CN113030832A - Device and method for detecting composite error of current transformer - Google Patents
Device and method for detecting composite error of current transformer Download PDFInfo
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- CN113030832A CN113030832A CN202110304936.3A CN202110304936A CN113030832A CN 113030832 A CN113030832 A CN 113030832A CN 202110304936 A CN202110304936 A CN 202110304936A CN 113030832 A CN113030832 A CN 113030832A
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- 239000002131 composite material Substances 0.000 title claims abstract description 45
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- 238000001514 detection method Methods 0.000 claims abstract description 158
- 238000004804 winding Methods 0.000 claims abstract description 64
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 230000000712 assembly Effects 0.000 claims abstract description 7
- 238000000429 assembly Methods 0.000 claims abstract description 7
- 230000005389 magnetism Effects 0.000 claims description 55
- 230000005347 demagnetization Effects 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
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- 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 invention discloses a current transformer composite error detection device and a method, wherein the device comprises: testing platform, loading board, primary winding power distributor, secondary winding detector and controlling means are equipped with the detection and lead to the groove on testing platform, are equipped with determine module on detecting to lead to the groove, and every determine module of group all includes: the power supply terminal and the detection terminal can stretch out and draw back; the bearing plate is connected with the detection through groove in a sliding mode, a transformer bearing unit is arranged on the bearing plate, each transformer bearing unit is used for bearing a current transformer to be detected, the primary winding power supply distributor is electrically connected with the power supply terminal of each group of detection assemblies respectively, the secondary winding detector is electrically connected with the detection terminal of each group of detection assemblies through an adjustable load respectively, and the control device is electrically connected with the primary winding power supply distributor and the secondary winding detector respectively. The invention can simultaneously carry out composite error detection on a plurality of current transformers, thereby saving time and labor.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a device and a method for detecting a composite error of a current transformer.
Background
In an electric power system, a current transformer is an essential element of a measuring and protecting device.
The current transformer is mainly used for converting a large current in an alternating current circuit into a small current (generally 5A or 1A) with a certain proportion for monitoring, measuring and relay protection. In the power generation, power transformation, power transmission and power distribution processes, due to the difference of electric equipment and power utilization requirements, current is usually from dozens of amperes to tens of thousands of amperes, and the circuit can be accompanied by high voltage, short circuit and other conditions, and the current transformer can monitor and measure the circuits, solves the dangers brought by high voltage and high current, and plays a very important role in maintaining the safety, stability and accurate measurement of an electric power system.
Before each transformer leaves a factory, error detection is needed to be carried out so as to judge that the requirement of accurate level is met, the existing current transformers need to carry out compound error detection one by one, time and labor are consumed, and the detection accuracy is low.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for detecting the composite error of a current transformer, which can detect the composite error of a plurality of current transformers simultaneously and save time and labor.
In order to achieve the purpose, the technical scheme of the invention is as follows:
on one hand, the invention discloses a current transformer composite error detection device, which comprises:
testing platform is equipped with on testing platform and detects logical groove, is detecting to be equipped with at least two sets of determine module on leading to the groove, and every set of determine module all includes: the power supply terminal is arranged on one side surface of the detection through groove, the detection terminal is arranged on the other side surface of the detection through groove, and the power supply terminal and the detection terminal can stretch out and draw back;
the bearing plate is connected with the detection through groove in a sliding mode, at least two mutual inductor bearing units are arranged on the bearing plate, and each mutual inductor bearing unit is used for bearing one current mutual inductor to be detected;
the primary winding power distributor is electrically connected with the power terminals of each group of detection assemblies respectively and is used for providing current for the primary winding side of the current transformer;
the secondary winding detector is electrically connected with the detection terminal of each group of detection components through an adjustable load and is used for detecting the current on the secondary winding side of the current transformer;
and the control device is respectively and electrically connected with the primary winding power distributor and the secondary winding detector and is used for controlling the primary winding power distributor and the secondary winding detector to work.
The invention discloses a current transformer composite error detection device which can be used for rapidly and effectively detecting composite errors of a plurality of current transformers, is good in detection efficiency and high in detection precision, and greatly saves labor cost.
On the basis of the technical scheme, the following improvements can be made:
preferably, on the bearing plate, two adjacent transformer bearing units are isolated by an electromagnetic shielding device.
By adopting the preferable scheme, the phenomenon that the current transformers in detection interfere with each other is prevented.
As a preferred scheme, the sliding ends on the two sides of the bearing plate are respectively in sliding connection with the grooves on the two sides of the detection through groove;
or the sliding end of the bottom of the bearing plate is in sliding connection with the guide rail on the plane of the detection through groove.
The above preferred embodiments are selected according to the specific situation. The bearing plate is in transmission connection with the bearing plate driving device, and the bearing plate driving device drives the bearing plate and the detection through groove to move relatively.
As a preferred scheme, the composite error detection device of the current transformer further comprises a demagnetizing device, the demagnetizing device is electrically connected with the power supply terminal of each detection assembly respectively, the demagnetizing device is electrically connected with the control device, and the control device controls the work of the demagnetizing device;
the detection assembly further comprises: and the residual magnetism detection body is arranged on the plane of the detection through groove and can be lifted, and is used for detecting the residual magnetism in the current transformer.
By adopting the preferable scheme, the demagnetization operation is carried out before each detection, and the detection accuracy is ensured.
As the preferred scheme, the mutual inductor bearing unit is a bearing table shaped like a Chinese character 'hui', and a hole for lifting the residual magnetism detection body is formed in the middle of the bearing table.
By adopting the preferable scheme, the residual magnetism is detected while the bearing of the current transformer is not influenced.
As an optimal scheme, a transformer identification device is arranged on each transformer bearing unit and used for identifying the identity code on the current transformer to be detected, and the transformer identification devices are in communication connection with the control device.
By adopting the preferable scheme, the identity code of the current transformer is identified, so that the later-stage tracing is facilitated.
Preferably, each mutual inductor bearing unit is provided with a residual magnetism detection body recognition device for recognizing a position code on a residual magnetism detection body, and the residual magnetism detection body recognition device is in communication connection with the control device.
By adopting the preferable scheme, the relative positions of the residual magnetism detection body, the power supply terminal and the detection terminal are fixed, so that the residual magnetism detection body, the power supply terminal and the detection terminal represent the same group of detection components, the position code on the residual magnetism detection body and the identity code on the current transformer have uniqueness, and each code is different, thereby facilitating the follow-up tracing of the current transformer.
On the other hand, the invention also discloses a composite error detection method of the current transformer, which utilizes any one of the composite error detection devices of the current transformer to detect and specifically comprises the following steps:
placing a current transformer to be detected on a transformer bearing unit on a bearing plate;
the bearing plate moves to a corresponding station on the detection through groove;
the control device controls the power supply terminal and the detection terminal of the detection assembly to extend out and is respectively and electrically connected with the primary winding terminal and the secondary winding terminal of the current transformer to be detected;
the control device controls the primary winding power distributor to distribute corresponding current, the secondary winding detector collects the current of a secondary winding terminal of the current transformer, and the control device performs secondary analysis and judgment on the collected current of the secondary winding terminal to obtain primary judgment of the current transformer;
the control device controls the primary winding power distributor to be closed, and the power terminal and the detection terminal of the detection assembly retract;
and repeatedly detecting the current transformer for many times, and comprehensively judging by the control device.
The invention discloses a method for detecting composite errors of current transformers, which can be used for quickly and effectively detecting the composite errors of a plurality of current transformers, has good detection efficiency and high detection precision, and greatly saves the labor cost.
As a preferred scheme, before each detection operation, a demagnetization step is further included, specifically including the following steps:
the control device controls the power supply terminal and the detection terminal of the detection assembly to extend out and is respectively and electrically connected with the primary winding terminal and the secondary winding terminal of the current transformer to be demagnetized;
increasing the load capacity of the adjustable load;
the control device controls the demagnetization device to perform demagnetization on the current transformer, after each demagnetization process is finished, the control device controls the residual magnetism detection body to stretch out, detects the residual magnetism in the current transformer until the residual magnetism is zero, and the detection result of the residual magnetism detection body is sent to the control device every time.
By adopting the preferable scheme, the accuracy of the composite error detection of the current transformer at each time is ensured.
Preferably, before the first detection operation, the method further comprises: the identity binding step specifically comprises the following steps:
the mutual inductor identification device identifies the identity code on the current mutual inductor to be detected and sends the identity code to the control device;
the residual magnetism detection body recognition device recognizes the position code on the residual magnetism detection body and sends the position code to the control device;
the control device binds the identity code with the corresponding location code.
By adopting the preferable scheme, the relative positions of the residual magnetism detection body, the power supply terminal and the detection terminal are fixed, so that the residual magnetism detection body, the power supply terminal and the detection terminal represent the same group of detection components, the position code on the residual magnetism detection body and the identity code on the current transformer have uniqueness, and each code is different, thereby facilitating the follow-up tracing of the current transformer.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a top view of a composite error detection apparatus (with a guide rail) for a current transformer according to an embodiment of the present invention.
Fig. 2 is a top view of the composite error detecting apparatus of the current transformer shown in fig. 1 when the carrier plate moves a certain distance.
Fig. 3 is a top view of a composite error detection apparatus (without a guide rail) for a current transformer according to an embodiment of the present invention.
FIG. 4 is a top view of the composite error detecting apparatus of the current transformer shown in FIG. 3 when the carrier plate moves a certain distance.
Fig. 5 is a top view of a composite error detection device (with a guide rail and a demagnetizing device) for a current transformer according to an embodiment of the present invention.
Wherein: 1-detection platform, 11-detection through groove, 12-detection assembly, 121-power supply terminal, 122-detection terminal, 123-residual magnetism detection body, 2-bearing plate, 21-bearing platform, 22-hole, 23-sliding end, 3-primary winding power supply distributor, 4-secondary winding detector, 5-adjustable load, 6-guide rail, 7-bearing plate driving device and 8-demagnetizing device.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
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 expression "comprising" an element is an "open" expression which merely means that there are corresponding parts, which should not be interpreted as excluding additional parts.
In order to achieve the object of the present invention, in some embodiments of a composite error detection apparatus and method for a current transformer, as shown in fig. 1-2, the composite error detection apparatus for a current transformer includes:
the bearing plate 2 is connected with the detection through groove 11 in a sliding mode, at least two mutual inductor bearing units are arranged on the bearing plate 2, and each mutual inductor bearing unit is used for bearing one current mutual inductor to be detected;
the primary winding power distributor 3 is electrically connected with the power terminals 121 of each group of detection assemblies 12 respectively and is used for providing current for the primary winding side of the current transformer;
the secondary winding detector 4 is electrically connected with the detection terminal 122 of each group of detection components 12 through an adjustable load 5, and is used for detecting the current on the secondary winding side of the current transformer;
and the control device (not shown in the figure) is electrically connected with the primary winding power distributor 3 and the secondary winding detector 4 respectively and is used for controlling the primary winding power distributor 3 and the secondary winding detector 4 to work.
The invention discloses a current transformer composite error detection device which can be used for rapidly and effectively detecting composite errors of a plurality of current transformers, is good in detection efficiency and high in detection precision, and greatly saves labor cost.
Meanwhile, the control device can record and store the detection state of each current transformer and the detection result, so that the later-stage tracing is facilitated.
In some embodiments, one transformer carrying unit corresponds to one detection assembly 12, and the plurality of groups of detection assemblies 12 are uniformly distributed on the detection through slot 11.
In order to further optimize the implementation effect of the present invention, in other embodiments, the rest features are the same, except that on the carrying plate 2, two adjacent transformer carrying units are isolated by an electromagnetic shielding device (not shown in the figure).
By adopting the preferable scheme, the phenomenon that the current transformers in detection interfere with each other is prevented.
In order to further optimize the effect of the present invention, as shown in fig. 3-4, in other embodiments, the rest features are the same, except that the sliding ends 22 at both sides of the loading plate 2 are slidably connected with the grooves (not shown) at both sides of the detecting through groove 11.
The above preferred embodiments are selected according to the specific situation. The bearing plate 2 is in transmission connection with a bearing plate driving device 7, and the bearing plate driving device 7 drives the bearing plate 2 and the detection through groove 11 to move relatively.
As shown in fig. 1-2, in order to further optimize the working effect of the present invention, in other embodiments, the rest features are the same, except that the sliding end (not shown) of the bottom of the loading plate 2 is slidably connected with the guide rail 6 on the plane of the detection through slot 11.
The above preferred embodiments are selected according to the specific situation. The bearing plate 2 is in transmission connection with a bearing plate driving device 7, and the bearing plate driving device 7 drives the bearing plate 2 and the detection through groove 11 to move relatively.
As shown in fig. 5, in order to further optimize the implementation effect of the present invention, in other embodiments, the other features are the same, except that the composite error detection device of the current transformer further includes a demagnetization device 8, the demagnetization device 8 is electrically connected to the power terminal 121 of each detection component 12, the demagnetization device 8 is electrically connected to the control device, and the control device controls the demagnetization device 8 to operate;
the detection assembly 12 further comprises: and the residual magnetism detecting body 123 is arranged on the plane of the detection through groove 11 and can lift up and down, and the residual magnetism detecting body 123 is used for detecting the residual magnetism in the current transformer.
By adopting the preferable scheme, the demagnetization operation is carried out before each detection, and the detection accuracy is ensured.
Further, in the above embodiment, the transformer mounting unit is a "return" shaped mounting base 21, and a hole 22 for lifting the residual magnetism detecting body 123 is provided in the middle of the mounting base 21.
By adopting the preferable scheme, the residual magnetism is detected while the bearing of the current transformer is not influenced. The residual magnetism detecting body 123 extends into the central hole part of the iron core of the current transformer to detect the residual magnetism.
Further, on the basis of the above embodiment, each transformer bearing unit is provided with a transformer identification device for identifying an identity code on the current transformer to be detected, and the transformer identification device is in communication connection with the control device.
By adopting the preferable scheme, the identity code of the current transformer is identified, so that the later-stage tracing is facilitated.
Further, on the basis of the above embodiment, each of the transformer carrying units is provided with a residual magnetism detecting body recognition device for recognizing the position code on the residual magnetism detecting body 123, and the residual magnetism detecting body recognition device is in communication connection with the control device.
By adopting the above preferred scheme, because the relative positions of the residual magnetism detecting body 123, the power terminal 121 and the detecting terminal 122 are fixed, the residual magnetism detecting body 123, the power terminal 121 and the detecting terminal 122 represent the same group of detecting components 12, the position code on the residual magnetism detecting body 123 and the identity code on the current transformer have uniqueness, and each code is different, thereby facilitating the follow-up tracing of the current transformer.
In a specific embodiment, the residual magnetism detecting body identification device may be the same identification device as the mutual inductor identification device, or may be two identification devices independent of each other.
The various embodiments above may be implemented in cross-parallel.
On the other hand, the invention also discloses a composite error detection method of the current transformer, which utilizes any one of the composite error detection devices of the current transformer to detect and specifically comprises the following steps:
placing a current transformer to be detected on a transformer bearing unit on the bearing plate 2;
the bearing plate 2 moves to a corresponding station on the detection through groove 11;
the control device controls the power supply terminal 121 and the detection terminal 122 of the detection component 12 to extend out and be electrically connected with the primary winding terminal and the secondary winding terminal of the current transformer to be detected respectively;
the control device controls the primary winding power distributor 3 to distribute corresponding current, the secondary winding detector 4 collects the current of the secondary winding terminal of the current transformer, and the control device performs secondary analysis and judgment on the collected current of the secondary winding terminal to obtain primary judgment of the current transformer;
the control device controls the primary winding power distributor 3 to be closed, and the power terminal 121 and the detection terminal 122 of the detection assembly 12 retract;
and repeatedly detecting the current transformer for many times, and comprehensively judging by the control device.
The invention discloses a method for detecting composite errors of current transformers, which can be used for quickly and effectively detecting the composite errors of a plurality of current transformers, has good detection efficiency and high detection precision, and greatly saves the labor cost.
In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that a demagnetization step is further included before each detection operation, specifically including the following steps:
the control device controls the power supply terminal 121 and the detection terminal 122 of the detection component 12 to extend out and be electrically connected with the primary winding terminal and the secondary winding terminal of the current transformer to be demagnetized respectively;
increasing the load capacity of the adjustable load 5;
the control device controls the demagnetization device 8 to perform demagnetization on the current transformer, after each demagnetization process is finished, the control device controls the residual magnetism detection body 123 to extend out, detects the residual magnetism in the current transformer until the residual magnetism is zero, and the detection result of the residual magnetism detection body 123 is sent to the control device every time.
By adopting the preferable scheme, the accuracy of the composite error detection of the current transformer at each time is ensured.
In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that before the first detection operation, the method further includes: the identity binding step specifically comprises the following steps:
the mutual inductor identification device identifies the identity code on the current mutual inductor to be detected and sends the identity code to the control device;
the residual magnetism detection body recognition device recognizes the position code on the residual magnetism detection body 123 and sends the position code to the control device;
the control device binds the identity code with the corresponding location code.
By adopting the above preferred scheme, because the relative positions of the residual magnetism detecting body 123, the power terminal 121 and the detecting terminal 122 are fixed, the residual magnetism detecting body 123, the power terminal 121 and the detecting terminal 122 represent the same group of detecting components 12, the position code on the residual magnetism detecting body 123 and the identity code on the current transformer have uniqueness, and each code is different, thereby facilitating the follow-up tracing of the current transformer.
Meanwhile, the current transformer composite error detection device has an identity binding function, and the current transformer can be placed on the transformer bearing unit at any position at will.
The invention discloses a device and a method for detecting composite errors of a current transformer.A control device controls a primary winding power supply distributor 3 to distribute proper current, and a secondary winding detector 4 can detect the corresponding current in real time. Furthermore, the control device may implement that the primary winding power distributor 3 detects the change of the current by the secondary winding detector 4 under different currents. Or, after adopting different demagnetization methods, the secondary winding detector 4 detects the change condition of the current.
The device disclosed by the invention can form different detection schemes according to specific situations, and the control device has the kinetic energy for automatically recording and analyzing and binding identities, so that the current transformers in the same batch or different batches can be subjected to analysis of transverse or longitudinal compound errors.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (10)
1. Current transformer composite error detection device, its characterized in that includes:
testing platform is equipped with on the testing platform and detects logical groove it is equipped with at least two sets of determine module, every group to detect logical groove determine module all includes: the power supply terminal is arranged on one side surface of the detection through groove, and the detection terminal is arranged on the other side surface of the detection through groove, wherein the power supply terminal and the detection terminal can extend and retract;
the bearing plate is connected with the detection through groove in a sliding mode, at least two mutual inductor bearing units are arranged on the bearing plate, and each mutual inductor bearing unit is used for bearing one current mutual inductor to be detected;
the primary winding power distributor is electrically connected with the power terminal of each group of detection assemblies respectively and is used for providing current for the primary winding side of the current transformer;
the secondary winding detector is electrically connected with the detection terminal of each group of detection assemblies through an adjustable load and is used for detecting the current on the secondary winding side of the current transformer;
and the control device is respectively and electrically connected with the primary winding power distributor and the secondary winding detector and is used for controlling the primary winding power distributor and the secondary winding detector to work.
2. The composite error detecting device of claim 1, wherein two adjacent transformer carrying units are isolated from each other by an electromagnetic shielding device on the carrying plate.
3. The composite error detection device of the current transformer according to claim 1, wherein the sliding ends of the two sides of the loading plate are respectively connected with the grooves of the two sides of the detection through groove in a sliding manner;
or the sliding end of the bottom of the bearing plate is in sliding connection with the guide rail on the plane of the detection through groove.
4. The composite error detecting device of the current transformer according to any one of claims 1-3, wherein the composite error detecting device further comprises a demagnetizing device, the demagnetizing device is electrically connected to the power supply terminal of each set of the detecting elements, the demagnetizing device is electrically connected to a control device, and the control device controls the demagnetizing device to operate;
the detection assembly further comprises: and the residual magnetism detection body is arranged on the plane of the detection through groove and can lift, and is used for detecting the residual magnetism in the current transformer.
5. The composite error detection device of the current transformer according to claim 4, wherein the transformer bearing unit is a bearing table shaped like a Chinese character 'hui', and a hole for lifting a residual magnetism detection body is arranged in the middle of the bearing table.
6. The current transformer composite error detection device according to claim 5, wherein each transformer bearing unit is provided with a transformer identification device for identifying an identity code on the current transformer to be detected, and the transformer identification device is in communication connection with the control device.
7. The composite error detecting device of current transformer according to claim 6, wherein each of said transformer carrying units is provided with a residual magnetism detecting body recognition device for recognizing a position code on said residual magnetism detecting body, said residual magnetism detecting body recognition device being in communication connection with said control device.
8. The method for detecting the composite error of the current transformer is characterized by being detected by using the composite error detecting device of the current transformer as claimed in any one of claims 1 to 7, and specifically comprising the following steps of:
placing a current transformer to be detected on a transformer bearing unit on a bearing plate;
the bearing plate moves to a corresponding station on the detection through groove;
the control device controls the power supply terminal and the detection terminal of the detection assembly to extend out and is respectively and electrically connected with the primary winding terminal and the secondary winding terminal of the current transformer to be detected;
the control device controls the primary winding power distributor to distribute corresponding current, the secondary winding detector collects the current of a secondary winding terminal of the current transformer, and the control device performs secondary analysis and judgment on the collected current of the secondary winding terminal to obtain primary judgment of the current transformer;
the control device controls the primary winding power distributor to be closed, and the power terminal and the detection terminal of the detection assembly retract;
and repeatedly detecting the current transformer for many times, and comprehensively judging by the control device.
9. The method for detecting the composite error of the current transformer according to claim 8, wherein a demagnetization step is further included before each detection operation, and specifically includes the following steps:
the control device controls the power supply terminal and the detection terminal of the detection assembly to extend out and is respectively and electrically connected with the primary winding terminal and the secondary winding terminal of the current transformer to be demagnetized;
increasing the load capacity of the adjustable load;
the control device controls the demagnetization device to perform demagnetization on the current transformer, after each demagnetization process is finished, the control device controls the residual magnetism detection body to stretch out, detects the residual magnetism in the current transformer until the residual magnetism is zero, and the detection result of the residual magnetism detection body is sent to the control device every time.
10. The current transformer composite error detection method of claim 9, further comprising, prior to the first sensing operation: the identity binding step specifically comprises the following steps:
the mutual inductor identification device identifies the identity code on the current mutual inductor to be detected and sends the identity code to the control device;
the residual magnetism detection body recognition device recognizes the position code on the residual magnetism detection body and sends the position code to the control device;
the control device binds the identity code with the corresponding location code.
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| CN202110304936.3A CN113030832A (en) | 2021-03-22 | 2021-03-22 | Device and method for detecting composite error of current transformer |
| PCT/CN2021/112865 WO2022198896A1 (en) | 2021-03-22 | 2021-08-16 | Current transformer composite error testing apparatus and method |
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| CN202110304936.3A CN113030832A (en) | 2021-03-22 | 2021-03-22 | Device and method for detecting composite error of current transformer |
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Cited By (1)
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| WO2022198896A1 (en) * | 2021-03-22 | 2022-09-29 | 苏州电器科学研究院股份有限公司 | Current transformer composite error testing apparatus and method |
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| CN117233687B (en) * | 2023-11-13 | 2024-02-06 | 威胜集团有限公司 | CVT initial error assessment method, medium and terminal based on historical data |
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| WO2022198896A1 (en) | 2022-09-29 |
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