CN112924920A - Portable measuring device and parameter measuring method for high-voltage electromagnetic voltage transformer - Google Patents
Portable measuring device and parameter measuring method for high-voltage electromagnetic voltage transformer Download PDFInfo
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- CN112924920A CN112924920A CN202110143637.6A CN202110143637A CN112924920A CN 112924920 A CN112924920 A CN 112924920A CN 202110143637 A CN202110143637 A CN 202110143637A CN 112924920 A CN112924920 A CN 112924920A
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- 238000000034 method Methods 0.000 title claims description 17
- 238000005259 measurement Methods 0.000 claims abstract description 67
- 230000005284 excitation Effects 0.000 claims abstract description 43
- 238000004146 energy storage Methods 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000000691 measurement method Methods 0.000 claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 4
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- 238000010998 test method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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Abstract
The application discloses portable measuring device of high-pressure electromagnetic type voltage transformer includes: the device comprises a power supply module, a mode switch and an output module; the power supply module comprises an energy storage battery, a power electronic inverter bridge and a filtering link, and is used for completing the adjustable function of the amplitude and the frequency of the power supply voltage; providing a power supply with adjustable amplitude and frequency for alternating current test through an inverter, and providing a portable movable measuring device; the parameter measurement function of the voltage transformer is perfected, the bridge output is provided, the distributed capacitance can be measured, and a portable voltage transformer distributed capacitance measurement scheme is provided; the device and the testing method can directly and accurately measure the distributed capacitance and the excitation parameter of the electromagnetic voltage transformer in an integrated manner on site by utilizing the power output with adjustable amplitude and frequency through integrating the two functions of the distributed capacitance measurement and the excitation parameter measurement.
Description
Technical Field
The application relates to the technical field of high-voltage electrical tests, in particular to a portable measuring device and a parameter measuring method for a high-voltage electromagnetic voltage transformer.
Background
The mutual inductor is also called instrument transformer, and is a general name of current mutual inductor and voltage mutual inductor. The high voltage can be changed into low voltage, and the large current can be changed into small current for measuring or protecting the system. Its function is mainly to convert high voltage or large current into standard low voltage (100V) or standard small current (5A or 1A, both referring to rated value) in proportion so as to realize standardization and miniaturization of measuring instrument, protection equipment and automatic control equipment. Meanwhile, the mutual inductor can be used for isolating a high-voltage system so as to ensure the safety of people and equipment.
The electromagnetic voltage transformer (PT) of the transformer substation is used as an important measuring element and can convert high voltage into a standard measuring signal. However, in the normal operation process of the system, it is often easy to resonate with other capacitive elements in the line to excite ferromagnetic resonance, which causes PT fuse blowout and secondary side overvoltage. Excitation and distribution parameters of PT in the transformer substation are accurately and conveniently measured, a transmission and transformation model of system voltage between primary and secondary sides of PT can be accurately established, and the method has important significance for inhibiting ferromagnetic resonance and ensuring safe and stable operation of the system.
However, the technical solutions in the prior art have the following problems: 1. the device is not beneficial to field measurement and is not portable; 2. the device has no function of measuring the distributed capacitance, and the existing device and the technology have single function. Therefore, a portable measuring device and a parameter measuring method for the high-voltage electromagnetic voltage transformer need to be provided.
Disclosure of Invention
The embodiment of the application provides portable measuring device of high-pressure electromagnetic type voltage transformer, includes:
the device comprises a power supply module, a mode switch and an output module;
the power supply module comprises an energy storage battery, a power electronic inverter bridge and a filtering link, and is used for completing the adjustable function of the amplitude and the frequency of the power supply voltage;
the mode switch is used for switching an integrated capacitance measurement mode and an excitation measurement mode, and the integrated capacitance measurement mode and the excitation measurement mode respectively control the measurement of the radial distribution capacitance and the excitation parameter of the electromagnetic voltage transformer;
the output module is used for outputting the measurement capacitor through the bridge in a capacitor measurement mode, and the output module directly outputs the power supply voltage to measure the excitation parameter in an excitation measurement mode.
The embodiment of the application adopts the following technical scheme: the portable measuring device is used for directly and accurately measuring the radial distributed capacitance and the excitation parameter of the electromagnetic voltage transformer on site.
The embodiment of the application adopts the following technical scheme: the mode switch is set as a three-gear self-locking knob selection switch.
The embodiment of the application adopts the following technical scheme: the bridge used for measuring the capacitance is arranged as a hand-held digital display bridge.
The embodiment of the application adopts the following technical scheme: the digital display screen of the handheld digital display electric bridge is set to be a 2.8-inch TFT liquid crystal display screen.
The embodiment of the application further provides a parameter measurement method of the portable measurement device for the high-voltage electromagnetic voltage transformer, which comprises the following steps:
a capacitance measurement mode and an excitation measurement mode;
under the capacitance measurement mode, the distributed capacitance measurement of the electromagnetic voltage transformer is carried out based on the bridge principle, the power supply input is provided by a power supply module with adjustable amplitude and frequency, and the bridge is provided by a fixed capacitor CnAdjustable resistance R3A fixed resistor R4An adjustable capacitor C4And a capacitor C to be measuredxThe device comprises a galvanometer G, a capacitor measuring mode, a short circuit respectively at the primary and secondary ends of the PT to be measured, and a secondary output terminal respectively connected with the output ends of the device by adjusting R3And C4Balancing the bridge, a capacitance C between the secondary windingsxIt can be found that the bridge is balanced such that:
in an excitation measurement mode, through wiring measurement, the output voltage of a power supply module is directly output to the secondary side of a PT to be measured, the secondary side A is an ammeter used for measuring the secondary side current, namely, the excitation current, the secondary side voltage is measured through V1, and the primary side voltage is measured through V2 after being divided by a voltage divider;
the excitation characteristic of the PT to be measured can be obtained by controlling the output voltage to be 20%, 50%, 80%, 100% and 120% of the secondary side rated value of the PT to be measured respectively and measuring the excitation current and the secondary side voltage.
The embodiment of the application adopts the following technical scheme: the output amplitude range of the power supply module is 0-100V, and the frequency is 0-150 Hz.
The embodiment of the application adopts the following technical scheme: the power module comprises an energy storage battery, a power electronic device bridge and a filtering link.
The embodiment of the application adopts the following technical scheme: the output of the energy storage battery is 120V.
The embodiment of the application adopts the following technical scheme: the output module comprises two output modes of bridge output and direct output.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
1. providing a direct current power supply by an energy storage battery, and then providing an alternating current test power supply with adjustable amplitude and frequency by an inverter, and providing a portable and movable measuring device; the parameter measurement function of the voltage transformer is perfected, the bridge output is provided, the distributed capacitance can be measured, and a portable voltage transformer distributed capacitance measurement scheme is provided;
2. a measuring method of the distributed capacitance of the electromagnetic voltage transformer is provided by utilizing the bridge measuring principle. By integrating two functions of distributed capacitance measurement and excitation parameter measurement, the device and the test method can directly and accurately measure the distributed capacitance and the excitation parameter of the electromagnetic voltage transformer in an integrated manner on site by using the power output with adjustable amplitude and frequency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is an overall structural view of a portable measuring device of a high-voltage electromagnetic voltage transformer according to the present application;
FIG. 2 is a structural diagram of an output part of an electric bridge in the parameter measuring method of the high-voltage electromagnetic voltage transformer of the present application;
FIG. 3 is a wiring diagram of the high-voltage electromagnetic voltage transformer in the capacitance measurement mode according to the parameter measurement method of the present application;
fig. 4 is a wiring diagram in an excitation measurement mode in the high-voltage electromagnetic voltage transformer parameter measurement method of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Example 1
Portable measuring device of high-pressure electromagnetic type voltage transformer includes:
the device comprises a power supply module, a mode switch and an output module;
the power supply module comprises an energy storage battery, a power electronic inverter bridge and a filtering link, and is used for completing the adjustable function of the amplitude and the frequency of the power supply voltage;
the mode switch is used for switching an integrated capacitance measurement mode and an excitation measurement mode, and the integrated capacitance measurement mode and the excitation measurement mode respectively control the measurement of the radial distribution capacitance and the excitation parameter of the electromagnetic voltage transformer;
the output module is used for outputting the measurement capacitor through the bridge in a capacitor measurement mode, and the output module directly outputs the power supply voltage to measure the excitation parameter in an excitation measurement mode.
The portable measuring device is used for directly and accurately measuring the radial distributed capacitance and the excitation parameter of the electromagnetic voltage transformer on site.
The mode switch is set as a three-gear self-locking knob selection switch; the bridge used by the measuring capacitor is set as a handheld digital display bridge; the digital display screen of the handheld digital display electric bridge is set to be a 2.8-inch TFT liquid crystal display screen.
Providing a direct current power supply by an energy storage battery, and then providing an alternating current test power supply with adjustable amplitude and frequency by an inverter, and providing a portable and movable measuring device; the parameter measurement function of the voltage transformer is perfected, the bridge output is provided, the distributed capacitance can be measured, and a portable voltage transformer distributed capacitance measurement scheme is provided; a measuring method of the distributed capacitance of the electromagnetic voltage transformer is provided by utilizing the bridge measuring principle. By integrating two functions of distributed capacitance measurement and excitation parameter measurement, the device and the test method can directly and accurately measure the distributed capacitance and the excitation parameter of the electromagnetic voltage transformer in an integrated manner on site by using the power output with adjustable amplitude and frequency.
The embodiment of the application further provides a parameter measurement method of the portable measurement device for the high-voltage electromagnetic voltage transformer, which comprises the following steps:
a capacitance measurement mode and an excitation measurement mode;
under the capacitance measurement mode, the distributed capacitance measurement of the electromagnetic voltage transformer is carried out based on the bridge principle, the power supply input is provided by a power supply module with adjustable amplitude and frequency, and the bridge is provided by a fixed capacitor CnAdjustable resistance R3A fixed resistor R4An adjustable capacitor C4And a capacitor C to be measuredxThe device comprises a galvanometer G, a capacitor measuring mode, a short circuit respectively at the primary and secondary ends of the PT to be measured, and a secondary output terminal respectively connected with the output ends of the device by adjusting R3And C4Balancing the bridge, a capacitance C between the secondary windingsxIt can be found that the bridge is balanced such that:
in an excitation measurement mode, through wiring measurement, the output voltage of a power supply module is directly output to the secondary side of a PT to be measured, the secondary side A is an ammeter used for measuring the secondary side current, namely, the excitation current, the secondary side voltage is measured through V1, and the primary side voltage is measured through V2 after being divided by a voltage divider;
the excitation characteristic of the PT to be measured can be obtained by controlling the output voltage to be 20%, 50%, 80%, 100% and 120% of the secondary side rated value of the PT to be measured respectively and measuring the excitation current and the secondary side voltage.
The output amplitude range of the power supply module is 0-100V, and the frequency is 0-150 Hz; the power supply module comprises an energy storage battery, a power electronic device bridge and a filtering link; the output of the energy storage battery is 120V;
the output module comprises two output modes of bridge output and direct output.
In summary, the following steps: providing a direct current power supply by an energy storage battery, and then providing an alternating current test power supply with adjustable amplitude and frequency by an inverter, and providing a portable and movable measuring device; the parameter measurement function of the voltage transformer is perfected, the bridge output is provided, the distributed capacitance can be measured, and a portable voltage transformer distributed capacitance measurement scheme is provided;
a measuring method of the distributed capacitance of the electromagnetic voltage transformer is provided by utilizing the bridge measuring principle. By integrating two functions of distributed capacitance measurement and excitation parameter measurement, the device and the test method can directly and accurately measure the distributed capacitance and the excitation parameter of the electromagnetic voltage transformer in an integrated manner on site by using the power output with adjustable amplitude and frequency.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. Portable measuring device of high-pressure electromagnetic type voltage transformer, its characterized in that includes:
the device comprises a power supply module, a mode switch and an output module;
the power supply module comprises an energy storage battery, a power electronic inverter bridge and a filtering link, and is used for completing the adjustable function of the amplitude and the frequency of the power supply voltage;
the mode switch is used for switching an integrated capacitance measurement mode and an excitation measurement mode, and the integrated capacitance measurement mode and the excitation measurement mode respectively control the measurement of the radial distribution capacitance and the excitation parameter of the electromagnetic voltage transformer;
the output module is used for outputting the measurement capacitor through the bridge in a capacitor measurement mode, and the output module directly outputs the power supply voltage to measure the excitation parameter in an excitation measurement mode.
2. The portable measuring device of the high-voltage electromagnetic voltage transformer of claim 1, wherein: the portable measuring device is used for directly and accurately measuring the radial distributed capacitance and the excitation parameter of the electromagnetic voltage transformer on site.
3. The portable measuring device of the high-voltage electromagnetic voltage transformer of claim 1, wherein: the mode switch is set as a three-gear self-locking knob selection switch.
4. The portable measuring device of the high-voltage electromagnetic voltage transformer of claim 1, wherein: the bridge used for measuring the capacitance is arranged as a hand-held digital display bridge.
5. The portable measuring device of the high-voltage electromagnetic voltage transformer of claim 4, wherein: the digital display screen of the handheld digital display electric bridge is set to be a 2.8-inch TFT liquid crystal display screen.
6. The method for measuring the parameters of the portable measuring device of the high-voltage electromagnetic voltage transformer according to claim 1, comprising the following steps:
a capacitance measurement mode and an excitation measurement mode;
under the capacitance measurement mode, the distributed capacitance measurement of the electromagnetic voltage transformer is carried out based on the bridge principle, the power supply input is provided by a power supply module with adjustable amplitude and frequency, and the bridge is provided by a fixed capacitor CnAdjustable resistance R3A fixed resistor R4An adjustable capacitor C4And a capacitor C to be measuredxThe device comprises a galvanometer G, a capacitor measuring mode, a short circuit respectively at the primary and secondary ends of the PT to be measured, and a secondary output terminal respectively connected with the output ends of the device by adjusting R3And C4Balancing the bridge, a capacitance C between the secondary windingsxIt can be found that the bridge is balanced such that:
in an excitation measurement mode, through wiring measurement, the output voltage of a power supply module is directly output to the secondary side of a PT to be measured, the secondary side A is an ammeter used for measuring the secondary side current, namely, the excitation current, the secondary side voltage is measured through V1, and the primary side voltage is measured through V2 after being divided by a voltage divider;
the excitation characteristic of the PT to be measured can be obtained by controlling the output voltage to be 20%, 50%, 80%, 100% and 120% of the secondary side rated value of the PT to be measured respectively and measuring the excitation current and the secondary side voltage.
7. The parameter measurement method of the portable measurement device of the high-voltage electromagnetic voltage transformer as claimed in claim 6, wherein: the output amplitude range of the power supply module is 0-100V, and the frequency is 0-150 Hz.
8. The parameter measurement method of the portable measurement device of the high-voltage electromagnetic voltage transformer according to claim 7, characterized in that: the power module comprises an energy storage battery, a power electronic device bridge and a filtering link.
9. The parameter measurement method of the portable measurement device of the high-voltage electromagnetic voltage transformer according to claim 7, characterized in that: the output of the energy storage battery is 120V.
10. The parameter measurement method of the portable measurement device of the high-voltage electromagnetic voltage transformer according to claim 5, characterized in that: the output module comprises two output modes of bridge output and direct output.
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| CN202110143637.6A CN112924920A (en) | 2021-02-02 | 2021-02-02 | Portable measuring device and parameter measuring method for high-voltage electromagnetic voltage transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702709A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
| CN113702714A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method for measuring capacitance value of high-voltage arm of direct-current voltage transformer |
| CN116683401A (en) * | 2023-07-28 | 2023-09-01 | 华中科技大学 | Resonance overvoltage protection method and system for electronic voltage transformer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702709A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
| CN113702714A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method for measuring capacitance value of high-voltage arm of direct-current voltage transformer |
| CN113702714B (en) * | 2021-07-20 | 2023-12-08 | 中国电力科学研究院有限公司 | Method for measuring capacitance value of high-voltage arm of direct-current voltage transformer |
| CN113702709B (en) * | 2021-07-20 | 2024-04-09 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
| CN116683401A (en) * | 2023-07-28 | 2023-09-01 | 华中科技大学 | Resonance overvoltage protection method and system for electronic voltage transformer |
| CN116683401B (en) * | 2023-07-28 | 2023-10-10 | 华中科技大学 | Resonance overvoltage protection method and system for electronic voltage transformer |
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