Capacitor tower and system for test

Abstract

The utility model discloses a test capacitor tower and system, comprising a tower body, a test auxiliary bus and a test side bus, the test auxiliary bus and the test side bus are respectively connected to the tower body from two ends of the tower body; the tower body sequentially comprises a plurality of tower layers from top to bottom, each tower layer is provided with a capacitor switching unit group, the adjacent capacitor switching unit groups are connected in parallel or in series, and the capacitor switching units can input or cut off one unit of capacitance; a series-parallel connection change-over switch group is arranged among the plurality of tower layers; comprising an auxiliary bus switch and a bypass bus switch, the test auxiliary bus and the test bypass bus are electrically connected with one end of the auxiliary bus switch and one end of the bypass bus switch respectively, and the other end of the auxiliary bus switch and the other end of the bypass bus switch are electrically connected with one capacitor switching unit group. The test auxiliary bus and the test side bus are standby for each other, so that the technical problem of wire inlet end requirements in various test conditions can be effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of capacitor towers, and in particular relates to a test capacitor tower and a system. Background Art

[0002] Circuit breakers, reactors and other equipment are widely used in power grid systems and various power transmission and distribution systems. In order to ensure the safe operation of the power grid, various defects must be eliminated through tests before the circuit breaker is put into operation. For example, various short circuits may occur in the power grid. When a short circuit occurs, the circuit breaker is required to quickly cut off the fault to avoid huge losses. Since the power grid has very high requirements on the reliability of the entire system during real-time operation, the circuit breaker must be inspected and certified for corresponding parameter performance before it is put into operation.

[0003] In the prior art, a single capacitor tower is usually used to conduct a capacitive load breaking test or a circuit breaker aging test on a circuit breaker. In the capacitor tower, capacitors are connected in series and parallel to form different compensation capacitor branches, and each branch is switched on and off according to the capacity required for the test. However, the capacity of a single capacitor tower is limited. As the breaking current of the circuit breaker continues to increase, the capacity of a single capacitor tower can no longer meet the needs of large current circuit breaker tests. Increasing the volume of the capacitor tower faces the difficulties of transportation difficulties and exponentially increased manufacturing costs. Utility Model Content

[0004] In view of the problems in the background technology, the purpose of the utility model is to provide a test capacitor tower, comprising a tower body, a test auxiliary bus and a test side bus, wherein the test auxiliary bus and the test side bus are respectively connected to the tower body from both ends of the tower body, and the device under test is connected through the test auxiliary bus or the test side bus during the test;

[0005] The tower body includes a plurality of tower layers from top to bottom, each of which is provided with a capacitor switching unit group, and adjacent capacitor switching unit groups are connected in parallel or in series;

[0006] The capacitor switching unit group includes a plurality of capacitor switching units connected in parallel, each of which can switch on or off a unit of capacitance, and each of which includes a switching switch and a capacitor connected in series;

[0007] It comprises a supplementary busbar and a bypass busbar, wherein the test supplementary busbar and the test bypass busbar are electrically connected to one end of the supplementary busbar and the bypass busbar respectively, and the other ends of the supplementary busbar and the bypass busbar are electrically connected to one of the capacitor switching unit groups;

[0008] The tower body is provided with several layers of mounting brackets from top to bottom, and adjacent mounting brackets and the mounting brackets at the bottom are connected to the ground through insulating support components; each layer of mounting brackets constitutes a tower layer, and the capacitor switching unit group is installed on the mounting brackets.

[0009] Preferably, a series-parallel switching switch group is provided between several of the tower layers, and the series-parallel switching switch group is configured to switch each of the adjacent capacitor switching unit groups between a parallel state and a series state.

[0010] Preferably, each of the tower layers is respectively provided with a layer bus, the layer bus is electrically connected to the capacitor switching unit group, and the auxiliary mother switch and the bypass mother switch are electrically connected to one of the layer bus bars.

[0011] Preferably, each tower layer is respectively provided with a capacitor bus, a plurality of the capacitors are electrically connected to the capacitor bus and connected in parallel through the capacitor bus, a plurality of the switching switches are electrically connected to the layer bus and connected in parallel through the layer bus, and the switching switches of the capacitor switching unit and the capacitors are electrically connected through wires.

[0012] Preferably, the insulating support assembly is a plurality of insulating support columns.

[0013] Preferably, it comprises a discharge coil connected in parallel with a plurality of the capacitor switching unit groups.

[0014] Preferably, the auxiliary mother switch and the side mother switch are both pneumatic isolating switches.

[0015] Based on the same concept, the utility model also provides a capacitor tower system, including a plurality of capacitor tower groups, each of which includes three test capacitor towers as described in any one of the above items.

[0016] Preferably, an inter-tower connecting switch is provided between adjacent test capacitor towers of each capacitor tower group, and both ends of the inter-tower connecting switch are respectively connected to the side mother switches of adjacent test capacitor towers.

[0017] Preferably, a wiring rack is provided on each side of the test capacitor tower, and three wiring posts are provided on the wiring rack. The test auxiliary busbars of the three test capacitor towers are respectively connected to the three wiring posts on one of the wiring racks, and the test side busbars are respectively connected to the three wiring posts on another wiring rack.

[0018] Due to the adoption of the above technical solution, the utility model has the following advantages and positive effects compared with the prior art:

[0019] 1. The two ends of the tower body of the utility model are respectively connected to the test auxiliary bus and the test side bus. The test auxiliary bus and the test side bus are backup for each other. The tower body can be connected from the test auxiliary bus or the test side bus, which can effectively solve the technical problems of the incoming line requirements in various test conditions.

[0020] 2. The utility model provides series-parallel switching switch groups between several tower layers, which can realize the series-parallel connection of each capacitor switching unit group on each tower layer, and can effectively increase the range of test current regulation.

[0021] 3. The capacitor switching unit of the utility model includes a switching switch and a capacitor connected in series. Each capacitor can be switched on or off through the switching switch, so that the adjustment accuracy is higher and the adjustment of the capacitance of each unit can be realized. It effectively solves the technical problem of continuous adjustment according to the fineness of the minimum unit capacitance when adjusting the capacitance from the minimum unit to the maximum parallel capacitance.

[0022] 4. The utility model is provided with an inter-tower connection switch, through which the inter-tower connection switch can realize the inter-tower connection of the test capacitor towers in series or in parallel, so as to increase the range of test current regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a front view of the capacitor tower system of the utility model;

[0025] Figure 2 This is a top view of the capacitor tower system of the utility model;

[0026] Figure 3 This is a front view of the test capacitor tower of the utility model;

[0027] Figure 4 This is a side view of the test capacitor tower of the utility model;

[0028] Figure 5 This is the circuit diagram of the capacitor tower group of the utility model;

[0029] Figure 6 This is the circuit diagram of the capacitor tower system of the utility model.

[0030] Description of reference numerals:

[0031] 1. Test auxiliary busbar; 2. Test bypass busbar; 3. First auxiliary busbar; 4. Second auxiliary busbar; 5. Layer busbar; 6. Inter-tower connecting switch; 7. Capacitor busbar; 8. Mounting bracket; 9. Insulating support column; 10. First tower layer; 11. Second tower layer; 12. Third tower layer; 13. First switch; 14. Second switch; 15. Third switch; 16. Fourth switch; 17. Fifth switch; 18. Terminal frame; 19. Terminal post; 20. Current transformer; 21. Switch-on / off switch; 22. Capacitor; 23. Discharge coil; 24. Parallel busbar. DETAILED DESCRIPTION

[0032] The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the utility model will become clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] Example 1

[0035] See also Figures 1 to 6 The core of the utility model is to provide a test capacitor tower, including a tower body, a test auxiliary bus 1 and a test side bus 2. The test auxiliary bus 1 and the test side bus 2 are connected to the tower body from both ends of the tower body respectively. During the test, the device under test is connected through the test auxiliary bus 1 or the test side bus 2. The test auxiliary bus 1 and the test side bus 2 are standby for each other. The tower body can be connected from the test auxiliary bus 1 or the test side bus 2, which can effectively solve the technical problem of the incoming line requirements in various test conditions.

[0036] It also includes a supplementary bus switch and a bypass bus switch 24. The test supplementary bus 1 and the test bypass bus 2 are electrically connected to one end of the supplementary bus switch and the bypass bus switch 24 respectively. In this embodiment, the supplementary bus switch and the bypass bus switch 24 are both pneumatic isolating switches that can be automatically switched. Of course, manual isolating switches can also be used in other embodiments.

[0037] The tower body includes several tower layers from top to bottom, and each tower layer is respectively provided with a capacitor switching unit group. Adjacent capacitor switching unit groups are connected in parallel or in series. The other ends of the auxiliary mother switch and the bypass mother switch 24 are electrically connected to one of the capacitor switching unit groups, so that the capacitor switching unit group can be electrically connected to the test auxiliary bus 1 and the test bypass bus 2 at the same time through the auxiliary mother switch and the bypass mother switch 24. When in use, the test auxiliary bus 1 or the test bypass bus 2 is selected to be connected to the tower body by opening one of the auxiliary mother switch and the bypass mother switch 24 and closing the other.

[0038] In this embodiment, two auxiliary mother switches are provided, namely a first auxiliary mother switch 3 and a second auxiliary mother switch 4. The first auxiliary mother switch 3 is connected to the test auxiliary bus 1, and both ends of the second auxiliary mother switch 4 are respectively connected to the first auxiliary mother switch 3 and one of the capacitor switching unit groups.

[0039] The capacitor switching unit group includes a plurality of capacitor switching units connected in parallel. The capacitor switching unit can switch on or off a unit of capacitance, so that the capacitance of the test capacitor tower can be flexibly adjusted during the test to meet different test requirements.

[0040] The capacitor switching unit specifically includes a switching switch 21 and a capacitor 22 connected in series. In this embodiment, the switching switch 21 and the capacitor 22 of the capacitor switching unit are electrically connected by a wire. Of course, other means can also be used for electrical connection in other embodiments. This embodiment is not specifically limited. The wire can specifically be a copper stranded wire. Each capacitor 22 can be switched on or off through the switching switch 21, so that the adjustment accuracy is higher, and the adjustment of the capacitance of each unit can be achieved, which effectively solves the technical problem of continuous adjustment according to the fineness of the minimum unit capacitance when adjusting the capacitance from the minimum unit to the maximum parallel capacitance.

[0041] A series-parallel switching switch group is also provided between several tower layers. The series-parallel switching switch group is configured to switch each adjacent capacitor switching unit group between a parallel state and a series state, thereby realizing the series-parallel connection of each capacitor switching unit group on each tower layer, and effectively increasing the range of test current regulation.

[0042] Each tower layer is provided with a layer bus 5, which is electrically connected to the capacitor switching unit group, and the second auxiliary mother switch 4 and the side mother switch 24 are electrically connected to the layer bus 5 of one of the tower layers. The layer bus 5 can be a tubular bus, a rectangular bus, etc., which is not specifically limited in this embodiment.

[0043] Each tower layer is respectively provided with a capacitor bus 7, a plurality of capacitors 22 are electrically connected to the capacitor bus 7 and connected in parallel through the capacitor bus 7, and a plurality of switching switches 21 are electrically connected to the layer bus and connected in parallel through the layer bus.

[0044] Specifically, the tower body is provided with several layers of mounting brackets 8 from top to bottom, and adjacent mounting brackets 8 and the bottommost mounting bracket 8 are connected to the ground through insulating support components, and in this embodiment, the insulating support components are several insulating support columns 9. Each layer of mounting brackets 8 constitutes a tower layer, and the capacitor switching unit group is installed on the mounting brackets 8.

[0045] See also Figure 1 , 2 The tower body is provided with three tower layers, which are the first tower layer 10, the second tower layer 11 and the third tower layer 12 from top to bottom. The second auxiliary mother switch 4 and the side mother switch 24 are electrically connected to the layer bus 5 of the first tower layer 10. The series-parallel switching switch group includes a first switch 13, a second switch 14, a third switch 15, a fourth switch 16 and a fifth switch 17. In this embodiment, the first switch 13, the second switch 14, the third switch 15, the fourth switch 16 and the fifth switch 17 are all pneumatic isolation switches.

[0046] One end of the first switch 13 is electrically connected to the layer bus 5 of the first tower layer 10, and the other end is electrically connected to the layer bus 5 of the second tower layer 11; one end of the second switch 14 is electrically connected to the layer bus 5 of the second tower layer 11, and the other end is electrically connected to the layer bus 5 of the third tower layer 12; one end of the third switch 15 is electrically connected to the capacitor bus 7 of the first tower layer 10 and the capacitor bus 7 of the second tower layer 11, and the other end is electrically connected to the capacitor bus 7 of the third tower layer 12 and is electrically connected to one end of the fifth switch 17; one end of the fourth switch 16 is electrically connected to the layer bus 5 of the third tower layer 12, and the other end is electrically connected to one end of the fifth switch 17; one end of the fifth switch 17 is electrically connected to the capacitor bus 7 of the third tower layer 12, and the other end is electrically connected to one end of the fourth switch 16.

[0047] When one tower layer is used, the third switch 15 and the fifth switch 17 are closed, and the first switch 13, the second switch 14, and the fourth switch 16 are opened.

[0048] When two tower layers are connected in series, the second switch 14 and the fourth switch 16 can be closed, and the first switch 13, the third switch 15 and the fifth switch 17 can be opened.

[0049] When two tower layers are connected in parallel, the first switch 13, the third switch 15, and the fifth switch 17 can be closed, and the second switch 14 and the fourth switch 16 can be opened.

[0050] When three tower layers are connected in parallel, the first switch 13, the second switch 14, the third switch 15, and the fifth switch 17 can be closed, and the fourth switch 16 can be opened.

[0051] The utility model also includes a discharge coil 23 connected in parallel with a plurality of capacitor switching unit groups. The discharge coil 23 is used for discharging the test capacitor tower of the utility model to release the electric energy stored in each capacitor 22.

[0052] The two ends of the tower body of the utility model are respectively connected to the test auxiliary bus 1 and the test side bus 2, the test auxiliary bus 1 and the test side bus 2 are backup for each other, and the tower body can be connected from the test auxiliary bus 1 or the test side bus 2, which can effectively solve the technical problems of the incoming line requirements in various test conditions.

[0053] Example 2

[0054] Another core of the present invention is a capacitor tower system, including a plurality of capacitor tower groups, each of which includes three test capacitor towers described in Example 1. In this embodiment, the capacitor tower system may include three capacitor tower groups.

[0055] An inter-tower connection switch 6 is provided between adjacent test capacitor towers of each capacitor tower group, and both ends of the inter-tower connection switch 6 are respectively connected to the side mother switches of adjacent test capacitor towers;

[0056] The inter-tower connection switch 6 is used to realize the star connection of three test capacitor towers, or to realize the use of two or three test capacitor towers in parallel as a unidirectional load. Specifically, when the line is incoming from A1, B1, and C1, KAB and KBC are closed, and the three test capacitor towers are three-phase star connection; when A1, B1, and C1 are short-circuited on the incoming line side, KAB and KBC are closed, and two or three test capacitor towers can be connected in parallel as a single-phase load.

[0057] See also Figure 1 A wiring rack 18 is provided on each side of the test capacitor tower, and three terminals 19 are provided on the wiring rack 18. The test auxiliary busbars of the three test capacitor towers are respectively connected to the three terminals 19 on one of the wiring racks 18, and the test side busbars are respectively connected to the three terminals 19 on the other wiring rack 18. A current transformer 20 is also provided at the bottom.

[0058] See also Figure 5 Circuit diagram, where A1, B1, C1 are the test busbar 1, A2, B2, C2 are the test side busbar 2, K7, K8, K9 are the first side busbar 3, K1, K2, K3 are the second side busbar 4, K4, K5, K6 are the side busbar 24, KAB, KBC are the inter-tower connection switches 6, TAa, TAb and TAc are the three test capacitor towers of the capacitor tower group. 1G1, 2G1 and 3G1 are the first switch 13, 1G2, 2G2 and 3G2 are the second switch 14, 1G3, 2G3 and 3G3 are the third switch 15, 1G4, 2G4 and 3G4 are the fourth switch 16, 1G5, 2G5 and 3G5 are the fifth switch 17.

[0059] The capacitor tower system of the utility model can effectively meet the test requirements of equipment such as circuit breakers with large currents, and it is very convenient to connect wires and adjust the capacitance during the test.

[0060] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A test capacitor tower, characterized in that: It comprises a tower body, a test auxiliary bus and a test side bus, wherein the test auxiliary bus and the test side bus are respectively connected to the tower body from two ends of the tower body, and the equipment under test is connected through the test auxiliary bus or the test side bus during the test; The tower body includes a plurality of tower layers from top to bottom, each of which is provided with a capacitor switching unit group, and adjacent capacitor switching unit groups are connected in parallel or in series; The capacitor switching unit group includes a plurality of capacitor switching units connected in parallel, each of which can switch on or off a unit of capacitance, and each of which includes a switching switch and a capacitor connected in series; It comprises a supplementary busbar and a bypass busbar, wherein the test supplementary busbar and the test bypass busbar are electrically connected to one end of the supplementary busbar and the bypass busbar respectively, and the other ends of the supplementary busbar and the bypass busbar are electrically connected to one of the capacitor switching unit groups; The tower body is provided with several layers of mounting brackets from top to bottom, and adjacent mounting brackets and the mounting brackets at the bottom are connected to the ground through insulating support components; each layer of mounting brackets constitutes a tower layer, and the capacitor switching unit group is installed on the mounting brackets.

2. The test capacitor tower according to claim 1, characterized in that: A series-parallel switching switch group is provided between the tower layers, and the series-parallel switching switch group is configured to switch each adjacent capacitor switching unit group between a parallel state and a series state.

3. The test capacitor tower according to claim 2, characterized in that: Each tower layer is respectively provided with a layer bus, the layer bus is electrically connected to the capacitor switching unit group, and the auxiliary mother switch and the bypass mother switch are electrically connected to one of the layer bus bars.

4. The test capacitor tower according to claim 3, characterized in that: Each tower layer is respectively provided with a capacitor bus, a number of the capacitors are electrically connected to the capacitor bus and connected in parallel through the capacitor bus, a number of the switching switches are electrically connected to the layer bus and connected in parallel through the layer bus, and the switching switches of the capacitor switching unit and the capacitors are electrically connected through wires.

5. The test capacitor tower according to claim 1, characterized in that: The insulating support assembly is a plurality of insulating support columns.

6. The test capacitor tower according to claim 1, characterized in that: It comprises a discharge coil connected in parallel with a plurality of capacitor switching unit groups.

7. The test capacitor tower according to claim 1, characterized in that: The auxiliary mother switch and the side mother switch are both pneumatic isolating switches.

8. A capacitor tower system, characterized in that: It comprises a plurality of capacitor tower groups, each of which comprises three test capacitor towers according to any one of claims 1 to 7.

9. The capacitor tower system according to claim 8, characterized in that: An inter-tower connection switch is provided between adjacent test capacitor towers of each capacitor tower group, and both ends of the inter-tower connection switch are respectively connected to the bypass mother switches of adjacent test capacitor towers.

10. The capacitor tower system according to claim 8, characterized in that: A wiring rack is provided on each side of the test capacitor tower, and three wiring posts are provided on the wiring rack. The test auxiliary busbars of the three test capacitor towers are respectively connected to the three wiring posts on one of the wiring racks, and the test side busbars are respectively connected to the three wiring posts on another wiring rack.

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