TSC Structure

Thyristor Switched Capacitor Structure

The thyristor-switched capacitor bank (TSC/TSF) is composed of controller, capacitor, reactor, thyristor, and other components.

1. Controller

a. Conduct digital control signal processing and real-time control calculation based on the DSP. The dynamic response time is less than 10ms.
b. Use multi-control methods to realize the three-phase, split-phase, reactive power, voltage, and harmonic control as well as unified control of voltage, reactive power and harmonic.
c. Pass the EMC test with strong anti-jamming capability: ESD immunity, surge immunity, damped oscillation impulse immunity, power frequency magnetic field immunity, radio-frequency electromagnetic field immunity, etc.
d. Multi-task operation system can control capacitor banks of 16 steps maximally and detect 16-way switching values.
e. Perfect reactive power and harmonic measuring functions: AC sampling technology, four quadrant analysis, harmonic histograms, harmonic distortion rate.
f. Powerful data query and storage functions: faults record, query, and all kinds of electrical parameters and charts checking.
g. Protection against over-voltage, under-voltage, over-current, under-current, etc.
h. The standard communication ports are convenient to connect with substation's automation system to meet the requirements of quick data transmission, quick control (I/O) and remote communications.

2. Capacitor

a. Adopt self-healing low-voltage shunt capacitor, built-in protection device and built-in discharge resistance.
b. Capable of withstanding 1.35 times the rated current continuously.
c. Withstand voltage between the poles: AC 2.15Un, DC 4.3Un, 10 seconds.
d. The tolerance of a single capacitor is no more than ±2.5% and the tolerance of the entire set of thyristor-switched capacitor bank is no more than ±1.5%.
e. Three-phase capacitor tolerance: Maximum/Minimum ≤ 1.01
f. Build-in pressure protection mechanism; when the internal fault pressure increases, the capacitor will exit automatically.
g. Conform to self-healing low voltage shunt capacitor standards: IEC831-1 and GB12747-91.

3. Reactor

a. Dry-type iron-core reactor with low-loss imported cold rolled grain oriented silicon steel sheet
b. The coil adopts H-class or C-class enamelled rectangular wire, which has excellent heat dissipation performance.
c. After the reactor coil and iron core are assembled, the assembly undergoes the process from pre-heating to vacuum dipping coating to heat curing, so the structure is solid and resistant to noise and high temperature.
d. The iron-core fasteners are made of non-magnetic materials to ensure high quality factor and low temperature rise, so as to achieve better filtering effect.
e. The outer parts adopt anticorrosion treatment and the leading-out terminals are made of cold-pressed copper tubes.
f. This reactor can run continuously under 1.35 times the rated current and it can bear 20 times the rated current for 2 seconds.
g. Single phase tolerance is no more than ±1%; difference between single phase tolerance and average value does not exceed ±1% either.
h. Conform to JB5346-1998 series reactor national standard.

4. Thyristor Switch

a. Modular design: Integrated by zero-crossing triggering thyristor module, RC snubber circuit, fuse, radiator, fan, and thermo switch.
b. Imported zero-crossing triggering thyristor module
c. Input signals are coupled with control signals by optical isolation
d. Transient free and no noise produced during switching
e. Thyristor temperature is measured in real time
f. Fast response
g. Phase loss / fault phase protection
h. Maintenance free and long service life

5. Other Components

Isolation switch, lightning arrestor, fuse, and current transformer are from outstanding manufactures at home and abroad to ensure the quality of our TSC/TSF.