CN214067311U

CN214067311U - Voltage sag fault positioning device for cable branch line

Info

Publication number: CN214067311U
Application number: CN202023176355.6U
Authority: CN
Inventors: 谭光慧; 孟超
Original assignee: Jiangsu Nandian Smart Energy Service Co ltd
Current assignee: Jiangsu Nandian Smart Energy Service Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-08-27
Anticipated expiration: 2030-12-25

Abstract

The utility model provides a cable branch circuit's voltage sag fault locating device has increased second grade box and division board in the upper end of original control box to inside being provided with of second grade box: the system comprises a voltage sag device, a load switch controller and a line fault positioning equipment communication terminal; the inlet insulator fixing plate and the station load switch are arranged at the upper end of the control box body and are fixedly connected with the isolation plate; the control box lower extreme is around intercommunication, and control box lower extreme is provided with: the high-voltage power consumption monitoring device comprises a grounding and short-circuit fault indicator, a high-voltage power consumption monitoring meter and an inlet wire insulator fixing plate, wherein an antenna is arranged at the top of a control box body. The utility model discloses can realize the judgement and the locate function to the voltage sag condition of each branch circuit.

Description

Voltage sag fault positioning device for cable branch line

Technical Field

The utility model relates to a voltage sag detects technical field.

Background

With the rapid development of the modern power industry and the great change of the electrical load structure in the system, more and more accidents are caused by the transient power quality problem, the voltage sag problem is more and more obvious, the voltage sag causes the shutdown of a motor on a production line, a frequency converter loses the protection action, a programmable logic controller is disabled, more and more data stored in a computer are lost, and great economic loss is brought to users. In the operation process of a power grid, when accidents such as lightning stroke and external force damage occur, the voltage of the power grid can be caused to temporarily drop, even reclosing action is caused, the voltage temporarily drop can cause a unit in operation of a user to quit operation due to the fact that a relay is powered off, impact is caused to equipment in operation, meanwhile, due to the fact that the large-capacity multi-process unit is long in restarting time, the production process is delayed, and a large amount of unnecessary loss is brought to enterprises. After the accident trip, it is very important to judge, locate and diagnose the voltage sag in time.

At present, the urban distribution network is increasingly supplied with power by using cables, and sometimes, the situation that independent load distribution with low capacity is relatively concentrated occurs, at this time, a cable branch box is generally used for connecting cables in a multi-branch mode, because the cable branch box cannot directly operate each path, but only plays a role in cable branch. The cable branch box has the main function of two points, namely, the cable is switched and the cable is tapped.

1) And (4) cable tapping. The cable is usually used and wasted due to the fact that a plurality of small-area cables are arranged on a line with a long distance, then a main large cable is usually used for outgoing in the process of outgoing to an electric load, then the main cable is divided into a plurality of small-area cables by the cable branch box when the load is close to, and the small-area cables are connected into the load. The wiring mode is widely applied to power supply of street lamps and the like and power supply of small users in an urban power grid.

2) And (4) cable switching. On a relatively long line, the length of the cable cannot meet the requirements of the line, a cable connector or a cable junction box must be used, a cable intermediate connector is usually adopted in a short distance, but when the line is relatively long, the cable is on a cable line of more than 1000m according to experience, and if a plurality of intermediate connectors are arranged in the middle of the cable, the cable junction box is considered for switching in order to ensure safety.

The cable branch box realizes convenient butt joint of cables with different sections, abandons the complex process of a cable intermediate joint, improves the cable connection environment, is favorable for ensuring the butt joint quality and is convenient for the conventional inspection and maintenance of subsequent operation. However, some cable branch boxes currently only can realize the positioning and judgment of the line loss condition, but cannot realize the area positioning and judgment of the voltage sag condition of the line; meanwhile, the internal environment of the original box body can be interfered by high voltage, so that the judgment of the voltage sag condition is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: in order to solve the problem existing in the above-mentioned background art, the utility model provides a cable branch circuit's voltage sag fault locating device.

The technical scheme of the utility model: the utility model provides a cable branch circuit's voltage sag fault locating device, include: the system comprises an insulator fixing plate, a station load switch, a wire inlet insulator fixing plate, a load switch controller, a line fault positioning equipment communication terminal, a high-voltage electricity utilization monitoring meter, a grounding and short-circuit fault indicator, communication equipment, a control box, a voltage sag device and a diode box body;

the control box is internally provided with a plurality of guide rails which are horizontally arranged and have different heights, a partition plate with the same length as the top is fixedly arranged at the midpoint of the top in the control box, a gap is reserved between the partition plate and the bottom in the control box, the space where the partition plate in the control box is located is used as the upper space of the inner space of the control box, and the space below the partition plate is used as the lower space of the inner space of the control box; the isolating plate divides the upper space of the control box into a front space and a rear space, the diode box body is square, is arranged in the front space of the control box and is fixedly connected with the top of the inside of the control box, a plurality of horizontally arranged guide rails are arranged in the diode box body, and the load switch controller, the line fault positioning equipment communication terminal and the voltage sag device are all arranged on the guide rails in the diode box body; the station load switch and the insulator fixing plate are both arranged on a guide rail in the rear space of the control box; the grounding and short-circuit fault indicator, the high-voltage electricity utilization monitoring meter and the inlet insulator fixing plate are all arranged on a guide rail in the lower space of the control box; the top end outside the control box is provided with communication equipment;

an external cable is connected with user equipment through an inlet insulator fixing plate, a station load switch and a high-voltage electricity consumption monitoring meter in sequence to form a main loop in a control box; the high-voltage electricity consumption monitoring meter is respectively connected with the load switch controller, the line fault positioning equipment communication terminal, the voltage sag device and the grounding and short-circuit fault indicator to form a secondary circuit in the control box.

Further, the communication device is an antenna.

Furthermore, the load switch controller, the line fault positioning equipment communication terminal and the voltage sag device are all at the same height.

Furthermore, the voltage sag device comprises a low-pass filter, a main controller, an A/D converter connected with the main controller, a photoelectric isolation circuit, a communication interface, an external memory and a display screen, wherein the output end of the low-pass filter is connected with the input end of the A/D converter.

Has the advantages that:

1. the utility model discloses the realization is to the judgement and the locate function of the voltage sag condition of each branch circuit to prevent because the voltage sag can lead to the unit in the user operation to withdraw from the operation because of the relay loses the electricity, cause the impact for the equipment in operation, avoided hindering the production process, bring a large amount of unnecessary losses and because the risk such as large capacity multiple operation unit restart time consumption length for the enterprise.

2. The utility model is provided with the secondary box body, thereby reducing the interference of the voltage sag device from high voltage and ensuring the judgment of the voltage sag condition to be more accurate; and if equipment in the secondary box body breaks down, the box door of the secondary box body can be opened under the condition that power does not need to be cut off, and the fault equipment in the secondary box body can be maintained, so that the influence on other normally-operated equipment caused by the power failure of the whole box body is avoided.

Drawings

FIG. 1 is a schematic diagram of the front structure of the device of the present invention;

FIG. 2 is a schematic view of the back structure of the device of the present invention;

fig. 3 is a block diagram of the voltage sag apparatus of the present invention.

Description of reference numerals: 1. an insulator fixing plate; 2. a separator plate; 3. a station load switch; 4. an incoming insulator fixing plate; 5. a load switch controller; 6. a line fault positioning device communication terminal; 7. a high-voltage electricity consumption monitoring meter; 8. a ground and short fault indicator; 9. a power supply bureau background; 10. an antenna; 11. a control box; 12. a voltage sag device; 13. and a secondary box body.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

In this embodiment, the following changes are made on the basis of the original cable branch box: 1. a secondary box body capable of isolating high-voltage interference is arranged in the cable branch box; 2. the voltage sag detection device is arranged in the secondary box body, and the function of the device mainly realizes acquisition of voltage sag condition data of each branch line, so that the branch box realizes the functions of area positioning and judgment of the branch line with voltage sag, and equipment damage and economic loss caused by long-time voltage sag are avoided.

As shown in fig. 1 and 2, the present embodiment provides a voltage sag fault locating apparatus for a cable branch line, including: the system comprises an insulator fixing plate 1, a station load switch 3, a wire inlet insulator fixing plate 4, a load switch controller 5, a line fault positioning device communication terminal 6, a high-voltage electricity consumption monitoring meter 7, a grounding and short-circuit fault indicator 8, communication equipment, a control box 11, a voltage sag device 12 and a diode box body 13;

a plurality of guide rails which are horizontally arranged and have different heights are arranged in the control box 11, a partition plate 2 with the same length as the top is fixedly arranged at the midpoint of the top in the control box, a certain distance is reserved between the partition plate and the bottom in the control box, the space where the partition plate is arranged in the control box is used as the upper space of the inner space of the control box, and the space below the partition plate is used as the lower space of the inner space of the control box; the upper space of the control box is divided into a front space and a rear space by the isolation board 2, the diode box body 13 is square, is arranged in the front space of the control box and is fixedly connected with the top of the interior of the control box, a plurality of horizontally arranged guide rails are arranged in the diode box body, and the load switch controller 5, the line fault positioning equipment communication terminal 6 and the voltage sag device 12 are all arranged on the guide rails in the diode box body 13; the station load switch 3 and the insulator fixing plate 1 are both arranged on a guide rail in the rear space of the control box; the grounding and short-circuit fault indicator 8, the high-voltage electricity utilization monitoring meter 7 and the inlet wire insulator fixing plate 4 are all arranged on a guide rail in the lower space of the control box; the top end outside the control box is provided with communication equipment;

insulator fixed plate is located station load switch's top in this embodiment, and short-circuit fault indicator is located the top of high-pressure power consumption monitoring table, and high-pressure power consumption monitoring table is located the top of inlet wire insulator fixed plate.

The external cable loops through the inlet wire insulator fixing plate, the station load switch and the high-voltage power consumption monitoring meter are connected with the user equipment to form a main loop in the control box, and the high-voltage power consumption monitoring meter is connected with the load switch controller, the line fault positioning equipment communication terminal, the high-voltage power consumption monitoring meter and the grounding and short-circuit fault indicator respectively to form a secondary loop in the control box.

In this embodiment, the communication device is an antenna 9.

In this embodiment, the load switch controller, the line fault location device communication terminal, and the voltage sag apparatus are all at the same height.

In this embodiment, as shown in fig. 3, the voltage sag apparatus includes a low pass filter, a main controller, an a/D converter connected to the main controller, a photoelectric isolation circuit, a communication interface, an external memory, and a display screen, and an output end of the low pass filter is connected to an input end of the a/D converter.

In the embodiment, a secondary box body 13 and a partition plate 2 are additionally arranged at the upper end in the original control box body, and the partition plate divides the upper end in the box body into a front part and a rear part; the lower end of the control box body is communicated front and back, the secondary box body is positioned at the upper end part inside the control box body, and the voltage sag device, the load switch controller and the line fault positioning equipment communication terminal are arranged inside the secondary box body in parallel; the control box downside is provided with: the high-voltage power utilization monitoring meter comprises a grounding and short-circuit fault indicator, a high-voltage power utilization monitoring meter and a wire inlet insulator fixing plate; the insulator fixing plate and the station load switch are positioned at the upper end part of the back in the box body, the front side is invisible due to the fact that the partition plate is arranged at the upper end part of the box body, the top of the box body is provided with an antenna, and the antenna is communicated to a background server of a power supply office through GPRS; meanwhile, the voltage sag device 12 is used for receiving data in the high-voltage electricity utilization monitoring meter 7, a low-pass filter in the voltage sag device filters the received data, the filtered data are subjected to A/D conversion and then uploaded to the main controller, the main controller analyzes the received data and judges whether voltage sag occurs, if the sag occurs, the analyzed data are communicated to a power supply office background server through an antenna and GPRS, and the power supply office background judges the position of a region where the voltage sag occurs; the embodiment monitors whether the voltage sag occurs in real time so as to avoid the damage of electrical equipment and the shutdown of engineering equipment caused by the long-time voltage sag, thereby avoiding the economic loss and the damage of the engineering equipment. The line fault positioning device communication terminal 6 sends data to the power supply office server 9 in real time through an antenna and a GPRS network, voltage, current, faults, line temperature and line loss conditions of branch points of the buried lines of the urban power supply line are transmitted to the power supply office server 9 in real time, and the power supply office server can analyze incoming line loss areas and position and analyze voltage sag areas in real time.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. A voltage sag fault locating device for a cable branch line, comprising: the system comprises an insulator fixing plate, a station load switch, a wire inlet insulator fixing plate, a load switch controller, a line fault positioning equipment communication terminal, a high-voltage electricity utilization monitoring meter, a grounding and short-circuit fault indicator, communication equipment, a control box, a voltage sag device and a diode box body;

the control box is internally provided with a plurality of guide rails which are horizontally arranged and have different heights, a partition plate with the same length as the top is fixedly arranged at the center line of the top in the control box, a space is reserved between the partition plate and the bottom in the control box, the space where the partition plate in the control box is located is used as the upper space of the inner space of the control box, and the space below the partition plate is used as the lower space of the inner space of the control box; the isolating plate divides the upper space of the control box into a front space and a rear space, the diode box body is square, is arranged in the front space of the control box and is fixedly connected with the top of the inside of the control box, a plurality of horizontally arranged guide rails are arranged in the diode box body, and the load switch controller, the line fault positioning equipment communication terminal and the voltage sag device are all arranged on the guide rails in the diode box body; the station load switch and the insulator fixing plate are both arranged on a guide rail in the rear space of the control box; the grounding and short-circuit fault indicator, the high-voltage electricity utilization monitoring meter and the inlet insulator fixing plate are all arranged on a guide rail in the lower space of the control box; the top end of the outer surface of the control box is provided with communication equipment;

2. The apparatus according to claim 1, wherein the communication device is an antenna.

3. The apparatus of claim 1, wherein the load switch controller, the line fault locator communication terminal, and the voltage sag apparatus are at the same height.

4. The apparatus according to claim 1, wherein the voltage sag fault locating apparatus comprises a low pass filter, a master controller, an a/D converter connected to the master controller, a photoelectric isolation circuit, a communication interface, an external memory and a display screen, and an output terminal of the low pass filter is connected to an input terminal of the a/D converter.