TBB high voltage shunt capacitor device Model description TBB10-1200/50-A(B)K(C,L)(W) TBB: Shunt capacitor bank/ Shunt capacitor device 10: Rated voltage(kV) 1200: Rated capacity (kVar) 50: One capacitor capacity(kVar) A(B): Wiring method A: Y type wiring B: Y-Y type wiring K(C,L): Protection K: Open delta voltage protection C: Voltage differential protection L: Neutral line unbalanced current protection (W): Outdoor, Not mark: Indoor

Features

1.The device can run for a long time under a steady-state overvoltage of 1.1 times the rated voltage.

2.The device can run continuously under over current with root mean square value not exceeding 1.3 times the rated current of the capacitor bank.

3.The device uses a high-voltage non re-strike circuit breaker, and it is equipped with a zinc oxide lightning arrester to limit the operating overvoltage generated when switching capacitor banks.

4.6kV and 10kV devices use vacuum load switches, vacuum circuit breakers or SF6 circuit breakers as switching switches for capacitor banks. For capacitor bank with small capacitance and group switching, vacuum contactors should be used, vacuum circuit breakers or SF6 switches should be used for capacitor bank with large capacitance.
5.The device adopts dry-type air-core reactor connected to the power supply side of the device or dry-type iron core reactor connected to the neutral point side of the device to limit the closing inrush current, suppress higher harmonics, and improve the network voltage waveform. Reactors with a rated reactance of 0.5-1% are used to limit closing inrush current, reactors with a rated reactance of 5% to 6% are used to suppress 5th and above harmonics and limit closing inrush current. Those with a rated reactance of 12 to 13% are used to suppress 3rd and above harmonics and limit closing inrush current.

6.The device uses FD type discharge coils, which can reduce the residual voltage of the capacitor bank from the peak value of the rated voltage to less than 0.1 times the rated voltage within 5s.

7.According to the needs of the system and users, the device can adopt local control or main control room, centralized control, or automatic control.

8.The device uses single capacitor fuse protection as the main protection, opening triangle voltage, voltage differential, and neutral line unbalanced current protection as backup protection. In addition, the device also has over current, overvoltage, and voltage loss protection. These protections can also be realized by using a better-performance microcomputer capacitor protection monitoring device to achieve the requirements for capacitor relay protection.

Main usage and application

The high-voltage shunt capacitor complete device (hereinafter referred to as the device) is mainly used in three-phase power systems with power frequencies of 6kV, 10kV, and 35kV. It is used to adjust and balance the voltage of the substation network, improve the power factor, reduce losses, and improve power supply quality.

Environmental conditions of use

1.Altitude: not higher than 1000m.

2.Ambient temperature: -25 ¡æ~+ 55 ¡æ.

3.Relative humidity: not more than 85%.

4.No explosive medium is allowed in the operating place. The surrounding medium should not contain corrosive and destruction-insulating gas and conductive medium.

Structure

1.6 ~ 10kV device consists of high-voltage switchgear (including circuit breakers, high-voltage isolating switches, current transformers, relay protection, and measuring instruments), series reactors, discharge coils, zinc oxide arresters, grounding switches, and single capacitor protection fuse, shunt capacitor, connection bus and steel frame. The double star connection includes a current transformer for neutral line unbalanced current protection.

2.6 ~ 10kV device high voltage switchgear is installed in the switch room. The arrangement of capacitor banks and series reactors is divided into three types: indoor cabinet type, frame type and collective type:

2.1Indoor cabinet type

The capacitor bank is composed of one inlet cabinet and several capacitor cabinets according to different capacity specifications. The inlet cabinet is equipped with discharge coil, grounding switch and zinc oxide arrester. The capacitor cabinet includes shunt capacitors, fuses for protection of single capacitor, and a transparent observation window on the door panel.

2.2Frame type

The capacitor bank includes inlet frame and capacitor frame. The entire device structure is divided into several modules and then assembled on site. The inlet frame is equipped with discharge coil, grounding switch, and zinc oxide lightning arrester. The double star connection also has current transformer for neutral line unbalanced current protection. The capacitor structure includes shunt 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.

2.3Collective/Integrated type

The collective type is capacitor bank composed of collective shunt capacitors. Collective structure includes series reactors, collective shunt capacitors and discharge coils. The 35kV device consists 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 protection fuses, and shunt capacitors. The double star wiring also has current transformer for neutral line unbalanced current protection, and the devices are all frame structures. For the connection of series reactors, the air-core reactor is installed before the capacitor bank, that is, the power supply side, and the iron-core reactor is installed after the capacitor, that is, the neutral point side of the device.

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