CN104820201A - Acquisition terminal performance index evaluation method - Google Patents
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Abstract
The invention relates to an acquisition terminal performance index evaluation method for evaluating reliability performance of an acquisition terminal. The method comprises the following steps: 1) acquiring factors influencing normal running of the acquisition terminal; 2) building an acquisition terminal on-site simulation test platform according to the factors influencing the normal running of the acquisition terminal, and qualitatively performing a single-class influence factor test and a composite influence factor test on the acquisition terminal respectively; and 3) analyzing reliability and stability of the acquisition terminal according to data results of the single-class influence factor test and the composite influence factor test, recognizing a sensitive factor which generates a negative influence on the acquisition terminal, and evaluating overall performance of electric energy metering equipment. Compared with the prior art, the method has the advantages of full consideration, the wide application scope and the like, and is conductive to establishment of an evaluation system.
Description
Technical field
The present invention relates to power domain, especially relate to a kind of acquisition terminal performance index evaluation method.
Background technology
Electric energy is the important energy source of national economy, people's lives, plays the vital role of the development that promotes social harmony.Along with the continuous propelling that China's expanding economy and intelligent grid are built, a large amount of new technology and new equipment has been there is: collecting terminal, digital transformer substation, digital acquisition terminal etc. have widely used in China's electric system, the life style of the people there occurs deep change, Novel electric equipment constantly increases, these change and progress are had higher requirement to electric energy metrical, especially the intellectuality of electric energy metrical, networking, also more focus on its integrality and accuracy simultaneously.
Along with State Grid Corporation of China is to the attention further of electric energy measuring equipment quality management and control work, electric energy measuring equipment all must follow strict standard in design, manufacture, detection examination etc., can meet the requirement of power information capturing service with the collecting terminal and acquisition terminal that ensure connecting system.At present, the test in laboratory of electric energy measuring equipment has a set of comparatively perfect standard, for ensureing that product quality meets technical requirement.But operation maintenance aspect at the scene, electric energy measuring equipment still lacks corresponding means of testing and evaluation criterion, causes field apparatus to there is weak link in operational reliability and stability.The electric energy measuring equipment such as collecting terminal, acquisition terminal scene can be subject to the impact of various factors and accident when running, even if the equipment that test in laboratory is qualified also may damage because of the site environment of complexity, there is the mass defect such as measurement deviation or hydraulic performance decline.The difficulty of considerably increase on-the-spot investigation, dealing with problems, also easily causes metering dispute, customer complaint etc. to damage the event of Utilities Electric Co.'s image.Therefore, in order to ensure electric energy metrical accurately and reliably, information acquisition is timely and effective, be necessary to carry out full test to various uncertain factor before equipment is installed.
Summary of the invention
Object of the present invention is exactly provide a kind of to overcome defect that above-mentioned prior art exists and consider comprehensively, applied range, be conducive to the acquisition terminal performance index evaluation method of the foundation of appraisement system.
Object of the present invention can be achieved through the following technical solutions:
A kind of acquisition terminal performance index evaluation method, for evaluating the unfailing performance of acquisition terminal, comprises the following steps:
1) factor affecting acquisition terminal and normally run is obtained;
2) build acquisition terminal field simulation experiment porch according to affecting the factor that acquisition terminal normally runs, and respectively the test of single class influence factor and compound influence factorial experiments are carried out qualitatively to acquisition terminal;
3) analyze acquisition terminal reliability of operation and stability according to the data result of single class influence factor test and compound influence factorial experiments, tell the sensible factor that acquisition terminal is had a negative impact, evaluate electric energy measuring equipment overall performance.
Described step 1) in the factor affecting field electric energy measurement equipment dependability comprise electric changing factor, climatic environmental factor, electromagnetic compatibility factor, mechanical external force factor and human factor.
Described electric changing factor comprises mains voltage variations, sort time overcurrent, self-heating, pulse voltage is impacted, voltage dip or short interruptions, low power factor, wave form distortion, overload, dynamic load, impact load and voltage fluctuation, described climatic environmental factor comprises high/low temperature change, Alternate hot and humid and solar irradiation, described electromagnetic compatibility factor comprises static discharge, radio frequency electromagnetic field, the conduction interference of radio-frequency field induction, electricity fast-pulse group, lightning surge and attenuation oscillasion impulse, described mechanical external force factor comprises pressure, vibration, impact, calcination, corrosion, travel fatigue and drenching with rain.
Described step 3) in the test of single class influence factor comprise electric effect test and the impact test that communicate, described complex factors are tested and are superposed test for various factors simultaneously.
Described electric effect test comprises harmonic wave disturbed test, power supply impact test, load change test, voltage-drop and short interruptions test, decompression test and the test of electric current and voltage negative phase sequence, described communication affects test and comprises a copy reading success ratio test, cycle copy reading success ratio is tested, the test of electric energy meter data reading system accuracy rate and signal transmission characteristics test, described complex factors test comprises the combination test of analog line, communications success ratio is tested, test, the impact test that carrier communication normally works on acquisition system, copy reading success ratio test during load change and cycle copy reading test, copy reading success ratio test during humorous wave interference and cycle copy reading test.
Described compound influence factorial experiments comprise hot and humid under voltage fluctuation and load changing test, hot and humid under harmonic current extend testing, hot and humidly to test with the current expansion under three-phase imbalance and communication performance, low frequency radiation bends down conducted immunity frequently and tests and electromagnetic compatibility test under low frequency radiation.
Described power supply affect content measurement comprise power supply break phase, mains voltage variations, moment power-on and power-off, instantaneously overload and transient overvoltage.
Described signal transmission characteristics content measurement comprises frequency of carrier signal and level, carrier signal Maximum Output Level and frequency band outer interference level, receiving sensitivity, anti-interference and impedance adaptability.
Compared with prior art, the present invention has the following advantages:
One, consider comprehensively: acquisition terminal performance index evaluation method of the present invention take into account various environmental impact factor, can comprehensively test acquisition terminal performance and evaluate, effectively have evaluated the quality of acquisition terminal and reliability of operation and stability
Two, applied range: the present invention can not only the evaluation of the electric energy measuring equipment such as effectively evaluating acquisition terminal, can also according to actual needs, evaluate other electric energy terminals of electric power network.
Three, be conducive to the foundation of appraisement system: the present invention tests acquisition terminal performance and evaluates, for the evaluation of other equipment of later electric power network provides Data support, be conducive to the foundation of appraisement system.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Fig. 2 is concentrator analog acquisition terminal test platform structure figure.
Fig. 3 is special transformer terminals analog acquisition terminal test platform structure figure.
Fig. 4 is PD-5A low-voltage carrier communication test macro configuration diagram.
Fig. 5 is frequency of carrier signal and level detecting electrical block diagram.
Fig. 6 is carrier wave receiving sensitivity and anti-interference test structure schematic diagram.
Fig. 7 is impedance adaptive testing structural representation.
Fig. 8 is that analog line is in conjunction with test structure schematic diagram.
Fig. 9 is that carrier communication affects platform architecture schematic diagram to user environment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment:
As shown in Figure 1, a kind of acquisition terminal performance index evaluation method, for evaluating the unfailing performance of acquisition terminal, comprises the following steps:
1) factor affecting acquisition terminal and normally run is obtained;
2) build acquisition terminal field simulation experiment porch according to affecting the factor that acquisition terminal normally runs, and respectively the test of single class influence factor and compound influence factorial experiments are carried out qualitatively to acquisition terminal;
3) analyze acquisition terminal reliability of operation and stability according to the data result of single class influence factor test and compound influence factorial experiments, tell the sensible factor that acquisition terminal is had a negative impact, evaluate electric energy measuring equipment overall performance.
The experiment of acquisition terminal Dynamic simulation is by emulating real-time control to collecting device operating condition, obtain the information whether collecting device can normally work, data and the electric energy meter internal storage datas such as the electric flux of survey is called together in conjunction with main website, checking acquisition terminal energy accurate acquisition Various types of data and event, gather success ratio and meet code requirement.All kinds of collecting devices selected are current District of Shanghai equipment in use, and the structural drawing of test platform as shown in Figures 2 and 3.
Single class factorial experiments:
Electric effect is tested:
Such test mainly comprises the harmonic wave interference test of acquisition terminal, power supply impact test, load change test, voltage-drop and short interruptions test etc., and concrete test method is as follows:
1) harmonic wave interference test:
Build acquisition terminal analog testing platform according to above structural drawing, and in test loop, add harmonic wave test.
It is as follows that equipment can apply harmonic parameters:
Overtone order: 2 ~ 21 times; Harmonic content: electric current 2 ~ 21 times, amplitude range harmonic content 0-40% (relative to first-harmonic).Voltage 2 ~ 21 times, amplitude range harmonic content 0-40% (relative to first-harmonic).Harmonic phase: 0 ~ 359.99.
Apply humorous wave method (according to Q/GDW 1379.2-2013 4.3.7.2.2.4):
Keep loop voltage frequency to be 50HZ, input voltage is 80%, 100%, 120% of rated voltage, then applies 2 ~ 19 subharmonic voltages of input voltage 10%; Keep loop current frequency to be 50HZ, input current is 10%, 40%, 80%, 100%, 120% of Calibrated current, then applies 2 ~ 19 subharmonic currents of input current 10%.
In test process, electric energy measuring equipment should normally work, and the accuracy of acquisition terminal image data and collection success ratio should meet the requirement that DL/T 698 specifies, function and performance should meet the regulation of technical manual.
2) power supply impact test
(1) power supply breaks phase study:
Acquisition terminal uses AC three-phase four line or phase three-wire three to power, under the condition of a phase or two phase voltages of breaking, the normal work that AC power should be able to maintain acquisition terminal equipment with communicate, acquisition terminal correctly should be able to gather the disconnected record mutually of electric energy meter, and function and performance should meet the regulation of technical manual.
(2) mains voltage variations test:
Working power rated voltage: 0 ~ 220V/380V, permissible variation-20% ~+20%.
Frequency: 50Hz, permissible variation-6% ~+2%.
When supply voltage is changed to ultimate value by afore mentioned rules, collecting device should be able to normally work, and function and performance should meet the regulation of technical manual.
(3) moment power-on and power-off test:
Pick-up unit controls power supply simulation moment power-on and power-off, the duty of test acquisition terminal equipment and communication performance.Collecting device should be able to normally work, and function and performance should meet the regulation of technical manual.
(4) moment overload test:
Pick-up unit controls power supply simulation and transships instantaneously, and voltage reaches 130%Un and electric current reaches 120%In, continues 50ms.Collecting device should be able to normally work, and function and performance should meet the regulation of technical manual.
(5) transient overvoltage test:
Pick-up unit controls power supply simulation transient overvoltage, and voltage reaches 200%Un, continues 50ms.Collecting device should be able to normally work, and function and performance should meet the regulation of technical manual.
3) load change test:
Pick-up unit simulated field load situation of change, the parameters such as voltage, electric current, frequency, power factor constantly can change separately or in a joint manner according to being set in advance in a period of time, the communication acquisition performance of test collecting device under load situation of change.
Load variation range: voltage: 80% ~ 100%Un; Electric current :-100% ~+100%In; Frequency: 48Hz ~ 50Hz; Power factor: 0 ~ 1.0.
4) voltage-drop and short interruptions test:
Specify according in IEC1000-4-11, and carry out under the following conditions:
(1) voltage test class 4 0%Un
60 are fallen temporarily from rated voltage; Duration: 1min, 3000 cycles; Landing number of times: 1 time.
(2) voltage test grade 0%Un
100 are fallen temporarily from rated voltage; Duration: 1s, 50 cycles; Interruption times: 3 times, 10s release time between interrupting for each time.
(3) voltage test grade 0%Un
100 are fallen temporarily from rated voltage; Break period: 20ms, 1 cycle; Interruption times: 1 time.
The sudden change of above supply voltage occurs in voltage zero-cross place.
When voltage-drop and short interruptions test, each equipment of system and composition system should not damage or crash, and after test, each equipment of system and composition system should be able to normally work, and the data of systematic conservation should be unchanged.
5) decompression test:
Decompression differentiates: access voltage is less than or equal to starting voltage (78% ± 2V of rated voltage) and in corresponding current return, electric current is more than or equal to 25mA.
Pick-up unit simulates single-phase decompression, two-phase decompression and full decompression respectively, and each decompression continues 5min.After test, each equipment of system and composition system should be able to normally work, and the data of systematic conservation should be unchanged.
6) voltage (stream) negative phase sequence test:
Pick-up unit analog voltage (stream) negative phase sequence runs.After test, each equipment of system and composition system should be able to normally work, and the data of systematic conservation should be unchanged.
Communication is tested:
Such experiment comprises a copy reading success ratio test, the test of cycle copy reading success ratio, the test of electric energy meter data reading system accuracy rate and signal transmission characteristics test, and concrete test method is as follows:
1) a copy reading success ratio test
Acquisition terminal analogue simulation operation platform carries out copy reading test.
A copy reading success ratio of the accumulative energy data of user's electric energy meter is by following formulae discovery:
Copy reading success ratio=(total degree of successful number of times of copy reading/answer copy reading) × 100%
Acquisition terminal to the accumulative energy data of user's electric energy meter with the electric energy reading of all electric energy meters of interval copy reading primary system of 60min, carry out the copy reading being no less than 400 times altogether, record the data at every turn copied and accepted, adding up a copy reading success ratio should at least meet table 1 requirement.Table 1 is Laboratory Request, and table 2 is on-the-spot service requirement.
Table 1 test condition copy reading success ratio next time index (Q/GDW 1373-2013)
| Downlink channel of terminal type | A copy reading success ratio % |
| Wired | >98 |
| Wireless | >90 |
| Power line carrier | >90 |
Table 2 test condition copy reading success ratio next time index (DL/T 698)
| Downlink channel of terminal type | A copy reading success ratio % |
| Wired | >98 |
| Wireless | >90 |
| Power line carrier | >80 |
2) cycle copy reading success ratio test
In the enterprising line period copy reading test of acquisition terminal analogue simulation operation platform.
The cycle copy reading success ratio of the accumulative energy data of user's electric energy meter is by following formulae discovery:
Cycle copy reading success ratio=(total degree of the successful number of times of cycle copy reading/answer copy reading) × 100%
Acquisition terminal is to the accumulative energy data of user's electric energy meter with the electric energy reading of all electric energy meters of interval copy reading primary system of 60min, and record the data at every turn copied and accepted, take 24h as cycle measurement period copy reading success ratio, cycle success ratio should at least meet table 3 requirement.Table 3 is Laboratory Request, and on-the-spot service requirement is 100% success ratio.
Table 3 test condition copy reading of lower cycle success ratio index (Q/GDW 1373-2013)
| Downlink channel of terminal type | Cycle (day) copy reading success ratio % |
| Wired | >99.9 |
| Wireless | >98 |
| Power line carrier | >98 |
3) electric energy meter data reading system accuracy rate test
After electric energy meter passes to rated current Ib (In) 24h, first read initialization difference △ E, then pass to test current I (0.01In<I<Imax) operation.Acquisition system calls the electric energy reading E of recording electric energy meter together every 1h, and reading accuracy is 0.1kWh.Wherein test current I is no less than 50kWh at the operation reading of 0.01 ~ 0.02In.Run duration, interrupts power supply 3 ~ 4 times in the every 24h of voltage circuit.The difference reading E and E0 after running should meet the following requirements.
At the scene under service condition, the difference that user's electric energy meter that acquisition system reads adds up the electric flux indicating value E0 of electric energy meter reading E and user's Electric energy meter KWh counter should meet following requirements:
|E-E
0-ΔE|≤0.05％E
0+1×10
-(α+1)+γ×10
-β
Wherein, E0 during E-initialization during △ E=initialization, α is the decimal digits of user's Electric energy meter KWh counter, and β is the decimal digits of system power meter reading, and γ is carry errors.
4) signal transmission characteristics test
Below test and all carry out signal transmission characteristics test by communication test experiment porch, as shown in Figure 4.
(1) test of frequency of carrier signal and level
Fig. 5 is shown in by the test circuit of frequency of carrier signal and level.Utilize the artificial mains network specified in spectrum analyzer and figure, frequency of carrier signal and level detecting are carried out to the equipment on tested emulation platform.Frequency of carrier signal and level limit value should meet the requirement of table 2.
(2) carrier signal Maximum Output Level and the outer interference level test of frequency band
Make electric energy measuring equipment be in continuous transmission state, in carrier frequency band, find out output level peak with frequency spectrograph, level value is now denoted as V1.Outside carrier frequency band, find out output level peak, level value is now denoted as V2.The value of V1 and V2 should meet the requirement of table 4 and table 5:
Table 4 output signal level limit value
Outer disturbance level limit value is with by table 5
(3) receiving sensitivity test
Receiving sensitivity test structure is as Fig. 6, and can test multicarrier receiver normally receive the signal of multicarrier transmitter under certain decay.Program control signal attenuator is effectively decayed for carrier signal, and attenuation range can reach the minimum levels requirement of sensitivity measure.Receiving sensitivity is the minimum levels requirement of communication success ratio when being not less than 50%.
(4) anti-interference test
The high-speed d/a of anti-interference test noise simulator inside can restore various noise signal effectively, and comprise the noise signal from scene record ripple, its effective bandwidth and output amplitude directly reflect the size of on-the-spot noise.Anti-interference grade is the signal to noise ratio (S/N ratio) of communication success ratio when being not less than 50%.
(5) impedance adaptive testing
Impedance adaptive testing structure as shown in Figure 7, dissimilar impedance topological structure, according to cell impedance is in parallel and the combination of the different modes of series model, can change corresponding impedance operator on test loop, test macro presets the various classes of impedance under different carrier frequencies.
Complex factors are tested:
The binding tests of analog line:
Analog line is shown in Fig. 8 in conjunction with test structure, the principal character of low-voltage circuit is comprised carrier signal attenuation characteristic, interference characteristic and impedance variation characteristic and combines by test, by the variable of system simulation corresponding state, the overall receptivity of examination carrier communication product under simulation low-voltage circuit.
Communications success ratio is tested:
1) communication experiment under hot conditions
When hot test, simulate the extreme weather conditions in District of Shanghai summer, acquisition terminal equipment 55 DEG C, 90%RH or 70 DEG C, 90%RH time working properly, collecting device is with the data copying and accepting interval automatic transcription electric energy meter of 5min, copy and accept number of times and be no less than 30 times, record the data at every turn copied and accepted, after test, statistics communication success ratio is not less than 95%.
2) communication experiment under cryogenic conditions
When low-temperature test, simulate the extreme weather conditions in District of Shanghai winter, acquisition terminal equipment-10 DEG C, 20%RH or-25 DEG C, 20%RH be working properly, collecting device is with the data copying and accepting interval automatic transcription electric energy meter of 5min, copy and accept number of times and be no less than 30 times, record the data at every turn copied and accepted, after test, statistics communication success ratio is not less than 95%.
As shown in Figure 9, carrier communication at the scene in environment (all kinds of earth leakage protective device) on the impact test that acquisition system normally works:
A system be made up of collecting device and electric energy meter, adopts test machine to control collecting device transmission carrier meter reading signal and checks meter in real time, check meter and be spaced apart 30s, be no less than 200 times altogether and copy and accept, statistics earth leakage protective device tripping operation number of times.The size of change leakage capacitance C1, C2 simulates dissimilar earth leakage protective device, and contrast carrier communication is on the impact of dissimilar earth leakage protective device.Test should meet following requirement:
C1=C2=200nF, earth leakage protective device should reliably not trip.
C1=C2=220nF, earth leakage protective device reliably not trip-out rate should be greater than 90%.
When the earth leakage protective device of C1=C2=300nF is tested, require as follows:
Mechanical type earth leakage protective device: carrier communication is without impact; Chip type and be not with filtering: carrier communication causes tripping operation; Chip type and band filtering: carrier communication is without impact.
Copy reading success ratio test during load change and cycle copy reading test:
By acquisition terminal analoging detecting device simulated field load situation of change, the parameters such as voltage, electric current, frequency, power factor constantly can change separately or in a joint manner according to being set in advance in a period of time (variation range limit value is as the load change test in individual event emulation experiment), carry out a copy reading and cycle copy reading test (as time copy reading of in individual event l-G simulation test and cycle copy reading test) under different changes.
Copy reading success ratio test during humorous wave interference and cycle copy reading test:
A copy reading and cycle copy reading test is carried out while applying humorous wave interference by acquisition terminal analoging detecting device in test loop.
It is as follows that equipment can apply harmonic parameters:
Overtone order: 2 ~ 21 times; Harmonic content: electric current 2 ~ 21 times, amplitude range harmonic content 0-40% (relative to first-harmonic).Voltage 2 ~ 21 times, amplitude range harmonic content 0-40% (relative to first-harmonic).Harmonic phase: 0 ~ 359.99.
Apply humorous wave method (according to Q/GDW 1379.2-2013 4.3.7.2.2.4):
Keep loop voltage frequency to be 50HZ, input voltage is 80%, 100%, 120% of rated voltage, then applies 2 ~ 19 subharmonic voltages of input voltage 10%; Keep loop current frequency to be 50HZ, input current is 10%, 40%, 80%, 100%, 120% of Calibrated current, then applies 2 ~ 19 subharmonic currents of input current 10%.
Claims (8)
1. an acquisition terminal performance index evaluation method, for evaluating the unfailing performance of acquisition terminal, is characterized in that, comprising the following steps:
1) factor affecting acquisition terminal and normally run is obtained;
2) build acquisition terminal field simulation experiment porch according to affecting the factor that acquisition terminal normally runs, and respectively the test of single class influence factor and compound influence factorial experiments are carried out qualitatively to acquisition terminal;
3) analyze acquisition terminal reliability of operation and stability according to the data result of single class influence factor test and compound influence factorial experiments, tell the sensible factor that acquisition terminal is had a negative impact, evaluate electric energy measuring equipment overall performance.
2. the method for evaluating reliability of a kind of electric energy measuring equipment according to claim 1, it is characterized in that, described step 1) in the factor affecting field electric energy measurement equipment dependability comprise electric changing factor, climatic environmental factor, electromagnetic compatibility factor, mechanical external force factor and human factor.
3. the method for evaluating reliability of a kind of electric energy measuring equipment according to claim 2, it is characterized in that, described electric changing factor comprises mains voltage variations, sort time overcurrent, self-heating, pulse voltage is impacted, voltage dip or short interruptions, low power factor, wave form distortion, overload, dynamic load, impact load and voltage fluctuation, described climatic environmental factor comprises high/low temperature change, Alternate hot and humid and solar irradiation, described electromagnetic compatibility factor comprises static discharge, radio frequency electromagnetic field, the conduction interference of radio-frequency field induction, electricity fast-pulse group, lightning surge and attenuation oscillasion impulse, described mechanical external force factor comprises pressure, vibration, impact, calcination, corrosion, travel fatigue and drenching with rain.
4. the method for evaluating reliability of a kind of electric energy measuring equipment according to claim 1, it is characterized in that, described step 3) in the test of single class influence factor comprise electric effect test and the impact test that communicate, described complex factors are tested and are superposed test for various factors simultaneously.
5. the method for evaluating reliability of a kind of electric energy measuring equipment according to claim 4, it is characterized in that, described electric effect test comprises harmonic wave disturbed test, power supply impact test, load change test, voltage-drop and short interruptions test, decompression test and the test of electric current and voltage negative phase sequence, described communication affects test and comprises a copy reading success ratio test, cycle copy reading success ratio is tested, the test of electric energy meter data reading system accuracy rate and signal transmission characteristics test, described complex factors test comprises the combination test of analog line, communications success ratio is tested, test, the impact test that carrier communication normally works on acquisition system, copy reading success ratio test during load change and cycle copy reading test, copy reading success ratio test during humorous wave interference and cycle copy reading test.
6. the method for evaluating reliability of a kind of electric energy measuring equipment according to claim 4, it is characterized in that, described compound influence factorial experiments comprise hot and humid under voltage fluctuation and load changing test, hot and humid under harmonic current extend testing, hot and humidly to test with the current expansion under three-phase imbalance and communication performance, low frequency radiation bends down conducted immunity frequently and tests and electromagnetic compatibility test under low frequency radiation.
7. the method for evaluating reliability of a kind of electric energy measuring equipment according to claim 5, is characterized in that, described power supply affect content measurement comprise power supply break phase, mains voltage variations, moment power-on and power-off, instantaneously overload and transient overvoltage.
8. the method for evaluating reliability of a kind of electric energy measuring equipment according to claim 5, it is characterized in that, described signal transmission characteristics content measurement comprises frequency of carrier signal and level, carrier signal Maximum Output Level and frequency band outer interference level, receiving sensitivity, anti-interference and impedance adaptability.
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| CN106330260A (en) * | 2016-08-23 | 2017-01-11 | 杭州海兴电力科技股份有限公司 | Laboratory test device and method of low-voltage power line carrier performance |
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| CN111551695A (en) * | 2020-04-23 | 2020-08-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Long-term operation reliability test method for online monitoring device for dissolved gas in oil |
| CN112684299A (en) * | 2021-01-19 | 2021-04-20 | 浙江大学 | High fault-tolerant identification method and device for power feeder line fault section by using voltage loss information |
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