CN2758782Y - Non-contact electric generator local discharge on-line monitoring direction sensing apparatus - Google Patents
Non-contact electric generator local discharge on-line monitoring direction sensing apparatus Download PDFInfo
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- CN2758782Y CN2758782Y CN 200420009985 CN200420009985U CN2758782Y CN 2758782 Y CN2758782 Y CN 2758782Y CN 200420009985 CN200420009985 CN 200420009985 CN 200420009985 U CN200420009985 U CN 200420009985U CN 2758782 Y CN2758782 Y CN 2758782Y
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Abstract
The utility model relates to a power system apparatus, particularly a non-contact local discharge on-line monitoring direction sensing apparatus for an electric generator, which is composed of two sets of signal couplers, signal transmitting units, filters and amplifiers with identical performances and a direction judging apparatus, wherein the signal couplers are connected with the filters and the amplifiers through the signal transmitting units, and the two amplifiers are respectively connected with the direction judging apparatus. The signal couplers comprise a parallel capacitor and a detecting resistor, the distance between pole plates of the parallel capacitor is 0.5 centimeters-1.5 centimeters, the sizes of the pole plates of the parallel capacitor are 25 centimeters * 15 centimeters, and the resistance value of the detecting resistor is 450 ohms-550 ohms; the length of the signal transmitting units is 1 meters-2 meters, and the input impedance is a cable of 50 ohms; the input impedance of the amplifiers is 50 ohms, and the gain of the amplifiers is 35 decibels-50 decibels. The utility model has the advantages of strong anti-electromagnetic interference performance, high sensitivity and convenient and safe use.
Description
Technical field
The utility model relates to a kind of electric system device, particularly a kind of contactless generator local discharge on-line monitoring direction sensing device.
Background technology
Chinese large-sized generator accident happens occasionally in recent years, has caused tremendous loss to national economy.According to incomplete statistics, in the period of nineteen eighty-three to 1,991 200 megawatt turbodynamos only stator failure just have 14, account for 13.7% of the total platform number of homemade at that time 200 megawatt units.Therefore, the malfunction monitoring of high-rating generator and diagnosis have become the urgent need technology of current power industrial safety operation.It not only has unique effect to the safe operation that guarantees electric system, keeps in repair the stage but also can make power system device progressively carry out the transition to foreseeability from the present preventative maintenance stage, improves the economic benefit of electric system effectively.
In the generator local discharge on-line monitoring both domestic and external, usually sensor is inserted the generator neutral point ground wire and detect local discharge signal.Yet, discharge, connect the frequency spectrum that other electromagnetic pulses such as discharge have and the motor discharge is similar of the transformer of generator bus from the discharge of generator bus support insulator, the motor bus-tie circuit breaker on generator opposite, can import the generator neutral point ground wire into along generator bus, detection to generator discharge produces serious the interference, thereby causes sensor to arrive wrong signal.The PDA device of states such as Canada development is judged the direction that the pulse edge bus is propagated according to differential principle, thereby is reached the purpose of eliminating from the pulse of generator external disturbance by a pair of capacitive transducer at a distance of certain distance is installed on generator bus.But because capacitive transducer is direct and bus links, introduced potential safety hazard, therefore be difficult for being accepted by the generating plant.
The utility model content
The purpose of this utility model is to improve the shortcoming of prior art, and provide a kind of direction sensing device that is used for the generator local discharge on-line monitoring, this direction sensing device and generator bus directly are not electrically connected, and its anti-electromagnetic interference capability is strong, highly sensitive, esy to use, safe and reliable.
To achieve these goals, the utility model adopts following technical proposals: it is made up of identical signal coupler, signal transmission unit, wave filter, amplifier and the direction determining device of two cover performances.
Each described signal coupler comprises a parallel capacitor and a detection resistance, and the distance between described parallel capacitor pole plate is 0.5 centimetre～1.5 centimetres.The parallel capacitor pole plate is of a size of 15 centimetres of 25 cm x, support by insulation column, with air as insulating medium.The resistance that detects resistance is 450 Europe～550 Europe.The frequency of the undesired signal that the carrier-in-interference of coming from electric system and the controllable silicon of exciter produce is usually less than 1 megahertz, so the low-frequency cut-off frequency of signal coupler can be avoided the impulse disturbances that carrier-in-interference and controllable silicon produce when being 1 megahertz.Most of frequency component of the partial discharge pulse on the generator unit stator model line rod concentrates on 0～35 megahertz, discharge is except most of frequency component concentrates on 0～35 megahertz between groove, also has certain frequency component at 60 megahertzes～85 megahertzes in than higher frequency band, but adopt higher detection frequency to the having relatively high expectations of hardware, economic cost is also bigger.Therefore, selecting the low-frequency cut-off frequency of signal coupler is 1 megahertz, and the high-frequency cut-off frequency is that 60 megahertzes are more reasonable.Mainly making the frequency band of signal coupler by the distance between adjusting parallel capacitor pole plate with the resistance that detects resistance is 1 megahertz～60 megahertzes.Parallel capacitor is connected with signal transmission unit by detecting resistance.
What described signal transmission unit adopted is that input impedance is the cable in 50 Europe.Because the electric capacity of cable is in parallel with capacitor, the electric capacity of the long more cable of cable is also big more, then the voltage of exporting on the cable is just more little, the sensitivity of sensor circuit is also more little, but in actual detected, require the amplifier can not be too near apart from generator bus, therefore used transmission cable can not be too short when the local discharge signal of actual measurement generator, more must use, so the length of cable is chosen between 1 meter～2 meters.
The wave filter that contactless generator local discharge direction sensing device adopts is 4 grades of wave filters, and its effect is to filter frequency less than 1 megahertz or greater than the undesired signal of 60 megahertzes.Wave filter is connected between cable and the amplifier.The input impedance of amplifier is 50 Europe, because the signal that signal coupler detects in the frequency band of 1 megahertz～60 megahertzes is very faint, so Amplifier Gain is elected 35 decibels～50 decibels as, the sensitivity that is used for improving sensing device; The direction determining device has two input adapters, is connected with two amplifiers respectively.
Principle of work of the present utility model is: partial discharge pulse's signal that generator insulating produces is when generator bus is propagated, around bus, be accompanied by electromagnetic wave propagation, signal coupler is placed on apart from the position of 15 centimetres～25 centimetres of buses and does not contact with bus, signal coupler can detect the electromagnetic wave that local discharge signal sends from bus; When two signal couplers when the certain distance, will there be tangible priority difference the time that the signal of propagating on bus arrives these two signal couplers, the difference that two signal couplers of direction of passage decision circuitry judgement detect the priority of signal can be judged the direction that signal is propagated on bus, when signal from the generator when outside, direction determining device output low level; When pulse from generating during pusher side, direction determining device output high level, thus identify the local discharge signal that spreads out of from the generator the inside.
The utility model does not directly contact with generator bus, and anti-electromagnetic interference capability is strong, highly sensitive, and is esy to use, safe and reliable.
Description of drawings
Fig. 1 is that the utility model is formed and connection diagram.
Embodiment
As shown in Figure 1, by parallel capacitor 1 with detect bus 4 exit positions that signal coupler that resistance 2 forms is installed in generator 3, by parallel capacitor 5 and detect signal coupler that resistance 6 forms be installed in signal coupler that the capable capacitor 1 of anomaly and detection resistance 2 forms along with 2 meters positions far away of bus parallel direction.Distance between parallel capacitor 1 and 5 pole plates is 1 centimetre, and pole plate is of a size of 15 centimetres of 25 cm x, support by insulation column, with air as insulating medium.The resistance that detects resistance 2 and 6 is 500 Europe.Parallel capacitor 1 is connected with cable 7 by detecting resistance 2, and parallel capacitor 5 passes through detection resistance 6 and is connected with cable 8, and cable 7 and 8 input impedance are 50 Europe, and length is 1.5 meters.Wave filter 9 and 10 is 4 grades of wave filters, and wave filter 9 is connected between cable 7 and the amplifier 11, and wave filter 10 is connected between cable 8 and the amplifier 12.Amplifier 11 and 12 input impedance are 50 Europe, and gain is 35 decibels.The signal that is come out by amplifier 11 and amplifier 12 is input direction determining device 13 all.When pulse signal from the generator when outside, the signal of amplifier 11 outputs lags behind the signal of amplifier 12 outputs, direction determining device 13 output low levels; When pulse signal from generating during pusher side, the signal of amplifier 11 outputs is early than the signal of amplifier 12 outputs, direction determining device 13 output high level, thereby can identify the local discharge signal that spreads out of from the generator the inside.
Claims (4)
1. contactless generator local discharge on-line monitoring direction sensing device, it is characterized in that: it is made up of identical signal coupler, signal transmission unit, wave filter, amplifier and the direction determining device of two cover performances, signal coupler is connected with amplifier with wave filter by signal transmission unit, and two amplifiers are connected with the direction determining device respectively.
2. contactless generator local discharge on-line monitoring direction sensing device according to claim 1, it is characterized in that: described signal coupler comprises a parallel capacitor and a detection resistance, distance between the parallel capacitor pole plate is 0.5 centimetre～1.5 centimetres, support by insulation column, with air as insulating medium, capacitor plate is of a size of 15 centimetres of 25 cm x, and the resistance that detects resistance is 450 Europe～550 Europe.
3. contactless generator local discharge on-line monitoring direction sensing device according to claim 1 is characterized in that: signal transmission unit is that length is 1 meter～2 meters, and input impedance is the cable in 50 Europe.
4. contactless generator local discharge on-line monitoring direction sensing device according to claim 1, it is characterized in that: the input impedance of amplifier is 50 Europe, Amplifier Gain is 35 decibels～50 decibels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420009985 CN2758782Y (en) | 2004-12-22 | 2004-12-22 | Non-contact electric generator local discharge on-line monitoring direction sensing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420009985 CN2758782Y (en) | 2004-12-22 | 2004-12-22 | Non-contact electric generator local discharge on-line monitoring direction sensing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2758782Y true CN2758782Y (en) | 2006-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420009985 Expired - Fee Related CN2758782Y (en) | 2004-12-22 | 2004-12-22 | Non-contact electric generator local discharge on-line monitoring direction sensing apparatus |
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| CN (1) | CN2758782Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009003361A1 (en) * | 2007-07-03 | 2009-01-08 | Xi'an Jiaotong University | An online partial discharge monitoring system of generator and method thereof |
| CN101044410B (en) * | 2004-08-20 | 2010-11-24 | 株式会社东芝 | Partial discharge detection apparatus and detection method of electrical rotating machine |
| CN102135594A (en) * | 2011-01-30 | 2011-07-27 | 太原理工大学 | Insulation state monitoring device of high voltage motor for main fan used for mine |
| CN102522831A (en) * | 2011-12-08 | 2012-06-27 | 辽宁省电力有限公司沈阳超高压分公司 | Non-contact electric field type induction power access method and power access apparatus thereof |
| CN106093732A (en) * | 2016-07-28 | 2016-11-09 | 华北电力大学 | Optical fiber direction sensor for high voltage electric equipment Partial Discharge Detection |
| CN103792927B (en) * | 2007-03-12 | 2017-01-04 | 艾默生过程管理电力和水力解决方案有限公司 | The use of statistical analysis in power plant performance monitoring |
| CN111521916A (en) * | 2020-05-09 | 2020-08-11 | 中国电建集团华东勘测设计研究院有限公司 | Generator partial discharge measuring device and measuring method |
-
2004
- 2004-12-22 CN CN 200420009985 patent/CN2758782Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101044410B (en) * | 2004-08-20 | 2010-11-24 | 株式会社东芝 | Partial discharge detection apparatus and detection method of electrical rotating machine |
| CN103792927B (en) * | 2007-03-12 | 2017-01-04 | 艾默生过程管理电力和水力解决方案有限公司 | The use of statistical analysis in power plant performance monitoring |
| WO2009003361A1 (en) * | 2007-07-03 | 2009-01-08 | Xi'an Jiaotong University | An online partial discharge monitoring system of generator and method thereof |
| US8271213B2 (en) | 2007-07-03 | 2012-09-18 | Xi'an Jiaotong University | Online partial discharge monitoring system of generator and method thereof |
| CN102135594A (en) * | 2011-01-30 | 2011-07-27 | 太原理工大学 | Insulation state monitoring device of high voltage motor for main fan used for mine |
| CN102135594B (en) * | 2011-01-30 | 2016-01-20 | 太原理工大学 | Insulation state monitoring device of high voltage motor for main fan used for mine |
| CN102522831A (en) * | 2011-12-08 | 2012-06-27 | 辽宁省电力有限公司沈阳超高压分公司 | Non-contact electric field type induction power access method and power access apparatus thereof |
| CN106093732A (en) * | 2016-07-28 | 2016-11-09 | 华北电力大学 | Optical fiber direction sensor for high voltage electric equipment Partial Discharge Detection |
| CN106093732B (en) * | 2016-07-28 | 2019-01-15 | 华北电力大学 | Optical fiber direction sensor for high voltage electric equipment Partial Discharge Detection |
| CN111521916A (en) * | 2020-05-09 | 2020-08-11 | 中国电建集团华东勘测设计研究院有限公司 | Generator partial discharge measuring device and measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |