CN-115714061-B - Vacuum on-load variable pressure regulating device

CN115714061BCN 115714061 BCN115714061 BCN 115714061BCN-115714061-B

Abstract

The invention discloses a vacuum on-load variable voltage regulator, which comprises an oil pressure driving device communicated with a transformer oil cavity, a voltage regulator driven by the oil pressure driving device and used for regulating the number of turns of a secondary coil of a transformer, an electronic switching device and a controller, wherein the oil pressure driving device and the electronic switching device are controlled by the controller, the voltage regulator comprises a plurality of voltage regulator sub-devices, the electronic switching device comprises electronic switching sub-devices with the same number as the voltage regulator sub-devices, the voltage regulator sub-devices and the corresponding electronic switching sub-devices are used for constructing an on-load voltage regulating mechanism, and the scheme is that the oil pressure driving device is designed to execute sectional and mechanical large-range accurate voltage regulation actions, and the electronic switching device is matched for on-load switching, so that the voltage regulating range is expanded, and meanwhile, the stability and safety during voltage regulation are remarkably improved.

Inventors

ZOU YU
SONG YINGUAN
JIANG ZAIXIN
LI SHAOLIANG
FENG SHULEI
CHEN HENGLONG
Weng Tianyue

Assignees

广西电网有限责任公司钦州供电局

Dates

Publication Date: 20260508
Application Date: 20221108

Claims (7)

1. The vacuum on-load variable voltage regulator is characterized by comprising an oil pressure driving device communicated with a transformer oil cavity, a voltage regulator driven by the oil pressure driving device and used for regulating the number of turns of a secondary coil of a transformer, an electronic switching device and a controller, wherein the oil pressure driving device and the electronic switching device are controlled by the controller; The oil pressure driving device comprises an oil guide pipe, a return pipe, a filter cavity, a first oil cavity, a second oil cavity, a first oil pump, a second oil pump, a first oil conveying pipe, a second oil conveying pipe and a two-way oil valve mechanism matched with a pressure regulating sub-device, wherein the oil guide pipe is communicated with a transformer oil cavity and the filter cavity, the first oil cavity and the second oil cavity are respectively communicated with the filter cavity, the first oil pump is used for injecting transformer oil in the first oil cavity into the pressure regulating cavity of the pressure regulating device, the return pipe is communicated with the pressure regulating cavity and the transformer oil cavity, two-way oil valve mechanisms are arranged on the first oil conveying pipe and the second oil conveying pipe, and the second oil pump is respectively communicated with the first oil conveying pipe and the second oil conveying pipe through two-way oil valves so as to inject transformer oil into the driving cavity of the pressure regulating device.
2. The on-load vacuum variable voltage regulator according to claim 1, wherein the voltage regulator comprises a load plate, and a first voltage regulator sub-device, a second voltage regulator sub-device, a third voltage regulator sub-device and a fourth voltage regulator sub-device which are arranged on the load plate, wherein the load plate is communicated with a secondary coil of the transformer and is used for realizing stepless voltage regulation within +/-20% of a rated voltage range according to the load ratio of the load plate.
3. The on-load vacuum variable voltage regulator according to claim 2, wherein the first voltage regulator, the second voltage regulator, the third voltage regulator and the fourth voltage regulator have the same structure, the first voltage regulator comprises a first voltage regulator cavity, a first driving cavity, a first moving block arranged in the first driving cavity, and a conductive head fixedly connected with the first moving block, the contact of the conductive head is in contact with the load plate, and the first moving block synchronously drives the conductive head to move on the load plate to realize stepless voltage regulation when moving in the first driving cavity.
4. A vacuum on-load variable pressure regulating device as set forth in claim 3 wherein the first, second, third and fourth pressure regulating sub-devices are each configured with a bi-directional oil valve mechanism comprising a first bi-directional oil valve and a second bi-directional oil valve in communication with the first and second oil delivery pipes, respectively, the first and second bi-directional oil valves being closed or opened simultaneously to drive movement of corresponding moving blocks within the first or second or third or fourth pressure regulating sub-devices to effect pressure regulation.
5. The vacuum on-load variable pressure regulating device according to claim 2, wherein the load ratio formula of the load plate is as follows: ; in order to provide a load ratio, Maximum voltage adjustable for secondary coil, For the minimum voltage adjustable for the secondary, L is the effective length of the load plate.
6. The vacuum on-load variable voltage regulator according to claim 1, wherein the electronic switching sub-device comprises a first isolating switch, a second isolating switch and an on-load switching sub-mechanism, the first isolating switch is arranged on a first output line, the second isolating switch is arranged on a second output line, the first output line and the second output line are both connected to a common bus, and the on-load switching sub-mechanism is electrically connected between the first output line and the second output line to realize on-load switching; The on-load switching sub-mechanism comprises a first relay, a second relay and a first current limiter, wherein the first end of the first relay is electrically connected to a first output line, the first end of the second relay is electrically connected to a second output line, the second end of the first relay and the second end of the second relay are electrically connected to the first end of the first current limiter, and the second end of the first current limiter is electrically connected to the public bus.
7. The on-load vacuum variable voltage regulator according to claim 6, wherein the controller comprises a load metering unit, a voltage stabilizing driving unit and a relay group, the relay group is used for controlling the on-off of the bidirectional oil valve mechanism and the on-off of the electronic switching sub-device, the load metering unit is used for acquiring voltage fluctuation data of a load end, and the voltage stabilizing driving unit calculates a voltage regulating range and a corresponding voltage value according to the voltage fluctuation data so as to drive the oil pressure driving device to realize voltage regulation.

Description

Vacuum on-load variable pressure regulating device Technical Field The invention relates to the technical field of transformer voltage regulation, in particular to a vacuum on-load variable voltage regulating device. Background The power consumption voltage of the resident users is stable between 198V and 235.4V, but the factors causing the abnormal voltage in the power distribution field are more, the treatment work is heavy, the investment is large, the voltage of the resident users often cannot reach the normal voltage required by the national standard, the reasons causing the unqualified voltage of the resident users in the power distribution field are mainly that a, the power transmission line of the power distribution station is overlong, the voltage drop is overlarge, the tail end of the line is low, b, the power distribution station lacks a reactive compensation device or the capacity of the reactive compensation device is insufficient, c, the power transmission line of the power distribution station is old, the load increase of the station cannot be met, d, the output voltage of the power distribution transformer is abnormal, and the like. Aiming at the condition that the output voltage of the distribution transformer is unqualified due to the reasons, the main current solving measures are imperfect, and mainly comprise the following steps of a, installing a 10kV line series compensation device, b, installing a 10kV line voltage stabilizer, c, adjusting the bus voltage of a transformer substation, d, adjusting a tap switch of the distribution transformer and the like. According to the control method, the main measure for controlling the output voltage of the distribution transformer is to conduct voltage regulation from a higher-level transmission line or transformer substation so as to achieve the purpose that the input voltage of the high-voltage side of the distribution transformer is normal. But because the equipment purchasing cost of higher voltage class is higher, adjusts the precision lower, adjusts many-sided reasons such as ability is worse, carries out voltage treatment in the distribution field that voltage class is lower is more economical, more reliable, the higher treatment mode of precision, is also one direction that needs to attack in the future. At present, the main network transformer gradually adopts an on-load voltage regulation technology, but the field of distribution network still adopts a lagging excitation-free voltage regulation technology, the voltage regulation range of the technology is small, only +/-5%, and when operation and maintenance personnel have power failure voltage regulation, the risk coefficient is high, the working efficiency is low, the voltage regulation requirement of the distribution transformer cannot be met, and the output voltage of the transformer is still uncontrollable. The invention discloses a Chinese patent, publication number is CN106920656B, publication date is 2019, and the publication date is 2 and 19, and the invention relates to a high-voltage autotransformer with an on-load voltage regulating coil, a low-voltage autotransformer without on-load voltage regulation, wherein the first winding head and the tail end of each phase of the autotransformer are connected with the head end or the tail end of the on-load voltage regulating coil through a switch after being connected, the tail end of the on-load voltage regulating coil is used as a negative electrode of the phase, the head end of the on-load voltage regulating coil is used as a positive electrode of the phase, and the head end of a second winding is used as a sliding contact to be connected with the on-load voltage regulating coil. The scheme can realize the voltage regulation of high voltage and low voltage in a large range, but the scheme is to gradually switch to all the stepped positions of the on-load or off-load voltage regulating coils in a sliding contact traversing mode, and sequentially judge whether the voltage regulation meets the requirement or not, and the voltage regulation process is too slow and not specific. Disclosure of Invention The invention aims to solve the problems of small pressure regulating range and low pressure regulating precision faced by the traditional pressure regulating technology, designs the vacuum on-load variable pressure regulating device, performs sectional and mechanical large-range accurate pressure regulating action by designing the oil pressure driving device, and remarkably improves the stability and safety during pressure regulating while expanding the pressure regulating range by matching with the electronic switching device for on-load switching. The technical scheme provided by the embodiment of the invention is that the vacuum on-load variable voltage regulator comprises an oil pressure driving device communicated with a transformer oil cavity, a voltage regulator which is driven by the oil pressure driving device and used for reg