CN216904307U - Pole-mounted reactive power compensation device - Google Patents
Pole-mounted reactive power compensation device Download PDFInfo
- Publication number
- CN216904307U CN216904307U CN202123356404.9U CN202123356404U CN216904307U CN 216904307 U CN216904307 U CN 216904307U CN 202123356404 U CN202123356404 U CN 202123356404U CN 216904307 U CN216904307 U CN 216904307U
- Authority
- CN
- China
- Prior art keywords
- transmission line
- voltage
- pole
- power
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The utility model discloses a pole-mounted reactive power compensation device, which comprises: the detector is connected with the power transmission line and used for acquiring voltage and current in the power transmission line; the controller is connected with the detector and is used for generating a preset control signal according to the voltage and the current of the power transmission line; the throw-cut device is connected with the controller and comprises a first single-pole contactor, a second single-pole contactor and a third single-pole contactor which are respectively connected with three phases of the power transmission line, and the throw-cut device is thrown under the condition that the preset control signal belongs to a first preset control signal; under the condition that the preset control signal belongs to a second preset control signal, the switching device is cut off; and the compensation capacitor is connected with the power transmission line through the switching device and provides reactive compensation for the power transmission line under the condition that the switching device is switched. Each single-pole contactor can be switched on at a voltage zero point and switched off at a current zero point, so that overvoltage and overcurrent are prevented from being borne in the switching and switching processes.
Description
Technical Field
The utility model belongs to the technical field of reactive power compensation devices, and particularly relates to a pole-mounted reactive power compensation device.
Background
Most of the distribution lines are of a tree-shaped structure, the lines are long, and a large number of small-capacity transformers are connected with the distribution lines and are wide in distribution area, so that the voltage quality of end users is poor. Therefore, a commonly adopted scheme at present is to configure a decentralized reactive power compensation device on a line to reduce the line loss of a power grid and improve the voltage quality at the tail end of the line.
In order to enable the column capacitor to be conveniently mounted on the utility pole, the weight of the product must be reduced, and therefore the column capacitor device is generally not provided with a reactor and a discharge coil. However, the reactive power compensation device without the reactor and the discharge coil will bear overvoltage and overcurrent in the switching and breaking processes, thereby reducing the service life of the capacitor.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a pole-mounted reactive power compensation device, which has a light weight and can be conveniently installed on a utility pole, and simultaneously, can prevent overvoltage and overcurrent from being borne during switching and breaking.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a pole-mounted reactive power compensation device comprising:
the detector is connected with the power transmission line and used for acquiring voltage and current in the power transmission line;
the controller is connected with the detector and is used for generating a preset control signal according to the voltage and the current of the power transmission line;
the throw-cut device is connected with the controller and comprises a first single-pole contactor, a second single-pole contactor and a third single-pole contactor which are respectively connected with three phases of the power transmission line, and the throw-cut device is thrown under the condition that the preset control signal belongs to a first preset control signal; under the condition that the preset control signal belongs to a second preset control signal, the switching device is cut off;
and the compensation capacitor is connected with the power transmission line through the switching device and provides reactive compensation for the power transmission line under the condition that the switching device is switched.
On the premise that a reactor and a discharge coil are not configured to reduce the weight of the whole reactive power compensation device, the controller and the first single-pole contactor, the second single-pole contactor and the third single-pole contactor which are controlled independently are arranged, so that each single-pole contactor can be switched on at a voltage zero point and switched off at a current zero point, and overvoltage and overcurrent are prevented from being borne in the switching and switching processes.
Further, the controller comprises a power control unit and a zero-crossing control unit, wherein the power control unit is connected with the detector and is used for acquiring the power factor of the power transmission line in real time based on the voltage and current information of the power transmission line and generating a preset electric signal according to the power factor; the zero-crossing control unit is connected with the power control unit and the detector, and sends a preset control signal to the switching device according to the electric signal and the voltage and current information.
Further, the detector further comprises a voltage transformer and a current transformer, wherein the voltage transformer is connected with any two phases of the power transmission line and detects the voltage of the power transmission line, and the current transformer is connected with one of the two phases of the power transmission line detected by the voltage transformer and detects the current of the power transmission line.
When the power factor is lower than a preset value, the power control unit sends a first electric signal to the zero-crossing control unit, after the zero-crossing control unit receives the first electric signal, the zero-crossing control unit sends a switching control signal to the switching device, the first single-pole contactor and the second single-pole contactor are closed, and the first capacitor unit and the second capacitor unit of the compensation capacitor are connected to the power transmission line to provide reactive compensation; and when the voltage signal passes through a preset angle, closing the third single-pole contactor, and connecting a third capacitor unit of the compensation capacitor into the power transmission line to provide reactive compensation.
When the power factor is higher than a preset value, the power control unit sends a second electric signal to the zero-crossing control unit, and after the zero-crossing control unit receives the second electric signal, the zero-crossing control unit sends a cut-off control signal to the switching device to cut off the reactive power compensation of the second compensation capacitor by disconnecting the second single-pole contactor; and when the current signal passes through a preset angle, the first single-pole contactor and the third single-pole contactor are disconnected.
Optionally, the detector further includes a voltage transformer and a current transformer, the voltage transformer is connected to any two phases of the transmission line and detects a voltage of the transmission line, and the current transformer is connected to a third phase of the transmission line other than the two phases of the transmission line detected by the voltage transformer and detects a current of the third phase of the transmission line.
Preferably, the voltage transformer is a power supply type voltage transformer, and can obtain voltage from a line and provide the voltage for a load. The power supply type voltage transformer can avoid additional power supply.
Preferably, the compensation capacitor is connected with the power transmission line through a drop-out fuse. The drop-out fuse can play a role in protecting the pole-mounted reactive power compensation device.
Preferably, a lightning arrester is arranged in parallel with the compensation capacitor.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following advantages and positive effects:
on the premise that a reactor and a discharge coil are not configured to reduce the weight of the whole reactive power compensation device, the zero-cross control unit and the first single-pole contactor, the second single-pole contactor and the third single-pole contactor which are independently controlled are arranged, so that each single-pole contactor can be switched on again at a voltage zero point and cut off at a current zero point, the distance between switch contacts and the recovery strength of a medium are relatively good, the recovery voltage of the system can be restrained by the parameter, and internal restriking or secondary breakdown can be effectively prevented.
Drawings
The following detailed description of embodiments of the utility model is provided in conjunction with the appended drawings, in which:
fig. 1 is a schematic circuit diagram of an on-pole reactive power compensation device according to the present invention;
description of reference numerals:
101: a voltage transformer; 102: a current transformer; 2: a controller; 201: a power control unit; 202: a zero-crossing control unit; 3: a cutting device; 4: a compensation capacitor; 5: a drop-out fuse; 6: an arrester.
Detailed Description
The utility model is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the utility model.
It should be noted that all directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
The core of the utility model is to provide a column type reactive power compensation device, which comprises:
the detector is used for acquiring circuit parameter information of the power transmission line;
the controller 2 is used for acquiring the circuit parameter information of the power transmission line from the detector and sending out a corresponding preset control signal;
a switching unit 3 including a first single-pole contactor, a second single-pole contactor, and a third single-pole contactor, for controlling the first single-pole contactor, the second single-pole contactor, and the third single-pole contactor to be switched at a voltage zero point and to be switched at a current zero point based on a control signal;
and the compensation capacitor 4 is used for providing reactive compensation when being connected with the power transmission line through the switching device 3.
The controller 2 includes a power control unit 201 and a zero-crossing control unit 202, the power control unit 201 is configured to obtain a power factor of the power transmission line in real time based on the circuit parameter information and generate a preset electric signal according to the power factor, and the zero-crossing control unit 202 sends a preset control signal to the switch 3 according to the received electric signal. The detector comprises a voltage transformer 101 and a current transformer 102, the voltage transformer 101 is used for detecting the voltage between any two phases in the power transmission line in real time, the current transformer 102 is used for detecting the current of one of the two-phase power transmission line detected by the voltage transformer 101, and the power control unit 201 calculates the power factor of the power transmission line according to the voltage and the current. In some cases, the current transformer 102 is used to detect the current of a phase outside the transmission line detected by the voltage transformer 101, and the power control unit 201 calculates the power factor of the transmission line according to the voltage and the current. The control signal controls the switching device 3 to switch the compensation capacitor 4 on and off.
Examples
As shown in fig. 1, a current transformer 102 and a voltage transformer 101 detect information of voltage and current of a transmission line in real time, the current transformer 102 is used for detecting current of a B-phase transmission line, the voltage transformer 101 is a power supply type voltage transformer and is used for detecting A, B phase voltage, and a power control unit 201 calculates power factor of the transmission line based on A, B phase voltage and B-phase current.
When the power factor is lower than 0.9, the power control unit 201 sends a first electric signal to the zero-crossing control unit 202, after the zero-crossing control unit 202 receives the first electric signal, an input control signal is sent to the switch 3 based on a voltage signal between A, B phases, when the zero-crossing control unit judges that the voltage between A, B phases is about to cross zero, the first unipolar contactor and the second unipolar contactor are controlled to be closed, and a first capacitor unit and a second capacitor unit of the compensation capacitor 4 are connected to the power transmission line to provide reactive compensation; and when the voltage signal passes through 90 degrees, closing the third single-pole contactor, and connecting the third capacitor unit of the compensation capacitor 4 into the power transmission line to provide reactive compensation.
When the power factor is higher than 0.95, the power control unit 201 sends a second electric signal to the zero-crossing control unit 202, after the zero-crossing control unit 202 receives the second electric signal, a cutting control signal is sent to the switching device 3 based on the current of the phase B, and when the phase B current is judged to be about to go through zero, the second unipolar contactor is quickly cut off to cut off the reactive compensation of the second compensation capacitor; and when the current signal of the B-phase power transmission line passes through 120 degrees, the first single-pole contactor and the third single-pole contactor are disconnected.
Through the position of the natural zero-crossing point, the distance between the switch contacts and the recovery strength of the medium are relatively good, and at the moment, the parameter can already inhibit the recovery voltage of the system, so that the occurrence of internal restriking or secondary breakdown can be effectively prevented.
The power supply type voltage transformer 101 supplies power to the power control unit 201, the zero-cross control unit 202, and the switch 3, in addition to the voltage signals supplied to the power control unit 201 and the zero-cross control unit 202. No additional power supply is required.
And a drop-out fuse 5 is also connected in series between the power transmission line and the compensation capacitor 3 and is used for protecting the on-pole reactive power compensation device from being damaged by overcurrent.
A lightning arrester 6 is arranged with the compensation capacitor 4 for preventing the compensation capacitor 4 from being damaged by the lightning impulse voltage.
The working process of the present invention is further explained as follows:
when the power factor is lower than a preset value, the power control unit 201 sends a first electric signal to the zero-crossing control unit 202, after the zero-crossing control unit 202 receives the first electric signal, an input control signal is sent to the switching device 3 based on a voltage signal between A, B phases, when the zero-crossing control unit judges that the voltage between A, B phases is about to cross zero, the first unipolar contactor and the second unipolar contactor are controlled to be closed, and a first capacitor unit and a second capacitor unit of the compensation capacitor 4 are connected to the power transmission line to provide reactive compensation; and when the voltage signal passes through a preset angle, closing the third single-pole contactor, and connecting the third capacitor unit of the compensation capacitor 4 into the power transmission line to provide reactive compensation.
When the power factor is higher than the preset value, the power control unit 201 sends a second electric signal to the zero-crossing control unit 202, after receiving the second electric signal, the zero-crossing control unit 202 sends a cutting control signal to the switching device 3 based on the current of the phase B, and when the phase B current is judged to be about to go through zero, the second unipolar contactor is quickly cut off to cut off the reactive compensation of the second compensation capacitor; and when the current signal of the B-phase power transmission line passes through a preset angle, the first single-pole contactor and the third single-pole contactor are disconnected.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (7)
1. A pole-mounted reactive power compensation device, comprising:
the detector is connected with the power transmission line and used for acquiring voltage and current in the power transmission line;
the controller is connected with the detector and is used for generating a preset control signal according to the voltage and the current of the power transmission line;
the throw-cut device is connected with the controller and comprises a first single-pole contactor, a second single-pole contactor and a third single-pole contactor which are respectively connected with three phases of the power transmission line, and the throw-cut device is thrown under the condition that the preset control signal belongs to a first preset control signal; under the condition that the preset control signal belongs to a second preset control signal, the switching device is cut off;
and the compensation capacitor is connected with the power transmission line through the switching device and provides reactive compensation for the power transmission line under the condition that the switching device is switched.
2. The pole-mounted reactive power compensation device according to claim 1, wherein the controller comprises a power control unit and a zero-crossing control unit, the power control unit is connected with the detector and is used for acquiring a power factor of the power transmission line in real time based on voltage and current information of the power transmission line and generating a preset electric signal according to the power factor; the zero-crossing control unit is connected with the power control unit and the detector, and sends a preset control signal to the switching device according to the electric signal and the voltage and current information.
3. The pole-mounted reactive power compensation device according to claim 2, wherein the detector further comprises a voltage transformer and a current transformer, the voltage transformer is connected with any two phases of the transmission line and detects the voltage of the transmission line, and the current transformer is connected with the transmission line of one of the two phases detected by the voltage transformer and detects the current of the transmission line.
4. The pole-mounted reactive power compensation device according to claim 2, wherein the detector further comprises a voltage transformer and a current transformer, the voltage transformer is connected with any two phases of the transmission line and detects the voltage of the transmission line, and the current transformer is connected with a third phase of transmission line except the two phases of transmission line detected by the voltage transformer and detects the current of the transmission line.
5. The pole-mounted reactive power compensation device according to claim 3 or 4, wherein the voltage transformer is a mains voltage transformer, which can be taken from a line and provide voltage to a load.
6. The pole-mounted reactive power compensation device according to any one of claims 1 to 4, wherein the compensation capacitor is connected with the transmission line through a drop-out fuse.
7. A reactive power compensation device on pole according to any of claims 1-4, characterized in that a lightning arrester is arranged in parallel with the compensation capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123356404.9U CN216904307U (en) | 2021-12-29 | 2021-12-29 | Pole-mounted reactive power compensation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123356404.9U CN216904307U (en) | 2021-12-29 | 2021-12-29 | Pole-mounted reactive power compensation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216904307U true CN216904307U (en) | 2022-07-05 |
Family
ID=82207932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123356404.9U Active CN216904307U (en) | 2021-12-29 | 2021-12-29 | Pole-mounted reactive power compensation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216904307U (en) |
-
2021
- 2021-12-29 CN CN202123356404.9U patent/CN216904307U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103208788B (en) | Intelligent Dynamic power network neutral point earthing method and the complete sets of equipment | |
| CN106655120A (en) | Intelligent ground protection method and system for neutral point of power distribution network | |
| CN101950958A (en) | Capacitance-adjusting type arc suppression coil complete device and operation mod of same | |
| CN210693452U (en) | Neutral point grounding control device of medium-voltage power grid | |
| CN202586308U (en) | Comprehensive grounding protective device for microcomputer | |
| CN202444259U (en) | Novel grounding protection and wire selection apparatus for medium-voltage distribution system | |
| CN201008096Y (en) | Arc extinguishing compensation mechanism for neutral point non-effective earthing power network | |
| CN203025307U (en) | Smart line selector of small-current earthing system | |
| CN204928102U (en) | Net fault monitoring processing apparatus is joined in marriage to distributing type self -adaptation | |
| CN2424559Y (en) | Device for fast regulating arc-extinguishing coil | |
| CN216904307U (en) | Pole-mounted reactive power compensation device | |
| CN113258544A (en) | Compensation type intelligent resistance ground fault processing method | |
| CN203377600U (en) | Maintenance-free on-load voltage-adjusting type high-voltage reactive automatic compensation apparatus | |
| CN111509701A (en) | Single bus wiring structure | |
| CN113253043B (en) | Fault identification and initial time calibration method of dynamic grounding processing device | |
| CN100390552C (en) | Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil | |
| CN103219734B (en) | A kind of intelligent type reactive compensation system | |
| CN212323701U (en) | Novel differential line selection comprehensive grounding protection device | |
| CN211744020U (en) | Arc tube management intelligent line selection device | |
| CN110212511B (en) | 66kV arc suppression coil grounding system based on resistance remote automatic switching | |
| CN112186720B (en) | High-speed short circuit current limiting device | |
| CN203883464U (en) | Controllable small-resistor arc-extinguishing device | |
| CN203278248U (en) | Intelligent reactive compensation system | |
| CN108152721B (en) | Method and device for determining parameters of high-speed grounding switch along half-wavelength power transmission line | |
| CN105048411A (en) | 220 kV transformer neutral point gap action control device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |