Product introduction With the rapid development and wide application of the microelectronic technology, digital control technology and communication and network technology, the intelligent electrical apparatus have been highly improved, the trend of which is intelligence, integration, network, high reliability, usability, maintainability, energy efficiency, environmental protection and security. WSK(K) intelligent integrated power capacitor is an entirely new generation of low-voltage reactive compensation device developed on the basis of the general development planning for the intelligent electrical apparatus, which has pass the test performed by National Inspection and Test Center for Reactive Compensation Devices of Electric Power, and it can reduce the line loss and improve the power factor and power quality of 0.4kV low-voltage distribution network. The capacitor consists of intelligent measurement and control unit(s), zero-crossing switching circuit, line protective unit(s) and low-voltage power capacitor(s). It adopts the upper-and-lower split type modular structure, and the upper part consists of intelligent measurement and control unit(s), switch unit(s) and protective unit(s), while the lower part consists of two ( △ type) or one (Y type) low-voltage power capacitor. There is three-phase compensation and single-phase compensation, thus the product can be used alone or in the compensation system consisting of more products. As a result, the automatic local, single-phase and three-phase compensation can be achieved conveniently and the mixed compensation requirements for three-phase unbalance are satisfied.
The product adopts zero-crossing switching technology, modern measurement and control technology, network communication technology and automation control technology, thus changing the outdated switching technology of the mechanical contactor or the mechanical-electrical integrated switch as a switching capacitor in the traditional reactive compensation device, and changing the large and heavy structure mode of the traditional reactive compensation device. The new generation of low-voltage reactive compensation device has better compensation effect, smaller size, lower power consumption, lower cost, more flexible operation, more convenient maintenance, longer life and higher reliability, all of which meet the higher requirements of the modern intelligent power grid for reactive compensation.
Compared with traditional products, the intelligent capacitors have the following excellent performances: Zero-crossing switching: It adopts the intelligent zero-crossing switching circuit, which means that it's on when the voltage is equal and it's off when the current is zero, and the switching causes no inrush transient current, no operating over-voltage and no arc restriking. Therefore, the withstand voltage of the equipment is increased greatly, while the current impact and power consumption are reduced, then the energy consumption inside the cabinet of a normal capacitor is reduced by 80%. Singe-phase compensation: The single-phase compensation realized resolves the problem of three-phase load imbalance. The phase with a larger active power lack is compensated individually and the best compensation effect is obtained. Energy saving and consumption reduction: The size is reduced by about 50%, which can save the resources like land, copper, silver and engineering plastics by about 50% and reduce the electrical loss of wires, contacts and components by about 50%. Temperature protection: It's equipped with a temperature sensor, which can realize over temperature protection in case of the internal heating inside the capacitor caused by over-current, over-harmonic, excessive leakage current and excessive ambient temperature. The capacitor will switch off automatically and exit running when the temperature exceeds the set value, therefore, it realizes protection to the device. Intelligent network: When some intelligent integrated power capacitors work together, they generate a network automatically. Among them, the one with the smallest address code works as a host and the others work as slaves, producing a low-voltage reactive automatic control system; if one individual slave breaks down, it will quit automatically without affecting the operation of the others, while if the host breaks down, it also quits and then a new host emerges from the slaves and also a new system forms; the capacitors with the same capacitance are switched according to the cyclic switching principle while those with different capacitance are switched according to the appropriate compensation principle; 485 communication interface, which can be connected with the background computer for comprehensive power distribution management. High reliability: The decentralized control mode is adopted instead of the controller to avoid the whole system breaking down due to the failure of the controller. The intelligent zero-crossing switching guarantees no inrush current impact, no operating over-voltage, no arc re-striking and extreme-low failure rate during the switching process, and resolves the problem in the traditional mode that the contactors and capacitors are usually damaged. Building block structure: Standard and modular products replace traditional controllers, air switches, AC contactors, controlled silicon, thermal relays and capacitors, which are combined as a whole. The cabinet installation adopts the building block stacking mode. Convenient connection: As for the installation of some capacitor cabinets, the working time is reduced by over 60% compared with that in the traditional mode, while the connecting wires are reduced by 80% and the joints are reduced by 80%. Therefore, the cabinet is compact inside and quick field assembly is realized. Convenient expansion: The product is small in size and easy to connect. The number of capacitors can be increased when necessary due to the increase of the electrical load. That changes the inflexible limitation of troublesome connection in the normal mode and meets the requirements of enterprise development. Staged investment is available. Easy maintenance: The simple man-machine interface shows the protective actions as follows: over-voltage, under-voltage, over-current, over temperature and three-phase unbalance; the intelligent integrated power capacitor has the function of self-diagnosis, and can indicate in the display screen the failure information about electronic switches, capacitors, air switches and network communication of the intelligent module. This function is useful for field failure search. Remarkable results: It guarantees the steady system voltage, improves the power factor and predicts the capacitors in operation. If over-compensation happens to the capacitors in operation, the capacitors will not be put into operation to avoid penalty due to excessive reactive power; it can improve the active power of the distribution transformer, reduce the capacitance expansion investment and reduce the loss and energy consumption.
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