CN203350430U - Detection system for GIS (gas insulated switchgear) partial discharge detection sensor - Google Patents
Detection system for GIS (gas insulated switchgear) partial discharge detection sensor Download PDFInfo
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- CN203350430U CN203350430U CN 201320426221 CN201320426221U CN203350430U CN 203350430 U CN203350430 U CN 203350430U CN 201320426221 CN201320426221 CN 201320426221 CN 201320426221 U CN201320426221 U CN 201320426221U CN 203350430 U CN203350430 U CN 203350430U
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Abstract
The utility model provides a detection system for a GIS (gas insulated switchgear) partial discharge detection sensor. The detection system comprises a GIS tank body, a high-voltage bushing, a grading ring, a built-in camera, a GIS partial discharge model, a standard UHF sensor, a UHF sensor to be tested, an ultrasonic signal injection port, a UHF signal injection port, an ultrasonic sensor, an ultrasonic partial discharge positioning system and a UHF partial discharge positioning system. The system helps to solve the problems of performance difference comparison of the ultrasonic sensors and the ultra-high frequency (UHF) sensors of various manufacturers and the performance comparison of the GIS partial discharge detection systems of various manufacturers.
Description
Technical field
The utility model relates to the system in a kind of intelligent electric appliance field, specifically relates to the detection check system of a kind of gas insulated combined electrical equipment (GIS) partial discharge detecting sensor based.
Background technology
Because having, floor area is little, maintenance workload is few, insulating property are good, high reliability is widely used in the high voltage power transmission field for gas insulated combined electrical equipment (gas insulated switchgear, GIS).Along with the continuous increase of line voltage grade and power system capacity, the internal fault of GIS equipment also increases thereupon, when GIS breaks down, maintenance is complicated, and repair time is long, and influence area is large, consequence is serious, and the method for therefore finding Efficient Evaluation GIS internal state is particularly important.The main detection by shelf depreciation is achieved in the world at present.Shelf depreciation (office puts) signal has comprised abundant state of insulation information, the defect of introducing in GIS manufacture and installation process can not only be detected, and can effectively detect generation and the order of severity of insulation fault in on-line monitoring, measurement of partial discharge is the important means of insulation state monitoring.Shelf depreciation is not only the apparatus insulated deteriorated tendency of GIS and the form of expression, and can cause the further deteriorated of insulation, causes the electrical insulation properties of GIS to reduce, and finally causes insulation breakdown or edge flashing.The identification of the GIS shelf depreciation order of severity is the difficult problem of hanging and not separating with assessment always, is that the GIS internal state is assessed problem anxious to be resolved.
Pulse current method is to detect the most frequently used method of shelf depreciation, it is also current unique quantitative detecting method with international standard (IEC 60270), the pulse current that the method produces by the measurement shelf depreciation is detected in the pulse voltage that detects the response of impedance two ends, be characterized in keeping good transport property in very wide frequency range, and there is the plurality of advantages such as highly sensitive, that discharge capacity can be demarcated.That yet its shortcoming is survey frequency is lower, be subject to electromagnetic interference (EMI), can't effectively be applicable to field monitoring.At present the office of GIS puts that detection method mainly contains the ultrasonic partial discharge detection method and detection method is put in ultrahigh frequency (UHF) office.
Partial Discharge Detection based on supercritical ultrasonics technology is a kind of to very important, the nondestructive detection means of power equipment.The inner generation of power equipment office shows as a gas breakdown among a small circle while putting, and the mutual shock of gas molecule can produce ultrasonic pulse, and the sound wave spectrum that different electrical equipments, environmental baseline and insulation status produce is not identical.In GIS along SF.Gas is propagated only has compressional wave, and, in the GIS outer chamber, not only can propagate shear wave but also can propagate compressional wave.The ultrasound wave that in GIS, shelf depreciation excites can be regarded as in the mode of point source and propagates to surrounding, because hyperacoustic wavelength is shorter, thereby its directivity is strong, energy is comparatively concentrated, the ultrasonic signal produced in the time of can collecting electric discharge by the sonac of outer wall is also analyzed it.
Partial Discharge Detection based on ultrahigh frequency (UHF) method is to utilize to be installed in that the inner or outside ultra-high frequency antenna (sensor) of GIS receives local discharge excitation and the UHF signal of 300～3000MHz frequency range of propagating carries out determination and analysis.The method has that to detect frequency range high, has good antijamming capability, measurement bandwidth is wide, detection sensitivity is high, can be used for the advantages such as source of trouble location and fault type recognition.
At present, domestic there is no measured sonac and superfrequency (UHF) pick up calibration standard for the GIS shelf depreciation, causes that sonac and superfrequency (UHF) sensor performance difference between each producer can't compare, the GIS office between each producer puts the problem that the detection system performance can't compare.
Summary of the invention
For the problems referred to above, the utility model provides the detection check system of a kind of gas insulated combined electrical equipment (GIS) partial discharge detecting sensor based, by detection check system of the present utility model, the Performance Evaluation for GIS shelf depreciation sonac and ultrahigh frequency (UHF) sensor and the detection and location system that formed by it that can realize each manufacturing firm is produced.
Realize that the solution that above-mentioned purpose adopts is:
A kind of detection system of local discharge of gas-insulator switchgear detecting sensor, described system comprises the GIS tank body of horizontal positioned, its improvements are: bushing and lower end vertical with described GIS tank body is communicated with, and described bushing upper end is provided with grading ring; Described GIS tank surface is provided with tensimeter and charges and discharge valve, the built-in coupling condenser of described GIS tank body, and described coupling condenser is connected with the binding post that the GIS tank surface is installed;
Described GIS tank body external vertical connects two pairs of symmetrical GIS shelf depreciation models of placing, and described GIS shelf depreciation model top is provided with the infrared high-definition camera of observing GIS tank interior situation;
The GIS tank surface of the first side of described shooting is provided with standard UHF gauge hole and UHF gauge hole to be measured, described standard UHF gauge hole and UHF gauge hole to be measured are on same axis, and described GIS tank body one end is provided with ultrasonic signal inlet and UHF signal injection mouth.
Further, described binding post is put pick-up unit and is connected with office;
Further, described GIS shelf depreciation model is push-down GIS shelf depreciation model, when changing model, the push rod of corresponding model is operated and described operation does not change the impermeability of GIS tank body.
Further, sonac is affixed on described GIS tank surface.
Further, the ultrasound partial discharge positioning system connects described sonac; UHF partial discharge location system connects described UHF sensor to be measured, described standard UHF sensor and described UHF signal injection mouth.
Further, the measurement terminal of described sensor is connected with oscillograph.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model is by the detection check system, the Performance Evaluation for GIS shelf depreciation sonac and ultrahigh frequency (UHF) sensor and the detection and location system that consists of it that can realize each manufacturing firm is produced.
(2) the utility model adopts push-down GIS shelf depreciation model, needn't repeatedly carry out the inflation/deflation operation to tank body when changing model, only the push rod of corresponding model need to be operated and this operation does not change the impermeability of GIS tank body, do not affected the accuracy of test data.
(3) pass through the to be measured and standard transducer of contrast in the utility model, show by same oscillograph or positioning system, result is more accurately directly perceived, better effects if.
(4) the utility model can be by the difference of discharging model, apply voltage and produce shelf depreciation, measure the ultrasonic signal spectrogram of different electric discharge types, set up experts database after pattern recognition, for follow-up GIS partial discharges fault type diagnosis provides identification comparison source, for identifying the different insulative defect type.
(5) the utility model is by the difference of discharging model, apply voltage and produce shelf depreciation, measure the UHF spectrogram of different electric discharge types, building database after pattern recognition, for follow-up GIS partial discharges fault type diagnosis provides identification comparison source, for identifying the different insulative defect type.
(6) the detection check system of the GIS shelf depreciation UHF sensor that the utility model provides, put the present situation of relevant criterion of Performance Detection, the evaluation of UHF sensor for the current domestic GIS of there is no office, the formulation of industry standard is from now on had to reference value.
(7) the detection check system of the GIS shelf depreciation UHF sensor that the utility model provides, be applicable to the occasion that other adopt UHF sensor detection office to put, as transformer partial discharge UHF detects etc.
The accompanying drawing explanation
Fig. 1 is that the GIS shelf depreciation is ultrasonic, UHF sensor detection check system front elevation;
Fig. 2 is that the GIS shelf depreciation is ultrasonic, UHF sensor detection check system side view;
Fig. 3 is that the GIS shelf depreciation is ultrasonic, UHF sensor localization system detection check system diagram;
Wherein, 1-GIS shelf depreciation model; The 2-bushing; The 3-grading ring; The 4-disc insulator; The 5-built-in camera; 6-GIS shelf depreciation model; 7-standard UHF sensor; 8-UHF sensor to be measured; 9-ultrasonic signal inlet; 10-UHF signal injection mouth; The 11-sonac; 12-ultrasound partial discharge positioning system; 13-UHF partial discharge location system; The 14-push rod.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
As shown in Figure 1, Fig. 1 is that the GIS shelf depreciation is ultrasonic, UHF sensor detection check system front elevation; In figure, the GIS shelf depreciation is ultrasonic, UHF sensor detection check system comprises GIS tank body, bushing, grading ring, disc insulator, built-in camera, GIS shelf depreciation model, standard UHF sensor, UHF sensor to be measured, ultrasonic signal inlet and UHF signal injection mouth.
The GIS tank body is communicated with the vertical also lower end of bushing, and the bushing upper end is provided with grading ring, and the GIS tank body is provided with disc insulator in bushing both sides and standard UHF sensor, UHF sensor symmetria bilateralis to be measured; The GIS tank surface at the symmetrical place of bushing is provided with supporting seat; GIS tank surface between disc insulator is provided with tensimeter and charges and discharge valve, and both sides are built-in coupling condenser and GIS shelf depreciation model respectively, and coupling condenser is connected with the binding post that GIS tank body outside surface is installed; GIS shelf depreciation model is the discharging model that two pairs of symmetries vertically connect GIS tank body outside; GIS shelf depreciation model top is provided with the infrared high-definition camera of observing GIS tank interior situation, camera is provided with standard UHF sensor and UHF installation of sensors end to be measured on one side, during measurement, standard UHF sensor and UHF sensor to be measured are installed on respectively standard UHF gauge hole and UHF gauge hole to be measured, and described standard UHF gauge hole and UHF gauge hole to be measured are on the same axis of GIS tank body; While measuring, described standard UHF sensor and UHF sensor to be measured are on the unified axis of tank body; GIS tank body one end is provided with ultrasonic signal inlet and UHF signal injection mouth.Wherein, binding post is put pick-up unit and is connected with office.
As shown in Figure 2, Fig. 2 is that the GIS shelf depreciation is ultrasonic, UHF sensor detection check system side view; GIS shelf depreciation model is push-down GIS shelf depreciation model, the GIS tank body is before being filled with SF6 gas, push-down GIS shelf depreciation model is placed in to tank body, put model owing to being furnished with a plurality of GIS office in the GIS tank body, single test is just to a kind of or several test the in these models, when the GIS shelf depreciation model to selected is tested, only corresponding push rod need be pushed ahead, pushrod movement does not affect the whole impermeability of GIS tank body.Whether by built-in camera, observe model is in place.GIS tank body outside surface is equipped with binding post, and it is connected with the built-in coupling condenser of GIS tank body, can put checkout equipment with office and be connected the detection Partial discharge signal; The GIS tank surface is equipped with tensimeter for monitoring the SF6 gaseous tension, charges and discharge valve for to the GIS tank interior, being filled with or extracting out SF6 gas.
In GIS type local-discharge ultrasonic sensor detection check system, sonac to be measured and standard ultrasound sensor are arranged symmetrically with the surface with the GIS tank body.Can produce ultrasonic signal during GIS shelf depreciation model generation shelf depreciation, by comparing of sonac measuring-signal to be measured and standard ultrasound sensor measurement signal, assess the performance of sensor to be measured.In addition, can inject the known ultrasonic signal of a characteristic to the GIS tank interior at ultrasonic signal inlet 9, by comparing of sonac measuring-signal to be measured and standard ultrasound sensor measurement signal, assess the performance of sensor to be measured.
GIS office puts in UHF sensor detection check system, and UHF sensor to be measured and standard UHF installation of sensors are at the assigned address of GIS tank body.The UHF signal can be produced during GIS shelf depreciation model generation shelf depreciation, by comparing of UHF sensor measuring-signal to be measured and standard UHF sensor measurement signal, the performance of sensor to be measured can be assessed.In addition, can inject the known UHF signal of a characteristic to the GIS tank interior at UHF signal injection mouth 10, by comparing of UHF sensor measurement signal to be measured and standard UHF sensor measurement signal, can assess the performance of sensor to be measured.
As shown in Figure 3, Fig. 3 is that the GIS shelf depreciation is ultrasonic, UHF sensor localization system detection check system diagram; This system also comprises ultrasound partial discharge positioning system 12 and UHF partial discharge location system 13; During test, sonac 11 is affixed on described GIS tank surface; Ultrasound partial discharge positioning system 12 connects sonac; UHF partial discharge location system 13 connects UHF sensor to be measured, standard UHF sensor and UHF signal injection mouth.The measurement terminal of sonac and UHF sensor is connected with oscillograph.This detection check system is measured the reference coordinate of its relative tank body record when typical GIS discharging model is installed.The electric discharge that different discharging models can be used for simulating different coordinate points, the quantity of sonac 11 and position Ke You producer are selected, sensor is connected to positioning system by feeder line, carry out error test is carried out to the actual discharge position in the ultrasound positioning system location, the sensitivity of detection check positioning system (much offices high-volume can carry out detection and localization) and positional accuracy.Before UHF positioning system detection check, need be by UHF installation of sensors and UHF sensor to be checked 8 positions, hole, UHF signal injection mouth 10 is equipped with a UHF sensor emission UHF signal, and when test condition needs (as carried out the UHF Position Research), this position, hole also can be installed other (as location) and be used the UHF sensor.
The GIS shelf depreciation is ultrasonic, the corresponding GIS shelf depreciation Ultrasonic Detection method of calibration of UHF sensor detection check system and UHF sensor detection check method; Wherein,
GIS shelf depreciation Ultrasonic Detection method of calibration comprises two kinds of methods;
Method one comprises the following steps: ultrasonic signal inlet 9 injects the known ultrasonic signal of waveform characteristic, sonac to be measured and standard ultrasound sensor are symmetrically distributed in to GIS tank body 1 surface, both measurement terminal are connected with oscillograph, by both measurement result compare of analysis, with detection check sonac to be measured in the situation that the known performance situation of supersonic source characteristic.
Method two comprises the following steps: outside by bushing 2 pressurizations, the excitation ultrasound signal is put in GIS shelf depreciation model 16 generation offices, sonac to be measured and standard ultrasound sensor are symmetrically distributed in to GIS tank body 1 surface, both measurement terminal are connected with oscillograph, by both measurement result compare of analysis, with detection check sonac to be measured in the situation that the performance situation that similar actual GIS office puts.
The sensitivity of standard transducer is known, by the excitation of same supersonic source (office puts and excites), contrasts the testing result of sonac to be checked and standard transducer, both can obtain sensitivity.
Native system can be by the difference of discharging model, apply voltage and produce shelf depreciation, measure the ultrasonic signal spectrogram of different electric discharge types, set up experts database after pattern recognition, for follow-up GIS partial discharges fault type diagnosis provides identification comparison source, for identifying the different insulative defect type.
GIS shelf depreciation UHF sensor detection check method;
The UHF transducer sensitivity is the important parameter of GIS partial discharge monitoring system, utilizes GIS shelf depreciation UHF sensor detection check system, can realize that the UHF transducer sensitivity detects, and comprises following:
Step 1: adopt discharging model for the Simulated GlS partial discharges fault in the GIS tank interior, by grading ring, to GIS shelf depreciation model pressurization electric discharge, produce partial discharges fault.
Due to different faults type, dissimilar sensor, diverse location, the spectrogram that UHF is measured all impacts; Therefore, when carrying out the work of UHF sensor detection check, need clearly above-mentioned three kinds of variablees (being fault type, sensor type, sensing station) as far as possible, usually get same discharge fault type, same type sensor is compared, during system, the UHF sensing station is fixed.
GIS fault simulation platform can realize that the UHF sensor is in the close positions test of comparing, and by the GIS shelf depreciation model selected, by its push rod 14 fix in position, the pull bar of other models is corresponding pulls out.Described other models refer to be built in the GIS tank interior, but do not participate in the model of this local discharge test, as, when the left side model is tested, push away the pull bar in left side, and do not advance right side and the symmetrical push rod of two of surveying.
Step 2: when local discharge fault occurs, the spectrogram simultaneously received by the oscillograph recording two sensors, deposit this spectrogram in computing machine; Obtain tangible discharge capacity by Partial discharge detector; The arrangement of two UHF sensors is installed on respectively UHF gauge hole to be measured and standard UHF gauge hole.
Step 3: adopt millimicrosecond pulse generator, by UHF signal injection mouth 10, inject artificial partial discharge pulse, receive spectrogram by oscillograph recording UHF sensor, and spectrogram is deposited into to computing machine; Obtain Apparent discharge magnitude by Partial discharge detector.
Step 4: compare with the spectrogram of UHF sensor record in the first step, and change amplitude and the rise time of millimicrosecond pulse generator by adjustment, making spectrogram comparison error is in ± 20%, the millimicrosecond pulse generator of now adjusting is as the reignition impulse source, and the frequency of reignition impulse source can be 50HZ;
Step 5: the millimicrosecond pulse generator of setting up by above-mentioned test and the relation between partial discharge quantity (pC), adopt the good millimicrosecond pulse generator of adjusted can repeat to produce the Apparent discharge magnitude of confirming before this, for UHF sensor of the same type to be detected or be arranged on the sensor on on-the-spot GIS, the reignition pulse is injected to the GIS tank interior, UHF sensor to be checked and standard UHF sensor testing result are compared, if spectrogram detected, illustrate that this sensor has the sensitivity detectability of regulation.
Stipulate an Apparent discharge magnitude herein, by sensing chamber to the adjustment of discharging model, the office of making puts Apparent discharge magnitude and reaches lower, detects more highly sensitive UHF sensor.When sensor to be checked meets the UHF sensor Fixture Design of GIS partial discharges fault analogue means, can realize the detection check of number of different types sensor.
Step 6: obtain spectrogram, the sensitivity behaviour that comparative analysis UHF sensor has.
Sensitivity detection method can detect the minimum sensitivity value of UHF sensor in sensing chamber, simultaneously by the debugging that artificial nanosecond pulse source can be used for on-the-spot mounted UHF pick up calibration and test loop that repeats of sensing chamber's internal modulation acquisition.When on-the-spot GIS office puts the UHF on-line monitoring two or more sensor is arranged, can realize the simulation to on-the-spot UHF installation of sensors mode and position by GIS fault simulation platform frock in sensing chamber, modulate the repeated nanosecond pulse source for scene UHF pick up calibration of the same type.
Native system is by the difference of discharging model, apply voltage and produce shelf depreciation, measure the UHF spectrogram of different electric discharge types, set up experts database after pattern recognition, for follow-up GIS partial discharges fault type diagnosis provides identification comparison source, for identifying the different insulative defect type.
The GIS shelf depreciation is ultrasonic, the corresponding detection check method of UHF sensor localization system detection check system comprises: select the reference coordinate initial point before test, measure and record the coordinate of point of discharge; In the reality of the electric discharge of simulation single-point, multiple spot electric discharge, the discharge scenario of GIS, select the different GIS shelf depreciation model of developing; Measured by GIS type local-discharge ultrasonic to be measured, UHF positioning system, the point of discharge coordinate of positioning result and record is compared, done the error comparative analysis.
In reality, the shelf depreciation of GIS point is arbitrarily, and when the product that different vendor produces positions, positioning error is difficult for relatively, thus the superiority-inferiority of each manufacturer's properties of product relatively.GIS shelf depreciation localization by ultrasonic Check and Inspection system, the actual office of Simulated GlS is condition to one's heart's content, but the position of point of discharge is known, therefore the platform of a performance test can be provided for the product that different vendor produces.
Finally should be noted that: above embodiment is only for technical scheme that the application is described but not to the restriction of its protection domain; although with reference to above-described embodiment, the application is had been described in detail; those of ordinary skill in the field are to be understood that: those skilled in the art still can carry out all changes, revise or be equal to replacement to the embodiment of application after reading the application; but these changes, revise or be equal to replacement, within the claim protection domain all awaited the reply in application.
Claims (6)
1. the detection system of a local discharge of gas-insulator switchgear detecting sensor, described system comprises the GIS tank body of horizontal positioned, it is characterized in that: bushing and lower end vertical with described GIS tank body is communicated with, and described bushing upper end is provided with grading ring; Described GIS tank surface is provided with tensimeter and charges and discharge valve, the built-in coupling condenser of described GIS tank body, and described coupling condenser is connected with the binding post that the GIS tank surface is installed;
Described GIS tank body external vertical connects two pairs of symmetrical GIS shelf depreciation models of placing, and described GIS shelf depreciation model top is provided with the infrared high-definition camera of observing GIS tank interior situation;
The GIS tank surface of the first side of described shooting is provided with standard UHF gauge hole and UHF gauge hole to be measured, described standard UHF gauge hole and UHF gauge hole to be measured are on same axis, and described GIS tank body one end is provided with ultrasonic signal inlet and UHF signal injection mouth.
2. the detection system of a kind of local discharge of gas-insulator switchgear detecting sensor as claimed in claim 1 is characterized in that: described binding post is put pick-up unit with office and is connected.
3. the detection system of a kind of local discharge of gas-insulator switchgear detecting sensor as claimed in claim 1, it is characterized in that: described GIS shelf depreciation model is push-down GIS shelf depreciation model, when changing model, the push rod of corresponding model is operated and described operation does not change the impermeability of GIS tank body.
4. the detection system of a kind of local discharge of gas-insulator switchgear detecting sensor as claimed in claim 1, it is characterized in that: sonac is affixed on described GIS tank surface.
5. the detection system of a kind of local discharge of gas-insulator switchgear detecting sensor as claimed in claim 4, it is characterized in that: the ultrasound partial discharge positioning system connects described sonac; UHF partial discharge location system connects described UHF sensor to be measured, described standard UHF sensor and described UHF signal injection mouth.
6. the detection system of a kind of local discharge of gas-insulator switchgear detecting sensor as claimed in claim 1, it is characterized in that: the measurement terminal of described sensor is connected with oscillograph.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510780A (en) * | 2015-11-27 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Insulation testing system and method for insulating pull rod of SF6 high-voltage electric appliance |
| CN108181597A (en) * | 2017-12-28 | 2018-06-19 | 国网辽宁省电力有限公司电力科学研究院 | A kind of GIS ultrahigh frequency local discharge sensor field test method |
| CN109257757A (en) * | 2018-08-23 | 2019-01-22 | 全球能源互联网研究院有限公司 | A kind of interference analysis system towards electric power wireless private network |
| CN110308344A (en) * | 2019-06-19 | 2019-10-08 | 深圳供电局有限公司 | Detect robot |
| CN114624641A (en) * | 2022-03-25 | 2022-06-14 | 广东电网有限责任公司广州供电局 | Online verification system and method based on ultrahigh frequency partial discharge sensor of intelligent power distribution room |
| CN117538712A (en) * | 2024-01-09 | 2024-02-09 | 保定天威新域科技发展有限公司 | Discharge type and position switching device and discharge model |
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2013
- 2013-07-17 CN CN 201320426221 patent/CN203350430U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510780A (en) * | 2015-11-27 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Insulation testing system and method for insulating pull rod of SF6 high-voltage electric appliance |
| CN105510780B (en) * | 2015-11-27 | 2018-11-16 | 云南电网有限责任公司电力科学研究院 | SF6 High-Voltage Electrical Appliances insulated pull rod Insulation Test system and method |
| CN108181597A (en) * | 2017-12-28 | 2018-06-19 | 国网辽宁省电力有限公司电力科学研究院 | A kind of GIS ultrahigh frequency local discharge sensor field test method |
| CN109257757A (en) * | 2018-08-23 | 2019-01-22 | 全球能源互联网研究院有限公司 | A kind of interference analysis system towards electric power wireless private network |
| CN109257757B (en) * | 2018-08-23 | 2021-11-09 | 全球能源互联网研究院有限公司 | Interference analysis system for electric power wireless private network |
| CN110308344A (en) * | 2019-06-19 | 2019-10-08 | 深圳供电局有限公司 | Detect robot |
| CN114624641A (en) * | 2022-03-25 | 2022-06-14 | 广东电网有限责任公司广州供电局 | Online verification system and method based on ultrahigh frequency partial discharge sensor of intelligent power distribution room |
| CN117538712A (en) * | 2024-01-09 | 2024-02-09 | 保定天威新域科技发展有限公司 | Discharge type and position switching device and discharge model |
| CN117538712B (en) * | 2024-01-09 | 2024-03-29 | 保定天威新域科技发展有限公司 | Discharge type and position switching device and discharge model |
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