Dual-winding transformer and three-winding transformer measurement connection system
By changing the winding connection method through a dielectric loss factor measurement module and a high-voltage relay, the problem of difficult on-site wiring of transformers was solved, improving work efficiency and reducing safety risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- STATE GRID HEBEI ELECTRIC POWER CO LTD
- Filing Date
- 2022-11-24
- Publication Date
- 2026-04-14
AI Technical Summary
On-site measurement and wiring of transformers is difficult, especially for transformers above 110kV, which requires the assistance of large equipment, resulting in low work efficiency and safety hazards.
The system employs a dielectric loss factor measurement module, relays, and a grounding module. By changing the winding connection method through control commands, the wiring process is simplified, the number of wires is reduced, and a high-voltage relay is used to ground the winding or connect it to the measurement module.
It simplifies the on-site wiring and line changing process for transformer parameter measurement, improves work efficiency, and reduces safety risks.
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Figure CN115856443B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of transformer measurement wiring technology, and particularly relates to measurement wiring systems for two-winding transformers and three-winding transformers. Background Technology
[0002] Transformers are large in size, especially those above 110kV. On-site testing, wiring, and line changing on the transformer side are difficult, and large bucket trucks are sometimes required to assist with wiring. Special attention must also be paid to on-site work safety. This process is time-consuming, labor-intensive, and has very low work efficiency. Summary of the Invention
[0003] To overcome the difficulties of on-site wiring and rewiring for measuring transformer parameters, as well as the problems of high workload and insufficient efficiency, this application provides a wiring system for measuring dual-winding transformers and three-winding transformers.
[0004] This application is achieved through the following technical solution:
[0005] In a first aspect, embodiments of this application provide a measurement wiring system for a dual-winding transformer, comprising: a dielectric loss factor measurement module, a first high-voltage relay, a second high-voltage relay, a grounding module, and a short-circuit module; the dielectric loss factor measurement module is connected to the low-voltage winding of the dual-winding transformer via the first high-voltage relay, and to one phase of the high-voltage winding of the dual-winding transformer via the second high-voltage relay; the short-circuit module is connected to the low-voltage winding of the dual-winding transformer, and the grounding module is connected to the outer casing of the dual-winding transformer;
[0006] The first and second high-voltage relays are used to respond to control commands to connect one phase of the low-voltage winding of the dual-winding transformer and / or one phase of the high-voltage winding of the dual-winding transformer to the dielectric loss factor measurement module, and to ground the winding of one phase of the low-voltage winding and the high-voltage winding that is not connected to the dielectric loss factor measurement module.
[0007] The dielectric loss factor measurement module is used to measure the dielectric loss factor of a two-winding transformer and simultaneously apply voltage to the windings of the two-winding transformer.
[0008] The short-circuit module is used to short-circuit the low-voltage winding;
[0009] The grounding module is used to ground the casing of a dual-winding transformer.
[0010] In conjunction with the first aspect, in some possible implementations, when the low-voltage winding of the dual-winding transformer is connected to the dielectric loss factor measurement module, the second high-voltage relay controls one phase of the high-voltage winding of the dual-winding transformer to ground, the grounding module is activated, and the casing of the dual-winding transformer is grounded.
[0011] In conjunction with the first aspect, in some possible implementations, when one phase of the high-voltage winding of the double-winding transformer is connected to the dielectric loss factor measurement module, the first high-voltage relay controls the low-voltage winding of the double-winding transformer to be grounded, the grounding module is activated, and the casing of the double-winding transformer is grounded.
[0012] In conjunction with the first aspect, in some possible implementations, when one phase of the high-voltage winding of the dual-winding transformer is connected to the dielectric loss factor measurement module, and the low-voltage winding of the dual-winding transformer is connected to the dielectric loss factor measurement module, the grounding module is activated to ground the casing of the dual-winding transformer.
[0013] Secondly, embodiments of this application provide a three-winding transformer measurement wiring system, including: a dielectric loss factor measurement module, a first high-voltage relay, a second high-voltage relay, a third high-voltage relay, a grounding module, and a short-circuit module;
[0014] The dielectric loss factor measurement module can be connected to the low-voltage winding of the three-winding transformer via the first high-voltage relay, to one phase of the medium-voltage winding of the three-winding transformer via the second high-voltage relay, and to one phase of the high-voltage winding of the three-winding transformer via the third high-voltage relay; the short-circuit module is connected to the low-voltage winding of the three-winding transformer, and the grounding module is connected to the outer casing of the three-winding transformer.
[0015] The first high-voltage relay, the second high-voltage relay, and the third high-voltage relay are used to respond to control commands to connect one phase of the low-voltage winding and / or one phase of the medium-voltage winding of the three-winding transformer and / or one phase of the high-voltage winding of the three-winding transformer to the dielectric loss factor measurement module, and to ground the windings of the low-voltage winding, one phase of the medium-voltage winding, and one phase of the high-voltage winding that are not connected to the dielectric loss factor measurement module.
[0016] The dielectric loss factor measurement module is used to measure the dielectric loss factor of a three-winding transformer and simultaneously apply voltage to the windings of the three-winding transformer.
[0017] The short-circuit module is used to short-circuit the low-voltage winding;
[0018] The grounding module is used to ground the casing of a three-winding transformer.
[0019] In conjunction with the second aspect, in some possible implementations, when the low-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the second high-voltage relay controls one phase of the medium-voltage winding of the three-winding transformer to be grounded, and the third high-voltage relay controls one phase of the high-voltage winding of the three-winding transformer to be grounded. The grounding module is activated, grounding the casing of the three-winding transformer.
[0020] In conjunction with the second aspect, in some possible implementations, when one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the first high-voltage relay controls the low-voltage winding of the three-winding transformer to be grounded, and the third high-voltage relay controls one phase of the high-voltage winding of the three-winding transformer to be grounded. The grounding module is activated, grounding the casing of the three-winding transformer.
[0021] In conjunction with the second aspect, in some possible implementations, when one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the first high-voltage relay controls the low-voltage winding of the three-winding transformer to be grounded, the second high-voltage relay controls one phase of the medium-voltage winding of the three-winding transformer to be grounded, the grounding module is activated, and the casing of the three-winding transformer is grounded.
[0022] In conjunction with the second aspect, in some possible implementations, when one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, and one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the first high-voltage relay controls the low-voltage winding of the transformer to be grounded, the grounding module is activated, and the casing of the three-winding transformer is grounded.
[0023] In conjunction with the second aspect, in some possible implementations, when one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, and the low-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the grounding module is activated to ground the casing of the three-winding transformer.
[0024] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.
[0025] The beneficial effects of the embodiments in this application compared with the prior art are:
[0026] This application transforms the cumbersome and difficult wiring method into one that achieves the purpose of wiring change by changing the working mode of simple devices by changing the connection between different windings and the dielectric loss factor measurement module through the first and second high-voltage relays. One phase of the high-voltage winding is grounded or connected to the dielectric loss factor measurement module, reducing the number of wires. Combined with the high-voltage relays mentioned above, it simplifies the on-site wiring and wiring of transformer parameter measurement and improves work efficiency.
[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a wiring diagram of a dual-winding transformer system provided in one embodiment of this application;
[0030] Figure 2 This is another wiring diagram of a dual-winding transformer system provided in one embodiment of this application;
[0031] Figure 3 This is another wiring diagram of a dual-winding transformer system provided in one embodiment of this application;
[0032] Figure 4 This is a schematic diagram of a three-winding transformer system provided in one embodiment of this application;
[0033] Figure 5 This is another wiring diagram of a three-winding transformer system provided in one embodiment of this application;
[0034] Figure 6 This is another wiring diagram of a three-winding transformer system provided in one embodiment of this application;
[0035] Figure 7 This is another wiring diagram of a three-winding transformer system provided in one embodiment of this application;
[0036] Figure 8 This is another wiring diagram of a three-winding transformer system provided in one embodiment of this application;
[0037] Figure 9 This is a schematic diagram of a connector at the high-voltage winding provided in an embodiment of this application. Detailed Implementation
[0038] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.
[0039] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.
[0040] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0041] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."
[0042] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0043] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.
[0044] Figure 1 This is a wiring diagram of a dual-winding transformer system provided in an embodiment of this application, with reference to... Figure 1 The detailed wiring of this two-winding transformer system is as follows:
[0045] A measurement wiring system for a dual-winding transformer includes: a dielectric loss factor measurement module 10, a first high-voltage relay S1, a second high-voltage relay S2, a grounding module 11, and a short-circuit module 12.
[0046] The dielectric loss factor measurement module 10 can be connected to the low-voltage winding of the double-winding transformer through the first high-voltage relay S1, and to one phase of the high-voltage winding of the double-winding transformer through the second high-voltage relay S2; the short-circuit module 12 is connected to the low-voltage winding of the double-winding transformer, and the grounding module 11 is connected to the outer casing of the double-winding transformer.
[0047] The first high-voltage relay S1 and the second high-voltage relay S2 are used to respond to control commands, such that one phase of the low-voltage winding of the dual-winding transformer and / or one phase of the high-voltage winding of the dual-winding transformer are connected to the dielectric loss factor measurement module 10, and that the windings of the low-voltage winding and the high-voltage winding that are not connected to the dielectric loss factor measurement module 10 are grounded.
[0048] The dielectric loss factor measurement module 10 is used to measure the dielectric loss factor of the two-winding transformer and simultaneously apply voltage to the windings of the two-winding transformer. The short-circuit module 12 is used to short-circuit the low-voltage winding. The grounding module 11 is used to ground the casing of the two-winding transformer.
[0049] The dual-winding transformer measurement wiring system uses the first high-voltage relay S1 and the second high-voltage relay S2 to change the connection between different windings and the dielectric loss factor measurement module. This transforms the relatively cumbersome and difficult wiring method into achieving the purpose of wiring by changing the working mode of simple devices. One phase of the high-voltage winding is grounded or connected to the dielectric loss factor measurement module 10, reducing the number of wirings. Combined with the high-voltage relays mentioned above, the on-site wiring and wiring of transformer parameters are simplified, improving work efficiency.
[0050] In practical production and daily life, when measuring the dielectric loss factor, the traditional method requires short-circuiting all phases of the measuring winding and short-circuiting all phases of the non-measuring winding to ground, and then connecting the dielectric loss factor measurement module through the winding to measure the dielectric loss factor. This solution, however, reverses the logic of not short-circuiting the transformer windings during operation, directly short-circuiting the low-voltage winding. According to transformer characteristics, when the low-voltage winding is short-circuited, the other windings are also in a short-circuited state.
[0051] For example, such as Figure 1 As shown, when the low-voltage winding of the dual-winding transformer is connected to the dielectric loss factor measurement module 10, the second high-voltage relay S2 controls one phase of the high-voltage winding of the dual-winding transformer to be grounded, and the grounding module 11 is activated to ground the casing of the dual-winding transformer.
[0052] For example, such as Figure 2 As shown, when one phase of the high-voltage winding of the double-winding transformer is connected to the dielectric loss factor measurement module 10, the first high-voltage relay S1 controls the low-voltage winding of the double-winding transformer to be grounded, and the grounding module 11 is activated to ground the casing of the double-winding transformer.
[0053] For example, such as Figure 3 As shown, when one phase of the high-voltage winding of the double-winding transformer is connected to the dielectric loss factor measurement module 10, and the low-voltage winding of the double-winding transformer is connected to the dielectric loss factor measurement module 10, the grounding module 11 is activated, grounding the casing of the double-winding transformer.
[0054] Figure 4 This is a wiring diagram of a three-winding transformer system provided in one embodiment of this application, with reference to... Figure 4 The detailed wiring of this three-winding transformer system is as follows:
[0055] A three-winding transformer measurement wiring system includes: a dielectric loss factor measurement module 10, a first high-voltage relay S1, a second high-voltage relay S2, a third high-voltage relay S3, a grounding module 11, and a short-circuit module 12. The dielectric loss factor measurement module 10 can be connected to the low-voltage winding of the three-winding transformer via the first high-voltage relay S1, to one phase of the medium-voltage winding of the three-winding transformer via the second high-voltage relay S2, and to one phase of the high-voltage winding of the three-winding transformer via the third high-voltage relay S3; the short-circuit module 12 is connected to the low-voltage winding of the three-winding transformer, and the grounding module 11 is connected to the outer casing of the three-winding transformer.
[0056] The first high-voltage relay S1, the second high-voltage relay S2, and the third high-voltage relay S3 are used to respond to control commands, such that one phase of the low-voltage winding and / or one phase of the medium-voltage winding of the three-winding transformer and / or one phase of the high-voltage winding of the three-winding transformer are connected to the dielectric loss factor measurement module 10, and that the windings of the low-voltage winding, one phase of the medium-voltage winding, and one phase of the high-voltage winding that are not connected to the dielectric loss factor measurement module 10 are grounded.
[0057] The dielectric loss factor measurement module 10 is used to measure the dielectric loss factor of the three-winding transformer and simultaneously apply voltage to the windings of the three-winding transformer. The short-circuit module 12 is used to short-circuit the low-voltage winding. The grounding module 11 is used to ground the casing of the three-winding transformer.
[0058] For example, such as Figure 4 As shown, when the low-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, the second high-voltage relay S2 controls one phase of the medium-voltage winding of the three-winding transformer to be grounded, and the third high-voltage relay S3 controls one phase of the high-voltage winding of the three-winding transformer to be grounded. The grounding module 11 is activated, so that the casing of the three-winding transformer is grounded.
[0059] For example, such as Figure 5As shown, when one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, the first high-voltage relay S1 controls the low-voltage winding of the three-winding transformer to be grounded, the third high-voltage relay S3 controls one phase of the high-voltage winding of the three-winding transformer to be grounded, and the grounding module 11 is activated to ground the casing of the three-winding transformer.
[0060] For example, such as Figure 6 As shown, when one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, the first high-voltage relay S1 controls the low-voltage winding of the three-winding transformer to be grounded, the second high-voltage relay S2 controls one phase of the medium-voltage winding of the three-winding transformer to be grounded, and the grounding module 11 is activated to ground the casing of the three-winding transformer.
[0061] For example, such as Figure 7 As shown, when one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, and one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, the first high-voltage relay S1 controls the low-voltage winding of the transformer to be grounded, and the grounding module 11 is activated, so that the casing of the three-winding transformer is grounded.
[0062] For example, such as Figure 8 As shown, when one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, and the low-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module 10, the grounding module 11 is activated, grounding the casing of the three-winding transformer.
[0063] The three-winding transformer measurement wiring system uses the first high-voltage relay S1, the second high-voltage relay S2, and the third high-voltage relay S3 to change the connection between different windings and the dielectric loss factor measurement module 10. This transforms the relatively cumbersome and difficult wiring method into achieving the purpose of wiring by changing the working mode of simple devices. One phase of the medium-voltage winding is grounded or connected to the dielectric loss factor measurement module 10, and one phase of the high-voltage winding is grounded or connected to the dielectric loss factor measurement module 10. This reduces the number of wiring connections. Combined with the high-voltage relays mentioned above, it simplifies the on-site wiring and wiring of transformer parameters and improves work efficiency.
[0064] Specifically, in some embodiments, the dielectric loss factor measurement module can be replaced with a capacitance measurement module according to production needs. The capacitance measurement module is used to measure the capacitance value of a two-winding transformer or a three-winding transformer, and at the same time apply voltage to the windings of the two-winding transformer or the three-winding transformer.
[0065] Specifically, in some specific embodiments, such as Figure 9 As shown, considering safety issues in actual production and daily life, in order to avoid the occurrence of discharge phenomena, an insulating bushing is installed between the joint and the double-winding transformer or the triple-winding transformer. The bushing plays a protective role.
[0066] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0067] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A measurement wiring system for a dual-winding transformer, characterized in that, The system includes a dielectric loss factor measurement module, a first high-voltage relay, a second high-voltage relay, a grounding module, and a short-circuit module. The dielectric loss factor measurement module connects to the low-voltage winding of the two-winding transformer via the first high-voltage relay and to one phase of the high-voltage winding via the second high-voltage relay. The short-circuit module connects to the low-voltage winding of the two-winding transformer, and the grounding module connects to the transformer's casing. The first and second high-voltage relays respond to control commands, connecting the low-voltage winding and / or one phase of the high-voltage winding of the two-winding transformer to the dielectric loss factor measurement module, and grounding the windings of the low-voltage and high-voltage windings not connected to the module. The dielectric loss factor measurement module measures the dielectric loss factor of the two-winding transformer and applies voltage to its windings. The short-circuit module short-circuits the low-voltage winding, and the grounding module grounds the transformer's casing. When one phase of the high-voltage winding of the double-winding transformer is connected to the dielectric loss factor measurement module, the first high-voltage relay controls the low-voltage winding of the double-winding transformer to be grounded, the grounding module is activated, and the casing of the double-winding transformer is grounded.
2. The measurement wiring system for a dual-winding transformer as described in claim 1, characterized in that, When the low-voltage winding of the double-winding transformer is connected to the dielectric loss factor measurement module, the second high-voltage relay controls one phase of the high-voltage winding of the double-winding transformer to ground, the grounding module is activated, and the casing of the double-winding transformer is grounded.
3. The measurement wiring system for a dual-winding transformer as described in claim 1, characterized in that, When one phase of the high-voltage winding of the double-winding transformer is connected to the dielectric loss factor measurement module, and the low-voltage winding of the double-winding transformer is connected to the dielectric loss factor measurement module, the grounding module is activated, grounding the casing of the double-winding transformer.
4. A measurement wiring system for a three-winding transformer, characterized in that, include: The transformer comprises a dielectric loss factor measurement module, a first high-voltage relay, a second high-voltage relay, a third high-voltage relay, a grounding module, and a short-circuit module. The dielectric loss factor measurement module is connected to the low-voltage winding of the three-winding transformer via the first high-voltage relay, to one phase of the medium-voltage winding via the second high-voltage relay, and to one phase of the high-voltage winding via the third high-voltage relay. The short-circuit module is connected to the low-voltage winding of the three-winding transformer, and the grounding module is connected to the outer casing of the three-winding transformer. The first high-voltage relay, the second high-voltage relay, and the third high-voltage relay are used to respond to control commands to connect the low-voltage winding and / or one phase of the medium-voltage winding and / or one phase of the high-voltage winding of the three-winding transformer to the dielectric loss factor measurement module, and to ground the windings of the low-voltage winding, one phase of the medium-voltage winding, and one phase of the high-voltage winding that are not connected to the dielectric loss factor measurement module. The dielectric loss factor measurement module is used to measure the dielectric loss factor of the three-winding transformer and simultaneously apply voltage to the windings of the three-winding transformer. The short-circuiting module is used to short-circuit the low-voltage winding. The grounding module is used to ground the casing of the three-winding transformer. When one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, and one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the first high-voltage relay controls the low-voltage winding of the transformer to be grounded, the grounding module is activated, and the casing of the three-winding transformer is grounded.
5. The three-winding transformer measurement wiring system as described in claim 4, characterized in that, When the low-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the second high-voltage relay controls one phase of the medium-voltage winding of the three-winding transformer to be grounded, and the third high-voltage relay controls one phase of the high-voltage winding of the three-winding transformer to be grounded. The grounding module is activated, grounding the outer casing of the three-winding transformer.
6. The three-winding transformer measurement wiring system as described in claim 4, characterized in that, When one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the first high-voltage relay controls the low-voltage winding of the three-winding transformer to be grounded, and the third high-voltage relay controls one phase of the high-voltage winding of the three-winding transformer to be grounded. The grounding module is activated, grounding the outer casing of the three-winding transformer.
7. The three-winding transformer measurement wiring system as described in claim 4, characterized in that, When one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the first high-voltage relay controls the low-voltage winding of the three-winding transformer to be grounded, and the second high-voltage relay controls one phase of the medium-voltage winding of the three-winding transformer to be grounded. The grounding module is activated, grounding the outer casing of the three-winding transformer.
8. The three-winding transformer measurement wiring system as described in claim 4, characterized in that, When one phase of the high-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, one phase of the medium-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, and the low-voltage winding of the three-winding transformer is connected to the dielectric loss factor measurement module, the grounding module is activated, grounding the outer casing of the three-winding transformer.
Citation Information
Patent Citations
Method for measuring dielectric loss factor and insulation resistance of power transformer
CN103018576A