CN101819227A - 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope - Google Patents
800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope Download PDFInfo
- Publication number
- CN101819227A CN101819227A CN201010120617A CN201010120617A CN101819227A CN 101819227 A CN101819227 A CN 101819227A CN 201010120617 A CN201010120617 A CN 201010120617A CN 201010120617 A CN201010120617 A CN 201010120617A CN 101819227 A CN101819227 A CN 101819227A
- Authority
- CN
- China
- Prior art keywords
- module
- electroscope
- signal
- extra
- high voltage
- 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
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope comprising a signal amplification module, a signal processing module, an alarming module, an analog-to-digital conversion and data processing module and an LCD (liquid crystal display) display module, wherein the signal processing module comprises a rectification module, a filtering module, a signal acquisition module, a comparing control module and a distance measurement module, and the signal acquisition module comprises a stator and a rotor. The electricity testing value of the electroscope is the electric field value of the on-site working position, which effectively broadens the use range of the electroscope and improves the accuracy of the electroscope. The electroscope tests electricity by taking a distance value of a working position and a lead to be detected and a field intensity value correspondingly obtained according to the field intensity curve and the variation trend of a space electric field as alarming threshold values, and whether the lead to be detected is charged or not is reflected according to acoustic and light signals of alarming, thereby effectively eliminating the interference of adjacent charged equipment and solving the problems that the repeatability of an electricity testing result is poor and the accuracy is low because of the interference of the charged body of adjacent equipment to be detected on the space field intensity.
Description
Technical field
The invention belongs to extra-high voltage direct-current stream power transmission and transforming equipment managing security tools and instruments, be specifically related to a kind of 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope.
Background technology
Operating maintenance work is the important means of grasping grid equipment ruuning situation, discovery in time and treatment facility defective." State Grid Corporation of China's electric power safety working regulation (power circuit part) " clearly stipulated: on the electrical equipment that part has a power failure, work or dead line job site attaching ground wire before, first electrical verification, the true no-voltage of identification equipment or circuit.Electroscope promptly is to be used for detecting whether have one of common tool of voltage on the power equipment, clearly verify by no-voltage whether really on the maintenance equipment by electroscope, carry out other operations again, in case charged attaching ground wire (splice grafting ground disconnecting link) appears, mistake is bumped the generation of serious accidents such as electric equipment.
In the Chinese patent 200910060796.9 " 1000kv extra-high voltage AC non-contact type electricity checking method and electroscope thereof ", the electrical verification reference value is obtained by the electric field intensity that data processing module carries out this working position of data acquisition with certain frequency, alarm threshold value is by site test repeatedly, rationally choose according to the variation tendency of electric field and to obtain, because the charging equipment in transformer station and the current conversion station is many, interference between the charging equipment is bigger, cause charging equipment formate field intensity on every side complicated and changeable, may disturb during electrical verification, so obtaining of reference value and alarm threshold value is subjected to external interference easily in this patent, accuracy is not high.
Summary of the invention
The purpose of this invention is to provide a kind of 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope; adopt the signal value of horizontal channel and the collection of vertical channel binary channels to obtain the electrical verification reference value; adopt the mode of range finding to obtain alarm threshold value; be used for 1000kV ultra-high voltage AC input transformation line project; whether have electricity, play the safeguard protection effect if measuring power transmission and transformation line.
In order to achieve the above object, technical scheme of the present invention is: the 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope, comprise the signal amplification module, signal processing module, alarm module, analog to digital conversion and data processing module and LCD display module, signal processing module comprises rectification module and filtration module, it is characterized in that: also comprise signal acquisition module, compare control module and range finder module, signal acquisition module is made of stator and rotor, position relation between each module is: signal acquisition module, the signal method module, rectification module, filtration module, analog to digital conversion and data processing module connect successively, range finder module is connected relatively control module with analog to digital conversion and data processing module, relatively control module connects alarm module and LCD display module, the function of each module is: signal acquisition module is used to gather the voltage signal of extra-high voltage, be used to amplify the signal that collects through the signal amplification module, signal processing module is handled the signal after amplifying; Range finder module surveying work position and power transmission and transformation line distance draw the alarm threshold value of corresponding field intensity value as electrical verification according to the field intensity curve and the variation tendency of space electric field, carry out electrical verification by the signal value that binary channels collects as reference value then; After the signal that analog to digital conversion and data processing module transmit signal processing module carried out data processing, interlink warning module, LCD display module were made corresponding sound, light is reported to the police and demonstration in real time.
Aforesaid 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope is characterized in that: analog to digital conversion and data processing mould are made of single-chip microcomputer and modulus conversion chip, and single-chip microcomputer adopts AT89S51, and modulus conversion chip adopts ADC0804.
Principle of work of the present invention is: the standard field intensity of measurement point when determining the transmission line of electricity operate as normal according to the distance of measurement point and transmission line of electricity, it is alarm threshold value, adopt the vertical and horizontal binary channels that on-site signal is gathered, to collect to such an extent that signal and alarm threshold value are made comparisons, if be greater than or equal to alarm threshold value, electroscope is made sound and light alarm, and on LCD, show the electrical verification result, can judge whether charged transmission line of electricity is rapidly, and can accurately locate live wire rapidly, effectively raise galvanoscopic electrical verification and positional accuracy.
The invention has the beneficial effects as follows: because the alerting signal that the present invention is the multi channel signals that relatively collects to draw with distance value according to working position and testee, thereby judge whether power transmission and transformation line is charged, got rid of the interference of contiguous charging equipment effectively, the electrified body that has solved contiguous equipment under test causes the electrical verification difficult problem that repeatability is bad as a result, accuracy is not high to the interference of space field intensity.
China's extra high voltage direct current transmission line engineer operation security protection requirement is satisfied in this invention, has filled up the blank of China on extra-high voltage electric transmission and transformation device security Work tool, is applicable to the extra-high voltage electric transmission and transformation line data-logging.
Description of drawings
Fig. 1 is an embodiment of the invention hardware system block scheme.
Fig. 2 is the signal acquisition module schematic diagram among Fig. 1.
Fig. 3 is the signal amplification module schematic diagram among Fig. 1.
Fig. 4 is a rectification circuit schematic diagram in the signal processing module among Fig. 1.
Fig. 5 is analog to digital conversion and the data processing module peripheral circuit diagram among Fig. 1.
Fig. 6 is a invention process software programming process flow diagram.
Embodiment
Example is described further extra-high voltage direct-current non-contact multichannel distance measurement type electroscope of the present invention during below in conjunction with accompanying drawing and enforcement:
Description of symbols among Fig. 1: 1,6-signal acquisition module, 2,7-signal amplification module, 3, the 8-rectification module, 4,9-filtration module, 5,10-analog to digital conversion and data processing module, the 11-range finder module, 12-is control module relatively, 13-alarm module, 14-LCD display module.
Description of symbols among Fig. 2: 28-rotor, 29-stator, 30-ground brush, 31-synchronous generator, 32-motor, 33-prime amplifier, 34-circuit for controlling motor.
Mark among Fig. 3: 15-differential input stage, 16-voltage amplifier stage, 17-output stage, 18-biasing circuit.
Description of symbols among Fig. 6: whether the 19-self check is passed through, 20-range finding, 21-detects, 22-relatively, whether 23-sound and light alarm, 24-has electricity, 25-does not have electricity, the 26-cycle detection, 27-stops electrical verification work.
Fig. 1 is an embodiment of the invention hardware system block scheme, extra-high voltage direct-current non-contact multichannel distance measurement type electroscope provided by the invention, range finder module 11 is measured the distance of measurement point apart from power transmission and transformation line, field intensity curve and variation tendency according to distance of measuring and space electric field obtain standard field intensity value, level is gathered signal simultaneously with vertical two passages during the electroscope operate as normal, the signal that collects shows on LCD, and make comparisons with standard field intensity value, position whether charged transmission line of electricity is accurately, interlink warning module 13 is made mutually at the sound then, visual alarm and LCD display module 14 show.
As shown in Figure 2, signal acquisition module 1,6 adopts alternation inductive method principle of induction to come acquired signal, the alternation inductive method is mainly used in the measurement of dc fields, it is made of stator 29 (sensing chip) and rotor 28 (shield blade), and when rotor rotated, stator periodically was exposed among the external electrical field E, or the conductively-closed sheet blocks, make E=0, go round and begin again like this, just produce the alternation output signal.
As shown in Figure 3, signal amplification module 2 has adopted the operational amplification circuit that differential signal is amplified to suppress common mode interference signal; The differential type amplifying circuit that input stage generally is made up of BJT, JFET or MOSFET among Fig. 3 utilizes its symmetry characteristic can improve the common-mode rejection ratio of entire circuit, and its two input ends constitute the inverting input and the in-phase input end of entire circuit.The main effect of voltage amplifier stage 16 is to improve voltage gain, and it can be made up of one or more levels amplifying circuit.Output stage 17 generally is made up of voltage follower or complementary voltage follower, to reduce output resistance, improves carrying load ability.Biasing circuit 18 is to provide suitable working current at different levels.Also have some auxiliary links in addition, as level shift circuit, overload protecting circuit and high-frequency compensation link etc.
Signal processing module is to convert AC signal to direct current signal, and whole module is made of prime second order filter, rectification circuit and back level second order filter, and the prime wave filter is used to cut down high-frequency interferencing signal, and back level wave filter is used for the filtration of ripple; As shown in Figure 4, rectification circuit is made up of two operational amplifiers and peripheral resistance, diode: previous operational amplifier and corresponding resistor, diode constitute an equal proportion amplifying circuit; Second operational amplifier and advance signal are formed an adding circuit, can change the enlargement factor of rectification circuit by the value that changes R14.The resistance value of R8, R9, R10, R11, R12, R13, R14 is respectively: 10K, 10K, 10K, 20K, 10K, 10K, 20K.
As shown in Figure 5, analog to digital conversion and data processing module are made of single-chip microcomputer and modulus conversion chip, effect is that the DC simulation conversion of signals is become digital signal, after digital filtering and data computation Intelligent treatment, judge whether that according to the data that obtain out-of-limit back sends action command to alarm module and LCD display module; Alarm module comprises hummer sounding alarm and pilot lamp warning, and the LCD display module can show the distance value of detected binary channels data and stadimeter, carries out relevant action according to the instruction that receives.Single chip computer AT 89S51 mainly realizes following function:
(a) control receives the data of laser range finder;
(b) control ADC0804 finishes analog to digital conversion;
(c) carry out data processing;
(d) control hummer and alarm lamp;
(e) control LCD display;
Therefore, the peripheral interface design of the AT89S51 that relates to is as follows:
(a) the P0 mouth as with the FPDP of LCD;
(b) P1.0, P1.1 and P1.2 are used to control the LCD display module;
(c) the P2 mouth as with the FPDP of ADC0804;
(d) P1.3, P1.4, P3.6 and P3.7 mouth as with the control port of ADC0804;
(e) P1.5 and P1.6 are respectively applied for the switching of control Auto-Sensing Mode and mode of operation;
(f) P1.7 control hummer and light emitting diode.
In case electroscope booting wait button is pressed and is entered the self check link, if self-test switch is not pressed, then do not carry out following procedure, after pressing, button promptly power unit is carried out self check, and adopt LCD to show whether abundance realizes electric weight.Can't operate as normal when power unit, then show the electric weight deficiency; If working properly at power unit, then enter the self check link, above-mentioned self check process relates to whole galvanoscopic each functional module, and whether the size by measuring the self check output signal is can decision circuitry working properly; Wait for the laser range finder range finding after the self check, when laser range finder was sent into data, single-chip microcomputer can produce interruption, with data storage and the demonstration of sending here; Enter mode of operation afterwards, signal behind signal amplification module, the signal processing module, among the input ADC0804, changes into digital signal by ADC0804 with simulating signal through signal acquisition module, sends into single-chip microcomputer.Single-chip microcomputer is received data and is stored designating unit into; Carry out data processing subsequently, to changing corresponding standard field intensity value into as alarm threshold value, the data-switching that ADC0804 is sent here becomes corresponding field intensity value to show that as reference value and on LCD its value is big or small with the distance value of storage; Then two values are compared,, carry out sound and light alarm and on LCD, show chargedly, otherwise will proceed to detect if reference value, illustrates then that testee is charged more than or equal to alarm threshold value.
Fig. 6 is an embodiment of the invention software programming process flow diagram, it is characterized in that: the extra-high voltage direct-current non-contact multichannel distance measurement type electroscope electricity-testing method mainly is divided into self check 19, range finding 20, detect 21, relatively 22,23 5 stages of sound and light alarm, and program mainly considers to coordinate the compatible and reasonably resources allocation of each module; Then the control of various piece is wanted rationally to coordinate; Consider data processing module again, make it have general data processing function.
The reference value of the invention process electrical verification is variable, enter the working position, press reset key, after self check is passed through, promptly carry out electric field measurement work, (10KHz) carries out the data acquisition of horizontal channel and vertical channel with certain frequency, writes down the electric field intensity of this working position, as the reference value of electrical verification and show on LCD.According to judging with the corresponding alarm threshold value of distance value of range finding whether equipment under test is charged.
The working specification of the embodiment of the invention:
(1) before using extra-high voltage direct-current non-contact multichannel distance measurement type electroscope, must check electroscope.If find electroscope exist crackle, each parts install not fastening, etc. phenomenon must not use.
(2) have only the electroscope that has passed through self check just can be used for the electrical verification operation.Whether the electroscope self check is by judging according to following phenomenon:
(a) turn on the power switch, power light (green light) is bright.If do not work, illustrate that then electroscope is out of order, should stop electrical verification work.
(b) press the power self test button, and then press the self check button and carry out self check, if normal, the reference value of LCD last meeting reveal competence passage and vertical channel if do not show or LCD demonstration mess code, illustrates that electroscope has fault, should stop using; Whether the abundance of battery electric quantity also shown by LCD, if the electric weight abundance then shows self-check pass, if the battery electric quantity deficiency shows that then self check do not pass through, should stop using.
(3) extra high voltage direct current transmission line is carried out electrical verification, operation steps is:
(a) operating personnel be positioned at tested phase conductor under, open the electroscope power switch.
(b) treat electroscope by the self check stage enter wait for the laser ranging duty after, laser range finder is fixed with tripod, aim at tested lead by the range finding key, unclamp in back 1 second, on LCD, can show the distance of lead and working position.
(c) press job key then and enter duty, the detected value of galvanoscopic horizontal channel and vertical channel can show on LCD.
(d) wait for that then single-chip microcomputer handles data automatically, relatively.Whole process was finished in 1 second greatly.
(e) if reference value more than or equal to alarm threshold value, then single-chip microcomputer is reported to the police, and illustrates that tested lead is charged; Otherwise illustrate that tested lead is not charged, can detect next lead.
Claims (2)
1.800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope, comprise the signal amplification module, signal processing module, alarm module, analog to digital conversion and data processing module and LCD display module, signal processing module comprises rectification module and filtration module, it is characterized in that: also comprise signal acquisition module, compare control module and range finder module, signal acquisition module is made of stator and rotor, position relation between each module is: signal acquisition module, the signal method module, rectification module, filtration module, analog to digital conversion and data processing module connect successively, range finder module is connected relatively control module with analog to digital conversion and data processing module, relatively control module connects alarm module and LCD display module.
2. 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope as claimed in claim 1, it is characterized in that: analog to digital conversion and data processing mould are made of single-chip microcomputer and modulus conversion chip, single-chip microcomputer adopts AT89S51, and modulus conversion chip adopts ADC0804.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010120617A CN101819227A (en) | 2010-03-10 | 2010-03-10 | 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010120617A CN101819227A (en) | 2010-03-10 | 2010-03-10 | 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101819227A true CN101819227A (en) | 2010-09-01 |
Family
ID=42654397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010120617A Pending CN101819227A (en) | 2010-03-10 | 2010-03-10 | 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101819227A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091547A (en) * | 2013-02-04 | 2013-05-08 | 杭州双东电力科技有限公司 | Full voltage class wireless electroscope |
| CN103698591A (en) * | 2013-12-06 | 2014-04-02 | 国家电网公司 | Electroscopic device and electroscopic method of near field region of supervoltage or ultra-high voltage transmission line |
| CN104076195A (en) * | 2014-06-06 | 2014-10-01 | 西安光远电气有限责任公司 | Non-contact electricity verification device based on vertical field intensity difference distribution curve matching |
| CN105190332A (en) * | 2013-02-08 | 2015-12-23 | B2电子有限公司 | Mobile high-voltage tester |
| CN105606878A (en) * | 2015-11-05 | 2016-05-25 | 浙江安侣智能科技有限公司 | Electroscope and electroscopic method |
| CN106291081A (en) * | 2016-08-17 | 2017-01-04 | 众芯汉创（北京）科技有限公司 | Far-field region electrical verification system and method |
| CN106353581A (en) * | 2016-09-27 | 2017-01-25 | 重庆理工大学 | High voltage electroscope based on electro-optic effect |
| CN108535536A (en) * | 2018-05-02 | 2018-09-14 | 湖南中车时代通信信号有限公司 | A kind of the train operating mode voltage collection circuit and method of full-time self-test |
| CN109521266A (en) * | 2019-01-25 | 2019-03-26 | 南京文道自动化系统有限公司 | ± 800KV extra-high voltage direct-current non-contact intelligent electroscope |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0134943A1 (en) * | 1983-07-25 | 1985-03-27 | Hydro-Quebec | System and method for detecting proximity to electrical power lines |
| CN101419257A (en) * | 2008-10-10 | 2009-04-29 | 清华大学 | Ground electric field measurement system for AC/DC parallel powerline and measurement method thereof |
| CN101487858A (en) * | 2009-02-20 | 2009-07-22 | 国网电力科学研究院 | 1000kV extra-high voltage AC non-contact type electricity checking method and apparatus |
| CN201607477U (en) * | 2010-03-10 | 2010-10-13 | 国网电力科学研究院 | 800kV ultra-high voltage direct-current non-contact multichannel range-finding type electroscope |
-
2010
- 2010-03-10 CN CN201010120617A patent/CN101819227A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0134943A1 (en) * | 1983-07-25 | 1985-03-27 | Hydro-Quebec | System and method for detecting proximity to electrical power lines |
| CN101419257A (en) * | 2008-10-10 | 2009-04-29 | 清华大学 | Ground electric field measurement system for AC/DC parallel powerline and measurement method thereof |
| CN101487858A (en) * | 2009-02-20 | 2009-07-22 | 国网电力科学研究院 | 1000kV extra-high voltage AC non-contact type electricity checking method and apparatus |
| CN201607477U (en) * | 2010-03-10 | 2010-10-13 | 国网电力科学研究院 | 800kV ultra-high voltage direct-current non-contact multichannel range-finding type electroscope |
Non-Patent Citations (1)
| Title |
|---|
| 《中国博士学位论文全文数据库工程科技Ⅱ辑》 20090615 汪金刚 高压设备放电紫外检测技术及其应用研究 97-98 1-2 , 2 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091547A (en) * | 2013-02-04 | 2013-05-08 | 杭州双东电力科技有限公司 | Full voltage class wireless electroscope |
| CN105190332A (en) * | 2013-02-08 | 2015-12-23 | B2电子有限公司 | Mobile high-voltage tester |
| CN105190332B (en) * | 2013-02-08 | 2019-01-22 | B2电子有限公司 | Moveable high-pressure test equipment |
| CN103698591A (en) * | 2013-12-06 | 2014-04-02 | 国家电网公司 | Electroscopic device and electroscopic method of near field region of supervoltage or ultra-high voltage transmission line |
| CN104076195B (en) * | 2014-06-06 | 2015-05-13 | 西安光远电气有限责任公司 | Non-contact electricity verification device based on vertical field intensity difference distribution curve matching |
| CN104076195A (en) * | 2014-06-06 | 2014-10-01 | 西安光远电气有限责任公司 | Non-contact electricity verification device based on vertical field intensity difference distribution curve matching |
| CN105606878A (en) * | 2015-11-05 | 2016-05-25 | 浙江安侣智能科技有限公司 | Electroscope and electroscopic method |
| CN106291081A (en) * | 2016-08-17 | 2017-01-04 | 众芯汉创（北京）科技有限公司 | Far-field region electrical verification system and method |
| CN106291081B (en) * | 2016-08-17 | 2023-11-21 | 众芯汉创（北京）科技有限公司 | Far field electric testing system and method |
| CN106353581A (en) * | 2016-09-27 | 2017-01-25 | 重庆理工大学 | High voltage electroscope based on electro-optic effect |
| CN106353581B (en) * | 2016-09-27 | 2021-03-12 | 重庆理工大学 | High-voltage electroscope based on electro-optic effect |
| CN108535536A (en) * | 2018-05-02 | 2018-09-14 | 湖南中车时代通信信号有限公司 | A kind of the train operating mode voltage collection circuit and method of full-time self-test |
| CN108535536B (en) * | 2018-05-02 | 2023-08-25 | 湖南中车时代通信信号有限公司 | Train working condition voltage acquisition circuit and method for full-time self-detection |
| CN109521266A (en) * | 2019-01-25 | 2019-03-26 | 南京文道自动化系统有限公司 | ± 800KV extra-high voltage direct-current non-contact intelligent electroscope |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101819226B (en) | 1000kV extra-high voltage alternating-current non-contact multichannel distance measurement type electroscope | |
| CN201607477U (en) | 800kV ultra-high voltage direct-current non-contact multichannel range-finding type electroscope | |
| CN101819227A (en) | 800kV extra-high voltage direct-current non-contact multichannel distance measurement type electroscope | |
| CN201611364U (en) | 1000kV extra-high voltage alternating-current non-contact multichannel range-measuring type electroscope | |
| CN101487858B (en) | 1000kV extra-high voltage AC non-contact type electricity checking method and apparatus | |
| CN101482602A (en) | Detection analysis system of relay-protection tester | |
| CN101833051A (en) | Electrified tester for zinc oxide arrester | |
| CN101876673A (en) | Extreme high voltage direct-current non-contact distance-measurement electricity-testing method | |
| CN108594041B (en) | Detection platform for non-invasive household power load monitoring device | |
| CN102200558A (en) | Starting-up/shutdown detection circuit | |
| CN104777388A (en) | Method for recognizing power supply branch circuit users through zero sequence current sampling method | |
| CN201654153U (en) | Live tester of zinc oxide arrester | |
| CN101968524A (en) | Division test method and tester for multi-point grounding of common loop | |
| CN110794357A (en) | All-round safety protection's 10kV power transformer full capability test system | |
| CN103076560B (en) | Electrical test equipment non-contact measurement combination unit and application thereof | |
| CN110165674B (en) | Active filter safety management system | |
| CN105548846A (en) | Signal frequency conversion preposition module of portable intelligent four-channel partial discharge detector | |
| CN201628742U (en) | 1000-kilovalt ultra-high voltage alternating-current non-contact electroscope | |
| CN203299284U (en) | Phase detecting device for 10kv switch cabinet | |
| CN110596447A (en) | Electric field measurement-based charged equipment surrounding safety detection device and detection method thereof | |
| CN104049219A (en) | Automatic test instrument for power source test | |
| CN205404719U (en) | Mutual -inductor common return multipoint earthing detector | |
| CN101710151A (en) | Extra-high voltage direct current non-contact multi-channel electricity checking method | |
| CN205581212U (en) | Power battery internal resistance on -line monitoring system | |
| CN201319063Y (en) | Detecting and analyzing device of relay protection testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100901 |