1、Overview

The reactive compensation articulated on the electrified wire netting achieves compensation effect mainly through automatic input and cut off electric power capacitor, therefore, the control of the capacitor switching components performance plays a key role to the w hole de vice qu ality a nd sta bility. T raditional reactive compensation device adopts electromagnetic contactor as control of division and contact. Due to the limited pe rformance o f c ontactor, a nd th e s afety discharge time reqirement of contactor itself, it is unable to meet modern technology rapidly changing rate of load.

CLKT uses the modern technology crystallization, have a quick threw cutting in the ability of the thyrister, tie-in advanced zero investment, CLKT precise control unit cast in the role of capacitor module cut, it can offer users a satisfactory real-time reactive compensation performance, and is the optimum scheme to improve power factor of power system load and harmonic treatment. In actual application of reactive power compensation, controllable silicon switch module can be used in TSC low-pressure reactive compensation to replace contactor. This way, you can input electric capacity when switching voltage over zero, thus avoid impulse current emerge and moment fluctuations of electrified wire netting and voltage.

CLKT t hyristor switches op erate without noise or mechanical loss, and has in fact no transient process advantages. Control signal can be transferred directly from the load to the capacitor set, and has the smallest delay to improve the power factor. In the fast load, using thyristor fast switch, in order to achieve real-time dynamic quick threw cutting for the load, improve power
factor, decrease network loss, inhibit voltage fluctuation, improve power quality with no surge and no transient current, prolong service life and protect system of capacitor re liable sa fety o peration, th e th yristor controlled system makes all segment of the capacitor set the shortest time for investing or resection only a cycle.

2、Technical characteristics

CLKT thyristor electronic non-contact switch not only have vantage like small zero shots gush and no cutting overvoltage.etc, but also can solve the heat dissipation problems at work. It has no mechanical wear, or no noise while operating. In practical work, Its operating life is virtually unlimited, can cast cut frequently, and the cast cut moment can be accurately controled. Therefore, it can achieve smooth input and resection without transition process, and the dynamic response time is only 1 ~ 20ms, so it can cope with great changed load such as cranes, elevator, rolling mills and welding torch, and carry on quick power factor compensation, also reduse maintenance and replacement workload brought from the contactor e asy w ear. Thus it is the 
ideal switch for capacitance threw cutting.

Characteristics

● Zero dynamic threw cutting， Response speed 1 ～ 20ms
● thermal protection internally installed
● Integrated integration, small volume, convenient installation
● Whole casting structure, strong and durable
● Cooling system internally installed, automatic control start-stop
● Service life over 15 years
● Suitable for all kinds of cabinet installation

Advantage: energy-efficient， Power optimization，Equipments processing precision optimization， Safe and reliable operation.

(1)Fastly track compensate load reactive current, and keep the best state at any time.
(2)Reduces transmission and transformer loss, and realize real-time reactive power balance.
(3)Filter harmonicsand and improv the voltage waveform distortion.
(4)Ascending power operation level and effectively avoid the high voltage phenomenon caused by surplus reactive when load of charged wire netting lows.
(5)Improve the current shock caused by l oad shock, and effectively suppress voltage fluctuation and voltage flicker.
(6)Improve machining precision and welding quality.
(7)Improve the motor starting performance, and shorten the starting time.
(8)Reduce the load current in the substation transformer and distribution lines , and increase carrying rate.

(9)Without close brake eddy currents, no spark andnoiseless.
(10)Available for long-term and stable operation in fast frequency wave, and the equ ipment can be in normal operation without personnel handling.

3、The comparison between thyristor threw cutting switch and traditional contactor switch.

1）Contactor switch module

The Ac contactor has powerful generality and lower price , but it can produce big surge and pulse
overvoltage when used in capacitor, and sometimes can lead to insulation breakdown or contactor contactor caustic, so it’s easy to cause the contactor damage,thus affect  the use of 
compensation device .

Capacitance threw cutting special contactor is mounted current limiting impedance device on the ordinary accontactor main contactor. Such improvements can play a role when capacitor is in less frequent, but its effect ofinhibiting capacitor inrush current is not ideal. When the current is heavy, its current limiting resistor and main contactor can be often burned as well, especially in case of great reactive load fluctuation and frequency capacitor switching, the actual service life is often only about one year. Therefore, this special contactor only applies to ideal working conditions like smooth load basic and three-phase voltages basically balanced.

2） Thyristor switch module

Methven silicon controlled switch makes full use of the voltage zero trigger, current zero excision, switch non-contact, h igh re sponse spe ed … etc th yristor characteristics, therefore it can make t he cap acitor voltage rise from zero to the rated voltage rapidly. And when the disconnect, the silicon controlled current on the ze ro i s re sected, so i t c an re alize fa st dyn amic compensation function of capacitor input without inrush current, e xcision w ithout o vervoltage, a nd c ast cut without arc. So it can be better to solve the transient problem produced while capacitor threw cutting.

3）The comparison between thyristor threw cutting switch of reactive compensation devices and traditional contactor

CLKD thyristor threw cutting switch	traditional contactor threw cutting switch
Switch without inrush current —— Electronic switch threw cutting prevent inrush current  and over zero input brought from capacitor  compensation of traditional contactor threw cutting	inrush current——compensation of contactor threw cutting cause great inrush current and voltage
Solid switch, non-contact	Mechanical contacts suit
No spark	Spark existed
completely compensation for changing load , shocking load and flickering load	No compensation for changing load , shocking load and flickering load
Of low environmental requirements , strong ability to dust, and strong moisture resistance	Of high environmental requirements, be afraid of dust and damp, plateau unadaptable
High security reliability, and won't cause fire explosion	Low security reliability，and can burst into flames accidents easily
No over-voltage, over-current,or pollution power	Existing over-voltage, over-current,or pollution power
non-contact,no contacts sintering，and with service life over 15 years	Contacts easy sintering, short service life within 1-3 years
1~20ms High-speed compensation performance, and short action time，1~20ms	Compensation slow, and long action time
With the ability of compensation with different phrase, and unbalanced three-phase elimination	Not be able to compensate with different phrase
Small ripple after compensation, voltage stability, and power factor close to 1	Shaky after compensation, voltage instability,generally can't compensate to nearly 1 power factor
When repeat threw cutting don’t need to discharge, and reactive always controlled	Takes several minutes to discharge again after capacitor resection, and during this period the compensation doesn't work, reactive spin out of control
Cut away without transient current	Existed

 

4） Technical parameters

Components : Thyristor module , Precisionfast intelligent controller, Explosion-proof capacitor, Filter reactor.

Rated voltage: 230V-690V,50/60Hz

Protect grade: IP20

Rated power: 5kvar-100kvar, can choose to pick up

circuit reactance with 14% t reactance rate

Temperature range: -40℃~55℃

Overload ability: 1.5 times In below 60s.

Elevation: <4000M

Wet degrees: below 95% relative humidity

Use place: Any place, dustproof moistureproof

Thestandard basedon :IEC60831-1+2,IEC146,VDE05550/0532, IEC60439，IEC146 Security features: Dry technology, whole pouring structure, system integration

Single grade maximum capacity: 60kvar.

4、CLKT thyristor threw cutting switch equipment type table

■230V-690V

Model	System voltage	Output power	Alarm output	Aplication
CLKT25	480	25Kvar	Exist	Real-timedynamic threw cutting
CLKT30	480	30Kvar	Exist	Real-timedynamic threw cutting
CLKT50	480	50Kvar	Exist	Real-timedynamic threw cutting
CLKT60	480	60Kvar	Exist	Real-timedynamic threw cutting