CN103529371A - Invasive online monitoring device for partial discharge of power distribution equipment - Google Patents
Invasive online monitoring device for partial discharge of power distribution equipment Download PDFInfo
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Abstract
The invention discloses an invasive online monitoring device for partial discharge of power distribution equipment. The online monitoring device comprises a sensing unit and a monitoring host, wherein the sensing unit comprises a transient-state ground voltage sensing unit and an ultrasonic sensing unit, the monitoring host comprises a signal conditioning unit, a signal processing unit, a display unit, an ultrasonic signal monitoring unit and a power supply unit; the transient-state ground voltage sensing unit and the ultrasonic sensing unit are respectively connected with a plurality of input ends of the signal conditioning unit, a plurality of output ends of the signal conditioning unit are respectively connected with the signal processing unit and the ultrasonic signal monitoring unit, the output end of the signal processing unit is connected with the display unit, the power supply unit is respectively connected with the signal conditioning unit, the signal processing unit, the display unit and the ultrasonic signal monitoring unit to provide a working power supply, the sensing unit acquires a sensing signal, and the monitoring host receives a detection signal of the sensing unit.
Description
Technical field
The present invention relates to controller switching equipment insulation, current-carrying On-line Fault monitoring field, a kind of intrusive mood controller switching equipment local discharge on-line monitoring device.
Background technology
Controller switching equipment insulation and current-carrying fault account for fault total 30%-50% occur, and are the major failure of controller switching equipment.Insulation and the generation of current-carrying fault be all with partial discharge phenomenon output, by detect the shelf depreciation state judgement of controller switching equipment and analyze controller switching equipment insulation status be apply the most at present, the most extensively, effective method.
The controller switching equipment shelf depreciation work of patrolling and examining at present is progressively carried out, but comes with some shortcomings, and mainly comprises:
(1) existing testing product is many obtains data by controller switching equipment cabinet external detection.Because controller switching equipment working environment is complicated, the signal that shelf depreciation produces is very easily submerged in noise, and testing result reference value declines.
(2), along with controller switching equipment cabinet sealing is become better and better, cabinet obtains data more and more difficult (especially ultrasonic signal) outward, and cabinet external environment noise is large, detects data reliability and declines.
(3) affected by controller switching equipment installation site larger in the work of patrolling and examining, and as switch cubicle, on-the-spot a lot of switch cubicles are all to adopt by wall to install, and the interval of the switch cubicle back side and between the walls is less, and patrol officer cannot arrive its back side and detect, and causes detection not comprehensive.
(4) be subject to the impact of controller switching equipment structural design, part controller switching equipment design height is higher, and controller switching equipment top Partial Discharge Detection is caused to very large task difficulty.
Along with electrical network scale in recent years develops rapidly, controller switching equipment quantity sharply increases, and patrol and examine workload and increase severely, and the basic zero growth of patrol officer causes patrol officer's labour intensity obviously to increase.
Summary of the invention
The object of the present invention is to provide a kind of intrusive mood controller switching equipment local discharge on-line monitoring device, it can adopt acoustoelectric combined monitoring technology directly from controller switching equipment inside, to obtain local discharge signal under electriferous state, shelf depreciation state to controller switching equipment carries out on-line monitoring, and this device can be expanded communication function establishment partial discharge monitoring system.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
A controller switching equipment local discharge on-line monitoring device, is characterized in, comprises sensing unit and monitoring host computer; Above-mentioned sensing unit is comprised of transient state ground voltage sensing unit and supersonic sensing unit; Above-mentioned monitoring host computer is comprised of signal condition unit, signal processing unit, display unit, ultrasonic signal monitoring unit and power supply unit;
Above-mentioned transient state ground voltage sensing unit and above-mentioned supersonic sensing unit, be connected with a plurality of input ends of above-mentioned signal condition unit respectively, a plurality of output terminals of above-mentioned signal condition unit are connected with above-mentioned signal processing unit, above-mentioned ultrasonic signal monitoring unit respectively; The output terminal of above-mentioned signal processing unit is connected with above-mentioned display unit; Above-mentioned power supply unit is connected with above-mentioned signal condition unit, signal processing unit, display unit, ultrasonic signal monitoring unit respectively, and working power is provided; Above-mentioned sensing unit obtains transducing signal, and above-mentioned monitoring host computer receives the detection signal of this sensing unit.
Above-mentioned intrusive mood controller switching equipment local discharge on-line monitoring device, is characterized in, above-mentioned transient state ground voltage sensing unit comprises: excretion disposal, signal-transmitting cable and impedance matching connector; Above-mentioned excretion disposal is connected with above-mentioned impedance matching connector by above-mentioned signal-transmitting cable.
Above-mentioned intrusive mood controller switching equipment local discharge on-line monitoring device, is characterized in, above-mentioned supersonic sensing unit comprises: ultrasonic sensor, signal-transmitting cable and impedance matching connector; Above-mentioned ultrasonic sensor is connected with above-mentioned impedance matching connector by above-mentioned signal-transmitting cable.
Above-mentioned intrusive mood controller switching equipment local discharge on-line monitoring device, is characterized in, above-mentioned signal condition unit comprises: transient state ground voltage signal condition unit and ultrasonic signal conditioning unit; The input end of the input end of above-mentioned transient state ground voltage signal condition unit, above-mentioned ultrasonic signal conditioning unit is connected with the output terminal of the output terminal of above-mentioned transient state ground voltage sensing unit, above-mentioned supersonic sensing unit respectively, output terminal of the output terminal of above-mentioned transient state ground voltage signal condition unit, above-mentioned ultrasonic signal conditioning unit is connected with a plurality of input ends of above-mentioned signal processing unit, and another output terminal of above-mentioned ultrasonic signal conditioning unit is connected with above-mentioned ultrasonic signal monitoring unit.
Above-mentioned intrusive mood controller switching equipment local discharge on-line monitoring device; be characterized in, above-mentioned transient state ground voltage signal condition unit comprises: prime protection buffer circuit, bandpass filter, logarithmic amplifier, detection shaping circuit, sef-adapting filter and conditioned signal output circuit are connected in series composition successively.
Above-mentioned intrusive mood controller switching equipment local discharge on-line monitoring device, be characterized in, above-mentioned ultrasonic signal conditioning unit comprises: coupling coupled circuit, linear amplifier circuit, bandpass filter, logarithmic amplifier, detection shaping circuit, match circuit and conditioned signal output circuit are connected in series composition successively.
Above-mentioned intrusive mood controller switching equipment local discharge on-line monitoring device, be characterized in, above-mentioned ultrasonic signal monitoring unit comprises: coupling coupled circuit, linear amplifier and the first bandpass filter are connected in series successively, oscillator, attenuator and the second bandpass filter are connected in series successively, the output terminal of the output terminal of the first above-mentioned bandpass filter, the second above-mentioned bandpass filter is connected with the input end of Analogue mixer respectively, and above-mentioned Analogue mixer, the 3rd bandpass filter, audio drive circuitry, audio output circuit are connected in series successively.
The present invention compared with prior art has the following advantages: all components such as the sensing unit of this device and monitoring main frame are the embedded controller switching equipment inside that is installed on all, transient state ground voltage signal and ultrasonic signal that transient state ground voltage sensing unit and supersonic sensing unit produce for obtaining shelf depreciation, two paths of signals transfers to monitoring main frame through high-frequency signal transmission wire, and monitoring main frame settling signal is processed and monitoring result is intuitively shown in numerical value mode.By ultrasonic signal monitoring unit, by equipment of raising one's voice such as earphones, realize ultrasonic signal and monitor.Observation process automatically, in real time, complete continuously, without manual intervention, is effectively realized fast inspection, reduces patrol officer and drops into, and reduces and patrols and examines labour intensity.
Accompanying drawing explanation
Fig. 1 is the functional structure schematic diagram of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Fig. 2 is the transient state ground voltage sensing unit schematic diagram of the function of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Fig. 3 is the excretion disposal structural representation of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Fig. 4 is the supersonic sensing Elementary Function schematic diagram of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Fig. 5 is the ultrasonic sensor structural representation of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Fig. 6 is the transient state ground voltage conditioning unit schematic diagram of the function of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Fig. 7 is the ultrasonic signal conditioning unit schematic diagram of the function of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Fig. 8 is the ultrasound wave monitoring unit schematic diagram of the function of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Fig. 9 is the display unit schematic diagram of the function of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Figure 10 is the power supply unit schematic diagram of the function of a kind of intrusive mood controller switching equipment of the present invention local discharge on-line monitoring device.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As shown in Figure 1, a kind of intrusive mood controller switching equipment local discharge on-line monitoring device, is characterized in, comprises sensing unit 1 and monitoring host computer 2; Above-mentioned sensing unit 1 is comprised of transient state ground voltage sensing unit 11 and supersonic sensing unit 12; Above-mentioned monitoring host computer 2 is comprised of signal condition unit 21, signal processing unit 22, display unit 23, ultrasonic signal monitoring unit 24 and power supply unit 25.
Above-mentioned transient state ground voltage sensing unit 11 and above-mentioned supersonic sensing unit 12, be connected with a plurality of input ends of above-mentioned signal condition unit 21 respectively, a plurality of output terminals of above-mentioned signal condition unit 21 are connected with above-mentioned signal processing unit 22, above-mentioned ultrasonic signal monitoring unit 24 respectively; The output terminal of above-mentioned signal processing unit 22 is connected with above-mentioned display unit 23; Above-mentioned power supply unit 25 is connected with above-mentioned signal condition unit 21, signal processing unit 22, display unit 23, ultrasonic signal monitoring unit 24 respectively, and working power is provided; Above-mentioned sensing unit 1 obtains transducing signal, and above-mentioned monitoring host computer 2 receives the detection signal of this sensing unit 1.
The included CPU of above-mentioned signal processing unit 22, design parameter requires to comprise: 16 and 16 above microprocessors, have more than 32K byte flash memory program's memory space, have abundant I/O interface; For example PIC is serial, STM series microprocessor.The included A/D module of this signal processing unit 22 can be CPU integration module, also can select independent A/D module, and the figure place that requires A/D module is more than 10 and 10, and sampling rate is greater than 500KHz.
As shown in Figure 2, a kind of intrusive mood controller switching equipment local discharge on-line monitoring device transient state ground voltage sensing unit 11 comprises: excretion disposal 111, signal-transmitting cable 112 and impedance matching connector 113; Above-mentioned excretion disposal 111 obtains transient state ground voltage transducing signal, and is connected with above-mentioned impedance matching connector 113 by above-mentioned signal-transmitting cable 112.This impedance matching connector 113 receives the detection signal of this excretion disposal 111 by this signal-transmitting cable 112.
In the present embodiment, selecting model is that the coaxial cable for high frequency of RG174 is as above-mentioned signal-transmitting cable 112; Selecting model is that the 50 Ω impedance matching connectors of SMA or SMB or BNC are as above-mentioned impedance matching connector 123.
As shown in Figure 3, a kind of transient state ground voltage sensing unit of intrusive mood controller switching equipment local discharge on-line monitoring device, when high-tension switch cabinet generation shelf depreciation, the discharge electricity amount of electrified body 31 is first gathered in the grounded metal part close with point of discharge, form current impulse, to all directions, propagate, because the electromagnetic wave of discharge generation blazes abroad by the seam crossing of metal cabinet or the liner of gas-insulated switch, produce a transient state voltage-to-ground (i.e. " transient state ground voltage ") simultaneously, transient state voltage-to-ground is generally between tens millivolts～several volts and can only maintain several nanoseconds (ns).By being arranged on the capacitive coupling formula sensor 111 in the grounded metal enclosure 32 of equipment under test, discharge pulse signal can be detected, obtain the parameters such as the amplitude of this pulse signal and frequency.Capacitive coupling formula sensor 111 is similar to RF coupling condenser; sensor insulation course 1111 has insulation and the double effects of protecting; in the grounded metal enclosure 32 of equipment under test, the variation meeting of transient state voltage-to-ground induces high-frequency current on the metal polar plate of sensor main body 1112; by sensor, drawing interface 1113 is connected with its treatment facility; high-frequency current to sensor main body 1112 outputs is processed, and can indirectly obtain intensity and the frequency of shelf depreciation.
As shown in Figure 4, a kind of supersonic sensing unit 12 of intrusive mood controller switching equipment local discharge on-line monitoring device comprises: ultrasonic sensor 121, signal-transmitting cable 122 and impedance matching connector 123; Above-mentioned ultrasonic sensor 121 obtains ultrasonic signal, and is connected with above-mentioned impedance matching connector 123 by above-mentioned signal-transmitting cable 122.This impedance matching connector 123 receives the detection signal of this ultrasonic sensor 121 by above-mentioned signal-transmitting cable 122.
As shown in Figure 5, above-mentioned supersonic sensing unit 12 is passive sensing unit, above-mentioned ultrasonic sensor 121, utilize the principle of piezoelectric effect, adopt a kind of piezoceramic material of twin crystal oscillator structure, on the specific direction of piezoelectric ceramics, exerting pressure, just there is strain in piezoelectric ceramics, produces the voltage that one side is negative pole for anodal another side.Piezoelectric ceramics is by special technique and cutting, have fixing resonance frequency and a bandwidth, different piezoelectric ceramics can be the most responsive to different characteristic frequency, and have certain bandwidth, so can produce the sensor of different crest frequencies and bandwidth, to adapt to different testing requirements.
In the present embodiment, because the ultrasonic signal of controller switching equipment discharge generation concentrates on 20KHz-50KHz, selecting centre frequency is the ultrasonic sensor of 40KHz, selects NU40C10R-1 type ultrasonic sensor; Selecting model is that the coaxial cable for high frequency of RG174 is as above-mentioned signal-transmitting cable 122; Selecting model is that the impedance matching connector of 50 Ω of SMA or SMB is as above-mentioned impedance matching connector 123.
As shown in Figure 1, a kind of signal condition unit 21 of intrusive mood controller switching equipment local discharge on-line monitoring device comprises: transient state ground voltage signal condition unit 211 and ultrasonic signal conditioning unit 212, the input end of above-mentioned transient state ground voltage signal condition unit 211, the input end of above-mentioned ultrasonic signal conditioning unit 212 respectively with the output terminal of above-mentioned transient state ground voltage sensing unit 11, the output terminal of above-mentioned supersonic sensing unit 12 is connected, the output terminal of above-mentioned transient state ground voltage signal condition unit 211, output terminal of above-mentioned ultrasonic signal conditioning unit 212 is connected with a plurality of input ends of above-mentioned signal processing unit 22, another output terminal of above-mentioned ultrasonic signal conditioning unit 212 is connected with above-mentioned ultrasonic signal monitoring unit 24.
As shown in Figure 6, a kind of transient state ground voltage signal condition unit 211 of intrusive mood controller switching equipment local discharge on-line monitoring device comprises: prime protection buffer circuit 2111, bandpass filter 2112, logarithmic amplifier 2113, detection shaping circuit 2114, sef-adapting filter 2115 and conditioned signal output circuit 2116 are connected in series composition successively.Above-mentioned prime protection buffer circuit 2111 obtains the detection signal of above-mentioned transient state ground voltage sensing unit 11; this detection signal carries out filtering by bandpass filter 2112; filtered signal amplifies through above-mentioned logarithmic amplifier 2113; be transferred to detection shaping circuit 2114; above-mentioned sef-adapting filter 2115 carries out filtering after obtaining the output end signal of this detection shaping circuit 2114, and filtered signal is transferred to conditioned signal output circuit 2116.
In the present embodiment, the design parameter of logarithmic amplifier 2113 requires to comprise: input dynamic range is greater than 70dB, is less than 4nS instantaneous recovery time, and band is wider than 200MHz.Sef-adapting filter 2115 is to take the modular circuit that operational amplifier builds as core, and this operational amplifier need meet design parameter requirement and comprise: band is wider than 200MHz, low noise, and input impedance is greater than 10M Ω.
As shown in Figure 7, a kind of ultrasonic signal conditioning unit 212 of intrusive mood controller switching equipment local discharge on-line monitoring device comprises: coupling coupled circuit 2121, linear amplifier circuit 2122, bandpass filter 2123, logarithmic amplifier 2124, detection shaping circuit 2125, match circuit 2126 and conditioned signal output circuit 2127 are connected in series composition successively.The coupling coupled circuit 2121 that obtains above-mentioned supersonic sensing unit 12 processing signals is connected with above-mentioned linear amplifier circuit 2122, the bandpass filter 2123 of passing through through amplifying signal is carried out filtering, filtered signal is transferred to above-mentioned logarithmic amplifier 2124, signal after amplification is transferred to above-mentioned detection shaping circuit 2125, above-mentioned match circuit 2126 obtains the output end signal of this detection shaping circuit 2125 and processes, and treated signal is transferred to conditioned signal output circuit 2127.
In the present embodiment, the design parameter of above-mentioned logarithmic amplifier 2124 requires to comprise: input dynamic range is greater than 80dB, is less than 4nS instantaneous recovery time.The design parameter requirement of above-mentioned linear amplifier circuit 2122 comprises that voltage bias is less than 40uV, and temperature drift is less than 0.5 μ v/C, and common-mode rejection ratio is greater than 120dB.
As shown in Figure 8, a kind of ultrasonic signal monitoring unit 24 of intrusive mood controller switching equipment local discharge on-line monitoring device comprises: coupling coupled circuit 2411, linear amplifier 2412 and the first bandpass filter 2413 are connected in series successively, oscillator 2414, attenuator 2415 and the second bandpass filter 2416 are connected in series successively, the output terminal of the first above-mentioned bandpass filter 2413, the output terminal of the second above-mentioned bandpass filter 2416 is connected with the input end of Analogue mixer 2417 respectively, above-mentioned Analogue mixer 2417, the 3rd bandpass filter 2418, audio drive circuitry 2419, audio output circuit 2420 is connected in series successively.Above-mentioned coupling coupled circuit 2411 obtains the detection signal of above-mentioned ultrasonic signal conditioning unit 212, this detection signal carries out linearity through above-mentioned linear amplifier 2412 and amplifies, signal after amplification is transferred to the first bandpass filter 2413 and carries out filtering, through filtered signal, is transferred to above-mentioned Analogue mixer 2417; The output terminal of above-mentioned oscillator 2414 is connected with the input end of above-mentioned attenuator 2415, and the second bandpass filter 2416 is obtained the output end signal of this attenuator 2415 and carried out filtering, and filtered signal is transferred to above-mentioned Analogue mixer 2417; The output end signal of 2418 pairs of Analogue mixers 2417 of the 3rd bandpass filter carries out filtering, and filtered signal is transferred to above-mentioned, and the output end signal of processing through this audio drive circuitry 2419, is transferred to above-mentioned audio output circuit 2420.
Above-mentioned ultrasonic signal monitoring unit 24 is to utilize superhet principle, by ultrasonic signal and intrinsic signals mixing, high-frequency signal is reduced to the low frequency signal that people's ear can be heard, can identify.For example, the ultrasonic signal of 40KHz is reduced to 1KHz, requires above-mentioned oscillator 2414 to produce the signal of 39KHz.
In the present embodiment, the design parameter of above-mentioned linear amplifier 2412 requires to comprise: voltage bias is less than 40uVdB, and temperature drift is less than 0.5 μ v/C, and common-mode rejection ratio is greater than 120dB.Above-mentioned Analogue mixer 2417 will meet that input dynamic range is large, the requirement of two power voltage supplies.
As shown in Figure 9, a kind of display unit 23 of intrusive mood controller switching equipment local discharge on-line monitoring device comprises: scrambler 231 and charactron display unit 232; Above-mentioned scrambler 231 obtains the output signal of above-mentioned signal processing unit 22, and this scrambler 231 is connected with above-mentioned charactron display unit 232.
In the present embodiment, CPU encodes according to the coding rule of this scrambler 231, lights the charactron of this charactron display unit 232.This display unit 23 intuitively shows in numerical value mode for signal processing unit 22 is processed to the local discharge characteristic data that obtain, and these local discharge characteristic data comprise the amplitude, the pulse number of transient state ground voltage in 1s of hyperacoustic maximum amplitude, transient state ground voltage etc.
As shown in figure 10, a kind of power supply unit of intrusive mood controller switching equipment local discharge on-line monitoring device comprises: switch power module 251 and low-pass filter 252; Above-mentioned switch power module 251 obtains the 220VAC/110VDC of power supply end input, and the output end signal after this switch power module 251 is processed is transferred to above-mentioned low-pass filter 252 and processes, output power supply ± 5V.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.Those skilled in the art, read after foregoing, for multiple modification of the present invention with to substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (7)
1. an intrusive mood controller switching equipment local discharge on-line monitoring device, is characterized in that, comprises sensing unit (1) and monitoring host computer (2); Described sensing unit (1) is comprised of transient state ground voltage sensing unit (11) and supersonic sensing unit (12); Described monitoring host computer (2) is comprised of signal condition unit (21), signal processing unit (22), display unit (23), ultrasonic signal monitoring unit (24) and power supply unit (25);
Described transient state ground voltage sensing unit (11) and described supersonic sensing unit (12), be connected with a plurality of input ends of described signal condition unit (21) respectively, a plurality of output terminals of described signal condition unit (21) are connected with described signal processing unit (22), described ultrasonic signal monitoring unit (24) respectively; The output terminal of described signal processing unit (22) is connected with described display unit (23); Described power supply unit (25) is connected with described signal condition unit (21), signal processing unit (22), display unit (23), ultrasonic signal monitoring unit (24) respectively, and working power is provided; Described sensing unit (1) obtains transducing signal, and described monitoring host computer (2) receives the detection signal of this sensing unit (1).
2. intrusive mood controller switching equipment local discharge on-line monitoring device as claimed in claim 1, it is characterized in that, described transient state ground voltage sensing unit (11) comprising: excretion disposal (111), signal-transmitting cable (112) and impedance matching connector (113); Described excretion disposal (111) is connected with described impedance matching connector (113) by described signal-transmitting cable (112).
3. intrusive mood controller switching equipment local discharge on-line monitoring device as claimed in claim 1, it is characterized in that, described supersonic sensing unit (12) comprising: ultrasonic sensor (121), signal-transmitting cable (122) and impedance matching connector (123); Described ultrasonic sensor (121) is connected with described impedance matching connector (123) by described signal-transmitting cable (122).
4. intrusive mood controller switching equipment local discharge on-line monitoring device as claimed in claim 1, is characterized in that, described signal condition unit (21) comprising: transient state ground voltage signal condition unit (211) and ultrasonic signal conditioning unit (212), the input end of described transient state ground voltage signal condition unit (211), the input end of described ultrasonic signal conditioning unit (212) respectively with the output terminal of described transient state ground voltage sensing unit (11), the output terminal of described supersonic sensing unit (12) is connected, the output terminal of described transient state ground voltage signal condition unit (211), output terminal of described ultrasonic signal conditioning unit (212) is connected with a plurality of input ends of described signal processing unit (22), another output terminal of described ultrasonic signal conditioning unit (212) is connected with described ultrasonic signal monitoring unit (24).
5. intrusive mood controller switching equipment local discharge on-line monitoring device as claimed in claim 4; it is characterized in that, described transient state ground voltage signal condition unit (211) comprising: prime protection buffer circuit (2111), bandpass filter (2112), logarithmic amplifier (2113), detection shaping circuit (2114), sef-adapting filter (2115) and conditioned signal output circuit (2116) are connected in series composition successively.
6. intrusive mood controller switching equipment local discharge on-line monitoring device as claimed in claim 4, it is characterized in that, described ultrasonic signal conditioning unit (212) comprising: coupling coupled circuit (2121), linear amplifier circuit (2122), bandpass filter (2123), logarithmic amplifier (2124), detection shaping circuit (2125), match circuit (2126) and conditioned signal output circuit (2127) are connected in series composition successively.
7. intrusive mood controller switching equipment local discharge on-line monitoring device as claimed in claim 4, it is characterized in that, described ultrasonic signal monitoring unit (24) comprising: coupling coupled circuit (2411), linear amplifier (2412) and the first bandpass filter (2413) are connected in series successively, oscillator (2414), attenuator (2415) and the second bandpass filter (2416) are connected in series successively, the output terminal of described the first bandpass filter (2413), the output terminal of described the second bandpass filter (2416) is connected with the input end of Analogue mixer (2417) respectively, described Analogue mixer (2417), the 3rd bandpass filter (2418), audio drive circuitry (2419), audio output circuit (2420) is connected in series successively.
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| CN104360252A (en) * | 2014-12-03 | 2015-02-18 | 国家电网公司 | Acoustic and electric signal acquiring device and method of multichannel switch cabinet |
| CN104991176A (en) * | 2015-07-22 | 2015-10-21 | 广州供电局有限公司 | Signal conditioning circuit for ultrahigh frequency sensor |
| CN105699865A (en) * | 2016-01-29 | 2016-06-22 | 张波 | An insulation characteristic detection method and a system thereof |
| CN106291279A (en) * | 2016-08-03 | 2017-01-04 | 中国电力科学研究院 | A kind of system and method eliminating external disturbance based on omnidirectional's UHF noise transducer |
| CN106841939A (en) * | 2016-12-23 | 2017-06-13 | 西安交通大学 | The portable acoustoelectric combined detection means of GIS partial discharge and its detection method |
| CN106841946A (en) * | 2017-02-14 | 2017-06-13 | 吴笃贵 | A kind of combined local discharge of electrical equipment live detection equipment |
| CN106970306A (en) * | 2017-04-07 | 2017-07-21 | 亿科电气股份有限公司 | A kind of partial discharge of switchgear monitoring system and monitoring method |
| CN110554293A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | partial discharge signal processing device |
| CN110687420A (en) * | 2019-11-15 | 2020-01-14 | 河南宏博测控技术有限公司 | Split type partial discharge detection device |
| CN111579945A (en) * | 2020-05-21 | 2020-08-25 | 华乘电气科技股份有限公司 | Integrated switch cabinet partial discharge intelligent sensor and information fusion state evaluation method thereof |
| CN112630604A (en) * | 2020-11-13 | 2021-04-09 | 广东电网有限责任公司广州供电局 | Partial discharge detection device based on capacitive sensor |
| CN112462214A (en) * | 2020-11-26 | 2021-03-09 | 云南电网有限责任公司电力科学研究院 | Intelligent sensing terminal for partial discharge |
| CN112462214B (en) * | 2020-11-26 | 2023-01-20 | 云南电网有限责任公司电力科学研究院 | Intelligent sensing terminal for partial discharge |
| CN113702685A (en) * | 2021-08-31 | 2021-11-26 | 西安交通大学 | Piezoelectric type ultrasonic-transient earth voltage composite sensor and measuring device |
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Address after: 200002 Nanjing East Road, Shanghai, No. 181, No. Co-patentee after: Red phase Limited by Share Ltd Patentee after: State Grid Shanghai Municipal Electric Power Company Address before: 200002 Nanjing East Road, Shanghai, No. 181, No. Co-patentee before: Xiamen Red Phase Instruments Inc. Patentee before: State Grid Shanghai Municipal Electric Power Company |