CN211122944U - Special adapter for GIS cable terminal test - Google Patents

Abstract

The utility model relates to a special conversion joint for GIS cable terminal test, which comprises a high-voltage test lead wire and a variable diameter screw rod. The diameter of one end of the reducer screw matches the threaded hole at the GIS end of the high-voltage test lead, and the diameter of the other end of the reducer screw matches the bolt hole at the grounding end of the GIS grounding knife switch. The application of this device can greatly improve the test efficiency and improve the accuracy of fault location.

Description

A special conversion joint for GIS cable terminal test

technical field

The utility model belongs to the technical field of high-voltage testing, and relates to a GIS cable terminal testing technology of 110kV and above, in particular to a special conversion joint for GIS cable terminal testing.

Background technique

The high-voltage power cable fault finding test is the primary diagnostic test item after the fault trip of the cable line. It is of great significance for discovering that the main insulation of the cable is damp, aging and serious partial discharge breakdown, as well as quickly and accurately finding the location of the fault point.

For the fault finding test of the all-cable transmission line with GIS incoming lines on both sides of the station, it is necessary to open the grounding switch of the line at one side of the station. It is necessary to remove the grounding bar of the static contact of the GIS line grounding switch, and then use the bolt to connect the high-voltage test lead to the cable under test after the line grounding switch is closed. Because of the test The voltage is relatively high (generally around 30kV ~ 70kV), and the entire cable line is capacitive, which leads to the following problems:

1. The faulty cable is a high-resistance fault and the fault point is far away from the cable line. When the grounding bar is disconnected, the residual charge in the cable can easily cause personal electric shock accidents; The risk of induced electric shock caused by the staff connected to the high-voltage lead wire;

2. Since the grounding terminal of the static contact of the GIS grounding knife gate cannot guarantee a sufficient safety distance from the ground potential (the bolts at the grounding terminal of the static contact are short and small, the opening of the high-voltage test clamp is large and there is no insulation), it is necessary to repeatedly adjust the contact between the high-voltage test clamp and the bolt The test can be carried out only if the position and the external auxiliary multiple insulation are required. Even so, the fault reflection waveform is extremely unsatisfactory because the bolt cannot be connected with the static contact of the grounding switch, which seriously affects the accurate judgment of the fault point;

3. The high-voltage test clamp is clamped on a short bolt, and the insulating tape wrapped around the test clamp is not tight. If the high-voltage lead wire falls off during the high-voltage test process, it will easily cause casualties and equipment damage; therefore, ensure that the high-voltage lead wire is connected to the ground. The reliable connection of the knife gate static contact bolt is particularly important.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, provide a special conversion joint for GIS cable terminal test, and solve the problems existing in the whole cable line fault finding test process of the double-sided GIS cable terminal of 110kV and above.

The technical scheme adopted by the utility model to solve the technical problem is:

A special conversion joint for GIS cable terminal test, including a high-voltage test lead and a reducing screw. The diameter of one end of the rod matches the threaded hole of the GIS end of the high-voltage test lead, and the diameter of the other end of the variable diameter screw rod matches the bolt hole of the grounding end of the GIS grounding knife switch.

Moreover, a high-voltage test lead is matched with multiple reducing screw rods, and the diameters of the terminals connected with the GIS end of the high-voltage test lead wire are the same, and the diameters of the terminals connected with the grounding terminal of the GIS grounding knife switch are different.

Moreover, both ends of the high-voltage test lead are respectively wrapped with high-voltage insulating sleeves.

Moreover, the diameter of the end connecting the reducing screw rod with the grounding end of the GIS grounding knife gate is 12-16 mm, and the diameter of the end connecting the reducing screw rod and the GIS end of the high-voltage test lead is 8.7 mm.

The advantages and positive effects of the present utility model are:

1. Reduce power outage time and improve power supply reliability. During the field test, the high-voltage test clamp is clamped on the short bolt, and the insulating tape wrapped around the test clamp is not tight. If the high-voltage lead wire falls off during the high-voltage test, it will easily cause casualties and equipment damage; while disassembling and assembling the ground terminal . It takes 1-2 hours to adjust the position of the test clamp to wrap the insulation and fix it, and the single test time of the adapter is shortened to 0.5 hours;

2. Reduce safety risks and strengthen intrinsic safety. Operators operate by holding the adapter with insulating sheath, avoiding the risk of high-voltage electric shock;

3. Improve work efficiency and positioning accuracy. The application of this device can greatly improve the test efficiency and improve the accuracy of fault location.

Description of drawings

Fig. 1 is the structure diagram of this conversion joint;

Figure 2 is a structural diagram of a variable diameter screw.

Detailed ways

The present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present utility model.

A special conversion joint for GIS cable terminal test, comprising a high-voltage test lead 3 and a plurality of reducing screw rods 5, the two ends of the high-voltage test lead are respectively a GIS end 4 and a vehicle end 2, and the reducing screw rod is threadedly connected at the GIS end, The diameter of one end of the variable diameter screw matches the threaded hole of the GIS end of the high-voltage test lead, and the diameter of the other end of the variable diameter screw matches the bolt hole of the ground terminal 6 of the GIS grounding switch. Select different reducing screw for the size of the bolt hole, then screw one end of the reducing screw into the GIS end of the high-voltage test lead conversion joint, and then screw the other end of the reducing screw into the bolt hole of the grounding end of the GIS grounding knife switch Finally, connect the vehicle end of the high-voltage test lead to the high-voltage lead end 1 of the test vehicle, so as to realize a safe, reliable and fast electrical connection and create conditions for the rapid search of cable fault points.

The outside of the adapter is wrapped by a high-voltage insulating sleeve, so as to ensure a safe distance from the grounding terminal during the test and effectively prevent the risk of personal electric shock when connecting to the GIS grounding switch;

The adaptor is firmly connected with the high-voltage lead wire of the test vehicle by the docking method, and the installation and disassembly are very convenient, which can ensure that the high-voltage lead wire will not fall off during the test process, and save a lot of test time at the same time.

The invention greatly improves the efficiency of the test and saves the test time, thereby ensuring that the tested equipment is put into operation on time, reducing the power outage time and saving a lot of money for the company.

The above are only the preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the utility model, several modifications and improvements can be made, which belong to the present invention. The scope of protection of the utility model.

Claims (4)

1. The utility model provides a GIS cable termination tests special crossover sub which characterized in that: the high-voltage test device comprises a high-voltage test lead and a reducing screw rod, wherein a GIS end and a vehicle end are respectively arranged at two ends of the high-voltage test lead, the reducing screw rod is in threaded connection with the GIS end, one end of the reducing screw rod is matched with a threaded hole at the GIS end of the high-voltage test lead, and the other end of the reducing screw rod is matched with a bolt hole at the grounding end of a GIS grounding switch.

2. The adapter special for the GIS cable termination test according to claim 1, characterized in that: a high-voltage test lead wire matches a plurality of reducing lead screws, the diameter of the end head connected with the GIS end of the high-voltage test lead wire is the same, and the diameter of the end head connected with the grounding end of the GIS grounding switch is different.

3. The adapter special for the GIS cable termination test according to claim 1, characterized in that: two ends of the high-voltage test lead are respectively wrapped by the high-voltage insulating sleeves.

4. The GIS cable termination test dedicated adapter connector of claim 1 or 2, characterized in that: the diameter of the end of the reducing screw rod connected with the grounding end of the GIS grounding disconnecting link is 12-16 mm, and the diameter of the end of the reducing screw rod connected with the GIS end of the high-voltage test lead is 8.7 mm.

Images