CN108919075A - High-tension switch cabinet partial discharge monitoring method for early warning - Google Patents
High-tension switch cabinet partial discharge monitoring method for early warning Download PDFInfo
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- CN108919075A CN108919075A CN201810877442.2A CN201810877442A CN108919075A CN 108919075 A CN108919075 A CN 108919075A CN 201810877442 A CN201810877442 A CN 201810877442A CN 108919075 A CN108919075 A CN 108919075A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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Abstract
The invention discloses a kind of high-tension switch cabinet partial discharge monitoring method for early warning, this method detects the transient state voltage-to-ground of high-tension switch cabinet difference test position using transient earth voltage method and calculates average value；According to the offset of the test value of different test positions and mean value calculation test value, the grade and countermeasure of high-tension switch cabinet shelf depreciation are divided according to offset and average value；Test twice is carried out to high-tension switch cabinet and obtains transient state voltage-to-ground average value A1 and A2, and calculate the offset of transient state voltage-to-ground average value twice, when the offset seriously becomes larger, high-tension switch cabinet is included in danger classes and has a power failure, and positions Partial Discharge Sources position and is overhauled.This method overcomes the defect of conventional high-tension partial discharge of switchgear monitoring mode, comprehensive analysis judgement is carried out using Partial Discharge Detection data, reach the accurate division to operation high-tension switch cabinet danger classes, and early warning is carried out on the shelf depreciation that may influence high-tension switch cabinet operational safety.
Description
Technical field
The present invention relates to a kind of high-tension switch cabinet partial discharge monitoring method for early warning.
Background technique
During the conversion of the power generation of power supply system, transmission of electricity, distribution and electric energy, the effect of high-tension switch cabinet is to power supply
Route carries out division, control and protection, therefore high-tension switch cabinet reliability of operation is particularly significant.High-tension switch cabinet is being run
In the process due to by high temperature, high pressure, vibration and other chemical actions, it will so that its insulation performance reduces, generate part
Electric discharge phenomena, the presence of shelf depreciation can accelerate insulation aging, the important symbol of insulation degradation be exactly local discharging level not
Disconnected enhancing.The cumulative effect that shelf depreciation generates can make the dielectric properties of insulation gradually degrade and expand local defect, finally
Lead to entire insulation breakdown.High-tension switch cabinet can cause biggish economic damage once Fault of Insulating Breakdown occurs to electric system
It loses, therefore the shelf depreciation inside high-tension switch cabinet is monitored and early warning is of great significance.
Shelf depreciation inside high-tension switch cabinet is that the electric field strength generated in high-voltage switch gear due to applied voltage is enough
Partial region between electrode is set to discharge, but the electric discharge phenomena of not formed fixed discharge channel, power equipment are exhausted between the electrodes
The electric discharge that edge medium occurs in subrange under sufficiently strong electric field action is known as shelf depreciation.Shelf depreciation is likely to occur in
Between insulating layer in the hole of solid insulation, in the bubble of fluid insulation, with different characteristics and metal (or semiconductor)
At the sharp edges of electrode.
Any type of non-through electric discharge is shelf depreciation, and main Types include：It is led by metal surface burr, high pressure
There is Point Corona Discharge caused by tip corona etc. in bar or switch electrode；The mainly creeping discharge as caused by dirty along face；It is main
It will the bubble-discharge as caused by insulating sleeve or porcelain vase ontology inside crack air gap；By free-moving metallic particles or fastener
Floating potential discharge caused by loosening.
Under normal conditions since the breakdown field strength of gas is more much lower than solid dielectric, the electric field in gas compares solid again
It is high in medium, therefore often shelf depreciation is generated at the position of air gap.Although shelf depreciation inside high-voltage switch gear is only limitted to office
Portion's range, but shelf depreciation can all have certain influence to dielectric each time, will result in this way dielectric insulating strength by
Gradually decline.General slight shelf depreciation is smaller on dielectric influence, and the decline process of dielectric strength is slower；And strong
Shelf depreciation is affected to dielectric, and dielectric strength declines quickly, this is an important factor for causing high-voltage isulation to damage.
Therefore, running high-tension switch cabinet need to be reinforced monitoring, does not allow that stronger part occurs in insulation system
Electric discharge should be out of service by equipment when being locally discharged beyond to a certain degree, carries out overhaul of the equipments or replacement.
Other than conventional offline preventive trial is to the monitoring of high-tension switch cabinet insulation degradation, in high-tension switch cabinet
The on-line monitoring of shelf depreciation mainly uses following three kinds of technological means：
Supercritical ultrasonics technology：It is detected using ultrasonic detection technology inside high-tension switch cabinet with the presence or absence of shelf depreciation and electric discharge
Intensity, this method is fairly simple, and tested person environmental condition does not limit, but sensitivity is lower, cannot be directly quantitative to shelf depreciation；
The advantages of supercritical ultrasonics technology is that it can accurately be surveyed in the uncharged any part placement sensor of high-voltage switch gear case surface
Determine discharge position, and received signal with operation power supply in high-tension switch cabinet is not electric contacts, not will receive system power supply
Electric signal interference.
Transient earth voltage method：Shelf depreciation will cause alternating electric field and magnetic field when shelf depreciation occurring in high-tension switch cabinet
Mutually excitation, electromagnetic wave is transferred to switchgear surface by cabinet parietal suture gap and induces electric current, and transient earth voltage method is mostly at present
Induced current is detected using capacitive coupling detector, to monitor shelf depreciation.
Hyperfrequency method：Shelf depreciation frequency is 300~3000MHz in general high voltage switchgear, when pulse rises lasting
Between be nanosecond, hyperfrequency method using be arranged in inside high-tension switch cabinet ultra-high frequency antenna reception electromagnetic wave signal detected
And analysis, judge fault type and fault location；The electromagnetic wave signal that shelf depreciation generates is detected in uhf-range, it can be with
Exclude external interference signal, therefore hyperfrequency method has many advantages, such as that anti-electromagnetic interference capability is strong, high sensitivity, bandwidth, and closely
It is quickly grown over year, valid analysing range is wide, and what signal included contains much information, and the sensor monitoring point of installation is less, detection
Efficiency is relatively high.
Facts have proved three of the above method all is the effective ways for monitoring high-tension switch cabinet shelf depreciation, is capable of detecting when height
Cabinet inside compress switch with the presence or absence of shelf depreciation and relative magnitude size, but diagnoses whether shelf depreciation inside high-tension switch cabinet is sent out
It is still the field for being worth research that opening up, which influences the degree of high-tension switch cabinet operational safety,.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of high-tension switch cabinet partial discharge monitoring method for early warning, we
Method overcomes the defect of conventional high-tension partial discharge of switchgear monitoring mode, carries out comprehensive analysis using Partial Discharge Detection data and sentences
It is fixed, reach the accurate division to operation high-tension switch cabinet danger classes, and on the office that may influence high-tension switch cabinet operational safety
Portion's electric discharge carries out early warning.
In order to solve the above technical problems, high-tension switch cabinet partial discharge monitoring method for early warning of the present invention includes the following steps：
Step 1: using the transient state voltage-to-ground of transient earth voltage method detection high-tension switch cabinet difference test position, and lead to
It crosses formula (1) and calculates transient state voltage-to-ground average value,
In formula：A is transient state voltage-to-ground average value, TiIt is surveyed for the transient state voltage-to-ground of high-tension switch cabinet difference test position
Examination value, n are total test position quantity；
Step 2: carry out horizontal analysis to shelf depreciation, according to the test value of high-tension switch cabinet difference test position and
The offset of transient state voltage-to-ground mean value calculation test value,
In formula：Δ m is the offset of test value, judges whether average value A is greater than 20dB, as average value A<When 20dB, according to
High-tension switch cabinet shelf depreciation grade is provided according to offset Δ m to determine：
Δ m≤100%, high-tension switch cabinet is normal, can run, and is detected by normal detection cycle；
100% < Δ m≤150%, high-tension switch cabinet is abnormal, needs to pay close attention to, and detection cycle shorten to half；
150% < Δ m≤200%, high-tension switch cabinet is abnormal, provides early warning, positions Partial Discharge Sources position, and
Detection cycle shorten to a quarter；
Δ m > 200%, high-tension switch cabinet is dangerous, needs to have a power failure, and positions Partial Discharge Sources position and is overhauled；
Step 3: carrying out definite value differentiation to shelf depreciation, as average value A > 20dB, height is provided according to average value A and is pressed off
Cabinet shelf depreciation grade is closed to determine：
20 < A≤25dB, high-tension switch cabinet is normal, can run, and is detected by normal detection cycle；
25 < A≤40dB, high-tension switch cabinet is abnormal, needs to pay close attention to, and detection cycle shorten to half；
40 < A≤55dB, high-tension switch cabinet is abnormal, provides early warning, positions Partial Discharge Sources position, and detect week
Phase shorten to a quarter；
A > 55dB, high-tension switch cabinet is dangerous, needs to have a power failure, and positions Partial Discharge Sources position and is overhauled；
Step 4: carrying out vertical analysis to shelf depreciation, successive two are carried out to high-tension switch cabinet using transient earth voltage method
Secondary test obtains transient state voltage-to-ground average value A1 and A2, the offset of transient state voltage-to-ground average value is calculated as follows：
In formula：Δ q is offset, as Δ q>When 50%, i.e., the transient state voltage-to-ground average value difference tested twice is serious
Become larger, after exclusive PCR factor, high-tension switch cabinet is included in danger classes and has a power failure, and positioning Partial Discharge Sources position is gone forward side by side
Row maintenance.
Further, the transient state voltage-to-ground average value A1 successively tested twice is carried out to high-tension switch cabinet in step 4
With in A2 do not include normal transient state voltage-to-ground value.
Since high-tension switch cabinet partial discharge monitoring method for early warning of the present invention uses above-mentioned technical proposal, i.e. this method is adopted
The transient state voltage-to-ground of high-tension switch cabinet difference test position is detected with transient earth voltage method and calculates average value；According to different surveys
The test value at position and the offset of mean value calculation test value are tried, high-tension switch cabinet is divided according to offset and average value
The grade and countermeasure of shelf depreciation；To high-tension switch cabinet carry out twice test obtain transient state voltage-to-ground average value A1 and
A2, and the offset of transient state voltage-to-ground average value twice is calculated, when the offset seriously becomes larger, high-tension switch cabinet is included in danger
Dangerous grade simultaneously has a power failure, and positions Partial Discharge Sources position and is overhauled.This method overcomes conventional high-tension switchgear locally to put
The defect of pyroelectric monitor mode carries out comprehensive analysis judgement using Partial Discharge Detection data, reaches to operation high-tension switch cabinet danger
The accurate division of dangerous grade, and early warning is carried out on the shelf depreciation that may influence high-tension switch cabinet operational safety.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and embodiments：
Fig. 1 is high-tension switch cabinet partial discharge monitoring method for early warning flow chart of the present invention.
Specific embodiment
Embodiment is as shown in Figure 1, high-tension switch cabinet partial discharge monitoring method for early warning of the present invention includes the following steps：
Step 1: using the transient state voltage-to-ground of transient earth voltage method detection high-tension switch cabinet difference test position, and lead to
It crosses formula (1) and calculates transient state voltage-to-ground average value,
In formula：A is transient state voltage-to-ground average value, TiIt is surveyed for the transient state voltage-to-ground of high-tension switch cabinet difference test position
Examination value, n are total test position quantity；
Step 2: carry out horizontal analysis to shelf depreciation, according to the test value of high-tension switch cabinet difference test position and
The offset of transient state voltage-to-ground mean value calculation test value,
In formula：Δ m is the offset of test value, judges whether average value A is greater than 20dB, as average value A<When 20dB, according to
High-tension switch cabinet shelf depreciation grade is provided according to offset Δ m to determine：
Δ m≤100%, high-tension switch cabinet is normal, can run, and is detected by normal detection cycle；
100% < Δ m≤150%, high-tension switch cabinet is abnormal, needs to pay close attention to, and detection cycle shorten to half；
150% < Δ m≤200%, high-tension switch cabinet is abnormal, provides early warning, positions Partial Discharge Sources position, and
Detection cycle shorten to a quarter；
Δ m > 200%, high-tension switch cabinet is dangerous, needs to have a power failure, and positions Partial Discharge Sources position and is overhauled；
Since in transient earth voltage method detection shelf depreciation, the value range of voltage value is larger, difference hundreds of thousands times, temporarily
After state voltage-to-ground average value is calculated with 20lgV, the value range of dB value is relatively more intuitive between -20~60, the art
Partial discharge intensity is indicated with dB value, this method is divided with partial discharge intensity 20dB；
Step 3: carrying out definite value differentiation to shelf depreciation, as average value A > 20dB, height is provided according to average value A and is pressed off
Cabinet shelf depreciation grade is closed to determine：
20 < A≤25dB, high-tension switch cabinet is normal, can run, and is detected by normal detection cycle；
25 < A≤40dB, high-tension switch cabinet is abnormal, needs to pay close attention to, and detection cycle shorten to half；
40 < A≤55dB, high-tension switch cabinet is abnormal, provides early warning, positions Partial Discharge Sources position, and detect week
Phase shorten to a quarter；
A > 55dB, high-tension switch cabinet is dangerous, needs to have a power failure, and positions Partial Discharge Sources position and is overhauled；
Step 4: carrying out vertical analysis to shelf depreciation, successive two are carried out to high-tension switch cabinet using transient earth voltage method
Secondary test obtains transient state voltage-to-ground average value A1 and A2, the offset of transient state voltage-to-ground average value is calculated as follows：
In formula：Δ q is offset, as Δ q>When 50%, i.e., the transient state voltage-to-ground average value difference tested twice is serious
Become larger, after exclusive PCR factor, high-tension switch cabinet is included in danger classes and has a power failure, and positioning Partial Discharge Sources position is gone forward side by side
Row maintenance.
Preferably, the transient state voltage-to-ground average value A1 successively tested twice is carried out to high-tension switch cabinet in step 4
With in A2 do not include normal transient state voltage-to-ground value.
This method detects high-tension switch cabinet difference test position using transient earth voltage method, to the part detected
Discharge data makees horizontal analysis after being handled, definite value differentiates and vertical analysis, horizontal analysis are exactly to same high-tension switch cabinet
A same test result for all high-voltage switch gears of interior same voltage class is compared, when a certain or certain several high-voltage switch gear
When test result is bigger than the test result of other high-voltage switch gears, so that it may judge the possibility of the high-tension switch cabinet existing defects
Property；Definite value distinguishing rule transient state voltage-to-ground average value divides high-tension switch cabinet shelf depreciation grade and determines；Vertical analysis is pair
The test result of different time is analyzed, and show that the trend analysis of high-tension switch cabinet shelf depreciation, vertical analysis are only used for different
Regular data shortens comparative analysis when detection cycle, and normal data is not included in vertical analysis.
Differentiated by horizontal analysis, definite value and vertical analysis provides high-tension switch cabinet shelf depreciation warning grade, height presses off
The warning grade of pass cabinet shelf depreciation is according to the analyzing and diagnosing process of setting to shelf depreciation inside the high-tension switch cabinet detected
Measured value is classified, so that the shelf depreciation degree inside high-tension switch cabinet is divided by the degree that insulation breakdown may occur
Normally, exception, early warning and dangerous four grades, to realize whether shelf depreciation develops to influence inside diagnosis high-tension switch cabinet
The degree of high-tension switch cabinet operational safety.
This method is the diagnostic analysis tool of high-tension switch cabinet measurement of partial discharge value monitoring, can be effectively sharp using this method
With measurement of partial discharge value detected, equipment management personnel is made clearly to know that shelf depreciation is to insulation in high-tension switch cabinet
Influence degree or the risk that discharge fault occurs, to ensure normal, the reliability service of high-tension switch cabinet.
Claims (2)
1. a kind of high-tension switch cabinet partial discharge monitoring method for early warning, it is characterised in that this method includes the following steps：
Step 1: using the transient state voltage-to-ground of transient earth voltage method detection high-tension switch cabinet difference test position, and pass through formula
(1) transient state voltage-to-ground average value is calculated,
In formula：A is transient state voltage-to-ground average value, TiFor high-tension switch cabinet difference test position transient state voltage-to-ground test value,
N is total test position quantity；
Step 2: horizontal analysis is carried out to shelf depreciation, according to the test value and transient state of high-tension switch cabinet difference test position
The offset of voltage-to-ground mean value calculation test value,
In formula：Δ m is the offset of test value, judges whether average value A is greater than 20dB, as average value A<When 20dB, according to partially
Shifting amount Δ m provides the judgement of high-tension switch cabinet shelf depreciation grade：
Δ m≤100%, high-tension switch cabinet is normal, can run, and is detected by normal detection cycle；
100% < Δ m≤150%, high-tension switch cabinet is abnormal, needs to pay close attention to, and detection cycle shorten to half；
150% < Δ m≤200%, high-tension switch cabinet is abnormal, provides early warning, positions Partial Discharge Sources position, and detect
Cycle time is a quarter；
Δ m > 200%, high-tension switch cabinet is dangerous, needs to have a power failure, and positions Partial Discharge Sources position and is overhauled；
Step 3: carrying out definite value differentiation to shelf depreciation, as average value A > 20dB, high-tension switch cabinet is provided according to average value A
Shelf depreciation grade determines：
20 < A≤25dB, high-tension switch cabinet is normal, can run, and is detected by normal detection cycle；
25 < A≤40dB, high-tension switch cabinet is abnormal, needs to pay close attention to, and detection cycle shorten to half；
40 < A≤55dB, high-tension switch cabinet is abnormal, provides early warning, positions Partial Discharge Sources position, and detection cycle contracts
Short is a quarter；
A > 55dB, high-tension switch cabinet is dangerous, needs to have a power failure, and positions Partial Discharge Sources position and is overhauled；
Step 4: carrying out vertical analysis to shelf depreciation, high-tension switch cabinet progress is successively surveyed twice using transient earth voltage method
Examination, obtains transient state voltage-to-ground average value A1 and A2, the offset of transient state voltage-to-ground average value is calculated as follows：
In formula：Δ q is offset, as Δ q>When 50%, i.e., the transient state voltage-to-ground average value difference tested twice seriously becomes larger,
After exclusive PCR factor, high-tension switch cabinet is included in danger classes and has a power failure, and positions Partial Discharge Sources position and is examined
It repairs.
2. high-tension switch cabinet partial discharge monitoring method for early warning according to claim 1, it is characterised in that：It is right in step 4
High-tension switch cabinet carries out not including normal transient state pair in the transient state voltage-to-ground average value A1 and A2 that successively test twice
Ground voltage value.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389287A (en) * | 2019-07-26 | 2019-10-29 | 云南电力试验研究院(集团)有限公司 | A kind of method for early warning and system of the electric discharge of high-tension switch cabinet interior insulation |
| CN111812459A (en) * | 2020-06-02 | 2020-10-23 | 深圳供电局有限公司 | Simulation test system applied to switch cabinet partial discharge live detection |
| CN112505501A (en) * | 2020-11-20 | 2021-03-16 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Partial discharge severity grade judging and early warning method based on electroacoustic combination |
| CN112763875A (en) * | 2020-12-30 | 2021-05-07 | 广东电网有限责任公司电力科学研究院 | Method and system for monitoring local discharge amount in gas insulated switchgear |
| CN113291350A (en) * | 2021-04-12 | 2021-08-24 | 中车唐山机车车辆有限公司 | EMUs high-pressure tank early warning device and EMUs that discharges |
| CN114325257A (en) * | 2021-11-29 | 2022-04-12 | 国网河北省电力有限公司电力科学研究院 | Self-adaptive adjustment method and monitoring system for data acquisition of partial discharge sensor of transformer |
| CN115240380A (en) * | 2022-07-20 | 2022-10-25 | 江苏方天电力技术有限公司 | Comprehensive fault early warning method and system for power grid phase modulator |
| CN116026403A (en) * | 2022-11-09 | 2023-04-28 | 国能四川西部能源股份有限公司 | Switch cabinet fault early warning method and device, medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389287A (en) * | 2019-07-26 | 2019-10-29 | 云南电力试验研究院(集团)有限公司 | A kind of method for early warning and system of the electric discharge of high-tension switch cabinet interior insulation |
| CN111812459A (en) * | 2020-06-02 | 2020-10-23 | 深圳供电局有限公司 | Simulation test system applied to switch cabinet partial discharge live detection |
| CN112505501A (en) * | 2020-11-20 | 2021-03-16 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Partial discharge severity grade judging and early warning method based on electroacoustic combination |
| CN112505501B (en) * | 2020-11-20 | 2022-07-26 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Partial discharge severity grade judging and early warning method based on electroacoustic combination |
| CN112763875A (en) * | 2020-12-30 | 2021-05-07 | 广东电网有限责任公司电力科学研究院 | Method and system for monitoring local discharge amount in gas insulated switchgear |
| CN113291350A (en) * | 2021-04-12 | 2021-08-24 | 中车唐山机车车辆有限公司 | EMUs high-pressure tank early warning device and EMUs that discharges |
| CN114325257A (en) * | 2021-11-29 | 2022-04-12 | 国网河北省电力有限公司电力科学研究院 | Self-adaptive adjustment method and monitoring system for data acquisition of partial discharge sensor of transformer |
| CN115240380A (en) * | 2022-07-20 | 2022-10-25 | 江苏方天电力技术有限公司 | Comprehensive fault early warning method and system for power grid phase modulator |
| CN116026403A (en) * | 2022-11-09 | 2023-04-28 | 国能四川西部能源股份有限公司 | Switch cabinet fault early warning method and device, medium and electronic equipment |
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