WO2022198896A1

WO2022198896A1 - Current transformer composite error testing apparatus and method

Info

Publication number: WO2022198896A1
Application number: PCT/CN2021/112865
Authority: WO
Inventors: 胡德霖; 胡醇; 白文波; 赵杰; 张峰; 何中原; 王浩; 李敏; 杨燕; 沈建锋; 徐志刚
Original assignee: 苏州电器科学研究院股份有限公司
Priority date: 2021-03-22
Filing date: 2021-08-16
Publication date: 2022-09-29
Also published as: CN113030832A

Abstract

A current transformer composite error testing apparatus, comprising: a testing platform (1), a testing groove (11) disposed on the testing platform (1), and at least two testing assemblies (12) disposed on the testing groove (11), each testing assembly (12) comprising: a power terminal (121) arranged at one side of the testing groove (11) and a testing terminal (122) arranged at the opposite side of the testing groove (11), the power terminal (121) and the testing terminal (122) both being telescopic; a bearing plate (2) slidably connected to the testing groove (11), and at least two transformer bearing units disposed on the bearing plate (2), each transformer bearing unit being used for bearing a current transformer to be tested; a primary winding power allocator (3) electrically connected to the power terminal (121) of each testing assembly (12) separately and used for providing current to the primary winding side of the current transformers; a secondary winding tester (4) electrically connected to the testing terminal (122) of each testing assembly (12) separately by means of an adjustable load (5) and used for testing the current at the secondary winding side of the current transformers; and a control apparatus electrically connected to the primary winding power allocator (3) and the secondary winding tester (4) separately and used for controlling the operation of the primary winding power allocator (3) and the secondary winding tester (4).

Description

Device and method for detecting composite error of current transformer

technical field

The invention belongs to the technical field of electric power systems, and in particular relates to a current transformer composite error detection device and method.

Background technique

In power systems, current transformers are essential components of measurement and protection devices.

The principle of the current transformer is based on the principle of electromagnetic induction. The current transformer is mainly used to convert the large current in the AC circuit into a certain proportion of small current (usually 5A or 1A) for monitoring, measurement and relay protection. use. In the process of power generation, transformation, transmission and distribution, due to the difference in electrical equipment and electricity demand, the current often ranges from tens of amps to tens of thousands of amps, and the circuit may be accompanied by high voltage, short circuit, etc. Current transformers can monitor and measure these circuits, and at the same time solve the dangers caused by high voltage and high current, which play a pivotal role in maintaining the safety, stability and accurate measurement of power systems.

Before leaving the factory, each transformer must undergo error detection to determine whether it meets the requirements of the accuracy level. The existing current transformers need to perform compound error detection one by one, which is time-consuming and labor-intensive, and the detection accuracy is low.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention proposes a current transformer composite error detection device and method, which can simultaneously perform composite error detection on multiple current transformers, saving time and effort.

In order to achieve the above object, technical scheme of the present invention is as follows:

In one aspect, the present invention discloses a current transformer composite error detection device, comprising:

The detection platform is provided with a detection through slot, and at least two sets of detection components are arranged on the detection through slot, and each set of detection components includes: a power terminal arranged on one side of the detection through slot and a power terminal arranged on the opposite side of the detection through slot. The detection terminal on the other side, the power terminal and the detection terminal can be stretched;

The carrier plate is slidably connected with the detection through slot, and at least two transformer bearing units are arranged on the bearing plate, and each transformer bearing unit is used to carry one current transformer to be detected;

The primary winding power distributor, which is electrically connected to the power terminals of each group of detection components respectively, is used to provide current for the primary winding side of the current transformer;

The secondary winding detector is electrically connected to the detection terminals of each group of detection components through adjustable loads respectively, and is used to detect the current on the secondary winding side of the current transformer;

The control device is electrically connected with the primary winding power distributor and the secondary winding detector respectively, and is used for controlling the operation of the primary winding power distributor and the secondary winding detector.

The invention discloses a current transformer composite error detection device, which can quickly and effectively detect the composite error of a plurality of current transformers, has good detection efficiency, high detection accuracy, and greatly saves labor costs.

On the basis of the above technical solutions, the following improvements can be made:

As a preferred solution, on the carrier board, two adjacent transformer carrier units are isolated by an electromagnetic shielding device.

By adopting the above preferred solution, the phenomenon of mutual interference of the current transformers in the detection is prevented.

As a preferred solution, the sliding ends on both sides of the carrier plate are respectively slidably connected to the grooves on both sides of the detection through groove;

Or, the sliding end of the bottom of the carrier plate is slidably connected with the guide rail on the plane of the detection through groove.

The above preferred solution is adopted, and the selection is made according to the specific situation. The bearing plate is connected with the bearing plate driving device in a driving manner, and the bearing plate driving device drives the bearing plate and the detection through groove to move relative to each other.

As a preferred solution, the current transformer composite error detection device further includes a demagnetization device, the demagnetization device is respectively electrically connected to the power terminal of each detection component, the demagnetization device is electrically connected to the control device, and the control device controls the demagnetization device to work;

The detection assembly further includes: a residual magnetism detection body arranged on the plane of the detection through slot and capable of lifting and lowering, and the residual magnetism detection body is used for detecting the residual magnetism in the current transformer.

With the above preferred solution, before each detection, a demagnetization operation is performed to ensure the detection accuracy.

As a preferred solution, the transformer bearing unit is a "return"-shaped bearing platform, and a hole for lifting and lowering the residual magnetism detector is provided in the middle of the bearing platform.

With the above preferred solution, the residual magnetism is detected without affecting the load on the current transformer.

As a preferred solution, each transformer carrying unit is provided with a transformer identification device for identifying the identity code on the current transformer to be detected, and the transformer identification device is connected in communication with the control device.

With the above preferred solution, the identity code of the current transformer is identified, which is convenient for later traceability.

As a preferred solution, each transformer carrying unit is provided with a residual magnetic detection body identification device for identifying the position code on the residual magnetic detection body, and the residual magnetic detection body identification device is communicatively connected to the control device.

With the above preferred solution, since the relative positions of the residual magnetism detector, the power supply terminal and the detection terminal are fixed, the residual magnetism detector, the power supply terminal and the detection terminal represent the same group of detection components. Both the code and the identity code on the current transformer are unique, and each code is different, which is convenient for subsequent traceability of the current transformer.

On the other hand, the present invention also discloses a current transformer composite error detection method, which utilizes any of the above-mentioned current transformer composite error detection devices for detection, and specifically includes the following steps:

Place the current transformer to be detected on the transformer carrier unit on the carrier board;

The carrier plate moves to the corresponding station on the detection channel;

The control device controls the power supply terminal and the detection terminal of the detection component to extend, and are respectively electrically connected to 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 the corresponding current, the secondary winding detector 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 the current transformer preliminary judgment;

The control device controls the primary winding power distributor to be closed, and the power terminals and the detection terminals of the detection components are retracted;

Repeat the detection of the current transformer for many times, and the control device makes a comprehensive judgment.

The invention discloses a composite error detection method of a current transformer, which can quickly and effectively detect the composite error of a plurality of current transformers, has good detection efficiency, high detection accuracy, and greatly saves labor costs.

As a preferred solution, a demagnetization step is also included before each detection operation, which specifically includes the following contents:

The control device controls the power supply terminal and the detection terminal of the detection component to extend, and are respectively electrically connected to the primary winding terminal and the secondary winding terminal of the current transformer to be demagnetized;

Increase the load of the adjustable load;

The control device controls the demagnetization device to demagnetize the current transformer. After each demagnetization process, the control device controls the remanence detection body to extend, and detects the remanence in the current transformer until it is zero, and each time the residual magnetism is detected. The detection results of the magnetic detector are all sent to the control device.

The above preferred solution is adopted to ensure the accuracy of each current transformer composite error detection.

As a preferred solution, before the first detection operation, it also includes: an identity binding step, which specifically includes the following content:

The transformer identification device identifies the identity code on the current transformer to be detected, and sends it to the control device;

The remanence detector identification device identifies the position code on the remanence detector and sends it to the control device;

The control device binds the identity code with the corresponding location code.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a top view of a current transformer composite error detection device (with a guide rail) provided by an embodiment of the present invention.

FIG. 2 is a top view when the carrier plate moves a certain distance in the current transformer composite error detection device shown in FIG. 1 .

3 is a top view of a current transformer composite error detection device (without a guide rail) provided by an embodiment of the present invention.

FIG. 4 is a top view when the carrier plate moves a certain distance in the current transformer composite error detection device shown in FIG. 3 .

FIG. 5 is a top view of a current transformer composite error detection device (with a guide rail and a demagnetization device) provided by an embodiment of the present invention.

Among them: 1-detection platform, 11-detection through slot, 12-detection component, 121-power terminal, 122-detection terminal, 123-remanence detector, 2-carrying plate, 21-carrying platform, 22-hole, 23 -Sliding end, 3-Primary winding power distributor, 4-Secondary winding detector, 5-Adjustable load, 6-Guide rail, 7-Load plate drive device, 8-Demagnetization device.

Detailed ways

The 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The expression "comprising" an element is an "open-ended" expression, which merely refers to the presence of corresponding components and should not be interpreted as excluding additional components.

In order to achieve the purpose of the present invention, in some embodiments of the current transformer composite error detection device and method, as shown in Figures 1-2, the current transformer composite error detection device includes:

The detection platform 1 is provided with a detection through slot 11 on the detection platform 1, and at least two sets of detection assemblies 12 are arranged on the detection through slot 11, and each set of detection assemblies 12 includes: a power supply terminal disposed on one side of the detection through slot 11 121 and the detection terminal 122 disposed on the opposite side of the detection through slot 11, the power terminal 121 and the detection terminal 122 can be extended and retracted;

The carrier plate 2 is slidably connected with the detection through slot 11, and at least two transformer bearing units are arranged on the bearing plate 2, and each transformer bearing unit is used to carry a current transformer to be detected;

The primary winding power distributor 3 is electrically connected to the power terminals 121 of each group of detection components 12, respectively, and is used to provide current for the primary winding side of the current transformer;

The secondary winding detector 4 is electrically connected to the detection terminals 122 of each group of detection components 12 through the adjustable load 5 respectively, and is used for detecting the current on the secondary winding side of the current transformer;

The control device (not shown in the figure) is electrically connected to the primary winding power distributor 3 and the secondary winding detector 4 respectively, and is used to control the operation of the primary winding power distributor 3 and the secondary winding detector 4 .

At the same time, the control device can record and save the detection status and detection results of each current transformer, which is convenient for later traceability.

In some specific embodiments, one transformer carrying unit corresponds to one detection component 12 , and multiple sets of detection components 12 are evenly distributed on the detection through slot 11 .

In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features and techniques are the same, except that, on the carrier board 2, an electromagnetic shielding device is passed between two adjacent transformer carrier units (Fig. not shown) isolation.

As shown in FIGS. 3-4 , in order to further optimize the implementation effect of the present invention, in other embodiments, other features and techniques are the same, except that the sliding ends 22 on both sides of the carrier plate 2 are respectively connected to the detection through grooves 11 . The grooves (not shown in the figure) on both sides are slidably connected.

The above preferred solution is adopted, and the selection is made according to the specific situation. The carrier board 2 is connected with the carrier board driving device 7 in a transmission manner, and the carrier board driving device 7 drives the carrier board 2 to move relative to the detection through slot 11 .

As shown in Figures 1-2, in order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features and techniques are the same, except that the sliding end of the bottom of the carrier plate 2 (not shown in the figure) It is slidingly connected with the guide rail 6 on the plane of the detection through slot 11 .

As shown in FIG. 5 , in order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features and techniques are the same, the difference is that the current transformer composite error detection device further includes a demagnetization device 8, and the demagnetization devices 8 are respectively is electrically connected to the power terminal 121 of each detection assembly 12, the demagnetization device 8 is electrically connected to the control device, and the control device controls the demagnetization device 8 to work;

The detection assembly 12 further includes: a residual magnetism detection body 123 disposed on the plane of the detection through slot 11 and capable of lifting and lowering, and the residual magnetism detection body 123 is used to detect the residual magnetism in the current transformer.

Further, on the basis of the above-mentioned embodiment, the transformer bearing unit is a "back"-shaped bearing platform 21 , and a hole 22 for lifting and lowering the residual magnetism detector 123 is provided in the middle of the bearing platform 21 .

With the above preferred solution, the residual magnetism is detected without affecting the load on the current transformer. The residual magnetism detector 123 extends into the central hole portion of the iron core of the current transformer to detect residual magnetism.

Further, on the basis of the above-mentioned embodiment, each transformer carrying unit is provided with a transformer identification device for identifying the identity code on the current transformer to be detected, and the transformer identification device is communicated with the control device.

Further, on the basis of the above-mentioned embodiment, each transformer carrying unit is provided with a residual magnetism detection body identification device, which is used to identify the position code on the residual magnetism detection body 123, and the residual magnetism detection body identification device and control. Device communication connection.

With the above preferred solution, since the relative positions of the residual magnetism detection body 123, the power supply terminal 121 and the detection terminal 122 are fixed, the residual magnetism detection body 123, the power supply terminal 121 and the detection terminal 122 represent the same group of detection components 12, The position code on the residual magnetism detector 123 and the identity code on the current transformer are both unique, and each code is different, which facilitates the subsequent traceability of the current transformer.

In a specific embodiment, the remanence detection body identification device and the transformer identification device may be the same identification device, or may be two mutually independent identification devices.

The above multiple implementations can be implemented in parallel in an interleaved manner.

Place the current transformer to be detected on the transformer bearing unit on the bearing board 2;

The carrier plate 2 moves to the corresponding station on the detection through slot 11;

The control device controls the power terminal 121 and the detection terminal 122 of the detection component 12 to extend out, and are respectively electrically connected to 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 3 to distribute the 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 the current Preliminary judgment of the transformer;

The control device controls the primary winding power distributor 3 to close, and the power terminal 121 and the detection terminal 122 of the detection assembly 12 retract;

In order to further optimize the implementation effect of the present invention, in other embodiments, the remaining feature technologies are the same, the difference is that a demagnetization step is also included before each detection operation, which specifically includes the following contents:

The control device controls the power supply terminal 121 and the detection terminal 122 of the detection component 12 to extend, and are respectively electrically connected to the primary winding terminal and the secondary winding terminal of the current transformer to be demagnetized;

Increase the load of adjustable load 5;

The control device controls the demagnetization device 8 to demagnetize the current transformer. After each demagnetization process, the control device controls the remanence detector 123 to extend to detect the remanence in the current transformer until it is zero, and every The detection results of the secondary residual magnetism detector 123 are all sent to the control device.

In order to further optimize the implementation effect of the present invention, in other embodiments, other feature technologies are the same, the difference is that, before the first detection operation, it also includes: an identity binding step, which specifically includes the following content:

The remanence detector identification device identifies the position code on the remanence detector 123 and sends it to the control device;

At the same time, because the current transformer composite error detection device has the function of identity binding, the current transformer can be freely placed on the transformer carrying unit at any position.

The invention discloses a current transformer composite error detection device and method. The control device controls the primary winding power distributor 3 to distribute appropriate current, and the secondary winding detector 4 can detect the corresponding current in real time. Not only that, the control device can also implement the change of the current detected by the secondary winding detector 4 under different currents of the primary winding power distributor 3 . Or, after adopting different demagnetization methods, the secondary winding detector 4 detects the change of the current.

The device disclosed in the present invention can form different detection schemes according to specific situations, and the control device has the kinetic energy of automatic recording, analysis and identity binding, and can combine the current transformers of the same batch or different batches horizontally or vertically Error analysis.

The above-mentioned embodiments are only for illustrating the technical concept and characteristics of the present invention, and their purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement them, and cannot limit the scope of protection of the present invention with this. The equivalent changes or modifications made shall all be covered within the protection scope of the present invention.

Claims

The current transformer composite error detection device is characterized in that, comprising:

A detection platform, which is provided with a detection through slot, and at least two sets of detection assemblies are arranged on the detection through slot, and each group of the detection assemblies includes: a power supply arranged on one side of the detection through slot a terminal and a detection terminal arranged on the opposite side of the detection through slot, the power supply terminal and the detection terminal can be extended and retracted;

a carrier plate, which is slidably connected to the detection through slot, and is provided with at least two transformer bearing units on the bearing plate, each of which is used to carry a current transformer to be detected;

a primary winding power distributor, which is electrically connected to the power terminals of each group of the detection components respectively, and is used to provide current for the primary winding side of the current transformer;

The secondary winding detector is electrically connected to the detection terminals of each group of the detection components through adjustable loads respectively, and is used for detecting the current on the secondary winding side of the current transformer;

The control device is electrically connected to the primary winding power distributor and the secondary winding detector respectively, and is used for controlling the operation of the primary winding power distributor and the secondary winding detector.
The device for detecting a composite error of a current transformer according to claim 1, characterized in that, on the bearing plate, two adjacent transformer bearing units are isolated by an electromagnetic shielding device.
The composite error detection device for a current transformer according to claim 1, wherein the sliding ends on both sides of the carrier plate are respectively slidably connected to the grooves on both sides of the detection through groove;

Or, the sliding end of the bottom of the carrier plate is slidably connected to the guide rail on the plane of the detection through groove.
The current transformer composite error detection device according to any one of claims 1-3, wherein the current transformer composite error detection device further comprises a demagnetization device, and the demagnetization device is respectively connected with each group of the detection components The power terminal of the device is electrically connected, the demagnetization device is electrically connected with the control device, and the control device controls the demagnetization device to work;

The detection assembly further includes: a residual magnetism detection body disposed on the plane of the detection through-slot and capable of lifting and lowering, and the residual magnetism detection body is used to detect the residual magnetism in the current transformer.
The current transformer composite error detection device according to claim 4, wherein the transformer bearing unit is a "back"-shaped bearing platform, and the middle of the bearing platform is provided with a hole for lifting and lowering the residual magnetism detection body .
The current transformer composite error detection device according to claim 5, wherein each said transformer bearing unit is provided with a transformer identification device for identifying the identity code on the current transformer to be detected, And the transformer identification device is connected with the control device in communication.
The current transformer composite error detection device according to claim 6, wherein each of the transformer carrying units is provided with a residual magnetism detection body identification device, which is used to detect the position on the residual magnetism detection body. The identification device of the residual magnetism detection body is connected with the control device in communication.
The current transformer composite error detection method is characterized in that, using the current transformer composite error detection device according to any one of claims 1-7 to detect, specifically comprising the following steps:

Place the current transformer to be detected on the transformer carrier unit on the carrier board;

The carrier plate moves to the corresponding station on the detection channel;

The control device controls the power supply terminal and the detection terminal of the detection component to extend, and are respectively electrically connected to 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 the corresponding current, the secondary winding detector 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 the current transformer preliminary judgment;

The control device controls the primary winding power distributor to be closed, and the power terminals and the detection terminals of the detection components are retracted;

Repeat the detection of the current transformer for many times, and the control device makes a comprehensive judgment.
The current transformer composite error detection method according to claim 8, characterized in that, before each detection operation, it also includes a demagnetization step, which specifically includes the following content:

The control device controls the power supply terminal and the detection terminal of the detection component to extend, and are respectively electrically connected to the primary winding terminal and the secondary winding terminal of the current transformer to be demagnetized;

Increase the load of the adjustable load;

The control device controls the demagnetization device to demagnetize the current transformer. After each demagnetization process, the control device controls the remanence detection body to extend, and detects the remanence in the current transformer until it is zero, and each time the residual magnetism is detected. The detection results of the magnetic detector are all sent to the control device.
The current transformer composite error detection method according to claim 9, characterized in that, before the first detection operation, further comprising: an identity binding step, which specifically includes the following contents:

The transformer identification device identifies the identity code on the current transformer to be detected, and sends it to the control device;

The remanence detector identification device identifies the position code on the remanence detector and sends it to the control device;

The control device binds the identity code with the corresponding location code.