to output the pulse. Then, the power amplification and isolation circuit are used to trigger the corresponding thyristor. Once triggered, the thyristor remains conductive and the corresponding capacitor is put into operation. Due to the voltage at the back end of the thyristor being close to zero, as long as the input command exists, the trigger pulse train will continue to output, ensuring reliable conduction of the thyristor. When the input command is cancelled, the triggering pulse stops, and the thyristor disconnects when the current crosses zero. It is not until the next input command is issued by the microcontroller that it chooses to restart at the zero voltage point; The excellent thermal conductivity of the heat sink and the addition of the cooling fan greatly improve the heat dissipation effect of the switch. The device has a built-in over temperature protection switch and a temperature switch that controls the automatic operation of the fan, providing good conditions for safe operation.

Technical characteristics of TSCK thyristor zero crossing switching switch

Applicable voltage: three-phase 380VAC~1140VAC ± 10% 50Hz
Fan power supply: 220V AC ± 10% 50Hz
Input signal: Three phases are independently controlled (co compensated or separately compensated), DC 12V control voltage or passive contact input control, etc;  
Trigger output: using a pulse transformer with six wide pulse columns for triggering, with stable and reliable performance;  
The LED signal light displays the switching status;  
Voltage zero crossing input, current zero crossing cutoff;  
Zero crossing switching, no surge, no impact, no spark generation, will not cause grid flicker;  
Optoelectronic isolation, strong anti-interference ability, fast response speed, can complete the switching action within 20ms.  
Adopting fully controllable silicon dynamic switching, high service life, and high reliability.  
Allow frequent switching, integrated integration, strong interchangeability, and simple and convenient maintenance;  
Equipped with over temperature protection and over temperature lockout function
Built in cooling fan, automatic control of fan start and stop;  
Transient voltage suppression protection circuit;  
Can be directly used in conjunction with reactive power compensation controllers;

Model Description


TSCK0.48-30-3W meaning explanation: The thyristor zero crossing switching capacitor switch group adopts a three-phase capacitor rated voltage of 480V, a three-phase compensation total capacity of 30kvar, a capacitor wiring method of outer triangle, and a three-phase common compensation switching control method.
TSCK0.28-30-1Y Explanation: The thyristor zero crossing switching capacitor switch group adopts a single-phase capacitor rated voltage of 280V, a three-phase compensation total capacity of 30kvar, and a compensation capacity of 10kvar for each phase of the unit branch. The capacitor wiring method is star zero connection, and the single-phase partial compensation switching control method is used.
TSCK0.28-30-3N meaning explanation: The thyristor zero crossing switching capacitor switch group adopts a single-phase capacitor rated voltage of 280V, a three-phase compensation total capacity of 30kvar, a unit branch phase compensation capacity of 10kvar, a capacitor wiring method of internal triangle, and a three-phase common compensation switching control method.
TSCK0.28-30-1N Explanation: The thyristor zero crossing switching capacitor switch group adopts a single-phase capacitor rated voltage of 280V, a three-phase compensation total capacity of 30kvar, a unit branch phase compensation capacity of 10kvar, a capacitor wiring method of internal triangle, and a single-phase sub compensation switching control method.

Wiring legend

Outline diagram and selection dimensions