TBB High voltage parallel capacitor deviceDetailed product description：

The TBB high-voltage parallel capacitor device (hereinafter referred to as the device) is mainly used in power frequency 6KV, 10KV, and 35KV three-phase AC power systems to improve power factor, adjust network voltage, and reduce line losses.

Environmental requirements for use
1. The altitude of the installation and operation area shall not exceed 1000M.
2. The ambient temperature in the installation and operation area shall not exceed -5 ℃~+40 ℃ for indoor devices and -30 ℃~+40 ℃ for outdoor devices.
3. The installation and operation area should have no severe mechanical vibration, no harmful gases and vapors, and no conductive or explosive dust.

structure
Structure of 6KV and 10KV devices
1.1 6KV and 10KV devices consist of high-voltage switchgear (including high-voltage circuit breakers, high-voltage isolating switches, current transformers, relay protection, measuring and indicating instruments), series reactors, discharge coils, zinc oxide lightning arresters, grounding isolating switches, fuses for single capacitor protection, parallel capacitors, connecting busbars, and steel frames. The dual star connector also includes a current transformer for neutral unbalanced current protection.
1.2 6KV and 10KV high voltage switchgear are installed in the switch room, and the arrangement of capacitor banks and series reactors is divided into three types: fence type, cabinet type, and collective type.
A fence style
The fence style structure surrounds the capacitor group and series connected reactors with steel mesh guardrails, with maintenance channels between the steel mesh guardrails and maintenance channels outside the steel mesh guardrails. The steel mesh guardrail is equipped with series reactors (oil immersed iron core reactors for indoor devices are placed in a dedicated reactor room), grounding isolation switches, zinc oxide lightning arresters, and capacitor banks. The capacitor bank includes: parallel capacitors, fuses for single capacitor protection, discharge coils, connecting busbars, and steel frames. Double star connectors also have current transformers for neutral unbalanced current protection.
B cabinet type
The cabinet structure is to install all equipment except for the series reactor on a steel frame similar to a cabinet, and the cabinet door is made of steel mesh or galvanized welded mesh. The entire structure is divided into two parts: series reactors and capacitor banks. The capacitor bank includes an inlet frame and a capacitor structure. The series reactor is enclosed by a steel mesh fence (the oil immersed iron core reactor installed indoors is placed in a dedicated reactor room), and the incoming frame is equipped with a discharge coil, grounding isolation switch, zinc oxide lightning arrester, and a current transformer for unbalanced current protection of the neutral line. The capacitor architecture includes parallel capacitors, fuses for single capacitor protection, and connecting busbars.
C set type
Ensemble is a way of forming a capacitor bank consisting of parallel capacitors in an ensemble. The modular structure includes series reactors, modular parallel capacitors, and discharge coils. All live parts are at a height of 3M above the ground, and there is no need to install steel mesh guardrails. Collective parallel capacitors are mainly composed of cores, sleeves, oil tanks, oil storage tanks, moisture absorbers, pressure release devices, gas relays, oil temperature measurement devices, and chip radiators. The three-phase collective parallel capacitor is of type III wiring, with two lead bushings for each phase. Single phase collective parallel capacitors can have three lead bushings to achieve voltage differential protection.
35KV device structure
2.1 The 35KV device consists of a high-voltage switchgear (including high-voltage circuit breakers, current transformers, relay protection, measurement and indication parts), series reactors, discharge coils, zinc oxide lightning arresters, fuses for single capacitor protection, parallel capacitors, connecting busbars, and steel frames. Double star connectors also have current transformers for neutral unbalanced current protection. The device is a fence like structure.
2.2 Each phase is a single star shaped wiring device with a double series section, and the capacitor groups are arranged in phases. Each phase is insulated from the ground, and the capacitor groups of each phase have a layer two row or layer two row structure.
2.3 Each phase is a single star shaped wiring device with four series sections. The capacitor groups are arranged in phases, with each phase insulated from the ground. The capacitor groups for each phase are a two-layer, two row structure.
2.4 Each phase is a double star shaped wiring device with a double series section. The capacitor groups are arranged in phases, and each phase is insulated from the ground. The capacitor groups for each phase are a two-layer, two row structure.
2.5 500KV Substation 35KV Device Example
a. The TBB35-25200/300-BLW device is installed and operated at the 500KV substation in Fangshan, Beijing. It has a double star connection, three-phase stacked capacitor banks, and is insulated from the ground. Two rows of capacitors are arranged horizontally for each phase.
b. The TBB35-40000/334-BLW device is installed and operated at the 500KV substation in Zengcheng, Guangdong. It has a double star connection, with capacitor components arranged in separate phases and each phase insulated from the ground. Each phase capacitor group is arranged in two layers and two rows, with interlayer insulation.
2.3 Wiring of series reactors
Dry type hollow core reactors are connected in series before the capacitor bank, that is, on the power supply side of the device; The oil immersed iron core reactor is connected in series after the capacitor bank, that is, on the neutral point side of the device.

TBB high-voltage parallel capacitor device model meaning DeviceTypeMeaning
Note 1: (First footnote number) A represents Y wiring, and B represents Y-Y wiring.
Note 2: (Second suffix) K represents open delta voltage protection, C represents voltage differential protection, and L represents neutral unbalanced current protection.
Note 3: (Third footnote number) W represents outdoor equipment, if not marked, it is indoor.
For example: TBB10-4800/100-AK
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 parallel capacitor device with Y wiring and open delta voltage protection.

Main technical performance and data of TBB high-voltage parallel capacitor device

The device can operate for a long time under a steady-state overvoltage of 1.1 times the rated voltage.
2. The device can operate continuously under overcurrent with a root mean square value not exceeding 1.3 times the rated current of the capacitor bank, which is the result of the combined action of harmonics and overvoltage up to 1.1 times the rated voltage.
When operating under overvoltage and overcurrent within the limits specified in Articles 3.2 and 3.3, the total capacity of the device should not exceed 1.35 times the rated capacity.
The difference between the measured capacitance of the capacitor bank and its rated capacitance is within the range of 0~+10%. When the capacitance deviation is+10%, the overcurrent in section 3.3 above may reach 1.43 times.
5. The overcurrent generated by the overvoltage caused by the addition of harmonics to the power frequency during the operation of the device shall not exceed the value specified in Article 3.3. When the device operates for a long time at a voltage not exceeding 1.1 times the rated voltage, the peak voltage including all harmonic components cannot exceed 1.22 times the rated voltage.
6. The device shall be equipped with high-voltage circuit breakers without heavy impact and zinc oxide lightning arresters to limit the operating overvoltage generated during the switching of capacitor banks. SN10-10 low oil circuit breaker is selected for 6KV and 10KV devices for situations that do not require frequent switching, and ZN5-10 III vacuum circuit breaker is selected for situations that require frequent switching. Select ZN-35 vacuum circuit breaker or LW8-35, LN-35 sulfur hexafluoride circuit breaker for 35KV.
7. The device is equipped with CKG type dry-type hollow core reactor connected to the power supply side or CKS type oil immersed iron core reactor connected to the neutral point side, in order 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 inrush current during closing. Reactors with a rated reactance rate of 5-6% are used to suppress harmonics of the 5th order and above, as well as to limit inrush current during closing. The rated reactance rate of 12-13% is used to suppress harmonics of the 3rd order and above, and to limit the inrush current during closing.
8. The use of FD type discharge coils in the device can reduce the residual voltage of the capacitor bank from the peak rated voltage to below 0.1 times the rated voltage within 5 seconds.
According to the needs of the system and users, the device can be controlled locally or centrally in the main control room.
10. The device adopts a single capacitor fuse protection as the main protection, and open delta voltage, voltage differential, and neutral unbalanced current protection as backup protection. In addition, the device is also equipped with overcurrent, quick break, overvoltage, and undervoltage protection.