Complete set of high voltage shunt capacitor

Main purpose and scope of application The
high-voltage shunt capacitor complete set (hereinafter referred to as the device) is mainly used in the three-phase power system of 6kV, 10kV, and 35kV at the power frequency to adjust and balance the voltage of the substation network, improve the power factor, and reduce the loss. Improve the quality of power supply.
This product complies with: National Standard GB/T30841-2014 (our company is the main drafting unit of this standard).

Model and meaning

Note 1: A means Y wiring, B means YY wiring.
Note 2: K stands for open delta voltage protection, C stands for voltage differential protection, and L stands for neutral line unbalanced current protection.
Note 3: W means outdoor installation, if not marked, it means indoor. For example: TBB10-4800/100-AK
means that the rated voltage of the device is 10kV, the rated capacity of the device is 4800kvar, and the capacity of a single capacitor is 100kvar. It is an indoor shunt capacitor device with Y wiring and open delta voltage protection.

Working conditions
1. Altitude: ≤1000m;
2. Ambient temperature: -25~+55℃;
3. Relative humidity: ≤85%;
4. No explosive dangerous medium is allowed in the operating place, and no surrounding medium should be mixed Corrosive and insulating gas and conductive medium.

Product features
1. The device can operate for a long time under a steady-state overvoltage of 1.1 times the rated voltage;
2. The device can continuously operate under an overcurrent whose root mean square value does not exceed 1.3 times the rated current of the capacitor bank;
3. The device adopts no heavy breakdown The high-voltage circuit breaker is equipped with zinc oxide arrester to limit the operating overvoltage generated when switching the capacitor bank;
4, 6kV, 10kV devices use vacuum load switches, vacuum circuit breakers or SF6 type circuit breakers for the capacitor bank switching Cut the switch. For small-capacity capacitor banks that need to be switched in groups, vacuum contactors should be used. For large-capacity capacitor banks, vacuum circuit breakers or SF6 switches should be used;
5. The device uses dry-type air-core reactors to connect to the power supply side of the device or The dry-type iron core reactor is connected to the neutral point side of the device to limit the closing inrush current, suppress high-order harmonics, and improve the network voltage waveform. A reactor with a rated reactance rate of 0.5-1% is used to limit the closing inrush current; a reactor with a rated reactance rate of 5 to 6% is used to suppress the 5th and above harmonics and limit the closing inrush current. The rated reactance rate of 12~13% is used to suppress the 3rd and above harmonics and limit the closing inrush current;
6. The device adopts FD type discharge coil, which can reduce the residual voltage of the capacitor bank from the rated voltage peak to 0.1 within 5s Below the rated voltage;
7. According to the needs of the system and users, the device can adopt local control or the main control room, centralized control or automatic control, etc.;
8. The device adopts a single capacitor fuse protection as the main protection, open delta voltage, Voltage differential and unbalanced current protection are used as backup protection. In addition, the device is also equipped with over-current, over-voltage, and loss-of-voltage protection. The realization of these protections can also choose a better performance microcomputer capacitor protection monitoring device to achieve the requirements for capacitor relay protection.

Structural features
1. The 6-10kV device consists of high-voltage switchgear (including circuit breakers, high-voltage isolation switches, current transformers, relay protection, measuring instruments), series reactors, discharge coils, zinc oxide arresters, grounding switches, and a single capacitor It is composed of fuse, shunt capacitor, connecting bus and steel frame for protection. The double star type also includes current transformers for neutral line unbalanced current protection.
2. The 6-10kV device high-voltage switch cabinet is installed in the switch room, and the arrangement of the capacitor bank and series reactor and other equipment is divided into three types: indoor cabinet type, frame type, and assembly type.
(a) Indoor cabinet type The
capacitor bank is composed of one incoming cabinet and several capacitor cabinets according to different capacity specifications. A discharge coil, a grounding switch and a zinc oxide lightning arrester are installed in the incoming cabinet. The capacitor cabinet includes shunt capacitors, a fuse for single capacitor protection, and a transparent observation window on the door panel.
(b) Frame type
Capacitor bank includes incoming wire rack and capacitor frame. The entire device structure is divided into several sections, and then assembled on site. A discharge coil, a grounding switch, and a zinc oxide lightning arrester are installed in the wire inlet frame. There are also current transformers for neutral line unbalanced current protection for double-star connections. The capacitor structure includes parallel capacitors and fuses for single capacitor protection. A steel mesh fence can be set outside the frame or a steel mesh door can be set on the frame.
(c) Collective type
Collective type is a method of capacitor bank composed of collective parallel capacitors. The collective structure includes series reactors, collective parallel capacitors and discharge coils.
3. The 35kV device is composed of high-voltage switchgear (including high-voltage circuit breakers, current transformers, relay protection, measurement and indication parts), series reactors, discharge coils, zinc oxide arresters, single protective fuses, shunt capacitors, etc. . The double star connection also has a current transformer for neutral line unbalanced current protection. The devices are all frame structures.
4. Wiring of series reactor The
hollow reactor is installed before the capacitor bank, that is, the power supply side, and the iron core reactor is installed after the capacitor bank, that is, the neutral point side of the device.

Ordering instructions
1. Determine the required compensation capacity and the capacity of a single capacitor;
2. Device model and corresponding serial number;
3. Structure mode: cabinet type, cabinet type, assembly type;
4. Reactance rate selection;
5. Protection method ;
6. Other requirements.