CN109212456B - Method and system for determining measurement stability of measurement winding voltage of power supply type voltage transformer - Google Patents
Method and system for determining measurement stability of measurement winding voltage of power supply type voltage transformer Download PDFInfo
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- CN109212456B CN109212456B CN201811044531.5A CN201811044531A CN109212456B CN 109212456 B CN109212456 B CN 109212456B CN 201811044531 A CN201811044531 A CN 201811044531A CN 109212456 B CN109212456 B CN 109212456B
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- G01—MEASURING; TESTING
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- 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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Abstract
The invention discloses a method and a system for determining the measurement stability of the voltage of a measurement winding of a power supply type voltage transformer, wherein the method comprises the following steps: monitoring the measurement winding voltage of the power supply type voltage transformer under different power loads after error compensation and the primary side voltage of the power supply type voltage transformer under different power loads when the measurement winding is in a no-load state and a full-load state respectively; acquiring the measurement error of the measurement winding voltage and the primary side voltage under each power load; and respectively comparing the measurement error under each power load with a preset error threshold value to determine the measurement stability of the measurement winding voltage of the power supply type voltage transformer. The invention can measure the measurement error of the voltage measurement winding of the power supply type voltage transformer under different power loads when the measurement winding is in a no-load state and a full-load state, thereby determining the measurement stability of the voltage of the measurement winding of the power supply type voltage transformer and providing data support for the field operation of the large-capacity power supply transformer.
Description
Technical Field
The present invention relates to the technical field of high-voltage electrical equipment, and more particularly, to a method and system for determining measurement stability of a measurement winding voltage of a power supply type voltage transformer.
Background
The large-capacity power supply transformer can take power from a high-voltage transmission line of 110kV or above and convert the power into 380V or 220V to be directly supplied to users for use. The transformer can directly get electricity from a high-voltage line, simplifies the power grid level, simplifies the operation mode, greatly improves the power utilization reliability, and is beneficial supplement to the flexible power supply mode of the power grid at the present stage. For equipment, the loss of the transformer can be greatly reduced by directly converting the high voltage into 380V or 220V. As shown in fig. 1, a schematic diagram of a power supply scheme for a large-capacity power supply transformer is provided.
The large-capacity power supply transformer is particularly suitable for power supply in remote areas, is inconvenient for erecting a 10kV distribution network line for a single load and is directly connected with a nearby high-voltage transmission line. For example, oil and gas engineering, mining areas, frontier troops, miniature transformer substations with requirements on construction time and floor area, emergency power supply recovery, and the transformer substations can replace transformers for transformer substation stations to supply power to transformer substation loads. The high-capacity power supply transformer comprises a power output winding and a voltage measuring winding. The power output winding is used for supplying power to users, and the voltage measuring winding can realize electric energy metering.
Since the voltage measuring winding is used for the electric energy metering of the transformer, the voltage measuring winding is required to have good measuring stability. However, under a large power supply, how to determine the measurement stability of the voltage measurement winding is a technical problem to be solved.
Disclosure of Invention
The invention provides a method and a system for determining the voltage measurement stability of a measurement winding of a power supply type voltage transformer, which are used for solving the problem of how to determine the voltage stability of the measurement winding of the power supply type voltage transformer.
In order to solve the above problems, according to an aspect of the present invention, there is provided a method of determining measurement winding voltage measurement stability of a power supply type voltage transformer, characterized in that the method comprises:
step 1, setting compensation parameters of an error compensation unit, and adjusting a measurement winding load connected to a measurement winding of a power supply type voltage transformer to enable the measurement winding to be in an idle state;
step 2, adjusting power loads connected to power output windings of the power supply type voltage transformer according to preset adjusting step lengths, and monitoring measurement winding voltages of power winding voltages of the power supply type voltage transformer subjected to error compensation under different power loads and primary side voltages of the power supply type voltage transformer under different power loads;
step 3; respectively acquiring measurement errors of the measurement winding voltage and the primary side voltage under each power load by using a transformer calibrator;
step 4, comparing the measurement error under each power load with a preset error threshold value respectively, judging whether the measurement error under each power load is smaller than or equal to the preset error threshold value, if so, adjusting the measurement winding load connected to the measurement winding when the measurement winding is in an idle state, so that the measurement winding is in a full-load state, and returning to the step 2; when the measurement winding is in a full-load state, determining that the measurement winding voltage measurement stability of the power supply type voltage transformer is stable; and otherwise, determining that the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable.
Preferably, wherein the method further comprises:
when the power load is adjusted to enable the primary side voltage of the power supply type voltage transformer to be reduced to a preset percentage of a preset primary side voltage threshold value, the transformation ratio of the voltage regulator is adjusted to enable the primary side voltage of the power supply type voltage transformer to meet the test requirement.
Preferably, wherein said measurement error comprises: the preset error threshold comprises: a preset specific difference error threshold value and a preset angular difference error threshold value.
Preferably, the determining whether the measurement error under each power load is less than or equal to the preset error threshold includes:
and judging whether the specific difference under each power load is less than or equal to the specific difference error threshold, and meanwhile, whether the angular difference is less than or equal to the angular difference error threshold.
Preferably, wherein the method further comprises:
and when the voltage measurement stability of the measurement winding of the power supply type voltage transformer is unstable, adjusting the compensation parameters of an error compensation unit until the voltage measurement stability of the measurement winding of the power supply type voltage transformer is stable.
According to another aspect of the present invention, there is provided a system for determining measurement stability of a measurement winding voltage of a power supply type voltage transformer, the system comprising:
the setting module is used for setting the compensation parameters of the error compensation unit and adjusting the load of a measurement winding connected to the measurement winding of the power supply type voltage transformer to enable the measurement winding to be in an idle state;
the voltage monitoring module is used for adjusting power loads connected to a power output winding of the power supply type voltage transformer according to preset adjusting step lengths, and monitoring the measurement winding voltage of the power supply type voltage transformer subjected to error compensation under different power loads and the primary side voltage of the power supply type voltage transformer under different power loads;
the measurement error acquisition module is used for respectively acquiring the measurement errors of the measurement winding voltage and the primary side voltage under each power load by using a mutual inductor calibrator;
the voltage measurement stability judging module is used for respectively comparing the measurement error under each power load with a preset error threshold value, judging whether the measurement error under each power load is smaller than or equal to the preset error threshold value, if so, adjusting the measurement winding load connected to the measurement winding when the measurement winding is in an idle state, so that the measurement winding is in a full-load state, and entering the voltage monitoring module; when the measurement winding is in a full-load state, determining that the measurement winding voltage measurement stability of the power supply type voltage transformer is stable; and otherwise, determining that the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable.
Preferably, wherein the system further comprises:
the primary side voltage adjusting module is used for adjusting the transformation ratio of the voltage regulator when the power load is adjusted to enable the primary side voltage of the power supply type voltage transformer to be reduced to a preset percentage of a preset primary side voltage threshold value, so that the primary side voltage of the power supply type voltage transformer meets the test requirement.
Preferably, wherein the measurement error comprises: the preset error threshold comprises: a preset specific difference error threshold value and a preset angular difference error threshold value.
Preferably, the voltage measurement stability determining module determines whether the measurement error under each power load is less than or equal to the preset error threshold by:
and judging whether the specific difference under each power load is less than or equal to the specific difference error threshold, and meanwhile, whether the angular difference is less than or equal to the angular difference error threshold.
Preferably, wherein the system further comprises:
and the error compensation adjusting module is used for adjusting the compensation parameters of the error compensation unit when the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable until the measurement stability of the measurement winding voltage of the power supply type voltage transformer is stable.
The invention provides a method and a system for determining the measurement stability of the voltage of a measurement winding of a power supply type voltage transformer, which comprises the following steps: connecting a power load on a power winding of a power supply type voltage transformer, connecting a measurement winding load on the measurement winding, gradually increasing the power load according to a preset adjustment step length when the measurement winding is in a no-load state and a full-load state, and monitoring the measurement winding voltage of the power supply type voltage transformer subjected to error compensation under different power loads and the primary side voltage of the power supply type voltage transformer under different power loads; acquiring the measurement error of the measurement winding voltage and the primary side voltage under each power load; and respectively comparing the measurement error under each power load with a preset error threshold value to determine the measurement stability of the measurement winding voltage of the power supply type voltage transformer. The invention can measure the measurement error of the voltage measurement winding of the power supply type voltage transformer under different power loads when the measurement winding is in a no-load state and a full-load state under the condition that the power load fluctuates from 0 to full load, thereby determining the measurement stability of the voltage of the measurement winding of the power supply type voltage transformer and providing data support for the field operation of the large-capacity power supply transformer.
Drawings
Exemplary embodiments of the invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a schematic diagram of a power supply scheme of a high-capacity power supply transformer;
FIG. 2 is a flow chart of a method 200 of determining measurement winding voltage measurement stability of a powered voltage transformer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of determining voltage stability of a measurement winding of a powered voltage transformer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a system 400 for determining measurement winding voltage measurement stability of a power supply type voltage transformer according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same reference numerals are used for the same modules/elements.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 2 is a flow chart of a method 200 of determining measurement winding voltage measurement stability of a power supply type voltage transformer according to an embodiment of the present invention. As shown in fig. 2, the method for determining the measurement stability of the voltage of the measurement winding of the power supply type voltage transformer according to the embodiment of the invention can measure the measurement error of the voltage measurement winding of the power supply type voltage transformer under different power loads when the measurement winding is in the no-load and full-load states under the fluctuation of the power load ranging from 0 to full load, thereby determining the measurement stability of the voltage of the measurement winding of the power supply type voltage transformer and providing data support for the field operation of the large-capacity power supply transformer. The method for determining the measurement stability of the measurement winding voltage of the power supply type voltage transformer provided by the embodiment of the invention starts from step 201, and sets the compensation parameters of the error compensation unit in step 201, and adjusts the measurement winding load connected to the measurement winding of the power supply type voltage transformer to enable the measurement winding to be in an idle state.
Preferably, in step 202, the power load connected to the power output winding of the power supply type voltage transformer is adjusted according to a preset adjustment step size, and the measurement winding voltage of the power supply type voltage transformer after error compensation under different power loads and the primary side voltage of the power supply type voltage transformer under different power loads are monitored.
Preferably, in step 203, a transformer calibrator is used to obtain the measurement error of the measured winding voltage and the primary side voltage of each power load, respectively.
Preferably, wherein the measurement error comprises: the preset error threshold comprises: a preset specific difference error threshold value and a preset angular difference error threshold value.
Preferably, in step 204, the measurement error under each power load is compared with a preset error threshold, and it is determined whether the measurement error under each power load is less than or equal to the preset error threshold, if so, when the measurement winding is in an idle state, the measurement winding load connected to the measurement winding is adjusted to make the measurement winding in a full-load state, and the process returns to step 202; when the measurement winding is in a full-load state, determining that the measurement winding voltage measurement stability of the power supply type voltage transformer is stable; and otherwise, determining that the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable.
Preferably, the determining whether the measurement error under each power load is less than or equal to the preset error threshold includes:
and judging whether the specific difference under each power load is less than or equal to the specific difference error threshold, and meanwhile, whether the angular difference is less than or equal to the angular difference error threshold.
Preferably, wherein the method further comprises:
when the power load is adjusted to enable the primary side voltage of the power supply type voltage transformer to be reduced to a preset percentage of a preset primary side voltage threshold value, the transformation ratio of the voltage regulator is adjusted to enable the primary side voltage of the power supply type voltage transformer to meet the test requirement.
In the test process, adjusting the power load can make supply type voltage transformer's primary side voltage reduce, for make supply type voltage transformer's primary side voltage satisfies the experimental requirement, in the test process, when supply type voltage transformer's primary side voltage reduces to the power frequency voltage when predetermineeing the percentage, adjusts the transformation ratio of voltage regulator.
Preferably, wherein the method further comprises:
and when the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable, adjusting the compensation parameters of the error compensation unit until the measurement stability of the measurement winding voltage of the power supply type voltage transformer is stable.
Fig. 3 is a schematic diagram of determining voltage stability of a measurement winding of a supply-type voltage transformer according to an embodiment of the present invention. As shown in fig. 3, a power load Z1 is connected to the power winding of the power supply type voltage transformer, the load ranges from 0 to 60kVA, a measurement winding load Z2 is connected to the measurement winding, and a standard voltage transformer is connected in parallel to the primary side of the power supply type voltage transformer to measure the primary side voltage. In the process of determining the voltage stability, firstly, the compensation parameters of the error compensation unit are set, and the load of the measurement winding connected to the measurement winding of the power supply type voltage transformer is adjusted, so that the measurement winding is in an idle state. And then, adjusting the power load connected to the power output winding of the power supply type voltage transformer according to a preset adjusting step length, and monitoring the measurement winding voltage of the power supply type voltage transformer subjected to error compensation under different power loads and the primary side voltage of the power supply type voltage transformer under different power loads. Then, the transformer calibrator is used to determine the specific and angular differences at each power load. And finally, respectively comparing the measurement error under each power load with a preset error threshold, and judging whether the ratio difference and the angle difference under each power load are both less than or equal to the preset ratio difference error threshold and the preset angle difference error threshold. If the voltage measurement stability of the measuring winding is met, adjusting the load of the measuring winding connected with the measuring winding to enable the measuring winding to be in a full-load state, then returning to the voltage monitoring step, and calculating the error of the measuring winding in the full-load state to determine the voltage measurement stability of the measuring winding. And if the measurement voltage and the measurement voltage are not satisfied simultaneously, determining that the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable. And then, adjusting the compensation parameters of the error compensation unit until the voltage measurement stability of the measurement winding of the power supply type voltage transformer is stable.
Fig. 4 is a schematic diagram of a system 400 for determining measurement winding voltage measurement stability of a power supply type voltage transformer according to an embodiment of the present invention. As shown in fig. 4, the system 400 for determining the measurement stability of the winding voltage of a power supply type voltage transformer provided by the embodiment of the invention comprises: the device comprises a setting module 401, a voltage monitoring module 402, a measurement error obtaining module 403 and a voltage measurement stability judging module 404.
Preferably, the setting module 401 is configured to set a compensation parameter of the error compensation unit, and adjust a measurement winding load connected to a measurement winding of the power supply type voltage transformer, so that the measurement winding is in an idle state.
Preferably, the voltage monitoring module 402 is configured to adjust a power load connected to a power output winding of the power supply type voltage transformer according to a preset adjustment step size, and monitor a measurement winding voltage of the power supply type voltage transformer after error compensation under different power loads and a primary side voltage of the power supply type voltage transformer under different power loads.
Preferably, the measurement error obtaining module 403 is configured to obtain the measurement error of the measurement winding voltage and the measurement error of the primary side voltage under each power load by using a transformer calibrator.
Preferably, wherein the measurement error comprises: the preset error threshold comprises: a preset specific difference error threshold value and a preset angular difference error threshold value.
Preferably, the voltage measurement stability determining module 404 is configured to compare the measurement error under each power load with a preset error threshold, and determine whether the measurement error under each power load is smaller than or equal to the preset error threshold, if yes, adjust the measurement winding load connected to the measurement winding when the measurement winding is in an idle load state, so that the measurement winding is in a full load state, and enter the voltage monitoring module; when the measuring winding is in a full-load state, determining that the voltage measuring stability of the measuring winding of the power supply type voltage transformer is stable; and otherwise, determining that the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable.
Preferably, the voltage measurement stability determining module determines whether the measurement error under each power load is less than or equal to the preset error threshold by: and judging whether the specific difference under each power load is less than or equal to the specific difference error threshold, and meanwhile, whether the angular difference is less than or equal to the angular difference error threshold.
Preferably, wherein the system further comprises:
the primary side voltage adjusting module is used for adjusting the transformation ratio of the voltage regulator when the power load is adjusted to enable the primary side voltage of the power supply type voltage transformer to be reduced to a preset percentage of a preset primary side voltage threshold value, so that the primary side voltage of the power supply type voltage transformer meets the test requirement.
Preferably, wherein the system further comprises:
and the error compensation adjusting module is used for adjusting the compensation parameters of the error compensation unit when the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable until the measurement stability of the measurement winding voltage of the power supply type voltage transformer is stable.
The system 400 for determining the measurement stability of the measurement winding voltage of the power supply type voltage transformer according to the embodiment of the present invention corresponds to the method 200 for determining the measurement stability of the measurement winding voltage of the power supply type voltage transformer according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ means, component, etc ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (8)
1. A method of determining measurement stability of a measurement winding voltage of a power supply type voltage transformer, the method comprising:
step 1, setting compensation parameters of an error compensation unit, and adjusting a measurement winding load connected to a measurement winding of a power supply type voltage transformer to enable the measurement winding to be in an idle state;
step 2, adjusting power loads connected to power output windings of the power supply type voltage transformer according to preset adjusting step lengths, and monitoring measurement winding voltages of power winding voltages of the power supply type voltage transformer subjected to error compensation under different power loads and primary side voltages of the power supply type voltage transformer under different power loads;
step 3; respectively acquiring measurement errors of the measurement winding voltage and the primary side voltage under each power load by using a transformer calibrator;
step 4, comparing the measurement error under each power load with a preset error threshold value respectively, judging whether the measurement error under each power load is smaller than or equal to the preset error threshold value, if so, adjusting the measurement winding load connected to the measurement winding when the measurement winding is in an idle state, so that the measurement winding is in a full-load state, and returning to the step 2; when the measurement winding is in a full-load state, determining that the measurement winding voltage measurement stability of the power supply type voltage transformer is stable; otherwise, determining that the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable;
wherein the method further comprises:
when the power load is adjusted to enable the primary side voltage of the power supply type voltage transformer to be reduced to a preset percentage of a preset primary side voltage threshold value, the transformation ratio of the voltage regulator is adjusted to enable the primary side voltage of the power supply type voltage transformer to meet the test requirement.
2. The method of claim 1, wherein measuring the error comprises: the preset error threshold comprises: a preset specific difference error threshold value and a preset angular difference error threshold value.
3. The method of claim 2, wherein the determining whether the measurement error under each power load is less than or equal to the preset error threshold comprises:
and judging whether the specific difference under each power load is less than or equal to the specific difference error threshold, and meanwhile, whether the angular difference is less than or equal to the angular difference error threshold.
4. The method of claim 1, further comprising:
and when the measurement stability of the measurement winding voltage of the power supply type voltage transformer is unstable, adjusting the compensation parameters of the error compensation unit until the measurement stability of the measurement winding voltage of the power supply type voltage transformer is stable.
5. A system for determining measurement stability of a measurement winding voltage of a power supply type voltage transformer, the system comprising:
the setting module is used for setting the compensation parameters of the error compensation unit and adjusting the load of a measurement winding connected to the measurement winding of the power supply type voltage transformer to enable the measurement winding to be in an idle state;
the voltage monitoring module is used for adjusting power loads connected to a power output winding of the power supply type voltage transformer according to preset adjusting step length, and monitoring the measured winding voltage of the power supply type voltage transformer after error compensation under different power loads and the primary side voltage of the power supply type voltage transformer under different power loads;
the measurement error acquisition module is used for respectively acquiring the measurement errors of the measurement winding voltage and the primary side voltage under each power load by using a mutual inductor calibrator;
the voltage measurement stability judging module is used for respectively comparing the measurement error under each power load with a preset error threshold value, judging whether the measurement error under each power load is smaller than or equal to the preset error threshold value, if so, adjusting the measurement winding load connected to the measurement winding when the measurement winding is in an idle state, so that the measurement winding is in a full-load state, and entering the voltage monitoring module; when the measurement winding is in a full-load state, determining that the measurement winding voltage measurement stability of the power supply type voltage transformer is stable; otherwise, determining that the voltage measurement stability of the measurement winding of the power supply type voltage transformer is unstable;
wherein the system further comprises:
the primary side voltage adjusting module is used for adjusting the transformation ratio of the voltage regulator when the power load is adjusted to enable the primary side voltage of the power supply type voltage transformer to be reduced to a preset percentage of a preset primary side voltage threshold value, so that the primary side voltage of the power supply type voltage transformer meets the test requirement.
6. The system of claim 5, wherein measuring the error comprises: the preset error threshold comprises: a preset specific difference error threshold value and a preset angular difference error threshold value.
7. The system of claim 6, wherein the voltage measurement stability determining module determining whether the measurement error under each power load is less than or equal to the preset error threshold comprises:
and judging whether the specific difference under each power load is less than or equal to the specific difference error threshold, and meanwhile, whether the angular difference is less than or equal to the angular difference error threshold.
8. The system of claim 5, further comprising:
and the error compensation adjusting module is used for adjusting the compensation parameters of the error compensation unit when the voltage measurement stability of the measurement winding of the power supply type voltage transformer is unstable until the voltage measurement stability of the measurement winding of the power supply type voltage transformer is stable.
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| CN101556320B (en) * | 2009-04-30 | 2011-10-26 | 厦门红相电力设备股份有限公司 | On-site calibrating method and device of capacitor voltage transformer |
| CN102360857B (en) * | 2011-05-30 | 2013-01-16 | 国网电力科学研究院 | Integrated network distributing transformer with error compensating mutual inductor |
| CN107422291A (en) * | 2017-09-14 | 2017-12-01 | 中国电力科学研究院 | A kind of AC extra high voltage voltage transformer error check system and method |
| CN107611983A (en) * | 2017-09-30 | 2018-01-19 | 中国电力科学研究院 | A kind of integration apparatus for realizing error compensation power supply |
| CN207663042U (en) * | 2017-10-24 | 2018-07-27 | 中国电力科学研究院有限公司 | 1000kV AC extra high voltage current transformer errors verify mobile platform |
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