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A multifunctional grounding device for high voltage cables

A technology of grounding device and high-voltage cable, which is applied in the direction of cable installation device, cable installation, electrical components, etc., can solve the problems of poor sealing of cable grounding box, increase of staff, increase of workload and loss of manpower and material resources, etc., to achieve Ensure safe operation and simple operation

Active Publication Date: 2017-01-18
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cable grounding boxes are mostly used in 35kV and above cable grounding systems. Due to the poor sealing of the cable grounding boxes and the lack of strict control in the construction process, the faults of some cable grounding boxes have occurred frequently recently, resulting in forced power outages for maintenance of the power grid.
Every power outage for maintenance will cause a single-line power outage in the power grid, which will cause great economic losses to users and cause transmission pressure to adjacent power grids
At the same time, there are more staff to cooperate with the power outage, including operating personnel switching operations, maintenance personnel eliminating shortages, dispatching personnel ordering, line personnel maintaining power, etc., which increases the workload and the loss of manpower and material resources.

Method used

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  • A multifunctional grounding device for high voltage cables
  • A multifunctional grounding device for high voltage cables
  • A multifunctional grounding device for high voltage cables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one: if figure 2 As shown, the first embodiment of the present embodiment is aimed at the situation of overhauling and monitoring a group of protective grounding boxes for high-voltage cables in the working mode of one end protected and one end directly grounded, and the first to second monitorable load statuses are required for on-site maintenance. High voltage cable multifunctional grounding device N1-N2.

[0021] (1) If there is a defect in the first cable protection grounding box BHJD1, live maintenance is required, before the maintenance of the first cable protection grounding box BHJD1, switch the air switch K1~ K3, K7~K9 are all disconnected, and then the N1 grounding wire is connected to the earth, at this time, N1 is in protection mode.

[0022] After opening the cover of the first cable protective grounding box BHJD1, connect the terminal P1 of the first high-voltage cable multifunctional grounding device N1 capable of monitoring the load state to...

Embodiment 2

[0029] Embodiment two: if image 3 As shown, the second embodiment is for the high-voltage cables under the working mode of one end protected and one end directly grounded, and two groups of protective grounding boxes are inspected and monitored. During on-site maintenance, the third to fifth monitorable load states are required. High voltage cable multifunctional grounding device N3-N5.

[0030](1) If there is a defect in the second to third cable protection grounding boxes BHJD2-BHJD3, live maintenance is required, before the maintenance of the second to third cable protection grounding boxes BHJD2-BHJD3, put the third high-voltage cable that can monitor the load status The air switches K1 ~ K9 of the multifunctional grounding device N3 are all disconnected, and then the grounding wire of N3 is connected to the earth, and N3 is in protection mode at this time.

[0031] After opening the cover of the second cable protective grounding box BHJD2, connect the terminal P1 of the...

Embodiment 3

[0041] Embodiment three: as Figure 4 As shown, the third embodiment is aimed at the high-voltage cables in the cable cross-interconnection protection mode.

[0042] A-1 of the cross interconnection grounding box is connected to the metal sheath lead-out line at the left end of the A-phase cable insulation joint, A-2 of the cross-interconnection grounding box is connected to the metal sheath lead-out line at the right end of the A-phase cable insulation joint; the cross-interconnection grounding box B-1 of the cross-connection grounding box is connected to the metal sheath lead-out line at the left end of the B-phase cable insulation joint, B-2 of the cross-connection grounding box is connected to the metal sheath lead-out line of the right end of the B-phase cable insulation joint; Connect to the lead-out line of the metal sheath at the left end of the C-phase cable insulation joint, and connect C-2 of the cross-connection grounding box to the metal-sheath lead-out line at th...

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Abstract

The invention discloses a high-voltage cable multifunctional grounding device, which comprises a first protection circuit U1, a second protection circuit U2, switches K7 to K9, and wiring terminals P1 to P6. Different forms of grounding modes are integrated, a protector and a grounding system is arranged inside the device, and according to maintenance demands, safe transfer (one box for multiple functions) can be carried out among a direct grounding mode, a cross interconnection mode and a protection mode through a switch transfer instrument; the original cable grounding box can be replaced or maintained in the case of live cable, the device can serve as a temporary grounding system, a defected grounding box can be isolated through connection with a cable grounding line, safe operation of a maintenance person can be ensured, and a new breakthrough of lively maintaining the cable grounding system can be realized; and the device can be not only controlled in a phase separation mode but also controlled in an integration mode, the operation is simple and convenient, and moving and carrying are convenient.

Description

technical field [0001] The invention belongs to the technical field of cable grounding system maintenance and relates to a multifunctional grounding device for high-voltage cables. Background technique [0002] The main components of the high-voltage cable grounding system are the cable direct grounding box, the cable protection box, and the cable cross-connection box. The main function of the high-voltage cable protective grounding system is to reduce the induced voltage accumulated in the metal protective layer of the running cable, and to eliminate excess induced current through the grounding system. At present, single-core high-voltage cables mostly adopt single-point grounding mode, one-end grounding and one-end protection mode, and cross-connection mode. If there is a grounding system fault, the grounding system should be overhauled after the cable is powered off. [0003] Cable grounding boxes are mostly used in 35kV and above cable grounding systems. Due to the poo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G1/00
Inventor 李宏峰杨博超王立军成洪刚胡建彬张霞郭康
Owner STATE GRID CORP OF CHINA
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