Intelligent Thyristor Switch


  • The ZvarTRONIC thyrisotr module is intended to be used in power factor correction panels, where a fast compensa is required due to very fast variation of the inductive load. Example fast compensation applications are: Welding machines, Presses, Elevators, Cranes, Wind turbines.
  • Thyristor is normally controlled by a fast power factor controller.
  • Thyristor is also able to switch inductive load with decompensation reactors, but only with switching cycle greather than 5 seconds.

Technical data

Network voltage (main circuit)380 … 480 V AC, 50/60 Hz
Maximum operation current108 Amp RMS
Maximum operation power75 kvar or 3x 40 kvar single-phase / 400 V AC 50Hz
Load typeCapacitive, Resistive, Inductive (decompensating reactors)
Supply voltage230 V AC, 50/60Hz
Control voltage230 V AC, 50/60Hz or 12 … 24 V DC
Switching time by AC controlMaximum 11ms/td>
Switching time by DC controlMaximum 10ms
MonitoringCapacitor, and reactor temperature montoring, Operation status, and Alarm presence via 4 LEDs,
Output relaysNormally open, Maximum 7A AC1
Power dissipation (W)Maximum: (W) = 2 • I (A); 2 • 108A = 214W
Fuses (main circuit)Quick fuse (gF) NH00; Current = In • 1.05 to In • 1.3
Dimensions (mm)130 x 245 x 220 (W x H x D)
Conformity to standardsIEC/EN 60947-4-3; IEC/EN 61000-6-2; IEC/EN 61000-6-4
Mounting positionVertical or Horizontal, minimum 150mm distance upwards and downwards
Operating ambient temperature with nominal load-25 … +45 °C without derating
Weight / Protection degree5.7kg / IP-00

Vertical mounting

Horizontal mounting

Connection diagram - Possible control circuits wirings

230 V AC thyristor control by Power Factor Controller with relay outputs

24 V DC thyristor control by Power Factor Controller with transistors outputs

24 V DC thyristor control by Power Factor Controller with transistors outputs for asymmetric compensation

Connection diagram - Possible control circuits wirings

Auxiliary control and monitoring circuits

Mechanical dimensions

Connection diagram - Possible main circuits wirings

Open delta loop for single-phase capacitors

Regular Delta or Star 3-phase capacitors Also for 3 single-phase capacitors with Neutral for asymmetrical compensation

Module interface - Description of functions

The ZvarTRONIC thyristor module requires 230V AC power supply supplied to the terminals (3), diode (2) indicates correct power supply and device ac ve status. The diodes (1) indicate the status of each of the main current poles, they can operate independently or simultaneously depending on the selected control method. The module has func ons to monitor the opera ng status of the capacitor and protec ve reactor (detuned, or current limi ng), also controls the integrated fan. The diode (4) indicates the status of monitored elements. During the thyristor opera on, the diode may not light up at all, then there is no excita on or alarm, this is normal. The diode (4) can signal the pulse with a long pause (state specified on the graphic (5a)). It also means correct opera on, but the thyristor module has reached an internal temperature that requires ac ve cooling. Then the contact (11) requiring 230V power supply from the phase terminal (3) switches on. The contact (11) powers the integrated fan of the module, it can also be used to power the addi onal fan in the compensa on system housing. The contact (11) can addi onally be triggered by the AUX input (16) by providing "+" from the 12V-24V DC control circuit. This func on can be useful to force addi onal cooling in the cabinet even when the thyristor module is cold, but the temperature in the cabinet has reached high value. Input (16) can be controlled by Power Factor Controller. If the module is insufficiently cooled, overheats and automa cally turns off, the module will signal overhea ng by means of the diode (4) status (5d). The module has two external thermistors for monitoring the capacitor (10) and the reactor (9). The thermistors have a common ground GND (8). The poten ometer (6) is used to set the temperature limit of the capacitor, by default it can be 60 °C. A limit value of 100 °C can be assumed on the poten ometer (7) for the choke. These values may vary depending on manufacturer's recommenda ons. In the event of the capacitor overhea ng above the set temperature on the poten ometer (6), the module will signal through the diode (4) one long signal and one short with a break, according to formula (5b). When the choke reaches a higher temperature than the set limit on the poten ometer (7), the diode (4) will signal one long signal and two short according to formula (5c). Each of the alarm states: 5b; 5c; 5d, if it is ac vated, it will permanently disconnect the main circuits, even if the alarm condi on stops, the device must be reset by disconnec ng the power supply voltage (3). The thyristor module has the ability to control by two types of voltage. All current circuits can be switched on only simultaneously with the AC voltage (13). DC voltage between terminals (14-15) enables independent control of current circuits by supplying voltage to any terminal L1; L2; L3 independently, or you can bridge these terminals and control all circuits simultaneously.