CN103954889A - Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors - Google Patents
Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors Download PDFInfo
- Publication number
- CN103954889A CN103954889A CN201410130796.2A CN201410130796A CN103954889A CN 103954889 A CN103954889 A CN 103954889A CN 201410130796 A CN201410130796 A CN 201410130796A CN 103954889 A CN103954889 A CN 103954889A
- Authority
- CN
- China
- Prior art keywords
- current sensor
- pincerlike current
- harmonic
- formula
- pincerlike
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a capacitive type device insulation parameter electrification testing method based on pincerlike current sensors. The method comprises the following steps that according to a current sampling mode, the pincerlike current sensor (1) is directly clamped on an end screen grounded down lead of a capacitive type device; according to a voltage sampling mode, a measuring resistor (3) is connected between a secondary 100/ \/3V R end and a secondary 100/ \/3V L end of a voltage mutual inductor to form a loop, and the pincerlike current sensor (2) is clamped on the connecting line between the secondary 100/ \/3V R end of the voltage mutual inductor and the measuring resistor or clamped on the connecting line between the secondary 100/ \/3V L end of the voltage mutual inductor and the measuring resistor. According to the capacitive type device insulation parameter electrification testing method based on the pincerlike current sensors, on the premise that the testing precision of the pincerlike current sensors is ensured, the pincerlike current sensors can be used as soon as being clamped, power outage is not needed, great convenience is brought, and potential safety hazards like an end screen open circuit are fundamentally avoided.
Description
Technical field
The present invention relates to the live testing of the insulation parameter of capacitance type equipment in a kind of electric system, belong to the live testing field of capacitance type equipment insulation parameter.
Background technology
In electric system, capacitance type equipment mainly comprises current transformer, high-voltage capacitance formula sleeve pipe, coupling condenser, capacitance type potential transformer, compensation condenser etc.The high voltage electric equipment moving in electrical network, if its inner insulation defect that exists the factors such as bad because manufacturing, aging and outside destroy to cause, the insulation fault of the normal operation of high-tension apparatus and electrical network that will make a difference.For preventing the generation of this type of serious accident, the traditional method adopting is at present after putting equipment in service, regularly has a power failure and carries out preventive trial and maintenance, to detect in time the insulation defect of device interior.But the test condition of power failure preventive trial and running status differ larger, therefore be difficult for correctly diagnosing out the insulation status of high-tension apparatus under ruuning situation, more be difficult to the defect that discovery develops between twice preventive trial interval, this will directly have influence on the test effect of preventive trial.Along with the development of national economy, the whole society is more and more higher to the requirement of the reliability of electric power supply and minimizing power off time simultaneously; Developing gradually of electric system scale, traditional regular power failure preventive trial is time-consuming owing to existing, effort and many drawbacks such as test effect is undesirable and obviously can not meet the requirement of power grid security, reliable and efficient operation, therefore electric equipment operation is implemented to automatic monitoring and insulation status on-line monitoring, realize the inevitable development direction that repair based on condition of component has become following high-tension apparatus test.On-line monitoring mode can obtain the apparatus insulated abnormal characteristic parameter of reflection at any time, is convenient to realize automatic management, but invests relatively largely, and installation is cumbersome, and needs periodic maintenance, and cannot detect its accurate reliability after installing.
And live testing is between power failure prerun and on-line monitoring, can overcome preferably the deficiency of two kinds of methods, there is its technical advance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of without installation, without power failure, " blocks the i.e. charged test method of the capacitance type equipment insulation parameter based on pincerlike current sensor of use, can overcome the deficiencies in the prior art.
Technical scheme of the present invention is: the sampling structure of signal adopts pincerlike current sensor.Current sampling method: pincerlike current sensor (1) is directly stuck on the end shield down conductor of capacitance type equipment; Voltage sampling mode: form loop from connecing a measuring resistance (3) between the secondary 100/ √ 3V of voltage transformer (VT) (R end and L end), pincerlike current sensor (2) is stuck on the connecting line of voltage transformer secondary 100/ √ 3VR end and measuring resistance or is stuck on the connecting line of voltage transformer secondary 100/ √ 3VL end and measuring resistance.
The charged test method of described a kind of capacitance type equipment insulation parameter based on pincerlike current sensor, comprises following steps:
Step 1: pincerlike current sensor (1) is stuck in to the end shield down conductor place of capacitance type equipment A, extracts current waveform.
Step 2: form loop from connecing a measuring resistance (3) between the secondary 100/ √ 3V (R end and L end) of voltage transformer (VT), pincerlike current sensor (2) is stuck on the connecting line of voltage transformer secondary 100/ √ 3VR end and measuring resistance or is stuck on the connecting line of voltage transformer secondary 100/ √ 3VL end and measuring resistance, extracts voltage waveform.
Step 3: the current waveform of the pincerlike current sensor of access (1) and the voltage waveform of pincerlike current sensor (2) in analyser (4).Thereby can calculate the insulation parameter of capacitance type equipment, its computation process is as follows:
According to formula (1) (2), can calculate effective value I and the U of pincerlike current sensor (1) and pincerlike current sensor (2) two paths of signals,
C=I/314U (3)
According to formulism (3), can calculate electric capacity.
The waveform of surveying in reality all contains harmonic component in various degree, any one periodic function is all by periodic first-harmonic, 2,3,4 ... k subharmonic is formed by stacking as shown in formula (4), by formula (5) and formula (6), can isolate fundametal compoment and each harmonic component.
A in formula
0for DC component, need to filter.
A wherein
mkfor first-harmonic or k subharmonic amplitude, a
kfor first-harmonic or k subharmonic phasor real component, b
kfor first-harmonic or k subharmonic phasor imaginary part component.
only first-harmonic is carried out to computing, when k=1, vectorial real part and the vectorial imaginary part that according to formula (5), formula (6), can calculate respectively pincerlike current sensor (1) and pincerlike current sensor (2) two paths of signals first-harmonic, two vectorial mathematic(al) representations are respectively a
n+ j b
nand a
x+ j b
x.
If θ
1a
n+ j b
nvector and X-axis positive dirction angle, θ
2a
x+ j b
xvector and X-axis positive dirction angle, dielectric loss angle δ=90 °-(θ
1-θ
2), according to trigonometric function relation, can obtain:
Compared with the prior art, the present invention regards as several electric capacity connection in series-parallel formation such as the insulation system of current transformer, high-voltage capacitance formula sleeve pipe, coupling condenser, capacitance type potential transformer, compensation condenser etc.; Facts have proved, under working voltage, detect its electric current, electric capacity, dielectric loss angle tangent and can judge its state of insulation.Dielectric loss angle tangent (tan δ) wherein, also claim dielectric dissipation factor to be called for short Dielectric loss angle or dielectric loss, it is the characteristic parameter that characterizes insulation loss size under alternating voltage effect, it only depends on properties of materials and has nothing to do with the shape and size of insulator, so tan δ is very effective as the parameter of reflection Whole Equipment insulation status, on above basis, guaranteeing under the prerequisite of pincerlike current sensor measuring accuracy, adopted pincerlike current sensor, realized " card is used ", without power failure, very convenient, and also fundamentally avoid the potential safety hazards such as end shield open circuit.
Accompanying drawing explanation
Fig. 1 is for carrying out the schematic diagram of live testing to capacitance type equipment;
In figure, 1---pincerlike current sensor (1), 2---pincerlike current sensor (2), 3---measuring resistance, 4---analyser,
5---end shield, 6---ground, 7---soft plastic pipe, 8---down conductor, A---capacitance type equipments
Embodiment
Embodiment: the present embodiment is the live testing of the capacitance type equipment insulation parameter based on pincerlike current sensor, as shown in Figure 1, product to be tested is a capacitance type equipment A, pincerlike current sensor (1) is stuck in and connects on the 5 end shield ends of capacitance type equipment A and the down conductor of 6 ground ends, pincerlike current sensor (2) is stuck in the end of PT secondary voltage on the loop of 3 measuring resistances formation, pincerlike current sensor (1) and pincerlike current sensor (2) two paths of signals be connect into analysis instrument 4 simultaneously, after connecting above-mentioned line, the charged test method of the capacitance type equipment insulation parameter based on pincerlike current sensor, by following steps, complete:
Step 1: pincerlike current sensor (1) is stuck in to the end shield down conductor place of capacitance type equipment A, extracts current waveform.
Step 2: form loop from connecing a measuring resistance (3) between the secondary 100/ √ 3V (R end and L end) of voltage transformer (VT), pincerlike current sensor (2) is stuck on the connecting line of voltage transformer secondary 100/ √ 3VR end and measuring resistance or is stuck on the connecting line of voltage transformer secondary 100/ √ 3VL end and measuring resistance, extracts voltage waveform.
Step 3: the current waveform of the pincerlike current sensor of access (1) and the voltage waveform of pincerlike current sensor (2) in analyser (4).Thereby can calculate the insulation parameter of capacitance type equipment, its computation process is as follows:
(2)
According to formula (1) (2), can calculate effective value I and the U of pincerlike current sensor (1) and pincerlike current sensor (2) two paths of signals,
C=I/314U (3)
According to formulism (3), can calculate electric capacity.
The waveform of surveying in reality all contains harmonic component in various degree, any one periodic function is all by periodic first-harmonic, 2,3,4 ... k subharmonic is formed by stacking as shown in formula (4), by formula (5) and formula (6), can isolate fundametal compoment and each harmonic component.
A in formula
0for DC component, need to filter.
A wherein
mkfor first-harmonic or k subharmonic amplitude, a
kfor first-harmonic or k subharmonic phasor real component, b
kfor first-harmonic or k subharmonic phasor imaginary part component.
only first-harmonic is carried out to computing, when k=1, vectorial real part and the vectorial imaginary part that according to formula (5), formula (6), can calculate respectively pincerlike current sensor (1) and pincerlike current sensor (2) two paths of signals first-harmonic, two vectorial mathematic(al) representations are respectively a
n+ j b
nand a
x+ j b
x.
If θ
1a
n+ j b
nvector and X-axis positive dirction angle, θ
2a
x+ j b
xvector and X-axis positive dirction angle, dielectric loss angle δ=90 °-(θ
1-θ
2), according to trigonometric function relation, can obtain:
Claims (1)
1. a charged test method for the capacitance type equipment insulation parameter based on pincerlike current sensor, base is characterised in that: the method comprises the following steps
Step 1: pincerlike current sensor (1) is stuck in to the end shield down conductor place of capacitance type equipment A, extracts current waveform;
Step 2: form loop from connecing a measuring resistance (3) between the secondary 100/ √ 3V (R end and L end) of voltage transformer (VT), pincerlike current sensor (2) is stuck on the connecting line of voltage transformer secondary 100/ √ 3VR end and measuring resistance or is stuck on the connecting line of voltage transformer secondary 100/ √ 3VL end and measuring resistance, extracts voltage waveform;
Step 3: access the current waveform of pincerlike current sensor (1) and the voltage waveform of pincerlike current sensor (2) in analyser (4), calculate the insulation parameter of capacitance type equipment, its computation process is as follows:
According to formula (1) (2), can calculate effective value I and the U of pincerlike current sensor (1) and pincerlike current sensor (2) two paths of signals,
C=I/314U (3)
According to formulism (3), can calculate electric capacity;
Step 4: because the waveform of surveying in reality all contains harmonic component in various degree, any one periodic function is all by periodic first-harmonic, 2,3,4 ... k subharmonic is formed by stacking, as shown in formula (4), by formula (5) and formula (6), can isolate fundametal compoment and each harmonic component;
A in formula
0for DC component, need to filter;
A wherein
mkfor first-harmonic or k subharmonic amplitude, a
kfor first-harmonic or k subharmonic phasor real component, b
kfor first-harmonic or k subharmonic phasor imaginary part component;
step 5: only first-harmonic is carried out to computing, when k=1, vectorial real part and the vectorial imaginary part that according to formula (5), formula (6), can calculate respectively pincerlike current sensor (1) and pincerlike current sensor (2) two paths of signals first-harmonic, two vectorial mathematic(al) representations are respectively a
n+ j b
nand a
x+ j b
x;
If θ
1a
n+ j b
nvector and X-axis positive dirction angle, θ
2a
x+ j b
xvector and X-axis positive dirction angle, dielectric loss angle δ=90 °-(θ
1-θ
2), according to trigonometric function relation, can obtain:
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410130796.2A CN103954889A (en) | 2014-04-03 | 2014-04-03 | Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410130796.2A CN103954889A (en) | 2014-04-03 | 2014-04-03 | Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103954889A true CN103954889A (en) | 2014-07-30 |
Family
ID=51332187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410130796.2A Pending CN103954889A (en) | 2014-04-03 | 2014-04-03 | Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103954889A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445561A (en) * | 2015-11-10 | 2016-03-30 | 广西电网有限责任公司电力科学研究院 | Wireless measurement instrument for state of electrical equipment in substation |
| CN107229030A (en) * | 2016-08-31 | 2017-10-03 | 广州供电局有限公司 | Monitor Intelligent current transformer on-line |
| CN111323630A (en) * | 2018-12-14 | 2020-06-23 | 大连北方互感器集团有限公司 | Current transformer capable of actually measuring capacitance change in electrified manner |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680799A (en) * | 2012-05-15 | 2012-09-19 | 山东惠工电气股份有限公司 | Transformer substation capacitor on-line monitoring method and device based on wireless mode |
| CN203025253U (en) * | 2013-01-21 | 2013-06-26 | 贵州电力试验研究院 | Capacitive equipment dielectric loss energized testing device |
| CN203444039U (en) * | 2013-08-30 | 2014-02-19 | 西安四环电力监控设备工程有限公司 | High-voltage capacitive equipment on-line monitoring system |
-
2014
- 2014-04-03 CN CN201410130796.2A patent/CN103954889A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680799A (en) * | 2012-05-15 | 2012-09-19 | 山东惠工电气股份有限公司 | Transformer substation capacitor on-line monitoring method and device based on wireless mode |
| CN203025253U (en) * | 2013-01-21 | 2013-06-26 | 贵州电力试验研究院 | Capacitive equipment dielectric loss energized testing device |
| CN203444039U (en) * | 2013-08-30 | 2014-02-19 | 西安四环电力监控设备工程有限公司 | High-voltage capacitive equipment on-line monitoring system |
Non-Patent Citations (2)
| Title |
|---|
| 宋奇吼: "基于TIR2000的电容型设备绝缘参数带电测试", 《电测与仪表》 * |
| 李建明等: "电容型设备绝缘参数带电测试", 《四川工业学院学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445561A (en) * | 2015-11-10 | 2016-03-30 | 广西电网有限责任公司电力科学研究院 | Wireless measurement instrument for state of electrical equipment in substation |
| CN107229030A (en) * | 2016-08-31 | 2017-10-03 | 广州供电局有限公司 | Monitor Intelligent current transformer on-line |
| CN111323630A (en) * | 2018-12-14 | 2020-06-23 | 大连北方互感器集团有限公司 | Current transformer capable of actually measuring capacitance change in electrified manner |
| CN111323630B (en) * | 2018-12-14 | 2024-04-30 | 大连北方互感器集团有限公司 | Current transformer capable of live-line actually-measured capacitance change |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103926514B (en) | High voltage equipment insulation diagnostic method under a kind of charging operation state | |
| CN107064600B (en) | A kind of GIS bus voltage measurement device established in low-pressure tank body side surface | |
| CN103091609A (en) | Performance detecting system and method thereof of gas insulated substation (GIS) partial discharge on-line monitoring device | |
| CN108646144A (en) | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system | |
| CN104502762A (en) | Data validity detection device for transformer bushing monitoring system | |
| CN202854255U (en) | Capacitor type potential transformer testing device | |
| CN104330677B (en) | A kind of electronic current mutual inductor experimental rig and test method | |
| CN102095954A (en) | Preventive test method for capacitance voltage transformer free from dismounting lead | |
| CN106483382A (en) | A kind of GIS circuit loop resistance measuring instrument and measuring method | |
| CN106383259A (en) | Induced current and inducted voltage measurement method of multi-circuit transmission lines on same tower | |
| Rahimpour et al. | The application of sweep frequency response analysis for the online monitoring of power transformers | |
| CN103954889A (en) | Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors | |
| CN205210220U (en) | Measure device of direct current circuit to ground leakage current | |
| Zhao et al. | Testing and modelling of voltage transformer for high order harmonic measurement | |
| CN103424627A (en) | Method for measuring zero-sequence impedance of parallel distribution network circuit at double ends | |
| CN103869113B (en) | High-voltage series resonance device and voltage withstanding test method using same | |
| CN105866667B (en) | A kind of loop resistance test method of two sides earth breaker | |
| CN105182157A (en) | Neutral point multi-point grounding detection device based on high-accuracy detection current | |
| Brandt et al. | Analysis of winding fault in electric machines by frequency method | |
| CN107271775B (en) | electric power overhead line phase detection method | |
| CN103424628A (en) | Method for measuring parallel grid line positive sequence impedance | |
| CN205450243U (en) | Fault indicator coil tester | |
| CN203216999U (en) | Capacitive equipment dielectric loss live line measurement sampling device | |
| CN202502136U (en) | Measuring device for induced voltage and induced current of AC line | |
| CN205015427U (en) | Neutral point multipoint earthing detection device based on high accuracy testing electric current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140730 |