CN213122168U

CN213122168U - Cable line distributed fault accurate positioning device

Info

Publication number: CN213122168U
Application number: CN202021857301.3U
Authority: CN
Inventors: 王志强; 王振浩; 李翀; 马明; 贾克音; 王朝斌; 丁镇; 贾曜诚
Original assignee: Jilin Longbo Electric Technology Co ltd
Current assignee: Jilin Longbo Electric Technology Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-05-04
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a cable run distributing type trouble accurate positioning device, include: a high frequency sensor, which is arranged on the shielding layer at the two ends of the cable; the three-axis accelerators are sleeved on the cable at equal intervals; a plurality of electric thermocouples are sleeved on the cable at equal intervals; the utility model relates to a high tension cable trade technical field. By adopting the traveling wave distance measurement technology of the method, the fault position of a cable line can be rapidly and accurately positioned, whether the fault point is an overhead line fault or a cable fault is judged, corresponding technical support is provided for relevant operation and maintenance personnel in the aspect of fault troubleshooting according to the accurate fault point positioning, the fault troubleshooting is rapidly and efficiently carried out, the maintenance and power supply time of the power industry is shortened, the social and economic benefit loss caused by power failure is reduced, the economic loss is greatly reduced, and the operation and maintenance unit is ensured to meet the requirements of relevant national policy specifications in corresponding work and check.

Description

Cable line distributed fault accurate positioning device

Technical Field

The utility model relates to a high tension cable trade technical field specifically is a cable run distributing type trouble accurate positioning device.

Background

With the continuous development of power grid construction, 110/220Kv power cable power supply lines are increasingly applied to urban power grid construction. At present, after a cable has a ground fault, the influence possibly caused by a large power supply radius is also large. Therefore, the research on the rapid online positioning method for 110/220Kv power cable faults and the real-time online monitoring of circulating current have important significance for improving the power supply quality.

At present, overhead lines and cable mixed lines in the power industry are gradually increased, and when faults occur in the daily operation and maintenance process, the fault points and the fault positions are difficult to determine quickly, so that great troubles are brought to the daily operation and maintenance work. In the past, an offline detection device and a manual troubleshooting mode are adopted for fault finding, the efficiency is low, and a fault point cannot be accurately determined. Therefore, there is a need for an online monitoring device in the industry, which can quickly determine a fault point and a fault type when a fault occurs during the operation of a cable in real time online monitoring, and store and send the fault point and the fault type through the online monitoring device, and software equipment can perform alarm reminding and short message pushing.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a cable run distributing type trouble accurate positioning device has solved current present electric power industry overhead line and cable hybrid line and has increased gradually, when breaking down at daily fortune dimension in-process, hardly confirms fault point and fault location fast, keeps the electric work and brings huge trouble for daily fortune dimension. In the past, an offline detection device and a manual troubleshooting mode are adopted for fault finding, the efficiency is low, and a fault point cannot be accurately determined.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the method comprises the following steps:

a high frequency sensor, which is arranged on the shielding layer at the two ends of the cable;

the three-axis accelerators are sleeved on the cable at equal intervals;

a plurality of electric thermocouples are sleeved on the cable at equal intervals;

the protective box is arranged at the proper positions of the double ends of the high-voltage cable to be monitored and the grounding point of the cross interconnection point sheath;

and the lead storage battery is arranged inside the protective box.

Preferably, the method further comprises the following steps: the system monitoring host is installed in the transformer substation or in the dispatching room and is responsible for accessing the system cloud platform.

Preferably, the high-frequency sensor is wired to the metal shielding layer of the cable through a lower through pipe of the protective box, is suspended and fixed according to the correct direction, and performs the protection work of sensor insulation, water resistance, moisture resistance and the like,

preferably, a GPS antenna and a 4G antenna are arranged in the protective box, the top of the protective box is fixed through the lower wall surface of the protective box through a pipe, and the 4G antenna is not shielded in installation.

Advantageous effects

The utility model provides a cable run distributing type trouble accurate positioning device. The method has the advantages that by adopting the traveling wave distance measurement technology, the fault position of the cable line can be rapidly and accurately positioned, whether the fault point is an overhead line fault or a cable fault is judged, corresponding technical support is provided for relevant operation and maintenance personnel in the aspect of fault troubleshooting according to the accurate fault point positioning, the fault troubleshooting is rapidly and efficiently carried out, the maintenance and power supply time of the power industry is shortened, the social and economic benefit loss caused by power failure is reduced, the economic loss is greatly reduced, and the operation and maintenance units are ensured to meet the requirements of relevant national policy specifications in corresponding work and assessment.

Drawings

Fig. 1 is a schematic structural diagram of a cable line distributed fault accurate positioning device according to the present invention;

fig. 2 is the utility model discloses a cable run distributing type trouble accurate positioning device's inside cross-sectional view of protective housing.

Fig. 3 is a front view of the high frequency sensor installation of the cable line distributed fault location device of the present invention.

Fig. 4 is a modern D-type traveling wave distance measuring schematic diagram of the cable line distributed fault accurate positioning device.

In the figure, 1, a high-frequency sensor; 2. a three-axis accelerator; 3. a three-axis accelerator; 4. a protective box; 5. a lead storage battery.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a distributed fault accurate positioning device for a cable line utilizes a D-type distance measurement principle to carry out fault point distance measurement, and the specific method is that a high-speed high-frequency sensor 1, a GPS and a Beidou time service device are installed on the cable line, and when a fault occurs, the devices are used for quickly reading and recording the time of a fault initial traveling wave surge reaching an acquisition device to carry out distance measurement calculation.

Referring to fig. 4, assuming that the time required to travel to the M-side and N-side buses at the same propagation velocity v is one TM and the other TN, the following relationship exists.

In the formula, the lengths from the M end bus and the N end bus to a fault point are respectively expressed by DMF and DNF; l is the length of the line MN.

Simultaneous solution to obtain DMF and DNF

In the formula, v represents the propagation speed of the traveling wave in the distribution line.

In order to more accurately obtain the time point when the initial fault traveling wave surge moves to the buses at two ends, real-time clocks with good accuracy and good stability must be installed at two ends of the line, and in addition, the clocks at two ends must be maintained to be in synchronous operation. Moreover, various data at two ends of the line are acquired synchronously every moment, and in addition, fault transient waveforms are accumulated and stored and are correspondingly processed, which is also indispensable.

Fault waveform collection is achieved through high-precision A/D sampling, 20ns precision time service is achieved through GPS and Beidou positioning, and waveform sampling is achieved through 400MHz sampling frequency.

The fault positioning method based on the D-type traveling wave principle directly applies the D-type principle to power supply cable monitoring, on one hand, the influence of a complex refraction and reflection process of traveling waves is eliminated, on the other hand, a line where a fault point is located can be directly determined, and traveling wave positioning of the fault point of the line is achieved. Therefore, accurate positioning of the cable fault position is realized, fault points and fault positions in the hybrid line are judged, operation and maintenance time is greatly shortened for operation and maintenance personnel, and power supply safety and timeliness are guaranteed.

By adopting the traveling wave distance measurement technology of the method, the fault position of a cable line can be rapidly and accurately positioned, whether the fault point is an overhead line fault or a cable fault is judged, corresponding technical support is provided for relevant operation and maintenance personnel in the aspect of fault troubleshooting according to the accurate fault point positioning, the fault troubleshooting is rapidly and efficiently carried out, the maintenance and power supply time of the power industry is shortened, the social and economic benefit loss caused by power failure is reduced, the economic loss is greatly reduced, and the operation and maintenance unit is ensured to meet the requirements of relevant national policy specifications in corresponding work and check.

After the high-frequency sensor 1 is installed at the direct grounding point of a cable shielding layer or the cable head pokes away a shielding layer wire core, when a cable breaks down, high-frequency transient traveling wave current signals (the cable shielding layer) or high-frequency transient voltage traveling wave signals (the cable core) are collected, the signals are analyzed and processed by a system platform and are uploaded to a system background, the system background automatically calculates the distance of a fault point through waveform analysis by a double-end distance measuring technology, the position of the fault point is indicated by the system background, the double-end automatic distance measuring technology is adopted, the distance measurement and calculation of the fault point are realized, the position of the fault point is clearly indicated on a system background interface, the fault point is marked, and the fault.

The system platform comprises a main control unit (CPU board), a high-speed data acquisition unit (DAU board), a GPS time service module, a 4G communication module, a power module and the like, and the device acquires a time tag when a current signal of a cable grounding wire is acquired through a specially-developed current sensor; the device has a remote wireless communication function, acquired information is uploaded to a system software platform through a 4G wireless module, the system platform has a real-time circulation monitoring function, a circulation alarm threshold can be set, and potential cable faults caused by damage of the protective layer can be found in time. The method comprises the steps of monitoring the insulating condition of an outer sheath of a cable line in real time, drawing a circulating current curve, carrying out fault alarm on an abnormal cable insulated by the outer sheath, and utilizing the cable online monitoring principle of the steady-state current of a grounding wire. Once the metal sheath layer is grounded at multiple points, the steady-state grounding current (circulating current) after forming a loop with the ground is increased remarkably.

Therefore, the insulation fault of the cable metal sheath can be found in time by monitoring the steady-state grounding current and the variable quantity of the steady-state grounding current in the cable metal sheath in real time, so that the hidden danger of the main insulation fault of the cable is eliminated, and a maintenance worker can also realize the remote monitoring of the system by accessing the internet and logging in the account number after the system platform is deployed at a cloud service end or a local main station, so as to know the running condition information of the cable in real time. Maintenance personnel can rapidly and correctly process the line fault, the automation degree of the power grid is greatly improved, the safety and the reliability of the power grid are ensured, a large amount of manpower and material resource consumption is reduced, and the operation cost is saved.

A plurality of triaxial accelerators are respectively sleeved on the cable at equal intervals, the triaxial accelerators adopt piezoresistive, piezoelectric and capacitive working principles, the generated acceleration is in direct proportion to the change of resistance, voltage and capacitance and is acquired through corresponding amplifying and filtering circuits, and then the triaxial accelerators are connected with a data port of the system platform barrel, so that the triaxial accelerators transmit acquired signals to the system platform.

The thermocouples are sleeved on the cable at equal intervals to directly measure the temperature and convert the temperature signals into thermoelectromotive force signals, and the thermocouples are connected with a data port of the system platform through data lines, so that signal transmission is facilitated.

The power supply module in the system platform is in a hot backup state, and when the AC220V power supply is powered off, the system platform can continuously work for 2-3h, so that the integrity of data acquired at the moment of power off is ensured. The power-off protection effect is achieved.

The special description is that: the system has the advantages that enough user space is provided for each user, the user can randomly access the field system monitoring condition through the browser at any time and place, the historical data of the system is stored permanently, history checking is facilitated, unattended operation is achieved, the alarm information and the working state can be transmitted to relevant personnel in a short message and APP pushing mode, real-time information storage is achieved, historical data query can be conducted, and the alarm information printing and the like can be conducted.

The protective box 4 is arranged at the proper positions of the double ends of the high-voltage cable to be monitored and the grounding point of the cross interconnection point sheath; through using protective housing 4, the connection of this device of being convenient for use high frequency sensor 1, a plurality of triaxial accelerator 2 and a plurality of thermocouple is convenient for carry out real-time supervision to the cable, lets the cable receive the striking and rocks, or the high temperature influence leads to cable high temperature to rise the damaged system platform that can in time transport of reason, can be reasonable monitor the cable.

A lead storage battery 5 mounted inside the protective case 4;

a solar panel is arranged on the protective box 4;

the system monitoring host computer, the system monitoring host computer is installed in the transformer substation or in the dispatch room, is responsible for visiting the cloud platform of system, and the system monitoring host computer need insert can visit the net twine of internet or visit the internet through 4G wireless router, and system software sets up at cloud server end, is responsible for data processing and circuit operational aspect warning to carry out automatic positioning to the fault point, with cell-phone SMS, APP propelling movement, warning bullet window etc. multiple mode suggestion fortune dimension personnel, high frequency sensor 1 is managed to walk line to cable metal shielding layer department under through protective housing 4, hangs fixedly according to the correct direction.

Be equipped with GPS antenna, 4G antenna in the protective housing 4, one set of high frequency sensor 1 is respectively installed at the both ends of every cable run, and the device mounting means is as follows:

the protective box is arranged at the proper positions of the double ends of the high-voltage cable to be monitored and the grounding point of the cross interconnection point sheath. The sensor and the antenna connecting wire enter from the lower part of the protective box through a pipe;

the high-frequency sensor 1 is wired to the metal shielding layer of the cable through a lower through pipe of the protective box 4, is suspended and fixed according to the correct direction, and performs the protection work of sensor insulation, water resistance, moisture resistance and the like;

GPS antenna, 4G antenna, it is fixed to walk the top of line to protective housing 4 through 4 lower poling of protective housing, and the antenna installation requirement is unshielded.

The high-frequency sensor 1 is powered by solar energy, and accessories such as a solar panel, a lead storage battery and the like need to be installed at a monitoring position. The storage battery is arranged in the protective box, and the solar panel is arranged at the top end of the protective box; the lead storage battery provides a 24V stable power supply, and the battery has continuous power supply capacity for more than 10 days under no sunlight condition.

In this embodiment, it should be noted that: the high-frequency sensor 1 is communicated with a system cloud service platform through a 4G wireless network.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A cable run distributed fault pinpointing device, comprising:

a high-frequency sensor (1) which is arranged on the shielding layer at the two ends of the cable;

the triaxial accelerators (2) are sleeved on the cable at equal intervals;

a plurality of electric thermocouples (3) which are sleeved on the cable at equal intervals;

the protective box (4) is arranged at the proper positions of the double ends of the high-voltage cable to be monitored and the grounding point of the cross interconnection point sheath;

and a lead storage battery (5) which is mounted inside the protective box (4).

2. The cable line distributed fault pinpointing device of claim 1, further comprising: the system monitoring host is installed in the transformer substation or in the dispatching room and is responsible for accessing the system cloud platform.

3. The distributed fault accurate positioning device of the cable line according to claim 1, wherein the high frequency sensor (1) is wired to the cable metal shielding layer through a lower through pipe of the protection box (4), and is suspended and fixed in a correct direction, and the protection work such as sensor insulation, water and moisture prevention is performed.

4. The distributed fault precise positioning device for the cable lines according to claim 1, wherein a GPS antenna and a 4G antenna are arranged in the protective box (4), and are fixed by passing a pipe through the lower wall surface of the protective box (4) to the top of the protective box (4), and the 4G antenna is installed without shielding.