High Voltage Parallel Capacitor Complete Set

High Voltage Parallel Capacitor Complete Set is suitable for industrial frequency three-phase AC power systems, aiming to improve power factor, enhance grid voltage quality, reduce line losses, increase transmission line power delivery capacity, and fully exploit the economic benefits of power transmission and transformation equipment. The device features complete set standardization, compact structure, convenient installation and maintenance, reliable operation, and low cost, making it particularly suitable for centralized compensation in substations, as well as the construction of urban and rural power grids.

Structure and Features

The device consists of multiple capacitor unit products, forming a complete set, which is a commonly used structure. This structure can be further categorized into single-layer and multi-layer, single-row and double-row forms. The specific selection depends on factors such as device capacity, number of capacitor units, installation site size, and bus layout requirements, without a fixed pattern.
The device mainly includes isolation (grounding) switches, shunt capacitors and their brackets, series reactors, zinc oxide surge arresters, discharge counters, fuses for individual capacitor protection, discharge coils, busbars, support insulators, connection lines, etc. It can be divided into indoor cabinet type and outdoor framework type according to different installation locations. The indoor cabinet-type device is made of high-quality cold-rolled thin steel plate, processed by CNC machine tools, and treated with spray plastic on the surface. The outdoor framework-type device consists of hot-dip galvanized frames, capacitor assemblies, etc., with immersion-plated or stainless steel safety mesh barriers and mesh doors around the device. The main accessories of the device include:
(1) Shunt capacitors: The core of the device, providing reactive power, with other components configured to ensure its safe and effective compensation function.
(2) Circuit breakers: Used for normal operation switching and fault isolation. The device is equipped with electrical and mechanical interlocks to meet the "five-prevention" interlocking requirements with circuit breakers.
(3) Series reactors: Used in the capacitor circuit to suppress high-order harmonics, reduce closing surge current, minimize harmonic damage to capacitors, and improve voltage waveform.
(4) Zinc oxide surge arresters: Connected in series in the line to limit operating overvoltages caused by capacitor group switching and protect capacitors from other overvoltages.
(5) Discharge devices: Discharge coils are directly connected to both ends of the capacitors to reduce the residual voltage of the capacitor group to 50V or lower within a specified time after disconnecting the power supply.
(6) Fuses: Connected in series with each capacitor, fuses reliably disconnect faulty capacitors when internal faults occur, preventing further development of faults, and providing clear fault point markings.
(7) Isolation or grounding interlock knife switches: When the capacitor group is combined, the line is energized; after the capacitor group is disconnected, the isolation knife switch opens and the grounding knife switch closes, ensuring reliable grounding of the device to ensure personal safety.
(8) Protection devices: Installed to prevent abnormal system conditions from affecting capacitors and to timely disconnect faulty capacitors to prevent the situation from escalating.
(9) Operation control devices: Able to quickly and accurately detect and process various operating parameters of the capacitor group, and implement adjustment and control as needed (i.e., set values) to ensure the capacitor group operates.
(10) Other components: In addition to the main components mentioned above, depending on project requirements, additional parts such as cabinets (frames), pillar insulators, connecting cables, busbars, copper-aluminum transition plates, metal fences, bolts and nuts, clamps, fittings, terminal blocks, and insulation covers to prevent small animal hazards may be included.