CN111337750A - Method and device for synchronously testing direct resistance of three-phase winding of cable outgoing type transformer - Google Patents
Method and device for synchronously testing direct resistance of three-phase winding of cable outgoing type transformer Download PDFInfo
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Abstract
The application relates to the technical field of transformers, in particular to a method and a device for synchronously testing direct resistance of three-phase windings of a cable outgoing type transformer, wherein the method comprises the following steps: connecting the connecting point of the transformer neutral point sleeve with the connecting point of the cable armor layer at the outlet side of the transformer based on a first direct resistance test wire; connecting a neutral point test port of the direct resistance tester with an inlet cable armor layer of the transformer based on a second direct resistance test wire; respectively connecting a three-phase winding connection point of the transformer with a three-phase test port of the direct resistance tester based on a three-phase test wire; and synchronously measuring the three-phase direct resistance value of the transformer by the direct resistance tester. The direct resistance tester is used for synchronously measuring the direct resistance values of the three windings of the transformer, so that the winding hidden danger of the main transformer can be found in time, a basis is provided for developing defect elimination work and formulating equipment maintenance strategies, and the overall operation and maintenance cost of the power system is effectively reduced.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a method and a device for synchronously testing direct resistance of three-phase windings of a cable outgoing type transformer.
Background
The transformer is one of the indispensable elements in the transmission line of the power system, and the safety and reliability of the operation of the transformer seriously affect the safety and reliability of the operation of the power system.
However, the joint of the traditional cable outgoing type main transformer winding joint and the cable joint is generally packaged in an oil tank, and a test pressure point like an open type main transformer sleeve joint cannot be found in field operation. Therefore, the traditional method for testing the direct current resistance of the main transformer winding and the common direct current resistance tester cannot directly measure the direct current resistance of the variable-height and medium-winding side of the cable outgoing type main transformer, so that the cable outgoing type main transformer winding has potential equipment hazards. The potential winding hazards of the main transformers cannot be found in time, so that the transformers are serious in faulty running condition, the potential safety hazards of the transformers cannot be found effectively in time, a basis cannot be provided for development of defect eliminating work and establishment of equipment maintenance strategies, and the overall operation and maintenance cost of a power system is improved.
Disclosure of Invention
Therefore, it is necessary to provide a method and an apparatus for synchronously testing the direct resistance of the three-phase winding of the cable-outlet type transformer, which can synchronously measure the single-phase direct resistance of the three-phase winding of the transformer, in view of the above-mentioned problems in the background art.
One aspect of the present application provides a method for synchronously testing direct resistance of a three-phase winding of a cable outlet type transformer, including:
connecting the connecting point of the transformer neutral point sleeve with the connecting point of the cable armor layer at the outlet side of the transformer based on a first direct resistance test wire;
connecting a neutral point test port of the direct resistance tester with an inlet cable armor layer of the transformer based on a second direct resistance test wire;
respectively connecting a three-phase winding connection point of the transformer with a three-phase test port of the direct resistance tester based on a three-phase test wire;
and synchronously measuring the three-phase direct resistance value of the transformer by the direct resistance tester.
In the method for synchronously testing the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, the connection point of the transformer neutral point sleeve is connected with the connection point of the cable armor layer on the outlet side of the transformer through the first direct resistance test wire, the neutral point test port of the direct resistance tester is connected with the inlet cable armor layer of the transformer through the second direct resistance test wire, the three-phase winding connection point of the transformer is respectively connected with the three-phase test port of the direct resistance tester based on the three-phase test wires, so that the direct resistance value of the three windings of the transformer is synchronously measured by using the direct resistance tester, the winding hidden danger of the main transformer can be timely found, a basis is provided for development of defect elimination work and establishment of equipment maintenance strategies, and the overall operation and maintenance cost of a power system is effectively reduced.
In one embodiment, after the connecting point of the transformer neutral point bushing and the connecting point of the cable armor layer on the outgoing line side of the transformer are connected based on the first direct resistance test line, the method further includes:
respectively acquiring connection points in a main transformer side three-phase winding and ground cutter leading-out connecting plate connecting passage of the transformer as three-phase winding connection points of the transformer; or
And respectively acquiring connection points in connection passages with the high-side three-phase inlet wire casing head of the transformer as three-phase winding connection points of the transformer.
In the method for synchronously testing the direct resistance of the three-phase winding of the cable outgoing type transformer in the embodiment, through analyzing the cable structure, it is found that the conductive core of the cable main body and the external metal-clad layer have better insulation and the conductive performance of the external metal-clad layer is better. Respectively obtaining connection points in a main transformer side three-phase winding and ground knife leading-out connecting plate connection path of a transformer as three-phase winding connection points of the transformer; or respectively acquiring a connection point in a connection path with the high-side three-phase inlet wire casing head of the transformer as a three-phase winding connection point of the transformer. The three-phase test connection point of the direct resistance tester is connected with the three-phase winding connection point of the transformer through a three-phase test wire, so that the three-phase direct resistance value of the transformer can be synchronously measured through the direct resistance tester.
In one embodiment, after the three-phase direct resistance values of the transformer are synchronously measured by the direct resistance tester, the method further includes:
calculating the three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance value;
and judging the direct resistance defect of the transformer based on the three-phase direct resistance unbalance rate.
In the method for synchronously testing the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, the three-phase direct resistance value of the transformer is obtained through synchronous measurement of the direct resistance tester, and the three-phase direct resistance unbalance rate of the transformer can be calculated based on the three-phase direct resistance value. Under the condition that the transformer normally works, the three-phase direct resistance unbalance rate of the three-phase winding of the transformer can be in a certain safety range, otherwise, the three-phase direct resistance unbalance rate is obviously abnormal, and the direct resistance defect of the transformer can be judged by analyzing the three-phase direct resistance unbalance rate.
In one embodiment, after the calculating the three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance value, the method further includes:
and when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range, controlling an alarm device to send out an alarm signal.
In the method for synchronously testing the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, under the condition that the transformer works normally, the three-phase direct resistance unbalance rate of the three-phase winding is within a certain safety range, otherwise, the three-phase direct resistance unbalance rate is obviously abnormal, and by monitoring the three-phase direct resistance unbalance rate of the transformer in real time, when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range, the alarm device is controlled to send out an alarm signal, and related workers are reminded to take corresponding treatment measures to avoid the transformer from generating faults and influencing the normal operation of a power supply system at the output side of the transformer.
In one embodiment, the transformer is a cable outlet transformer for an indoor gas insulated substation or a cable outlet transformer for an indoor open substation.
In one embodiment, the transformer is connected in a three-phase four-wire star shape.
In one embodiment, the first direct resistance test line is a double-ended direct resistance test line.
Another aspect of the present application provides a cable outlet type transformer three-phase winding direct resistance synchronous testing device, including:
the first direct resistance test wire is used for connecting the connecting point of the transformer neutral point sleeve with the connecting point of the cable armor layer on the outgoing line side of the transformer;
the direct resistance tester is used for synchronously measuring the three-phase direct resistance value of the transformer;
the second direct resistance test wire is used for connecting a neutral point test port of the direct resistance tester with an inlet cable armor layer of the transformer;
and the three-phase test wire is used for respectively connecting the three-phase winding connection point of the transformer with the three-phase test port of the direct resistance tester.
In the synchronous testing device for the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, the connection point of the transformer neutral point sleeve is connected with the connection point of the cable armor layer on the outlet side of the transformer through the first direct resistance testing wire, the neutral point testing port of the direct resistance tester is connected with the incoming cable armor layer of the transformer through the second direct resistance testing wire, the three-phase winding connection point of the transformer is respectively connected with the three-phase testing port of the direct resistance tester based on the three-phase testing wires, so that the direct resistance value of the three windings of the transformer is synchronously measured by using the direct resistance tester, the winding hidden danger of the main transformer can be timely found, a basis is provided for development of defect elimination work and establishment of equipment maintenance strategies, and the overall operation and maintenance cost of a power system is effectively reduced.
In one embodiment, the direct resistance synchronous testing device for three-phase windings of the cable outlet type transformer further comprises:
and the control device is connected with the direct resistance tester and used for calculating the three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance value and judging the direct resistance defect of the transformer based on the three-phase direct resistance unbalance rate.
In the synchronous testing device for direct resistance of three-phase windings of the cable outgoing type transformer in the above embodiment, by analyzing the cable structure, it is found that the conductive wire core of the cable main body and the external metal-clad layer have better insulation and the conductive performance of the external metal-clad layer is better. Respectively obtaining connection points in a main transformer side three-phase winding and ground knife leading-out connecting plate connection path of a transformer as three-phase winding connection points of the transformer; or respectively acquiring a connection point in a connection path with the high-side three-phase inlet wire casing head of the transformer as a three-phase winding connection point of the transformer. The three-phase test connection point of the direct resistance tester is connected with the three-phase winding connection point of the transformer through a three-phase test wire, so that the three-phase direct resistance value of the transformer can be synchronously measured through the direct resistance tester.
In one embodiment, the direct resistance synchronous testing device for three-phase windings of the cable outlet type transformer further comprises:
and the alarm device is connected with the control device and used for sending out an alarm signal based on the control of the control device when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range.
In the synchronous testing device for the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, under the condition that the transformer works normally, the three-phase direct resistance unbalance rate of the three-phase winding is within a certain safety range, otherwise, the three-phase direct resistance unbalance rate is obviously abnormal, and by monitoring the three-phase direct resistance unbalance rate of the transformer in real time, when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range, the alarm device is controlled to send out an alarm signal, and related workers are reminded to take corresponding treatment measures in time, so that the transformer is prevented from generating faults and the normal operation of a power supply system on the output side of the transformer is prevented from being influenced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain drawings of other embodiments based on these drawings without any creative effort.
Fig. 1 is a schematic flow chart of a method for synchronously testing direct resistance of three-phase windings of a cable outlet type transformer according to a first embodiment of the present application.
Fig. 2 is a schematic flowchart of a method for synchronously testing direct resistance of three-phase windings of a cable outlet type transformer according to a second embodiment of the present application.
Fig. 3 is a schematic flowchart of a method for synchronously testing direct resistance of three-phase windings of a cable outlet type transformer according to a third embodiment of the present application.
Fig. 4 is a schematic flowchart of a method for synchronously testing direct resistance of three-phase windings of a cable outlet type transformer according to a fourth embodiment of the present application.
Fig. 5 is a schematic diagram illustrating a testing principle of a direct resistance synchronous testing apparatus for three-phase windings of a cable outlet type transformer according to a fifth embodiment of the present application.
Fig. 6 is a schematic diagram illustrating a testing principle of a direct resistance synchronous testing apparatus for three-phase windings of a cable outlet type transformer according to a sixth embodiment of the present application.
Fig. 7 is a schematic diagram illustrating a testing principle of a direct resistance synchronous testing apparatus for three-phase windings of a cable outlet type transformer according to a seventh embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.
Throughout the description of the present application, it is to be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection may be direct or indirect via an intermediate medium, and the connection may be internal to the two components. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In an embodiment of the present application, a method for synchronously testing direct resistance of a three-phase winding of a cable outlet type transformer is provided, which includes the following steps:
Through carrying out the analysis to cable structure, discovery cable main part conductive core has better insulation with outside armor metal layer, and outside metal armor electric conductive property is better, and in actual operation, the cable armor generally can be connected with the three-phase winding of transformer through ground connection terminal board flexible connecting wire, or the transformer housing can be connected with ground connection terminal board flexible connecting wire with ground connection. The connection point of the transformer neutral point sleeve pipe and the connection point of the cable armor layer on the outgoing line side of the transformer can be connected through the first direct resistance test wire, and then the connection point of the transformer neutral point can be obtained from the incoming line cable armor layer of the transformer, so that the problem that the connection point of the transformer neutral point is difficult to obtain is solved.
And 204, connecting a neutral point test port of the direct resistance tester with an inlet cable armor layer of the transformer based on a second direct resistance test line.
The connection point of the transformer neutral point sleeve is connected with the connection point of the cable armor layer on the outgoing line side of the transformer through the first direct resistance test wire, so that the metal armor layer has better conductivity, and the connection point communicated with the transformer neutral point can be obtained from the incoming cable armor layer of the transformer close to the ground. And connecting a neutral point test port of the direct resistance tester with an inlet cable armor layer of the transformer through a second direct resistance test wire, namely communicating with the neutral point of the transformer through the second direct resistance test wire.
And step 206, respectively connecting the three-phase winding connection point of the transformer with the three-phase test port of the direct resistance tester based on the three-phase test wires.
Through carrying out the analysis to the cable structure, it is connected with the three-phase winding of transformer to discover cable armor generally can be through ground connection terminal strip flexible connecting wire, or transformer housing can be connected with ground connection terminal strip flexible connecting wire with ground connection. Respectively obtaining connection points in a main transformer side three-phase winding and ground knife leading-out connecting plate connection path of a transformer as three-phase winding connection points of the transformer; or respectively acquiring a connection point in a connection path with the high-side three-phase inlet wire casing head of the transformer as a three-phase winding connection point of the transformer. And the three-phase winding connection point of the transformer is connected with the three-phase test port of the direct resistance tester by using the three-phase test wires, so that the three-phase test connection point of the direct resistance tester is connected with the three-phase winding connection point of the transformer by the three-phase test wires respectively, and the three-phase direct resistance value of the transformer is synchronously measured by the direct resistance tester. The technical problems that the connection point of the three-phase winding of the cable outgoing type transformer is difficult to obtain and the single-phase direct resistance value of the transformer cannot be directly and synchronously measured through a direct resistance tester are solved.
And step 208, synchronously measuring the three-phase direct resistance value of the transformer through the direct resistance tester.
Specifically, in this embodiment, the transformer may be a cable outlet type transformer for a Gas Insulated Substation (GIS) or a cable outlet type transformer for an open-type substation. The connection mode of the transformer is a three-phase four-wire star type. The first direct resistance test line is a double-end direct resistance test line.
Specifically, in the method for synchronously testing the direct resistance of the three-phase winding of the cable-outlet transformer in the above embodiment, the connection point of the transformer neutral point bushing is connected with the connection point of the cable armor layer on the outlet side of the transformer through the first direct resistance test wire, the neutral point test port of the direct resistance tester is connected with the incoming cable armor layer of the transformer through the second direct resistance test wire, and the three-phase winding connection point of the transformer is connected with the three-phase test port of the direct resistance tester based on the three-phase test wires, so that the direct resistance tester is used for synchronously measuring the direct resistance values of the three windings of the transformer, thereby being capable of finding the winding hidden troubles of the main transformer in time, providing a basis for development of defect elimination work and establishment of equipment maintenance strategies, and effectively reducing the overall operation and maintenance cost of the power system.
Further, in an embodiment of the present application, as shown in fig. 2, there is provided a method for synchronously testing direct resistance of three-phase windings of a cable outlet type transformer, after the connecting point of a neutral point bushing of the transformer is connected to a connecting point of a cable armor layer on an outlet side of the transformer based on a first direct resistance test line, the method further includes:
Specifically, in the method for testing the direct resistance synchronization of the three-phase winding of the cable-outlet transformer in the above embodiment, by analyzing the cable structure, it is found that the conductive core of the cable main body and the external metal-clad layer have better insulation, and the conductive performance of the external metal-clad layer is better. Respectively obtaining connection points in a main transformer side three-phase winding and ground knife leading-out connecting plate connection path of a transformer as three-phase winding connection points of the transformer; or respectively acquiring a connection point in a connection path with the high-side three-phase inlet wire casing head of the transformer as a three-phase winding connection point of the transformer. The three-phase test connection point of the direct resistance tester is connected with the three-phase winding connection point of the transformer through a three-phase test wire, so that the three-phase direct resistance value of the transformer can be synchronously measured through the direct resistance tester.
Further, in an embodiment of the present application, there is provided a method for synchronously testing direct resistance of three-phase windings of a cable outlet type transformer, as shown in fig. 3, after synchronously measuring three-phase direct resistance values of the transformer by the direct resistance tester, the method further includes:
and 209, calculating the three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance value.
The three-phase direct resistance unbalance rate of the transformer is the ratio of the difference value between the maximum value and the minimum value in the three-phase direct resistance values of the transformer to the average three-phase direct resistance value of the transformer. The three-phase direct resistance unbalance of the transformer means that the amplitudes of three-phase currents or voltages in a power system are inconsistent, and the amplitude difference exceeds a preset range. For example, in a power transformer having a predetermined capacity of 1.6MVA or more, the phase resistance unbalance rate should not be more than 2%, and in a power transformer having a capacity of 1.6MVA or less, the line resistance unbalance rate of a winding having no neutral point lead-out should not be more than 1%, and in general, the phase resistance unbalance rate is not more than 4%, and in general, the line resistance unbalance rate is not more than 2%. From the practical engineering viewpoint, the line resistance imbalance rate may be considered to be half of the phase resistance imbalance rate, and in the embodiment of the present application, the imbalance rate limit value of the dc line resistance of the transformer may be defined to be 2%.
Under the condition that the transformer normally works, the three-phase direct resistance unbalance rate of the three-phase winding of the transformer can be in a certain safety range, otherwise, the three-phase direct resistance unbalance rate is obviously abnormal, and the direct resistance defect of the transformer can be judged by analyzing the three-phase direct resistance unbalance rate. For example, when the three-phase direct resistance unbalance rate of the transformer exceeds a preset range, whether the transformer has reasons of loose connecting wires, terminal aging, poor contact, abnormal load and the like can be analyzed, and potential fault hazards of the transformer can be comprehensively analyzed by combining other conditions of power system operation in a transformer area.
In the method for synchronously testing the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, the three-phase direct resistance value of the transformer is obtained through synchronous measurement of the direct resistance tester, and the three-phase direct resistance unbalance rate of the transformer can be calculated based on the three-phase direct resistance value. Under the condition that the transformer normally works, the three-phase direct resistance unbalance rate of the three-phase winding of the transformer can be in a certain safety range, otherwise, the three-phase direct resistance unbalance rate is obviously abnormal, and the direct resistance defect of the transformer can be judged by analyzing the three-phase direct resistance unbalance rate.
Further, in an embodiment of the present application, there is provided a method for synchronously testing direct resistance of three-phase windings of a cable outlet type transformer, as shown in fig. 4, after calculating a three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance values, the method further includes:
and 2011, controlling an alarm device to send out an alarm signal when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range.
Specifically, when the three-phase direct resistance unbalance rate is detected to exceed a preset safety threshold range, for example, 2%, the control alarm device sends an alarm signal to prompt relevant staff to take relevant processing measures in time. The form of the alarm signal includes but is not limited to at least one of alarm sound, alarm light, alarm short message, alarm image and alarm bullet screen.
In the method for synchronously testing the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, under the condition that the transformer works normally, the three-phase direct resistance unbalance rate of the three-phase winding is within a certain safety range, otherwise, the three-phase direct resistance unbalance rate is obviously abnormal, and by monitoring the three-phase direct resistance unbalance rate of the transformer in real time, when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range, the alarm device is controlled to send out an alarm signal, and related workers are reminded to take corresponding treatment measures to avoid the transformer from generating faults and influencing the normal operation of a power supply system at the output side of the transformer.
It should be understood that although the various steps in the flow charts of fig. 1-4 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. 1-4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In an embodiment of the present application, as shown in fig. 5, there is provided a cable outlet type transformer three-phase winding direct resistance synchronous testing device, including a first direct resistance testing line 20, a second direct resistance testing line 40, a three-phase testing line and a direct resistance tester 60, wherein the first direct resistance testing line 20 is used for connecting a connection point 10 of a transformer neutral point bushing with a connection point 30 of a cable armor layer on an outlet side of a transformer 100; the direct resistance tester 60 is used for synchronously measuring the three-phase direct resistance value of the transformer 100; the second direct resistance test wire 40 is used for connecting the direct resistance tester 60 with the incoming cable armor layer 200 of the transformer 100; and the three-phase test wire is used for respectively connecting the three-phase winding connection point of the transformer with the three-phase test port of the direct resistance tester. The direct resistance tester 60 is used for synchronously measuring the three-phase direct resistance values of the transformer 100.
Specifically, the cables led out from the three-phase windings of the cable outlet transformer 100 are covered by the cable sheathing layer 200, and the three-phase winding lead-out wires of the cable outlet transformer 100 are respectively led out from the cable sheathing layer 200 and then respectively connected to the earthing knife earthing connecting plate 300. One end of the first direct resistance test wire 20 is connected to the neutral point connection terminal 10 of the transformer 100, and the other end of the first direct resistance test wire 20 is connected to the outlet side connection point 31 of the a-phase cable armor 200. The three-phase test lines include a first three-phase test line 51, a second three-phase test line 52, and a third three-phase test line 53. One end of the first three-phase test wire 51 is used for being communicated with the phase a winding of the transformer 100, and the other end of the first three-phase test wire 51 is used for being connected with the phase a connection end of the direct resistance tester 60; one end of the second three-phase test wire 52 is used for being communicated with the b-phase winding of the transformer 100, and the other end of the second three-phase test wire 52 is used for being connected with the b-phase connection end of the direct resistance tester 60; one end of the third three-phase test wire 53 is used for communicating with the c-phase winding of the transformer 100, and the other end of the third three-phase test wire 53 is used for connecting with the c-phase connection end of the direct resistance tester 60. The neutral point connection port 32 is disposed on the incoming cable armor 200 of the transformer 100, so that one end of the second direct resistance test line 40 can be connected to the neutral point connection port 32, and the other end of the second direct resistance test line 40 can be connected to the neutral point test port of the direct resistance tester 60. In the present embodiment, the transformer 100 may be a GIS substation or an indoor open substation cable outlet type transformer. The transformer 100 is connected in a three-phase four-wire star configuration. Preferably, the first straight resistance test line 20 is a double-ended straight resistance test line.
In the synchronous testing device for direct resistance of three-phase windings of the cable outgoing type transformer in the above embodiment, by analyzing the cable structure, it is found that the conductive wire core of the cable main body and the external metal-clad layer have better insulation and the conductive performance of the external metal-clad layer is better. Respectively obtaining connection points in a main transformer side three-phase winding and ground knife leading-out connecting plate connection path of a transformer as three-phase winding connection points of the transformer; or respectively acquiring a connection point in a connection path with the high-side three-phase inlet wire casing head of the transformer as a three-phase winding connection point of the transformer. The three-phase test connection point of the direct resistance tester is connected with the three-phase winding connection point of the transformer through a three-phase test wire, so that the three-phase direct resistance value of the transformer can be synchronously measured through the direct resistance tester.
In an embodiment of the present application, as shown in fig. 6, a synchronous testing apparatus for direct resistance of a three-phase winding of a cable outlet type transformer is provided, which further includes a control apparatus 70, the control apparatus 70 is connected to the direct resistance tester 60, the control apparatus 70 can obtain three-phase direct resistance values of the transformer 100 through the direct resistance tester 60, the control apparatus 70 calculates a three-phase direct resistance unbalance rate of the transformer 100 based on the three-phase direct resistance values, and determines a direct resistance defect of the transformer 100 based on the three-phase direct resistance unbalance rate. For example, when the three-phase direct resistance unbalance rate of the transformer exceeds a preset range, whether the transformer has reasons of loose connecting wires, terminal aging, poor contact, abnormal load and the like can be analyzed, and potential fault hazards of the transformer can be comprehensively analyzed by combining other conditions of power system operation in a transformer area.
In the synchronous testing device for the direct resistance of the three-phase winding of the cable outlet type transformer in the above embodiment, the three-phase direct resistance value of the transformer obtained by synchronous measurement of the direct resistance tester can be used for calculating the three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance value. Under the condition that the transformer normally works, the three-phase direct resistance unbalance rate of the three-phase winding of the transformer can be in a certain safety range, otherwise, the three-phase direct resistance unbalance rate is obviously abnormal, and the direct resistance defect of the transformer can be judged by analyzing the three-phase direct resistance unbalance rate.
In an embodiment of the present application, as shown in fig. 7, there is provided a synchronous testing device for direct resistance of three-phase winding of cable outlet type transformer, further comprising an alarm device 80, where the alarm device 80 is connected to the control device 70, and the alarm device 80 is configured to send an alarm signal based on the control of the control device 70 when the calculated imbalance ratio of three-phase direct resistance of the three-phase winding exceeds a preset safety threshold range by the control device 70.
Specifically, when the three-phase direct resistance unbalance rate is detected to exceed a preset safety threshold range, for example, 2%, the control alarm device sends an alarm signal to prompt a relevant worker to take a relevant treatment measure. The form of the alarm signal includes but is not limited to at least one of alarm sound, alarm light, alarm short message, alarm image and alarm bullet screen.
In the method for synchronously testing the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, under the condition that the transformer works normally, the three-phase direct resistance unbalance rate of the three-phase winding is within a certain safety range, otherwise, the three-phase direct resistance unbalance rate is obviously abnormal, and by monitoring the three-phase direct resistance unbalance rate of the transformer in real time, when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range, the alarm device is controlled to send out an alarm signal, and related workers are reminded to take corresponding treatment measures to avoid the transformer from generating faults and influencing the normal operation of a power supply system at the output side of the transformer.
In the synchronous testing device for the direct resistance of the three-phase winding of the cable outlet type transformer in the embodiment, the connection point of the transformer neutral point sleeve is connected with the connection point of the cable armor layer on the outlet side of the transformer through the first direct resistance testing wire, the neutral point testing port of the direct resistance tester is connected with the incoming cable armor layer of the transformer through the second direct resistance testing wire, the three-phase winding connection point of the transformer is respectively connected with the three-phase testing port of the direct resistance tester based on the three-phase testing wires, so that the direct resistance value of the three windings of the transformer is synchronously measured by using the direct resistance tester, the winding hidden danger of the main transformer can be timely found, a basis is provided for development of defect elimination work and establishment of equipment maintenance strategies, and the overall operation and maintenance cost of a power system is effectively reduced.
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 application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for synchronously testing direct resistance of three-phase windings of a cable outlet type transformer is characterized by comprising the following steps:
connecting the connecting point of the transformer neutral point sleeve with the connecting point of the cable armor layer at the outlet side of the transformer based on a first direct resistance test wire;
connecting a neutral point test port of the direct resistance tester with an inlet cable armor layer of the transformer based on a second direct resistance test wire;
respectively connecting a three-phase winding connection point of the transformer with a three-phase test port of the direct resistance tester based on a three-phase test wire;
and synchronously measuring the three-phase direct resistance value of the transformer by the direct resistance tester.
2. The method of claim 1, wherein after connecting the connection point of the transformer neutral bushing to the connection point of the cable armor on the outgoing side of the transformer based on the first direct resistance test line, further comprising:
respectively acquiring connection points in a main transformer side three-phase winding and ground cutter leading-out connecting plate connecting passage of the transformer as three-phase winding connection points of the transformer; or
And respectively acquiring connection points in connection passages with the high-side three-phase inlet wire casing head of the transformer as three-phase winding connection points of the transformer.
3. The method according to claim 2, wherein after synchronously measuring the three-phase direct resistance values of the transformer by the direct resistance tester, the method further comprises:
calculating the three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance value;
and judging the direct resistance defect of the transformer based on the three-phase direct resistance unbalance rate.
4. The method of claim 3, wherein after the calculating the three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance value, further comprising:
and when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range, controlling an alarm device to send out an alarm signal.
5. Method according to any of claims 1-4, characterized in that the transformer is a cable-outlet transformer for an indoor gas-insulated substation or a cable-outlet transformer for an indoor open substation.
6. The method according to any of claims 1-4, wherein the transformers are connected in a three-phase four-wire star configuration.
7. The method of any one of claims 1-4, wherein the first direct resistance test line is a dual-ended direct resistance test line.
8. The utility model provides a cable outlet type transformer three-phase winding direct resistance synchronous testing arrangement which characterized in that includes:
the first direct resistance test wire is used for connecting the connecting point of the transformer neutral point sleeve with the connecting point of the cable armor layer on the outgoing line side of the transformer;
the direct resistance tester is used for synchronously measuring the three-phase direct resistance value of the transformer;
the second direct resistance test wire is used for connecting a neutral point test port of the direct resistance tester with an inlet cable armor layer of the transformer;
and the three-phase test wire is used for respectively connecting the three-phase winding connection point of the transformer with the three-phase test port of the direct resistance tester.
9. The apparatus of claim 8, further comprising:
and the control device is connected with the direct resistance tester and used for calculating the three-phase direct resistance unbalance rate of the transformer based on the three-phase direct resistance value and judging the direct resistance defect of the transformer based on the three-phase direct resistance unbalance rate.
10. The apparatus of claim 9, further comprising:
and the alarm device is connected with the control device and used for sending out an alarm signal based on the control of the control device when the three-phase direct resistance unbalance rate exceeds a preset safety threshold range.
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| CN202010086383.4A CN111337750B (en) | 2020-02-11 | 2020-02-11 | Method and device for synchronously testing direct resistance of three-phase winding of cable outgoing type transformer |
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