Low voltage reactive power compensation device

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Technical indicators

           Rated capacity: It is possible to be configured in accordance with users' demands with the single cabinet rated compensation capacity ≤600kvar. In case of an exceeding of this compensation capacity, it shall be advised to adopt the configuration of combination of the main cabinet with auxiliary cabinet.

           Grouping condition: grouping arbitrarily based on users’ actual requirements

           Dynamic overload capacity: Long-time operation under 1.30 In (rated current). Over-current is the interaction result of harmonics and 1.1 Un (rated voltage). Long-time operation under 1.10 Un. Longest operation of 30min under 1.15 Un every 24 hours.

           Power factor: over 0.95 (set between 0.8 and 1)

           Controlled pathway: 24 pathways

           Respond time: ≤20ms

           Reactance rate: 5%, 6%, 7%, 12%, 13%

           Switching delay: set according to users’ requirements

           Protection grade: IP30 (can be designed according to users’ requirements)

           AC sampling voltage: the voltage of System power supply; AC sampling current: 0~5A

           Cabinet Type: GCK, GGD, MNS, etc. (it is possible to be manufactured according to users' requirements)

Technical features

           Instead of manual intervention, the achievement of automatic fling-cut and adjustment in accordance with the grid system reactive power and voltage control requirement makes it possible to compensate the reactive power automatically as well as to increase the system power factor, by which, in case of a sufficient compensation capacity, it will be ensured to retain the system power factor equal to or above 0.95.

           There is an achievement of non-contact electronic switch developed with the technology of thruster with two-way anti-parallel connection, which makes it possible to extend the service life of switches to a great extent.

           There are achievements of zero-triggering fling-cut, shock-free, flow-free and over-voltage, and non-introducing of transient state or harmonics.

           The fast switching makes it possible to complete the fling-cut of capacitor within 20ms.

           There are options of three-phase common compensation, separate phase compensation and mixed compensation.

           With the superior "e-dog software" circuit and fault-tolerant technology, it is made possible to automatically discover the runtime error and thoroughly eliminate the "crash" phenomenon.

           The unique “hardware circuit fault protection circuit” can ensure it will not cause output false operation.

           The controller has good human-computer interface, intelligent judgment, optimal control and quick response, realizes full digitalization, with liquid crystal display, and has the function of network communication, which can check the time, operation mode, fling-cut group as well as the voltage, electric current, power factor, active and reactive power of bus; It can check the fault information;

           The service life of the capacitor is extended.

           Improve static and dynamic stability of power system.

           There is a decrease of the imbalanced voltage and current, which is also an improvement of the voltage quality and stabilization of system voltage as well as restraining of voltage flicker.

           It gives a decrease of grid loss, efficient energy conservation, an improvement of the efficiency of electrical equipment, and an increase of transformer load.

           Complete protection measures (overvoltage, undervoltage, phase loss, over-current and short circuit etc ).

           The series inductance may prevent from harmonic amplifying and absorb part of the harmonic current.

           It is provided with full digital control, real-time detection and calculation of the amount of reactive power.

           There is a dynamic display for quality parameters of system power factor, voltage, current, frequency, active and reactive power and harmonic.

           There are functions of on-line parameter setting and parameters memory.

           The number of ways of fling-cut shall be displayed for indicating the conditions of work.

           Both manual and automatic fling-cuts are available with an easy and flexible operation.

           The RS485 and CAN communication interfaces are able to be connected with computers or other equipments.

           The functions of multiple alarms are available.

           The function of automatic recovery from power-off is available.

Examples of application

For the loading in heavy industries such as automobile, coal, chemistry, shipbuilding and etc.

There are rapid changes of loading in the heavy industries, for example, automobile, coal, chemistry and shipbuilding, hence the voltage fluctuates, the power factor is low, which requires a fast compensation device. Using low voltage GBD serial dynamic reactive power compensation devices makes it possible to have an accelerated and accurate reactive power compensation for the system, which improved the system in power factor, and stabilized the system in voltage.

Regional substation

Within the regional grid, using low voltage GBD serial dynamic reactive power compensation devices makes it possible to have an accelerated and accurate reactive power compensation for the system, which improved the system in power factor, and stabilized the system in voltage.

Box-type substation

Low voltage dynamic reactive power compensation devices make use of cabinet installation, which may facilitate the mounting into the box-transform system, and further make it possible to have a fast and accurate compensation for the system reactive power, so as to improve the system power factor, and stabilize the system voltage.

Power supply system of electrified railway

Electrical locomotives use single-phase alternating current, which may cause a serious non-balance on the three phases of the grid, a low power factor, along with a negative sequence of current. And, low voltage GBD serial dynamic reactive power compensation devices can increase the system power factor through improving the non-balanced three-phase with separate-phrase compensations.

Wind power generation system

Wind speed change causes wind turbine mechanical power changes, which further causes fluctuation of active and reactive. Thus, it leads to power quality decline and power factor decline. Using low voltage GBD serial dynamic reactive power compensation devices makes it possible to have an accelerated and accurate reactive power compensation for the system, which improved the system in power factor, and stabilized the system in voltage.

Avanced testing equipment