BY89H/450-40+250-15 Low voltage integrated reactive power compensation equipment intelligent power Capacitor 35kvar 450V

Model and Meaning

Product Specifications

Product Overview

At present, most reactive power compensations adopt one reactive power compensation controller to control multiple capacitors to complete switching. Although this control structure is simple, if the distribution transformer monitoring and control terminal fails during use, the capacitors will not be able to continue to be used, affecting the normal power supply of the power supply system. At the same time, the existing reactive power compensation boxes also have problems such as complex structure, messy circuit connections, large size, and complex maintenance.Intelligent low-voltage electrical appliances are the foundation for the power system to move towards intelligence. In recent years, with the rapid development and wide application of microcomputer electronics technology, digital control technology, communication and network technology, intelligent electrical appliances at home and abroad have made great progress. Electrical appliances are developing towards integration, modularization and intelligence. Intelligence, integration, networking, reliability, availability, maintainability, energy conservation, environmental protection and safety have become the mainstream of the development of intelligent electrical appliances.

The intelligent low-voltage capacitor is a brand-new generation of low-voltage reactive power compensation device developed on the overall development framework of intelligent electrical appliances. It consists of a measurement and control unit, a thyristor composite switching unit, a protection unit and power capacitors, etc. It has replaced the previous reactive power compensation complete device composed of discrete components such as intelligent controllers, fuses, composite switches or mechanical contactors, thermal relays, low-voltage power capacitors and indicator lights, which were connected by wires inside and on the panel of the cabinet. It has changed the backward controller technology of traditional reactive power compensation devices and the switching technology of backward mechanical contactors or electromechanical integrated switches for switching capacitors, as well as the bulky and heavy structural mode of traditional reactive power compensation devices. Thus, the new generation of low-voltage reactive power compensation equipment has the characteristics of better compensation effect, lower power consumption, smaller volume, more cost savings, more flexible use, more convenient maintenance, longer service life and higher reliability, meeting the higher requirements of modern power grids for reactive power compensation.

Structure of Intelligent Low - Voltage Capacitors

Intelligent low - voltage capacitors provide the power grid with an intelligent electrical appliance that has a small volume and can independently perform reactive power compensation, which can overcome the deficiencies of existing technologies. It includes an intelligent capacitor housing. Inside the housing, a low - voltage molded case circuit breaker, a thyristor composite switch, an intelligent measurement and control unit, and a low - voltage self - healing capacitor are integrated. Moreover, an incoming line terminal and an outgoing line terminal are installed on the housing.

As shown in Figure 1 of the schematic diagram of the intelligent low - voltage capacitor, the comprehensive measurement and control unit is the core of the intelligent low - voltage capacitor. It provides the switching basis for the thyristor composite switch of the intelligent capacitor, issues switching commands, monitors the temperature of the capacitor, monitors the working conditions of the circuit, etc. And it uploads the operating conditions and sampling data of the intelligent low - voltage capacitor to the upper - level transmission equipment through the network bus (RS485) interface, and finally can reach the user's background management system.

picture 1

The functions of intelligent low-voltage capacitors

Compared with the existing traditional reactive power compensation technology, the intelligent low-voltage capacitor itself has the ability to process and execute the collected signals. It can continue to work stably and accurately when the distribution transformer measuring and controlling terminal fails, realizing the automatic reactive power compensation function of the low voltage. When an individual capacitor fails, it will automatically withdraw without affecting the operation of the remaining capacitors.

The input and output terminals of the intelligent low-voltage capacitor are plug-in wiring terminals, which can facilitate line connection and improve the speed of installation and maintenance. The measuring and controlling unit can measure the internal temperature of each capacitor and the three-phase current of each capacitor, thereby realizing over-temperature protection and over-current, phase loss, three-phase imbalance, and leakage current protection for each capacitor. It can also realize a complete self-diagnosis function from the controller, switchgear to the capacitor.

The over-temperature of the capacitor reflects various situations such as over-voltage, over-harmonic, excessive ambient temperature, and its own leakage current of the capacitor. Setting over-temperature protection can effectively extend the service life of the capacitor. The complete self-diagnosis function reduces the user's operation inspection workload and facilitates the user to find and handle equipment faults by themselves. Moreover, it has a zero-switching function, that is, the capacitor is put into operation when the voltage crosses zero and is cut off when the current crosses zero, achieving reliable switching for up to 1 million times.

At the same time, it has the advantages of small size, energy saving, and easy expansion. When economic conditions are restricted, it can be used independently without installing the distribution transformer measuring and controlling terminal. It has good application and promotion value.The compensation device has three-phase co-compensation, single-phase separate compensation, and single/three-phase mixed compensation functions. The co-compensation capacity and separate compensation capacity are not limited by the number of control circuits, and the number of groups can reach up to 40, which can be freely combined. When the voltage is unbalanced, the reactive power compensation complete set of devices can adjust the configuration of the co-compensation capacity and separate compensation capacity. It can also increase or decrease the capacity of the co-compensation or separate compensation capacitors according to the on-site conditions, making it better adapt to the changes in on-site conditions and more effectively improve three-phase imbalance.

Application of Intelligent Low-voltage Capacitors

Intelligent low-voltage capacitors are suitable for reactive power compensation in 0.4 kV low-voltage distribution networks. They can be installed independently beside electrical equipment to achieve automatic on-site reactive power compensation. They can also be installed in American-style distribution transformers, European-style distribution transformers, distribution cabinets, pole-mounted transformers and pre-fabricated buried transformers. Moreover, they can better perform automatic reactive power compensation for some users with small distribution transformer capacities, new villages for power distribution, etc. They feature strong functions, convenient installation and use, and low investment.

Product wiring diagram

Product dimensions