CN108267676A - A kind of novel ac voltage withstanding detection device - Google Patents

Abstract

The present invention relates to power safety technique fields, more particularly to a kind of novel ac voltage withstanding detection device, including epoxy bilateral casing, insulation sleeve, copper rod, the insulation sleeve is socketed on epoxy bilateral casing, the copper rod is interspersed in as conductor in epoxy bilateral casing, one end of the copper rod is used to be inserted into the T-shaped connector of threephase cable with the casing connection of epoxy bilateral using screw thread, and the other end end of the copper rod is designed as wire connection terminal panel for joint test transformer.The device of the design can be applied in the industrial frequency AC pressure resistance field test of 20/10kV voltage class switch cabinet body, cable and cable connectors, can the T-shaped connector of disposable test threephase cable, and have good operability.

Description

A new type of AC withstand voltage detection device

technical field

The invention relates to the technical field of electric power safety, in particular to a novel AC withstand voltage detection device.

Background technique

Before using the gas insulated switchgear, a power frequency AC withstand voltage test is required. The purpose of the power frequency AC withstand voltage test is to check whether the insulation performance of the overall assembly is intact, and to prevent damage and foreign objects during transportation, storage, installation and commissioning. The situation arises. The objects of power frequency AC withstand voltage test include switch cabinet body, cables and cable connectors. In the past tests, the three types of components need to be tested separately for AC withstand voltage, which takes a long time and easily affects the construction progress; in order to save time, the test of the cable connector is often neglected, causing great safety hazards.

Contents of the invention

In order to solve the above-mentioned technical defects, the present invention provides a new type of AC withstand voltage detection device. The device of this design can be applied to the power frequency AC withstand voltage field test of 20/10kV voltage level switchgear cabinets, cables and cable connectors Among them, the three-phase cable T-connector can be tested at one time, and it has good operability.

The technical solution of the present invention is: a new type of AC withstand voltage detection device, including an epoxy double-pass bushing, an insulating sleeve, and a copper rod, the insulating sleeve is sleeved on the epoxy double-pass bushing, and the copper rod is used as a conductor Interspersed in the epoxy two-way sleeve, one end of the copper rod is threaded and connected to the epoxy two-way sleeve for inserting into the T-shaped connector of the three-phase cable, and the other end of the copper rod is designed as a terminal Panel for connection to the test transformer.

Further, the epoxy double-way bushing includes a socket part and a socket part, the insulating sleeve is screwed on the socket part to realize full wrapping, and the socket part is used for inserting into a T-shaped connector of a three-phase cable.

Further, a resistance ring is provided between the socket part and the socket part for fixing the insulating sleeve, so that the insulating sleeve and the socket part are socketed and fastened.

Further, one end of the copper rod protrudes from the socket to connect with the conductor at the insertion port of the three-phase cable T-shaped connector, and the other end of the copper rod protrudes from the socket to connect to the test transformer.

Further, the shape of the socket part coincides with the shape of the insertion port of the T-shaped connector of the three-phase cable.

Further, the insulating sleeve is designed with silicone rubber and an umbrella skirt.

The device consists of an epoxy double-way bushing and a silicone rubber insulating sleeve. The silicone rubber insulating sleeve is designed with an umbrella skirt. The surface creepage distance is ≥700mm. The center of the epoxy double-way bushing uses a copper rod as a conductor, and one end of the copper rod is threaded and The epoxy double-way bushing is connected, and the other end is designed with a terminal panel to better connect with the test transformer. The epoxy double-way bushing is a common structure for 10kV and 20kV, which can meet the requirements of 10kV and 20kV detachable cable T-type connectors Assembled, pre-assembled as a whole, can withstand a withstand voltage of 4.5 times the rated voltage, without breakdown or flashover.

In the state where the cable and cable T-shaped connector are connected to the switch cabinet, one end of the cable T-shaped connector is connected to the three-phase tapered bushing in the switch cabinet, one end is connected to the cable, and the remaining end is plugged with an insulating plug; During the withstand voltage test, remove the insulation blockage from the insertion port, insert the socket part of the detection device into the insertion port of the cable T-shaped connector, ensure that the device is in good contact with the cable T-shaped connector, and connect the copper rod with the terminal panel One end of the switchgear is connected to the test transformer after three-phase short-circuit, start the test transformer to boost the test voltage, maintain the test voltage for a specified time, and the switchgear cabinet, cables and cable connectors will not break down or flashover within the specified time, that is, The insulation test is qualified.

The existing withstand voltage detection device performs the withstand voltage test through the three-phase tapered bushing directly connected in the switch cabinet, and ignores the withstand voltage test on the cable and the cable connector. This design can realize the withstand voltage test of the switch cabinet body, cables and cable connectors at the same time, which makes up for the defects of the prior art and solves the problem.

The beneficial effects of the present invention are;

1. This design can realize simultaneous power frequency withstand voltage test on the 20/10kV switchgear cabinet body, cables and cable connectors at the construction site, so as to ensure the quality of components put into operation in the distribution network, and reduce the localization of switchgear and cable accessories. Failure rate caused by excessive discharge;

2. This design is convenient and quick to operate, and one person can complete the test, which can reduce manpower input and improve man-machine efficiency.

3. The interface of this design is consistent with the assembled cable connectors in the switch cabinet, which is suitable for on-site testing.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a schematic cross-sectional view of FIG. 1 .

Fig. 3 is a schematic diagram of the implementation of the present invention.

Detailed ways

The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

Example 1:

As shown in Figures 1 to 3, a new type of AC withstand voltage detection device includes epoxy double-pass bushing 1, insulating sleeve 2, and copper rod 3. Epoxy double-pass bushing 1 includes socket 11 and socket Part 12, the insulating sleeve 2 is threaded on the socket part 11 to realize full wrapping, the socket part 12 is used to insert the T-shaped connector of the three-phase cable, and the shape of the socket part 12 is consistent with the insertion port of the T-shaped connector of the three-phase cable The shape of the copper rod 3 is inserted in the epoxy double-pass sleeve 1 as a conductor, and one end of the copper rod 3 extends out of the socket part 12 to connect with the conductor of the three-phase cable T-shaped connector insertion port. The copper rod 3 The other end is designed as a terminal panel and extends out of the socket 11 to connect with the test transformer.

Wherein, a blocking ring 13 is provided between the socket portion 11 and the socket portion 12 for fixing the insulating sleeve 2 so that the insulating sleeve 2 and the socket portion 11 are socketed and fastened.

Wherein, the insulating sleeve 2 is designed with silicone rubber and an umbrella skirt.

The device is composed of epoxy double-way bushing 1 and silicone rubber insulating sleeve 2. The silicone rubber insulating sleeve 2 is designed with an umbrella skirt, and the surface creepage distance is ≥700mm. One end of rod 3 is threaded to connect with epoxy double-pass bushing 1, and the other end is designed with a terminal panel to better connect with the test transformer. Epoxy double-pass bushing 1 has a general structure of 10kV and 20kV, which can meet 10kV and 20kV Detachable cable T-connector assembly, pre-assembled as a whole, can withstand a withstand voltage of 4.5 times the rated voltage, without breakdown or flashover.

In the state where the cable and cable T-shaped connector are connected to the switch cabinet, one end of the cable T-shaped connector is connected to the three-phase tapered bushing in the switch cabinet, one end is connected to the cable, and the remaining end is plugged with an insulating plug; During the withstand voltage test, remove the insulation blockage from the insertion port, insert the socket part 12 of the detection device into the insertion port of the cable T-shaped connector, ensure that the device is in good contact with the cable T-shaped connector, and connect the copper rod 3 with the wiring One end of the terminal panel is connected to the test transformer after three-phase short circuit, start the test transformer to boost the test voltage, maintain the test voltage for a specified time, and the switchgear cabinet, cables and cable connectors will not break down or flashover within the specified time , that is, the insulation test is qualified.

The existing withstand voltage detection device performs the withstand voltage test through the three-phase tapered bushing directly connected in the switch cabinet, and ignores the withstand voltage test on the cable and the cable connector. This design can realize the withstand voltage test of the switch cabinet body, cables and cable connectors at the same time, which makes up for the defects of the prior art and solves the problem.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (6)

1. a kind of novel ac voltage withstanding detection device, which is characterized in that including epoxy bilateral casing（1）, insulation sleeve（2）, copper rod （3）, the insulation sleeve（2）It is socketed in epoxy bilateral casing（1）On, the copper rod（3）Epoxy bilateral set is interspersed in as conductor Pipe（1）It is interior, the copper rod（3）One end using screw thread and epoxy bilateral casing（1）Connection, for being inserted into the T-shaped company of threephase cable Connector, the copper rod（3）Other end end be designed as wire connection terminal panel, for joint test transformer.

A kind of 2. novel ac voltage withstanding detection device according to claim 1, which is characterized in that the epoxy bilateral casing （1）Including socket part（11）And female part（12）, the insulation sleeve（2）Screw thread is socketed in socket part（11）The upper full package of realization, The female part（12）For being inserted into the T-shaped connector of threephase cable.

A kind of 3. novel ac voltage withstanding detection device according to claim 2, which is characterized in that the socket part（11）With hold Interpolating unit（12）Between be equipped with balk ring（13）For fixing insulation sleeve（2）, make insulation sleeve（2）With socket part（11）Socket fastening.

A kind of 4. novel ac voltage withstanding detection device according to claim 2, which is characterized in that the copper rod（3）One end Stretch out female part（12）It is connect with the electric conductor of the T-shaped connector insert port of threephase cable, the copper rod（3）The other end stretch out set Socket part（11）It is connect with testing transformer.

A kind of 5. novel ac voltage withstanding detection device according to claim 4, which is characterized in that the female part（12）Shape Shape matches with the shape of the T-shaped connector insert port of threephase cable.

A kind of 6. novel ac voltage withstanding detection device according to claim 1, which is characterized in that the insulation sleeve（2）Using Silicon rubber is simultaneously designed with full skirt.