CN207882393U - A kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus - Google Patents
A kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus Download PDFInfo
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- CN207882393U CN207882393U CN201820334392.9U CN201820334392U CN207882393U CN 207882393 U CN207882393 U CN 207882393U CN 201820334392 U CN201820334392 U CN 201820334392U CN 207882393 U CN207882393 U CN 207882393U
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- 238000009413 insulation Methods 0.000 title claims abstract description 33
- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000004132 cross linking Methods 0.000 title claims abstract description 18
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- 238000012806 monitoring device Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
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- 239000004698 Polyethylene Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
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Abstract
The utility model is a kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus, is made of cable grounding line current sensor, cable zero sequence current sensor, bus residual voltage sensor, temperature of cable junction sensor, ethernet communication device, background computer.Wherein cable grounding line current sensor is mounted on cable grounding line, and cable zero sequence current sensor, bus residual voltage sensor and temperature of cable junction sensor are mounted on cable outlet.Cable grounding line current sensor, cable zero sequence current sensor, bus residual voltage sensor and the collected data of temperature of cable junction sensor are transmitted in background computer by ethernet communication device and are handled.Concern cable operating condition in real time, it is ensured that the power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus and monitoring method of power distribution network safe operation.
Description
Technical field
The utility model relates to power equipments and equipment technical field, and in particular to be that a kind of crosslinking of power distribution network is poly-
Ethylene cable insulation state monitoring apparatus.
Background technology
Twisted polyethylene cable because of the advantages that its simple in structure, light heat-resisting, load capacity is strong, high mechanical strength, with
Power grid is used widely.The design service life of twisted polyethylene cable is generally 30 years, with the increase of service life, by
The factors such as heat, oxygen, temperature, humidity and mechanical stress influence, and cable later stage in use, insulating layer is easy to happen aging, occur
Branch leads to insulation breakdown, causes singlephase earth fault, threatens power supply and distribution safety.
At this stage, the state of insulation of cable judges mainly to judge by preventive trial, i.e., periodical power failure is come to electricity
Cable is tested.Which can not probe into the state of cable in operation, can not reflect in real time to insulation fault, and need to stop
Electricity impacts the power supply of important load.
With sensor technology, the fast development of power electronic technique, microcomputer technology, status monitoring accordingly grows up.
Cable insulation occurs in ageing process, the variation of electrical, physics, chemistry etc. amount is had, by acquiring, analyzing this tittle
The monitoring to cable status is realized in variation.The monitoring system based on GPS is developed in Japan, it can be to land and submarine cable
Carry out aging monitoring；In Germany, the processing of sensor, signal transmission and back-end data is formed to the subsystem of a networking, it can
Cable temperature is accurately measured.Domestic Condition Monitoring Technology occurs than later, and Hangzhou electric company, which has developed, adopts
With PI databases temperature, operation cable current and the current-carrying capacity centralized display device being calculated in real time；Kunming electric company
In the cable system newly laid, by monitoring cable running current, circulating current, moment of fault current signal, Partial discharge signal
And distributed temperature measuring optical fiber monitors the operating status of cable.Common cable insulation state monitoring method includes DC component
Method, dielectric loss method, shelf depreciation method, exchange injection method etc..The branch rectifier that DC component method is occurred by insulating layer aging obtains, but
Only nA grades, acquisition difficulty is too big, is easily submerged in noise；Dielectric loss method using aging cable capacitive current component with it is resistive
Current component ratio is worth to, but react be whole cable insulation situation, can not know local state；It is super obtained by shelf depreciation
Sound wave or electromagnetic wave are influenced by cable shield, it is difficult to effectively acquisition；It is complicated for operation to exchange injection method, is not easy live popularize and answers
With.
Generally, China is not also very deep to the status monitoring research of power distribution network twisted polyethylene cable, corresponding to fill
It is not mature enough to set field application, be badly in need of research one kind effective, easy can carry out insulation prison to power distribution network twisted polyethylene cable
The device of survey.
When aging occurs for cable insulation, cable insulation against ground resistance can change with capacitance, and then cause to be grounded
Line current changes, while serious aging can make supply current zero-sequence current occur, occur residual voltage, cable in busbar
The temperature of connector will appear a degree of raising.In this, as characteristic quantity, crosslinking polyethylene-insulated cable insulation layer quality is carried out
Judge.
Invention content
For the shortcoming of existing power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus, the utility model design
It is a kind of to be monitored according to the comprehensive state to cable of aforementioned four monitoring variable, cable is paid close attention in real time runs feelings
Condition, it is ensured that the power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus of power distribution network safe operation.
To achieve the above object, the technical solution of the utility model is：
A kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus, the monitoring device are passed by cable grounding line current
Sensor, cable zero sequence current sensor, bus residual voltage sensor, temperature of cable junction sensor, ethernet communication device
It is formed with background computer；Wherein, the cable grounding line current sensor is mounted on cable grounding line, to acquire ground connection
Electric current on line；The cable zero sequence current sensor is mounted on cable outlet, to acquire zero in cable transmission electric current
Order components；The bus residual voltage sensor is mounted on cable outlet, to acquire the voltage on busbar；The cable connects
Head temperature sensor is mounted on cable outlet, to measure cable conductor layer temperature；The ethernet communication device input terminal
It is sensed with cable grounding line current sensor, cable zero sequence current sensor, bus residual voltage sensor, temperature of cable junction
Device is connected, and is responsible for that data processing will be monitored in collected four groups of characteristic quantity signal transmissions to background computer.
Preferably, the background computer is mounted with Virtual instrument LabVIEW software, can be to monitoring data at
Reason.
Preferably, use coaxial cable as transmission medium in the ethernet communication device.
Preferably, the cable grounding line current sensor uses DH-0.66 series I type current transformers.
Preferably, the cable zero sequence current sensor uses HS-LJK zero sequence current mutual inductors.
Preferably, the bus residual voltage sensor uses JDZ (X) 6-35QRW voltage transformers.
Preferably, the temperature of cable junction sensor uses NTC temperature sensors.
Compared with prior art, the utility model advantage is：
（1）Cable grounding line current is capable of the insulation situation of the crosslinked polyetylene insulated layer of accurate response, and is easy to measure,
Ancillary equipment need not additionally be increased, operability is strong；Cable zero-sequence current is to change to insulating layer with bus residual voltage
Sensitive physical quantity, can be by zero sequence capacitance, accurate characterization cable insulation situation；Temperature of cable junction then can be indicated effectively
The operating condition for going out cable conductor layer reacts the thermal insulation of cable.
（2）Ethernet communication device is as present apparatus data transfer mode, and speed is high, the bit error rate is low, program portability
By force, it can be achieved that bidirectional serial communication, is used for the communication of industrial field device and host.
Description of the drawings
Fig. 1 is power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus structural schematic diagram described in the utility model.
Specific implementation mode
Below in conjunction with attached drawing, the utility model is further described by specific embodiment.
In conjunction with attached drawing 1, a kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus is passed by cable grounding line current
Sensor 1, cable zero sequence current sensor 2, bus residual voltage sensor 3, temperature of cable junction sensor 4, ethernet communication
Device 5, background computer 6 form.Wherein cable grounding line current sensor 1 is mounted on cable grounding line 7, cable zero sequence electricity
Flow sensor 2, bus residual voltage sensor 3 and temperature of cable junction sensor 4 are mounted on cable outlet 8.Cable grounding
Line current sensor 1, cable zero sequence current sensor 2, bus residual voltage sensor 3 and temperature of cable junction sensor 4 are adopted
The data collected are transmitted in background computer 6 by ethernet communication device 5 and are handled.
Cable grounding line current sensor 1 is responsible for the electric current on acquisition ground wire, is transformed into 0-20mA ranges, convenient for passing
It is defeated.
Cable zero sequence current sensor 2 is transformed into 0-20mA ranges acquiring the zero-sequence component in cable transmission electric current,
Convenient for transmission.
Bus residual voltage sensor 3 is converted to the output of 0-5V ranges to acquire the voltage on busbar.
Temperature of cable junction sensor 4, which is mainly responsible for, measures cable conductor layer temperature, and converts heat to electricity, is convenient for
Output.
Ethernet communication device 5 uses coaxial cable as transmission medium, is responsible for passing collected four groups of characteristic quantity signals
It is defeated in background computer.
Background computer 6 is mounted with Virtual instrument LabVIEW software, can handle a large amount of monitoring data, packet
Include filtering, data are shown, Waveform storage, human-computer interaction, printout etc..
The course of work is as follows：
Step 1: device is installed：Installation ground connection line current sensor 1, distinguishes at cable outlet at cable grounding line
Zero sequence current sensor 2, bus residual voltage sensor 3, temperature of cable junction sensor 4 are installed；
Step 2: data acquisition and transmission：Earth wire electric current, zero-sequence current, residual voltage and temperature of cable junction four
A monitoring variable carries out data acquisition using the harvester based on LabVIEW, then by ethernet communication device 5 by acquisition
It is handled in data transmission to background computer 6；
Step 3: Data Management Analysis：Mishap Database is established in background computer 6, utilizes wavelet de-noising and frequency dividing
Amplifying technique handles signal, and extraction correlated characteristic is matched with the fault signature in database, completes corresponding fault pre-alarming；
Step 4: figure master control interface forms：The graphical master control interface in backstage is made of five parts, respectively systematic parameter
Setting, characteristic signal processing, waveform analysis is shown, Mishap Database is established and the inquiry of historical data；Wherein, system parameter settings
Including cable-line parameter selection and data acquisition parameters setting；
Characteristic signal processing includes frequency dividing amplification and wavelet de-noising；
Waveform analysis show including real-time waveform show and waveform details check；
Mishap Database foundation includes normal data dilutionization, fault data write-in and Trouble Match early warning；
The inquiry of historical data includes that history file is checked and Excel output interfaces.
Compared with prior art, the utility model advantage is：
（1）Cable grounding line current is capable of the insulation situation of the crosslinked polyetylene insulated layer of accurate response, and is easy to measure,
Ancillary equipment need not additionally be increased, operability is strong；Cable zero-sequence current is to change to insulating layer with bus residual voltage
Sensitive physical quantity, can be by zero sequence capacitance, accurate characterization cable insulation situation；Temperature of cable junction then can be indicated effectively
The operating condition for going out cable conductor layer reacts the thermal insulation of cable.
（2）Ethernet communication device is as present apparatus data transfer mode, and speed is high, the bit error rate is low, program portability
By force, it can be achieved that bidirectional serial communication, is used for the communication of industrial field device and host.
（3）Background computer, which is integrated with, can merge many algorithms, the LabVIEW softwares with software instead of hardware, in number
According in processing have unrivaled advantage.
It the above is only the preferred embodiment of the present invention, it should be pointed out that：Those skilled in the art are come
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (7)
1. power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus, it is characterised in that：The monitoring device is by cable grounding line
Current sensor（1）, cable zero sequence current sensor（2）, bus residual voltage sensor（3）, temperature of cable junction sensor
（4）, ethernet communication device（5）And background computer（6）Composition；
Wherein, the cable grounding line current sensor（1）Mounted on cable grounding line（7）On, to acquire on ground wire
Electric current；
The cable zero sequence current sensor（2）Mounted on cable outlet（8）On, to acquire the zero sequence in cable transmission electric current
Component；
The bus residual voltage sensor（3）Mounted on cable outlet（8）On, to acquire the voltage on busbar；
The temperature of cable junction sensor（4）Mounted on cable outlet（8）On, to measure cable conductor layer temperature；
The ethernet communication device（5）Input terminal and cable grounding line current sensor（1）, cable zero sequence current sensor
（2）, bus residual voltage sensor（3）, temperature of cable junction sensor（4）It is connected, is responsible for collected four groups of characteristic quantities
Signal transmission is to background computer（6）In be monitored data processing.
2. a kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus according to claim 1, it is characterised in that：
The background computer（6）It is mounted with Virtual instrument LabVIEW software, monitoring data can be handled.
3. a kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus according to claim 1, it is characterised in that：
The ethernet communication device（5）It is middle to use coaxial cable as transmission medium.
4. a kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus according to claim 1, it is characterised in that：
The cable grounding line current sensor（1）Using DH-0.66 series I type current transformers.
5. a kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus according to claim 1, it is characterised in that：
The cable zero sequence current sensor（2）Using HS-LJK zero sequence current mutual inductors.
6. a kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus according to claim 1, it is characterised in that：
The bus residual voltage sensor（3）Using JDZ (X) 6-35QRW voltage transformers.
7. a kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus according to claim 1, it is characterised in that：
The temperature of cable junction sensor（4）Using NTC temperature sensors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820334392.9U CN207882393U (en) | 2018-03-12 | 2018-03-12 | A kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus |
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| CN201820334392.9U CN207882393U (en) | 2018-03-12 | 2018-03-12 | A kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490329A (en) * | 2018-03-12 | 2018-09-04 | 国网江苏省电力有限公司徐州供电分公司 | Power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus and monitoring method |
| CN109683089A (en) * | 2018-11-30 | 2019-04-26 | 江苏大学 | Motor bus high resistance connecting fault detection device and method based on WSN |
| CN110687408A (en) * | 2019-10-15 | 2020-01-14 | 清华大学 | Cable insulation monitoring method and device |
-
2018
- 2018-03-12 CN CN201820334392.9U patent/CN207882393U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490329A (en) * | 2018-03-12 | 2018-09-04 | 国网江苏省电力有限公司徐州供电分公司 | Power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus and monitoring method |
| CN109683089A (en) * | 2018-11-30 | 2019-04-26 | 江苏大学 | Motor bus high resistance connecting fault detection device and method based on WSN |
| CN110687408A (en) * | 2019-10-15 | 2020-01-14 | 清华大学 | Cable insulation monitoring method and device |
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