CN118169628A - Polarity calibration method and device for current transformer and polarity calibration instrument - Google Patents

Abstract

The invention discloses a polarity verification method and device of a current transformer and a polarity verification instrument. Wherein the method comprises the following steps: obtaining standard specification parameters of a current transformer, wherein the current transformer is a component in a GIS sleeve on the high-voltage side of a main transformer, and the GIS sleeve is used for protecting electric components and wires inside the main transformer; when the main transformer is determined to meet the test conditions, determining the power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameters; when the power supply capacity is determined to meet the test condition, reading the primary side current and the secondary side current of the current transformer by using test equipment so as to verify the polarity of the current transformer; and when the proportional relation between the secondary side current and the primary side current meets the preset proportion, determining that the polarity of the current transformer is correct. The invention solves the technical problems of complex method for checking CT polarity and harsh use condition in the related technology.

Description

Polarity calibration method and device for current transformer and polarity calibration instrument

Technical Field

The invention relates to the technical field of relay protection, in particular to a polarity verification method and device of a current transformer and a polarity verification instrument.

Background

The current transformer is one of important devices in the power system, and has the function of converting large current at a primary high-voltage side into micro current for use by secondary devices such as protection, measurement and metering, and isolating the primary device from the secondary device, so that the safe use of the secondary device is ensured, and the polarity of the CT (current transformer) is the relation between the current directions of a primary winding and a secondary winding of the CT (current transformer), and the consistency of current information obtained by the secondary device and primary current information is directly reflected. Therefore, the CT secondary loop polarity test operation is an important step in the power system to ensure that the current transformer is properly connected and operated, and the incorrect CT polarity may cause the protection device to work abnormally, which may cause the power system to malfunction.

The differential protection of the transformer is a main protection of short circuit faults in the transformer and on the outgoing lines, can reflect inter-phase short circuits in the transformer and on the outgoing lines, inter-turn short circuits in the transformer and single-phase grounding short circuit faults at the side of a large-current system, and forms a main transformer high-voltage side short circuit zero lifting current method according to the magnitude and the phase between the same-name phase currents at each side of the transformer, namely, a three-phase short circuit grounding is formed by utilizing a grounding disconnecting link at an outlet at the main transformer high-voltage side.

Aiming at the problems of complex method and severe use condition of CT polarity checking in the related art, no effective solution is proposed at present.

Disclosure of Invention

The embodiment of the invention provides a polarity verification method and device of a current transformer and a polarity verification instrument, which at least solve the technical problems of complex method and severe use condition of CT polarity verification in the related technology.

According to an aspect of the embodiment of the present invention, there is provided a polarity verification method of a current transformer, including: obtaining standard specification parameters of a current transformer, wherein the current transformer is a component in a GIS sleeve on the high-voltage side of a main transformer, and the GIS sleeve is used for protecting electric components and wires inside the main transformer; when the main transformer is determined to meet the test condition, determining the power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameters; when the power supply capacity is determined to meet a test condition, reading a primary side current and a secondary side current of the current transformer by using test equipment to verify the polarity of the current transformer, wherein the primary side current represents a current to be tested received by the current transformer, and the secondary side current represents a current which is output in the current transformer and has a proportional relation with the current to be tested; and when the proportional relation between the secondary side current and the primary side current meets a preset proportion, determining that the polarity of the current transformer is correct.

Optionally, determining that the main transformer meets the test condition includes: checking the GIS sleeve of the main transformer to obtain a checking result; and when the inspection result shows that the GIS sleeve meets the preset condition and the GIS sleeve contains a preset amount of preset gas, determining that the main transformer meets the test condition.

Optionally, determining the power supply capacity required to verify the polarity of the current transformer includes: determining a test parameter for verifying the polarity of the current transformer based on the standard specification parameter; calculating the power supply capacity according to the test parameters by using a first formula, wherein the first formula is as follows: S represents the power supply capacity, S _n represents the rated power, U _k represents the short-circuit impedance, I _k1 represents the primary test current of the high-voltage side of the main transformer, and I _n represents the rated current.

Optionally, the polarity verification method of the current transformer further includes: and after the polarity of the current transformer is determined to be correct, checking the differential protection polarity of the main transformer.

Optionally, verifying the differential protection polarity of the main transformer includes: acquiring the connection state of connecting wires among the test transformer, the test voltage regulator and the main transformer; and when the connection state indicates that the connection line is connected well, adjusting the first output voltage of the test voltage regulator until the first output voltage corresponds to the second output voltage of the test transformer, and/or adjusting the first output voltage of the test voltage regulator until the first high-voltage side current of the test transformer reaches a preset value.

Optionally, before adjusting the first output voltage of the test voltage regulator until the high-side current of the test transformer reaches a predetermined value, the polarity verification method of the current transformer further includes: when the first output voltage of the test voltage regulator is the minimum output voltage, obtaining a second high-voltage side current and a low-voltage side current of the main transformer; judging whether the second high-voltage side current and the low-voltage side current meet a preset range or not to obtain a judging result; and when the judging result shows that the high-voltage side current and the low-voltage side current do not meet the preset range, increasing the first output voltage of the test voltage regulator until the second high-voltage side current and the low-voltage side current meet the preset range.

According to another aspect of the embodiment of the present invention, there is also provided a polarity verification apparatus for a current transformer, including: the acquisition unit is used for acquiring standard specification parameters of a current transformer, wherein the current transformer is a component in a GIS sleeve on the high-voltage side of a main transformer, and the GIS sleeve is used for protecting electric components and wires inside the main transformer; a first determining unit, configured to determine a power supply capacity required for verifying a polarity of the current transformer based on the standard specification parameter when it is determined that the main transformer meets a test condition; the reading unit is used for reading a primary side current and a secondary side current of the current transformer by using testing equipment when the power supply capacity meets the testing condition, so as to verify the polarity of the current transformer, wherein the primary side current represents a current to be tested received by the current transformer, and the secondary side current represents a current which is output in the current transformer and has a proportional relation with the current to be tested; and the second determining unit is used for determining that the polarity of the current transformer is correct when the proportional relation between the secondary side current and the primary side current meets the preset proportion.

Optionally, the first determining unit includes: the first acquisition module is used for checking the GIS sleeve of the main transformer to obtain a checking result; and the first determining module is used for determining that the main transformer meets the test condition when the inspection result shows that the GIS sleeve meets the preset condition and the GIS sleeve contains a preset amount of preset gas.

Optionally, the first determining unit includes: the second determining module is used for determining a test parameter for verifying the polarity of the current transformer based on the standard specification parameter; the calculation module is used for calculating the power supply capacity according to the test parameters by using a first formula, wherein the first formula is as follows: S represents the power supply capacity, S _n represents the rated power, U _k represents the short-circuit impedance, I _k1 represents the primary test current of the high-voltage side of the main transformer, and I _n represents the rated current.

Optionally, the polarity verification device of the current transformer further includes: and the verification unit is used for verifying the differential protection polarity of the main transformer after determining that the polarity of the current transformer is correct.

Optionally, the verification unit includes: the second acquisition module is used for acquiring the connection state of the connecting wire between the test transformer, the test voltage regulator and the main transformer; and the first adjusting module is used for adjusting the first output voltage of the test voltage regulator until the first output voltage corresponds to the second output voltage of the test transformer and/or adjusting the first output voltage of the test voltage regulator until the first high-voltage side current of the test transformer reaches a preset value when the connection state indicates that the connection line is connected well.

Optionally, the polarity verification device of the current transformer further includes: the third acquisition module is used for acquiring a second high-voltage side current and a low-voltage side current of the main transformer when the first output voltage of the test voltage regulator is the minimum output voltage before the first output voltage of the test voltage regulator is regulated until the high-voltage side current of the test voltage regulator reaches a preset value; a fourth obtaining module, configured to determine whether the second high-voltage side current and the low-voltage side current meet a predetermined range, to obtain a determination result; and the second adjusting module is used for increasing the first output voltage of the test voltage regulator until the second high-voltage side current and the low-voltage side current meet the preset range when the judging result shows that the high-voltage side current and the low-voltage side current do not meet the preset range.

According to another aspect of the embodiment of the present invention, there is also provided a polarity calibration apparatus for a current transformer, including: and the polarity calibrator of the current transformer uses the polarity calibrator method of any one of the current transformers.

According to another aspect of the embodiment of the present invention, there is also provided a computer readable storage medium including a stored program, wherein the program executes the polarity verification method of the current transformer described in any one of the above.

According to another aspect of the embodiment of the present invention, there is further provided a processor, where the processor is configured to run a program, and when the program runs, execute any one of the above-mentioned polarity verification methods of the current transformer.

According to another aspect of the embodiments of the present invention, there is also provided a computer program product comprising computer instructions which, when executed by a processor, perform the method for verifying the polarity of a current transformer as described in any one of the above.

In the embodiment of the invention, standard specification parameters of a current transformer are obtained, wherein the current transformer is a component in a GIS sleeve on the high-voltage side of a main transformer, and the GIS sleeve is used for protecting electric components and wires inside the main transformer; when the main transformer is determined to meet the test conditions, determining the power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameters; when the power supply capacity is determined to meet the test condition, reading primary side current and secondary side current of the current transformer by using test equipment to verify the polarity of the current transformer, wherein the primary side current represents current to be tested received by the current transformer, and the secondary side current represents current which is output in the current transformer and has a proportional relation with the current to be tested; and when the proportional relation between the secondary side current and the primary side current meets the preset proportion, determining that the polarity of the current transformer is correct. According to the technical scheme, the purpose that the primary side current and the secondary side current of the current transformer are read by using the testing equipment, and whether the polarity of the current transformer is correct is judged by judging whether the primary side current and the secondary side current accord with the transformation ratio is achieved, the technical effect that the polarity of the current transformer is checked by using the testing equipment and the testing method which are simple and easy to operate is achieved, and the technical problems that the method for checking the polarity of CT is complex and the using condition is harsh in the related technology are solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

Fig. 1 is a hardware block diagram of a mobile terminal of a polarity verification method of a current transformer according to an embodiment of the present invention;

FIG. 2 is a flow chart of a method of verifying the polarity of a current transformer according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a polarity calibrator for a current transformer in accordance with an embodiment of the present invention;

Fig. 4 is a schematic diagram of a polarity verification device of a current transformer according to an embodiment of the present invention.

Wherein the above figures include the following reference numerals: 1. a checker housing; 2. and a handle sliding frame.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As described in the background art, the method for checking the polarity of CT in the related art is complex and has severe use conditions. Aiming at the defects, the embodiment of the invention provides a polarity verification method and device of a current transformer and a polarity verification instrument.

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.

The method embodiments provided in the embodiments of the present invention may be performed in a mobile terminal, a computer terminal or similar computing device. Taking the mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of the mobile terminal of a polarity verification method of a current transformer according to an embodiment of the present invention. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a method for verifying the polarity of a current transformer in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104, thereby performing various functional applications and data processing, that is, implementing the method described above. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a Network adapter (NIC) that can connect to other Network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module for communicating with the internet wirelessly.

According to an embodiment of the present invention, there is provided a method embodiment of a polarity verification method for a current transformer, it should be noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different from that herein.

Fig. 2 is a flowchart of a polarity verification method of a current transformer according to an embodiment of the present invention, as shown in fig. 2, the method includes the steps of:

Step S202, standard specification parameters of a current transformer are obtained, wherein the current transformer is a component in a GIS sleeve on the high-voltage side of a main transformer, and the GIS sleeve is used for protecting electric components and wires inside the main transformer.

Alternatively, the standard specification parameters may include, but are not limited to, parameters such as rated transformation ratio, rated voltage, rated current of the current transformer, etc.

In the embodiment, the performance and the application range of the current transformer can be known according to the standard specification parameters of the current transformer, so that the test parameters are correctly set in the test process, and the test correctness is ensured.

Step S204, when the main transformer is determined to meet the test condition, determining the power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameters.

In this embodiment, it is necessary to ensure that the main transformer, the test equipment and the instruments can all work normally and that the calibration is accurate so that the test can be performed formally, thereby ensuring the safety in the test process and the accuracy of the test result.

According to the above embodiment of the present invention, in the above step S204, determining that the main transformer satisfies the test condition includes: checking the GIS sleeve of the main transformer to obtain a checking result; and when the inspection result shows that the GIS sleeve meets the preset condition and the GIS sleeve contains a preset amount of preset gas, determining that the main transformer meets the test condition.

Optionally, the predetermined gas may be SF6 gas.

In this embodiment, the GIS bushing is used as a gas-insulated metal-enclosed switchgear, and can be used to protect a current transformer placed inside the GIS bushing and ensure that SF6 gas inside the GIS bushing is not leaked, so as to perform the functions of isolation, protection and sealing.

When the GIS sleeve of the main transformer is checked to be qualified, the main transformer can be checked by the following steps: 1) Checking the installation record: confirming the installation record of the GIS sleeve on the high-voltage side of the main transformer, wherein the installation record comprises information such as installation date, installation personnel, installation position and the like; 2) Checking the installation position: checking the installation position of the GIS sleeve on the high-voltage side of the main transformer to ensure that the installation position is consistent with the design requirement and has no obvious damage or deformation; 3) Calibrating instrument equipment: the testing equipment and the instrument are ensured to be calibrated, and the related parameters of the GIS sleeve can be accurately measured; 4) The test was performed: testing the main transformer high-voltage side GIS sleeve by using testing equipment and instruments with accurate calibration, wherein the testing equipment and instruments comprise electrical parameter testing, tightness testing and the like; 5) Checking gas filling: the qualified SF6 gas filled in the GIS is confirmed, and the gas filling record is checked, so that the filling process is ensured to meet the requirements; 6) Inspection test report: analyzing and summarizing the test results, generating a test report and auditing the test report to ensure that the test results meet the requirements; therefore, the installed test of the GIS sleeve on the high-voltage side of the main transformer is ensured to be qualified, and the safe operation and normal use of the equipment can be ensured.

In addition, SF6 gas is a special gas used as an insulating medium and an arc extinguishing medium, and is mainly used for the purposes of insulation and arc extinguishing, so that the GIS sleeve is ensured to be filled with qualified SF6 gas, normal operation and safe operation of equipment can be ensured, meanwhile, arc extinguishing can be effectively carried out when faults occur, and the safety of the equipment and personnel is protected.

According to the above embodiment of the present invention, in the above step S204, determining the power supply capacity required for verifying the polarity of the current transformer includes: determining test parameters for verifying the polarity of the current transformer based on the standard specification parameters; calculating the power supply capacity according to the test parameters by using a first formula, wherein the first formula is as follows: S denotes a power supply capacity, S _n denotes a rated power amount, U _k denotes a short-circuit impedance, I _k1 denotes a primary test current on the high-voltage side of the main transformer, and I _n denotes a rated current.

Alternatively, the above-described test parameters may include, but are not limited to: test current, test voltage, etc.

In this embodiment, the formula may be utilized: Calculating the power supply capacity, namely the test power supply power, wherein S represents the power supply capacity, S _n represents the rated power, U _k represents the short-circuit impedance, I _k1 represents the primary test current of the high-voltage side of the main transformer, and I _n represents the rated current; the required test voltage can be calculated using the formula: /(I) Calculation is performed, wherein U represents the test voltage of the high-voltage side of the main transformer, and U _n represents the rated voltage.

And S206, when the power supply capacity is determined to meet the test condition, reading the primary side current and the secondary side current of the current transformer by using test equipment to verify the polarity of the current transformer, wherein the primary side current represents the current to be tested received by the current transformer, and the secondary side current represents the current which is output in the current transformer and has a proportional relation with the current to be tested.

The following describes the above embodiment of the present invention in detail with reference to fig. 3, and fig. 3 is a schematic diagram of a polarity calibration apparatus of a current transformer according to an embodiment of the present invention. As shown in fig. 3, the structural axis of the polarity tester is shown, and the side wall of the bottom of the tester housing 1 contacting the ground is fixedly connected with the grip sliding frame 2.

When the polarity of the current transformer in the main transformer is tested by using the polarity calibrator, the housing of the polarity calibrator is connected to the primary side and the secondary side of the current transformer, a known test current is applied to the primary side of the current transformer, and then the secondary side current of the current transformer is read by using the polarity calibrator, wherein the secondary side current is obtained by the primary side current through transformation ratio. The polarity of the current transformer is judged to be correct mainly by verifying whether the secondary side current of the voltage transformer is the same as the primary side current after transformation ratio calculation. In general, if the polarity of the current transformer is correct, after a test current is applied to the primary side of the current transformer, the current read at the secondary side of the current transformer should be the same as the primary side current after transformation ratio calculation.

It should be noted that, the primary side of the current transformer refers to the side of the current transformer directly related to the measured current, and is usually connected to the measured current through a wire or a current carrier; the secondary side of the current transformer refers to the side of the current transformer from which current is output, typically by the transformer principle, the primary side current signal is converted into a standard secondary side current output for connection to a measuring instrument or other device for further processing.

In step S208, when the proportional relationship between the secondary side current and the primary side current satisfies the predetermined ratio, it is determined that the polarity of the current transformer is correct.

In this embodiment, the primary current of the current transformer is converted into the secondary current of the current transformer by the transformer principle, that is, the secondary current is obtained by the primary current through the transformation ratio; here, whether the polarity of the current transformer is correct may be determined by determining whether the ratio between the secondary side current and the primary side current satisfies the transformation ratio, or whether the polarity of the current transformer is correct may be determined by comparing whether the value of the read secondary side current and the value of the primary side current after the transformation ratio are identical.

According to the embodiment of the invention, the polarity verification method of the current transformer further comprises the following steps: and after the polarity of the current transformer is determined to be correct, checking the differential protection polarity of the main transformer.

In the embodiment, after the polarity of the current transformer is tested, the polarity of the differential protection of the small range of the main transformer is required to be checked, and the verification of the polarity of the differential protection of the small range of the main transformer can help to confirm that the differential protection device of the small range of the main transformer can accurately detect the current of the high and low voltage sides of the main transformer in actual operation, so that the operation state of the main transformer is accurately monitored and protected; by verifying the differential protection polarity of the main transformer in a small range, the operation state of the main transformer can be accurately identified when the differential protection device of the main transformer in a small range is in protection tripping, so that the safe operation of main transformer equipment and a power system can be effectively protected. The method for verifying the differential protection polarity of the main transformer in a small range is described in detail below, and will not be described in detail here.

In the above embodiment of the present invention, verifying the differential protection polarity of the main transformer includes: acquiring the connection state of connecting wires among the test transformer, the test voltage regulator and the main transformer; and when the connection state indicates that the connection line is connected well, adjusting the first output voltage of the test voltage regulator until the first output voltage corresponds to the second output voltage of the test transformer, and/or adjusting the first output voltage of the test voltage regulator until the first high-voltage side current of the test transformer reaches a preset value.

Firstly, connecting wires among a test transformer, a test voltage regulator and a main transformer; then, the output voltage protection of the test voltage regulator is set to correspond to the output voltage of the test transformer, and a tripping test is performed; and/or by adjusting the output voltage of the test voltage regulator until the test transformer high side current reaches 15A and remains stable.

The verification of the differential protection polarity of the main transformer is mainly used for confirming that the differential protection device of the main transformer in a small range works normally, and the protection device can accurately monitor and protect the voltage and the current of the main transformer.

The tripping test refers to a small-range differential protection device for the main transformer, and when the tripping test confirms that the device can accurately and timely trip when the protection action condition is reached, so as to protect the safety and the reliability of equipment and a system.

In this embodiment, before adjusting the first output voltage of the test voltage regulator until the high-side current of the test transformer reaches a predetermined value, the polarity verification method of the current transformer further includes: when the first output voltage of the test voltage regulator is the minimum output voltage, obtaining a second high-voltage side current and a low-voltage side current of the main transformer; judging whether the second high-voltage side current and the low-voltage side current meet a preset range or not to obtain a judging result; and when the judging result shows that the high-voltage side current and the low-voltage side current do not meet the preset range, increasing the first output voltage of the test voltage regulator until the second high-voltage side current and the low-voltage side current meet the preset range.

Before the output voltage of the test voltage regulator is regulated until the high-voltage side current of the test transformer reaches a preset range, a return-to-zero adjustment is needed to be performed on the test voltage regulator so as to ensure that the current of the high-voltage side current transformer of the main transformer is in a normal range.

The test voltage regulator can be adjusted to the minimum position firstly, the current of the high-voltage side current transformer of the main transformer is monitored in the adjusting process, and after the current of the high-voltage side current transformer of the main transformer is confirmed to be in a normal range, the output voltage of the test voltage regulator is adjusted slowly until the current of the high-voltage side of the test transformer reaches 15A, and the current is kept stable.

According to the method, standard specification parameters of the current transformer can be obtained through the steps, wherein the current transformer is a component in a GIS bushing at the high-voltage side of the main transformer, and the GIS bushing is used for protecting electric components and wires inside the main transformer; when the main transformer is determined to meet the test conditions, determining the power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameters; when the power supply capacity is determined to meet the test condition, reading primary side current and secondary side current of the current transformer by using test equipment to verify the polarity of the current transformer, wherein the primary side current represents current to be tested received by the current transformer, and the secondary side current represents current which is output in the current transformer and has a proportional relation with the current to be tested; when the proportion relation between the secondary side current and the primary side current meets the preset proportion, the correct polarity of the current transformer is determined, the purposes of reading the primary side current and the secondary side current of the current transformer by using test equipment and judging whether the primary side current and the secondary side current meet the transformation ratio or not are achieved, the technical effect of checking the polarity of the current transformer by using simple and easy-to-operate test equipment and test method is achieved, and the technical problems that the method for checking the polarity of CT is complex and the use condition is severe in the related technology are solved.

Therefore, by the technical scheme provided by the embodiment of the invention, the technical problems that the method for checking the CT polarity is complex and the use condition is harsh in the related technology are solved.

It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present application.

According to an embodiment of the present invention, there is further provided a polarity verification apparatus for a current transformer for implementing the polarity verification method of a current transformer, and fig. 4 is a schematic diagram of the polarity verification apparatus for a current transformer according to an embodiment of the present invention, as shown in fig. 4, where the apparatus includes: an acquisition unit 41, a first determination unit 43, a reading unit 45, and a second determination unit 47. The device will be described in detail below.

And an acquisition unit 41 for acquiring standard specification parameters of a current transformer, wherein the current transformer is a component in a high-voltage side GIS bushing of the main transformer, and the GIS bushing is used for protecting electric components and wires inside the main transformer.

The first determining unit 43 is configured to determine a power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameter when it is determined that the main transformer satisfies the test condition.

And a reading unit 45, configured to read, when it is determined that the power supply capacity meets the test condition, a primary side current and a secondary side current of the current transformer by using a test device, so as to verify the polarity of the current transformer, where the primary side current represents a current to be tested received by the current transformer, and the secondary side current represents a current output in the current transformer and proportional to the current to be tested.

The second determining unit 47 is configured to determine that the polarity of the current transformer is correct when the proportional relation between the secondary side current and the primary side current satisfies a predetermined ratio.

Here, the above-described obtaining unit 41, the first determining unit 43, the reading unit 45, and the second determining unit 47 correspond to steps S202 to S208 in the above-described embodiments, and the four units are the same as examples and application scenarios implemented by the corresponding steps, but are not limited to those disclosed in the above-described embodiments.

In the solution described in the above embodiment of the present invention, the obtaining unit may be used to obtain standard specification parameters of a current transformer, where the current transformer is a component in a high-voltage side GIS bushing of a main transformer, and the GIS bushing is used to protect electrical components and wires inside the main transformer; then, when the main transformer is determined to meet the test condition by utilizing the first determining unit, determining the power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameters; when the power supply capacity is determined to meet the test condition, the primary side current and the secondary side current of the current transformer are read by using the test equipment to verify the polarity of the current transformer, wherein the primary side current represents the current to be tested received by the current transformer, and the secondary side current represents the current which is output in the current transformer and has a proportional relation with the current to be tested; and finally, when the proportion relation between the secondary side current and the primary side current meets the preset proportion, the second determining unit is used for determining that the polarity of the current transformer is correct, the purposes of reading the primary side current and the secondary side current of the current transformer by using the testing equipment and judging whether the current transformer is correct or not by judging whether the current transformer accords with the transformation ratio are achieved, the technical effect of checking the polarity of the current transformer by using the testing equipment and the testing method which are simple and easy to operate is achieved, and the technical problems that the method for checking the polarity of CT is complex and the using condition is harsh in the related technology are further solved.

Therefore, by the technical scheme provided by the embodiment of the invention, the technical problems that the method for checking the CT polarity is complex and the use condition is harsh in the related technology are solved.

Optionally, the first determining unit includes: the first acquisition module is used for checking the GIS sleeve of the main transformer to obtain a checking result; and the first determining module is used for determining that the main transformer meets the test condition when the inspection result shows that the GIS sleeve meets the preset condition and the GIS sleeve contains a preset amount of preset gas.

Optionally, the first determining unit includes: the second determining module is used for determining a test parameter for checking the polarity of the current transformer based on the standard specification parameter; the calculation module is used for calculating the power supply capacity according to the test parameters by using a first formula, wherein the first formula is as follows: S denotes a power supply capacity, S _n denotes a rated power amount, U _k denotes a short-circuit impedance, I _k1 denotes a primary test current on the high-voltage side of the main transformer, and I _n denotes a rated current.

Optionally, the polarity verification device of the current transformer further includes: and the verification unit is used for verifying the differential protection polarity of the main transformer after determining that the polarity of the current transformer is correct.

Optionally, the verification unit includes: the second acquisition module is used for acquiring the connection state of the connecting wire among the test transformer, the test voltage regulator and the main transformer; the first adjusting module is used for adjusting the first output voltage of the test voltage regulator until the first output voltage corresponds to the second output voltage of the test transformer and/or adjusting the first output voltage of the test voltage regulator until the first high-voltage side current of the test transformer reaches a preset value when the connection state indicates that the connection line is connected well.

Optionally, the polarity verification device of the current transformer further includes: the third acquisition module is used for acquiring a second high-voltage side current and a low-voltage side current of the main transformer when the first output voltage of the test voltage regulator is the minimum output voltage before the first output voltage of the test voltage regulator is regulated until the high-voltage side current of the test voltage regulator reaches a preset value; the fourth acquisition module is used for judging whether the second high-voltage side current and the low-voltage side current meet a preset range or not to obtain a judgment result; and the second adjusting module is used for increasing the first output voltage of the test voltage regulator until the second high-voltage side current and the low-voltage side current meet the preset range when the judging result shows that the high-voltage side current and the low-voltage side current do not meet the preset range.

According to another aspect of the embodiment of the present invention, there is also provided a polarity calibration apparatus for a current transformer, including: the polarity calibrator of the current transformer uses the polarity calibrator method of any one of the current transformers.

According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein the program performs the polarity verification method of the current transformer of any one of the above.

Alternatively, in the present embodiment, the above-described computer-readable storage medium may be located in any one of a group of computer terminals in a computer network, or in any one of a group of communication devices.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: obtaining standard specification parameters of a current transformer, wherein the current transformer is a component in a GIS sleeve on the high-voltage side of a main transformer, and the GIS sleeve is used for protecting electric components and wires inside the main transformer; when the main transformer is determined to meet the test conditions, determining the power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameters; when the power supply capacity is determined to meet the test condition, reading primary side current and secondary side current of the current transformer by using test equipment to verify the polarity of the current transformer, wherein the primary side current represents current to be tested received by the current transformer, and the secondary side current represents current which is output in the current transformer and has a proportional relation with the current to be tested; and when the proportional relation between the secondary side current and the primary side current meets the preset proportion, determining that the polarity of the current transformer is correct.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: checking the GIS sleeve of the main transformer to obtain a checking result; and when the inspection result shows that the GIS sleeve meets the preset condition and the GIS sleeve contains a preset amount of preset gas, determining that the main transformer meets the test condition.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: determining test parameters for verifying the polarity of the current transformer based on the standard specification parameters; calculating the power supply capacity according to the test parameters by using a first formula, wherein the first formula is as follows: S denotes a power supply capacity, S _n denotes a rated power amount, U _k denotes a short-circuit impedance, I _k1 denotes a primary test current on the high-voltage side of the main transformer, and I _n denotes a rated current.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: and after the polarity of the current transformer is determined to be correct, checking the differential protection polarity of the main transformer.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: acquiring the connection state of connecting wires among the test transformer, the test voltage regulator and the main transformer; and when the connection state indicates that the connection line is connected well, adjusting the first output voltage of the test voltage regulator until the first output voltage corresponds to the second output voltage of the test transformer, and/or adjusting the first output voltage of the test voltage regulator until the first high-voltage side current of the test transformer reaches a preset value.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: when the first output voltage of the test voltage regulator is the minimum output voltage, obtaining a second high-voltage side current and a low-voltage side current of the main transformer; judging whether the second high-voltage side current and the low-voltage side current meet a preset range or not to obtain a judging result; and when the judging result shows that the high-voltage side current and the low-voltage side current do not meet the preset range, increasing the first output voltage of the test voltage regulator until the second high-voltage side current and the low-voltage side current meet the preset range.

According to another aspect of the embodiment of the present invention, there is further provided a processor, configured to execute a program, where the program executes any one of the above-mentioned polarity verification methods of the current transformer during running.

According to another aspect of the embodiments of the present invention, there is also provided a computer program product comprising computer instructions which, when executed by a processor, perform a method of verifying the polarity of a current transformer of any one of the above.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a Read-only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. A polarity verification method for a current transformer, comprising:

Obtaining standard specification parameters of a current transformer, wherein the current transformer is a component in a GIS sleeve on the high-voltage side of a main transformer, and the GIS sleeve is used for protecting electric components and wires inside the main transformer;

when the main transformer is determined to meet the test condition, determining the power supply capacity required for verifying the polarity of the current transformer based on the standard specification parameters;

When the power supply capacity is determined to meet a test condition, reading a primary side current and a secondary side current of the current transformer by using test equipment to verify the polarity of the current transformer, wherein the primary side current represents a current to be tested received by the current transformer, and the secondary side current represents a current which is output in the current transformer and has a proportional relation with the current to be tested;

and when the proportional relation between the secondary side current and the primary side current meets a preset proportion, determining that the polarity of the current transformer is correct.

2. The method of polarity verification of a current transformer of claim 1, wherein determining that the main transformer meets a test condition comprises:

Checking the GIS sleeve of the main transformer to obtain a checking result;

And when the inspection result shows that the GIS sleeve meets the preset condition and the GIS sleeve contains a preset amount of preset gas, determining that the main transformer meets the test condition.

3. The method of verifying polarity of a current transformer of claim 1, wherein determining a power supply capacity required to verify the polarity of the current transformer comprises:

determining a test parameter for verifying the polarity of the current transformer based on the standard specification parameter;

Calculating the power supply capacity according to the test parameters by using a first formula, wherein the first formula is as follows:

S represents the power supply capacity, S _n represents the rated power, U _k represents the short-circuit impedance, I _k1 represents the primary test current of the high-voltage side of the main transformer, and I _n represents the rated current.

4. The method of polarity verification of a current transformer of claim 1, further comprising:

and after the polarity of the current transformer is determined to be correct, checking the differential protection polarity of the main transformer.

5. The method of verifying polarity of a current transformer of claim 4, wherein verifying differential protection polarity of the main transformer comprises:

acquiring the connection state of connecting wires among the test transformer, the test voltage regulator and the main transformer;

And when the connection state indicates that the connection line is connected well, adjusting the first output voltage of the test voltage regulator until the first output voltage corresponds to the second output voltage of the test transformer, and/or adjusting the first output voltage of the test voltage regulator until the first high-voltage side current of the test transformer reaches a preset value.

6. The method of polarity calibration of a current transformer of claim 5, further comprising, prior to adjusting the first output voltage of the test voltage regulator until the high side current of the test transformer reaches a predetermined value:

When the first output voltage of the test voltage regulator is the minimum output voltage, obtaining a second high-voltage side current and a low-voltage side current of the main transformer;

Judging whether the second high-voltage side current and the low-voltage side current meet a preset range or not to obtain a judging result;

And when the judging result shows that the high-voltage side current and the low-voltage side current do not meet the preset range, increasing the first output voltage of the test voltage regulator until the second high-voltage side current and the low-voltage side current meet the preset range.

7. A polarity verification device for a current transformer, comprising:

the acquisition unit is used for acquiring standard specification parameters of a current transformer, wherein the current transformer is a component in a GIS sleeve on the high-voltage side of a main transformer, and the GIS sleeve is used for protecting electric components and wires inside the main transformer;

A first determining unit, configured to determine a power supply capacity required for verifying a polarity of the current transformer based on the standard specification parameter when it is determined that the main transformer meets a test condition;

The reading unit is used for reading a primary side current and a secondary side current of the current transformer by using testing equipment when the power supply capacity meets the testing condition, so as to verify the polarity of the current transformer, wherein the primary side current represents a current to be tested received by the current transformer, and the secondary side current represents a current which is output in the current transformer and has a proportional relation with the current to be tested;

And the second determining unit is used for determining that the polarity of the current transformer is correct when the proportional relation between the secondary side current and the primary side current meets the preset proportion.

8. A polarity check gauge of a current transformer, comprising: a tester housing, the polarity tester of the current transformer using the polarity testing method of the current transformer as claimed in any one of the preceding claims 1 to 6.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the program performs the polarity verification method of the current transformer according to any one of claims 1 to 6.

10. A computer program product comprising computer instructions which, when executed by a processor, perform the method of checking the polarity of a current transformer as claimed in any one of claims 1 to 6.