BYKCS-△-80kvar Series High - Power Thyristor Switch for Industrial Applications with Fast - Acting Components Heavy Duty Controller Thyristor Switch 450V

Model meaning

Main Specification of BYKCS-△-80kvar

Product Introduction of BYKCS-△-80kvar Series Non-contact Thyristor Switch

Technical Advantages of BYKCS-△-80kvar Series Thyristor Switch

Thyristor Switch can work without mechanical contact movements, precluding arcing, sparking, and audible switching noise. They manage voltage transients within safe limits using zero crossover switching techniques, and VTSM can switch capacitors at rates greater than 1000 mS; a speed that contactors cannot achieve. Another set of advantages is that the number of switching operations for thyristors is unlimited, unlike for contactors.

zero cross switching

• Methods to realize the current zero-cross cut off are: just normalize the zero-cross triggering at first minute of voltage zero cross during switching off; after that stabilize and activate the magnetic latching relay so it will operate and then disconnects the relay when it's already switched off; then the thyristor will do the timing delay to zero cross switch off - to enable the current zero-cross cut off function.

voltage phase failure protection

• The switch will refuse closing operation when the supply system voltage is under a phase failure. After being to switch on the system at that point again if phase failure happens, the system will refuse the operation of the switching on automatically.

under voltage protection

• The switch refuses the closing operation if the voltage is 20% or less than the rated voltage (220v). It will protect itself; the system continuously monitors the operational state of the thyristor and the magnetic latching relay; should a fault occur, the system will refuse the making operation, and it will either exit the switch on operation or conduct the breaking operation.

power failure protection

• Tripping and switching off automatically if after switching on the power goes off immediately. 

no harmonic wave making

• During conduction the thyristor does the zero cross triggering operation, after delaying relay attracts and conducts and thus the attraction and conduction of relay won't lead to harmonic wave production. 

low power consumption

• Given the way how the control device using the magnetic latching relay will always consume energy at the time of switching operation, it can't normally use any energy in normal cases and due to the small contact resistance of such a magnetic latching relay, there will not even be any development of heat, thus there will not be the need to use a radiator fan this will cut down cost involved and completely prevent burning of the Thyristor and other electrical appliances running using this system to save energy and undue consumption. 

photoelectric isolation between the input signal and compound switch

• Strong interference resistance and reliable and safety operation ,the products adopt the advanced intelligent control technology and the latest electronic elements ,compared with the similar products ,It has ultra high performance in the respect of inrush current and reliability.

The Working Process of Thyristor Switch

Trigger Phase:To facilitate conduction via the BYKCS series thyristor switch, two conditions must be satisfied:

• Forward Anode-Cathode Voltage: This means that the anode (A) is positively connected to the power supply and the cathode (K) negatively, thus creating forward bias.
• Gate Trigger Signal: A brief positive pulse current (example, 5-50 mA) is applied to the gate (G) to trigger conduction into the internal PNPN structure. At this point, the entire opto-isolation circuit safeguards electrical isolation between the control signal and the main circuit.

Conduction Holding Phase:

• Once triggered, it enters the latching state, which means even if the gate signal disappears, the device continues to conduct as long as anode current is higher than the holding current which is quite a few hundred milliamperes to a few amperes.The current flows through the parallel thyristor module, thus ensuring stable control over high power loads such as Low Voltage Motor. Simultaneously, a cooling device such as air cooling, heatsink maintains the temperature below 85 degrees celsius for reliability.

Turn-Off Phase:

• Natural Turn Off: When the anode current drops below the holding current or a reverse voltage is applied, the thyristor comes back to its blocking state.
• Forced Turn-Off: An infusion of reverse voltage is passed through an external circuit (for example, capacitor discharge) which abruptly interrupts the flow of current. This is appropriate in scenarios of high-frequency switching.

Wiring Instructions for BYKCS Series 450V Thyristor Switch

The BYKCS series thyristor switch adopts standardized industrial design, with a concise and efficient wiring method to ensure safety and stability. The main power terminals (L1/L2/L3) should be connected to the three-phase power supply (450V AC) and the neutral line (N), and be reliably connected to the system grounding grid through the grounding terminal (PE) to eliminate electrical interference and leakage risks.The control signal interface (IN+/IN-) supports 0 - 10V analog signals or PWM pulse inputs. It should be connected to the external controller with shielded twisted-pair wires, and ensure that the opto-isolation circuit effectively blocks the common-mode voltage to prevent voltage fluctuations from impacting the control end.When wiring the trigger circuit, the drive signal wire should be connected to the trigger signal port (TRIG), and the phase and amplitude of the external trigger source should be synchronously matched to ensure the precise conduction of the thyristor module.For the protection circuit, an overvoltage protection module (OVP) and an overcurrent protection sensor (OCP) need to be externally connected to monitor the line status in real time and automatically cut off abnormal currents.When installing the heat dissipation device, heat dissipation space should be reserved. The power supply of the heat dissipation fan should be connected to an independent circuit (12/24V DC), and ensure that the air duct is interlocked with the temperature sensor to maintain the operating temperature below 85°C.After wiring is completed, an insulation tester should be used to verify the electrical isolation performance to avoid equipment failures caused by wiring errors.

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