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Zhuhai Wanlida Electrical Automation Co.,Ltd.
Email http://mail.zhwld.com
Tel +86-756-3395623
Address:Wanlida Relay Protection Industrial Park, No. 1 Technology Road, Science and Technology Innovation Coast, High-tech Zone, ZhuHai City, GuangDong Province.
 
Low Voltage Dynamic Reactive Power Compensator---TSC/TSF
Introduction
Based on DSP control technology and Instantaneous power control theory, Wanlida thyristor switched capacitor banks (TSC/TSF) with high-speed switching capability are designed to support the supply voltage of distribution systems and to correct the power factor and eliminate the harmonic current of connected loads.
Thyristor zero-crossing switching switches are resistant to mechanical wear, operate without noise, and are capable of practically transient-free switching, so it is more safety than contactor switched capacitor banks.
Applications fields
This device is widely used for small power distribution system of metallurgy, mine, petrochemical industry, communities, construction materials, machinery and motors to compensate reactive power. It dynamically compensates the impact load, eliminates harmonic, reduces line loss, stabilizes voltage, suppresses flicker, improve power factor and increases transformer loading capacity.
Functions
·         Improve power factor
·         Stabilize busbar voltage and suppress subsynchronous resonance
·         Eliminate harmonic current
·         Decrease grid loss
·         Optimize reactive power
·         Increase transformer loading capacity.
Principles
Thyristor switched capacitor banks (TSC/TSF) is the compensating device based on switching operation of capacitor banks by thyristor. TSC mainly consists of control system, thyristor, capacitors and reactors. Capacitor banks are divided into multiple units to realize step control. TSC is able to implement step regulating in reactive power, accuracy of regulating depends on numbers of multiple unit.
Thyristor switched capacitor banks (TSC/TSF) apply delta wiring. To optimize effect of reactive power compensating and harmonic filtering, TSC capacity and branch configuration must be designed according to reactive power variation and harmonic components from nonlinear load. 
 Technical features

SN
Parameters
Value
1
Rated voltage
AC220V~1140V
2
Operation voltage
0.8~1.1Un
3
Rated frequency
50Hz/60Hz (Option)
4
Capacitor wiring mode
“△”/ ”Y” (Option)
5
Switching mode
Cycle/sequence/coded combination (Option)
6
Response time
20ms
7
Allowable maximum over current
1.3 times of rated current
8
Control steps
1~12/1~16 (Option)
9
Multiple units operation mode
Parallel
10
Power loss
0.5%
11
Communication modes
Modbus/RS485/232/CAN/GPRS etc (Option)
12
IP
IP40 (customized)
13
Cooling mode
Air cooling
14
Leading in mode
Bottom/Top/Busbar (Option)
15
Altitude
1500 M
16
Ambient temperature
-200C~+500C
17
Ambient humidity
95%
18
Operation environment
No condensation, no corrupt gas, no conductive dust, no explosive and inflammable materials
19
Installation requirement
No vibration, inclination≤50
20
Switching characteristic
Current zero-crossing switching
21
Harmonic display
Measure and display 2nd ~25th
22
Phase sequence protection
Fault phase, phase loss
23
Thyristor protection
Over-temperature protection and self-recovery
24
LCD display
Real time current and voltage
25
Emergency protection
Emergency stop switch
26
Compensation mode
Three-phase compensation, phase splitting compensation
27
Protection modes
Over current, over voltage, short-circuit, quick break

Structure
Thyristor-switched capacitor banks (TSC/TSF) consists of controller, capacitor, reactor, thyristor and others.
1.     Controller
·         Process digital control signal and real-time control calculation based on the DSP. The dynamic response time is less than 10ms.
·         Applying multi-control methods to realize the three-phase, separate phase, reactive power, voltage, harmonic control and voltage, reactive power and harmonic control in unified.
·         The standard communications ports are convenient to connect with substations automation system to meet the quick data transmission, quick control (I/O) and remote communications requirements.
·         Pass the EMC test with strong anti-interference ability: ESD Immunity, Surge immunity, Power frequency magnetic field immunity, Radio-frequency electromagnetic field immunity, Damped oscillation impulse immunity etc
·         Perfect reactive power and harmonic measuring functions: AC sampling technology four quadrant analysis, harmonic distortion rate, harmonic histograms.
·         Powerful data inquire and store functions: faults record, inquire, and all kinds of electrical parameters and charts checking.
·         Multiple protection functions: over voltage, under voltage, over current, under current, switching input value etc.
·         Multi-Task operation system core can control maximum 16 steps of capacitor banks and 16-way switching values detection.
 
2.     Capacitor
·         Apply self-healing low-voltage shunt capacitor, built-in protection device and built-in discharge resistance.
·         Bear 1.35 times of over current continually.
·         Voltage withstand among poles: AC 2.15Un, DC 4.3Un. 10 seconds.
·         The single capacitor tolerance is no more than ±2.5% and the whole set of capacitor banks tolerance is no more than ±1.5%
·         Three phase tolerance of capacitor: Maximum/Minimum is no more than 1.01
·         Build-in pressure protection mechanism, when the inside fault pressure increased, the capacitor exits automatically.
·         Conform to IEC831-1 and GB12747-91 self-healing low voltage shunt capacitor standard.
3.     Reactor 
·         Apply dry-type iron-core reactor with low-loss import Cold rolled orientation silicon steel sheet
·         The coil adopted H-class or C-class enameled rectangular wire perfect appearance and heat elimination performance.
·         After assembly of reactor coil and iron-core, it passed pre-heat →vacuum dipping coating→ heat curing, so the structure is solid and resistant to high temperature and noise.
·         The iron-core fasteners adopted Non-magnetic materials to ensure high quality factor and low temperature rise, and then realize better filtering effect.
·         The outer parts adopted anticorrosion treatment, and the leading-out terminals adopted Cold-pressed copper tube terminals.
·         Bear the 1.35 times of over current continually and bear 20 times over current for 2 seconds.
·         The inductance tolerance: single phase tolerance is no more than ±1%, each phase difference to average value is no more than±1% too.
·         Conform to JB5346-1998 series reactor national standard.
  Thyristor switches      
·         Modularized design: Integrated by zero-crossing triggering thyristor module, RC absorbed circuit, fuse, radiator, fan, thermo switch.
·         Import zero-crossing triggering thyristor module.
·         Transient free and no noise during switching
·         Input signals are coupled with control signals by optical isolation
·         System measures thyristor temperature in real-time
·         Phase loss/ fault phase protection 
·         Fast response time
·         Maintenance free and long service life
4.     Other components
·         Isolation switch, lightning arrestor, fuse, current transformer are from the excellent manufactures at home and abroad to ensure TSC/TSF quality.
Technical Advantages
Thyristor switches over contactor switching

 
Thyristor switches
Electromechanical contactor
Over current during switching operations
No (Transient free)
Yes, up to 100 In according to IEC60831, in practice measured up to 200 In
Over voltage during switching operations
No (Transient free)
Yes, up to 2 Un
Time delay for switching
20ms (Typical)
10-50s
Present of mobile electrical contacts
No
Yes
Expected service life of contacts (Switching on/off)
Almost unlimited
Typically 100,000 operations

 
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