WO2015143885A1

WO2015143885A1 - Power cable intelligent grounding box

Info

Publication number: WO2015143885A1
Application number: PCT/CN2014/092265
Authority: WO
Inventors: 朱辉; 杜健; 许箴; 刘倩茜; 汪浩
Original assignee: 江苏省电力公司常州供电公司; 江苏省电力公司; 国家电网公司
Priority date: 2014-03-28
Filing date: 2014-11-26
Publication date: 2015-10-01

Abstract

A power cable intelligent grounding box comprises: a cable sheath crossed interconnection protection grounding box; a signal collection terminal (2) mounted in the grounding box; a current transformer (3, 4, 5) on each of a phase line A, a phase line B, and a phase line C; an antenna (6); and an energy-obtaining current transformer (7) for power supply. The signal collection terminal (2) comprises an over-current protection module (21), a current sampling module (22), a temperature sensor (23), a humidity sensor (24), a signal processing module (25), a GPRS module (26) and a power module (27). The signal collection terminal (2) receives and processes current sampling information processed by three current transformers (3, 4, 5) by means of the over-current protection module (21) and the current sampling module (22), and temperature and humidity information transmitted by the temperature sensor (23) and the humidity sensor (24), and sends related information to a background monitoring system of the power supply department wirelessly. The power cable intelligent grounding box is convenient to implement, low in cost and easy to popularize. In use, the power cable intelligent grounding box can effectively improve validity and accuracy of cable online monitoring and ensure the safety of a power supply grid.

Description

Power cable intelligent grounding box

Technical field

The invention relates to the field of power cable operation safety monitoring, and particularly relates to a power cable intelligent grounding box.

Background technique

With the continuous improvement of the level of urban modernization, power cables are an important equipment in urban power grids, and the development speed is extremely fast, and urban power cables usually adopt the layout method of entering the earth. One of the causes of the failure of the urban cable in actual operation is the failure of the grounding system of the power cable, which accounts for 21% of the cable failure. The outer sheath of the power cable is easily damaged by external force, chemical corrosion, lightning overvoltage during use. Or the system overvoltage, etc., causing the insulation of the sheath to cause one or more grounding, thereby destroying the grounding system of the metal sheath of the high-voltage cable, causing the imbalance of the induced electromotive force of the metal sheath of the cable, resulting in a large metal sheath and the earth. The circulation, the additional line loss increases, and the cable temperature increases; in the long run, the main insulation will be jeopardized, the normal operating life of the cable line will be shortened, and the safe operation of the line will be affected.

In order to prevent the above phenomenon, the cable grounding box is usually used for protection. Common cable grounding boxes mainly include cable sheathing direct grounding box, cable sheathing protection grounding box and cable cross-connection protection grounding box. The inside of the cable sheathing direct grounding box contains copper bars, copper terminals, etc., which are used for direct grounding of the cable sheath. There is no need to install a cable sheath protector inside. Cable sheath protection grounding box and cable sheath cross-connection protection The grounding box contains cable sheath protector, connecting copper bars, copper terminals, etc., for the protective grounding of the cable sheath. At present, the cable grounding box, which hopes to change the shortcomings of the traditional grounding box to meet the needs of real-life monitoring, has been seen. For example, the Chinese patent document entitled "High-voltage cable intelligent grounding box" published by CN 102590670A, discloses a The grounding box of the monitoring function must be monitored, but its structure is not specific enough; the current power cable grounding box is generally not able to effectively adapt to the online monitoring needs of the power cable in various environments.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a simple structure, low cost, convenient implementation, easy to popularize, and can effectively monitor the grounding state of the cable at the monitoring point when used, and can upload in time when an abnormality occurs. Abnormal information, which can effectively improve the effectiveness and reliability of power cable online monitoring, and secure the power cable intelligent grounding box.

The technical solution of the present invention is: the intelligent grounding box of the power cable of the present invention comprises a cable sheath cross-interconnection protection grounding box, and the above-mentioned cable sheathing cross-connection protection grounding box has a sealed box body, and three crosses are arranged in the box body. The bridged copper row is set; its structural features are: also includes signal acquisition terminal, A-phase current transformer, B-phase current transformer, C-phase current transformer, antenna and current-carrying current transformer; Phase A current transformer, B The phase current transformer and the C-phase current transformer are respectively disposed on each of the three bridged copper bars of the cable sheath cross-connection protection grounding box;

The signal collecting terminal is fixedly disposed in the cable sheath cross-connection protection grounding box; the signal collecting terminal comprises an overcurrent protection module, a current sampling module, a temperature sensor, a humidity sensor, a signal processing module, a GPRS module and a power module;

The overcurrent protection module of the signal collection terminal is provided with a first sampling current signal input end, a second sampling current signal input end, a third sampling current signal input end and a signal output end; the current sampling mode is provided with a signal input end and a signal output end. The temperature sensor and the humidity sensor respectively have a signal output end; the signal processing module is provided with a current sampling signal input end, a temperature signal input end, a temperature signal input end and a signal output end; the GPRS module is provided with a signal input end and a signal output end;

The first sampling current signal input end, the second sampling current signal input end and the third sampling current signal input end of the overcurrent protection module respectively correspond to the A phase current transformer, the B phase current transformer and the C phase current transformer respectively Signal electrical connection; the signal input end of the current sampling module is electrically connected with the signal output end signal of the overcurrent protection module; the current sampling signal input end of the signal processing module is electrically connected with the signal output end signal of the current sampling module; the temperature of the signal processing module The signal input end is electrically connected with the signal output end signal of the temperature sensor; the humidity signal input end of the signal processing module is electrically connected with the signal output end signal of the humidity sensor; the signal input end of the GPRS module is electrically connected with the signal output end signal of the signal processing module. The signal output end of the GPRS module is electrically connected with the antenna signal; the power module is electrically connected with the energy-carrying current transformer; the power module provides working power for other modules.

A further solution is: the above-mentioned cable sheath cross-connection protection grounding box box is a square box body, the box body includes an upper cover; the upper cover is provided with a through-hole through-hole; the lower end of the antenna and the current The output wires of the transformer are cross-connected through the cable sheath to protect the grounding box of the grounding box from the line through the hole and then sealed.

A further solution is as follows: The above-mentioned A-phase current transformer, B-phase current transformer and C-phase current transformer are LMZK1-10, 600/5, 0.5-level current transformers.

A further solution is as follows: the above-mentioned energy-carrying current transformer is arranged on the busbar of the transmission line outside the box of the cable sheath cross-connection protection grounding box; the current-carrying current transformer is LXK-φ180, 800/1, 10W type Current Transformer.

DRAWINGS

1 is a schematic structural view of the present invention, in which the front cover of the box body of the cable sheathing cross-connection protection grounding box is omitted;

2 is a block diagram of the circuit structure of the signal acquisition terminal of FIG. 1, and the electrical connection relationship between the three-phase current transformer, the antenna and the current-carrying current transformer of FIG. 1 is also shown;

FIG. 3 is a schematic structural diagram of a system according to an application of the present invention.

The reference numerals in the above figures are as follows:

Cable sheath cross-connection protection grounding box 1, bridging copper row 11,

Signal acquisition terminal 2, overcurrent protection module 21, current sampling module 22, temperature sensor 23, humidity sensor 24, signal processing module 25, GPRS module 26, power module 27,

Phase A current transformer 3,

B-phase current transformer 4,

C-phase current transformer 5,

Antenna 6,

The current transformer 7 is taken.

detailed description

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

(Example 1)

Referring to FIG. 1 and FIG. 2, the intelligent grounding box of the power cable of the present embodiment is mainly composed of a cable sheath cross-interconnection protection grounding box 1, a signal collecting terminal 2, an A-phase current transformer 3, a B-phase current transformer 4, and a C phase. The current transformer 5, the antenna 6 and the current-carrying current transformer 7 are composed.

The cable sheath cross-connection protection grounding box 1 is a prior art grounding box and will not be described here. The cable sheath cross-connection protection grounding box 1 has a square sealed box body, the box body includes an upper cover, and the upper cover is provided with a through-hole through-hole; the box body is provided with three bridged copper bars 11 arranged at an intersection.

The signal collecting terminal 2 is fixedly disposed at the upper left portion of the cable sheath cross-connect protection grounding box 1. The signal collecting terminal 2 is mainly composed of an overcurrent protection module 21, a current sampling module 22, a temperature sensor 23, a humidity sensor 24, a signal processing module 25, a GPRS module 26, and a power module 27. The signal processing module 25 is mainly composed of an MCU of the MSP430 model.

The overcurrent protection module 21 of the signal collecting terminal 2 is provided with a first sampling current signal input end, a second sampling current signal input end, a third sampling current signal input end and a signal output end; the current sampling mode 22 is provided with a signal input end and The signal output end; the temperature sensor 23 and the humidity sensor 24 are respectively provided with signal output ends; the signal processing module 25 is provided with a current sampling signal input end, a temperature signal input end, a temperature signal input end and a signal output end; the GPRS module 26 is provided with a signal. Input and signal output.

The first sampling current signal input end, the second sampling current signal input end and the third sampling current signal input end of the overcurrent protection module 21 are respectively connected with the A phase current transformer 3, the B phase current transformer 4 and the C phase current transformer 5 corresponding to the signal electrical connection; the signal input end of the current sampling module 22 is electrically connected to the signal output end signal of the overcurrent protection module 21; the current sampling signal input end of the signal processing module 25 is electrically connected to the signal output end of the current sampling module 22 The temperature signal input end of the signal processing module 25 is electrically connected to the signal output end signal of the temperature sensor 23; the humidity signal input end of the signal processing module 25 is electrically connected to the signal output end signal of the humidity sensor 24; GPRS The signal input end of the module 26 is electrically connected to the signal output end signal of the signal processing module 25; the signal output end of the GPRS module 26 is electrically connected to the antenna 6 signal; and the power supply module 27 provides operating power for the other modules. The power module 27 is electrically connected to the energy-carrying current transformer 7, and the power module 27 converts the power provided by the current-carrying current transformer 7 into a stable DC voltage output.

The A-phase current transformer 3, the B-phase current transformer 4, and the C-phase current transformer 5 are respectively disposed one on each of the three bridged copper bars 11 of the cable sheath cross-connection protection grounding box 1. In this embodiment, the A-phase current transformer 3, the B-phase current transformer 4, and the C-phase current transformer 5 are preferably LMZK1-10, 600/5, 0.5-type current transformers.

The antenna 6 is disposed on one side of the upper cover of the casing of the cable sheath cross-connection protection grounding box 1.

The current-carrying current transformer 7 is preferably a LXK-φ180, 800/1, 10W type current transformer in this embodiment. The current-carrying current transformer 7 is disposed on the busbar of the transmission line outside the box of the cable sheath cross-connection protection grounding box 1; the output wire of the current-carrying current transformer 7 and the lower end of the antenna 6 are cross-connected through the cable sheathing protection The line on the upper cover of the box of the grounding box 1 is introduced into the box through the hole, and the circuit is sealed through the hole.

Referring to FIG. 3, the working principle and working process of the power cable intelligent grounding box of the present embodiment are as follows:

In the power cable intelligent grounding box of the embodiment, during the operation, the energy-carrying current transformer 7 takes power from the cable bus, and the power module 27 of the signal collecting terminal 2 supplies the working power. The advantage of this type of power supply compared to the power supply mode of the battery is that the power supply is convenient, and the management trouble of replacing the battery is eliminated. During operation, the A-phase current transformer 3, the B-phase current transformer 4 and the C-phase current transformer 5 collect the current signal of the ABC three-phase grounding bus in real time, and the overcurrent protection module 21 of the signal collecting terminal 2 prevents overcurrent processing. After being sampled by the current sampling module 22, the signal is sent to the signal processing module 25 for processing; the temperature sensor 23 and the humidity sensor 24 respectively collect the real-time temperature and humidity information in the box and transmit it to the signal processing module 25 for processing; the single-chip microcomputer of the signal processing module 25 follows The setting program analyzes and processes the received signal, and wirelessly transmits the processed information to the power supply department background monitoring system via the GPS module 26 and the antenna 6 according to the set frequency. When a certain intelligent grounding box of the power cable of the present embodiment finds that the running state of the monitoring point is abrupt, the information frequency of the monitoring system sent to the power supply department is significantly increased (generally about 5 times of the normal state), and the power supply department backstage After the monitoring system staff finds the abnormal information of the monitoring point, it is convenient to make corresponding processing immediately.

In summary, the power cable intelligent grounding box of the present embodiment is convenient to implement, has low cost, and is easy to promote by adding a signal collecting terminal, an antenna, and an energy-carrying current transformer in the existing cable sheath cross-connection protection grounding box. When used, it can monitor the current information of the grounding busbar of the monitoring point and the temperature and humidity information of the box in real time. When the running state of the monitoring point is abrupt, it significantly increases the frequency of information sent to the background monitoring system of the power supply department. After the staff of the background monitoring system of the power supply department finds the abnormal information of the monitoring point, it can conveniently and quickly make corresponding and timely processing, thereby effectively improving the effectiveness and accuracy of the online monitoring of the cable and ensuring the safety of the power supply network.

The above embodiments are illustrative of the specific embodiments of the present invention, and are not intended to limit the scope of the invention, and various modifications and changes can be made without departing from the spirit and scope of the invention. Corresponding equivalent technical solutions, therefore, all equivalent technical solutions should be included in the scope of patent protection of the present invention.

Industrial applicability

The invention has positive effects: (1) The power cable intelligent grounding box of the invention realizes convenience by adding a signal collecting terminal, adding an antenna and absorbing a current transformer in the existing cable sheath cross-connection protection grounding box, Low cost and easy to promote.

(2) The intelligent grounding box of the power cable of the invention can monitor the current information of the grounding busbar of the monitoring point and the temperature and humidity information of the box in real time when used, and when the operating state of the monitoring point is abrupt, it increases significantly. The information frequency sent to the background monitoring system of the power supply department, after the staff of the power supply department background monitoring system finds the abnormal information of the monitoring point, it can conveniently and quickly make corresponding and timely processing, thereby effectively improving the effectiveness and accuracy of online cable monitoring. To ensure the safety of the power supply grid.

Claims

An intelligent grounding box for a power cable, comprising a cable sheath cross-connection protection grounding box (1), the cable sheath cross-connecting protection grounding box (1) has a sealed box body, and three cross-settings are arranged in the box body Bridged copper busbar (11); characterized in that it further comprises a signal acquisition terminal (2), an A-phase current transformer (3), a B-phase current transformer (4), a C-phase current transformer (5), and an antenna ( 6) and the current-carrying current transformer (7); the A-phase current transformer (3), the B-phase current transformer (4) and the C-phase current transformer (5) in the cable sheath cross-connection protection grounding box (1) One of each of the three cross-connected copper bars (11) is provided;

The signal collecting terminal (2) is fixedly disposed in the cable sheath cross-connection protection grounding box (1); the signal collecting terminal (2) includes an overcurrent protection module (21), a current sampling module (22), and a temperature sensor ( 23), humidity sensor (24), signal processing module (25), GPRS module (26) and power module (27);

The overcurrent protection module (21) of the signal acquisition terminal (2) is provided with a first sampling current signal input end, a second sampling current signal input end, a third sampling current signal input end and a signal output end; and a current sampling module (22) The signal input end and the signal output end are provided; the temperature sensor (23) and the humidity sensor (24) respectively have signal output ends; the signal processing module (25) is provided with a current sampling signal input end, a temperature signal input end, and a temperature signal input. Terminal and signal output; GPRS module (26) is provided with a signal input end and a signal output end;

The first sampling current signal input end, the second sampling current signal input end and the third sampling current signal input end of the overcurrent protection module (21) are respectively connected with the A phase current transformer (3) and the B phase current transformer (4) Corresponding to the signal electrical connection of the C-phase current transformer (5); the signal input end of the current sampling module (22) is electrically connected to the signal output end signal of the overcurrent protection module (21); the signal processing module (25) The current sampling signal input end is electrically connected to the signal output end signal of the current sampling module (22); the temperature signal input end of the signal processing module (25) is electrically connected to the signal output end signal of the temperature sensor (23); the signal processing module (25) The humidity signal input end is electrically connected to the signal output end signal of the humidity sensor (24); the signal input end of the GPRS module (26) is electrically connected to the signal output end signal of the signal processing module (25); the GPRS module (26) The signal output terminal is electrically connected to the antenna (6) signal; the power module (27) is electrically connected to the energy-carrying current transformer (7); and the power module (27) provides working power for the other modules.
The power cable intelligent grounding box according to claim 1, wherein the cable sheathing cross-protection grounding box (1) has a square box body, the box body comprises an upper cover, and the upper cover is provided with the upper cover. The upper and lower through-line passes through the hole; the lower end of the antenna (6) and the output wire of the current-carrying current transformer (7) pass through the cable sheath to cross-connect the line on the upper cover of the protective grounding box (1) Sealed behind the hole.
The power cable intelligent grounding box according to claim 1, wherein said A phase electricity The flow transformer (3), the B-phase current transformer (4) and the C-phase current transformer (5) are LMZK1-10, 600/5, 0.5-level current transformers.
The power cable intelligent grounding box according to claim 1, wherein the energy-carrying current transformer (7) is disposed on a busbar of a transmission line outside the box of the cable sheath cross-connection protection grounding box (1). The current-carrying current transformer (7) is a LXK-φ180, 800/1, 10W type current transformer.