Using SVR line automatic pressure regulator to solve the low voltage problem of 10kv line

The current measures taken to address the issue of "low voltage" in rural power grid lines mainly include the following: the cross-sectional area of newly constructed wires; Adjust the main transformer tap of the substation to change the system voltage; Reasonably distribute reactive power compensation equipment in the system to improve the distribution of reactive power flow in the power grid; Transform the line and increase the load of the pump station; Increase the number of outgoing lines in the substation to share the load of the original line. The above measures have the following issues.

The construction period of new substations is long, and the investment is huge and the efficiency is slow. Adjust the tap changer of the main transformer in the substation to limit the voltage of the 10kV bus to a certain range to meet the voltage deviation requirements within the radius. Due to the multiple outgoing lines of the substation bus, the load curve and voltage drop of each outgoing line are also different, which cannot ensure that the voltage of all lines meets the requirements. Therefore, this voltage regulation method has poor flexibility and specificity. When the line is complex, it often leads to high voltage near the substation, The voltage is low in places far from the substation.

The use of reactive power compensation is mainly to improve the power factor of the line, and the voltage regulation effect is limited. Relying solely on capacitor compensation cannot solve the problem of voltage reduction caused by line length, fine wire diameter, and resistance.

Adopting measures such as increasing substation transformers and adding new lines as a fundamental solution, but the investment is large and the construction cycle is long.

In the case of limited funds for rural power grid renovation, in order to better and faster solve the problem of low terminal voltage of 10kV long lines in rural power grid, and improve the voltage quality of long lines.

The SVR line automatic Pressure regulator can automatically adjust the gear of the on load tap changer according to the line voltage status to change the node transformation ratio, so as to ensure that the output voltage is stable within a certain range. It can be widely used in power supply lines with long power supply distances, high power load, high voltage fluctuations, and power quality that does not meet the usage standards.

The SVR line automatic Pressure regulator consists of three parts: Autotransformer, on load tap changer and automatic controller.

The whole coil of Autotransformer is divided into three parts: series excitation coil, shunt excitation coil and control coil. The series excitation coil is a winding with multiple taps, which are connected in series between the input and output through different wires of the on load tap changer to change the tap position, thus changing the transformation ratio of the Autotransformer to achieve the purpose of voltage adjustment; The shunt coil is the common winding of the Autotransformer, which generates a magnetic field to transfer energy; The control coil provides the controller with working power and sampling signals.

On load tap changer is a switch that can switch nodes under load. In the automatic Pressure regulator, the taps of the series winding are connected to different nodes of the on load tap changer, and the output voltage can be changed by adjusting the transformer ratio through the conversion node. Considering the lifespan of the on load tap changer and the user's voltage regulation accuracy requirements, the commonly used on load tap changer gears are 7 and 9.

The automatic controller is the core part of the entire device, mainly composed of a microcontroller control chip, display circuit, button circuit, voltage sampling, current sampling, status input, communication port, control output circuit, data storage and other circuits. By collecting the load side voltage and current signal and comparing it with the set value, it sends instructions to control the on-load tap for voltage regulation operation.

For rural areas where there is no room for load growth and there is no distribution of 35kV and above power supplies, the SVR line automatic Pressure regulator has a significant effect on the "low voltage" problem caused by the long power supply radius and small wire diameter of the line. Compared to the construction of new substations and renovation of lines, it saves a lot of funds and has good economic and social benefits. For rural areas with large capacitive loads (with rural structures), the installation of reactive power compensation devices on columns can achieve better "low voltage" governance effects.