CN207689556U - A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system - Google Patents
A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system Download PDFInfo
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- CN207689556U CN207689556U CN201721079256.1U CN201721079256U CN207689556U CN 207689556 U CN207689556 U CN 207689556U CN 201721079256 U CN201721079256 U CN 201721079256U CN 207689556 U CN207689556 U CN 207689556U
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- current
- metal oxide
- series compensation
- compensation device
- voltage limiter
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims abstract description 44
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 35
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 35
- 239000013307 optical fiber Substances 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 5
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 208000032750 Device leakage Diseases 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000032696 parturition Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The utility model discloses a kind of series compensation device voltage limiter On-line Monitoring of Leakage Current systems, the system comprises more low current sensors, current transformer, platform data unit, optical fiber insulated column and ground monitoring unit, more low current sensors are used to measure the leakage current of each voltage limiter, current transformer is for measuring main capacitor electric current, platform data unit is for leakage current and primary capacitor described in synchronized sampling, processing data simultaneously obtain result of calculation, optical fiber insulated column is for carrying out data transmission, ground monitoring unit is done according to result of calculation to be judged, the system passes through the real time monitoring to leakage current and current in resistance property, the corresponding series compensation device metal oxide pressure-limiting device of assessment whether there is hidden danger；Substantially increase series compensation device and its functional reliability of metal oxide pressure-limiting device.
Description
Technical field
The utility model is related to power equipments to monitor field, and electricity is leaked more particularly, to a kind of series compensation device voltage limiter
Flow on-line monitoring system.
Background technology
Currently, for many years, overall operation is steady for continuous service for the domestic 220kV~1000kV series compensation devices to put into operation, often
Generally there is more than ten to tens metal oxide pressure-limiting device on a series compensation platform, is aoxidized by more metals inside every voltage limiter
Object resistor disc composes in parallel.Metal oxide pressure-limiting device itself has excellent non-linear protection feature, in power grid external area error
When, metal oxide pressure-limiting device can both protect main capacitor in time, be exited in short-term without series compensation device；This greatly improves string
The availability for mending device, also reduces grid disturbance；Although operation power unit all carries out example to most voltage limiter equipment every year
Capable preventive trial, but part voltage limiter can not be come out the defects of making moist and deteriorate by these testing inspections, also once be sent out
Overvoltage can not be undertaken, be damaged by giving birth to failures, the voltage limiters such as the release of metal oxide pressure-limiting device pressure, caused string to mend and exited
Operation, affects the safe and stable operation of power grid, causes the loss of transmission line capability.
Utility model content
In order to solve the problems, such as series compensation device metal oxide pressure-limiting device existing for background technology, there are potential faults, this realities
A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system, the leakage current of metal oxide pressure-limiting device are provided with novel
It only seriously makes moist or aging in the case of can just vary widely in voltage limiter, when slight internal is made moist with aging, variation is not
Greatly, it measures leakage current and cannot get accurate conclusion, even and if the current in resistance property in leakage current makes moist or slight when aging
Large change is will produce, the system assesses corresponding series compensation device gold by the real-time monitoring to leakage current and current in resistance property
Belong to oxide voltage limiter and whether there is hidden danger；
A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system includes：
More low current sensors, the more low current sensors are let out for acquiring corresponding metal oxide pressure-limiting device
Leakage current, the more low current sensor output ends are connected with platform data unit；
Current transformer, the current transformer is for acquiring series compensation device main capacitor electric current, the current transformer
Output end is connected with platform data unit；
Platform data unit, the platform data unit are used for the metal oxygen of more low current sensors of synchronized sampling acquisition
Compound voltage limiter leakage current and the series compensation device main capacitor electric current of current transformer acquisition, carry out analog-to-digital conversion, to each
Data carry out processing calculating, and calculation result data is sent to ground monitoring unit through optical fiber insulated column；
Optical fiber insulated column, the data that the optical fiber insulated column is used to provide the platform data unit to ground monitoring unit
Transmit channel；
Ground monitoring unit, each data that the ground monitoring unit is used to receive and storage platform data cell is sent,
And judge series compensation device voltage limiter with the presence or absence of abnormal according to the comparison result of each data and normal work threshold interval；
Further, the low current sensor is punching structure, and the metal oxide pressure-limiting device bottom is drawn and led
Line passes through low current sensor to be connected with the low-pressure end of metal oxide pressure-limiting device confluence busbar；The metal oxide pressure-limiting device
Low-pressure end confluence busbar be connected with series compensation device low-voltage bus bar；
Further, the low current sensor is connected by shielded cable with platform data unit with current transformer；
Further, the main capacitor is formed by more capacitor unit connection in series-parallel, the main capacitor it is equivalent total
Capacitance C∑It is obtained by the more capacitor units capacitance connection in series-parallel, the capacitor unit capacitance is by factory testing or now
Field actual measurement obtains；The equivalent total resistance R of the main capacitor∑It is obtained by the more capacitor units equivalent resistance connection in series-parallel,
The capacitor unit equivalent resistance is obtained by power consumption experiment；Series-parallel connection type is by m capacitor unit string
Connection composition capacitor unit group, then n capacitor unit group carried out it is in parallel, the capacitor unit be equivalent to by capacitance and etc.
Resistor coupled in parallel composition is imitated, wherein m, n is natural number；
Further, the platform data unit is exported includes to the data of ground monitoring unit：Every metal oxide
Voltage limiter leakage current values, main capacitor voltage value, main capacitor current value, every metal oxide pressure-limiting device voltage and leakage
The current in resistance property value of the power-factor angle of electric current and every metal oxide pressure-limiting device；
Further, the platform data unit synchronizes the leakage current to every metal oxide pressure-limiting device and main electricity
Condenser current samples N number of cycle, sampling interval duration T, wherein 10≤N≤20, N are integer, 50us≤T≤100us.
The beneficial effects of the utility model are：The technical solution of the utility model gives a kind of series compensation device voltage limiter
On-line Monitoring of Leakage Current system, the system extract the current in resistance property of every voltage limiter on the basis of main capacitor electric current, and
Based on this by the real-time monitoring to leakage current and current in resistance property, whether corresponding series compensation device metal oxide pressure-limiting device is assessed
There are hidden danger；Substantially increase series compensation device and its functional reliability of metal oxide pressure-limiting device；The system is not necessarily to simultaneously
Additionally install voltage transformer or divider on series compensation platform additional, solve small series compensation platform equipment free space, characteristics of compact layout, absolutely
The problems such as edge nargin is small.
Description of the drawings
By reference to the following drawings, the illustrative embodiments of the utility model can be more fully understood by：
Fig. 1 is a kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system of specific embodiment of the present invention
Structure chart；
Fig. 2 is that the string of specific embodiment of the present invention mends each capacitor cell connection relationship diagram in main capacitor.
Specific implementation mode
The illustrative embodiments of the utility model are introduced referring now to the drawings, however, the utility model can use many
Different forms is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be in order at large and complete
Open the utility model entirely, and fully convey the scope of the utility model to person of ordinary skill in the field.For
Term in the illustrative embodiments being illustrated in the accompanying drawings is not the restriction to the utility model.In the accompanying drawings, identical
Cells/elements use identical reference numeral.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related field has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is a kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system of specific embodiment of the present invention
Structure chart；Described device acquires synchrodata by more low current sensors and current transformer, through platform data unit into
Row analog-to-digital conversion and processing calculate, and obtain checkout result and are sent to ground monitoring unit, ground monitoring list by optical fiber insulated column
Member carries out analysis assessment to monitored results；A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system includes：
More low current sensor CT-1 to CT-k, the more low current sensors are for acquiring corresponding metal oxidation
Object voltage limiter leakage current, the more low current sensor output ends are connected with platform data unit；
Current Transmit, for the Current Transmit for acquiring series compensation device main capacitor electric current, the electric current is mutual
Sensor output end is connected with platform data unit 101；
Platform data unit 101, the platform data unit 101 is for more low current sensor acquisitions of synchronized sampling
Metal oxide pressure-limiting device leakage current and the series compensation device main capacitor electric current of current transformer acquisition, carry out modulus and turn
It changes, processing calculating is carried out to each data, and calculation result data is sent to ground monitoring unit 103 through optical fiber insulated column 102；
Optical fiber insulated column 102, the optical fiber insulated column 102 is for providing the platform data unit to ground monitoring unit
103 data transfer channel；
Ground monitoring unit 103, the ground monitoring unit 103 are sent for receiving simultaneously storage platform data cell 101
Each data, and according to each data and work normally threshold interval comparison result judge series compensation device voltage limiter whether there is it is different
Often；
Further, the series compensation device includes k to number is MOV-1 to MOV-k metal oxide pressure-limiting devices, at every
Low current sensor is installed, corresponding low current sensor number is followed successively by CT-1 to CT-k on metal oxide pressure-limiting device；It is excellent
Choosing, the low current sensor is punching structure, and the conducting wire that metal oxide pressure-limiting device bottom is drawn passes through micro-current
Sensor, and be connected with the low-pressure end of metal oxide pressure-limiting device confluence busbar；The series compensation device main capacitor low pressure termination
Line installs Current Transmit；The Current Transmit is punching structure；In the present embodiment, micro-current current sensor
Center bore is 30mm to 100mm；Low current sensor measurement range is 50 μ A to 100mA, maximum output voltage signal be ±
7V；It is 1A that the current transformer primary side rated current, which takes series compensation platform rated current, secondary output current,；
Preferably, for compact layout, low current sensor is mounted on metal oxide pressure-limiting device bottom close to busbar
The position of side；
Preferably, the low current sensor is connected by shielded cable with platform data unit with current transformer；
Further, the method for the platform data unit calculating current amplitude and phase includes Fast Fourier Transform (FFT) side
Method and harmonic analysis method；
Further, the series compensation device main capacitor is connected in parallel on high voltage bus and low pressure mother with metal oxide pressure-limiting device
Between line；
Further, as shown in Fig. 2, the equivalent total capacitance C of the main capacitor∑By the more capacitor unit capacitances
Amount connection in series-parallel show that the capacitor unit capacitance is obtained by factory testing or field measurement；The main capacitor it is equivalent
All-in resistance R∑Show that the capacitor unit equivalent resistance is tried by power consumption by the more capacitor units equivalent resistance connection in series-parallel
Test and obtain, series-parallel system be m capacitor unit is composed in series capacitor unit group, then by n capacitor unit group into
Row is in parallel, and the equivalent resistance includes that the loss of capacitor unit inner lead, dielectric loss, parallel discharge resistance loss etc. are many
Component, every capacitor unit are equivalent to the circuit composed in parallel by capacitance and equivalent resistance；Wherein m, n are natural number；
Further, the platform data unit is exported includes to the data of ground monitoring unit：Every metal oxide
Voltage limiter leakage current values, main capacitor voltage value, main capacitor current value, every metal oxide pressure-limiting device voltage and leakage
The current in resistance property value of the power-factor angle of electric current and every metal oxide pressure-limiting device.
Obviously, those skilled in the art can carry out the utility model various modification and variations without departing from this practicality
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (5)
1. a kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system, the system comprises：
More low current sensors, the more low current sensors are for acquiring corresponding metal oxide pressure-limiting device leakage electricity
Stream, the more low current sensor output ends are connected with platform data unit；
Current transformer, the current transformer is for acquiring series compensation device main capacitor electric current, the current transformer output
End is connected with platform data unit；
Platform data unit, the platform data unit are used for the metal oxide of more low current sensors of synchronized sampling acquisition
Voltage limiter leakage current and the series compensation device main capacitor electric current of current transformer acquisition, carry out analog-to-digital conversion, to each data
Processing calculating is carried out, and calculation result data is sent to ground monitoring unit through light insulated column；
Optical fiber insulated column, the data transmission that the optical fiber insulated column is used to provide the platform data unit to ground monitoring unit
Channel；
Ground monitoring unit, each data that the ground monitoring unit is used to receive and storage platform data cell is sent, and root
Comparison result according to each data and normal work threshold interval judges series compensation device voltage limiter with the presence or absence of abnormal.
2. system according to claim 1, it is characterised in that：The low current sensor is punching structure, the gold
Belong to oxide voltage limiter bottom extraction wire and passes through the low-pressure end of low current sensor and metal oxide pressure-limiting device confluence busbar
It is connected；The low-pressure end confluence busbar of the metal oxide pressure-limiting device is connected with series compensation device low-voltage bus bar.
3. system according to claim 1, it is characterised in that：The low current sensor passes through shielding with current transformer
Cable is connected with platform data unit.
4. system according to claim 1, it is characterised in that：The platform data unit is exported to ground monitoring unit
Data include：Every metal oxide pressure-limiting device leakage current values, main capacitor voltage value, main capacitor current value, every gold
Belong to oxide voltage limiter voltage and the power-factor angle of leakage current and the current in resistance property value of every metal oxide pressure-limiting device.
5. system according to claim 1, it is characterised in that：The platform data unit is synchronized to every metal oxide
The leakage current and the N number of cycle of main capacitor current sample of voltage limiter, sampling interval duration T, wherein 10≤N≤20, N
For integer, 50us≤T≤100us.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721079256.1U CN207689556U (en) | 2017-08-25 | 2017-08-25 | A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721079256.1U CN207689556U (en) | 2017-08-25 | 2017-08-25 | A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system |
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| Publication Number | Publication Date |
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| CN207689556U true CN207689556U (en) | 2018-08-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525996A (en) * | 2017-08-25 | 2017-12-29 | 中国电力科学研究院 | A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method and system |
| CN107525996B (en) * | 2017-08-25 | 2024-04-30 | 中国电力科学研究院 | Online monitoring method and system for leakage current of voltage limiter of series compensation device |
-
2017
- 2017-08-25 CN CN201721079256.1U patent/CN207689556U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525996A (en) * | 2017-08-25 | 2017-12-29 | 中国电力科学研究院 | A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method and system |
| CN107525996B (en) * | 2017-08-25 | 2024-04-30 | 中国电力科学研究院 | Online monitoring method and system for leakage current of voltage limiter of series compensation device |
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