CN105891684A - Gas insulated switchgear insulation state evaluation index system construction method - Google Patents

Abstract

The invention belongs to the technical field of gas insulated switchgear insulation state on-line monitoring and evaluation, and specifically relates to a gas insulated switchgear insulation state evaluation index system construction method. A GIS state evaluation index system is mainly formed by three types of insulation state indexes: PD electrical parameters f1={e11, e12, e13, e14, e15, e16, e17, e18, e19}, PD chemical parameters f2={e21, e22, e23, e24, e25, e26 }, and characteristic parameters f3={e31, e32, e33} based on GIS device preventive test, which show the insulation state of a GIS. The constructed index system is based on insulation physical essence and statistics of experiment phenomena data information so as to meet the requirements for being brief and not lacking of key information, comprehensive but not cumbersome, and giving consideration for both whole and part and the like to the greatest extent, thereby establishing a feasible and scientific system for further establishing an insulation evaluation model. The most-representative state parameters are selected to describe the insulation state and change development tendency thereof, and the method provides a foundation for development and research of state evaluation and fault diagnosis technique of an SF6 gas insulated switchgear.

Description

A kind of gas insulated combined electrical equipment Condition assessment of insulation index system construction method

Technical field

The invention belongs to state of insulation on-line monitoring and the assessment technology field of gas insulated combined electrical equipment, be specifically related to gas Body insulation in combined electric appliance Condition assessment of insulation index system establishment scheme.

Background technology

With sulfur hexafluoride gas (SF₆) as insulation and the SF of arc-extinguishing medium₆Gas insulated combined electrical equipment (Gas Insulated Switchgear, is called for short GIS), high with its reliability, maintenance is little, floor space is little, flexible configuration, insulation The advantage such as functional develops rapidly, fills in a large number at China's network system extra-lnigh tension and ultra-high/extra-high voltage field at GIS in recent years Joining, it has been increasingly becoming the power transmission and transformation equipment of equal importance with transformator.GIS is generally considered few maintenance always and even exempts from The High-Voltage Electrical Appliances equipment safeguarded, but according to the statistics of international bulk power grid committee (CIGRE), its fault rate is marked far above IEC The fault level of quasi-suggestion.Adding up according to domestic GIS service data, insulation fault is for causing main cause in GIS fault, and insulate Being GIS device or even the most important ingredient of all power equipments, the time of day that correct assessment is apparatus insulated, is further Realize the premise of insulation tube arrester, be also to ensure that one of key of GIS device reliability.

GIS device state estimation refers to the actual motion state current according to equipment, and bonding apparatus essential history information is right The overall merit that the health status that equipment is presently in is implemented.The evaluation index of reaction GIS state of insulation is numerous, comprises not homonymy The influence factor in face, under same factor, assessment result influence degree is differed by different characteristic parameter, shelf depreciation (Partial Discharge, PD) Monitoring Data is the core information of real time reaction GIS minor insulation state, but equipment of also can not ignore is transported Row data, family's defect history, preventive trial data etc. characterize the historical information of state of insulation, are only building comprehensive shape On state Information base, it is only possible to realize the correct assessment of GIS device state of insulation.

At present, the research in the Condition assessment of insulation field equipped in power transmission and transformation both at home and abroad focuses primarily upon transformator, cable Deng equipment, as Patent No. ZL200810233096.0 " oil paper insulation ageing state based on local discharge characteristic parameter is commented Estimate method ", " the power cable with cross-linked polyethylene insulation state of insulation on-line monitoring side of Patent No. ZL200610041888.9 Method " etc., and the state of insulation field equipped for gas-insulated is mainly concentrated and is concentrated on line monitoring method, such as Patent No. " high-frequency local discharging discharge capacity monitoring acquisition method, device and the system " of ZL201010157377.X, Patent No. " sulfur hexafluoride discharge decomposition components analyzes system and using method thereof " of ZL2007100784930, does not provide for GIS's The research of the comprehensive index system that state of insulation is estimated, and only building on comprehensive status information basis, The correct assessment of GIS device state of insulation may be realized.

GIS device electrical equipment is various and structure is complicated, and built-in electrical insulation defect kind is various, and development of defects mechanism is the completeest Kind；The sign quantity of state of insulation fault is numerous, and has uncertainty and ambiguity between status information；And existing detection technique water Flat and environmental factors hinders the real-time acquisition of a large amount of status informations in fortune GIS device enclosed construction, and these are all to realize GIS The difficult point place of apparatus insulated state accurate evaluation, is also one of major reason hindering Condition-Based Maintenance Technology development and popularization. If it is possible to the comprehensive index system being estimated based on GIS state of insulation, the early stage of latency insulation fault is levied Million identify, and its state of insulation is made accurately judgement, will can arrange most preferably to keep in repair meter in GIS device before breaking down Draw, it is to avoid fault causes bigger economic loss.

Summary of the invention

It is an object of the invention to the state of insulation on-line monitoring for existing gas insulated combined electrical equipment and assessment technology neck Territory, it is provided that the comprehensive index system that the state of insulation of a set of GIS is estimated.The index system that the present invention builds is tried one's best many In terms of the mechanism of induced malfunction, choose the most close state index of contact, and comprehensively analyze and excellent from existing measurement technical standpoint Select detectable state index, this system be based on insulation physical essence and the statistical basis to experimental phenomena data message on , accomplish succinctly the most not only to have no lack of key message, comprehensive but also unlikely tediously long, overall a series of requirements such as take into account with level as far as possible, for One progressive insulation assessment models of setting up provides the index system of feasible science again.

The technical scheme is that

A kind of gas insulated combined electrical equipment Condition assessment of insulation index system construction method, it is characterised in that including:

Choose PD electric parameter f for one₁={ e₁₁, e₁₂, e₁₃, e₁₄, e₁₅, e₁₆, e₁₇, e₁₈, e₁₉State of insulation index son Step:

Step 1.1, extraction pulse amplitude correlation behavior parameter e₁₁、e₁₂、e₁₃；Wherein, e₁₁: N_mag,Electric discharge for the front/rear cycleThe total degree of superposition reflects front/rear periodic discharging weight Multiple rate,；e₁₂: E_mag,WhereinThe half wave amplitude average for the front/rear cycle is anti- Reflect strength of discharge, byObtain；e₁₃: S_mag,Amplitude standard Difference, whereinThe half wave amplitude standard deviation for the front/rear cycle reflects the change of front/rear periodic discharging pulse amplitude, ByWithObtain；

Step 1.2, it is extracted the state parameter e that time interval is relevant₁₄、e₁₅、e₁₆；Wherein, e₁₄: E_int,InFor the maximum in the average of front/rear time-of-week interval, describe double electric discharge Time interval, byCalculate；e₁₅: N_int,InFor The time interval superposition sum in front/rear cycle, describes discharge pulse sequence time duration；e₁₆: S_int,In takeThe time interval standard deviation maximum in front/rear cycle, describes time interval Change, byWithObtain；

Step 1.3, it is extracted the state parameter e that discharge range is relevant₁₇、e₁₈、e₁₉；Wherein, e₁₇: Δ T_min,Characterize electric discharge interval feature；e₁₈: P,Characterize the polarity of PD Feature；e₁₉: N_ref,Characterize the polar character of PD, power frequency period be averagely divided into 20 subintervals, For the judgement whether discharged, more than or equal to 3 times and whether above electric discharge is as being the decision criteria discharged in each interval, Thus the total discharge range to the front/rear cycle Add up；

One is extracted PD chemical parameters f₂={ e₂₁, e₂₂, e₂₃, e₂₄, e₂₅, e₂₆State of insulation index sub-step: based on SF₆Gas component Basic Experiment Study, characterizes the PD chemical feature parameter f of state of insulation₂Gas component is carried out with gas chromatograph Measure and analyze the SF obtained₆The four kinds of typical CF of characteristic gas decomposed₄、CO₂、SO₂F₂、SOF₂Content, decomposition rate, content Ratio characterizes degree of discharge, specifically includes:

Step 2.1, extraction sulfur-bearing analyte decompose total amount state parameter e₂₁, using all sulfur compound sums as SF₆Gas The embodiment of body molecular breakdown total amount, gas chromatograph that will be described carries out gas component and measures the sulfur-bearing analyte that analysis obtains Analyte content is added；

Step 2.2, the content ratio state parameter e of extraction gas component₂₂、e₂₃、e₂₄, wherein state parameter e₂₂For c (SOF₂)/c(SO₂F₂), e₂₃For c (CF₄)/c(CO₂)、e₂₄For c (SOF₂+SO2F2)/c(CF₄+CO₂) three class content ratios are used for The size of reflection discharge energy, directly carries out described gas chromatograph gas component and measures and analyze the content that obtains and carry out two Two ratio calculation；

Step 2.3, it is extracted SO₂F₂And CO₂Mean-square value γ ' (i) of characteristic component gas production rate every day is as state parameter e₂₅、e₂₆, i.e. γ ' (SO₂F₂)、γ′(CO₂)；Characteristic component content Δ c wherein, during calculating, after every 24h sampling_iAnd between the time Ratio every Δ t is the respective components i gas production rate (10 in jth sky^-6/ day), substitute into measurement data formulaCalculate acquisition, the average aerogenesis speed that mean square gas production rate daily samples in illustrating discharge time Rate；

One is extracted characteristic parameter f based on GIS device preventive trial₃={ e₃₁, e₃₂, e₃₃State of insulation index Sub-step:

Based on equipment preventive trial i.e. GIS device dispatch from the factory put into operation before or the test that carries out after overhaul, Choose the quantification state index e being closely related with GIS insulating properties₃₁、e₃₂、e₃₃；Therefore, the present invention chooses preventive trial In moisture e that records of micro-water tester₃₁、SF₆Instrument detected value e is revealed in gas leakage₃₂Right with Insulation Resistance Tester mensuration Ground insulation resistance e₃₃。

At above-mentioned a kind of gas insulated combined electrical equipment Condition assessment of insulation index system construction method, choose PD and electrically join Amount f₁={ e₁₁, e₁₂, e₁₃, e₁₄, e₁₅, e₁₆, e₁₇, e₁₈, e₁₉State of insulation index sub-step in:

First, PD electric parameter is that reaction GIS device state of insulation the most directly embodies, owing to insulation defect is made at electric field Essence under with is PD phenomenon, therefore the electromagnetic signal that PD excites contacts the tightst, based on SF with state of insulation₆The base of gas PD Plinth is tested, and PD electric parameter mostlys come from pulse current method and ultra-high-frequency detection method (Ultra High Frequency, UHF) Method, gathers a large amount of time-domain sampling values of the ultra-high frequency signal q of PD Monitoring Data, i.e. PD by UHF method；

Secondly, using the change in the ultra-high frequency signal q amplitude unit interval, (Δ q/ Δ t) is as the base of PD signal analysis This parameter, chooses three basic parameters of shelf depreciation electric parameter: discharge pulse amplitude (p), continuous two electric discharge arteries and veins Time interval (Δ t) and the discharging gap (Δ T) of punching；It is PD monitoring with power frequency sinusoidal ac signal f=Asin (314t) The reference signal of signal data q, is set to 2 power frequency periods, by signal by Δ TWithTwo regions Interior data are extracted and are arranged as positive half period signalWith negative half-cycle signalMeanwhile, positive half period signal is takenWith negative Semiperiodic signalInterior electric discharge amplitude occurs once to discharge more than statistics during a certain fixed value, and time interval directly uses twice phase Adjacent discharging time subtracts each other and obtains, and then time interval also respectively constitutes sequence by the front/rear cycleWithWhole collection To the data of power frequency period may be constructed sequence Δ T with Δ T for the unit time_w；Based on this data handling procedure, it is possible to complete The extraction of electric state index.

Present invention have the advantage that 1. the invention provides gas insulated combined electrical equipment Condition assessment of insulation index body System, compensate for the state of insulation blank without unified reliable assessment index system of existing SF6 gas insulated electric apparatus, for SF₆ The state estimation of gas insulated electric apparatus provides basis with the developmental research of fault diagnosis technology；2. the setting at structure of the present invention In standby state index plant process, fully take into account electric, chemistry and the comprehensive factor of preventive trial of equipment, carried The accuracy of high later stage GIS device state of insulation and credibility.3. the present invention builds Condition assessment of insulation index system and follows Certain principle, under the guidance of science principle, it is established that the most quantifiable index system feasible, succinct.4. the present invention specifically examines When considering to the selection of every layer state index, it is necessary to select the state parameter having good discrimination degree, take into full account showing of Data Source There is technical merit.5. the present invention selects the most representational state parameter to describe state of insulation and Change and Development trend thereof comprehensively, It it is the method for economy practicality again.Selecting index the most of the present invention calculates simple, it is easy to promote, and refers to for other equipment states similar assessment Mark carries structure and offers reference.The index system that the present invention builds is based on insulation physical essence with to experimental phenomena data message On statistical basis, accomplished succinctly the most not only to have no lack of key message, comprehensive but also unlikely tediously long, overall take into account with level as far as possible A series of requirements, provide the system of feasible science again for a progressive insulation assessment models of setting up.

Accompanying drawing explanation

Fig. 1 is the apparatus insulated State Assessment Index System block diagram of the present invention.

Fig. 2 is that each index of index system of the present invention illustrates schematic diagram.

Fig. 3 is the UHF shelf depreciation diagnostic equipment DMS data of certain 110kV GIS device monitoring.

Fig. 4 is that the basic parameter of non-phase non-temporal pattern obtains schematic diagram (1. discharge pulse amplitude；2. put continuously for two The time interval of electricity；3. discharging gap).

Fig. 5 is the PD chemical parameters that certain 110kV GIS device off-line obtains.

Detailed description of the invention

Below in conjunction with detailed description of the invention, further illustrate the present invention.

Embodiment 1

A kind of gas insulated combined electrical equipment Condition assessment of insulation index system establishment scheme, to certain 110kV GIS device Carry out SF₆Specifically comprising the following steps that of gas insulated combined electrical equipment Condition assessment of insulation index

(1) PD electric parameter f₁={ e₁₁, e₁₂, e₁₃, e₁₄, e₁₅, e₁₆, e₁₇, e₁₈, e₁₉State of insulation index

1. UHF PD data acquisition

PD electric parameter is that reaction GIS device state of insulation the most directly embodies, owing to insulation defect is under electric field action Essence be PD phenomenon, therefore the electromagnetic signal that excites of PD and state of insulation contact the tightst, based on SF₆The basis of gas PD is real Testing, PD electric parameter mostlys come from ultra-high-frequency detection method (Ultra High Frequency, UHF) method, is gathered by UHF method A large amount of time-domain sampling values of the ultra-high frequency signal q of PD Monitoring Data, i.e. PD.Directly utilize UHF shelf depreciation diagnostic equipment DMS pair 2000 power frequency periods of UHF PD signal that described 110kV GIS device #1 interval is gathered are as shown in Figure 3.

2. electrically basic parameter amount obtains

With the change in the UHF signal q amplitude unit interval, (Δ q/ Δ t) is the basic parameter of PD signal analysis, Jin Erxuan Take three basic parameters of shelf depreciation electric parameter: discharge pulse amplitude (p), the time interval of continuous two discharge pulses (required basic parameter data are extracted by Δ t) and discharging gap (Δ T) such as illustration in Fig. 4.Sinusoidal with power frequency AC signal f=Asin (314t) is the reference signal of PD monitoring signal data q, Δ T is set to 2 power frequency periods and is 0.04s, by monitoring signal data signal q's Interior fetched data with

Interior data are extracted and are arranged as positive half period signalWith negative half-cycle signalMeanwhile, positive half period signal is takenWith negative Semiperiodic signalInterior amplitude is set to discharge gage once more than 8mV statistics, and time interval is directly with twice adjacent discharging time Subtracting each other and obtain, then time interval also respectively constitutes sequence by the front/rear cycleWithWhole 2000 power frequencies collected The data in cycle constitute sequence Δ T₁..., Δ T_w..., Δ T₁₀₀₀。

3. electric state index extraction

Electric state index extraction process is: first, is extracted pulse amplitude correlation behavior parameter e₁₁、e₁₂、e₁₃.Wherein, e₁₁: N_mag,Electric discharge for the front/rear cycleThe total degree of superposition reflects the front/rear cycle and puts Electricity repetitive rate；e₁₂: E_mag,Wherein The half wave amplitude average for the front/rear cycle Reflect strength of discharge, byObtain；e₁₃: S_mag,Amplitude standard Difference, whereinThe half wave amplitude standard deviation for the front/rear cycle reflects the change of front/rear periodic discharging pulse amplitude, byWithObtain.Second, it is extracted the shape that time interval is relevant State property e₁₄、e₁₅、e₁₆.Wherein, e₁₄: E_int,InFor in the average of front/rear time-of-week interval Maximum, describe the time interval of double electric discharge, byWithCalculate；e₁₅: N_int,InFor the time interval superposition sum in front/rear cycle, when describing discharge pulse sequence duration Between；e₁₆: S_int,In takeThe time interval standard deviation maximum in front/rear cycle, describes The change of time interval, byWithObtain；3rd, it is extracted and puts The interval relevant state parameter e of electricity₁₇、e₁₈、e₁₉.Wherein, e₁₇: Δ T_min,Characterize electric discharge interval feature； e₁₈: P,Characterize the polar character of PD；e₁₉: N_ref,Characterize the polarity of PD Feature, is averagely divided into 20 subintervals by each power frequency period, in each interval more than or equal to 3 times and discharge above as Whether it is the decision criteria discharged, thus the total discharge range N to the front/rear cycle_refAdd up.

(2) PD chemical parameters f₂={ e₂₁, e₂₂, e₂₃, e₂₄, e₂₅, e₂₆State of insulation index

1. gas component data acquisition

The gas of the 110kV GIS device #1 compartment described in collection, carries out gas component with gas chromatograph and measures The SF arrived₆The four kinds of typical CF of characteristic gas decomposed₄、CO₂、SO₂F₂、SOF₂Content.

2. chemical state index extraction

Chemical state index extraction process is: first, extracts sulfur-bearing analyte and decomposes total amount state parameter e₂₁, contain all Sulfide sum is as SF₆Gas molecule decomposes the embodiment of total amount, and gas chromatograph that will be described carries out gas component measurement Analyze the sulfur-bearing analyte analyte content c (SOF obtained₂)+c(SO₂F₂).Second, extract the content ratio of gas component State parameter e₂₂、e₂₃、e₂₄, wherein state parameter e₂₂For c (SOF₂)/c(SO₂F₂), e₂₃For c (CF₄)/c(CO₂)、e₂₄For c (SOF₂+SO2F2)/c(CF₄+CO₂) three class content ratios are for reflecting the size of discharge energy, directly by described gas chromatogram Instrument carries out gas component and measures and analyze the content that obtains and carry out ratio calculation two-by-two.3rd, the spy after every 24h is sampled Levy constituent contentIt is CO with the ratio of time interval Δ t₂With SO₂F₂Respective components is at the aerogenesis in jth sky Speed (10^-6/ day), measure herein and can be carried out continuously 4 days, substitute into measurement data formulaWithCalculate γ ' (SO₂F₂)、γ′(CO₂) i.e. shape State property e₂₅、e₂₆, obtain data as shown in Figure 5.

(3) the characteristic parameter f of preventive trial₃={ e₃₁, e₃₂, e₃₃State of insulation index

Preventive trial based on described 110kV GIS device, the 110kV GIS device #1 compartment described in collection Gas, moisture e recorded with microwater device₃₁, test result display arc extinguishing air chamber c (H₂O)=163ppm.With gas leakage inspection Survey instrument and record the interior SF of described 110kV GIS device #1 compartment₆Gas leakage e₃₂It is 0.48 μ L/L.e₃₃Use insulation resistance The gas primary circuit of described 110kV GIS device #1 compartment is tested by tester, obtains insulation against ground resistance measured value It is about 7500M Ω.

Specific embodiment described herein is only to present invention spirit explanation for example.Technology neck belonging to the present invention Described specific embodiment can be made various amendment or supplements or use similar mode to replace by the technical staff in territory Generation, but without departing from the spirit of the present invention or surmount scope defined in appended claims.

Claims (2)

1. a gas insulated combined electrical equipment Condition assessment of insulation index system construction method, it is characterised in that including:

Choose PD electric parameter f for one₁={ e₁₁,e₁₂,e₁₃,e₁₄,e₁₅,e₁₆,e₁₇,e₁₈,e₁₉State of insulation index sub-step:

Step 1.1, extraction pulse amplitude correlation behavior parameter e₁₁、e₁₂、e₁₃；Wherein, e₁₁: N_mag,For The electric discharge in front/rear cycleThe total degree of superposition reflects front/rear periodic discharging repetitive rate,；e₁₂: E_mag,WhereinThe half wave amplitude average for the front/rear cycle reflects strength of discharge, ByObtain；e₁₃: S_mag,Amplitude standard deviation, whereinThe half wave amplitude standard deviation for the front/rear cycle reflects the change of front/rear periodic discharging pulse amplitude, byWith $S_{mag}^b=\sqrt{\frac{\underset{k}{\Σ}{(p_k^b/E_{mag}^b-1)}^2}{N_{mag}^b}}$ Obtain；

Step 1.2, it is extracted the state parameter e that time interval is relevant₁₄、e₁₅、e₁₆；Wherein, e₁₄: E_int,InFor the maximum in the average of front/rear time-of-week interval, describe double electric discharge Time interval, by $E_{\mathrm{int}}^f=\frac{\underset{l}{\Σ}{\mathrm{\Δt}}_l^f}{N_{\mathrm{int}}^f}$ With $E_{mag}^b=\frac{\underset{l}{\Σ}{\mathrm{\Δt}}_l^b}{N_{\mathrm{int}}^b}$ Calculate；e₁₅: N_int, $N_{\mathrm{int}}=N_{\mathrm{int}}^f+N_{\mathrm{int}}^b$ InFor The time interval superposition sum in front/rear cycle, describes discharge pulse sequence time duration；e₁₆: S_int,In takeThe time interval standard deviation maximum in front/rear cycle, describes time interval Change, by $S_{\mathrm{int}}^f=\sqrt{\frac{\underset{l}{\Σ}{({\mathrm{\Δt}}_l^f/E_{\mathrm{int}}^f-1)}^2}{N_{\mathrm{int}}^f}}$ With $S_{\mathrm{int}}^b=\sqrt{\frac{\underset{l}{\Σ}{({\mathrm{\Δt}}_l^b/E_{\mathrm{int}}^b-1)}^2}{N_{\mathrm{int}}^b}}$ Obtain；

Step 1.3, it is extracted the state parameter e that discharge range is relevant₁₇、e₁₈、e₁₉；Wherein, e₁₇: Δ T_min,Characterize electric discharge interval feature；e₁₈: P,Characterize the polarity of PD Feature；e₁₉: N_ref,Characterize the polar character of PD, power frequency period be averagely divided into 20 subintervals, For the judgement whether discharged, more than or equal to 3 times and whether above electric discharge is as being the decision criteria discharged in each interval, Thus the total discharge range to the front/rear cycle Add up；

One is extracted PD chemical parameters f₂={ e₂₁,e₂₂,e₂₃,e₂₄,e₂₅,e₂₆State of insulation index sub-step: based on SF₆Gas Body component Basic Experiment Study, characterizes the PD chemical feature parameter f of state of insulation₂Gas component measurement is carried out with gas chromatograph Analyze the SF obtained₆The four kinds of typical CF of characteristic gas decomposed₄、CO₂、SO₂F₂、SOF₂Content, decomposition rate, content ratio Characterize degree of discharge, specifically include:

Step 2.1, extraction sulfur-bearing analyte decompose total amount state parameter e₂₁, using all sulfur compound sums as SF₆Gas divides The sub embodiment decomposing total amount, gas chromatograph that will be described carries out gas component and measures the sulfur-bearing analyte decomposition that analysis obtains Thing content is added；

Step 2.2, the content ratio state parameter e of extraction gas component₂₂、e₂₃、e₂₄, wherein state parameter e₂₂For c (SOF₂)/c (SO₂F₂), e₂₃For c (CF₄)/c(CO₂)、e₂₄For c (SOF₂+SO2F2)/c(CF₄+CO₂) three class content ratios be used for reflect electric discharge The size of energy, directly carries out described gas chromatograph gas component and measures and analyze the content that obtains and carry out ratio meter two-by-two Calculate；

Step 2.3, it is extracted SO₂F₂And CO₂Mean-square value γ of characteristic component gas production rate every day ' (i) as state parameter e₂₅、 e₂₆, i.e. γ ' (SO₂F₂)、γ'(CO₂)；Characteristic component content Δ c wherein, during calculating, after every 24h sampling_iWith time interval Δ The ratio of t is the respective components i gas production rate (10 in jth sky^-6/ day), substitute into measurement data formulaCalculate acquisition, the average aerogenesis speed that mean square gas production rate daily samples in illustrating discharge time Rate；

One is extracted characteristic parameter f based on GIS device preventive trial₃={ e₃₁,e₃₂,e₃₃State of insulation index sub-step Rapid:

Based on equipment preventive trial i.e. GIS device dispatch from the factory put into operation before or the test that carries out after overhaul, choose The quantification state index e being closely related with GIS insulating properties₃₁、e₃₂、e₃₃；Therefore, during the present invention chooses preventive trial micro- Moisture e that water tester records₃₁、SF₆Instrument detected value e is revealed in gas leakage₃₂Measure the most exhausted with Insulation Resistance Tester Edge resistance e₃₃。

A kind of gas insulated combined electrical equipment Condition assessment of insulation index system construction method the most according to claim 1, its It is characterised by, chooses PD electric parameter f₁={ e₁₁,e₁₂,e₁₃,e₁₄,e₁₅,e₁₆,e₁₇,e₁₈,e₁₉State of insulation index sub-step In Zhou:

First, PD electric parameter is that reaction GIS device state of insulation the most directly embodies, owing to insulation defect is under electric field action Essence be PD phenomenon, therefore the electromagnetic signal that excites of PD and state of insulation contact the tightst, based on SF₆The basis of gas PD is real Testing, PD electric parameter mostlys come from pulse current method and ultra-high-frequency detection method (Ultra High Frequency, UHF) method, A large amount of time-domain sampling values of the ultra-high frequency signal q of PD Monitoring Data, i.e. PD are gathered by UHF method；

Secondly, using in the ultra-high frequency signal q amplitude unit interval change (Δ q/ Δ t) as the basic parameter of PD signal analysis, Choose three basic parameters of shelf depreciation electric parameter: discharge pulse amplitude p, the time interval Δ of continuous two discharge pulses T and discharging gap Δ T；With the reference signal that power frequency sinusoidal ac signal f=Asin (314t) is PD monitoring signal data q, Δ T is set to 2 power frequency periods, by signal $(0~\frac{\mathrm{\Δ}T}{2},\mathrm{\Δ}T~\frac{3\mathrm{\Δ}T}{2},...,i\mathrm{\Δ}T~\frac{(2i+1)\mathrm{\Δ}T}{2},...,999\mathrm{\Δ}T~\frac{1999\mathrm{\Δ}T}{2},i=1,2,...)$ With $(\frac{\mathrm{\Δ}T}{2}~\mathrm{\Δ}T,\frac{3\mathrm{\Δ}T}{2}~2\mathrm{\Δ}T,...,\frac{(2i-1)\mathrm{\Δ}T}{2}~i\mathrm{\Δ}T,...,\frac{1999\mathrm{\Δ}T}{2}~2000\mathrm{\Δ}T,i=1,2,...)$ Data in two regions are extracted whole Reason is positive half period signalWith negative half-cycle signalMeanwhile, positive half period signal is takenWith negative half-cycle signalIn Electric discharge amplitude more than a certain fixed value time statistics occur once discharge, time interval is directly by twice adjacent discharging time phase Subtracting and obtain, then time interval also respectively constitutes sequence by the front/rear cycleWithThe whole power frequency period collected Data may be constructed sequence Δ T with Δ T for the unit time_w；Based on this data handling procedure, it is possible to complete electric state index Extract.