CN106159758B - Ring main unit, which does not have a power failure, accesses the servicing unit of cable - Google Patents

Abstract

The invention discloses an auxiliary device for connecting a cable without power failure in a ring network cabinet. A terminal block (1) is installed in the cabinet body (2) of the ring network cabinet, and an outer sheath made of full insulating material is installed on the terminal block (1). T-shaped front connector (5), T-shaped front connector (5) is installed with terminal studs (6), the No. 1 terminal (7) of the running cable is connected to the terminal block (1) through the The No. 1 wire nut (8) is compressed; the feature is: the ring network cabinet is equipped with an auxiliary device for uninterrupted power access, and the auxiliary device includes two parts: a protective baffle for auxiliary insulation and a bridge mechanism for auxiliary connection; The invention has simple structure and convenient operation, and solves the problem that the ring main unit without a spare interval is connected to the bypass cable without power failure.

Description

Auxiliary device for connecting cables to the ring network cabinet without power failure

technical field

The invention relates to tooling for bypass operation without power failure, in particular to an auxiliary device for connecting cables to a ring network cabinet without power failure.

Background technique

With the continuous development of urban distribution networks, non-stop operation has become a trend. At present, more and more bypass non-stop operations of power systems have been extended from overhead lines and related equipment to cable lines. The non-stop maintenance and replacement of network cabinets have been normalized.

At present, there are generally two operation methods for the non-stop maintenance of the ring network cabinet. One is to adjust the load of the line to vacate the load of the ring network cabinet to be repaired or replaced through the switching operation, so that the load carried by it is transferred to other Ring network cabinet, this kind of operation method is suitable for ring network lines or dual power supply lines. It has relatively high requirements for the construction of distribution network grids and cannot meet the operation requirements of distribution network branch lines; one is to use bypass equipment to temporarily Instead of the ring main unit to be repaired or replaced to supply power to users, this operation method is suitable for various lines, and the operation is safe and efficient, and is being vigorously promoted.

Use the bypass equipment to temporarily replace the operation of the distribution network ring network cabinet. If you want to realize the user's complete uninterrupted power supply, the distribution network ring network cabinet must have a spare interval for the access of the bypass cable. The access of the bypass cable is by means of The pre-installed uninterruptible access socket on the spare compartment (most of the distribution network ring network cabinets are not configured) is directly connected to the bypass cable. This method requires that the distribution network ring network cabinet must be installed in advance without interruption. The cost is high; the access of the bypass cable can also be done by cutting off the power of the spare compartment first, and then connecting the bypass cable in the power failure state. This method has no special requirements for the spare compartment and is low in cost. This method is generally used. However, for the ring network cabinet without a spare interval, the follow-up maintenance work of the ring network cabinet must be performed after a power outage and the bypass cable is connected. During the entire operation process, two short-term power failures are required for the connection and connection of the bypass cable. Withdrawal will still affect the reliability of power supply.

For the ring main unit without spare interval, if you want to connect the bypass cable in the charged state, the difficulty mainly lies in:

1) The T-shaped front connectors used for wiring in the ring network cabinet are all running with electricity and load, and are in an insulating and closed state. If the rear protective cover of the T-shaped front connector is removed, the internal conductor and the outer shielding layer of the T-shaped front connector If the distance is less than 30mm, the safety distance is not enough, which will lead to creepage breakdown and ground fault of the line.

2) If the outer layer of the T-shaped front connector for the ring network cabinet is designed to be fully insulated, during the connection process of the bypass cable, the conductor used for the connection is connected to the terminal of the T-shaped front connector. The distance between the network cabinet and the ring network cabinet is less than 80mm, and the operating distance between the conductor and the ring network cabinet is not enough, which will also cause a ground fault.

3) The inner width of the ring network cabinet is generally 305mm, the space is narrow, and there is an insulation protection isolation problem between the cabinet body and the wiring terminals.

Contents of the invention

The object of the present invention is to provide an auxiliary device for connecting cables to ring network cabinets without power failure, which has a simple structure and is easy to operate, and solves the problem of connecting bypass cables without power failure to ring network cabinets without a spare interval.

The technical solution of the present invention is: install a terminal block in the ring network cabinet body, install a T-shaped front joint with an outer sheath made of fully insulating material on the terminal block, install a wiring stud in the T-shaped front joint, and run the No. 1 cable The terminal is connected to the terminal block through the terminal stud and pressed by the No. 1 terminal nut; the characteristic is that the ring network cabinet is equipped with an auxiliary device for uninterrupted power access, and the auxiliary device includes a protective baffle for auxiliary insulation and an auxiliary Two parts of the connected bridge mechanism; the protective baffle plate of the auxiliary insulation includes a top plate and a side plate, and a guide hole is opened on the side plate, and a side plate is respectively installed on both sides of the top plate through the guide column through the guide hole, and the side plate is installed according to the guide hole. The interval width dimension of the ring network cabinet slides to both sides by the guidance of the guide column; the bridge bridge mechanism of the auxiliary connection includes an extension rod, a No. 2 wire nut, a No. 3 wire nut, an insulating plug, a No. Type rear joint, one end of the extension rod has an internal thread hole, the other end of the extension rod is an external thread stud, one end of the extension rod is connected to the terminal stud in the T-shaped front joint through the internal thread hole, and the other end of the extension rod protrudes from the T The rear end of the T-type front connector is outside, the T-type rear connector is connected to the rear end of the T-type front connector, and the No. , The No. 3 wire nut is pressed tightly, and the insulating plug is installed at the rear end of the T-shaped rear joint.

Wherein, the fixed line is installed on the top plate.

Wherein, the extension rod is covered with an insulating sleeve.

Wherein, shielding rings are respectively installed on the T-shaped front connector and the T-shaped rear connector.

The advantages of the present invention are:

1. The insulating sleeve is made of insulating transparent material, the inner diameter is the same as the outer diameter of the extension rod, and the length is longer than that of the extension rod. The extension rod is put into the insulation sleeve and slides, and the extension rod and the terminal stud of the T-shaped front joint are always connected through insulation. The casing is isolated from the outside;

2. The side plate slides to both sides according to the interval width of the ring network cabinet with the help of the guide column. The protective baffle is placed on the top of the ring network cabinet to insulate and isolate the top and both sides of the ring network cabinet to ensure that the T-shaped rear connector is inserted. Insulation distance during the T-shaped front joint process;

3. The shielding ring is made of copper braid, which surrounds the outer surface of the T-shaped front and rear connectors. The shielding ring is connected to the ring network cabinet and grounded to eliminate the accumulation of the outer protective layer of the T-shaped front and rear connectors during later power-on operation. charge;

4. The outer sheath layer of the T-shaped front connector and the T-shaped rear connector is a fully insulating structure to ensure the insulation distance from the external medium.

5. The present invention utilizes the protection of fully insulated T-shaped front joints, T-shaped rear joints, insulating protective baffles and insulating sleeves, and the shielding ring eliminates the accumulated charge of the insulating layer of the T-shaped front and rear joints, and solves the problem of not having a spare interval It is a new method to repair and replace the ring network cabinet without power failure.

Description of drawings

Fig. 1 is a state diagram of bypass cable access in the present invention.

Figure 2 is a schematic diagram of the protective baffle.

Figure 3 is a schematic diagram of the installation of the insulating bushing.

In the figure: 1 wiring seat; 2 ring network cabinet body; 3 protective baffle; 4 shielding ring; 5 T-shaped front connector; 10 No. 2 wire nut; 11 No. 3 wire nut; 12 Insulation plug; 13 No. 2 terminal; 14 T-shaped rear connector; 15 Fixed wire; 301 top plate; 302 side plate;

Detailed ways

As shown in Figure 1-3, install the terminal block 1 in the cabinet body 2 of the ring network cabinet, install the T-shaped front joint 5 with the outer sheath of fully insulating material on the terminal block 1, and install the terminal studs in the T-shaped front joint 5 6. The No. 1 connection terminal 7 of the running cable is connected to the terminal block 1 through the connection stud 6 and compressed by the No. 1 connection nut 8; the feature is: the ring main unit is equipped with an auxiliary device for uninterrupted access, and the above-mentioned The auxiliary device includes two parts: a protective baffle for auxiliary insulation and a bridge bridge mechanism for auxiliary connection; the protective baffle 3 for auxiliary insulation includes a top plate 301 and a side plate 302. There are guide holes on the side plate 302, and the two parts of the top plate 301 One side plate 302 is respectively installed through the guide column 303 through the guide hole, and the side plate 302 slides to both sides according to the interval width dimension of the ring main unit by means of the guide column 303; the bridge bridge mechanism of the auxiliary connection includes an extension rod 9 , No. 2 wire nut 10, No. 3 wire nut 11, insulating plug 12, No. 2 wire terminal 13 and T-shaped rear connector 14, one end of the extension rod 9 has an internally threaded hole, and the other end of the extension rod 9 is an externally threaded stud , one end of the extension rod 9 is connected to the terminal stud 6 in the T-shaped front joint 5 through an internally threaded hole, the other end of the extension rod 9 protrudes outside the rear end of the T-shaped front joint 5, and the T-shaped rear joint 14 is connected to the T-shaped At the rear end of the front joint 5, the No. 2 terminal 13 of the bypass cable is connected to the externally threaded stud at the other end of the extension rod 9, and is pressed tightly by the No. 2 wire nut 10 and the No. 3 wire nut 11, and the insulating plug 12 is installed in the rear end of T-type rear joint 14.

Wherein, the fixed line 15 is installed on the top plate 301 .

Wherein, the extension rod 9 is covered with an insulating sleeve 901 .

Wherein, shielding rings 4 are installed on the T-shaped front connector 5 and the T-shaped rear connector 14 respectively.

A T-shaped front connector 5 with a fully insulating outer sheath has been installed on the terminal block 1 in the running ring network cabinet. The No. 1 terminal 7 of the running cable is connected to the terminal block 1 through the terminal stud 6, and is No. 8 wire nut 8 is compressed, and the rear end of the T-shaped front joint 5 is connected to an insulating plug. At this time, the ring main unit is in a normal operating state.

When connecting to the ring network cabinet without power failure: first open the ring network cabinet, put the protective baffle 3 into the upper part of the ring network cabinet body 2, and slide the side plate 302 to both sides with the help of the guide column 303 to adjust the side plate 302 to make it The width matches the width of the ring network cabinet cabinet body 2; secondly, it is fixed by the fixed wire 15 on the top plate 301; the shielding ring on the T-shaped front joint 5 is removed, and the insulation and isolation work is completed; then the rear end of the T-shaped front joint 5 is opened Cover to expose the terminal stud 6 in the T-shaped front connector. Because the outer sheath of the T-shaped front connector 5 is made of fully insulating material, the insulation protection and distance of the terminal stud 6 are sufficient, and there will be no creepage phenomenon. 9 is put into the insulating sleeve 901, and the extension rod 9 is pushed into the rear end of the T-shaped front connector 5 together with the insulating sleeve 901 to connect with the terminal stud 6; then withdraw from the insulating sleeve 901, and one end of the extension rod 9 protrudes Outside the rear end of the T-shaped front joint 5, since there is a protective baffle 3 on the upper part of the ring network cabinet body 2, and the outer sheath of the surrounding T-shaped front joint is made of fully insulating material, there will be no creepage phenomenon; finally, the T Type rear connector 14 is connected to the rear end of T-type front connector 5, and the No. 2 terminal 13 of the bypass cable is connected to the other end of the extension rod 9, and is compressed by No. 2 wire nut 10 and No. 3 wire nut 11 to realize bypass When the cable is connected to the running ring network cabinet without power off, connect the insulating plug 12 to the rear end of the T-shaped rear connector 14 to realize the full insulation and sealing of the connector, and re-insert the shielding ring 4 into the T-shaped front connector 5 and the outer layer of the T-shaped rear joint 14 are used to eliminate the accumulated charge, withdraw the protective baffle 3, and complete the uninterrupted access of the bypass cable and the ring network cabinet.

Claims (4)

1. The auxiliary device for connecting the cables without power failure of the ring network cabinet, install the terminal block (1) in the ring network cabinet body (2), and install the T-shaped front connector with the outer sheath of fully insulating material on the terminal block (1) (5), T-shaped front connector (5) is installed with terminal studs (6), and the No. 1 terminal (7) of the running cable is connected to the terminal block (1) through the terminal studs (6) and connected through the No. 1 terminal nut (8) Compression; it is characterized in that: the ring network cabinet is equipped with an auxiliary device for uninterrupted power access, and the auxiliary device includes two parts: a protective baffle for auxiliary insulation and a bridge bridge mechanism for auxiliary connection; the auxiliary insulation The protective baffle (3) includes a top plate (301) and a side plate (302). The side plate (302) has a guide hole, and the two sides of the top plate (301) are installed with a side plate (303) through the guide hole. The board (302), the side board (302) slides to both sides according to the interval width of the ring network cabinet with the help of the guide column (303); Nut (10), No. 3 wire nut (11), insulating plug (12), No. 2 wire terminal (13) and T-shaped rear joint (14), the end of the extension rod (9) has an internal thread hole, and the extension rod (9) The other end is an externally threaded stud, and one end of the extension rod (9) is connected to the terminal stud (6) in the T-shaped front joint (5) through an internal thread hole, and the other end of the extension rod (9) protrudes from the T outside of the rear end of the T-shaped front connector (5), the T-shaped rear connector (14) is connected to the rear end of the T-shaped front connector (5), and the No. 2 terminal (13) of the bypass cable is connected to the extension rod (9) On the externally threaded stud at the other end, and compress by No. 2 wire nuts (10) and No. 3 wire nuts (11), the insulating plug (12) is installed on the rear end of the T-shaped rear joint (14). 2. The auxiliary device for connecting cables to the ring main unit without power failure according to claim 1, characterized in that: a fixed line (15) is installed on the top plate (301). 3. The auxiliary device for connecting cables to the ring main unit without power failure according to claim 1, characterized in that: the extension rod (9) is covered with an insulating sleeve (901). 4. The auxiliary device for connecting cables to the ring main unit without power failure according to claim 1, characterized in that: shielding rings (4) are respectively installed on the T-shaped front joint (5) and the T-shaped rear joint (14).