CN103166138B - The method of switching cabinet is changed based on the case segmentation transformation of bypass cable branch - Google Patents

Abstract

The present invention relates to the transformation of a kind of switching cabinet and replacing options, particularly a kind of method changing switching cabinet based on the case segmentation transformation of bypass cable branch. The present invention by means of bypass cable branch case, enable the corresponding power line of switching cabinet and put for electric line temporarily, and obtain the power-on time at interval, substantially reduce the power off time of user, owing to have employed segmentation transformation, make transformation more orderly and simple, it is possible to effectively to shorten the transformation duration, and have a power failure in short-term several times, customer power supply is not affected when transforming basis and more renew bus looped network cabinet, facilitate user, there is good practicality, also substantially increase power supply reliability.

Description

The method of segmental reconstruction and replacement of switchgear based on bypass cable branch box

technical field

The invention relates to a modification and replacement method of a switch cabinet, in particular to a method for segment modification and replacement of a switch cabinet based on a bypass cable branch box.

Background technique

With the development of the economy, the 10kV switch stations, switch stations, and distribution stations built in the early stage have been put into operation for a long time, and the operating equipment such as switch cabinets are old and aging, which cannot meet the increasing demand of the load, and the failure rate is high. There are many complaints from users and it is in urgent need of renovation. When the overall transformation of the switch station is carried out, power outage operation is required. Due to the long construction period of the transformation, the power outage time is long, which not only brings great inconvenience to users, but also affects the reliability of power supply.

Contents of the invention

The purpose of the present invention is to provide a sub-section based on bypass cable branch box to realize non-stop or short-term power outage transformation switch station according to the deficiencies of the prior art, shorten the user power outage time, shorten the transformation period, and improve power supply reliability The method of transforming and replacing the switchgear.

The purpose of the present invention is achieved by the following approach:

The key point of the method for segmentally transforming and replacing the switchgear based on the bypass cable branch box is to include the following steps in sequence:

1. A bypass cable branch box is provided, including a box body and a channel steel located below the box body, and a three-phase busbar copper bar and a plurality of cable connection terminals located on the three-phase busbar copper bar are installed in the box body;

2. Install the above-mentioned bypass cable branch box in the site of the switchgear to be replaced, the switchgear to be replaced includes a section I bus switchgear and a section II bus switchgear;

3. In the first stage of short-term power failure, the incoming power cables of the I-section bus switch cabinet and the outgoing cables to the single power supply users are respectively connected to different cable connection terminals in the bypass cable branch box through the channel steel under the box body , the outgoing cable from the I-section busbar switch cabinet to the dual power supply users is powered off, and the dual power supply users provide incoming power supply separately;

4. Remove the I-section busbar switchgear, modify the foundation of the cabinet, and install a new I-section busbar ring network cabinet;

5. In the second stage of short-term power failure, all the incoming and outgoing cables of the I-section bus switch cabinet shall be lapped and installed according to the electrical wiring diagram of the I-section bus ring network cabinet;

6. Repeat steps 3-5 to replace the busbar switchgear of section II. After the transformation and replacement, remove the bypass cable branch box.

In this way, the present invention uses the bypass cable branch box to temporarily place the corresponding power lines and power supply lines of the switchgear, and obtain interval power supply time, which greatly shortens the user's power outage time. It makes the transformation more orderly and simple, can effectively shorten the transformation period, and divides into multiple short-term power outages, and does not affect the user's power supply when transforming the foundation and replacing the new bus ring network cabinet, which is convenient for users and has good practicability. It also greatly improves the reliability of power supply.

Description of drawings

Fig. 1 shows the structural representation of bypass cable branch box of the present invention;

The present invention will be further described below in conjunction with the examples.

specific embodiment

Best practice:

Taking the I-section busbar switchgear as an example, the method of segmentally transforming and replacing the switchgear based on the bypass cable branch box includes the following sequential steps:

1. On-site investigation whether there is enough space for the bypass cable branch box in the 10kV switch station to be transformed.

2. On-site investigation of 10kV incoming and outgoing cables to see if there is enough margin to draw back the cables and connect them to the bypass cable branch box.

3. Provide a bypass cable branch box, including a box body 1 and a channel steel 2 located below the box body. A three-phase bus bar copper bar 3 and a plurality of cable connections on the three-phase bus bar copper bar are installed in the box body 1. The height of terminal 4 and channel steel 2 must ensure the bending radius of the cable.

4. Install the above-mentioned bypass cable branch box in the site of the I-section busbar switchgear, and start the first phase of short-term power failure, and separate the incoming power cables of the I-section busbar switchgear and the outgoing cables to the single power supply users Connect to different cable connection terminals in the bypass cable branch box through the channel steel at the bottom of the box, and confirm that the phase sequence of the bypass system is consistent with that of the original system. The power user shall provide the incoming power supply separately.

5. Transfer the line on the opposite side of the incoming power supply from operation to inspection and maintenance, supply power to the branch box of the bypass cable, and transfer the line on the opposite side of the feeder from operation to inspection and maintenance, put the bypass system into operation, and restore the power consumption of the opposite side users.

6. Remove the I-section busbar switchgear, modify the foundation of the cabinet, and install a new I-section busbar ring network cabinet.

7. In the second stage of short-term power failure, all the incoming and outgoing cables of the I-section bus switch cabinet shall be lapped and installed according to the electrical wiring diagram of the I-section bus ring network cabinet.

The parts not described in the present invention are the same as the prior art.

Claims (1)

1. The method for segmentally transforming and replacing the switchgear based on the bypass cable branch box includes the following steps in sequence: (1) Provide a bypass cable branch box, including a box body and a channel steel located below the box body, and a three-phase bus bar copper bar and a plurality of cable connection terminals on the three-phase bus bar copper bar are installed in the box body; (2) Install the above-mentioned bypass cable branch box in the site where the switchgear to be replaced includes the I-section busbar switchgear and the II-section busbar switchgear; (3) In the first stage of short-term power failure, the incoming power cables of the I-section busbar switch cabinet and the outgoing cables to the single power supply users are respectively connected to different cable connection terminals in the bypass cable branch box through the channel steel under the box body In the above, the outgoing cables from the I-section busbar switch cabinet to the dual power supply users are powered off, and the dual power supply users provide incoming power supply separately; (4) Remove the I-section busbar switchgear, transform the foundation of the I-section busbar switchgear, and install a new I-section busbar ring network cabinet; (5) In the second stage of short-term power failure, all the incoming and outgoing cables of the I-section bus switch cabinet shall be lapped and installed according to the electrical wiring diagram of the I-section bus ring network cabinet; (6) Repeat steps (3)-(5) to replace the busbar switchgear of section II. After the transformation and replacement, remove the bypass cable branch box.