CN107525996A - A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method and system - Google Patents
A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method and system Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims abstract description 102
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 239000013307 optical fiber Substances 0.000 claims abstract description 11
- 230000001360 synchronised effect Effects 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 83
- 150000004706 metal oxides Chemical class 0.000 claims description 83
- 238000005259 measurement Methods 0.000 claims description 22
- 208000032750 Device leakage Diseases 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
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- 238000010586 diagram Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method and system, methods described uses low current sensor and current transformer synchronous acquisition series compensation device main capacitor electric current and each voltage limiter leakage current, the phase and amplitude of each electric current is calculated, and then using the electric current of main capacitor as reference data, calculate the phase angle of voltage limiter voltage and leakage current and the current in resistance property of each voltage limiter, by above-mentioned result of calculation compared with threshold value, to determine that corresponding voltage limiter whether there is potential faults；The system includes more low current sensors, current transformer, platform data unit, optical fiber insulated column and ground monitoring unit, more low current sensors are used for the leakage current for measuring each voltage limiter, current transformer is used to measure main capacitor electric current, platform data unit is used for processing data and draws result of calculation, optical fiber insulated column is used to carry out data transmission, and ground monitoring unit is done according to result of calculation to be judged.
Description
Technical field
The present invention relates to power equipment to monitor field, exists more particularly, to a kind of series compensation device voltage limiter leakage current
Line monitoring method and system.
Background technology
At present, for many years, overall operation is steady for continuous service for the domestic 220kV~1000kV series compensation devices to put into operation, often
Typically there is more than ten to tens metal oxide pressure-limiting device on individual series compensation platform, aoxidized inside every voltage limiter by more metals
Thing resistor disc composes in parallel.Metal oxide pressure-limiting device possesses excellent non-linear protection feature in itself, in power network 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 of device is mended, also reduces grid disturbance；Although operation power unit is annual all to carry out example to most voltage limiter equipment
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 failure, the voltage limiters such as the release of metal oxide pressure-limiting device pressure, cause string benefit to exit
Operation, have impact on the safe and stable operation of power network, causes the loss of transmission line capability.
The content of the invention
In order to solve the problems, such as that series compensation device metal oxide pressure-limiting device has potential faults, this hair existing for background technology
It is bright to provide a kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method and system, the leakage electricity of metal oxide pressure-limiting device
Stream only voltage limiter seriously make moist or aging in the case of can just vary widely, change when internally slightly making moist with aging
Less, measurement leakage current cannot get accurate conclusion, even and if the current in resistance property in leakage current makes moist or during aging slight
Also large change, methods described and system can be produced by the real-time monitoring to leakage current and current in resistance property, assess corresponding string
Mend device metal oxide voltage limiter and whether there is hidden danger；
A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method includes：
Step 1, the leakage current of every metal oxide pressure-limiting device is measured, measures the electric current of series compensation device main capacitor；
Step 2, the amplitude of every metal oxide pressure-limiting device leakage current and series compensation device main capacitor electric current is calculated
And phase；
Step 3, on the basis of series compensation device main capacitor electric current, calculate in every metal oxide pressure-limiting device leakage current
Current in resistance property；
Step 4, result of calculation described in step 2 and step 3 is contrasted with corresponding normal work threshold interval, confirmed
Every metal oxide pressure-limiting device working condition；
Further, leakage current and main electricity of the platform data module synchronization to every metal oxide pressure-limiting device
Condenser current samples N number of cycle, sampling interval duration T, wherein, 10≤N≤20, N are integer, 50us≤T≤100us；
Further, every metal oxide pressure-limiting device is calculated by harmonic analysis method or Fast Fourier Transform (FFT) method to let out
The amplitude and phase of leakage current and series compensation device main capacitor；
Further, the main capacitor is formed by more capacitor unit connection in series-parallel, the main capacitor it is equivalent total
Electric capacity is C∑, the equivalent total resistance of the main capacitor is R∑, then the main capacitor voltage phaseFor：
Wherein, ω is frequency,For main condenser current phase；
Further, the equivalent total capacitance C of the main capacitor∑Obtained by the more capacitor units capacitance connection in series-parallel
Go out, the capacitor unit capacitance is drawn by factory testing or field measurement；The equivalent total resistance R of the main capacitor∑By
The more capacitor units equivalent resistance connection in series-parallel show that the capacitor unit equivalent resistance is drawn by power consumption experiment, institute
It is that m capacitor unit is composed in series into capacitor unit group to state series-parallel connected mode, then n capacitor unit group is entered
Row is in parallel, and the capacitor unit is equivalent to be composed in parallel by electric capacity and equivalent resistance, and wherein m, n are natural number；
Further, the current in resistance property I in every metal oxide pressure-limiting device leakage currentR-movXFor：
IR-movX=Imov-Xcos(θX+δX)
The Imov-XFor the amplitude of X metal oxide pressure-limiting device leakage current；θXLimited for X metal oxide
The power-factor angle of depressor voltage and leakage current；δXFor the phase only pupil filter parameter of X metal oxide；The main capacitor
It is in parallel with metal oxide pressure-limiting device, the θXCalculation be：
Wherein, 1≤X≤k, X are integer, and k is metal oxide pressure-limiting device number.
Further, the leakage current of every metal oxide pressure-limiting device of the measurement uses low current sensor, described
Measurement series compensation device main capacitor uses current transformer；
Further, the leakage current of described every metal oxide pressure-limiting device of measurement and measurement main capacitor electric current are same
Walk sampled measurements；First measurement result is carried out by analog-to-digital conversion before carrying out the calculating such as step 2 and step 3 using measurement result
Pretreatment；
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 gathering 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 are used to gather 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 sensor collections of synchronized sampling
Compound voltage limiter leakage current and the series compensation device main capacitor electric current of current transformer collection, carry out analog-to-digital conversion, to each
Data carry out processing calculating, and calculation result data is sent into ground monitoring unit through optical fiber insulated column；
Optical fiber insulated column, the optical fiber insulated column are used to provide data of the platform data unit to ground monitoring unit
Transmit channel；
Ground monitoring unit, the ground monitoring unit are used for each data received and storage platform data cell is sent,
And judge series compensation device voltage limiter with the presence or absence of abnormal according to the comparative 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 is connected through low current sensor and the low-pressure end of the metal oxide pressure-limiting device busbar that confluxes；The metal oxide pressure-limiting device
The low-pressure end busbar that confluxes be connected with series compensation device low-voltage bus bar；
Further, the low current sensor is connected with current transformer by shielded cable with platform data unit；
Further, the main capacitor is formed by more capacitor unit connection in series-parallel, the main capacitor it is equivalent total
Electric capacity C∑Drawn by the more capacitor units capacitance connection in series-parallel, the capacitor unit capacitance is by factory testing or existing
Field actual measurement is drawn；The equivalent total resistance R of the main capacitor∑Drawn by the more capacitor units equivalent resistance connection in series-parallel,
The capacitor unit equivalent resistance is drawn by power consumption experiment；Series-parallel connected mode 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 electric capacity and etc.
Resistor coupled in parallel composition is imitated, wherein m, n are natural number；
Further, the platform data unit is exported and included 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.
Beneficial effects of the present invention are：Technical scheme, give a kind of series compensation device voltage limiter leakage current
On-line monitoring method and system, methods described and system propose the resistance that every voltage limiter is extracted on the basis of main capacitor electric current
Property current methods, and the real-time monitoring to leakage current and current in resistance property is passed through based on this, assesses corresponding series compensation device metal oxygen
Compound voltage limiter whether there is hidden danger；Substantially increase series compensation device and its functional reliability of metal oxide pressure-limiting device；Together
When this method and system without additionally installing voltage transformer or divider additional on series compensation platform, solving series compensation platform equipment can
With the problems such as space is small, characteristics of compact layout, small insulation margin.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is a kind of flow of series compensation device voltage limiter On-line Monitoring of Leakage Current method of the specific embodiment of the invention
Figure；
Fig. 2 is a kind of knot of series compensation device voltage limiter On-line Monitoring of Leakage Current system of the specific embodiment of the invention
Composition；
Fig. 3 is the series compensation device main capacitor electric current and metal oxide pressure-limiting device leakage electricity of the specific embodiment of the invention
Flow waveform and the schematic diagram of phase relation；
Fig. 4 is that the string of the specific embodiment of the invention mends each capacitor cell connection relationship diagram in main capacitor.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and is not limited to embodiment described herein, there is provided these embodiments are to disclose at large and fully
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that and its
The linguistic context of association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is a kind of flow of series compensation device voltage limiter On-line Monitoring of Leakage Current method of the specific embodiment of the invention
Figure；According to the method and step shown in the flow chart, the current in resistance property of every voltage limiter is extracted on the basis of main capacitor electric current
Method, and corresponding series compensation device metal oxide limit is assessed by the real-time monitoring to leakage current and current in resistance property based on this
Depressor whether there is hidden danger；
A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method includes：
Step 101, the leakage current of every metal oxide pressure-limiting device is measured, measures the electricity of series compensation device main capacitor
Stream；
The leakage current of every metal oxide pressure-limiting device of the measurement uses low current sensor, and the measurement string mends dress
Put main capacitor and use current transformer；The series compensation device includes k metal oxide pressure-limiting device, in every metal oxide
Low current sensor is installed on voltage limiter；Preferably, the low current sensor is punching structure, and metal oxide is limited
The wire that depressor bottom is drawn passes through low current sensor, and is connected with the low-pressure end of the metal oxide pressure-limiting device busbar that confluxes；
Current transformer is installed in the series compensation device main capacitor low pressure terminated line；In the present embodiment, in micro-current current sensor
Heart aperture is 30mm to 100mm；Low current sensor measurement range is 50 μ A to 100mA, maximum output voltage signal is ± 7V；
The current transformer primary side rated current takes series compensation platform rated current, and secondary output current is 1A；
Preferably, for compact layout, low current sensor is arranged on metal oxide pressure-limiting device bottom close to bus
The position of side；
The low current sensor summation current transformer is connected by shielded cable with platform data unit, the platform number
The main capacitor electric current that the leakage current and current transformer measured according to every low current sensor of unit synchronous acquisition measures,
And carry out analog-to-digital conversion；The synchronous leakage current and main capacitor electricity to every metal oxide pressure-limiting device of the synchronous acquisition
Stream samples N number of cycle, sampling interval duration T, wherein, 10≤N≤20, N are integer, 50us≤T≤100us；If N≤10,
Then data volume is too small, and computational accuracy is low；If N >=20, data volume is excessive, and then expends a large amount of hardware memory resources and calculate effect
Rate is too low；
Step 102, the width of every metal oxide pressure-limiting device leakage current and series compensation device main capacitor electric current is calculated
Value and phase；
After the completion of the collection of platform data unit, using synchronization as t0Starting point, selection one is complete in N number of cycle of sampling
Whole cycle sampled value, calculate the fundamental frequency component I of series compensation device main capacitor electric currentcapAnd phaseAnd k
The fundamental frequency component I of every voltage limiter leakage current in metal oxide pressure-limiting devicemov-1To Imov-kAnd phaseExtremelyObtain series compensation device principal current device electric current as shown in Figure 3 and metal oxide pressure-limiting device is let out
Waveform, amplitude and the phase relation of leakage current, shown waveform formula are as follows：
Wherein, k is natural number and k is less than or equal to metal oxide pressure-limiting device number；
Preferably, the amplitude and the method for phase of calculating is Fast Fourier Transform (FFT) method；
Preferably, the amplitude and the method for phase of calculating is harmonic analysis method；
Step 103, on the basis of series compensation device main capacitor electric current, every metal oxide pressure-limiting device leakage current is calculated
In current in resistance property；
As shown in figure 4, the equivalent total capacitance C of the main capacitor∑By the more capacitor units capacitance connection in series-parallel
Draw, the capacitor unit capacitance is drawn by factory testing or field measurement；The equivalent total resistance R of the main capacitor∑
Being drawn by the more capacitor units equivalent resistance connection in series-parallel, the capacitor unit equivalent resistance is drawn by power consumption experiment,
Series-parallel system by m capacitor unit as shown in figure 4, be composed in series capacitor unit group, then n capacitor unit group is entered
Row is in parallel, and it is many that the equivalent resistance includes the loss of capacitor unit inner lead, dielectric loss, parallel discharge resistance loss etc.
Component, every capacitor unit are equivalent to the circuit composed in parallel by electric capacity and equivalent resistance；Wherein m, n are natural number；
The equivalent circuit of main capacitor is mended by being gone here and there in Fig. 4 to be obtained：
Solution obtains the main capacitor voltage phaseFor：
The series compensation device main capacitor and metal oxide pressure-limiting device are connected in parallel between high voltage bus and low-voltage bus bar, therefore
The both end voltage of main capacitance is equal with metal oxide pressure-limiting device both end voltage；Then on the basis of string mends main capacitance electric current, calculate
The power-factor angle θ of every voltage limiter voltage and leakage currentkFor：
Then the current in resistance property of every metal oxide pressure-limiting device is：
IR-movk=Imov-kcos(θk+δk)
Wherein, δkFor the phase only pupil filter coefficient of k-th of metal oxide pressure-limiting device, k is natural number and k is less than or equal to metal
Oxide voltage limiter number；
Step 104, result of calculation is contrasted with corresponding normal work threshold interval, confirms every metal oxide
Voltage limiter working condition, provides assessment result；
The result of calculation includes every metal oxide leakage current Imov-k, metal oxide pressure-limiting device voltage and leakage
The power-factor angle θ of electric currentk, current in resistance property IR-movkAnd main capacitor voltage Ucap, main capacitor electric current Icap；
It is described to confirm that every metal maintenance refers to the voltage U according to main capacitor without voltage limiter working conditioncapAnd electric current
IcapDetermine voltage limiter leakage current threshold range, current in resistance property scope and power factor angular region；By every voltage limiter
Leakage current Imov-k, power-factor angle θk, current in resistance property IR-movkContrasted with threshold range, be confirmed whether to go beyond the scope, obtain
Go out assessment result.
Fig. 2 is a kind of structure of series compensation device voltage limiter On-line Monitoring of Leakage Current system of the specific embodiment of the invention
Figure；Described device gathers synchrodata by more low current sensors and current transformer, and mould is carried out through platform data unit
Number conversion and processing calculate, and obtain checkout result and are sent by optical fiber insulated column to ground monitoring unit, ground monitoring unit pair
Monitored results carry out analysis and evaluation；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 used to gather corresponding metal oxidation
Thing voltage limiter leakage current, the more low current sensor output ends are connected with platform data unit；
Current Transmit, the Current Transmit are used to gather series compensation device main capacitor electric current, and the electric current is mutual
Sensor output end is connected with platform data unit 201；
Platform data unit 201, the platform data unit 201 are used for more low current sensor collections of synchronized sampling
Metal oxide pressure-limiting device leakage current and the series compensation device main capacitor electric current of current transformer collection, carry out modulus and turn
Change, each data are carried out with processing calculating, and calculation result data is sent to ground monitoring unit 203 through optical fiber insulated column 202；
Optical fiber insulated column 202, the optical fiber insulated column 202 are used to provide the platform data unit to ground monitoring unit
203 data transfer channel；
Ground monitoring unit 203, the ground monitoring unit 203 is used to receive and storage platform data cell 201 is sent
Each data, and judge series compensation device voltage limiter with the presence or absence of different according to the comparative result of each data and normal work threshold interval
Often；
Further, the series compensation device include k number be MOV-1 to MOV-k metal oxide pressure-limiting devices, at every
Low current sensor is installed, corresponding low current sensor numbering 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 wire that metal oxide pressure-limiting device bottom is drawn passes through micro-current
Sensor, and be connected with the low-pressure end of the metal oxide pressure-limiting device busbar that confluxes；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 for ±
7V；The current transformer primary side rated current takes series compensation platform rated current, and secondary output current is 1A；
Preferably, for compact layout, low current sensor is arranged on metal oxide pressure-limiting device bottom close to bus
The position of side；
Preferably, the low current sensor is connected with current transformer by shielded cable with platform data unit；
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, the main capacitor is formed by more capacitor unit connection in series-parallel, the main capacitor it is equivalent total
Electric capacity C∑Drawn by the more capacitor units capacitance connection in series-parallel, the capacitor unit capacitance is by factory testing or existing
Field actual measurement is drawn；The equivalent total resistance R of the main capacitor∑Drawn by the more capacitor units equivalent resistance connection in series-parallel,
The capacitor unit equivalent resistance is drawn by power consumption experiment；
Further, the platform data unit is exported and included 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 essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (11)
1. a kind of series compensation device voltage limiter On-line Monitoring of Leakage Current method, methods described include：
Step 1, the leakage current of every metal oxide pressure-limiting device is measured, measures the electric current of series compensation device main capacitor；
Step 2, the amplitude and phase of every metal oxide pressure-limiting device leakage current and series compensation device main capacitor electric current are calculated
Position；
Step 3, on the basis of series compensation device main capacitor electric current, the resistance in every metal oxide pressure-limiting device leakage current is calculated
Property electric current；
Step 4, result of calculation described in step 2 and step 3 is contrasted with corresponding normal work threshold interval, confirms every
Metal oxide pressure-limiting device working condition.
2. according to the method for claim 1, it is characterised in that：The platform data module synchronization is 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.
3. according to the method for claim 1, it is characterised in that：Pass through harmonic analysis method or Fast Fourier Transform (FFT) method meter
Calculate the amplitude and phase of every metal oxide pressure-limiting device leakage current and series compensation device main capacitor.
4. the method according to claim 1 or 3, it is characterised in that：The main capacitor by more capacitor unit strings simultaneously
Connection forms, and the equivalent total capacitance of the main capacitor is C∑, the equivalent total resistance of the main capacitor is R∑, then the main capacitance
Device voltage-phaseFor：
Wherein, ω is frequency,For main condenser current phase.
5. according to the method for claim 4, it is characterised in that：In every metal oxide pressure-limiting device leakage current
Current in resistance property IR-movXFor：
IR-movX=Imov-Xcos(θX+δX)
The Imov-XFor the amplitude of X metal oxide pressure-limiting device leakage current；θXFor X metal oxide pressure-limiting device electricity
Pressure and the power-factor angle of leakage current；δXFor the phase only pupil filter parameter of X metal oxide；The main capacitor and metal
Oxide voltage limiter is in parallel, the θXCalculation be：
Wherein, 1≤X≤k, X are integer, and k is metal oxide pressure-limiting device number.
6. according to the method for claim 1, it is characterised in that：The leakage electricity of described every metal oxide pressure-limiting device of measurement
Stream uses low current sensor, and the measurement series compensation device main capacitor uses current transformer.
7. according to the method for claim 1, it is characterised in that：The leakage electricity of described every metal oxide pressure-limiting device of measurement
Stream and measurement main capacitor electric current measure for synchronized sampling；First will before carrying out the calculating such as step 2 and step 3 using measurement result
Measurement result is pre-processed by analog-to-digital conversion.
8. a kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system, the system include：
More low current sensors, the more low current sensors are used to gather 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 are used to gather 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 sensor collections of synchronized sampling
Voltage limiter leakage current and the series compensation device main capacitor electric current of current transformer collection, 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 optical fiber insulated column are used to provide data transfer of the platform data unit to ground monitoring unit
Channel；
Ground monitoring unit, the ground monitoring unit are used for each data received and storage platform data cell is sent, and root
Judge series compensation device voltage limiter with the presence or absence of abnormal according to the comparative result of each data and normal work threshold interval.
9. system according to claim 8, it is characterised in that：The low current sensor is punching structure, the gold
Category oxide voltage limiter bottom extraction wire is confluxed busbar through the low-pressure end of low current sensor and metal oxide pressure-limiting device
It is connected；The low-pressure end of the metal oxide pressure-limiting device busbar that confluxes is connected with series compensation device low-voltage bus bar.
10. system according to claim 8, it is characterised in that：The low current sensor passes through screen with current transformer
Cable is covered with platform data unit to be connected.
11. system according to claim 8, it is characterised in that：The platform data unit, which exports, gives ground monitoring unit
Data include：Every metal oxide pressure-limiting device leakage current values, main capacitor voltage value, main capacitor current value, every
The current in resistance property of metal oxide pressure-limiting device voltage and the power-factor angle of leakage current and every metal oxide pressure-limiting device
Value.
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| CN107525996B CN107525996B (en) | 2024-04-30 |
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| CN (1) | CN107525996B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899993A (en) * | 2018-05-09 | 2018-11-27 | 北京国网普瑞特高压输电技术有限公司 | Voltage limiter status monitoring subsystem based on series compensation state on_line monitoring system |
| CN109061275A (en) * | 2018-05-23 | 2018-12-21 | 中国电力科学研究院有限公司 | A kind of distributed On-line Monitoring of Leakage Current method and system of series compensation device voltage limiter |
| CN109742727A (en) * | 2018-12-21 | 2019-05-10 | 国网湖南省电力有限公司 | A kind of judgment method of low pressure 400V leakage current |
| CN112081586A (en) * | 2020-10-10 | 2020-12-15 | 中国石油天然气集团有限公司 | Multi-spectrum stratum boundary far detection method and device |
| CN113466600A (en) * | 2021-08-03 | 2021-10-01 | 国网四川省电力公司营销服务中心 | Circuit, method and use for detecting the effect of leakage current on a current transformer |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060020406A1 (en) * | 2001-10-04 | 2006-01-26 | Hitachi, Ltd. | Leakage current or resistance measurement method, and monitoring apparatus and monitoring system of the same |
| CN102790387A (en) * | 2012-07-31 | 2012-11-21 | 许继集团有限公司 | Protection device and series compensation system for metal oxide varistor in series compensation |
| CN102955089A (en) * | 2012-11-16 | 2013-03-06 | 四川电力科学研究院 | Online monitoring device applied to voltage limiter in series compensation capacitor and method thereof |
| CN103001235A (en) * | 2012-11-13 | 2013-03-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for evaluating risks of MOV (metal oxide varistor) of series capacitive compensator |
| CN203012039U (en) * | 2012-11-16 | 2013-06-19 | 四川电力科学研究院 | Online monitoring device for voltage limiter in series compensation capacitor |
| CN103728481A (en) * | 2013-12-30 | 2014-04-16 | 国家电网公司 | Method and device for detecting metal oxide arrester resistive current |
| CN104330615A (en) * | 2014-10-31 | 2015-02-04 | 南京世都科技有限公司 | Multi-phase measuring device of lightning arrester and transformer based on FFT algorithm and method thereof |
| CN104808050A (en) * | 2015-05-26 | 2015-07-29 | 南京信息工程大学 | Method and device for monitoring resistive current of voltage-limiting type surge protection device on line |
| WO2017016361A1 (en) * | 2015-07-29 | 2017-02-02 | 王富元 | Online monitoring method for resistive leakage current of metal-oxide-varistor lightning arrester or surge protection device |
| CN207689556U (en) * | 2017-08-25 | 2018-08-03 | 中国电力科学研究院 | A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system |
-
2017
- 2017-08-25 CN CN201710742640.3A patent/CN107525996B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060020406A1 (en) * | 2001-10-04 | 2006-01-26 | Hitachi, Ltd. | Leakage current or resistance measurement method, and monitoring apparatus and monitoring system of the same |
| CN102790387A (en) * | 2012-07-31 | 2012-11-21 | 许继集团有限公司 | Protection device and series compensation system for metal oxide varistor in series compensation |
| CN103001235A (en) * | 2012-11-13 | 2013-03-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for evaluating risks of MOV (metal oxide varistor) of series capacitive compensator |
| CN102955089A (en) * | 2012-11-16 | 2013-03-06 | 四川电力科学研究院 | Online monitoring device applied to voltage limiter in series compensation capacitor and method thereof |
| CN203012039U (en) * | 2012-11-16 | 2013-06-19 | 四川电力科学研究院 | Online monitoring device for voltage limiter in series compensation capacitor |
| CN103728481A (en) * | 2013-12-30 | 2014-04-16 | 国家电网公司 | Method and device for detecting metal oxide arrester resistive current |
| CN104330615A (en) * | 2014-10-31 | 2015-02-04 | 南京世都科技有限公司 | Multi-phase measuring device of lightning arrester and transformer based on FFT algorithm and method thereof |
| CN104808050A (en) * | 2015-05-26 | 2015-07-29 | 南京信息工程大学 | Method and device for monitoring resistive current of voltage-limiting type surge protection device on line |
| WO2017016361A1 (en) * | 2015-07-29 | 2017-02-02 | 王富元 | Online monitoring method for resistive leakage current of metal-oxide-varistor lightning arrester or surge protection device |
| CN207689556U (en) * | 2017-08-25 | 2018-08-03 | 中国电力科学研究院 | A kind of series compensation device voltage limiter On-line Monitoring of Leakage Current system |
Non-Patent Citations (4)
| Title |
|---|
| 吕健双;文远芳;文康珍;刘凯;胡建勋;: "单片绝缘子泄漏电流阻容分量研究", 水电能源科学, no. 05 * |
| 李国富;刘之方;高克利;来小康;宋继军;董勤晓;张翠霞;林毅;: "一种金属氧化物限压器动作电流不平衡度的预测算法", 电力设备, no. 11 * |
| 祝铭;邹彬;万善良;毕毓良;: "采用测量阻性电流提高MOA状态监测的可行性研究", 电瓷避雷器, no. 06 * |
| 郑铁;任璐;王润涛;武云鹏;: "一种串补MOV直流泄漏电流试验方式的改进", 科技创新导报, no. 05 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899993A (en) * | 2018-05-09 | 2018-11-27 | 北京国网普瑞特高压输电技术有限公司 | Voltage limiter status monitoring subsystem based on series compensation state on_line monitoring system |
| CN109061275A (en) * | 2018-05-23 | 2018-12-21 | 中国电力科学研究院有限公司 | A kind of distributed On-line Monitoring of Leakage Current method and system of series compensation device voltage limiter |
| CN109742727A (en) * | 2018-12-21 | 2019-05-10 | 国网湖南省电力有限公司 | A kind of judgment method of low pressure 400V leakage current |
| CN109742727B (en) * | 2018-12-21 | 2020-03-17 | 国网湖南省电力有限公司 | Method for judging low-voltage 400V leakage current |
| CN112081586A (en) * | 2020-10-10 | 2020-12-15 | 中国石油天然气集团有限公司 | Multi-spectrum stratum boundary far detection method and device |
| CN112081586B (en) * | 2020-10-10 | 2024-04-30 | 中国石油天然气集团有限公司 | Multi-spectrum stratum boundary far detection method and device |
| CN113466600A (en) * | 2021-08-03 | 2021-10-01 | 国网四川省电力公司营销服务中心 | Circuit, method and use for detecting the effect of leakage current on a current transformer |
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