TBBWZ Automatic reactive power compensation device for high voltage line

Main purpose and scope of application
TBBWZ series high-voltage line reactive power automatic compensation device is suitable for 6-10kV transmission lines and installed on outdoor poles. It is used to improve power factor, reduce line loss, and improve voltage quality.
This product complies with: National Standard GB/T30841-2014 (our company is the main drafting unit of this standard).

Model and meaning

For example, TBBWZ10-400 (100G+100+200) means that the compensation capacity is 400kvar, the fixed compensation capacity is 100kvar, and the two groups are automatically switched (1 group 100kvar, 1 group 200kvar).

Working conditions
1. Installation method: outdoor installation on a pole;
2. Ambient temperature: -40℃~+50℃;
3. Altitude: ≤1000m;
4. Wind speed: 35m/s;
5. No corrosive gas or steam around , No conductive or explosive dust;
 
Main technical parameters
1. Rated voltage: 6-10kV;
2. Rated frequency: 50Hz;
3. Compensation capacity: 30-900kvar;
4. Secondary control voltage: AC220V;
5. Main circuit engineering Frequency withstand voltage: 42kV/min;
6. Auxiliary circuit withstand voltage: 2.5kV/min;
7. Lightning impulse withstand voltage: 75kV;
8. Service life: more than 300,000 times.

Product features
1. Capacitors have built-in fuses and discharge resistors, which will self-discharge after power failure to ensure safe operation;
2. Capacitors can be built-in or external, and the capacity is best configured according to 1, 2 to achieve three-level switching;
3. Available Automatic switchingaccording to voltage, power factor, reactive current, etc.;
4. With protection functions for over voltage, under voltage, over current, and phase loss;
5. The device can be switched on and off automatically or manually, which is convenient for users to debug And operation. It adopts high-voltage vacuum contactor to switch on and off capacitors, which can be switched on and off frequently. It has the characteristics of long life, safety and reliability, and maintenance-free;
6. It adopts advanced level of intelligent reactive power compensation controller as the control core, which can display various parameters of the circuit. Such as current, voltage, active power, reactive power, power factor, current and voltage distortion rate, harmonic content rate, etc. And save daily punctuality data and daily statistical data for more than 200 days, up to 800 days. The controller has the functions of "four remotes" (remote measurement, remote control, remote adjustment, and remote signaling);
7. Using on-site and remote communication, it can realize real-time and regular call of various power parameters, modify control parameters, and remotely switch capacitors. The short-distance (30-50m) wireless communication can realize the on-site meter reading of handheld computer data;
8. The minimum capacity of each group of capacitor configuration is 50kvar and the maximum capacity is 900kvar. The configuration can be a fixed group, a group of automatic switching or two groups of automatic switching cut.

Structural features
1. Drop-out fuse. As a short-circuit protection and also as an isolating switch, the upper end is connected to the high-voltage line, and the lower end is connected to the lightning arrester and the box;
2. The lightning arrester is used to absorb the operating overvoltage;
3. The sealed switch box, the top is the inlet casing, the box There are voltage transformers (used for vacuum switch operation power supply and voltage protection), current transformers, and vacuum contactors in the body. Other controllers, indicator lights, etc. are installed in the control box, which is isolated from the high-voltage part;
4. The capacitor is externally mounted, with outlet sleeves on the side of the box body, and the capacitors are distributed on the side of the box body and are connected to the outlet sleeves respectively. on. The top of the box is a rain cover, and there is a hoisting ring for hoisting. The switch box is installed on the platform between the two poles, and the control box is fixed on the pole;
5. Current transformer for sampling, in the line A Special outdoor open-type current transformer for phase installation.

Selection of compensation capacity and method
1. If the power factor before line compensation is COSф1, after compensation, it is COSф2, and the line active power is P.If P is the active power of the line's constant load, COSф2 can be selected higher. If P is the line For the maximum active power, COSф2 can be selected lower.
2. In order to reduce costs, a set of fixed compensation should be installed on the line, the capacity of which is determined by the capacity of the distribution transformer on the line. The selection principle is that the no-load capacity of the power distribution is not greater than about 5-10% of the distribution transformer. Small capacity distribution transformers on the line and larger total capacity can be selected, so that the choice will not over-compensate even if there is no load on the line. If the difference between the maximum load on the line and the regular load is not too large, you can choose a fixed group for automatic switching. If the difference between the two is large, select two groups for automatic switching according to 1, 2, which can generally meet the compensation requirements. . Fixed compensation can also be installed separately, which includes drop-out fuses, arresters and capacitors, and should generally be installed behind the line load center.
3. The installation location should be selected as follows: if reactive power control is used, it should be installed at the head end of the line, and more than 70% of the load current should flow through the sampling current transformer. If it is voltage control. Should be installed at the end of the line; generally 2/3 to 3/4 away from the beginning of the line. No matter what kind of control, it should be as close as possible to the load center of the line to avoid the increase of line loss due to long-distance transmission of reactive power. Voltage control is often used where the voltage at the end of the line is low. If the voltage is particularly low, it uses an over-compensation method to increase the voltage. In this case, it is generally not necessary to install expensive sampling current transformers.