Power frequency test double-break disconnector

Abstract

The utility model discloses a double-break isolation switch for power frequency test, which comprises a shell, a movable contact, a busbar end contact, an outgoing line end contact and two grounding contacts. The busbar end contact, the outgoing line end contact and the two grounding contacts are installed in the shell. The busbar end contact and the outgoing line end contact are oppositely arranged, and the two grounding contacts are oppositely arranged. The movable contact is rotatably arranged in the shell. The two ends of the movable contact movably contact the movable contact, the busbar end contact, the outgoing line end contact and the two grounding contacts. When the movable contact is in a test state, the two ends of the movable contact contact the busbar end contact and the outgoing line end contact respectively, and the two grounding contacts are respectively arranged on the two sides of the movable contact. When the movable contact is in a grounding state, the two ends of the movable contact contact the two grounding contacts respectively, and the busbar end contact and the outgoing line end contact are respectively arranged on the two sides of the movable contact. The utility model can ensure the operation safety of operating the high-voltage switch equipment when the busbar is electrified.

Description

Technical Field

[0001] This utility model relates to the field of high voltage switchgear, and in particular to a double-break disconnect switch for power frequency testing. Background Technology

[0002] In current high-voltage switchgear testing, the busbar connects to multiple high-voltage switchgear units via multiple disconnectors, with each unit connected to the busbar's power output through a disconnector. However, the disconnectors used in current power frequency withstand voltage tests are single-break disconnectors. When the disconnector opens, the contact at the disconnector's output end (connected to the high-voltage switchgear) senses the voltage at the busbar contact (used for connection), creating an induced voltage. This causes the disconnector's output contact to become energized, posing a safety risk to operators performing operations on the high-voltage switchgear connected to the disconnector's output end under these conditions. Therefore, currently, operating any high-voltage switchgear connected to a particular disconnector's output end requires de-energizing the busbar to ensure operational safety. However, de-energizing the busbar de-energizes all high-voltage switchgear connected to the disconnectors' output ends, affecting the power frequency withstand voltage tests of other high-voltage switchgear units.

[0003] In view of the above problems, it is necessary to study a double-break disconnect switch for power frequency testing, which can ensure the operational safety of operating high-voltage switchgear when the busbar is energized. Utility Model Content

[0004] The purpose of this utility model is to provide a double-break disconnect switch for power frequency testing, which can ensure the operational safety of high-voltage switchgear when the busbar is energized.

[0005] To achieve the above objectives, the solution of this utility model is: A double-break disconnector for power frequency testing includes a housing, a moving contact, a busbar end contact, an outgoing end contact, and two grounding contacts. The busbar end contact, outgoing end contact, and two grounding contacts are mounted in the housing, with the busbar end contact and outgoing end contact facing each other, and the two grounding contacts facing each other as well. The moving contact is rotatably disposed in the housing, and its two ends move in contact with the moving contact, busbar end contact, outgoing end contact, and two grounding contacts. The moving contact switches between a test state and a grounding state. When the moving contact is in the test state, its two ends contact the busbar end contact and the outgoing end contact, respectively, and the two grounding contacts are located on both sides of the moving contact. When the moving contact is in the grounding state, its two ends contact the two grounding contacts, respectively, and the busbar end contact and the outgoing end contact are located on both sides of the moving contact.

[0006] The aforementioned double-break disconnect switch for power frequency testing also includes an insulating torsion bar, which is rotatably mounted in the housing, and the center of the moving contact is connected to the insulating torsion bar.

[0007] The aforementioned double-break disconnect switch for power frequency testing also includes a connecting rod to an insulating torsion bar and a rocker arm connected to the connecting rod. The connecting rod rotatably passes through the housing and is sealed to the housing, while the rocker arm is located outside the housing.

[0008] The two ends of the busbar end contact are respectively connected to the shell through the first basin-type insulator.

[0009] The outgoing terminal contact is locked to the housing by a second basin-type insulator.

[0010] The grounding contact is welded to the housing.

[0011] With the above scheme adopted, the double-break disconnector for power frequency testing of this utility model, when in use, has the busbar end contact for connecting to the busbar, the outgoing end contact for connecting to the high-voltage switchgear, and two grounding contacts for grounding; when the moving contact rotates to the test state, the two ends of the moving contact contact the busbar end contact and the outgoing end contact respectively, so that the busbar end contact and the outgoing end contact are connected through the moving contact, and at this time the voltage of the busbar is output to the high-voltage switchgear for power frequency withstand voltage testing; and when the moving contact rotates to the grounding state, the two ends of the moving contact are connected to the busbar end contact and the outgoing end contact respectively, so that the busbar end contact and the outgoing end contact are connected through the moving contact, and the voltage of the busbar is output to the high-voltage switchgear for power frequency withstand voltage testing; and when the moving contact rotates to the grounding state, the two ends of the moving contact are connected to the busbar end contact and the outgoing end contact are connected through the moving contact. Avoid touching the two grounding contacts to ground the moving contact. The bus end contact and the outgoing end contact are respectively located on both sides of the moving contact. At this time, a voltage isolation break is formed between the moving contact and the bus end contact, and a grounding port is formed between the moving contact and the outgoing end contact. In this way, the outgoing end contact will not induce a voltage in the bus end contact, that is, the outgoing end contact is not energized. At this time, the test personnel can safely operate the high-voltage switchgear connected to the outgoing end contact without interrupting the power supply to the bus, ensuring the safety of the test personnel. Attached Figure Description

[0012] Figure 1 A cross-sectional view of this utility model Figure 1 (Test status).

[0013] Figure 2 A cross-sectional view of this utility model Figure 2 (Test status).

[0014] Figure 3 A cross-sectional view of this utility model Figure 3 (Grounded state).

[0015] Label Explanation: 1. Housing; 2. Moving contact; 3. Busbar end contact; 4. Outgoing line end contact; 5. Grounding contact; 6. Insulating torsion bar; 7. Connecting rod; 8. Rocker arm; 9. First basin insulator; 10. Second basin insulator. Detailed Implementation

[0016] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0017] like Figures 1 to 3 As shown, this utility model discloses a double-break disconnect switch for power frequency testing, which includes a housing 1, a moving contact 2, a busbar end contact 3, an outgoing end contact 4, and two grounding contacts 5; wherein, the busbar end contact 3, the outgoing end contact 4, and the two grounding contacts 5 are installed in the housing 1, the busbar end contact 3 and the outgoing end contact 4 are arranged opposite to each other, and the two grounding contacts 5 are arranged opposite to each other; the moving contact 2 is rotatably disposed in the housing 1, and the two ends of the moving contact 2 are in active contact with the moving contact 2. The moving contact 2 consists of a busbar end contact 3, an outgoing line end contact 4, and two grounding contacts 5. The moving contact 2 switches between test and grounding states. When the moving contact 2 is in test state, its two ends contact the busbar end contact 3 and the outgoing line end contact 4, respectively, and the two grounding contacts 5 are located on both sides of the moving contact 2. When the moving contact 2 is in grounding state, its two ends contact the two grounding contacts 5, respectively, and the busbar end contact 3 and the outgoing line end contact 4 are located on both sides of the moving contact 2.

[0018] In use, the double-break disconnector for power frequency testing of this utility model has the following components: busbar end contact 3 is used to connect to the busbar, output end contact 4 is used to connect to the high-voltage switchgear, and two grounding contacts 5 are used for grounding. When the moving contact 2 rotates to the test state, its two ends contact the busbar end contact 3 and the output end contact 4 respectively, making the busbar end contact 3 and the output end contact 4 conductive through the moving contact 2. At this time, the voltage of the busbar is output to the high-voltage switchgear for power frequency withstand voltage testing. When the moving contact 2 rotates to the grounding state, its two ends contact the two grounding contacts 5 respectively. The grounding contact 5 grounds the moving contact 2. The bus end contact 3 and the outgoing end contact 4 are located on both sides of the moving contact 2. At this time, a voltage isolation break is formed between the moving contact 2 and the bus end contact 3, and a grounding port is formed between the moving contact 2 and the outgoing end contact 4. In this way, the outgoing end contact 4 will not sense the voltage of the bus end contact 3 and form an induced voltage, that is, the outgoing end contact 4 is not energized. At this time, the test personnel can safely operate the high-voltage switchgear connected to the outgoing end contact 4 without interrupting the power supply to the bus, ensuring the safety of the test personnel.

[0019] In an embodiment of this utility model, the double-break disconnect switch for power frequency testing may further include an insulating torsion bar 6, a connecting rod 7, and a rocker arm 8. The insulating torsion bar 6 is rotatably disposed in the housing 1, and the center of the moving contact 2 is connected to the insulating torsion bar 6. The connecting rod 7 is rotatably disposed through the housing 1 and is sealed to the housing 1. One end of the connecting rod 7 is connected to the insulating torsion bar 6, and the other end of the connecting rod 7 is connected to the rocker arm 8. The rocker arm 8 is located outside the housing 1. The tester drives the connecting rod 7, the insulating torsion bar 6, and the moving contact 2 to rotate through the rocker arm 8. The insulating torsion bar 6 can prevent the moving contact 2 from being electrically connected to the housing 1.

[0020] In an embodiment of this utility model, the two ends of the busbar end contact 3 can be connected to the housing 1 respectively through the first basin-type insulator 9, and the first basin-type insulator 9 can prevent the busbar end contact 3 from being electrically connected to the housing 1.

[0021] In an embodiment of this utility model, the outgoing contact 4 is locked to the housing 1 by a second basin-type insulator 10, and the second basin-type insulator 10 can prevent the outgoing contact 4 from being electrically connected to the housing 1.

[0022] In an embodiment of this utility model, the grounding contact 5 is welded to the housing 1, so that the grounding contact 5 is grounded through the housing 1.

[0023] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A double-break disconnect switch for power frequency testing, characterized in that: It includes a housing, a moving contact, a busbar end contact, an outgoing end contact, and two grounding contacts; Busbar end contacts, outgoing end contacts, and two grounding contacts are installed in the housing. The busbar end contacts and outgoing end contacts are arranged opposite each other, and the two grounding contacts are arranged opposite each other. The moving contact is rotatably mounted in the housing, and its two ends make contact with the moving contact, the busbar end contact, the outgoing line end contact, and two grounding contacts; the moving contact switches between test state and grounding state. When the moving contact is in the test state, the two ends of the moving contact are in contact with the bus end contact and the outgoing line end contact respectively, and the two grounding contacts are located on both sides of the moving contact. When the moving contact is in the grounded state, both ends of the moving contact are in contact with two grounded contacts respectively, and the bus end contact and the outgoing end contact are located on both sides of the moving contact respectively.

2. The double-break disconnect switch for power frequency testing as described in claim 1, characterized in that: It also includes an insulating torsion bar, which is rotatably mounted in the housing, with the center of the moving contact connected to the insulating torsion bar.

3. The double-break disconnect switch for power frequency testing as described in claim 2, characterized in that: It also includes a connecting rod to the insulated torsion bar and a rocker arm connected to the connecting rod. The connecting rod rotatably passes through the housing and is sealed to the housing. The rocker arm is located outside the housing.

4. The double-break disconnect switch for power frequency testing as described in claim 1, characterized in that: The two ends of the busbar end contact are respectively connected to the shell through the first basin-type insulator.

5. The double-break disconnect switch for power frequency testing as described in claim 1, characterized in that: The outgoing terminal contact is locked to the housing by a second basin-type insulator.

6. The double-break disconnect switch for power frequency testing as described in claim 1, characterized in that: The grounding contact is welded to the housing.

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