High-voltage cable protection grounding system transfer device
A technology of protective grounding and switching devices, which is applied in the direction of cable installation devices, cable installation, electrical components, etc., can solve the problems of poor sealing of cable grounding boxes, increased staff, and economic losses of users, so as to ensure safe operation, Small size, easy to carry effect
Active Publication Date: 2014-10-22
STATE GRID CORP OF CHINA +1
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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.
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[0017] Depend on figure 1 It can be known from the illustrated embodiment that it includes a first adapter U1 and a second adapter U2;
[0018] The first adapter U1 includes protectors R1-1~R1-3, ammeters A1-1~A1-3, voltmeters V1-1~V1-3 and air switches K1-1~K1-3; The second adapter U2 includes protectors R2-1~R2-3, ammeters A2-1~A2-3, voltmeters V2-1~V2-3 and air switches K2-1~K2-3;
[0019] The protector R1-1 is connected in series with the ammeter A1-1 and connected between the A-phase metal sheath on the side of the cable protection grounding box and the ground; the voltmeter V1-1 is the same as the protector R1-1 and the ammeter A1 The series circuit of -1 is connected in parallel; the air switch K1-1 is connected in parallel with the protector R1-1;
[0020] The protector R1-2 is connected in series with the ammeter A1-2 and connected between the B-phase metal sheath on the side of the cable protection grounding box and the ground; the voltmeter V1-2 is the same as the...
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The invention discloses a high-voltage cable protection grounding system transfer device, which comprises a first transfer unit U1 and a second transfer unit U2. The device has the beneficial effects that the device is internally provided with a protector and a grounding structure, according to maintenance demands, safe transfer (one box for multiple purposes) can be carried out between a protection mode and a direct grounding mode via air switches; the original cable grounding box can be replaced or maintained in the case of live cable, the device can serve as a temporary grounding device, 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; as the device is internally integrated with current meters and voltage meters, live cable detection can be carried out after connection with the cable grounding wire, and the current load state can be intuitively analyzed through display of data of the current meters and the voltage meters in the case of maintenance; and the size is small, and carrying is convenient.
Description
technical field [0001] The invention belongs to the technical field of cable grounding system maintenance and relates to a high-voltage cable protective grounding system switching device. Background technique [0002] 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 poor sealing of the cable grounding boxes and the lack of strict control of the construction process, the faults of some cable grounding boxes have occurred f...
Claims
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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