CN201438201U - Secondary loop circuit voltage drop synchronous detection device for voltage mutual inductor - Google Patents
Secondary loop circuit voltage drop synchronous detection device for voltage mutual inductor Download PDFInfo
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- CN201438201U CN201438201U CN 200920142350 CN200920142350U CN201438201U CN 201438201 U CN201438201 U CN 201438201U CN 200920142350 CN200920142350 CN 200920142350 CN 200920142350 U CN200920142350 U CN 200920142350U CN 201438201 U CN201438201 U CN 201438201U
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Abstract
The utility model relates to a secondary loop circuit voltage drop synchronous detection device for a voltage mutual inductor, which comprises a host at the energy meter end, an auxiliary computer at the voltage mutual inductor end, the host and the auxiliary computer respectively comprises a control module, a measurement module, a man-machine interface module, a wireless communication module electrically connected with the control module for establishing the communication channel between the host and the auxiliary computer, and a GPS synchronous module controlled by the control module for outputting synchronous sampling frequency to the measurement module, during site operation, firstly, the communication channel is established between the host and the auxiliary computer, the host sends convention time information to the auxiliary computer, when the convention time information is up, the GPS synchronous module starts and guarantees the sampling synchronization of the host and the measurement module of the auxiliary computer and avoids the trouble of wiring temporal cable between the energy meter side and the PT end; the synchronous sampling of the host on the energy meter auxiliary unit and the voltage mutual inductor so that the accuracy of electric energy measurement is guaranteed.
Description
Technical field
The utility model relates to a kind of electric energy metrical detecting instrument, relates in particular to a kind of device that is used to detect the voltage transformer secondary loop pressure drop.
Background technology
The accuracy of electric energy metrical is the important indicator that is related to power supply and electricity consumption sectional interests, reduces electric energy metering error, and the accuracy that improves metering is the common requirement of each side.Electric energy metrical generally has measurement on the spot and strange land to measure two kinds, and for the mode of measuring on the spot, the distance of electric energy meter and mutual inductor is very near, and intermediate link is few, so there is not the problem of voltage transformer secondary loop pressure drop in this metering system.And for the strange land metering system, this metering system is especially general in China, generally is mutual inductor at outdoor, electric energy meter in the pulpit, connects by tens meters leads to hundreds of rice therebetween, and also have fuse, switch and connection terminal etc. in lead.Fig. 1 has provided the wiring schematic diagram of voltage transformer (VT) and current transformer, among the figure, PT is a voltage transformer (VT), the secondary endpiece is received on the potential winding of electric energy meter by high-speed switch K, fuse S, CT is a current transformer, its secondary endpiece is received on the current coil of electric energy meter, and the electric weight of electric energy meter indication be multiply by the no-load voltage ratio coefficient of PT and CT, is user's actual electric weight.Therefore, as seen from Figure 1, electric energy metering error is made up of the resultant error of mutual inductor, the error of electric energy meter and the error that the voltage transformer pt secondary voltage drop causes.In these factors, the influence of PT secondary voltage drop is often comparatively serious.
Voltage transformer (VT) in electric power meter distance common and electric energy meter is far away, and bigger secondary load electric current and secondary circuit impedance cause the amplitude and the phase place of PT secondary terminals voltage and electric power meter end voltage inconsistent, influence the accurate, just of electric energy metrical.The PT secondary voltage drop is subjected to extensive concern as a part that constitutes error in dipping, and strict monitoring, control criterion are all arranged both at home and abroad.Regulation among the industry standard of China---the DL/T448-2000 " electric power meter technical management rules ": the voltage transformer secondary loop voltage that I, II class are used for the electric power meter of trade settlement is fallen and should be not more than 0.2% of its rated secondary voltage, and voltage transformer secondary electricity loop pressure drop should be not more than 0.5% of its rated secondary voltage in other electric power meters; Reply voltage transformer secondary loop pressure drop in service regularly detects, and the general provision sense cycle is 2 years.Therefore, need a kind of pick-up unit that can be used to detect the PT secondary circuit voltage drop accurately, safely, efficiently.
Existing P T secondary circuit voltage drop pick-up unit generally includes main and auxiliaries, main frame is positioned at electric power meter end, subsidiary engine is positioned at the voltage transformer (VT) end, main and auxiliaries comprises control module respectively, measurement module and human-machine interface module, control module is mainly controller, as CPU or MCU etc., measurement module is mainly by filtering circuit, shaping circuit, compositions such as A/D converter, human-machine interface module is connected with the control module output terminal, be used for showing measurement result of calculation, ratio as secondary circuit, angular difference and voltage drop value etc., when carrying out in-site measurement, need lay tens meters cables from voltage transformer (VT) and electric energy meter to hundreds of rice, the detection that is this secondary circuit voltage drop is undertaken by wired mode, because cable need be walked around various obstacles when laying, and time-consuming effort again, and the power grid accident that might cause, influence the safe and stable operation of electrical network.
In order to overcome the problems referred to above, also have wireless detection device in the prior art, this wireless detection device be main and auxiliaries respectively many wireless communication module that can mutual communication, wireless communication module is made up of signal generating circuit, carrier current channel, emission/receiving circuit and antenna usually, this wireless detection device has been avoided the problem of cable laying between electric energy meter and voltage transformer (VT), but, this kind metering system still can not guarantee the synchronism measured, therefore also just can not guarantee the accuracy of measuring.
The utility model content
The utility model purpose be exactly provide in order to overcome the deficiencies in the prior art a kind of can more accurate measurement electric energy meter and voltage transformer (VT) between the pick-up unit of secondary circuit voltage drop.
In order to reach the foregoing invention purpose, the technical solution of the utility model is: a kind of voltage transformer secondary loop pressure drop sync detection device, it is used to measure the secondary circuit voltage drop between electric energy meter and the voltage transformer (VT), comprise the main frame that is positioned at electric power meter end, be positioned at the subsidiary engine of voltage transformer (VT) end, described main and auxiliaries comprises control module respectively, gather the measurement module of the voltage signal of electric energy meter and voltage transformer (VT) with described control module being used to of being electrically connected, be electrically connected with control module one output terminal and be used for the human-machine interface module that information shows, and control module is electrically connected and is used to set up the wireless communication module of communication channel between the main and auxiliaries and is controlled by the GPS synchronization module that described control module is used for exporting to described measurement module the synchronized sampling frequency, described each measurement module has the voltage input end mouth that is connected with voltage transformer (VT) with corresponding electric energy meter, in working order, the control module of main frame sends measuring command by its wireless communication module to subsidiary engine, the wireless communication module of subsidiary engine receives the measuring command of main frame and transfers to the subsidiary engine control module, the control module of main and auxiliaries starts corresponding GPS synchronization module according to measuring command, described GPS synchronization module output clock sync signal makes measurement module carry out synchronized sampling to the voltage of electric energy meter and voltage transformer (VT), the result that the control module of subsidiary engine will be sampled again sends to main frame by its wireless communication module, the control module of main frame is calculated the ratio of secondary circuit, angular difference and voltage drop value, and show by human-machine interface module.
Further, the sampling pulse generator that described GPS synchronization module comprises gps receiver, is electrically connected with the output terminal of described gps receiver, described gps receiver is used to export synchronous low frequency pulse signal, described sampling pulse generator is used to produce the required high frequency sampling pulse of described measurement module, and described high frequency sampling pulse in per second, be forced to the low frequency pulse signal of gps receiver output synchronously at least once.
Described GPS synchronization module also comprises pulse per second (PPS) detecting device, crystal oscillating circuit, described pulse per second (PPS) detecting device is connected electrically between described gps receiver output terminal and the crystal oscillating circuit output terminal, and the output terminal of described pulse per second (PPS) detecting device and described sampling pulse generator input end are electrically connected.
The clocking error of described gps receiver is less than 200ns.
The voltage input end mouth of described measurement module comprises phase three-wire three and two kinds of modes of connection of three-phase and four-line.
Thereby also having to be used for being electrically connected with described voltage transformer (VT), the measurement module of described subsidiary engine measures the electric current access interface of loop load to gather current signal on the voltage transformer (VT).
Because the utilization of technique scheme, the utility model compared with prior art has following advantage: the utility model adopts the GPS synchronization module to guarantee the synchronism of sampling, when promptly operating at the scene, at first the wireless communication module of main and auxiliaries is set up communication port, main frame sends designated time information to subsidiary engine, after this designated time information arrives, thereby the GPS synchronization module starts the sample-synchronous of the measurement module that guarantees main and auxiliaries.Therefore, thereby the utility model has been avoided drawing between electric energy meter side and PT end and has been established temporary cable and stopped to establish the power grid accident while that cable may cause because of drawing, guaranteed main frame again to the synchronized sampling of electric energy meter subsidiary engine, thereby guaranteed the accuracy of electric energy metrical voltage transformer (VT).
Description of drawings
Accompanying drawing 2 is the utility model pick-up unit functional schematic block diagram;
Accompanying drawing 3 is the theory diagram that the utility model pick-up unit main frame is further realized;
Accompanying drawing 4 is the theory diagram that the utility model pick-up unit subsidiary engine is further realized;
Accompanying drawing 5 is the utility model pick-up unit Principle of Communication figure;
Wherein: 1, main frame; 11, control module; 12, measurement module; 13, human-machine interface module; 14, wireless communication module; 15, GPS synchronization module;
2, subsidiary engine; 21, control module; 22, measurement module; 23, human-machine interface module; 24, wireless communication module; 25, GPS synchronization module;
15, GPS synchronization module; 151, gps receiver; 152, sampling pulse generator; 153, pulse per second (PPS) detecting device; 154, crystal oscillating circuit;
25, GPS synchronization module; 251, gps receiver; 252, sampling pulse generator; 253, pulse per second (PPS) detecting device; 254, crystal oscillating circuit;
Embodiment
Below in conjunction with accompanying drawing the utility model preferred embodiment is elaborated:
Voltage transformer secondary loop pressure drop pick-up unit as shown in Figure 2, it comprises main frame 1 and 2 two independent parts of subsidiary engine, main frame 1 is positioned at electric power meter end (Wh end), and subsidiary engine 2 is positioned at the voltage transformer pt end, and existing function to main frame 1 and subsidiary engine 2 realizes and principle of work specifies as follows:
Described main frame 1 mainly is made up of control module 11, measurement module 12, human-machine interface module 13, wireless communication module 14 and GPS synchronization module 15, and as shown in Figure 3, control module 11 is a nucleus module, is mainly realized by a CPU; Measurement module 12 comprises filtering shaping circuit, sampling hold circuit S/H, the A/D converter composition that output terminal is electrically connected successively, the CPU input end of the output of A/D converter and control module 11 is electrically connected, measurement module 12 has the voltage input end mouth, this voltage input end mouth is used to connect the voltage terminal of electric power meter end, it has three-phase and four-line and two kinds of modes of connection of phase three-wire three, and the input signal cable of port should be corresponding one by one with the sign of terminal; The output terminal of human-machine interface module 13 input ends and control module 11 is electrically connected, it mainly is made of display circuit and display thereof, in the present embodiment, display can adopt LCDs, resolution is chosen in 640*480, it can show full menu in Chinese and operation indicating, and can show voltage and other measurement of correlation information that ratio, angular difference, pressure drop, resultant error, PT end and Wh hold by a screen; Wireless communication module 14 is mainly by signal generating circuit, carrier current channel, composition such as emission/receiving circuit and antenna, in the present embodiment, wireless communication module 14 adopts the integrated circuit block that is formed by foregoing circuit to constitute, it has universal serial bus, the GPS synchronization module 15 that is used for being connected with control module 11 also is an integrated circuit modules, it is mainly by gps receiver 151, crystal oscillating circuit 154, be connected electrically in the pulse per second (PPS) detecting device 153 between the output terminal of the output terminal of described gps receiver 151 and crystal oscillating circuit 154, form with the sampling pulse generator 152 that described pulse per second (PPS) detecting device 153 output terminals are electrically connected, gps receiver 151 outputs have two kinds of time signals usually: the one, and the pulse signal (1pps) of interval 1s; The 2nd, the universal time corresponding and the date code (year, month, day, hour, min, second) of serial ports output with pulse front edge.Multiple gps receiver is arranged on the existing market,, generally require the gps clock error, select the special-purpose GPS receiver module of producing by motorola inc in the present embodiment for use less than 200ns because the accuracy of PT secondary voltage drop measurement requirement is higher.Because the influence of bad or some interference of satellite-signal, the 1pps pulse may not meet the demands, and the reply pulse quality detects, and therefore, is provided with pulse per second (PPS) detecting device 153 in the present embodiment, detects and just exports to Synchronous Sampling Pulses Gremerator 152 after qualified.The 1pps pulse of gps receiver 151 being exported by the high-frequency impulse counting that adopts quartz crystal oscillator circuit 154 to produce detects, and this detection not only can detect pulse width, can also detect rising edge of a pulse, negative edge, high level, low level width.Because gps receiver 151 outputs is the low frequency pulse per second (PPS), can not be directly as the sampling control signal of the ADC of measurement module 12, therefore require to be provided with sampling pulse generator 152 and produce the higher sampling pulse of frequency, and make its per second be forced to the 1pps impulsive synchronization once, control ADC in per second, carry out uniformly-spaced, synchronized sampling.Synchronous Sampling Pulses Gremerator 152 can adopt the phase locking frequency multiplying circuit to realize.
Above-mentioned functional structure to main frame 1 is introduced, the functional structure of subsidiary engine 2 and main frame 1 are basic identical, it mainly comprises control module 21, measurement module 22, human-machine interface module 23, wireless communication module 24 and GPS synchronization module 25 are formed, above-mentioned control module 21, measurement module 22, wireless communication module 24, the hardware implementation mode of GPS synchronization module 25 and main frame 1 are basic identical, wherein, GPS synchronization module 25 also is an integrated circuit modules, it is mainly by gps receiver 251, crystal oscillating circuit 254, be connected electrically in the pulse per second (PPS) detecting device 253 between the output terminal of the output terminal of described gps receiver 251 and crystal oscillating circuit 254, form with the sampling pulse generator 252 that described pulse per second (PPS) detecting device 253 output terminals are electrically connected, as shown in Figure 4, do not repeat them here.Need to prove that the voltage input end mouth of measurement module 22 is used to connect the voltage terminal of voltage transformer (VT), it also has three-phase and four-line and two kinds of modes of connection of phase three-wire three, and the input signal cable of port should be corresponding one by one with the sign of terminal.Man-machine construction module 23 also adopts the mode of LCDs, and it is used for showing information such as GPS state, the mode of connection, metering system, battery information, time, voltage effective value, frequency when measuring.Simultaneously, thereby the measurement module 22 of subsidiary engine 2 also has and is used for the external impressed current mutual inductor to obtain the electric current input interface that the transformer secondary circuit electric current carries out the loop load measurement, and it also has three-phase and four-line and two kinds of modes of connection of phase three-wire three.
Above-mentioned structure to main frame 1 and subsidiary engine 2 has carried out dividing other explanation, now the two collaborative work principle is introduced: as shown in Figure 5, at first main frame 1 is connected with the voltage terminal of electric energy meter according to the concrete mode of connection, subsidiary engine 2 is electrically connected with the voltage terminal of voltage transformer (VT), the control module 11 of main control system 1, make and set up communication channel between the wireless communication module 24 of the wireless communication module 14 of main frame 1 and subsidiary engine 2, the control module 11 of main frame sends to subsidiary engine 2 with measuring command by its wireless communication module 14 then, the wireless communication module 24 of subsidiary engine 2 receives the control module 21 that information is sent to after this order subsidiary engine, after finishing mentioned order, the GPS synchronization module 15 of main frame 1 and the GPS synchronization module 25 of subsidiary engine 2 start synchronously, its output synchronizing pulse is to control each measurement module 12,22 sample frequency, thereby the sample-synchronous of assurance main frame 1 and subsidiary engine 2.Subsidiary engine 2 sends to main frame 1 with measurement data by its wireless communication module 24, the data that the control module 11 of main frame 1 records with himself after receiving the measurement data of subsidiary engine are calculated, thereby draw the information such as ratio, angular difference and pressure drop of PT secondary circuit, and The above results is shown, exports or preserves by its human-machine interface module 13.
When specifically measuring at the scene, the receiving antenna of the corresponding GPS synchronization module 15,25 of main frame 1 and subsidiary engine 2 need be placed on outdoor spacious place or window and can see a day vacancy (guaranteeing big as far as possible visual sky angle), and make it upwards terminal, to guarantee that gps antenna can receive four or above satellite-signal; Simultaneously, make the dual-mode antenna of each wireless communication module 14,24 can not lean on wall to place, apart from wall more than 0.5 meter.Available then multimeter is checked between each voltage input end of main frame and electric energy meter between each voltage input end of whether short circuit, subsidiary engine and voltage transformer (VT) whether short circuit, determines can measure according to the program of setting after the good above-mentioned information.
The utility model pick-up unit, it adopts GPS synchronization module and wireless communication module on main and auxiliaries, not only realized the wireless measurement of voltage transformer secondary loop pressure drop, and guaranteed the synchronism that main and auxiliaries is measured, therefore, use at the scene of this device, can not have influence on the safe and stable operation of electrical network, and guaranteed the accuracy of electric energy metrical, will bring bigger facility for electric energy metrical work.
Claims (6)
1. voltage transformer secondary loop pressure drop sync detection device, the secondary circuit voltage drop that it is used to measure between electric energy meter and the voltage transformer (VT) comprises the main frame (1) that is positioned at electric power meter end, the subsidiary engine (2) that is positioned at the voltage transformer (VT) end, it is characterized in that:
Described main frame (1) and subsidiary engine (2) comprise control module (11 respectively, 21), with described control module (11,21) being used to of being electrically connected gathered the measurement module (12 of the voltage signal of electric energy meter and voltage transformer (VT), 22), with control module (11,21) output terminal is electrically connected and is used for the human-machine interface module (13 that information shows, 23), with control module (11,21) be electrically connected and be used to set up the wireless communication module (14 of communication channel between main frame (1) and the subsidiary engine (2), 24) and be controlled by described control module (11,21) be used for to described measurement module (12,22) the GPS synchronization module (15 of output synchronized sampling frequency, 25), described each measurement module (12,22) has the voltage input end mouth that is connected with voltage transformer (VT) with corresponding electric energy meter, in working order, the control module (11) of main frame (1) sends measuring command by its wireless communication module (14) to subsidiary engine (2), the wireless communication module (24) of subsidiary engine (2) receives the measuring command of main frame (1) and transfers to subsidiary engine control module (21), the control module (11 of main and auxiliaries, 21) start corresponding GPS synchronization module (15 according to measuring command, 25), described GPS synchronization module (15,25) the output clock sync signal makes measurement module (12,22) voltage to electric energy meter and voltage transformer (VT) carries out synchronized sampling, the result that the control module (21) of subsidiary engine (2) will be sampled again sends to main frame (1) by its wireless communication module (24), the control module (11) of main frame (1) is calculated the ratio of secondary circuit, angular difference and voltage drop value, and by human-machine interface module (13,23) show.
2. voltage transformer secondary loop pressure drop sync detection device according to claim 1, it is characterized in that: described GPS synchronization module (15,25) comprise gps receiver (151,251), with described gps receiver (151,251) sampling pulse generator (152 that output terminal is electrically connected, 252), described gps receiver (151,251) be used to export synchronous low frequency pulse signal, described sampling pulse generator (152,252) be used to produce described measurement module (12,22) required high frequency sampling pulse, and described high frequency sampling pulse is forced in per second and gps receiver (151,251) Shu Chu low frequency pulse signal synchronously at least once.
3. voltage transformer secondary loop pressure drop sync detection device according to claim 2, it is characterized in that: described GPS synchronization module (15,25) also comprises pulse per second (PPS) detecting device (153,253), crystal oscillating circuit (154,254), described pulse per second (PPS) detecting device (153,253) is connected electrically between described gps receiver (151,251) output terminal and crystal oscillating circuit (154, the 254) output terminal, and the output terminal of described pulse per second (PPS) detecting device (153,253) and described sampling pulse generator (152,252) input end are electrically connected.
4. voltage transformer secondary loop pressure drop sync detection device according to claim 2 is characterized in that: the clocking error of described gps receiver (151,251) is less than 200ns.
5. voltage transformer secondary loop pressure drop sync detection device according to claim 1 is characterized in that: the voltage input end mouth of described measurement module (12,22) comprises phase three-wire three and two kinds of modes of connection of three-phase and four-line.
6. voltage transformer secondary loop pressure drop sync detection device according to claim 1 is characterized in that: the measurement module of described subsidiary engine (2) (12,22) thereby also have is used for being electrically connected with described voltage transformer (VT) and measures the electric current access interface of loop load to gather current signal on the voltage transformer (VT).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920142350 CN201438201U (en) | 2009-04-03 | 2009-04-03 | Secondary loop circuit voltage drop synchronous detection device for voltage mutual inductor |
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| CN 200920142350 CN201438201U (en) | 2009-04-03 | 2009-04-03 | Secondary loop circuit voltage drop synchronous detection device for voltage mutual inductor |
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| CN102130501A (en) * | 2011-01-19 | 2011-07-20 | 四川电力科学研究院 | Wireless synchronous data acquisition device for checking direct current transformer of direct current converter station |
| CN102175269A (en) * | 2011-01-24 | 2011-09-07 | 华东师范大学 | Sensor device capable of changing sampling frequency and control method thereof |
| CN102538132A (en) * | 2010-12-30 | 2012-07-04 | 珠海格力电器股份有限公司 | Air conditioner intelligent control method with auxiliary electric heating function |
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| CN103036250A (en) * | 2012-12-05 | 2013-04-10 | 江苏省电力公司常州供电公司 | Island detection and control method of distributed energy resource of safety automatic control system |
| CN103383444A (en) * | 2013-07-25 | 2013-11-06 | 国家电网公司 | Multi-terminal remote current transformer checking system based on global positioning system (GPS) |
| CN104316746A (en) * | 2014-10-14 | 2015-01-28 | 钱坤 | Smart measurement and computational analysis method of PT secondary circuit voltage and pressure drop |
| CN104535952A (en) * | 2015-01-12 | 2015-04-22 | 郑州万特电气股份有限公司 | Electricity use detection tester and allopatric wireless synchronous waveform sampling method thereof |
| CN105425688A (en) * | 2015-12-31 | 2016-03-23 | 深圳市科陆电子科技股份有限公司 | Analog-to-digital (AD) synchronous sampling value assigning method |
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| CN110954742A (en) * | 2019-11-21 | 2020-04-03 | 国网辽宁省电力有限公司营口供电公司 | Novel wireless voltage drop test method based on carrier communication |
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| CN102538132A (en) * | 2010-12-30 | 2012-07-04 | 珠海格力电器股份有限公司 | Air conditioner intelligent control method with auxiliary electric heating function |
| CN102538132B (en) * | 2010-12-30 | 2014-10-29 | 珠海格力电器股份有限公司 | Air conditioner intelligent control method with auxiliary electric heating function |
| CN102130501A (en) * | 2011-01-19 | 2011-07-20 | 四川电力科学研究院 | Wireless synchronous data acquisition device for checking direct current transformer of direct current converter station |
| CN102175269A (en) * | 2011-01-24 | 2011-09-07 | 华东师范大学 | Sensor device capable of changing sampling frequency and control method thereof |
| CN103036250B (en) * | 2012-12-05 | 2015-05-13 | 江苏省电力公司常州供电公司 | Island detection and control method of distributed energy resource of safety automatic control system |
| CN102969794A (en) * | 2012-12-05 | 2013-03-13 | 江苏省电力公司常州供电公司 | Automatic safety control system for island detection of distributed energy resources |
| CN103036250A (en) * | 2012-12-05 | 2013-04-10 | 江苏省电力公司常州供电公司 | Island detection and control method of distributed energy resource of safety automatic control system |
| CN102969794B (en) * | 2012-12-05 | 2015-11-18 | 江苏省电力公司常州供电公司 | For the automated security control system of the islanding detect of distributed energy |
| CN103383444B (en) * | 2013-07-25 | 2016-05-25 | 国家电网公司 | The remote current transformer check system of multiterminal based on GPS |
| CN103383444A (en) * | 2013-07-25 | 2013-11-06 | 国家电网公司 | Multi-terminal remote current transformer checking system based on global positioning system (GPS) |
| CN104316746A (en) * | 2014-10-14 | 2015-01-28 | 钱坤 | Smart measurement and computational analysis method of PT secondary circuit voltage and pressure drop |
| CN104535952A (en) * | 2015-01-12 | 2015-04-22 | 郑州万特电气股份有限公司 | Electricity use detection tester and allopatric wireless synchronous waveform sampling method thereof |
| CN105425688A (en) * | 2015-12-31 | 2016-03-23 | 深圳市科陆电子科技股份有限公司 | Analog-to-digital (AD) synchronous sampling value assigning method |
| CN106526417A (en) * | 2016-11-04 | 2017-03-22 | 聊城职业技术学院 | Cable fault tester and testing method thereof |
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| CN110954742A (en) * | 2019-11-21 | 2020-04-03 | 国网辽宁省电力有限公司营口供电公司 | Novel wireless voltage drop test method based on carrier communication |
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