CN111983286A - Unbalanced current testing device and system for large-capacity cluster capacitor bank - Google Patents
Unbalanced current testing device and system for large-capacity cluster capacitor bank Download PDFInfo
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- CN111983286A CN111983286A CN202010810335.5A CN202010810335A CN111983286A CN 111983286 A CN111983286 A CN 111983286A CN 202010810335 A CN202010810335 A CN 202010810335A CN 111983286 A CN111983286 A CN 111983286A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 160
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 230000005284 excitation Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The application provides a large capacity cluster capacitor group unbalance current testing arrangement and system, includes: a variable frequency power supply; the excitation transformer is connected with the variable frequency power supply; the capacitor bank is connected between the positive pole and the negative pole of the excitation transformer; the controller is connected with the variable frequency power supply; the A/D conversion module is connected with the controller; the voltage and current detection module is connected with the A/D conversion module; the unbalanced current of the high-capacity cluster capacitor bank can be accurately and reliably measured by the current and voltage detection module, and the specific capacitor bank with large deviation can be detected according to the measurement result.
Description
Technical Field
The application relates to the technical field of electrical measurement, in particular to a device and a system for testing unbalanced current of a large-capacity cluster capacitor bank.
Background
The series compensation device, the SVC and the AC and DC filters in the converter station mainly comprise a large-capacity cluster capacitor bank. The unbalance degree of the large-capacity cluster capacitor is increased due to the change of the operating environment and the problems of aging failure, damage and the like of the internal units of the capacitor. The maintenance personnel are difficult to replace and level the electricity, and the maintenance time is long. When one group of capacitor banks have problems, the conventional measuring equipment can normally measure the unbalanced current, but when the two groups of capacitor banks have problems and are symmetrical, the conventional product cannot be tested; alternatively, the entire capacitor bank ages, but the entire bank is balanced and conventional products are not tested as well. It is desirable to provide a solution to facilitate more accurate and reliable measurement of the imbalance current of a bulk cluster capacitor bank.
Disclosure of Invention
An object of the application is to provide a large capacity cluster capacitor group unbalance current testing arrangement and system for realize measuring the technical effect of the big capacitor group of deviation value of location when the unbalance current of large capacity cluster capacitor group more accurately reliably.
In a first aspect, an embodiment of the present application provides a device for testing an unbalanced current of a large-capacity cluster capacitor bank, including a variable frequency power supply; the excitation transformer is connected with the variable frequency power supply; the capacitor bank is connected between the positive pole and the negative pole of the excitation transformer; the controller is connected with the variable frequency power supply; the A/D conversion module is connected with the controller; the voltage and current detection module is connected with the A/D conversion module; the capacitor bank comprises a first capacitor bank, a second capacitor bank, a third capacitor bank and a fourth capacitor bank; the first end of the first capacitor bank and the first end of the second capacitor bank are connected with the anode of the excitation transformer; the first end of the third capacitor bank and the first end of the fourth capacitor bank are connected with the negative electrode of the excitation transformer; the second end of the first capacitor bank is connected with the second end of the third capacitor bank; the second end of the second capacitor bank is connected with the second end of the fourth capacitor bank; the voltage and current detection module is used for detecting the current passing through each capacitor bank, the unbalanced current between the second end of the first capacitor bank and the second end of the second capacitor bank, and the first voltage at the two ends of the first capacitor bank and the second voltage at the two ends of the second capacitor bank.
Further, the unbalanced current testing device for the large-capacity cluster capacitor bank further comprises a compensation inductor connected between the positive pole and the negative pole of the excitation transformer.
Further, the voltage and current detection module comprises a first ammeter connected in series with the first capacitor bank; a second ammeter in series with the second capacitor bank; a third ammeter in series with the third capacitor bank; a fourth ammeter in series with the fourth capacitor bank; a fifth ammeter connected between the second end of the first capacitor bank and the second end of the second capacitor bank; and the first voltmeter is connected with two ends of the first capacitor bank in parallel and the second voltmeter is connected with two ends of the second capacitor bank in parallel.
Further, the fifth ammeter is a multi-gear automatic switching type ammeter.
Further, the unbalanced current testing device for the large-capacity cluster capacitor bank further comprises a filter circuit connected with the input end of the variable frequency power supply.
Further, the unbalanced current testing device for the large-capacity cluster capacitor bank further comprises an upper computer connected with the controller.
Further, the large capacity cluster capacitor bank unbalanced current test device further comprises a remote communication device connected with the controller.
Further, the unbalanced current test device for the large-capacity cluster capacitor bank also comprises a display connected with the controller.
In a second aspect, an embodiment of the present application provides a system for testing an unbalanced current of a large-capacity cluster capacitor bank, which includes a remote management platform and a plurality of devices for testing an unbalanced current of a large-capacity cluster capacitor bank connected to the remote management platform.
The beneficial effect that this application can realize is: the unbalanced current testing device for the large-capacity cluster capacitor bank can accurately and reliably measure the unbalanced current of the large-capacity cluster capacitor bank, and can detect out which capacitor bank has large deviation according to the measurement result.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic view of a topology structure of an unbalanced current testing apparatus for a large-capacity cluster capacitor bank according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating an unbalanced current testing apparatus for a large-capacity cluster capacitor bank according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a topology structure of an unbalanced current testing system for a large-capacity cluster capacitor bank according to an embodiment of the present application.
Icon: 10-a large capacity cluster capacitor bank unbalance current test system; 100-a large capacity cluster capacitor bank unbalance current testing device; 110-a variable frequency power supply; 120-an excitation transformer; 130-compensation inductance; 140-a capacitor bank; 150-a controller; 160-A/D conversion module; 170-voltage current detection module; 200-a filter circuit; 300-an upper computer; 400-a remote communication device; 500-a display; 600-remote management platform.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic diagram illustrating a topology of an unbalanced current testing apparatus for a large-capacity cluster capacitor bank according to an embodiment of the present application; fig. 2 is a schematic diagram illustrating an unbalanced current testing apparatus for a large-capacity cluster capacitor bank according to an embodiment of the present disclosure; fig. 3 is a schematic diagram of a topology structure of an unbalanced current testing system for a large-capacity cluster capacitor bank according to an embodiment of the present application.
As shown in fig. 1 and fig. 2, an unbalanced current testing apparatus 100 for a large-capacity cluster capacitor bank provided by the embodiment of the present application includes a variable frequency power supply 110; an excitation transformer 120 connected to the variable frequency power source 110; a capacitor bank 140 connected between the positive and negative poles of the exciting transformer 120; a controller 150 connected to the variable frequency power supply 110; an a/D conversion module 160 connected to the controller 150; a voltage current detection module 170 connected to the a/D conversion module 160; the capacitor bank 140 includes a first capacitor bank C1, a second capacitor bank C2, a third capacitor bank C3, and a fourth capacitor bank C4; a first end of the first capacitor bank C1 and a first end of the second capacitor bank C2 are connected to the positive pole of the excitation transformer 120; the first end of the third capacitor bank C3 and the first end of the fourth capacitor bank C4 are connected to the negative pole of the excitation transformer 120; a second terminal of the first capacitor bank C1 is connected to a second terminal of the third capacitor bank C3; a second terminal of the second capacitor bank C2 is connected to a second terminal of the fourth capacitor bank C4; the voltage and current detection module 170 is configured to detect a current passing through each of the capacitor sets, an unbalanced current between the second terminal of the first capacitor set C1 and the second terminal of the second capacitor set C2, and a first voltage across the first capacitor set C1 and a second voltage across the second capacitor set C2. Illustratively, the controller 150 may be a single chip, a PLC controller, or other general-purpose controller.
After the controller 150 obtains the voltage and current signals, the capacitance values of the four capacitor bridge arms can be calculated in the following manner,
capacitive reactance of the capacitor C1:
the frequency f is read directly from the frequency converter, so:
and because:
namely:
A1and V1The value of (4) is taken to calculate the capacitance, if the frequency f is read directly from the frequency converter. In the same way, the values of C2, C3 and C4 can be obtained, so that the capacitance deviation of a specific capacitor bridge arm can be accurately obtained. The unbalanced current can be passed through a fifth ammeter A5The measurement is performed directly.
In one embodiment, the voltage and current are detectedThe measurement module 170 includes a first ammeter A connected in series with a first capacitor bank C11(ii) a A second ammeter A connected in series with a second capacitor bank C22(ii) a A third ammeter A connected in series with a third capacitor bank C33(ii) a A fourth ammeter A connected in series with a fourth capacitor bank C44(ii) a A fifth ammeter A connected between the second terminal of the first capacitor group C1 and the second terminal of the second capacitor group C25(ii) a And a first voltmeter V connected in parallel across the first capacitor bank C11And a second voltmeter V connected in parallel across the second capacitor bank C22. Further, a fifth ammeter A5The multi-gear automatic switching type ammeter (such as a mass instrument QB9 full-automatic intelligent shifting ammeter) can be selected, the measurement width is large, and the application range is wide.
In one embodiment, the unbalanced current testing apparatus 100 for a large-capacity clustered capacitor bank further comprises a compensation inductor 130 connected between the positive and negative poles of the excitation transformer 120, and the capacitance reactance of the capacitor bank can be compensated dynamically by the compensation inductor 130.
In one embodiment, in order to ensure the stability of the input commercial power, a filter circuit 200 may be further disposed at the input end of the variable frequency power supply 110. The filter circuit 200 may be an RC filter circuit or an LC filter circuit.
In one embodiment, the unbalanced current test apparatus 100 for a large-capacity cluster capacitor bank further comprises an upper computer 300 connected to the controller 150. The detected voltage and current of the voltage and current detection module 170 are converted by the a/D conversion module 160 and then transmitted to the controller 150, and the controller 150 further transmits to the upper computer 300 for display. The controller 150 may also be directly connected to the display 500, and the data detected by the voltage and current detection module 170 may be directly displayed through the display 500.
In one embodiment, the large capacity cluster capacitor bank unbalanced current test apparatus 100 further comprises a remote communication device 400 connected to the controller 150. Through the remote communication apparatus 400, the controller 150 can transmit the received voltage and current detection data to a remote terminal for remote monitoring. The remote communication device 400 can be a 4G communication module, a 5G communication module, a ZigBee wireless communication module, or the like.
As shown in fig. 3, the embodiment of the present application further provides a large-capacity clustered capacitor bank unbalanced current test system 10, which includes a remote management platform 600 and a plurality of large-capacity clustered capacitor bank unbalanced current test apparatuses 100 connected to the remote management platform 600. The voltage and current detection data acquired by the unbalanced current testing device 100 of each large-capacity cluster capacitor bank is sent to the remote management platform 600, and the remote management platform 600 is used for uniformly managing and monitoring a plurality of devices.
In summary, the embodiment of the present application provides a device for testing an unbalanced current of a high-capacity cluster capacitor bank, which includes a variable frequency power supply; the excitation transformer is connected with the variable frequency power supply; a capacitor bank connected between the positive and negative poles of the exciting transformer; the controller is connected with the variable frequency power supply; the A/D conversion module is connected with the controller; the voltage and current measuring module is connected with the A/D conversion module; the capacitor bank comprises a first capacitor bank, a second capacitor bank, a third capacitor bank and a fourth capacitor bank; the first end of the first capacitor bank and the first end of the second capacitor bank are connected with the anode of the excitation transformer; the first end of the third capacitor bank and the first end of the fourth capacitor bank are connected with the negative electrode of the excitation transformer; the second end of the first capacitor bank is connected with the second end of the third capacitor bank; the second end of the second capacitor bank is connected with the second end of the fourth capacitor bank; the voltage and current measuring module is used for detecting the current passing through each capacitor bank, the unbalanced current between the second end of the first capacitor bank and the second end of the second capacitor bank, and the first voltage at the two ends of the first capacitor bank and the second voltage at the two ends of the second capacitor bank; the unbalanced current of the high-capacity cluster capacitor bank can be accurately and reliably measured, and the specific capacitor bank with large deviation can be detected according to the measurement result.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. An apparatus for testing an unbalanced current of a large-capacity cluster capacitor bank, comprising: a variable frequency power supply; the excitation transformer is connected with the variable frequency power supply; the capacitor bank is connected between the positive pole and the negative pole of the excitation transformer; the controller is connected with the variable frequency power supply; the A/D conversion module is connected with the controller; the voltage and current detection module is connected with the A/D conversion module;
the capacitor bank comprises a first capacitor bank, a second capacitor bank, a third capacitor bank and a fourth capacitor bank; the first end of the first capacitor bank and the first end of the second capacitor bank are connected with the anode of the excitation transformer; the first end of the third capacitor bank and the first end of the fourth capacitor bank are connected with the negative electrode of the excitation transformer; the second end of the first capacitor bank is connected with the second end of the third capacitor bank; the second end of the second capacitor bank is connected with the second end of the fourth capacitor bank;
the voltage and current detection module is used for detecting the current passing through each capacitor bank, the unbalanced current between the second end of the first capacitor bank and the second end of the second capacitor bank, and the first voltage at the two ends of the first capacitor bank and the second voltage at the two ends of the second capacitor bank.
2. The large capacity cluster capacitor bank unbalance current testing apparatus according to claim 1, wherein the large capacity cluster capacitor bank unbalance current testing apparatus further comprises a compensation inductance connected between the positive and negative poles of the excitation transformer.
3. The apparatus of claim 1, wherein the voltage current detection module comprises a first current meter in series with the first capacitor bank; a second ammeter in series with the second capacitor bank; a third ammeter in series with the third capacitor bank; a fourth ammeter in series with the fourth capacitor bank; a fifth ammeter connected between the second end of the first capacitor bank and the second end of the second capacitor bank; and the first voltmeter is connected with two ends of the first capacitor bank in parallel and the second voltmeter is connected with two ends of the second capacitor bank in parallel.
4. The unbalanced current test apparatus of a large capacity cluster capacitor bank as claimed in claim 3, wherein the fifth ammeter is a multi-tap automatic switching ammeter.
5. The apparatus of claim 1, further comprising a filter circuit coupled to an input of the variable frequency power supply.
6. The large capacity cluster capacitor bank unbalance current testing apparatus according to claim 1, further comprising an upper computer connected to the controller.
7. The large capacity cluster capacitor bank unbalanced current testing apparatus of claim 1, further comprising a remote communication device connected to the controller.
8. The large capacity cluster capacitor bank unbalanced current testing apparatus of claim 1, further comprising a display connected to the controller.
9. A large capacity clustered capacitor bank unbalanced current test system comprising a remote management platform and a plurality of large capacity clustered capacitor bank unbalanced current test apparatus as claimed in any one of claims 1 to 8 connected to the remote management platform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010810335.5A CN111983286A (en) | 2020-08-13 | 2020-08-13 | Unbalanced current testing device and system for large-capacity cluster capacitor bank |
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| CN202010810335.5A CN111983286A (en) | 2020-08-13 | 2020-08-13 | Unbalanced current testing device and system for large-capacity cluster capacitor bank |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100315102A1 (en) * | 2008-01-15 | 2010-12-16 | Pixcir Microelectronics Co., Ltd. | Device for quantifying an electric unbalance and touch detection system incorporating it |
| CN103344843A (en) * | 2013-07-29 | 2013-10-09 | 国家电网公司 | Measurement system of series compensation capacitor group |
| CN104076197A (en) * | 2014-07-14 | 2014-10-01 | 国家电网公司 | Unbalanced current testing device and method for capacitor bank |
| CN108988367A (en) * | 2018-08-07 | 2018-12-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of H-type wiring capacitance device group degree of unbalancedness leveling method |
-
2020
- 2020-08-13 CN CN202010810335.5A patent/CN111983286A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100315102A1 (en) * | 2008-01-15 | 2010-12-16 | Pixcir Microelectronics Co., Ltd. | Device for quantifying an electric unbalance and touch detection system incorporating it |
| CN103344843A (en) * | 2013-07-29 | 2013-10-09 | 国家电网公司 | Measurement system of series compensation capacitor group |
| CN104076197A (en) * | 2014-07-14 | 2014-10-01 | 国家电网公司 | Unbalanced current testing device and method for capacitor bank |
| CN108988367A (en) * | 2018-08-07 | 2018-12-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of H-type wiring capacitance device group degree of unbalancedness leveling method |
Non-Patent Citations (2)
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Application publication date: 20201124 |