HYTBBT voltage-adjusting and capacity-adjusting high-voltage reactive power compensation device

product description

At present, the power sector attaches great importance to energy saving and loss reduction. Starting from the management of voltage and reactive power, a large amount of money has been invested to develop a lot of voltage and reactive power management software. VQC, on-load tap changer, Reactive power compensation shunt capacitor bank and other equipment, the voltage quality has been effectively improved. However, due to the backwardness of reactive power adjustment methods and problems such as overvoltage, overcurrent, and lifespan in the operation of capacitors, the voltage and reactive power management software cannot play its due role, and cannot always maintain the required indicators for voltage and reactive power. The due economic and technical benefits cannot be achieved, and the potential of the equipment cannot be fully utilized.

Aiming at the backwardness of voltage and reactive power adjustment methods, our company has developed a new type of substation voltage and reactive power automatic adjustment device on the basis of extensively absorbing new technologies at home and abroad. The output capacity is changed by adjusting the voltage at both ends of the capacitor, which solves the problems of overvoltage and inrush current in the operation of the capacitor, and changes the hysteresis adjustment to real-time adjustment. The substation voltage and reactive power automatic adjustment device can also transform the fixed parallel capacitor into an adjustable inductive reactive power compensation device. The popularization and application of this equipment can effectively improve the management level of voltage and reactive power, which can greatly reduce the power grid line loss, improve the power quality, improve the safe operation level of equipment, increase the economic benefits of power supply enterprises, and improve the power supply capacity without building new power plants. Contribute to solving the current domestic power shortage situation.

scope of application

The products are mainly suitable for all levels of substations with voltage levels of 6KV~220KV, and are installed on the 6KV/10KV/35KV busbars of the substations. Products are widely used in power systems, metallurgy, coal, petrochemical and other industries to improve voltage quality, increase power factor, and reduce line loss.

product model

Model Description

Technical Parameters

Device principle
The voltage and reactive power automatic adjustment device of the substation adopts fixed connection of capacitors without grouping, and the compensation capacity of the capacitor is changed by changing the voltage at both ends of the capacitor. According to the principle of Q=2πfCU2, the voltage and the C value of the capacitor remain unchanged, and the voltage at both ends of the capacitor is changed. Output of reactive power.
Its output capacity can change the accuracy and depth of voltage regulation at (100%~25%) x Q, that is, the adjustment accuracy and depth of capacitors can be changed.
Figure 1 is a block diagram of the working principle of the device:

Device composition

The voltage-regulating automatic compensation device is mainly composed of three parts, namely the voltage regulator, the complete set of capacitors and the voltage and reactive power control panel. Figure 2 is the primary schematic diagram of the device:

Voltage regulator: The regulator connects the capacitor to the busbar, and changes the output voltage of the capacitor under the premise of ensuring the stability of the busbar voltage, so as to ensure that the output capacity of the capacitor meets the system requirements. Voltage and reactive power control panel: According to the input current and voltage signals, the tap judgment is performed, and commands are issued to adjust the main transformer taps of the substation to adjust the voltage to ensure the pass rate of the bus voltage. Adjust the output voltage of the voltage regulator to change the reactive power output of the capacitor. And has corresponding display and signal functions. Capacitive reactive power source of capacitor complete set.

Advantages of the device

a. Compared with the switching type, only one set of capacitor banks can be fixedly connected to realize nine-speed output, and the compensation accuracy is high, which can meet the requirements of system reactive power changes;
b. The on-load self-damaging voltage regulator is adopted to adjust the pressure, the adjustment speed is fast, real-time automatic adjustment can be realized, and the compensation effect is remarkable;
c. It can be closed at low voltage, which greatly reduces the closing inrush current and effectively reduces the impact on the system and capacitors;
d. Compared with switching, it can ensure that the capacitor operates below the rated voltage for a long time, without switching overvoltage and surge current problems, which greatly prolongs the service life of the capacitor;
e. The device has a high degree of automation, complete protection functions, digital communication and remote maintenance functions, and can meet the needs of unattended and maintenance-free;
f. The additional loss is small, only 2% of the capacitor capacity. About one-tenth of the SVC loss;
9. Capacitors do not need to be switched in groups, which reduces equipment such as switching switches and covers an area, and saves infrastructure investment costs;
h. The device does not generate harmonics and will not cause harmonic pollution to the system;
i. When there is a series reactor, the reactance rate of each gear can be guaranteed to be constant;