Capacitive voltage divider and capacitive voltage transformer
By adopting a new integrated composite insulating sleeve in the capacitive voltage divider of capacitive voltage transformer, the problems of poor mechanical performance, high oil leakage risk and high manufacturing cost of traditional capacitive voltage dividers are solved, and higher mechanical performance and Lower oil leakage risk and manufacturing costs.
Patent Information
- Application Number
- CN202420433398.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-03-06
AI Technical Summary
The capacitive voltage divider of traditional capacitive voltage transformers has problems such as poor mechanical performance, prone to breaking due to excessive length, high oil leakage risk and high manufacturing cost.
The new integrated composite insulating sleeve is used as the outer insulating sleeve of the capacitor voltage divider. By continuously extending the insulator in the connection direction and surrounding the outside of multiple series-connected capacitors, the connection points are reduced and mechanical properties are improved.
It realizes that while meeting the requirements of high voltage and high insulation performance, it reduces oil leakage risks, enhances mechanical properties and reduces manufacturing costs.
Smart Images
Figure CN222530178U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of voltage transformers, and in particular to a capacitive voltage divider included in a capacitive voltage transformer. Background Art
[0002] The capacitive voltage transformer is a voltage transformer that is divided by a series capacitor and then stepped down and isolated by an electromagnetic transformer. It is used as a voltage transformer for meters, relay protection, etc.
[0003] At present, the capacitor voltage transformer is mainly composed of a capacitor voltage divider and a medium voltage transformer. The capacitor voltage divider consists of a porcelain sleeve and a number of series capacitor units installed therein. The porcelain sleeve is filled with insulating oil that maintains a positive pressure of 0.1MPa. When the voltage in the line connected to the capacitor voltage transformer is above 550KV, due to the high voltage level, the insulation performance requirements of the capacitor voltage divider are high, so the traditional capacitor voltage divider usually chooses three or more porcelain sleeves as its external insulation.
[0004] Although the structure meets the insulation performance, the increase in the length of the capacitor divider makes the overall mechanical performance of the capacitor divider poor. For example, when the diameter remains unchanged, the longer the length, the easier it is to break at the connection point. In addition, since the porcelain sleeve sections need to be connected by, for example, metal flanges, there is a great risk of oil leakage, which increases the manufacturing cost.
[0005] In view of this, the present disclosure proposes to use a new integral composite insulating sleeve as the outer insulating sleeve of the capacitor divider of the capacitive voltage transformer, which can perfectly meet the requirements of 550KV high voltage and high insulation performance, and at the same time solve the problem caused by the excessive length of the capacitor divider part of the traditional capacitive voltage transformer, reduce the risk of oil leakage, and enhance the mechanical properties. Utility Model Content
[0006] The embodiments of the present disclosure provide a method of using a novel integral composite insulating sleeve as the outer insulating sleeve of a capacitive voltage transformer for a capacitive voltage divider, so as to at least solve the problems of poor mechanical properties, oil leakage risk, high manufacturing cost, etc. of the capacitive voltage divider in the prior art.
[0007] According to one aspect of the present application, a capacitive voltage divider is provided, which includes a terminal connected to an external power grid to receive current; a plurality of capacitors connected in series, connected to the terminal to receive the current and divide the current; a grounding terminal connected to the last capacitor of the plurality of capacitors connected in series to ground the divided current; and an insulating sleeve having a columnar structure extending continuously along the connection direction of the plurality of capacitors connected in series and surrounding the outside of the plurality of capacitors connected in series.
[0008] In this way, by making the insulator continuously extend along the connection direction and surround the outside of multiple capacitors connected in series, the capacitive voltage divider adopts a new integral insulating sleeve, which can meet the requirements of higher voltage and high insulation performance while solving the technical problem of oil leakage risk.
[0009] According to an exemplary embodiment of the present application, the insulating sleeve is composited from a plurality of materials, and the plurality of materials includes silicone rubber.
[0010] In this way, the integrated insulating sleeve of the present application is composited from a variety of known materials including silicone rubber.
[0011] According to an exemplary embodiment of the present application, a metal flange is further included, connected between the wiring terminal and the insulating sleeve.
[0012] According to an exemplary embodiment of the present application, the number of the metal flange is one.
[0013] In this way, the integrated insulating sleeve of the present application is connected to the terminal block only by a metal flange at the initial connection, and there is no metal flange in the middle part of the insulating sleeve. Therefore, the integrated insulating sleeve reduces the risk of oil leakage and reduces the connection points.
[0014] According to an exemplary embodiment of the present application, insulating oil exists between the plurality of capacitors connected in series and the insulating sleeve.
[0015] According to an exemplary embodiment of the present application, the current received from the external power grid has a voltage of 550 KV.
[0016] In this way, the capacitive voltage divider using an integral insulating sleeve of the present application can be used for voltages of 550KV and above with excellent performance, thereby expanding and enriching the use scenarios of the capacitive voltage divider.
[0017] According to another aspect of the present application, a capacitive voltage transformer is provided, comprising the aforementioned capacitive voltage divider, including a tap drawn between any two capacitors among the plurality of capacitors connected in series; and an electromagnetic unit connected to the capacitive voltage divider via the tap.
[0018] In this way, the present application proposes a capacitive voltage transformer including a capacitive voltage divider and an electromagnetic unit using an integral insulating sleeve.
[0019] In an embodiment of the present application, a technical solution is provided for a capacitor voltage divider having a wiring terminal for receiving a high voltage current, a plurality of capacitors connected in series for current division, a novel composite integral insulating sleeve surrounding the outside, and a grounding terminal for grounding the capacitor, so as to at least solve the technical problems in the prior art of the capacitor voltage divider of the capacitive voltage transformer, such as poor mechanical properties, oil leakage risk, and high manufacturing cost, and achieve the technical effects of enhanced mechanical properties, reduced oil leakage risk, and reduced manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0021] Figure 1 is a schematic diagram showing a capacitive voltage transformer including a capacitive voltage divider using a novel composite integral insulating sleeve;
[0022] Reference Numbers
[0023] 1: Capacitor voltage divider;
[0024] 2: Electromagnetic unit;
[0025] 11: Terminal block;
[0026] 12: Multiple capacitors connected in series;
[0027] 13: Ground terminal;
[0028] 14: Insulation sleeve;
[0029] 15: Metal flange. DETAILED DESCRIPTION
[0030] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the embodiments described herein. In the accompanying drawings, for the sake of clarity, parts that are irrelevant to the description of the present application will be omitted. Similar reference numerals refer to similar elements throughout the description. In addition, when providing a description with reference to the accompanying drawings, although the elements are represented by the same numerals, the reference numerals relating to the elements may be changed, and the reference numerals are described only for the convenience of description, and should not be understood as the concept, feature, function or effect of the element being limited by the reference numeral.
[0031] At present, the traditional capacitive voltage divider using segmented porcelain sleeves as its outer insulating sleeve has many technical problems such as poor overall mechanical properties, easy breakage at the connection points, great risk of oil leakage, and high manufacturing cost.
[0032] In order to solve this technical problem, the capacitive voltage divider of the present application adopts a new composite integral insulating sleeve, so that the capacitive voltage divider can solve various technical problems existing in the prior art.
[0033] Figure 1 The present invention is a schematic diagram showing a capacitive voltage transformer including a capacitive voltage divider using a novel composite integral insulating sleeve.
[0034] The capacitive voltage transformer of the present application comprises a capacitive voltage divider 1 and an electromagnetic unit 2. The housing of the capacitive voltage divider 1 is fixed to the electromagnetic unit 2 by a physical connection method such as bolts.
[0035] The capacitive voltage divider 1 includes a terminal 11, a plurality of capacitors 12 connected in series, a grounding terminal 13 and an insulating sleeve 14. The terminal 11 is also called a terminal block, which is usually connected to a line with a large voltage, such as a 550KV voltage generated by a power plant, to receive a current with a large voltage from the line. A plurality of capacitors 12 connected in series are connected to the terminal 11 to receive the current, and divide the current with a large voltage through the principle of capacitive voltage division, for example, dividing the voltage of 550KV into 10KV. The grounding terminal 13 is connected to the last capacitor of the plurality of capacitors connected in series to ground the divided current, so that the capacitive voltage divider forms a complete loop.
[0036] Since the current flowing through the capacitor and its connecting wire has a relatively high voltage, an insulating sleeve with good insulation performance is required to insulate it from the external environment. Therefore, the insulating sleeve 14 surrounds the outside of the plurality of capacitors 12 connected in series. In addition, there is insulating oil between the plurality of capacitors 12 connected in series and the insulating sleeve 14, and the insulating oil further insulates the capacitor and the connecting wire from the external environment.
[0037] In addition, the insulating sleeve 14 adopts an integral structure, that is, it extends continuously from the connection terminal 11 or from the connection between the connection terminal 11 and the plurality of capacitors 12 connected in series along the connection direction of the plurality of capacitors 12 connected in series, forming a columnar structure surrounding the outside of the plurality of capacitors connected in series. The insulating sleeve 14 does not have a connection point caused by segmentation.
[0038] In addition, the capacitive voltage transformer is a single-column slender product, and it is necessary to ensure safety under the action of wind and earthquake forces. The domestic porcelain sleeve has poor strength, and due to the existing process, it is currently impossible to produce a porcelain sleeve that is not easy to break, not segmented, and has a long length. In response to this problem, the insulating sleeve 14 proposed in this application also adopts a composite material manufactured using existing technology, that is, the insulating sleeve 14 is composited by a variety of materials, and the various materials include silicone rubber. The various materials including silicone rubber are different from the ceramic materials in the prior art, and the mechanical properties are better than the ceramic materials, that is, when the diameter remains unchanged, although the length increases, it is not easy to break.
[0039] The insulating sleeve 14 made of composite material and integral structure has no connection points and is therefore not easily broken, which enhances the mechanical properties in case the capacitive voltage divider is too long. Since there are no connection points, the risk of leakage or seepage of the insulating oil in the sleeve is also reduced.
[0040] The capacitive voltage divider 1 further includes a metal flange 15 and the number of the metal flange 15 is only one. Different from the function of the metal flange connecting the previous section of the porcelain sleeve and the next section of the porcelain sleeve in the prior art, the metal flange 15 is connected between the terminal 11 and the insulating sleeve 14, that is, there is no metal flange 15 in the insulating sleeve 14 for connection. Therefore, this structure of the capacitive voltage divider 1 further reduces the risk of leakage or seepage of the insulating oil in the sleeve, and the reduction in the number of metal flanges 15 further reduces the manufacturing cost.
[0041] The capacitive voltage divider can receive high voltage and current of 550KV and above from external lines or power grids, which further expands the application scenarios of the capacitive voltage divider.
[0042] The capacitive voltage divider 1 further comprises a tap drawn from between any two capacitors of the plurality of capacitors connected in series, and the electromagnetic unit 2 is connected to the capacitive voltage divider 1 via the tap, wherein the tap and the corresponding connection are performed inside the housing.
[0043] The electromagnetic unit 2 receives the current after the initial voltage division from the capacitive voltage divider 1 through a tap connection, and then the electromagnetic unit 2 further performs a more refined secondary voltage division on the current according to customer needs, and transmits the secondary voltage division current to the equipment on the customer side, such as for further measurement, monitoring, transmission, etc. by the customer.
[0044] In an embodiment of the present application, a technical solution is provided for a capacitor voltage divider having a wiring terminal for receiving a high voltage current, a plurality of capacitors connected in series for current division, a novel composite integral insulating sleeve surrounding the outside, and a grounding terminal for grounding the capacitor, so as to at least solve the technical problems in the prior art of the capacitor voltage divider of the capacitive voltage transformer, such as poor mechanical properties, oil leakage risk, and high manufacturing cost, and achieve the technical effects of enhanced mechanical properties, reduced oil leakage risk, and reduced manufacturing cost.
[0045] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.
[0046] In the several embodiments provided in this application, it should be understood that the disclosed technical contents can be implemented in other ways.
[0047] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A capacitive voltage divider, characterized in that: The capacitive voltage divider comprises: A terminal block (11) connected to an external power grid to receive electric current; A plurality of capacitors (12) connected in series, connected to the connection terminals to receive the current and divide the current; A grounding terminal (13) connected to the last capacitor of the plurality of capacitors connected in series so that the divided current is grounded; The insulating sleeve (14) has a columnar structure extending continuously along the connection direction of the plurality of capacitors connected in series, and surrounds the outside of the plurality of capacitors connected in series.
2. The capacitive voltage divider according to claim 1, characterized in that: The insulating sleeve is composited from a plurality of materials, and the plurality of materials include silicone rubber.
3. The capacitive voltage divider according to claim 1, characterized in that: It also includes a metal flange (15) connected between the wiring terminal and the insulating sleeve.
4. The capacitive voltage divider according to claim 3, characterized in that: The number of the metal flange is one.
5. The capacitive voltage divider according to claim 1, characterized in that: Insulating oil exists between the plurality of capacitors connected in series and the insulating sleeve.
6. The capacitive voltage divider according to claim 1, characterized in that: The current received from the external power grid has a voltage of 550 KV.
7. A capacitive voltage transformer, characterized in that: include: The capacitive voltage divider (1) according to any one of claims 1 to 6, comprising a tap extending between any two capacitors of the plurality of capacitors connected in series; The electromagnetic unit (2) is connected to the capacitive voltage divider via the tap.