CN106054101A - Live verification method of current transformer - Google Patents
Live verification method of current transformer Download PDFInfo
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- CN106054101A CN106054101A CN201610620126.8A CN201610620126A CN106054101A CN 106054101 A CN106054101 A CN 106054101A CN 201610620126 A CN201610620126 A CN 201610620126A CN 106054101 A CN106054101 A CN 106054101A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012795 verification Methods 0.000 title claims abstract description 34
- 239000004020 conductor Substances 0.000 claims abstract description 83
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000005672 electromagnetic field Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 238000009941 weaving Methods 0.000 claims description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides a live verification method of a current transformer. The method comprises a step of shielding the magnetic field generated by the current which goes through a primary side conductor in a current transformer to be detected, a step of introducing current into the current transformer to be detected, a step of detecting the real value of verification current, and a step of calculating the measurement error of the current transformer to be detected. Compared with the prior art, the live verification method and system of a current transformer provided by the invention have the advantages that the interference of a verification result by the current in the primary side conductor is eliminated by the shielding layer, the reliability of verification is improved, and the live detection of the current transformer to be detected is realized at the same time.
Description
Technical Field
The invention relates to the technical field of current transformer calibration, in particular to a live calibration method of a current transformer.
Background
The current in the lines of power generation, transformation, transmission, distribution and utilization is very different, from several amperes to several tens of thousands of amperes. In order to convert the current into a more uniform current for measurement, protection and control, the voltage on the line is generally higher, and direct measurement is very dangerous. The current transformer has the functions of current transformation and electrical isolation, and is a sensor for acquiring current information of an electrical primary loop by secondary equipment such as a measuring instrument and relay protection in an electric power system. At present, a comparison method is generally adopted for output verification of a current transformer, and specifically comprises the following steps: firstly, under the condition of power failure of equipment or offline, an experimental current is simultaneously output to primary side windings of a standard current transformer and a current transformer to be detected by using a current booster, and then a secondary side output value of the current transformer to be detected is compared with a secondary side output value of the standard current transformer to calculate an output error of the current transformer to be detected. However, this method can only be performed in a power failure or off-line state, and cannot perform live detection on the current transformer, and particularly cannot perform verification on the current transformer after live replacement.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a live calibration method of a current transformer.
The technical scheme of the invention is as follows:
the verification method comprises the following steps:
shielding an electromagnetic field generated by current flowing through a primary side conductor in a current transformer to be detected;
introducing a checking current to the current transformer to be detected;
and calculating the measurement error of the current transformer to be detected.
The invention further provides a preferable technical scheme that: the primary side conductor is arranged inside a sensitive coil of the current transformer to be detected;
the shielding of an electromagnetic field generated by a current flowing through a primary side conductor includes: embedding a shielding layer between the primary side conductor and the sensitive coil;
to waiting to examine current transformer and introducing check-up current includes: an auxiliary conductor is arranged between the shielding layer and the sensitive coil; a verification current is applied to the auxiliary conductor.
The invention further provides a preferable technical scheme that:
the shielding layer is an independent annular shielding layer; or,
the shielding layer includes a plurality of shields connected to each other or independent of each other. The invention further provides a preferable technical scheme that: the shielding layer is any one of a conductive magnetic shielding layer, a conductive non-conductive magnetic shielding layer, a magnetic conductive non-conductive shielding layer, a semiconductive semiconductor magnetic shielding layer, a semiconductive non-conductive magnetic shielding layer, a non-conductive semiconductor magnetic shielding layer and a conductive semiconductor magnetic shielding layer.
The invention further provides a preferable technical scheme that: the annular shielding layer and the shielding piece are both composed of a plurality of components;
the member is a tubular member or a sheet-like member;
the component is made of rigid material or flexible material;
the members are connected to each other by means of winding or weaving; alternatively, the members are connected to each other by means of a snap or flange.
The invention further provides a preferable technical scheme that:
the auxiliary conductor is an independent tubular conductor; or,
the conductors are mutually connected or independent, the conductors are uniformly or non-uniformly arranged, and the conductors are made of the same or different materials.
The invention further provides a preferable technical scheme that: the auxiliary conductor adopts any one of a cable, a lead and a flat cable.
Compared with the closest prior art, the invention has the beneficial effects that:
1. according to the live-line calibration method of the current transformer, the interference of the current in the primary side conductor on the calibration result is eliminated by the shielding layer, the reliability of calibration is improved, and meanwhile, the live-line detection of the current transformer to be tested is realized;
2. according to the live calibration method of the current transformer, the auxiliary conductor is used as a calibration current carrier, namely a primary side current carrier, and the calibration of measurement errors when the current transformer to be tested detects different primary side currents can be realized by selecting different types of cables;
3. according to the live-line calibration method of the current transformer, the shielding layer comprises various structures, can be an independent annular shielding layer, can be a plurality of mutually connected shielding pieces, and can also be a plurality of mutually independent shielding pieces, so that the requirements of the current transformer in different installation environments can be met;
4. according to the electrified checking method of the current transformer, the annular shielding layer and the shielding piece are both composed of a plurality of components, the components can be connected with each other in a winding or weaving mode, and can also be connected with each other through a buckle or a flange, so that the electrified checking method is simple and easy to operate;
5. according to the electrified checking method of the current transformer, the auxiliary conductor comprises various structures, can be an independent annular conductor and also can comprise a plurality of conductors, and the requirements of the current transformer in different installation environments can be met;
6. the live calibration method of the current transformer can carry out on-site calibration on the current transformer to be tested under the condition of no power failure, can realize remote transmission of calibration results, and is convenient for monitoring by a control center.
Drawings
FIG. 1: the implementation flow schematic diagram of the live calibration method of the current transformer in the embodiment of the invention is shown;
FIG. 2: the schematic diagram of the high-voltage switch current transformer embedded with the shielding layer and the auxiliary conductor in the embodiment of the invention;
FIG. 3: another schematic diagram of a high-voltage switch current transformer with an embedded shielding layer and an auxiliary conductor according to an embodiment of the invention;
FIG. 4 is a drawing: the embodiment of the invention provides a schematic diagram of an implementation system of an electrified checking method of a current transformer;
in the figure, 11: a primary side conductor of the high-voltage switch current transformer; 12: a sensitive coil of a high-voltage switch current transformer; 13: a shielding layer; 14: an auxiliary conductor; 21: a current transformer to be detected; 22: a standard current transformer; 23: a calibrator; 24: a voltage regulator; a 25 liter flow cell.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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 following describes a live verification method for a current transformer according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of an implementation of an electrified checking method for a current transformer in an embodiment of the present invention, and as shown in the figure, the electrified checking method for a current transformer to be checked in this embodiment specifically includes the following steps:
step S101: and shielding an electromagnetic field generated by current flowing through a primary side conductor in the current transformer to be detected.
The method for shielding the electromagnetic field in this embodiment is as follows:
and a shielding layer is embedded between the primary side conductor and the sensitive coil of the current transformer to be detected. Under the action of the electromagnetic shielding layer, the sensitive coil does not induce the current flowing through the primary side conductor in normal operation. The sensitive coil can be an optical fiber sensing head of the optical fiber current transformer, an air core coil of a Rogowski coil type transformer and a secondary winding of a core-through electronic optical fiber current transformer.
In this embodiment, the shielding layer is any one of a conductive magnetic shielding layer, a conductive non-conductive shielding layer, a semiconductive semiconductor magnetic shielding layer, a semiconductive electric magnetic shielding layer, a semiconductive non-conductive magnetic shielding layer, a nonconductive semiconductor magnetic shielding layer, and a conductive semiconductor magnetic shielding layer.
The shielding layer in this embodiment mainly includes two structures, specifically:
1. the shielding layer is an independent annular shielding layer. Wherein,
the annular shielding layer comprises a plurality of components, each of which is a tubular component or a sheet-shaped component, and the components can be connected with each other in a winding or weaving manner and also can be connected with each other through a buckle or a flange.
2. The shielding layer includes a plurality of shields. Wherein the plurality of shields may be interconnected or independent of each other.
The shield comprises a plurality of members, each of which is a tubular member or a sheet-like member, which may be connected to each other by winding or weaving, or may be connected to each other by a snap or a flange.
Step S102: and introducing a checking current to the current transformer to be checked.
The method for introducing the verification current in the embodiment comprises the following steps:
step S101 shows that when an electromagnetic field generated by a current flowing through a primary side conductor in a current transformer to be detected is shielded, a shielding layer is embedded between the primary side conductor and a sensitive coil in the current transformer to be detected, so that at least one auxiliary conductor can be arranged between the shielding layer and the sensitive coil by introducing a verification current, all the auxiliary conductors are also wrapped in the shielding layer, and the sensitive coil can only sense the current flowing through the auxiliary conductor. At this time, a verification current is applied to the auxiliary conductor, i.e., the verification current is introduced into the current transformer to be tested.
In this embodiment, the auxiliary conductor is any one of a cable, a lead wire and a flat cable.
The auxiliary conductor in this embodiment mainly includes two structures, specifically:
1. the auxiliary conductor is a separate annular conductor.
2. The auxiliary conductor includes a plurality of conductors. The plurality of conductors may be uniformly or non-uniformly arranged, the plurality of conductors may be connected to each other or may be independent of each other, and the plurality of conductors may be made of the same or different materials.
Fig. 2 is a schematic diagram of a high-voltage switch current transformer embedded with a shielding layer and an auxiliary conductor according to an embodiment of the present invention, as shown in the drawing, in this embodiment, a sensing coil 12 is outside a primary conductor 11, a shielding layer 13 is embedded between the primary conductor 11 and the sensing coil 12, and the sensing coil 12 is wrapped in the shielding layer 13, and under the effect of the shielding layer 13, the sensing coil 12 is not sensing current flowing through the primary side conductor 11 in normal operation. As shown in the figure, the shielding layer 13 is a separate annular shielding layer, and the auxiliary conductor is a separate annular conductor.
Fig. 3 is a schematic diagram of another high-voltage switching current transformer embedded with a shielding layer and an auxiliary conductor according to an embodiment of the present invention, as shown in the figure, in this embodiment, a sensing coil 12 is outside a primary conductor 11, a shielding layer 13 is embedded between the primary conductor 11 and the sensing coil 12, and an auxiliary conductor 14 is disposed between the shielding layer 13 and the sensing coil 12, and under the effect of the shielding layer 13, the sensing coil 12 does not sense a current flowing through the primary side conductor 11 in a normal operation, and only senses a verification current flowing through the auxiliary conductor 14. As shown in the figure, the shielding layer 13 in this embodiment is composed of eight shielding members, the auxiliary conductor includes four conductors, and the four conductors are mutually independent and unevenly distributed.
Step S103: and calculating the measurement error of the current transformer to be detected.
The actual value of the verification current can be detected in a variety of ways, two of which are described below.
(1) Direct detection method
In this embodiment, the current measuring instrument is used to directly detect the actual value of the verification current. And comparing the secondary side output value of the current transformer to be detected with the true value of the check current to obtain the ratio difference and the angle difference between the secondary side output value and the true value. And modifying the secondary side parameter of the current transformer to be detected according to the measurement error result, and modifying the measurement error.
(2) Indirect measurement method
As can be seen from steps S101 and S102, the electromagnetic field generated by the current of the primary side conductor is shielded by embedding a shielding layer between the primary side conductor and the sensitive coil in the current transformer to be checked, and the check current is introduced into the current transformer to be checked by arranging an auxiliary conductor between the shielding layer and the sensitive coil. Therefore, the auxiliary conductor can be connected to the primary side of the standard current transformer, and when the verification current is applied to the auxiliary conductor, the output value of the secondary side of the standard current transformer is the true value of the verification current.
The following describes an implementation system of a live verification method for a current transformer provided in an embodiment of the present invention by using an indirect measurement method, with reference to the accompanying drawings.
Fig. 4 is a schematic diagram of an implementation system of an electrified checking method for a current transformer in an embodiment of the present invention, and as shown in the figure, the electrified checking system for a current transformer in this embodiment includes a shielding layer 13, an auxiliary conductor 14, a current transformer 21 to be checked, a standard current transformer 22, a checker 23, a voltage regulator 24, and a current booster 25. Wherein,
the shielding layer 13 is embedded between the sensitive coil of the current transformer 21 to be tested and the primary side conductor, and the sensitive coil is wrapped in the shielding layer 13 and used for shielding an electromagnetic field generated by current flowing through the primary side conductor. In this embodiment, the shielding layer 13 eliminates interference of current in the primary side conductor on the verification result, improves the reliability of the verification, and simultaneously realizes live detection of the current transformer 21 to be detected.
The auxiliary conductor 14 is sequentially disposed between the shield layer 13 and the sensitive coil of the current transformer 21 to be inspected and wrapped in the shield layer 13, and the primary side of the standard current transformer 22 for transmitting the verification current. In this embodiment, the auxiliary conductor 14 is used as a checking current carrier, that is, a primary side current carrier, and different types of cables are selected, so that the checking of the measurement error when the current transformer 21 to be checked detects different primary side currents can be realized.
The secondary sides of the current transformer 21 to be detected and the standard current transformer 22 are both connected with a calibrator 23, which is used for calculating the measurement error of the current transformer 21 to be detected. In the embodiment, the actual value of the verification current is detected by adopting the standard current transformer 22, so that the verification precision of the system is improved. Meanwhile, two paths of signals of the current transformer 21 to be detected and the standard current transformer 22 are compared by adopting one calibrator 23, and the operation is simple and convenient.
The voltage regulator 24 is connected to a voltage source (AC380V) at one end and to the current booster 25 at the other end. The voltage regulator 24 is used to regulate the output current of the current booster 25. The current booster 25 is used to apply a verification current to the auxiliary conductor 14. In this embodiment, the voltage regulator 24 and the current booster 25 cooperate to adjust the magnitude of the calibration current applied to the auxiliary conductor 14, so as to calibrate the measurement error when the current transformer 21 to be calibrated detects different primary side currents.
The live calibration system of the current transformer in this embodiment further includes a merging unit MU and a communication unit GPS. The merging unit MU is connected to the optical fiber coupler SC of the current transformer 21 to be tested, the calibrator 23 and the communication unit GPS, and the communication unit GPS is also connected to the calibrator 23. Wherein,
and the merging unit MU is used for transmitting the secondary side output value of the current transformer 21 to be detected.
And the communication unit GPS is used for transmitting the measurement error result of the optical fiber six-transformer 21 to be detected in a long distance.
The live calibration system of the current transformer in the embodiment can carry out on-site calibration on the current transformer 21 to be detected under the condition of no power failure, and meanwhile, the remote transmission of a calibration result can be realized, so that the monitoring of a control center is facilitated.
It will be understood by those skilled in the art that all or part of the processes in the system implementing the embodiments described above can be implemented by the relevant hardware instructed by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An electrified checking method of a current transformer is characterized by comprising the following steps:
shielding an electromagnetic field generated by current flowing through a primary side conductor in a current transformer to be detected;
introducing a checking current to the current transformer to be detected;
and calculating the measurement error of the current transformer to be detected.
2. The live verification method of a current transformer according to claim 1, wherein the primary side conductor is disposed inside a sensitive coil of the current transformer to be tested;
the shielding of an electromagnetic field generated by a current flowing through a primary side conductor includes: embedding a shielding layer between the primary side conductor and the sensitive coil;
to waiting to examine current transformer and introducing check-up current includes: an auxiliary conductor is arranged between the shielding layer and the sensitive coil; a verification current is applied to the auxiliary conductor.
3. The live verification method of a current transformer according to claim 2, wherein said shield layer is a separate annular shield layer; or,
the shielding layer includes a plurality of shields connected to each other or independent of each other.
4. The method for performing live-wire verification on a current transformer according to claim 2, wherein the shielding layer is any one of a conductive magnetic shielding layer, a conductive non-conductive magnetic shielding layer, a semiconductive non-conductive magnetic shielding layer, a non-conductive semiconductive magnetic shielding layer and a conductive semiconductive magnetic shielding layer.
5. The live verification method of a current transformer according to claim 3, wherein the annular shield layer and the shield are each composed of a plurality of members;
the member is a tubular member or a sheet-like member;
the component is made of rigid material or flexible material;
the members are connected to each other by means of winding or weaving; alternatively, the members are connected to each other by means of a snap or flange.
6. The live verification method of a current transformer according to claim 2,
the auxiliary conductor is an independent tubular conductor; or,
the auxiliary conductor comprises a plurality of conductors;
the conductors are mutually connected or independent, the conductors are uniformly or non-uniformly arranged, and the conductors are made of the same or different materials.
7. The live verification method of a current transformer according to claim 2, wherein the auxiliary conductor is any one of a cable, a lead wire and a flat cable.
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| CN201610620126.8A CN106054101B (en) | 2016-07-29 | 2016-07-29 | Live calibration method of current transformer |
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Cited By (2)
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| CN113866702A (en) * | 2021-08-19 | 2021-12-31 | 中车唐山机车车辆有限公司 | Current transformer testing device |
| CN116381590A (en) * | 2023-06-07 | 2023-07-04 | 云南电网有限责任公司 | Current transformer electrified checking system, self-calibration method and use method |
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