CN107064855A - Secondary circuit voltage drop monitoring system and method - Google Patents

Secondary circuit voltage drop monitoring system and method Download PDF

Info

Publication number
CN107064855A
CN107064855A CN201710235515.3A CN201710235515A CN107064855A CN 107064855 A CN107064855 A CN 107064855A CN 201710235515 A CN201710235515 A CN 201710235515A CN 107064855 A CN107064855 A CN 107064855A
Authority
CN
China
Prior art keywords
circuit
voltage
verification
terminal
waveform signal
Prior art date
Application number
CN201710235515.3A
Other languages
Chinese (zh)
Inventor
赵林
徐占河
姜振宇
丁恒春
袁瑞铭
李连浩
高帅
王婷
许琦
Original Assignee
华北电力科学研究院有限责任公司
国网冀北电力有限公司电力科学研究院
国家电网公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 华北电力科学研究院有限责任公司, 国网冀北电力有限公司电力科学研究院, 国家电网公司 filed Critical 华北电力科学研究院有限责任公司
Priority to CN201710235515.3A priority Critical patent/CN107064855A/en
Publication of CN107064855A publication Critical patent/CN107064855A/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/04Testing or calibrating of apparatus covered by the preceding groups of instruments for measuring time integral of power or current
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/04Measuring peak values or amplitude or envelope of ac or of pulses

Abstract

The invention provides a kind of secondary circuit voltage drop monitoring system and method, wherein secondary circuit voltage drop monitoring system includes:First verification sampling terminal, the second verification sampling terminal and verification terminal;First verification sampling terminal is connected to the voltage transformer port of export of secondary circuit, the voltage waveform signal of the voltage transformer port of export for gathering secondary circuit, and sends it to verification terminal;Second verification sampling terminal is connected to the electric energy meter input of secondary circuit, the voltage waveform signal of the electric energy meter input for gathering secondary circuit, and sends it to verification terminal;The voltage waveform signal of the terminal receiving voltage transformer port of export and the voltage waveform signal at electric energy meter input port end are verified, the Secondary Circuit of Potential Transformer pressure drop of secondary circuit is calculated and monitor.

Description

Secondary circuit voltage drop monitoring system and method
Technical field
Field, more particularly to a kind of secondary circuit voltage drop monitoring system and method are verified the present invention relates to secondary circuit.
Background technology
Current secondary circuit voltage drop remote verification technology mainly sets STANDARD MEASURING APPARATUS FOR at the scene, passes through electric current electricity The mode of loop switch is pressed, the error checking to live multiple electric energy meters is realized, and pass check results back long-range main website.But this Method of calibration there are problems that standard set-up by site environment influenceed greatly, switching circuit is complicated, monitoring data, it is impossible to it is right The error of electric energy meter is monitored in real time.Every time when carrying out live accuracy test to electric energy meter, it is necessary to by the electric current of tested table Loop is connected with standard scale, the voltage circuit of tested table is in parallel with standard scale, thus the binding post on measuring screen is entered Row, which unclamps and screwed, waits operation, often has binding post loosening or the phenomenon such as stripped thread after multi-pass operation, there is larger failure hidden Suffer from.And because scene does not possess experimental condition, it is therefore desirable to dismount and be sent to specified laboratory field apparatus and examined and determine Or calibration, i.e., it should carry out as regular traffic, by expending substantial amounts of manpower, material resources and financial resources, to increase many burdens using unit.
The content of the invention
It is an object of the invention to provide one kind remote verification metering device real-time, accurate, easy to operate, for secondary Loop pressure drop is monitored.
In order to achieve the above object, the present invention proposes a kind of secondary circuit voltage drop monitoring system, including:First verification is adopted Sample terminal, the second verification sampling terminal and verification terminal;The first verification sampling terminal is connected to the voltage of secondary circuit The transformer port of export, the voltage waveform signal of the voltage transformer port of export for gathering the secondary circuit, and be sent to To the verification terminal;The second verification sampling terminal is connected to the electric energy meter input of the secondary circuit, for gathering The voltage waveform signal of the electric energy meter input of the secondary circuit, and send it to the verification terminal;The verification is eventually End receives the voltage waveform signal of the voltage transformer port of export and the voltage waveform signal at electric energy meter input port end, and calculates The Secondary Circuit of Potential Transformer pressure drop of the secondary circuit.
Further, in addition to the first isolating transformer, the first described verification sampling terminal passes through the first isolation transformation The voltage transformer port of export in device connecting secondary loop.
Further, in addition to the second isolating transformer, the second described verification sampling terminal passes through the second isolation transformation The electric energy meter input in device connecting secondary loop.
Further, the verification terminal is connected to the company of the first verification sampling terminal and the second verification sampling terminal Mode is connect for wireless connection.
Further, the first verification sampling terminal is synchronized with the second verification sampling terminal using synchronization module.
Further, the synchronization module is high-precision GPS time service module.
Further, in addition to synchronizing cable, the synchronizing cable is connected to the first verification sampling terminal and second Verification sampling terminal, for transmitting synchronizing signal and/or test data.
Further, the first verification sampling terminal and the second verification sampling terminal are multiple, for gathering multiple two The voltage waveform signal of the voltage transformer port of export of minor loop and the voltage waveform signal of electric energy meter input, and be sent to To the verification terminal.
In order to achieve the above object, it is also proposed that a kind of secondary circuit voltage drop monitoring method, including:Adopted using the first verification The voltage waveform signal of the voltage transformer port of export of sample terminal collection secondary circuit;Use the second verification sampling terminal collection institute State the voltage waveform signal of the electric energy meter input of secondary circuit;Using verification terminal according to the voltage transformer port of export The voltage waveform signal of voltage waveform signal and electric energy meter input, calculates the Secondary Circuit of Potential Transformer of the secondary circuit Pressure drop.
Further, the voltage of the voltage transformer port of export using the first verification sampling terminal collection secondary circuit The step of waveform signal and the voltage waveform of the electric energy meter input using the second verification sampling terminal collection secondary circuit The step of signal is synchronization implementation.
The beneficial effects of the present invention are, the head end in secondary circuit and end by the present invention, that is, mutual induction of voltage The port of the secondary side of device and the input port of electric energy meter, while measuring the voltage data at two and calculating the pressure of secondary circuit Drop, reaches the purpose of monitoring secondary circuit voltage drop, and the measurement accuracy of angular difference, and nothing easy for installation can be effectively ensured in synchro measure Cable need to additionally be set up, it is possible to achieve monitoring in real time.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only Some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, also Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 is the secondary circuit voltage drop monitoring system of the embodiment of the present invention and the connection diagram of secondary circuit.
Fig. 2 is the Secondary Circuit of Potential Transformer drop measurement schematic diagram of the embodiment of the present invention.
Fig. 3 is the Secondary Circuit of Potential Transformer voltage vector diagram of the embodiment of the present invention.
Fig. 4 is the secondary circuit voltage drop monitoring system of another embodiment of the present invention and the connection diagram of secondary circuit.
Fig. 5 is the flow chart of the secondary circuit voltage drop monitoring method of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this Embodiment in invention, the every other reality that relevant technical staff in the field is obtained under the premise of creative work is not made Example is applied, the scope of the protection of the present invention is belonged to.
, it is necessary to install electric energy measuring equipment at the critical point that power grid enterprises settle accounts with user.In actual circuit, voltage is mutual The primary side of sensor is connected to primary circuit, and secondary side is connected to secondary circuit.The secondary circuit is mutually connected by secondary device Connect, constitute the electric loop for being monitored, control, adjusting and protecting to primary equipment.Because wire is longer in secondary circuit, and And also various contacts, and various loads can be connected in the end or middle part of secondary circuit, so will produce secondary The pressure drop in loop.Pressure drop on secondary circuit can cause the voltage on energy meter terminal to be not equal to the end of voltage transformer secondary side Mouth voltage, its amplitude and phase can all change, so that the measurement to electric energy and power brings error.The main of the present invention is adopted Head end and end used in secondary circuit, that is, voltage transformer secondary side port and the input port of electric energy meter, Measure the voltage data at two simultaneously and calculate the pressure drop of secondary circuit, so as to realize the purpose of monitoring secondary circuit voltage drop.It is main Generating online critical point, inter-network clearing critical point and the responsible consumer metering secondary voltage transformer pressure drop being used in transformer station Verification.Other situations, can be adopted according to metering device significance level, secondary circuit length electric energy meter class of accuracy configuration high-speed Collect the amount of acquisition channels of terminal, realize the monitoring of Secondary Circuit of Potential Transformer pressure drop.
Fig. 1 is the secondary circuit voltage drop monitoring system of the embodiment of the present invention and the connection diagram of secondary circuit.Such as Fig. 1 institutes Show, the secondary circuit voltage drop monitoring system that the present embodiment is proposed includes:First verification sampling terminal, second verification sampling terminal with And verification terminal;The first verification sampling terminal is connected to the voltage transformer port of export of secondary circuit, described for gathering The voltage waveform signal of the voltage transformer port of export of secondary circuit, and send it to the verification terminal;Second school Test the electric energy meter input that sampling terminal is connected to the secondary circuit, the electric energy meter input for gathering the secondary circuit Voltage waveform signal, and send it to the verification terminal;The verification terminal receives the voltage transformer port of export Voltage waveform signal and electric energy meter input port end voltage waveform signal, and calculate the voltage transformer two of the secondary circuit Minor loop pressure drop.
Fig. 2 is the Secondary Circuit of Potential Transformer drop measurement schematic diagram of the embodiment of the present invention, and Fig. 3 is the embodiment of the present invention Secondary Circuit of Potential Transformer voltage vector diagram.With reference to shown in Fig. 2 and Fig. 3, with any single-phase secondary circuit in three-phase electricity Exemplified by, the Computing Principle of the secondary circuit voltage drop monitoring system monitoring voltage transformer secondary circuit pressure drop of the present embodiment is as follows:
Secondary Circuit of Potential Transformer pressure drop is divided into than poor f and angular difference δ, is the voltage transformer port of export and electric energy than poor f The difference in magnitude of voltage is relative to the percentage of secondary actual voltage value between table input, and angular difference δ is the voltage transformer port of export And between electric energy meter input voltage phase difference.
The calculation formula of secondary line voltage drop of voltage mutual inductor is:
The ratio difference of Secondary Circuit of Potential Transformer is:
The angular difference value of Secondary Circuit of Potential Transformer pressure drop is:
For the voltage vector of the voltage transformer port of export of the secondary circuit of the first verification sampling terminal measurement, UTFor it Amplitude;For the voltage vector of the electric energy meter input of the secondary circuit of the second verification sampling terminal measurement, UMFor its amplitude; I is PT load currents in Fig. 3;R is that voltage transformer secondary line resistance (including cable resistance, insurance, is switched and joint etc. Resistance));F is poor for the ratio of Secondary Circuit of Potential Transformer pressure drop, and δ is the angular difference of Secondary Circuit of Potential Transformer pressure drop.
When it is implemented, the first verification sampling terminal samples terminal in factory calibration with the second verification, using synchronous many Point calibration method, ensures that the first verification sampling terminal is consistent with the second verification sampling end error, it is to avoid instrument is in itself as far as possible Error is impacted to measurement result.First verification sampling terminal is carried out with the second verification sampling terminal using digital sample mode Collection voltages waveform signal, is not in wide swings, the first verification sampling because transformer substation voltage is general all more stable Range can be adjusted to maximum position by terminal when measuring transformer output voltage, and 24 bit AD sample cores can be played to greatest extent The performance of piece, sampling precision can reach 0.5 ‰ substantially, and the measurement of secondary circuit voltage drop is ensure that substantially.First verification sampling Terminal is with the second verification sampling terminal in measurement, and voltage circuit sampling uses high impedance method, and more than input impedance 2M Ω will not The state of original secondary circuit is destroyed because having accessed verification monitoring device.
When it is implemented, between the first verification sampling terminal and the voltage transformer port of export of secondary circuit, can set up First isolating transformer, the first described verification sampling mutual induction of voltage of the terminal by the first isolating transformer connecting secondary loop The device port of export, by the primary side and buffer action protection the first sampling terminal of secondary side of the first isolating transformer, while Dangerous voltage protection personal safety can be isolated.Likewise, the electric energy meter in the second verification sampling terminal and secondary circuit is inputted Between end, the second isolating transformer can be also set up, the second described verification sampling terminal connects two by the second isolating transformer The electric energy meter input of minor loop, can also realize the sampling terminal of insulation blocking second, isolation dangerous voltage protection personal safety Effect.
When it is implemented, verification terminal is connected to the connected mode of the first verification sampling terminal and the second verification sampling terminal For wireless connection, laying measurement cable, convenient monitoring can be avoided, it is possible to achieve monitoring in real time.In order to ensure that time of measuring is same Step, the first verification sampling terminal is synchronized with the second verification sampling terminal using synchronization module, by high-precise synchronization signal, The measurement accuracy of angular difference can be effectively ensured, synchronization module is high-precision GPS time service module.Synchronization module can be preferably Switzerland's life The LEA-6TGPS modules of production, it can be to need the application of positional information to provide accurate GPS time services service, and the GPS module can The time pulse frequency of output is configured, goes to compensate the granularity error in time pulse by using quantization error information.When first When verification sampling terminal is run with the second verification sampling terminal under fixed position, GPS module can in only one satellite Time service is carried out in the case of degree of opinion.This means even in the situation that gps satellite signal condition is unfavorable or sky visibility is not good Under can also export correct time information.The built-in markers and counter of the module can carry out accurate to external event input Time measurement.When principal and subordinate's verification acquisition terminal is in satellite-signal shielding area, special synchronizing cable, synchronization can be used The modes such as optical fiber are synchronized, and simply need to lay synchronizing cable, optical fiber, the synchronizing cable or light are connected to first school Sampling terminal and the second verification sampling terminal are tested, for transmitting synchronizing signal and/or test data, guarantee secondary returning is equally played The voltage waveform signal of the voltage waveform signal of the voltage transformer port of export on road and the electric energy meter input of secondary circuit is simultaneously The effect of monitoring.
Fig. 4 is the secondary circuit voltage drop monitoring system of another embodiment of the present invention and the connection diagram of secondary circuit.Such as Shown in Fig. 4, the first verification sampling terminal is multiple with the second verification sampling terminal, and the voltage for gathering multiple secondary circuits is mutual The voltage waveform signal of the sensor port of export and the voltage waveform signal of electric energy meter input, and send it to verification terminal.Should Verification terminal is arranged in metering remote verification main website, receives the voltage waveform of the voltage transformer port of export of multiple secondary circuits The voltage waveform signal of signal and electric energy meter input, calculates it, after the pressure drop for calculating each secondary circuit, will supervise Survey result and be supplied to technical staff, facilitate technical staff that multiple secondary circuits are carried out with unified monitoring and management, and save Manpower consumption.
After a kind of secondary circuit voltage drop monitoring system of the embodiment of the present invention is described, next, to of the invention real A kind of secondary circuit voltage drop monitoring method for applying example is introduced.
Fig. 5 is the flow chart of the secondary circuit voltage drop monitoring method of the embodiment of the present invention.As shown in figure 5, the present embodiment is carried The secondary circuit voltage drop monitoring method gone out, including:
S100, the voltage waveform letter for the voltage transformer port of export of terminal collection secondary circuit of being sampled using the first verification Number;
S200, the voltage waveform letter for the electric energy meter input of the terminal collection secondary circuit of being sampled using the second verification Number;
S300, uses voltage waveform signal and electric energy meter input of the verification terminal according to the voltage transformer port of export Voltage waveform signal, calculate the Secondary Circuit of Potential Transformer pressure drop of the secondary circuit.
In the specific implementation, in order to ensure that time of measuring is synchronous, the first verification sampling terminal collection secondary circuit is used The step S100 of the voltage waveform signal of the voltage transformer port of export using the second verification sampling terminal with gathering the secondary returning The step S200 of the voltage waveform signal of the electric energy meter input on road is synchronization implementation, the first verification sampling terminal and the second verification Sampling terminal is synchronized using synchronization module, is measured by high-precise synchronization, the measurement accuracy of angular difference can be effectively ensured.
The beneficial effects of the present invention are pass through the head end in secondary circuit and end, that is, voltage by the present invention The port of the secondary side of transformer and the input port of electric energy meter, while measuring the voltage data at two and calculating secondary circuit Pressure drop, reach the purpose of monitoring secondary circuit voltage drop, the measurement accuracy of angular difference, and the side of installation can be effectively ensured in synchro measure Just without additionally setting up cable, it is possible to achieve monitoring in real time.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included Within protection scope of the present invention.

Claims (10)

1. a kind of secondary circuit voltage drop monitoring system, it is characterised in that including:First verification sampling terminal, the second verification sampling Terminal and verification terminal;
The first verification sampling terminal is connected to the voltage transformer port of export of secondary circuit, for gathering the secondary circuit The voltage transformer port of export voltage waveform signal, and send it to the verification terminal;
The second verification sampling terminal is connected to the electric energy meter input of the secondary circuit, for gathering the secondary circuit Electric energy meter input voltage waveform signal, and send it to the verification terminal;
The verification terminal receives the voltage waveform signal of the voltage transformer port of export and the voltage at electric energy meter input port end Waveform signal, calculates and monitors the pressure drop of the secondary circuit.
2. secondary circuit voltage drop monitoring system according to claim 1, it is characterised in that also including the first isolation transformation Device, the voltage transformer that the first described verification sampling terminal connects the secondary circuit by first isolating transformer goes out Mouth end.
3. secondary circuit voltage drop monitoring system according to claim 1, it is characterised in that also including the second isolation transformation Device, the electric energy meter that the second described verification sampling terminal connects the secondary circuit by second isolating transformer is inputted End.
4. secondary circuit voltage drop monitoring system according to claim 1, it is characterised in that the verification terminal is connected to institute The mode for stating the first verification sampling terminal and the second verification sampling terminal is wireless connection.
5. secondary circuit voltage drop monitoring system according to claim 1, it is characterised in that the first verification sampling terminal Synchronized with the second verification sampling terminal using synchronization module.
6. secondary circuit voltage drop monitoring system according to claim 5, it is characterised in that the synchronization module is high accuracy GPS time service modules.
7. secondary circuit voltage drop monitoring system according to claim 1, it is characterised in that described also including synchronizing cable Synchronizing cable is connected to the first verification sampling terminal and the second verification sampling terminal, for transmitting synchronizing signal and/or survey Try data.
8. secondary circuit voltage drop monitoring system according to claim 1, it is characterised in that the first verification sampling terminal It is multiple, the voltage waveform signal of the voltage transformer port of export for gathering multiple secondary circuits with the second verification sampling terminal With the voltage waveform signal of electric energy meter input, and the verification terminal is sent it to.
9. a kind of secondary circuit voltage drop monitoring method, it is characterised in that including:
Gather the voltage waveform signal of the voltage transformer port of export of secondary circuit;
Gather the voltage waveform signal of the electric energy meter input of the secondary circuit;
According to the voltage waveform signal of the voltage transformer port of export and the voltage waveform signal of electric energy meter input, institute is calculated State the Secondary Circuit of Potential Transformer pressure drop of secondary circuit.
10. secondary circuit voltage drop monitoring method according to claim 9, it is characterised in that the collection secondary circuit The voltage waveform signal of electric energy meter input of the voltage waveform signal of the voltage transformer port of export with gathering the secondary circuit Mode be synchronous acquisition.
CN201710235515.3A 2017-04-12 2017-04-12 Secondary circuit voltage drop monitoring system and method CN107064855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710235515.3A CN107064855A (en) 2017-04-12 2017-04-12 Secondary circuit voltage drop monitoring system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710235515.3A CN107064855A (en) 2017-04-12 2017-04-12 Secondary circuit voltage drop monitoring system and method

Publications (1)

Publication Number Publication Date
CN107064855A true CN107064855A (en) 2017-08-18

Family

ID=59602688

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710235515.3A CN107064855A (en) 2017-04-12 2017-04-12 Secondary circuit voltage drop monitoring system and method

Country Status (1)

Country Link
CN (1) CN107064855A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110133562A (en) * 2019-04-03 2019-08-16 华电电力科学研究院有限公司 A kind of Secondary Circuit of Potential Transformer pressure drop on-site test system and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08264602A (en) * 1995-03-22 1996-10-11 Hitachi Ltd Lsi voltage measuring method
CN201434887Y (en) * 2009-05-27 2010-03-31 安徽省电力公司阜阳供电公司 On-line monitoring unit for secondary loop voltage drop
CN202502134U (en) * 2012-03-27 2012-10-24 上海市电力公司 Secondary voltage drop detection device for voltage transformer
CN204065388U (en) * 2014-03-28 2014-12-31 云南电力试验研究院(集团)有限公司电力研究院 A kind of Secondary Circuit of Potential Transformer pressure drop wireless detection device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08264602A (en) * 1995-03-22 1996-10-11 Hitachi Ltd Lsi voltage measuring method
CN201434887Y (en) * 2009-05-27 2010-03-31 安徽省电力公司阜阳供电公司 On-line monitoring unit for secondary loop voltage drop
CN202502134U (en) * 2012-03-27 2012-10-24 上海市电力公司 Secondary voltage drop detection device for voltage transformer
CN204065388U (en) * 2014-03-28 2014-12-31 云南电力试验研究院(集团)有限公司电力研究院 A kind of Secondary Circuit of Potential Transformer pressure drop wireless detection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110133562A (en) * 2019-04-03 2019-08-16 华电电力科学研究院有限公司 A kind of Secondary Circuit of Potential Transformer pressure drop on-site test system and method

Similar Documents

Publication Publication Date Title
Von Meier et al. Precision micro-synchrophasors for distribution systems: A summary of applications
CA2913208C (en) Method and apparatus for monitoring power grid parameters
CA2587073C (en) An electrical instrument platform for mounting on and removal from an energized high voltage power conductor
CN102308225B (en) Power metering and merging unit capabilities in a single IED
US9018938B2 (en) Integrated device suspended at high voltage potential for power energy metering and protection of distribution network
US9081043B2 (en) System and method for calculating power using contactless voltage waveform shape sensor
CN101865986B (en) System and method for checking error of high-voltage electric energy measurement device
Atalik et al. Multipurpose platform for power system monitoring and analysis with sample grid applications
KR101171027B1 (en) An on-line monitoring system for power facilities and its method using circuit parameter measuring
CN201373895Y (en) Online monitoring device of zinc oxide arrester (MOA)
CN101710158B (en) Substation automation system (SAS) with insulation on-line monitoring function for high voltage electric power equipment
CN205067716U (en) Online calibration system of electric energy meter
CN103885438B (en) The Auto-Test System of a kind of transformer station measuring and controlling equipment and method
CN101699301B (en) Method for measuring line parameter through induced electricity
Huang et al. Performance evaluation of phasor measurement systems
CN105445691B (en) A kind of power information collecting device synthetic fault diagnosis system
CN101581752B (en) Power transmission line parameter online measurement method based on fault wave recording
CN101498775B (en) Calibration apparatus for gate energy meter of digitized transforming plant
JP3603876B2 (en) Weighing device
CN102128988A (en) Method of measuring earth ground resistance of a pylon using a single clamp
RU2635849C2 (en) Device and method of voltage and power determination of every phase in medium voltage network
CN201438201U (en) Secondary loop circuit voltage drop synchronous detection device for voltage mutual inductor
CN101545961B (en) System and method for polarity testing of electronic transformer
CN103792508B (en) The error testing system of the digitized measurement device and method of testing
CN102540001B (en) Method of checking alternating current loop of a 500kV transformer substation through carrying out simulated through-type three-phase short circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20170818