CN108089144A - Electronic current mutual inductor field calibration system and method - Google Patents
Electronic current mutual inductor field calibration system and method Download PDFInfo
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- CN108089144A CN108089144A CN201810122314.7A CN201810122314A CN108089144A CN 108089144 A CN108089144 A CN 108089144A CN 201810122314 A CN201810122314 A CN 201810122314A CN 108089144 A CN108089144 A CN 108089144A
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- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000012795 verification Methods 0.000 claims description 24
- 239000013307 optical fiber Substances 0.000 claims description 14
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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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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Abstract
The present invention provides a kind of electronic current mutual inductor field calibration systems and method, system to include：The single bus scheme for the electronic current mutual inductor that standard current transformer, current lifting device, calibration equipment and access are tested；Wherein, in single bus scheme, the three-phase of the two adjacent spaces electronic current mutual inductor that respectively connection one is tested, and two phase terminals (201) and terminal (204) that two adjacent spaces are closed on are respectively connected to current lifting device and standard current transformer, in the other two-phase at interval, terminal (202) is connected with terminal (203), and terminal (205) is connected with terminal (206).The present invention solves the problems, such as that testing process is cumbersome in current intelligent substation electronic current mutual inductor field-checking, improves the field-checking efficiency of electronic current mutual inductor.
Description
Technical Field
The invention relates to the power technology, in particular to a field calibration system and method for an electronic current transformer.
Background
With the continuous development of key technologies of intelligent power grids and intelligent substations, the intelligent substations in China are increased explosively, and the number of intelligent devices in the intelligent substations is increased more and more. For a transformer in a transformer substation, on-site verification is required before commissioning, and for on-site verification of an electronic transformer from an intelligent transformer substation, the on-site verification is more complicated and requires more time than the on-site verification of an electromagnetic transformer of a traditional transformer substation. The field calibration of the mutual inductor needs to be carried out in a power failure mode, and cross operation cannot be carried out in the power failure mode. Therefore, the improvement of the field checking work efficiency of the electronic transformer of the intelligent substation has important significance on construction, operation and maintenance of the intelligent substation.
In the prior art, an electronic current transformer checking wiring diagram given in national grid enterprise standard Q/GDW 690-2011 "electronic transformer field checking specification" is shown in fig. 1, a transformer checking scheme shown in fig. 1 is adopted, only one electronic current transformer can be checked on site at each time, one electronic current transformer needs to be checked on site at each time, a test line needs to be disconnected once, a secondary test line needs to be disconnected, and test equipment and auxiliary equipment need to be moved according to the position of a tested article.
Disclosure of Invention
In order to improve the field verification efficiency of the electronic current transformer, the embodiment of the invention provides a field verification system of the electronic current transformer, which comprises: the system comprises a standard current transformer, a current booster, a checking device and a single bus connection wire for connecting to an electronic current transformer to be tested; wherein,
in the single-bus wiring, two adjacent three phases are respectively connected with a tested electronic current transformer, two adjacent two-phase terminals (201) and (204) are respectively connected with the current booster and the standard current transformer, the other two phases at intervals are respectively connected with the terminal (202) and the terminal (203), and the terminal (205) and the terminal (206).
In the embodiment of the invention, the output optical fiber of the merging unit is connected with the input terminal of the checking device, and the time setting terminal of the merging unit is connected with the synchronous signal output terminal of the checking device.
In the embodiment of the invention, the output optical fiber of the merging unit is connected with the input terminal of the checking device, and the time synchronization terminal of the merging unit and the synchronous signal input terminal of the checking device are simultaneously connected with the time synchronization signal of the whole station.
In the embodiment of the present invention, the electronic current transformer calibration system further includes: a voltage regulator;
the output end of the voltage regulator is connected with the input end of the current booster.
Meanwhile, the invention also discloses an electronic current transformer checking method, which is used for checking the tested electronic current transformer by using the electronic current transformer checking system and comprises the following steps:
closing the circuit breakers and isolating switches connected into two adjacent intervals of the tested electronic current transformer, and disconnecting the circuit breakers and isolating switches at other outgoing line intervals;
the tested electronic current transformer in the form of a single bus wiring is connected in series to the checking circuit;
and connecting the merging units corresponding to the intervals with a verifying device, connecting test voltage, adjusting a voltage regulator, and verifying tested electronic current transformers accessed at the intervals.
Meanwhile, the invention also provides an electronic current transformer field calibration system, which comprises: the system comprises a standard current transformer, a current booster, a checking device and a double-bus connection wire for connecting to an electronic current transformer to be tested; wherein,
in the double-bus wiring, two adjacent three phases are connected with a tested electronic current transformer respectively, the two adjacent two-phase terminals (401) and (404) are connected with the current booster and the standard current transformer respectively, the other two phases are connected, the terminal (402) and the terminal (403) are connected, and the terminal (405) and the terminal (406) are connected.
Meanwhile, the invention also provides an electronic current transformer checking method, which is used for checking the tested electronic current transformer by using the electronic current transformer checking system and comprises the following steps:
closing the disconnecting switches and the circuit breakers connected into the two intervals of the tested electronic current transformer and the bus-tie interval, communicating the two intervals with the two buses, and simultaneously disconnecting the disconnecting switches and the transformers of other outgoing line intervals;
connecting the tested electronic current transformer connected by the double buses in series into a checking circuit;
and connecting the merging units corresponding to the intervals with a verifying device, connecting test voltage, and adjusting the voltage regulator to verify the tested electronic current transformers accessed at the intervals.
The invention solves the problem of complicated test flow in the field calibration of the electronic current transformer of the intelligent substation at present, and overcomes the defect that one primary test wire and one secondary test wire are continuously disconnected and connected, and test equipment and auxiliary equipment are repeatedly moved in the prior art. The invention can reduce the repeated wiring times, the boosting/upwelling times, the repeated moving of experimental equipment and the automatic judgment and identification of the verification points of a plurality of error channels of a plurality of mutual inductors at high efficiency.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram illustrating a calibration wiring diagram of an electronic current transformer in the prior art;
FIG. 2 is a block diagram of an electronic current transformer calibration system according to the present disclosure;
FIG. 3 is a flowchart illustrating a method for calibrating an electronic current transformer according to the present disclosure;
FIG. 4 is a block diagram of an electronic current transformer calibration system according to the present disclosure;
FIG. 5 is a flowchart illustrating a method for calibrating an electronic current transformer according to the present disclosure;
FIG. 6 is a schematic diagram of an embodiment of the present invention;
FIG. 7 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The embodiment of the invention provides an electronic current transformer field calibration system, as shown in fig. 2, comprising: the system comprises a standard current transformer 101, a current booster 102, a checking device 103 and a single bus connection connected to an electronic current transformer to be tested; wherein,
in the single bus connection, three phases of two adjacent intervals 10 and 11 are respectively connected with a tested electronic current transformer, two adjacent interval adjacent two-phase terminals 201 and 204 are respectively connected with the current booster 102 and the standard current transformer 101, the other two phases of the interval are respectively connected with the terminal 202 and the terminal 203, the terminal 205 and the terminal 206, and the secondary output end of the standard current transformer 101 is connected with the secondary analog input terminal of the checking device.
In the embodiment of the invention, the output optical fiber of the merging unit is connected with the input terminal of the checking device 103, and the time setting terminal of the merging unit is connected with the synchronous signal output terminal of the checking device; or,
the output optical fiber of the merging unit is connected with the input terminal of the checking device, and the timing terminal of the merging unit and the synchronous signal input terminal of the checking device are simultaneously connected with the timing signal of the whole station.
Meanwhile, the present invention also provides an electronic current transformer calibration method, which utilizes the electronic current transformer calibration system to calibrate the tested electronic current transformer, as shown in fig. 3, including:
step S301, closing the circuit breakers and isolating switches connected to the tested electronic current transformer at two adjacent intervals, and disconnecting the circuit breakers and isolating switches at other outgoing line intervals;
step S302, connecting the tested electronic current transformer in the form of a single bus connecting line in series to a checking circuit;
and step S303, connecting the merging units corresponding to the intervals with a checking device, connecting the test voltage, adjusting the voltage regulator, and checking the tested electronic current transformer accessed at the intervals.
Meanwhile, the present invention also provides an on-site calibration system for an electronic current transformer, which calibrates the electronic current transformer in a double-bus connection, as shown in fig. 4, the system includes: the system comprises a standard current transformer 101, a current booster 102, a checking device 103 and a double-bus wiring for accessing to an electronic current transformer to be tested;
in the double bus bar connection, three phases of two adjacent spaces 41 and 42 are respectively connected with a tested electronic current transformer, two adjacent space adjacent two-phase terminals 401 and 404 are respectively connected with the current booster and the standard current transformer, the other two phases of the spaces are respectively connected with the terminals 402 and 403, and the terminals 405 and 406.
Meanwhile, the invention also provides an electronic current transformer checking method, which is used for checking the tested electronic current transformer by using the electronic current transformer checking system, and as shown in fig. 5, the method comprises the following steps:
step S501, two isolating switches and circuit breakers connected into two intervals of the tested electronic current transformer and a bus-tie interval are closed, the two intervals are communicated with two buses, and isolating switches and transformers of other outgoing line intervals are disconnected;
step S502, connecting the tested electronic current transformer connected by the double buses in series into a checking circuit;
and step S503, connecting the merging units corresponding to the intervals with a checking device, connecting the test voltage, and adjusting the voltage regulator to check the tested electronic current transformers accessed at the intervals.
Through the technical scheme of the invention, the problem that the test flow of the existing electronic current transformer in the form of single-bus/double-bus wiring of the intelligent substation is complicated in field check is solved, and the problems that one primary test wire, one secondary test wire, one repeatedly moving test equipment and one auxiliary equipment are required to be disconnected and connected continuously in the prior art are solved, so that the purposes of reducing the times of repeated wiring, reducing the times of boosting/current rising, reducing the repeated moving of the test equipment, simultaneously checking a plurality of error channels of a plurality of transformers, automatically judging and identifying verification points and the like in high-efficiency field check are achieved. The technical solution of the present invention will be described in further detail with reference to specific embodiments.
The field high-efficiency test scheme of the single-bus wiring type electronic current transformer in the embodiment of the invention is as follows:
the single bus wiring form is widely applied to the primary electrical main wiring of a power system, is commonly arranged on the low-voltage side of a 500kV transformer substation and the medium-voltage side of a 220kV transformer substation, and has the advantages of simple and clear structure, simplicity and convenience in operation, easy interlocking between a circuit breaker and a disconnecting switch, effective prevention of misoperation accidents, and the characteristics of less primary equipment, low operating cost and the like.
In order to improve the efficiency of field testing of the electronic current transformer in the form of single bus connection, a schematic diagram of this embodiment is shown in fig. 6.
In this embodiment, the high-voltage switching apparatus operates: closing the disconnecting switches and the circuit breakers at the adjacent intervals to be tested; disconnecting the interval switches and the circuit breakers at other outgoing line intervals;
the first wiring is that as shown in the figure, the far end two phases of the two adjacent intervals 601 and 602 are respectively connected, such as a first phase and a second phase, the two adjacent intervals are led out and are respectively connected to a current booster and a standard current transformer, such as a third phase and a ③, the output end of a voltage regulator is connected with the input end of the current booster, and the current booster, the tested electronic current transformer and the standard current transformer are connected in series;
secondary wiring: the secondary outputs S1 and S2 of the standard current transformer are connected with a secondary analog input terminal of the checking device; the output optical fiber of the merging unit is connected with a data input terminal of the checking device; the merging unit time tick terminal connects the calibration equipment and connects the calibration equipment synchronizing signal output terminal, or the merging unit and the calibration equipment synchronizing signal input terminal access the total station time tick signal simultaneously.
And (3) field verification process:
1. performing high-voltage switch electric appliance operation, primary current wiring and secondary wiring according to the requirements;
2. connecting the 601 interval corresponding merging unit with a checking device, switching on test voltage, adjusting a voltage regulator, checking 3 electronic current transformers at the 601 intervals simultaneously, and recording checking data, wherein the voltage regulator returns to zero and is powered off;
3. connecting the 602 interval corresponding merging unit with a checking device, connecting test voltage, adjusting a voltage regulator, checking 3 phases of 3 electronic current transformers at intervals of 602 simultaneously, and recording checking data, wherein the voltage regulator returns to zero and is powered off;
4. the primary wire and the secondary wire are removed, and the original position of the high-voltage switch electric appliance is restored.
In the traditional verification scheme, for the 12 groups of error data and the experimental equipment, 1 voltage regulator, 1 current booster, 1 standard current transformer, one set of verification equipment, 2 primary large current lines, 2 secondary test lines and 2 optical fibers are needed in total for the 6 electronic current transformers configured by the merging unit of the ' A set and the ' B set '; in the aspect of test process, at least 6 times of primary wiring, 12 times of secondary wiring and 12 times of upflow are needed, and the continuous moving of the equipment is accompanied.
In the aspect of experimental equipment, the scheme disclosed by the embodiment needs 1 voltage regulator, 1 current booster, 1 standard current transformer, one set of calibration equipment, 4 primary large current wires, 2 secondary test wires and 2 optical fibers, and only 2 large current wires are added compared with the traditional calibration scheme; in the aspect of the test process, if the check equipment can only be connected with one merging unit, the test only needs one-time wiring, 1-time secondary wiring and 4-time upflow, and the equipment does not need to be moved in the process. If the checking equipment can be connected with a plurality of merging units and can be checked simultaneously, the number of times can be reduced in the aspect of the current rise times, if the checking equipment can be connected with 2 merging units, the current rise times are reduced to 2 times, if the checking equipment can be connected with 4 merging units, the current rise times are reduced to 1 time, and therefore 1 time current rise total checking of 12 sets of error parameters corresponding to 6 electronic current transformers by one wiring pair can be achieved.
In the embodiment of the invention, the field high-efficiency test scheme of the double-bus wiring type electronic current transformer comprises the following steps:
double bus connection form wide application is in electric once main connection of electric power system, often in 500kV transformer substation middling pressure side and 220kV transformer substation high pressure side etc. and double bus connection's advantage is that overhauls any a set of generating line and can not break off the power supply, and when arbitrary return circuit breaker overhauld, advantages such as work can be replaced to the circuit breaker of female antithetical couplet.
In order to improve the field test efficiency of the electronic current transformer in the form of double bus connection, the principle of the efficient test scheme of the invention is shown in fig. 7.
Operation of the high-voltage switch electric appliance: closing the disconnecting switches and the circuit breakers in the interval 2201 and the interval 2202 to be tested and the bus tie interval, and closing the disconnecting switches I and IV or II and III to ensure that the interval 2201 and the interval 2202 are respectively communicated with the two buses; disconnecting the interval switches and the circuit breakers at other outgoing line intervals;
the first wiring is that the far ends of the 2201 interval and the 2202 interval are respectively connected as shown in the figure, such as wiring ② and II, the two adjacent phases of the 2201 interval and the 2202 interval are led out and are respectively connected to the current booster and the standard current transformer, such as ② and ③, the output end of the voltage regulator is connected with the input end of the current booster, and the current booster, the tested electronic current transformer and the standard current transformer are connected in series;
secondary wiring: the secondary outputs S1 and S2 of the standard current transformer are connected with a secondary analog input terminal of the checking device; the output optical fiber of the merging unit is connected with a data input terminal of the checking device; the merging unit time tick terminal connects the calibration equipment and connects the calibration equipment synchronizing signal output terminal, or the merging unit and the calibration equipment synchronizing signal input terminal access the total station time tick signal simultaneously.
And (3) field verification process:
1. performing high-voltage switch electric appliance operation, primary current wiring and secondary wiring according to the requirements;
2. connecting the 2201 interval corresponding merging unit with a verifying device, connecting test voltage, adjusting a voltage regulator, simultaneously verifying 3 electronic current transformers at 2201 intervals in 3 phases, and recording verification data, wherein the voltage regulator returns to zero and is powered off;
3. connecting the bus-tie interval corresponding merging unit with a checking device, switching on test voltage, adjusting a voltage regulator, checking 3 phases of 3 electronic current transformers in the bus-tie interval simultaneously, and recording checking data to enable the voltage regulator to return to zero and power off;
4. connecting the 2202 interval corresponding merging unit with a checking device, connecting test voltage, adjusting a voltage regulator, checking 3 phase electronic current transformers 2202 at intervals simultaneously, and recording checking data, wherein the voltage regulator returns to zero and is powered off;
5. the primary wire and the secondary wire are removed, and the original position of the high-voltage switch electric appliance is restored.
In the traditional verification scheme, for the 12 electronic current transformers configured by the merging unit of the 'A set + the B set', for the 24 groups of error data, in the aspect of experimental equipment, 1 voltage regulator, 1 current booster, 1 standard current transformer, one set of verification equipment, 2 primary large current lines, 2 secondary test lines and 2 optical fibers are required; in the aspect of test process, at least 12 times of primary wiring, 24 times of secondary wiring and 24 times of upflow are needed, and the continuous moving of the equipment is accompanied.
By adopting the scheme provided by the embodiment of the invention, in the aspect of experimental equipment, 1 voltage regulator, 1 current booster, 1 standard current transformer, one set of calibration equipment, 4 primary large current wires, 2 secondary test wires and 2 optical fibers are required, and only 2 large current wires are added compared with the traditional calibration scheme; in the aspect of the test process, if the verification equipment can only be connected with one merging unit, the test only needs one-time wiring, 1-time secondary wiring and 6-time upflow, and the equipment does not need to be moved in the process. If the checking equipment can be connected with a plurality of merging units and can be checked simultaneously, the number of times can be reduced in the aspect of the current rise times, if the checking equipment can be connected with 2 merging units, the current rise times are reduced to 3 times, if the checking equipment can be connected with 6 merging units, the current rise times are reduced to 1 time, and therefore, the 1-time current rise total checking of 24 groups of error parameters corresponding to 12 electronic current transformers by one wiring pair can be realized.
The invention can carry out on-site check on the electronic current transformer in the single-bus/double-bus connection mode, including the conditions of check before commissioning, first check after commissioning, periodic check, temporary check and the like, and can carry out on-site check on the electronic current transformer through the configuration of the primary connection, the operation of the high-voltage switch electric appliance and the check equipment of the technical scheme of the invention, thereby improving the on-site check efficiency of the electronic current transformer.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The field calibration system for the electronic current transformer is characterized by comprising the following components: the system comprises a standard current transformer, a current booster, a calibration device and a single bus connection wire connected with an electronic current transformer to be tested; wherein,
in the single bus connection, two adjacent three phases are respectively connected with a tested electronic current transformer, the two adjacent two-phase terminals (201) and (204) are respectively connected with the current booster and the standard current transformer, the other two phases at intervals are respectively connected with the terminal (202) and the terminal (203), and the terminal (205) and the terminal (206).
2. The field calibration system of an electronic current transformer according to claim 1, wherein the output optical fiber of the merging unit is connected with the input terminal of the checking device, and the time-setting terminal of the merging unit is connected with the synchronous signal output terminal of the checking device.
3. The field calibration system of an electronic current transformer according to claim 1, wherein the output optical fiber of the merging unit is connected to the input terminal of the checking device, and the time synchronization terminal of the merging unit and the synchronization signal input terminal of the calibrating device are simultaneously connected to the time synchronization signal of the whole station.
4. The electronic current transformer field verification system of claim 1, wherein the electronic current transformer verification system further comprises: a voltage regulator;
the output end of the voltage regulator is connected with the input end of the current booster.
5. An electronic current transformer on-site verification method, which is characterized in that the method utilizes the electronic current transformer verification system of claims 1-4 to verify the tested electronic current transformer, and the method comprises the following steps:
closing the circuit breakers and isolating switches connected into two adjacent intervals of the tested electronic current transformer, and disconnecting the circuit breakers and isolating switches at other outgoing line intervals;
the tested electronic current transformer in the form of a single bus wiring is connected in series to the checking circuit;
and connecting the merging units corresponding to the intervals with a verifying device, connecting test voltage, adjusting a voltage regulator, and verifying tested electronic current transformers accessed at the intervals.
6. The field calibration system for the electronic current transformer is characterized by comprising the following components: the system comprises a standard current transformer, a current booster, a calibration device and a double-bus connection wire connected to an electronic current transformer to be tested; wherein,
in the double-bus connection, two adjacent three phases are respectively connected with a tested electronic current transformer, the two adjacent two-phase terminals (401) and (404) are respectively connected with the current booster and the standard current transformer, the other two phases at intervals are respectively connected with the terminal (402) and the terminal (403), and the terminal (405) and the terminal (406).
7. The field calibration system of an electronic current transformer according to claim 6, wherein the output optical fiber of the merging unit is connected with the input terminal of the checking device, and the time-setting terminal of the merging unit is connected with the synchronous signal output terminal of the checking device.
8. The field calibration system of an electronic current transformer according to claim 6, wherein the output optical fiber of the merging unit is connected to the input terminal of the checking device, and the time-tick terminal of the merging unit and the input terminal of the synchronization signal of the calibrating device are simultaneously connected to the time-tick signal of the whole station.
9. The electronic current transformer field verification system of claim 6, wherein the electronic current transformer verification system further comprises: a voltage regulator;
the output end of the voltage regulator is connected with the input end of the current booster.
10. An electronic current transformer field verification method, wherein the method is used for verifying an electronic current transformer to be tested by using the electronic current transformer verification system of claims 6-9, and the method comprises the following steps:
closing the disconnecting switches and the circuit breakers connected into the two intervals of the tested electronic current transformer and the bus-tie interval, communicating the two intervals with the two buses, and simultaneously disconnecting the disconnecting switches and the transformers of other outgoing line intervals;
connecting the tested electronic current transformer connected by the double buses in series into a checking circuit;
and connecting the merging units corresponding to the intervals with a verifying device, connecting test voltage, and adjusting the voltage regulator to verify the tested electronic current transformers accessed at the intervals.
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| CN109884568A (en) * | 2019-01-17 | 2019-06-14 | 国网浙江省电力有限公司金华供电公司 | A kind of intelligent substation main transformer sample-synchronous calibration equipment and test method |
| CN110346713A (en) * | 2019-07-30 | 2019-10-18 | 国网浙江省电力公司宁波供电公司 | A method of temperature rise test is completed at the same time for more 10kV on-pole switch primary connections |
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| CN108089144B (en) | 2020-01-24 |
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