CN105717402A - Electric energy meter neutral-live wire reverse connection automatic identification circuit and electric energy meter neutral-live wire reverse connection automatic identification method - Google Patents
Electric energy meter neutral-live wire reverse connection automatic identification circuit and electric energy meter neutral-live wire reverse connection automatic identification method Download PDFInfo
- Publication number
- CN105717402A CN105717402A CN201410719925.1A CN201410719925A CN105717402A CN 105717402 A CN105717402 A CN 105717402A CN 201410719925 A CN201410719925 A CN 201410719925A CN 105717402 A CN105717402 A CN 105717402A
- Authority
- CN
- China
- Prior art keywords
- energy meter
- phase
- electric energy
- zero passage
- detection signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
An electric energy meter neutral-live wire reverse connection automatic identification circuit and an electric energy meter neutral-live wire reverse connection automatic identification method belong to the field of low-voltage power line carrier communication and control, and especially relate to an electric energy meter neutral-live wire reverse connection automatic identification circuit and an electric energy meter neutral-live wire reverse connection automatic identification method. The invention provides an electric energy meter neutral-live wire reverse connection automatic identification circuit and an electric energy meter neutral-live wire reverse connection automatic identification method, which are of high thermal efficiency, and are energy-saving and environment-friendly. The circuit comprises a low-voltage power grid transformer, a carrier concentrator, a first intelligent electric energy meter, a second intelligent electric energy meter and a third intelligent electric energy meter, and is structurally characterized in that the phase-A end of the carrier concentrator is connected with the phase-A outlet end of the low-voltage power grid transformer, the phase-B end of the carrier concentrator is connected with the phase-B outlet end of the low-voltage power grid transformer, the phase-C end of the carrier concentrator is connected with the phase-C outlet end of the low-voltage power grid transformer, and the phase-N end of the carrier concentrator is connected with the phase-N outlet end of the low-voltage power grid transformer; and the phase-A end of the first intelligent electric energy meter is connected with the phase A of a power supply line, and the phase-B end of the second intelligent electric energy meter is connected with the phase B of the power supply line.
Description
Technical field
The invention belongs to low-voltage powerline carrier communication and control field, particularly relate to a kind of electric energy meter zero live wire reversal connection automatic identification circuit and recognition methods.
Background technology
The problems such as in power system, it is common to there is zero live wire and connect instead, imbalance installed by Three-Phase Transformer line table meter, Controlling line loss difficulty.Before acquisition system reaches the standard grade application, these problems are required for power system personnel on site and utilize specific purpose tool to judge, efficiency is non-normally low.
2009 so far, and State Grid Corporation of China and Southern Power Grid Company have carried out the intelligent grid construction project of global maximum-norm, and substantial amounts of intelligent electric meter comes into operation.In the automatic data logging of intelligent meter meter, voltage power-line carrier communication technology is widely applied, and in electricity consumption automatically collection, achieves the achievement of excellence.The thing followed is based on the strengthened research of acquisition system.The field of acquisition system strengthened research is concentrated mainly on line loss analyzing, zero live wire connects instead, abnormal electrical power supply detection, three-phase equilibrium etc..
Alternating current direction vector characteristic refers to A, B, C triple line in the three-phase alternating current of cycle 50Hz, and between each phase line, vector differs 120 °.
Summary of the invention
The present invention is aiming at the problems referred to above, it is provided that a kind of thermal efficiency is high, the electric energy meter zero live wire reversal connection automatic identification circuit of energy-conserving and environment-protective and recognition methods.
For achieving the above object, the present invention adopts the following technical scheme that, the present invention includes low voltage electric network transformator, carrier wave concentrator, the first intelligent electric energy meter, the second intelligent electric energy meter and the 3rd intelligent electric energy meter, its structural feature carrier wave concentrator A phase holds the A phase leading-out terminal with low voltage electric network transformator to be connected, carrier wave concentrator B phase holds the B phase leading-out terminal with low voltage electric network transformator to be connected, carrier wave concentrator C phase holds the C phase leading-out terminal with low voltage electric network transformator to be connected, and carrier wave concentrator N phase holds the N phase leading-out terminal with low voltage electric network transformator to be connected；The A phase of the first intelligent electric energy meter is held and is connected with supply lines A phase, the B phase of the second intelligent electric energy meter is held and is connected with supply lines B phase, the C phase of the 3rd intelligent electric energy meter is held and is connected with supply lines C phase, and the N phase of the first intelligent electric energy meter is held, the N phase of the second intelligent electric energy meter is held, the N phase of the 3rd intelligent electric energy meter is held and is all connected with supply lines N phase；The carrier chip of described first intelligent electric energy meter, the second intelligent electric energy meter and the 3rd intelligent electric energy meter is provided with zero cross detection circuit.
As a kind of preferred version, zero cross detection circuit of the present invention includes resistance R37, resistance R37 one end is connected with live wire, resistance R37 other end side passes sequentially through resistance R38, resistance R39, resistance R40, resistance R41 respectively with diode VD4 negative electrode, MMBTA14L audion VT3 base stage is connected, VD4 anode respectively with zero line, VT3 emitter stage, electric capacity C30 one end, electric capacity C31 one end, stabilivolt anode is connected, the C30 other end, the C31 other end, resistance R42 one end, resistance R49 one end, carrier signal input port VP is connected, the R42 other end, the R49 other end, stabilivolt negative electrode, resistance R43 one end is connected, the R43 other end is connected with optocoupler light emitting diode positive pole, optocoupler light emitting diode negative pole is connected with VT3 colelctor electrode, optocoupler receiving terminal colelctor electrode respectively with resistance R44 one end, electric capacity C32 one end, zero passage detection signal output port TZA is connected, optocoupler receiving terminal emitter stage respectively with the C32 other end, ground wire is connected.
As another kind of preferred version, carrier chip of the present invention adopts TCC081C chip.
Secondly, carrier wave concentrator of the present invention adopts DJGZ23-DXC concentrator.
It addition, intelligent electric energy meter of the present invention adopts DDZY33-Z intelligent electric energy meter.
Electric energy meter zero live wire reversal connection of the present invention automatically identifies and comprises the following steps.
1) carrier wave concentrator all sends detection signal on A, B, C three-phase, make detection signal on electric lines of force before zero passage after (voltage rising) and zero passage (voltage rising) be modulated, send positive zero passage detection signal；Make detection signal on electric lines of force before zero passage after (voltage decline) and zero passage (voltage decline) be modulated, send negative zero passage detection；First concentrator sends positive zero passage detection signal all the time and modulation carries out communication to electric lines of force.
2) intelligent electric energy meter is connected in any phase of A, B, C modulation to be demodulated to the zero passage detection signal on electric lines of force by carrier chip, if the zero passage detection signal after demodulation is positive zero passage detection signal, consistent with the zero cross signal phase place that concentrator sends, then judge that ammeter wiring is correct；If the zero passage detection signal after demodulation is negative zero passage detection signal, with the zero cross signal phase 180 degree that concentrator sends, then ammeter wiring error.
As another kind of preferred version, of the present invention 1) carrier wave concentrator all sends detection signal on A, B, C three-phase, make detection signal on electric lines of force before zero passage after (voltage rising) 1.65ms and zero passage (voltage rising) 1.65ms be modulated, send positive zero passage detection signal；Make detection signal on electric lines of force before zero passage after (voltage decline) 1.65ms and zero passage (voltage decline) 1.65ms be modulated, send negative zero passage detection.
Beneficial effect of the present invention.
The present invention, by power line carrier communication, develops a kind of intelligent electric energy meter zero live wire and connects anti-automatic identification technology.This technology, according to alternating current direction vector characteristic, utilizes mathematical algorithm to realize the electric main direction vector of intelligent electric meter wiring, automatic decision wiring correctness, and then carries out three-phase equilibrium calculating and damage drops in platform district, provides technological means for acquisition system strengthened research.
The technology of the present invention not only realizes the identification of test point Live line Zero line reversal connection, the phase place ownership of intelligent electric meter can also be realized, realize three-phase coulomb balance for power supply enterprise and manage means of providing convenience, the confession electrical connection of working vessels can be found in time simultaneously, avoid personal injury and device damage, reduce the economic loss of Electricity customers and power supply enterprise.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.Scope is not only limited to the statement of herein below.
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is zero cross detection circuit circuit theory diagrams of the present invention.
Fig. 3 is that ammeter zero live wire of the present invention connects anti-decision flow chart.
Fig. 4 is the zero passage tdm communication mode schematic diagram of the present invention.
Fig. 5 be the present invention bore zero phase difference schematic diagram.
Fig. 6 is the zero phase difference schematic diagram just excessively of the present invention.
Detailed description of the invention
As shown in the figure, the present invention includes low voltage electric network transformator, carrier wave concentrator, the first intelligent electric energy meter, the second intelligent electric energy meter and the 3rd intelligent electric energy meter, its structural feature carrier wave concentrator A phase holds the A phase leading-out terminal with low voltage electric network transformator to be connected, carrier wave concentrator B phase holds the B phase leading-out terminal with low voltage electric network transformator to be connected, carrier wave concentrator C phase holds the C phase leading-out terminal with low voltage electric network transformator to be connected, and carrier wave concentrator N phase holds the N phase leading-out terminal with low voltage electric network transformator to be connected；The A phase of the first intelligent electric energy meter is held and is connected with supply lines A phase, the B phase of the second intelligent electric energy meter is held and is connected with supply lines B phase, the C phase of the 3rd intelligent electric energy meter is held and is connected with supply lines C phase, and the N phase of the first intelligent electric energy meter is held, the N phase of the second intelligent electric energy meter is held, the N phase of the 3rd intelligent electric energy meter is held and is all connected with supply lines N phase；The carrier chip of described first intelligent electric energy meter, the second intelligent electric energy meter and the 3rd intelligent electric energy meter is provided with zero cross detection circuit.
Described zero cross detection circuit includes resistance R37, resistance R37 one end is connected with live wire, resistance R37 other end side passes sequentially through resistance R38, resistance R39, resistance R40, resistance R41 respectively with diode VD4 negative electrode, MMBTA14L audion VT3 base stage is connected, VD4 anode respectively with zero line, VT3 emitter stage, electric capacity C30 one end, electric capacity C31 one end, stabilivolt anode is connected, the C30 other end, the C31 other end, resistance R42 one end, resistance R49 one end, carrier signal input port VP is connected, the R42 other end, the R49 other end, stabilivolt negative electrode, resistance R43 one end is connected, the R43 other end is connected with optocoupler light emitting diode positive pole, optocoupler light emitting diode negative pole is connected with VT3 colelctor electrode, optocoupler receiving terminal colelctor electrode respectively with resistance R44 one end, electric capacity C32 one end, zero passage detection signal output port TZA is connected, optocoupler receiving terminal emitter stage respectively with the C32 other end, ground wire is connected.
Described carrier chip adopts TCC081C chip.
Described carrier wave concentrator adopts DJGZ23-DXC concentrator.
Described intelligent electric energy meter adopts DDZY33-Z intelligent electric energy meter.
Electric energy meter zero live wire reversal connection of the present invention automatically identifies and comprises the following steps.
1) carrier wave concentrator all sends detection signal on A, B, C three-phase, make detection signal on electric lines of force before zero passage after (voltage rising) and zero passage (voltage rising) be modulated, send positive zero passage detection signal；Make detection signal on electric lines of force before zero passage after (voltage decline) and zero passage (voltage decline) be modulated, send negative zero passage detection；First concentrator sends positive zero passage detection signal all the time and modulation carries out communication to electric lines of force.
2) intelligent electric energy meter is connected in any phase of A, B, C modulation to be demodulated to the zero passage detection signal on electric lines of force by carrier chip, if the zero passage detection signal after demodulation is positive zero passage detection signal, consistent with the zero cross signal phase place that concentrator sends, then judge that ammeter wiring is correct；If the zero passage detection signal after demodulation is negative zero passage detection signal, with the zero cross signal phase 180 degree that concentrator sends, then ammeter wiring error.
Described 1) carrier wave concentrator all sends detection signal on A, B, C three-phase, make detection signal on electric lines of force before zero passage after (voltage rising) 1.65ms and zero passage (voltage rising) 1.65ms be modulated, send positive zero passage detection signal；Make detection signal on electric lines of force before zero passage after (voltage decline) 1.65ms and zero passage (voltage decline) 1.65ms be modulated, send negative zero passage detection.
It is understandable that, above with respect to the specific descriptions of the present invention, it is merely to illustrate the present invention and is not limited to the technical scheme described by the embodiment of the present invention, it will be understood by those within the art that, still the present invention can be modified or equivalent replacement, to reach identical technique effect；Needs are used, all within protection scope of the present invention as long as meeting.
Claims (7)
1.Electric energy meter zero live wire reversal connection automatic identification circuit, including low voltage electric network transformator, carrier wave concentrator, the first intelligent electric energy meter, the second intelligent electric energy meter and the 3rd intelligent electric energy meter, it is characterized in that carrier wave concentrator A phase holds the A phase leading-out terminal with low voltage electric network transformator to be connected, carrier wave concentrator B phase holds the B phase leading-out terminal with low voltage electric network transformator to be connected, carrier wave concentrator C phase holds the C phase leading-out terminal with low voltage electric network transformator to be connected, and carrier wave concentrator N phase holds the N phase leading-out terminal with low voltage electric network transformator to be connected；The A phase of the first intelligent electric energy meter is held and is connected with supply lines A phase, the B phase of the second intelligent electric energy meter is held and is connected with supply lines B phase, the C phase of the 3rd intelligent electric energy meter is held and is connected with supply lines C phase, and the N phase of the first intelligent electric energy meter is held, the N phase of the second intelligent electric energy meter is held, the N phase of the 3rd intelligent electric energy meter is held and is all connected with supply lines N phase；The carrier chip of described first intelligent electric energy meter, the second intelligent electric energy meter and the 3rd intelligent electric energy meter is provided with zero cross detection circuit.
2.Electric energy meter zero live wire reversal connection automatic identification circuit and recognition methods according to claim 1, it is characterised in that described zero cross detection circuit includes resistance R37, resistance R37 one end and is connected with live wire, and resistance R37 other end side passes sequentially through resistance R38, resistance R39, resistance R40, resistance R41 respectively with diode VD4 negative electrode, MMBTA14L audion VT3 base stage be connected, VD4 anode respectively with zero line, VT3 emitter stage, electric capacity C30 one end, electric capacity C31 one end, stabilivolt anode is connected, the C30 other end, the C31 other end, resistance R42 one end, resistance R49 one end, carrier signal input port VP is connected, the R42 other end, the R49 other end, stabilivolt negative electrode, resistance R43 one end be connected, the R43 other end is connected with optocoupler light emitting diode positive pole, and optocoupler light emitting diode negative pole is connected with VT3 colelctor electrode, optocoupler receiving terminal colelctor electrode respectively with resistance R44 one end, electric capacity C32 one end, zero passage detection signal output port TZA be connected, optocoupler receiving terminal emitter stage respectively with the C32 other end, ground wire is connected.
3.Electric energy meter zero live wire reversal connection automatic identification circuit and recognition methods according to claim 2, it is characterised in that described carrier chip adopts TCC081C chip.
4.Electric energy meter zero live wire reversal connection automatic identification circuit and recognition methods according to claim 3, it is characterised in that described carrier wave concentrator adopts DJGZ23-DXC concentrator.
5.Electric energy meter zero live wire reversal connection automatic identification circuit and recognition methods according to claim 4, it is characterised in that described intelligent electric energy meter adopts DDZY33-Z intelligent electric energy meter.
6.Electric energy meter zero live wire reversal connection automatic identifying method, it is characterised in that comprise the following steps:
1) carrier wave concentrator all sends detection signal on A, B, C three-phase, make detection signal on electric lines of force before zero passage after (voltage rising) and zero passage (voltage rising) be modulated, send positive zero passage detection signal；Make detection signal on electric lines of force before zero passage after (voltage decline) and zero passage (voltage decline) be modulated, send negative zero passage detection；First concentrator sends positive zero passage detection signal all the time and modulation carries out communication to electric lines of force；
2) intelligent electric energy meter is connected in any phase of A, B, C modulation to be demodulated to the zero passage detection signal on electric lines of force by carrier chip, if the zero passage detection signal after demodulation is positive zero passage detection signal, consistent with the zero cross signal phase place that concentrator sends, then judge that ammeter wiring is correct；If the zero passage detection signal after demodulation is negative zero passage detection signal, with the zero cross signal phase 180 degree that concentrator sends, then ammeter wiring error.
7.According to claim 6, electric energy meter zero live wire reversal connection automatic identifying method is characterized in that described 1) carrier wave concentrator all sends detection signal on A, B, C three-phase, make detection signal on electric lines of force before zero passage after (voltage rising) 1.65ms and zero passage (voltage rising) 1.65ms be modulated, send positive zero passage detection signal；Make detection signal on electric lines of force before zero passage after (voltage decline) 1.65ms and zero passage (voltage decline) 1.65ms be modulated, send negative zero passage detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410719925.1A CN105717402B (en) | 2014-12-03 | 2014-12-03 | Zero firewire reversal connection automatic identification circuit of electric energy meter and recognition methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410719925.1A CN105717402B (en) | 2014-12-03 | 2014-12-03 | Zero firewire reversal connection automatic identification circuit of electric energy meter and recognition methods |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105717402A true CN105717402A (en) | 2016-06-29 |
| CN105717402B CN105717402B (en) | 2018-10-09 |
Family
ID=56146211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410719925.1A Active CN105717402B (en) | 2014-12-03 | 2014-12-03 | Zero firewire reversal connection automatic identification circuit of electric energy meter and recognition methods |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105717402B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093693A (en) * | 2016-06-08 | 2016-11-09 | 成都博高信息技术股份有限公司 | The Wiring detection method of a kind of power line and system |
| CN107422221A (en) * | 2017-09-04 | 2017-12-01 | 云南电网有限责任公司电力科学研究院 | On-line testing three-phase APF and primary current mutual inductor interstar connection a kind of method |
| CN108233528A (en) * | 2016-12-14 | 2018-06-29 | 华为技术有限公司 | A kind of power input control device |
| CN109164345A (en) * | 2018-09-27 | 2019-01-08 | 深圳友讯达科技股份有限公司 | Live line Zero line Wiring detection method, device and intelligent electric meter |
| CN109613386A (en) * | 2019-01-04 | 2019-04-12 | 常熟开关制造有限公司(原常熟开关厂） | The detection method and device of three phase mains inlet wire zero curve misconnection, automatic change-over |
| CN110221161A (en) * | 2019-07-25 | 2019-09-10 | 云南电网有限责任公司电力科学研究院 | A kind of family of offset voltage, change, phase relation determine method and device |
| CN110244172A (en) * | 2018-12-28 | 2019-09-17 | 国网浙江长兴县供电有限公司 | A kind of zero firewire detection system of family table inlet wire and method |
| CN111123761A (en) * | 2019-11-26 | 2020-05-08 | 国网浙江省电力有限公司湖州供电公司 | Intelligent recognition device and recognition method for zero and live lines |
| CN111929634A (en) * | 2020-09-02 | 2020-11-13 | 华立科技股份有限公司 | N-line-based signal injection topology recognition device and method |
| WO2023065452A1 (en) * | 2021-10-18 | 2023-04-27 | 河南许继仪表有限公司 | Direct-current metering voltage sampling device for electric energy meter |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3914687A (en) * | 1974-04-29 | 1975-10-21 | Bevins M W Co Inc | Continuity testing device for a high voltage measurement device |
| CN2914101Y (en) * | 2005-12-13 | 2007-06-20 | 北京潞电电气设备厂 | Connection discriminating device |
| CN102072999B (en) * | 2009-11-25 | 2014-01-15 | 江苏省电力公司南京供电公司 | Connection testing device of electric energy metering device and using method thereof |
| CN201623706U (en) * | 2010-02-08 | 2010-11-03 | 长沙威胜信息技术有限公司 | Low-voltage power line carrier communication module |
| CN201812016U (en) * | 2010-09-26 | 2011-04-27 | 河南省电力公司焦作供电公司 | Pre-buried low-voltage cable detecting device with long-range control function |
| CN201955421U (en) * | 2011-01-20 | 2011-08-31 | 安徽省电力公司蚌埠供电公司 | Wiring detector for multifunctional electric energy metering device |
| CN202393858U (en) * | 2011-12-19 | 2012-08-22 | 上海安科瑞电气股份有限公司 | Correcting unit for reverse connection of current wires of field electric meter |
| CN103869210B (en) * | 2014-03-21 | 2017-05-10 | 国家电网公司 | Wiring right and wrong detector for electric energy metering device in power-off state |
| CN203773002U (en) * | 2014-03-21 | 2014-08-13 | 国家电网公司 | Wire connection correctness detector for electric energy metering device |
-
2014
- 2014-12-03 CN CN201410719925.1A patent/CN105717402B/en active Active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093693A (en) * | 2016-06-08 | 2016-11-09 | 成都博高信息技术股份有限公司 | The Wiring detection method of a kind of power line and system |
| CN106093693B (en) * | 2016-06-08 | 2019-10-18 | 成都博高信息技术股份有限公司 | A kind of Wiring detection method and system of power line |
| CN108233528A (en) * | 2016-12-14 | 2018-06-29 | 华为技术有限公司 | A kind of power input control device |
| CN108233528B (en) * | 2016-12-14 | 2021-10-01 | 华为技术有限公司 | Power input control device |
| CN107422221A (en) * | 2017-09-04 | 2017-12-01 | 云南电网有限责任公司电力科学研究院 | On-line testing three-phase APF and primary current mutual inductor interstar connection a kind of method |
| CN109164345A (en) * | 2018-09-27 | 2019-01-08 | 深圳友讯达科技股份有限公司 | Live line Zero line Wiring detection method, device and intelligent electric meter |
| CN110244172A (en) * | 2018-12-28 | 2019-09-17 | 国网浙江长兴县供电有限公司 | A kind of zero firewire detection system of family table inlet wire and method |
| CN109613386B (en) * | 2019-01-04 | 2020-10-02 | 常熟开关制造有限公司(原常熟开关厂） | Method and device for detecting misconnection of zero lines of three-phase power supply incoming line and automatic change-over switch |
| CN109613386A (en) * | 2019-01-04 | 2019-04-12 | 常熟开关制造有限公司(原常熟开关厂） | The detection method and device of three phase mains inlet wire zero curve misconnection, automatic change-over |
| CN110221161A (en) * | 2019-07-25 | 2019-09-10 | 云南电网有限责任公司电力科学研究院 | A kind of family of offset voltage, change, phase relation determine method and device |
| CN110221161B (en) * | 2019-07-25 | 2021-03-30 | 云南电网有限责任公司电力科学研究院 | Method and device for determining household, transformer and phase relation of compensation voltage |
| CN111123761A (en) * | 2019-11-26 | 2020-05-08 | 国网浙江省电力有限公司湖州供电公司 | Intelligent recognition device and recognition method for zero and live lines |
| CN111929634A (en) * | 2020-09-02 | 2020-11-13 | 华立科技股份有限公司 | N-line-based signal injection topology recognition device and method |
| WO2023065452A1 (en) * | 2021-10-18 | 2023-04-27 | 河南许继仪表有限公司 | Direct-current metering voltage sampling device for electric energy meter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105717402B (en) | 2018-10-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105717402A (en) | Electric energy meter neutral-live wire reverse connection automatic identification circuit and electric energy meter neutral-live wire reverse connection automatic identification method | |
| CN102185543B (en) | Energy-saving soft-start device for high-voltage asynchronous motor | |
| CN105548755B (en) | The method for detecting inverter AC and DC side ground connection by single ground insulation impedance detection network | |
| CN103698643A (en) | Low-voltage power distribution area identification method and power distribution area instrument | |
| CN107748292A (en) | One kind exchange insulation detecting circuit, system and method | |
| CN104034981A (en) | Self-circulation aging test system and test method for frequency converter | |
| CN103543378B (en) | Platform sheet relation detection method | |
| CN109212334A (en) | Electric energy meter phase sequence identifies device and method | |
| CN101833055B (en) | Method and system for testing low pressure increase of converter valve equipment | |
| CN103869161A (en) | Power line phase detection device and method | |
| CN102830266A (en) | Phase discriminating circuit of residual current phase | |
| CN103248134B (en) | Electric energy extracting device for cable partial discharge on-line detection | |
| CN204389672U (en) | Intelligent electric meter serial ports DL/T645 communication protocol on-line quick detection device | |
| CN201955399U (en) | Three-phase-current phase-lacking detection circuit | |
| CN205027868U (en) | Ultralow frequency cable pressure resistance test installation | |
| CN104655989A (en) | Smart meter collecting function based remote inspection method for power outage fields | |
| CN204855631U (en) | Alternating current virtual value detection circuitry | |
| CN104237636A (en) | AC commercial power vector direction identifying technique | |
| CN204559632U (en) | Platform district electricity consumption user recognition system | |
| CN204009049U (en) | A kind of test fixture for concentrator and electric energy meter communication function | |
| CN102288818A (en) | Split type measurement method and split type power distribution terminal | |
| CN201765270U (en) | Zero-crossing detection circuit of electric meter system | |
| CN201177647Y (en) | Multiple waveform aging test apparatus of lightning arrester | |
| CN109164307B (en) | Phase sequence identification algorithm for distribution transformer | |
| CN204168235U (en) | With the concentrated inversion pressure swing type photovoltaic generation monitoring the complete sets of equipment of power detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |