CN113848526A

CN113848526A - Voltage transformer loop detection method, system, equipment and storage medium

Info

Publication number: CN113848526A
Application number: CN202111111429.4A
Authority: CN
Inventors: 朱晓东; 王勋江; 冯宗建; 王其林; 郑润蓝; 盛江; 黄志纯; 郑志文; 宫科; 王宁; 刘丽珍; 刘森; 冯琳; 李金融; 梁朝政; 李洋
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2021-12-28
Anticipated expiration: 2041-09-18
Also published as: CN113848526B

Abstract

The invention relates to a voltage transformer loop detection method, a system, equipment and a storage medium, wherein two-phase alternating-current voltages are applied to any two phases of three phases on a primary side, a first group of voltages on a secondary side after the two-phase alternating-current voltages are applied are detected, three-phase alternating-current voltages are respectively applied to the three phases on the primary side, a second group of voltages on the secondary side after the three-phase alternating-current voltages are applied are detected, and a secondary loop polarity detection result is obtained according to the first group of voltages and the second group of voltages, so that the detection efficiency and quality of voltage transformer loop wiring are improved, and the reliable operation of primary and secondary equipment of a transformer substation is further ensured.

Description

Voltage transformer loop detection method, system, equipment and storage medium

Technical Field

The invention relates to the field of voltage transformer loop detection in a power supply system, in particular to a voltage transformer loop detection method, a voltage transformer loop detection system, voltage transformer loop detection equipment and a storage medium.

Background

With the continuous improvement of the urban development level and the continuous abundance of the power consumption demand, the requirement on the power supply reliability of the power supply system is higher and higher. In a 10kV system of a power supply grid, in order to eliminate the adverse effect of ferromagnetic resonance on a voltage transformer, a three-phase four-star voltage transformer (4 PT connection voltage transformer for short) is widely applied. After the 4PT wiring voltage transformer completes secondary wiring, verification and inspection are carried out according to items specified by regulations, possible defects of three-phase voltage transformer polarity wiring errors, secondary circuit virtual connection open circuits and the like are eliminated, and influence on normal operation of secondary equipment such as transformer substation relay protection and the like is avoided.

The existing method for testing the wiring correctness of the secondary circuit of the 4PT voltage transformer comprises the following steps: firstly, a maintainer carries out image verification on the correctness of the wiring according to information such as secondary terminal identification, a line mark and the like of the mutual inductor; secondly, the maintainer untwists the secondary wire of each winding and checks and tests the polarity of each winding one by one.

The method for testing the wiring correctness of the secondary circuit of the existing 4PT voltage transformer has the following defects: a large amount of investigation operations rely on the maintainer, and the investigation wiring is wasted time and energy and is inefficient, and to hidden open circuit defect existence manmade error, probably causes the problem that the hidden danger defect of equipment can not in time be handled, and then influences the reliable operation of primary and secondary equipment such as transformer substation relay protection.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a method, a system, a device and a storage medium for detecting a voltage transformer loop.

A voltage transformer loop detection method is disclosed, wherein the voltage transformer comprises a primary side and a secondary side; the detection method comprises the following steps:

applying a two-phase alternating current voltage to any two of the three phases of the primary side;

detecting a first group of voltages on the secondary side after the two-phase alternating voltage is applied;

applying three-phase ac voltages to the three phases of the primary side, respectively;

detecting a second group of voltages on the secondary side after the three-phase alternating voltage is applied;

and acquiring a secondary loop polarity detection result according to the first group of voltages and the second group of voltages.

A voltage transformer loop detection system, the voltage transformer includes a primary side and a secondary side; the detection system comprises:

a first input module configured to apply a two-phase alternating-current voltage to any two of three phases on the primary side;

the first detection module is used for detecting a first group of voltages on the secondary side after the two-phase alternating voltage is applied;

a second input module for applying three-phase alternating-current voltages to the three phases of the primary side, respectively;

the second detection module is used for detecting a second group of voltages on the secondary side after the three-phase alternating voltage is applied;

and the acquisition module is used for acquiring a secondary loop polarity detection result according to the first group of voltages and the second group of voltages.

According to the voltage transformer loop detection method, the system, the equipment and the storage medium, the two-phase alternating voltage is applied to any two phases of the three phases of the primary side, the first group of voltages of the secondary side after the two-phase alternating voltage is applied is detected, the three-phase alternating voltage is respectively applied to the three phases of the primary side, the second group of voltages of the secondary side after the three-phase alternating voltage is applied is detected, and the secondary loop polarity detection result is obtained according to the first group of voltages and the second group of voltages, so that the voltage transformer loop wiring detection efficiency and quality are improved, and the reliable operation of the primary and secondary equipment of the transformer substation is further guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow diagram of a method for voltage transformer loop detection in one embodiment;

FIG. 2 is a schematic diagram of a wiring mode of a three-phase four-star voltage transformer in one embodiment;

fig. 3 is a schematic diagram of voltages of each phase when the zero sequence voltage transformer is normal in polarity in one embodiment;

FIG. 4 is a schematic diagram of voltages of each phase when the zero-sequence voltage transformer is connected with a reverse polarity in one embodiment;

FIG. 5 is a schematic diagram of voltage transformers in one embodiment with reversed polarity connections between the front and rear line voltages;

FIG. 6 is a flow diagram of a method for voltage transformer loop detection in one embodiment;

FIG. 7 is a schematic diagram of a secondary side partial terminal in one embodiment;

FIG. 8 is a flowchart detailing step 110 of FIG. 1 in one embodiment;

FIG. 9 is a flowchart detailing step 802 of FIG. 8 in one embodiment;

FIG. 10 is a flowchart detailing step 804 of FIG. 8 in one embodiment;

FIG. 11 is a flowchart detailing step 804 of FIG. 8 in one embodiment;

FIG. 12 is a flowchart detailing step 804 of FIG. 8 in one embodiment;

FIG. 13 is a flowchart detailing step 804 of FIG. 8 in one embodiment;

FIG. 14 is a block diagram of the voltage transformer loop detection system in one embodiment;

fig. 15 is a block diagram of a voltage transformer loop detection system in an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first client may be referred to as a second client, and similarly, a second client may be referred to as a first client, without departing from the scope of the present application. Both the first client and the second client are clients, but they are not the same client.

Referring to fig. 1, a flowchart of a method for detecting a voltage transformer loop according to an embodiment is shown.

In this embodiment, as shown in fig. 1, the voltage transformer loop detection method includes steps 102 to 110.

Step 102, a two-phase ac voltage is applied to any two of the three phases on the primary side.

The voltage transformer is an instrument for converting voltage, can be used for supplying power to a measuring instrument and a relay protection device, can also be used for measuring the voltage, power and electric energy of a line, and can also be used for protecting valuable equipment, a motor and a transformer in the line when the line has a fault. The three-phase four-star voltage transformer (4 PT wiring voltage transformer for short) is a single-phase voltage transformer which is a zero-sequence voltage transformer connected in series at a neutral point of the three-phase voltage transformer. By adopting the connection mode, when the system is in single-phase grounding, most of zero-sequence voltage is applied to the zero-sequence voltage transformer, the voltage born by each phase is not too high, the voltage transformer is not easy to saturate, the induction factor of ferromagnetic resonance is effectively eliminated, and the ferromagnetic resonance phenomenon is further inhibited.

The three-phase four-star voltage transformer comprises a primary side and a secondary side. As shown in fig. 2, A, B, C are primary windings on three primary sides, 1a, 1b, 1c, 2a, 2b, and 2c are secondary windings on three phases, N, N are a zero-sequence voltage-variable primary winding and a zero-sequence voltage-variable secondary winding, N600 is a secondary ground terminal, and YJ is a relay protection device.

Any two of the three phases on the primary side may be any two of the A, B, C three phases of the three-phase voltage transformer on the primary side, and for example, the phases a and B, B and C, or a and C.

The amplitude of the two-phase ac voltage applied to the primary side may be determined according to a transformation ratio of the voltage transformer. If the transformation ratio of the voltage transformer is N: 1, applying an alternating current voltage with a rated amplitude of N to the primary side, for example, if the transformation ratio of the voltage transformer is 100: 1, applying 100VAC (100V alternating current) rated voltage on the primary side; and the phase angle of the voltage applied to the primary side is 60 degrees.

The method for controlling the phase angle and amplitude of the voltage to be applied can control the amplitude and phase angle of the voltage to be applied through PLC control or manual switch control.

Step 104, detecting a first group of voltages on the secondary side after the two-phase alternating voltage is applied.

The first group voltage may be a voltage between the secondary-side terminals or a voltage between the secondary-side terminal and the primary-side three-phase.

The method for detecting the first group of voltages on the secondary side after the two-phase alternating-current voltage is applied can be that after the two-phase alternating-current voltage is applied, the voltage amplitude and the phase angle of a secondary side line are measured through a test instrument connected to a secondary side winding in parallel.

For example, if the transformation ratio of the voltage transformer is 100: 1, when voltage is applied to B, C two phases of three phases on the primary side, the voltage is 100VAC, the phase angle is 60 degrees, and no voltage is applied to the phase a, the zero sequence voltage transformer bears zero sequence voltage, and under the condition that the wiring is normal, as shown in fig. 3, the phase a voltage is 0, and the other two phase voltages are increased to be equal to

Multiplying the initial phase voltage; if the zero sequence voltage transformer is connected in a reversed polarity manner, as shown in fig. 4, the a phase voltage is 2 times of the initial phase voltage, and the rest phase voltages are kept unchanged. In fig. 3 and 4, the solid line is used to represent the initial phase voltage, the dotted line is used to represent the synthesized phase voltage, and the virtual-real alternate line is used to represent the zero sequence voltage H.

Step 106, three-phase ac voltages are applied to the three phases on the primary side.

The method of applying three-phase ac voltages to the three phases on the primary side may be A, B, C three-phase ac voltages of the primary-side three-phase voltage transformer at the same time.

The amplitude of the two-phase ac voltage applied to the primary side may be determined according to a transformation ratio of the voltage transformer. If the transformation ratio of the voltage transformer is N: 1, applying an alternating current voltage with a rated amplitude of N to the primary side, for example, if the transformation ratio of the voltage transformer is 100: 1, applying 100VAC (100V alternating current) rated voltage on the primary side; and the phase angle of the voltage applied to the primary side is 120 degrees.

The control method of the phase angle and amplitude of the voltage applied to the primary side can control the amplitude and phase angle of the voltage to be applied through PLC control or manual switch control.

And 108, detecting a second group of voltages on the secondary side after the three-phase alternating-current voltage is applied.

The second group of voltages may be voltages between the secondary-side terminals or voltages between the secondary-side terminals and the primary-side three-phase voltages.

The method for detecting the second group of voltages on the secondary side after the three-phase alternating-current voltage is applied can be that after the three-phase alternating-current voltage is applied, the voltage amplitude and the phase angle of a secondary side line are measured through measuring instruments connected in parallel with a secondary side winding.

For example, if the transformation ratio of the voltage transformer is 100: 1, the voltage applied to A, B, C three phases among the three phases on the primary side is 100VAC, the phase angle is 120 degrees, the broken lines are reversed as shown in fig. 5, and when all the connections are normal, the line voltages of any two of the three phases are phase voltages

If the phase B is reversely connected, the line voltages of the phase B and the phase A, C are 1 time of the phase voltage.

If the A, B phases are connected in reverse and the C-phase connection is normal, the line voltages of A, B phases and the C-phase are 1 time of the phase voltage.

And step 110, obtaining a secondary loop polarity detection result according to the first group of voltages and the second group of voltages.

The polarity detection of the secondary circuit may be implemented by applying a three-phase balanced voltage to the primary side of the voltage transformer, or applying two-phase ac voltages (i.e., unbalanced voltages under a simulated single-phase grounding condition) to any two phases of the three phases of the primary side of the voltage transformer, and observing the voltage change between secondary terminals by using vector superposition of line voltages after the line voltages are reversely connected in a three-phase balanced state, and by using the voltage change and the vector superposition of each voltage after the zero-sequence voltage transformer is grounded in a single phase, so as to implement the polarity detection of the secondary circuit of the voltage transformer.

The method for obtaining the secondary loop polarity detection result according to the first group of voltages and the second group of voltages may be to compare the detected first group of voltages and second group of voltages with corresponding preset voltage values, and further obtain different secondary loop polarity detection results according to different comparison results.

In the voltage transformer loop detection method provided in the embodiment, a first group of voltages on a secondary side after two-phase alternating-current voltages are applied are detected by applying two-phase alternating-current voltages to any two of three phases on a primary side; three-phase alternating-current voltage is respectively applied to three phases of a primary side, a second group of voltages of a secondary side after the three-phase alternating-current voltage is applied are detected, and a secondary circuit polarity detection result is obtained according to the first group of voltages and the second group of voltages, so that the efficiency and the quality of secondary circuit detection are improved, and the reliable operation of primary and secondary equipment of a transformer substation is further guaranteed.

Referring to fig. 6, a flowchart of a method for detecting a voltage transformer loop according to an embodiment is shown.

In this embodiment, as shown in fig. 6, the voltage transformer loop detection method further includes steps 602 to 606.

Step 602, single-phase ac voltages are sequentially applied to the three phases on the primary side.

The method of sequentially applying the single-phase ac voltages to the three phases on the primary side may be to sequentially and individually apply the single-phase ac voltages to the phases a, B, and C of the three-phase voltage transformer on the primary side; the specific application sequence of the A phase, the B phase and the C phase can be adjusted.

The amplitude of the single-phase ac voltage applied to the primary side may be determined according to a transformation ratio of the voltage transformer. If the transformation ratio of the voltage transformer is N: 1, applying an alternating voltage with a rated amplitude of N on a primary side; for example, if the transformation ratio of the voltage transformer is 100: 1, a rated voltage of 100VAC (100 v ac) is applied to the primary side.

The control method for the amplitude of the voltage applied to the primary side can control the amplitude of the voltage to be applied through PLC control or manual switching control.

Step 604, detecting a third set of voltages on the secondary side after the single-phase ac voltage is applied.

The third group of voltages may be voltages between terminals of the secondary side.

The method for detecting the third group of voltages on the secondary side after the single-phase alternating-current voltage is applied can be that after the single-phase alternating-current voltage is applied, the voltage amplitude of the secondary side line is measured by a measuring instrument which is connected with the secondary side winding in parallel.

For example, if the transformation ratio of the voltage transformer is 100: 1, sequentially applying single-phase alternating-current voltage of 100VAC to the A phase, the B phase and the C phase in the three phases of the primary side, and under the condition that all the wiring is normal, if the voltage between the terminals of the secondary side is 1VAC, the condition that the circuit between the terminals of the secondary side is normally communicated and the condition that disconnection and virtual connection are not generated is explained; in addition, the accuracy of the transformation ratio of the voltage transformer is also verified.

And 606, acquiring a secondary loop on-off detection result according to the third group of voltages.

The secondary circuit on-off detection can be realized by applying a single-phase alternating current voltage on the primary side of the voltage transformer and detecting whether a corresponding voltage exists between secondary terminals and whether the corresponding amplitude is accurate or not by using the voltage transformation characteristic of the voltage transformer.

The method for obtaining the secondary circuit on-off detection result according to the third group of voltages may be to compare the detected third group of voltages with corresponding preset voltage values, and further obtain different secondary circuit on-off detection results according to different comparison results.

According to the voltage transformer loop detection method provided by the embodiment, the single-phase alternating-current voltage is sequentially applied to the three phases on the primary side, the third group of voltages on the secondary side after the single-phase alternating-current voltage is applied are detected, the on-off detection result of the secondary loop is obtained according to the third group of voltages, and the wiring detection efficiency and quality of the voltage transformer loop are improved.

In one embodiment, a third set of voltages on the secondary side after the single-phase alternating-current voltage is applied is detected by a detection terminal of the secondary circuit detection device; the detection end is connected with the secondary side terminal; the secondary side terminal comprises a plurality of terminals, and any two terminals correspond to a first voltage; the third set of voltages includes a plurality of first voltages. Step 606 includes: when any one first voltage correspondingly meets a first preset value, the circuit between the two terminals corresponding to the first voltage is judged to be normally switched on and off.

The secondary side terminals include a distribution board front compartment voltage terminal, and as shown in fig. 7, the terminal a1, the terminal b1, the terminal c1, the terminal a2, the terminal b2, the terminal c2, and the terminal n are secondary side terminals.

Wherein the first voltage comprises: a first voltage U11 between the terminal a1 and the terminal b1, a first voltage U12 between the terminal b1 and the terminal c1, a first voltage U13 between the terminal a1 and the terminal c1, a first voltage U14 between the terminal a2 and the terminal n, a first voltage U15 between the terminal b2 and the terminal n, and a first voltage U16 between the terminal c2 and the terminal n.

The first preset value may be a preset value of a detection result corresponding to each first voltage pre-stored in the secondary loop detection device.

If the actual detection values of the first voltage U11, the first voltage U12, the first voltage U13, the first voltage U14, the first voltage U15 and the first voltage U16 detected by the detection end of the secondary loop detection equipment meet corresponding first preset values, the loop communication between two terminals corresponding to the first voltage U11, the first voltage U12, the first voltage U13, the first voltage U14, the first voltage U15 and the first voltage U16 is determined to be normal. And when all the first voltages meet the first preset value, all the loops corresponding to the secondary side terminals are normal.

For example, if the transformation ratio of the voltage transformer is 100: 1, when the single-phase ac voltage applied to the a phase among the three phases on the primary side is 100VAC, and all the connections are normal, the first voltage U11 between the terminal a1 and the terminal b1, the first voltage U13 between the terminal a1 and the terminal c1, and the first voltage U14 between the terminal a2 and the terminal n are all 1VAC according to the first preset value, and then, when the actual detected values of the respective first voltages detected by the detection end of the secondary loop detection device satisfy the corresponding first preset values, it is determined that the loop between the terminal a1 and the terminal b1, the loop between the terminal a1 and the terminal c1, and the loop between the terminal a2 and the terminal n are normally connected. When all the first voltages meet the first preset value, the loops corresponding to all the terminals are normal.

When the single-phase alternating voltage applied to the B phase among the three phases on the primary side is 100VAC, and all the connections are normal, the first voltage U11 between the terminal a1 and the terminal B1, the first voltage U12 between the terminal B1 and the terminal c1, and the first voltage U15 between the terminal B2 and the terminal n are all 1VAC according to the first preset value, and then, when the actual detected values of the first voltages detected by the detection end of the secondary loop detection device satisfy the corresponding first preset values, it is determined that the loop between the terminal a1 and the terminal B1, the loop between the terminal B1 and the terminal c1, and the loop between the terminal B2 and the terminal n are normally connected.

When the single-phase ac voltage applied to the C phase among the three phases on the primary side is 100VAC, and all the connections are normal, the first voltage U12 between the terminal b1 and the terminal C1, the first voltage U13 between the terminal a1 and the terminal C1, and the first voltage U16 between the terminal C2 and the terminal n are all 1VAC according to the first preset value, and then, when the actual detected values of the first voltages detected by the detection end of the secondary circuit detection device satisfy the corresponding first preset values, it is determined that the connection between the circuit between the terminal b1 and the terminal C1, the circuit between the terminal a1 and the terminal C1, and the circuit between the terminal C2 and the terminal n is normal.

In one embodiment, the secondary side includes a first pair of windings, a second pair of windings, and a zero sequence winding. Referring to fig. 8, step 110 includes

steps

802 and 804.

And step 802, acquiring a polarity detection result of the first counter winding according to the relation between the second group of voltages and the corresponding preset value.

The first pair of winding polarity detection results may be secondary side terminal polarity detection results after the three-phase ac voltage is applied.

And 804, acquiring polarity detection results of the second pair of windings and the zero sequence winding according to the relation between the first group of voltages and the second group of voltages and the corresponding preset values.

The second opposite winding polarity detection result comprises a secondary side terminal polarity detection result after the two-phase alternating voltage is applied and a secondary side terminal polarity detection result after the three-phase alternating voltage is applied.

In step 110 provided in this embodiment, a first pair of winding polarity detection results is obtained according to a relationship between the second group of voltages and the corresponding preset values; and obtaining polarity detection results of the second pair of windings and the zero-sequence winding according to the relation between the first group of voltages and the second group of voltages and the corresponding preset values, further obtaining polarity detection results of the secondary circuit, and improving the circuit wiring detection efficiency of the voltage transformer.

In one embodiment, the second set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminal comprises a plurality of terminals, and any two terminals correspond to a second voltage; the second set of voltages includes a plurality of second voltages. Step 802 includes: and when the corresponding three second voltages of any three terminals correspondingly meet a second preset value, judging that the polarities of any three terminals are normal.

Wherein the second voltage comprises: a second voltage U21 between terminal a1 and terminal b1, a second voltage U22 between terminal b1 and terminal c1, and a second voltage U23 between terminal a1 and terminal c 1.

The second preset value may be a preset value of a detection result corresponding to each second voltage pre-stored in the secondary loop detection device; and if the actual detection values of the second voltage U21, the second voltage U22 and the second voltage U23 detected by the detection end of the secondary loop detection equipment all meet corresponding second preset values, judging that the loop polarity among the terminal a1, the terminal b1 and the terminal c1 is normal, and further judging that the polarity of the first counter winding is normal.

For example, if the transformation ratio of the voltage transformer is 100: 1, three-phase alternating-current voltage applied to three phases of a primary side is 100VAC, and under the condition that all the wiring is normal, a second voltage U21 between a terminal a1 and a terminal b1, a second voltage U22 between a terminal b1 and a terminal c1, and a second voltage U23 between a terminal a1 and a terminal c1 correspond to second preset values

VAC, and then if the actual detection value of each second voltage detected by the detection end of the secondary circuit detection device satisfies the corresponding second preset value, determining that the polarity of the circuit among the terminal a1, the terminal b1 and the terminal c1 is normal, and further determining that the polarity of the first counter winding is normal.

In step 802 provided in this embodiment, when the three corresponding second voltages in any three terminals all correspond to and satisfy the second preset value, it is determined that the polarities of any three terminals are normal, and then it is determined that the polarity of the first counter winding is normal, so as to obtain a secondary loop polarity detection result, and improve the loop wiring detection efficiency of the voltage transformer.

In one embodiment, the second set of voltages is detected by a detection terminal of the secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminal comprises a plurality of terminals, the plurality of terminals comprise a first terminal and a second terminal, and any two terminals correspond to a second voltage; the second set of voltages comprises a plurality of second voltages; the primary side includes three phases. Referring to fig. 9, step 802 further includes steps 902 through 906.

Step 902, take any one first terminal and two second terminals of the plurality of terminals.

Wherein, the first terminal can be one of the secondary side terminals; the two second terminals may be two terminals other than the first terminal among the secondary side terminals. The secondary side terminals include a distribution board front compartment voltage terminal, and as shown in fig. 7, the terminal a1, the terminal b1, the terminal c1, the terminal a2, the terminal b2, the terminal c2, and the terminal n are secondary side terminals. For example, the terminal a1 is taken as a first terminal, and the terminals b1 and c1 are taken as two second terminals.

Step 904, when the second voltage between the first terminal and any second terminal meets a second preset value, and the second voltage between the two second terminals and the third voltage between the first terminal and one of the phases do not meet the second preset value, it is determined that the first terminal is in reverse polarity connection.

Wherein the third voltage comprises: a voltage U31 between the terminal a1 and the a phase, a voltage U32 between the terminal B1 and the B phase, and a voltage U33 between the terminal C1 and the C phase.

The second preset value may be a preset value of a detection result corresponding to each second voltage and each third voltage pre-stored in the secondary loop detection device.

For example, the terminal a1 is taken as a first terminal, and the terminals b1 and c1 are taken as two second terminals; when the second voltage U21 between the terminal a1 and the terminal b1, the second voltage U23 between the terminal a1 and the terminal c1 satisfy the second preset value, and the second voltage U22 between the terminal b1 and the terminal c1, and the voltage U31 between the terminal a1 and the phase a do not satisfy the second preset value, it is determined that the terminal a1 is reverse-polarity connected.

Step 906, when the second voltage between the first terminal and any second terminal, the third voltage between the first terminal and one of the second terminals meet a second preset value, and the second voltage between the two second terminals does not meet the second preset value, it is determined that the two second terminals are both in reverse polarity connection.

For example, the terminal a1 is taken as a first terminal, and the terminals b1 and c1 are taken as two second terminals; when the second voltage U21 between the terminal a1 and the terminal b1, the second voltage U23 between the terminal a1 and the terminal c1, and the third voltage U31 between the terminal a1 and the a phase satisfy the second preset value, and the second voltage U22 between the terminal b1 and the terminal c1 does not satisfy the second preset value, it is determined that the terminals b1 and c1 are both polarity-reversed.

In step 802 provided in this embodiment, by arbitrarily selecting one first terminal and two second terminals of the plurality of terminals, when a second voltage between the first terminal and any second terminal satisfies a second preset value, and the second voltage between the two second terminals and a third voltage between the first terminal and one of the phases do not satisfy the second preset value, it is determined that the first terminal is in reverse polarity connection; when the second voltage between the first terminal and any second terminal and the third voltage between the first terminal and one of the second terminals meet a second preset value and the second voltage between the two second terminals does not meet the second preset value, the two second terminals are judged to be in reverse polarity connection, and polarity detection of a secondary loop is further achieved.

In one embodiment, a first set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminals comprise a plurality of terminals including a third terminal, a fourth terminal, a fifth terminal and a sixth terminal; the first group of voltages comprises a plurality of fourth voltages, and one fourth voltage corresponds to any two terminals; the second set of voltages includes a plurality of fifth voltages, one fifth voltage corresponding to any two terminals. Referring to fig. 10, step 804 further includes steps 1002 to 1006.

Step 1002, arbitrarily take a third terminal, a fourth terminal, two fifth terminals and a sixth terminal from the plurality of terminals.

Wherein, the third terminal may be one of the secondary side terminals; a fourth terminal which may be one of the secondary side terminals except for the third terminal; two fifth terminals, which may be two terminals except for the third terminal and the fourth terminal among the secondary side terminals; the sixth terminal may be one of the secondary side terminals except for the third terminal, the fourth terminal, and the fifth terminal.

The secondary side terminals include a distribution board front compartment voltage terminal, and as shown in fig. 7, the terminal a1, the terminal b1, the terminal c1, the terminal a2, the terminal b2, the terminal c2, and the terminal n are secondary side terminals. For example, the terminal a1 is taken as a third terminal, the terminal a2 is taken as a fourth terminal, the terminals b2 and c2 are taken as two fifth terminals, and the terminal n is taken as a sixth terminal.

Step 1004, when a fourth voltage between any fifth terminal and any sixth terminal meets a third preset value, and the fourth voltage between the fourth terminal and the sixth terminal and the fifth voltage between the third terminal and the fourth terminal do not meet the third preset value, determining that the fourth terminal is in reverse polarity connection.

Wherein the fourth voltage comprises: a fourth voltage U41 between terminal a2 and terminal n, a fourth voltage U42 between terminal b2 and terminal n, and a fourth voltage U43 between terminal c2 and terminal n; the fifth voltage, may be a fifth voltage U51 between terminal a1 and terminal a2, a fifth voltage U52 between terminal b1 and terminal b2, and a fifth voltage U53 between terminal c1 and terminal c 2.

The third preset value may be a preset value of a detection result corresponding to each fourth voltage and each fifth voltage pre-stored in the secondary loop detection device.

If the terminal a1 is taken as a third terminal, the terminal a2 is taken as a fourth terminal, the terminals b2 and c2 are taken as two fifth terminals, and the terminal n is taken as a sixth terminal; when the fourth voltage U42 between the terminal b2 and the terminal n, the fourth voltage U43 between the terminal c2 and the terminal n satisfy the third preset value, and none of the fourth voltage U41 between the terminal a2 and the terminal n, and the fifth voltage U51 between the terminal a1 and the terminal a2 satisfy the third preset value, the terminal a2 is determined to be reverse polarity.

If the terminal b1 is taken as the third terminal, the terminal b2 is taken as the fourth terminal, the terminals a2 and c2 are taken as two fifth terminals, and the terminal n is taken as the sixth terminal; when the fourth voltage U41 between the terminal a2 and the terminal n, the fourth voltage U43 between the terminal c2 and the terminal n satisfy the third preset value, and none of the fourth voltage U42 between the terminal b2 and the terminal n, and the fifth voltage U52 between the terminal b1 and the terminal b2 satisfy the third preset value, the terminal b2 is determined to be reverse polarity.

If the terminal c1 is taken as the third terminal, the terminal c2 is taken as the fourth terminal, the terminals a2 and b2 are taken as two fifth terminals, and the terminal n is taken as the sixth terminal; when the fourth voltage U43 between the terminal c2 and the terminal n, the fourth voltage U42 between the terminal b2 and the terminal n satisfy the third preset value, and none of the fourth voltage U41 between the terminal c2 and the terminal n, and the fifth voltage U53 between the terminal c1 and the terminal c2 satisfy the third preset value, it is determined that the terminal c2 is reverse-polarity-connected.

Step 1006, when a fourth voltage between any fifth terminal and any sixth terminal, and a fifth voltage between any third terminal and any fourth terminal satisfy a third preset value, and a fourth voltage between any fourth terminal and any sixth terminal does not satisfy the third preset value, it is determined that both the two fifth terminals and the zero-sequence winding are in reverse polarity connection.

If the terminal a1 is taken as a third terminal, the terminal a2 is taken as a fourth terminal, the terminals b2 and c2 are taken as two fifth terminals, and the terminal n is taken as a sixth terminal; when the fourth voltage U42 between the terminal b2 and the terminal n, the fourth voltage U43 between the terminal c2 and the terminal n, the fifth voltage U51 between the terminal a1 and the terminal a2 satisfy the third preset value, and the fourth voltage U41 between the terminal a2 and the terminal n does not satisfy the third preset value, it is determined that the terminal b2, the terminal c2, and the zero-sequence winding are all in reverse polarity connection.

If the terminal b1 is taken as the third terminal, the terminal b2 is taken as the fourth terminal, the terminals a2 and c2 are taken as two fifth terminals, and the terminal n is taken as the sixth terminal; when the fourth voltage U41 between the terminal a2 and the terminal n, the fourth voltage U43 between the terminal c2 and the terminal n, the fifth voltage U52 between the terminal b1 and the terminal b2 satisfy the third preset value, and the fourth voltage U42 between the terminal b2 and the terminal n does not satisfy the third preset value, it is determined that the terminal a2, the terminal c2, and the zero-sequence winding are all polarity-reversed.

If the terminal c1 is taken as the third terminal, the terminal c2 is taken as the fourth terminal, the terminals a2 and b2 are taken as two fifth terminals, and the terminal n is taken as the sixth terminal; when the fourth voltage U43 between the terminal c2 and the terminal n, the fourth voltage U42 between the terminal b2 and the terminal n, the fifth voltage U53 between the terminal c1 and the terminal c2 satisfy the third preset value, and the fourth voltage U41 between the terminal c2 and the terminal n does not satisfy the third preset value, it is determined that the terminal a2, the terminal b2, and the zero-sequence winding are all in reverse polarity connection.

In step 804 provided in this embodiment, by arbitrarily selecting one third terminal, one fourth terminal, two fifth terminals, and one sixth terminal from the plurality of terminals, when a fourth voltage between any fifth terminal and any sixth terminal meets a third preset value, and neither the fourth voltage between the fourth terminal and the sixth terminal nor the fifth voltage between the third terminal and the fourth terminal meets the third preset value, it is determined that the fourth terminal is in reverse polarity connection; when the fourth voltage between any fifth terminal and any sixth terminal and the fifth voltage between any third terminal and any fourth terminal meet a third preset value and the fourth voltage between any fourth terminal and any fourth terminal does not meet the third preset value, it is determined that the two fifth terminals and the zero-sequence winding are in reverse polarity connection, polarity detection of a secondary circuit is achieved, and detection efficiency of the secondary circuit of the voltage transformer is improved.

In one embodiment, a first set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminals comprise a plurality of terminals including a third terminal, a fourth terminal, a fifth terminal and a sixth terminal; the first group of voltages comprises a plurality of fourth voltages, and one fourth voltage corresponds to any two terminals; the second set of voltages includes a plurality of fifth voltages, one fifth voltage corresponding to any two terminals. Referring to fig. 11, step 804 further includes steps 1102 to 1106.

Step 1102, arbitrarily take a third terminal, a fourth terminal, two fifth terminals, and a sixth terminal of the plurality of terminals.

In this embodiment, step 1102 corresponds to step 1002 in the above embodiment, and is not described herein again.

In step 1104, when the fourth voltage between any fifth terminal and any sixth terminal does not satisfy the third preset value, and the fourth voltage between the fourth terminal and any sixth terminal, and the fifth voltage between any third terminal and any fourth terminal satisfy the third preset value, it is determined that both the fifth terminals are in reverse polarity connection.

Wherein the fourth voltage comprises: a fourth voltage U41 between terminal a2 and terminal n, a fourth voltage U42 between terminal b2 and terminal n, and a fourth voltage U43 between terminal c2 and terminal n; the fifth voltage includes: a fifth voltage U51 between terminal a1 and terminal a2, a fifth voltage U52 between terminal b1 and terminal b2, and a fifth voltage U53 between terminal c1 and terminal c 2.

If the terminal a1 is taken as a third terminal, the terminal a2 is taken as a fourth terminal, the terminals b2 and c2 are taken as two fifth terminals, and the terminal n is taken as a sixth terminal; when the fourth voltage U42 between the terminal b2 and the terminal n and the fourth voltage U43 between the terminal c2 and the terminal n do not satisfy the third preset value, and the fourth voltage U41 between the terminal a2 and the terminal n and the fifth voltage U51 between the terminal a1 and the terminal a2 satisfy the third preset value, it is determined that the terminals b2 and c2 are both polarity-reversed.

If the terminal b1 is taken as the third terminal, the terminal b2 is taken as the fourth terminal, the terminals a2 and c2 are taken as two fifth terminals, and the terminal n is taken as the sixth terminal; when the fourth voltage U41 between the terminal a2 and the terminal n and the fourth voltage U43 between the terminal c2 and the terminal n do not satisfy the third preset value, and the fourth voltage U42 between the terminal b2 and the terminal n and the fifth voltage U52 between the terminal b1 and the terminal b2 all satisfy the third preset value, it is determined that the terminals a2 and c2 are both polarity-reversed.

If the terminal c1 is taken as the third terminal, the terminal c2 is taken as the fourth terminal, the terminals a2 and b2 are taken as two fifth terminals, and the terminal n is taken as the sixth terminal; when the fourth voltage U43 between the terminal c2 and the terminal n and the fourth voltage U42 between the terminal b2 and the terminal n do not satisfy the third preset value, and the fourth voltage U41 between the terminal c2 and the terminal n and the fifth voltage U53 between the terminal c1 and the terminal c2 all satisfy the third preset value, it is determined that the terminals a2 and b2 are both in reverse polarity connection.

In step 1106, when the fourth voltage between any fifth terminal and any sixth terminal and the fifth voltage between any third terminal and any fourth terminal do not satisfy the third preset value, and the fourth voltage between any fourth terminal and any sixth terminal satisfies the third preset value, it is determined that the fourth terminal and the zero-sequence winding are both in reverse polarity connection.

If the terminal a1 is taken as a third terminal, the terminal a2 is taken as a fourth terminal, the terminals b2 and c2 are taken as two fifth terminals, and the terminal n is taken as a sixth terminal; when the fourth voltage U42 between the terminal b2 and the terminal n, the fourth voltage U43 between the terminal c2 and the terminal n, and the fifth voltage U51 between the terminal a1 and the terminal a2 all satisfy the third preset value, and the fourth voltage U41 between the terminal a2 and the terminal n satisfies the third preset value, it is determined that the terminals a2 and the zero-sequence winding are both in reverse polarity connection.

If the terminal b1 is taken as the third terminal, the terminal b2 is taken as the fourth terminal, the terminals a2 and c2 are taken as two fifth terminals, and the terminal n is taken as the sixth terminal; when the fourth voltage U41 between the terminal a2 and the terminal n, the fourth voltage U43 between the terminal c2 and the terminal n, and the fifth voltage U52 between the terminal b1 and the terminal b2 all satisfy the third preset value, and the fourth voltage U42 between the terminal b2 and the terminal n satisfies the third preset value, it is determined that the terminals b2 and the zero-sequence winding are both in reverse polarity connection.

If the terminal c1 is taken as the third terminal, the terminal c2 is taken as the fourth terminal, the terminals a2 and b2 are taken as two fifth terminals, and the terminal n is taken as the sixth terminal; when the fourth voltage U43 between the terminal c2 and the terminal n, the fourth voltage U42 between the terminal b2 and the terminal n, and the fifth voltage U53 between the terminal c1 and the terminal c2 all satisfy the third preset value, and the fourth voltage U41 between the terminal c2 and the terminal n satisfies the third preset value, it is determined that the terminals c2 and the zero-sequence winding are both in reverse polarity connection.

In step 804 provided in this embodiment, by arbitrarily selecting one third terminal, one fourth terminal, two fifth terminals, and one sixth terminal from the plurality of terminals, when a fourth voltage between any fifth terminal and any sixth terminal does not satisfy a third preset value, and a fourth voltage between the fourth terminal and the sixth terminal, and a fifth voltage between the third terminal and the fourth terminal satisfy the third preset value, it is determined that both the two fifth terminals are in reverse polarity connection; when the fourth voltage between any fifth terminal and any sixth terminal and the fifth voltage between any third terminal and any fourth terminal do not meet a third preset value, and the fourth voltage between any fourth terminal and any sixth terminal meets a third preset value, it is determined that the fourth terminal and the zero-sequence winding are in reverse polarity connection, polarity detection of the secondary side terminal and the zero-sequence winding is achieved, and detection efficiency of a secondary circuit of the voltage transformer is improved.

In one embodiment, a first set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminals comprise a plurality of terminals including a third terminal, a fourth terminal, a fifth terminal and a sixth terminal; the first group of voltages comprises a plurality of fourth voltages, and one fourth voltage corresponds to any two terminals; the second set of voltages includes a plurality of fifth voltages, one fifth voltage corresponding to any two terminals. Referring to fig. 12, step 804 further includes steps 1202 to 1206.

Step 1202, arbitrarily take a third terminal, a fourth terminal, two fifth terminals and a sixth terminal from the plurality of terminals.

In this embodiment, step 1202 corresponds to step 1002 in the above embodiment, and is not described herein again.

Step 1204, when the fourth voltage between the fourth terminal and the sixth terminal, the fourth voltage between any fifth terminal and the sixth terminal, and the fifth voltage between the third terminal and the fourth terminal do not satisfy the third preset value, it is determined that the fourth terminal and the two fifth terminals are both in reverse polarity connection.

Wherein the fourth voltage comprises: a fourth voltage U41 between terminal a2 and terminal n, a fourth voltage U42 between terminal b2 and terminal n, and a fourth voltage U43 between terminal c2 and terminal n; the fifth voltage, may be the fifth voltage U51 between terminal a1 and terminal a 2.

If the terminal a1 is taken as a third terminal, the terminal a2 is taken as a fourth terminal, the terminals b2 and c2 are taken as two fifth terminals, and the terminal n is taken as a sixth terminal; when the fourth voltage U41 between the terminal a2 and the terminal n, the fourth voltage U42 between the terminal b2 and the terminal n, the fourth voltage U43 between the terminal c2 and the terminal n, and the fifth voltage U51 between the terminal a1 and the terminal a2 all satisfy the third preset value, it is determined that the terminal a2, the terminal b2, and the terminal c2 are all polarity-reversed.

In step 1206, when the fourth voltage between the fourth terminal and the sixth terminal and the fourth voltage between any fifth terminal and the sixth terminal do not satisfy the third preset value, and the fifth voltage between the third terminal and the fourth terminal satisfies the third preset value, it is determined that the zero-sequence winding is in reverse polarity connection.

If the terminal a1 is taken as a third terminal, the terminal a2 is taken as a fourth terminal, the terminals b2 and c2 are taken as two fifth terminals, and the terminal n is taken as a sixth terminal; and when the fourth voltage U41 between the terminal a2 and the terminal n, the fourth voltage U42 between the terminal b2 and the terminal n, and the fourth voltage U43 between the terminal c2 and the terminal n all meet a third preset value, and the fifth voltage U51 between the terminal a1 and the terminal a2 meets the third preset value, determining that the zero-sequence winding is in reverse polarity connection.

In step 804 provided in this embodiment, by arbitrarily selecting one third terminal, one fourth terminal, two fifth terminals, and one sixth terminal from the plurality of terminals, when a fourth voltage between the fourth terminal and the sixth terminal, a fourth voltage between any fifth terminal and the sixth terminal, and a fifth voltage between the third terminal and the fourth terminal do not satisfy a third preset value, it is determined that the fourth terminal and the two fifth terminals are both in reverse polarity connection; when the fourth voltage between the fourth terminal and the sixth terminal and the fourth voltage between any fifth terminal and the sixth terminal do not meet a third preset value and the fifth voltage between the third terminal and the fourth terminal meets a third preset value, the zero-sequence winding is judged to be in reverse polarity connection, polarity detection of the secondary side terminal and the zero-sequence winding is achieved, and detection efficiency of the secondary circuit of the voltage transformer is improved.

In one embodiment, a first set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminals comprise a plurality of terminals including a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal, and a ninth terminal; the first group of voltages comprises a plurality of fourth voltages, and any two terminals correspond to one fourth voltage; the second set of voltages includes a plurality of fifth voltages, one for any two terminals. Referring to fig. 13, step 804 includes steps 1302 to 1306.

Step 1302, arbitrarily take a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal, and a ninth terminal of the plurality of terminals.

Wherein, the third terminal may be one of the secondary side terminals; a fourth terminal which may be one of the secondary side terminals except for the third terminal; one fifth terminal, which may be one of the secondary side terminals except for the third terminal and the fourth terminal; a sixth terminal which may be one of the secondary side terminals except for the third, fourth, and fifth terminals; a seventh terminal that may be one of the secondary side terminals except for the third, fourth, fifth, and sixth terminals; an eighth terminal that may be one of the secondary side terminals except for the third, fourth, fifth, sixth, and seventh terminals; the ninth terminal may be one of the secondary side terminals except for the third, fourth, fifth, sixth, seventh and eighth terminals.

The secondary side terminals include a distribution board front compartment voltage terminal, and as shown in fig. 7, the terminal a1, the terminal b1, the terminal c1, the terminal a2, the terminal b2, the terminal c2, and the terminal n are secondary side terminals. For example, the terminal a1 is taken as a third terminal, the terminal b1 is taken as a fourth terminal, the terminal c1 is taken as a fifth terminal, the terminal a2 is taken as a sixth terminal, the terminal b2 is taken as a seventh terminal, the terminal c2 is taken as an eighth terminal, and the terminal n is taken as a ninth terminal.

In step 1304, when a fourth voltage between any of the three terminals, i.e., the sixth terminal, the seventh terminal, and the eighth terminal, and the ninth terminal all satisfy a third preset value, and a fifth voltage between the third terminal and the sixth terminal, a fifth voltage between the fourth terminal and the seventh terminal, and a fifth voltage between the fifth terminal and the eighth terminal all satisfy the third preset value, it is determined that the polarities of the sixth terminal, the seventh terminal, the eighth terminal, and the zero-sequence winding are normal.

If the terminal a1 is taken as the third terminal, the terminal b1 is taken as the fourth terminal, the terminal c1 is taken as the fifth terminal, the terminal a2 is taken as the sixth terminal, the terminal b2 is taken as the seventh terminal, the terminal c2 is taken as the eighth terminal, and the terminal n is taken as the ninth terminal; when the fourth voltage between any of the three terminals, namely the terminal a2, the terminal b2 and the terminal c2, and the terminal n all satisfy the third preset value, and the fifth voltage between the terminal a1 and the terminal a2, the fifth voltage between the terminal b1 and the terminal b2, and the fifth voltage between the terminal c1 and the terminal c2 all satisfy the third preset value, it is determined that the polarity of the terminal a2, the terminal b2, the terminal c2 and the zero-sequence winding is normal.

Step 1306, when a fourth voltage between any of the sixth terminal, the seventh terminal, and the eighth terminal and the ninth terminal meets a third preset value, and a fifth voltage between the third terminal and the sixth terminal, a fifth voltage between the fourth terminal and the seventh terminal, and a fifth voltage between the fifth terminal and the eighth terminal do not meet the third preset value, it is determined that the sixth terminal, the seventh terminal, the eighth terminal, and the zero-sequence winding are all reversely connected in polarity.

If the terminal a1 is taken as the third terminal, the terminal b1 is taken as the fourth terminal, the terminal c1 is taken as the fifth terminal, the terminal a2 is taken as the sixth terminal, the terminal b2 is taken as the seventh terminal, the terminal c2 is taken as the eighth terminal, and the terminal n is taken as the ninth terminal; when the fourth voltage between any of the three terminals, namely the terminal a2, the terminal b2 and the terminal c2, and the terminal n all satisfy the third preset value, and the fifth voltage between the terminal a1 and the terminal a2, the fifth voltage between the terminal b1 and the terminal b2, and the fifth voltage between the terminal c1 and the terminal c2 do not satisfy the third preset value, it is determined that the terminal a2, the terminal b2, the terminal c2 and the zero-sequence winding are all in reverse polarity connection.

In step 804 provided in this embodiment, by arbitrarily taking a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal, and a ninth terminal from among the plurality of terminals, when a fourth voltage between any of the three terminals of the sixth terminal, the seventh terminal, and the eighth terminal and the ninth terminal all satisfy a third preset value, and a fifth voltage between the third terminal and the sixth terminal, a fifth voltage between the fourth terminal and the seventh terminal, and a fifth voltage between the fifth terminal and the eighth terminal all satisfy the third preset value, it is determined that the polarities of the sixth terminal, the seventh terminal, the eighth terminal, and the zero-sequence winding are all normal; when the fourth voltage between any of the three terminals of the sixth terminal, the seventh terminal and the eighth terminal and the ninth terminal all satisfy the third preset value, and the fifth voltage between the third terminal and the sixth terminal, the fifth voltage between the fourth terminal and the seventh terminal and the fifth voltage between the fifth terminal and the eighth terminal all do not satisfy the third preset value, it is determined that the sixth terminal, the seventh terminal, the eighth terminal and the zero-sequence winding are all in reverse polarity connection, secondary loop polarity detection is achieved, and secondary loop detection efficiency is improved.

It should be understood that although the various steps in the flowcharts of fig. 1, 6 and 8-13 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1, 6, and 8-13 may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps. It should be noted that the different embodiments described above may be combined with each other.

Referring to fig. 14, a block diagram of a system for detecting a voltage transformer loop in an embodiment is shown.

In this embodiment, each module is used to execute each step in the corresponding embodiment in fig. 1, and specific reference is made to fig. 1 and the related description in the corresponding embodiment in fig. 1, which are not repeated herein.

In this embodiment, the voltage transformer loop detection system includes a first input module 1402, a first detection module 1404, a second input module 1406, a second detection module 1408, and an acquisition module 1410.

The first input module 1402 is configured to apply a two-phase ac voltage to any two of the three phases on the primary side.

The first detecting module 1404 detects a first set of voltages on the secondary side after the two-phase alternating voltage is applied.

And a second input module 1406 for applying three-phase ac voltages to the three phases on the primary side, respectively.

A second detecting module 1408 for detecting a second set of voltages on the secondary side after the three-phase ac voltage is applied.

The obtaining module 1410 is configured to obtain a secondary loop polarity detection result according to the first group of voltages and the second group of voltages.

In the voltage transformer loop detection system provided in this embodiment, a first input module 1402 applies a two-phase ac voltage to any two of three phases on a primary side, and a first detection module 1404 detects a first set of voltages on a secondary side after the two-phase ac voltage is applied; the second input module 1406 applies three-phase alternating-current voltages to three phases of the primary side respectively, the second detection module 1408 detects a second group of voltages on the secondary side after the three-phase alternating-current voltages are applied, and the acquisition module 1410 acquires a secondary circuit polarity detection result according to the first group of voltages and the second group of voltages, so that the efficiency and quality of secondary circuit detection are improved, and reliable operation of primary and secondary equipment of the transformer substation is further guaranteed.

Fig. 15 is a block diagram of a voltage transformer loop detection system according to an embodiment.

In this embodiment, each module is configured to execute each step in the embodiment corresponding to fig. 6, and specific reference is made to fig. 6 and the related description in the embodiment corresponding to fig. 6, which are not repeated herein.

In this embodiment, the voltage transformer loop detection system includes a third input module 1502, a third detection module 1504, and an on-off acquisition module 1506.

And a third input module 1502 for sequentially applying single-phase ac voltages to the three phases on the primary side.

And a third detecting module 1504 for detecting a third set of voltages on the secondary side after the single-phase ac voltage is applied.

And the on-off acquisition module 1506 is used for acquiring an on-off detection result of the secondary circuit according to the third group of voltages.

In the voltage transformer loop detection system provided in this embodiment, a single-phase alternating voltage is sequentially applied to three phases on a primary side through the third input module 1502, the third detection module 1504 detects a third group of voltages on a secondary side after the single-phase alternating voltage is applied, and the on-off acquisition module 1506 acquires an on-off detection result of a secondary loop according to the third group of voltages, so that the wiring detection efficiency and quality of the voltage transformer loop are improved.

The division of each module in the voltage transformer loop detection system is only used for illustration, and in other embodiments, the voltage transformer loop detection system may be divided into different modules as needed to complete all or part of the functions of the voltage transformer loop detection system.

For specific limitations of the voltage transformer loop detection system, reference may be made to the above limitations of the voltage transformer loop detection method, which are not described herein again. All or part of each module in the voltage transformer loop detection system can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

An embodiment of the present application further provides a computer device, which includes a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor is enabled to execute the steps of the method in the foregoing embodiments.

The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of the voltage transformer loop detection method.

When the voltage transformer secondary circuit detection is carried out, the voltage transformer circuit detection method and the voltage transformer circuit detection system provided by the embodiment obtain the secondary circuit polarity detection and on-off detection results, improve the voltage transformer circuit wiring detection efficiency and quality, further guarantee the reliable operation of primary and secondary equipment of a transformer substation, and have important economic value and popularization and practice value.

Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and bus dynamic RAM (RDRAM).

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A voltage transformer loop detection method is characterized in that the voltage transformer comprises a primary side and a secondary side; the detection method comprises the following steps:

2. The method of claim 1, further comprising:

sequentially applying single-phase alternating-current voltages to the three phases on the primary side;

detecting a third group of voltages on the secondary side after the single-phase alternating-current voltage is applied;

and acquiring a secondary loop on-off detection result according to the third group of voltages.

3. The method according to claim 2, characterized in that a third group of voltages on the secondary side after the single-phase alternating-current voltage is applied is detected by a detection terminal of a secondary circuit detection device; the detection end is connected with the secondary side terminal; the secondary side terminal comprises a plurality of terminals, and any two terminals correspond to a first voltage; the third set of voltages comprises a plurality of the first voltages;

the obtaining of the secondary loop on-off detection result according to the third group of voltages comprises:

and when any one first voltage correspondingly meets a first preset value, judging that the loop between the two terminals corresponding to the first voltage is normally switched on and off.

4. The method of claim 1, wherein the secondary side comprises a first pair of windings, a second pair of windings, and a zero sequence winding, and wherein obtaining the secondary loop polarity detection result according to the first set of voltages and the second set of voltages comprises:

obtaining a polarity detection result of the first counter winding according to the relation between the second group of voltages and corresponding preset values;

and obtaining the polarity detection results of the second pair of windings and the zero-sequence winding according to the relationship between the first group of voltages and the second group of voltages and corresponding preset values.

5. The method of claim 4, wherein the second set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminal comprises a plurality of terminals, and any two terminals correspond to a second voltage; the second set of voltages comprises a plurality of the second voltages;

the obtaining of the first counter winding polarity detection result according to the relationship between the second group of voltages and the corresponding preset values includes:

and when the corresponding three second voltages of any three terminals correspondingly meet a second preset value, judging that the polarities of any three terminals are normal.

6. The method of claim 4, wherein the second set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminal comprises a plurality of terminals, the plurality of terminals comprise a first terminal and a second terminal, and any two terminals correspond to a second voltage; the second set of voltages comprises a plurality of the second voltages; the primary side comprises three phases;

the obtaining the first counter winding polarity detection result according to the relationship between the second group of voltages and the corresponding preset value further includes:

one of the first terminals and two of the second terminals are arbitrarily taken from the plurality of terminals;

when the second voltage between the first terminal and any second terminal meets a second preset value, and the second voltage between the two second terminals and the third voltage between the first terminal and one of the phases do not meet the second preset value, judging that the first terminal is in reverse polarity connection;

and when the second voltage between the first terminal and any second terminal, the third voltage between the first terminal and one of the interphase meets the second preset value, and the second voltage between the two second terminals does not meet the second preset value, determining that the two second terminals are in reverse polarity connection.

7. The method of claim 4, wherein the first set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminals comprise a plurality of terminals including a third terminal, a fourth terminal, a fifth terminal, and a sixth terminal; the first set of voltages comprises a plurality of fourth voltages, one of the fourth voltages corresponding to any two of the terminals; the second set of voltages comprises a plurality of fifth voltages, one of the fifth voltages corresponding to any two of the terminals;

the obtaining of the polarity detection results of the second pair of windings and the zero-sequence winding according to the relationship between the first group of voltages and the second group of voltages and the corresponding preset values includes:

one of the third terminal, one of the fourth terminal, two of the fifth terminals, and one of the sixth terminals among the plurality of terminals is arbitrarily taken;

when the fourth voltage between any fifth terminal and the sixth terminal meets a third preset value, and the fourth voltage between the fourth terminal and the sixth terminal and the fifth voltage between the third terminal and the fourth terminal do not meet the third preset value, determining that the fourth terminal is in reverse polarity connection;

when the fourth voltage between any fifth terminal and the sixth terminal, the fifth voltage between the third terminal and the fourth terminal satisfy the third preset value, and the fourth voltage between the fourth terminal and the sixth terminal does not satisfy the third preset value, it is determined that both the fifth terminals and the zero-sequence winding are in reverse polarity connection.

8. The method of claim 4, wherein the first set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminals comprise a plurality of terminals including a third terminal, a fourth terminal, a fifth terminal, and a sixth terminal; the first set of voltages comprises a plurality of fourth voltages, one of the fourth voltages corresponding to any two of the terminals; the second set of voltages comprises a plurality of fifth voltages, one of the fifth voltages corresponding to any two of the terminals;

the obtaining of the polarity detection results of the second pair of windings and the zero-sequence winding according to the relationship between the first group of voltages and the second group of voltages and the corresponding preset values further includes:

when the fourth voltage between any fifth terminal and the sixth terminal does not meet a third preset value, and the fourth voltage between the fourth terminal and the sixth terminal and the fifth voltage between the third terminal and the fourth terminal meet the third preset value, determining that the two fifth terminals are in reverse polarity connection;

when the fourth voltage between any fifth terminal and the sixth terminal and the fifth voltage between the third terminal and the fourth terminal do not satisfy a third preset value, and the fourth voltage between the fourth terminal and the sixth terminal satisfies the third preset value, it is determined that the fourth terminal and the zero-sequence winding are both in reverse polarity connection.

9. The method of claim 4, wherein the first set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminals comprise a plurality of terminals including a third terminal, a fourth terminal, a fifth terminal, and a sixth terminal; the first set of voltages comprises a plurality of fourth voltages, one of the fourth voltages corresponding to any two of the terminals; the second set of voltages comprises a plurality of fifth voltages, one of the fifth voltages corresponding to any two of the terminals;

when the fourth voltage between the fourth terminal and the sixth terminal, the fourth voltage between any fifth terminal and the sixth terminal, and the fifth voltage between the third terminal and the fourth terminal do not satisfy a third preset value, determining that the polarity of the fourth terminal and the polarity of the two fifth terminals are reverse connection;

and when the fourth voltage between the fourth terminal and the sixth terminal and the fourth voltage between any fifth terminal and the sixth terminal do not satisfy the third preset value, and the fifth voltage between the third terminal and the fourth terminal satisfies the third preset value, determining that the zero-sequence winding is in reverse polarity connection.

10. The method of claim 4, wherein the first set of voltages is detected by a detection terminal of a secondary loop detection device; the detection end is connected with the secondary side terminal; the secondary side terminals comprise a plurality of terminals including a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal, and a ninth terminal; the first set of voltages comprises a plurality of fourth voltages, one fourth voltage corresponding to any two of the terminals; the second group of voltages comprises a plurality of fifth voltages, and any two terminals correspond to one fifth voltage;

one of the third terminal, one of the fourth terminal, one of the fifth terminal, one of the sixth terminal, one of the seventh terminal, one of the eighth terminal, and one of the ninth terminal among the plurality of terminals is arbitrarily taken;

when the fourth voltage between any of the three terminals of the sixth terminal, the seventh terminal and the eighth terminal and the ninth terminal all satisfy a third preset value, and the fifth voltage between the third terminal and the sixth terminal, the fifth voltage between the fourth terminal and the seventh terminal and the fifth voltage between the fifth terminal and the eighth terminal all satisfy the third preset value, it is determined that the polarities of the sixth terminal, the seventh terminal, the eighth terminal and the zero-sequence winding are normal;

when the fourth voltage between any of the three terminals of the sixth terminal, the seventh terminal, and the eighth terminal and the ninth terminal all satisfy the third preset value, and the fifth voltage between the third terminal and the sixth terminal, the fifth voltage between the fourth terminal and the seventh terminal, and the fifth voltage between the fifth terminal and the eighth terminal do not satisfy the third preset value, it is determined that the sixth terminal, the seventh terminal, the eighth terminal, and the zero-sequence winding are all reversely connected in polarity.

11. A voltage transformer loop detection system is characterized in that a voltage transformer comprises a primary side and a secondary side; the detection system comprises:

12. A computer arrangement comprising a memory and a processor, the memory having stored thereon a computer program that, when executed by the processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 10.

13. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 10.