CN102709044B - A kind of integrated electric formula transformer device - Google Patents
A kind of integrated electric formula transformer device Download PDFInfo
- Publication number
- CN102709044B CN102709044B CN201210167845.0A CN201210167845A CN102709044B CN 102709044 B CN102709044 B CN 102709044B CN 201210167845 A CN201210167845 A CN 201210167845A CN 102709044 B CN102709044 B CN 102709044B
- Authority
- CN
- China
- Prior art keywords
- phase
- voltage
- voltage divider
- current
- 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.)
- Expired - Fee Related
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides a kind of integrated electric formula transformer device, comprise current signal collecting part, voltage signal acquisition part, signal processing unit, working power, in 3-35kV three-phase alternating current, determine that is specified a phase, other two-phase is non-designated phase; Signal processing unit, working power are directly integrated in the hot end of specifying phase; Current signal collection comprises three-phase current sensor, and the primary side of three-phase current sensor is serially connected in three-phase high-voltage current circuit respectively, and the secondary coil of three-phase current sensor is connected to the signal processing unit that appointment is gone up mutually; Voltage signal acquisition part to comprise between first-phase voltage divider U2 between voltage divider U1 and second-phase, between first-phase, between voltage divider U1 and second-phase, voltage divider U2 is connected between two non-designated phases with appointment mutually, between first-phase, voltage divider U1 is connected with appointment mutually with the low-voltage arm of voltage divider U2 between second-phase, high-voltage arm is connected with non-designated, and voltage division signal is linked into the signal processing unit that appointment is gone up mutually.
Description
Technical field
The present invention relates to a kind of integrated electric formula transformer device, belong to electronic mutual inductor technical field, be a kind of same for data combination unit electric current, voltage signal acquisition converting unit, communication unit, working power, stand-by power supply all centralized arrangement to specify the device of the hot end of phase at one of Integral electronic instrument transformer, its secondary exports the digital signal for meeting IEC61850 stipulations.
Background technology
At present conventional in engineering have a variety of to the method that voltage and current signal carries out digitlization conversion.Main has following three types:
The first, with electromagnetic current transducer independently traditional separately, voltage transformer, high voltage, big current reduction are become general low-voltage, small area analysis (such as: rated current 5 is pacified or 1A, rated voltage 100 volts), then with the chromacoder being arranged on low-pressure end, the analog signal of low-voltage and small area analysis is converted to corresponding digital signal.The advantage of this technology is: it is a kind of technology of maturation, constant product quality.Its shortcoming mainly contains: electromagnetic current transducer and voltage transformer exist volume large, take up room large, the problem of the metal material of consume material, particularly at substantial, does not meet current international and domestic energy-saving and cost-reducing requirement.The second, signal pickup assembly is arranged on electronegative potential, because secondary connection is long, makes interference signal very large on the impact of the little analog signals of secondary current, secondary voltage, easily introduces interference, make protective relaying maloperation and affect certainty of measurement.3rd, electromagnetic potential transformer may produce ferro resonance under some operational mode, thus brings out electric power system major accident.4th, owing to usually using silicon steel sheet as iron core, can there is magnetic saturation when fault current is very large, make protective relaying device tripping in electromagnetic current transducer.5th, electromagnetic current transducer, insulation structure for voltage mutual inductor are complicated, and its cost is with the raising exponentially relation rising of electric pressure.In order to overcome above-mentioned shortcoming, the electronic mutual inductor new technology starting in recent years to promote the use of can solve the problem preferably.
The second; the potential and current transformers exported with unconventional small-signal (is defined as a type of electronic mutual inductor by International Power tissue; it exports the little analog signals for tens of milliamperes electric current and three ten-day period of hot season voltage) substitute traditional electrical magnetic-type instrument transformer, for the protective relaying device installed or chromacoder nearby.The feature of this class technology is, signals collecting conversion, data processing (merging packing) all complete in low-pressure side with communicating.Its advantage is that electric current, voltage transformer are miniaturized, volume is reduced and material saving.Simultaneously because its output valve is very little, what make signals collecting converting unit thereafter can directly use its output valve, and need not carry out two times transfer to analog quantity, simplifies signals collecting converting unit structure.Its shortcoming is, this switch technology is similar to traditional know-why in itself, the progress of technology not essence.Secondly, the analog quantity exported due to its secondary is very little, is more easily interfered, and can only change on the spot and use, limit the scope of application.
The third, be together placed in hot end by the signals collecting converting unit be made up of modulus conversion chip and computer chip and unconventional electric current and/or voltage sensor.Single-phase voltage and/or current signal is obtained in high-pressure side; the digital data transmission of the voltage and current that high-pressure side Collect conversion obtains respectively by the good optical fiber of insulation property by A, B, C three-phase is to the merge cells of low-pressure side, and each phase signals received is sent to data transmission network or measuring instrument, control device and protective relaying device by the packing of IEC 61850 stipulations by merge cells.This is typical electronic type voltage transformer or electronic current mutual inductor.The main feature of this technology is: the first, the insulation system of electronic type voltage transformer or electronic current mutual inductor simplifies greatly, and volume is little, lightweight, and electric pressure its superiority of effectiveness higher is more obvious.The second, the Collect conversion of voltage and current signal, data processing all complete in high-pressure side with communicating.Use optical cable instead of cable as Signal transmissions instrument, achieve the thorough isolation of high-low pressure, there is not electromagnetic potential transformer secondary loop short circuit or electromagnetic current transducer secondary circuit to open a way the harm caused to equipment and the person, safety and reliability improves greatly.Three, unconventional mutual inductor is essentially different with traditional instrument transformer in principle, generally closes without silicon sheet core be Ci Said.Because this eliminating magnetic saturation and ferro resonance phenomenon, thus the transient response that instrument transformer is run is good, and dynamic range is large, and certainty of measurement is high, and frequency response range is wide.Four, export employing optical fiber, transfer of data antijamming capability is strong.Do not have conventional copper core secondary wiring, it can make the material saving that particularly metal material is a large amount of.Five, this technology can make transducer and acquisition process unit merge completely, is easy to carry out global error verification.Its shortcoming is: the signal of first and third phase voltage and three-phase current is carried out separately by the signals collecting converting unit respectively at A, B, C three-phase, higher to the requirement of signal synchronous collection.The second, after conversion, three-phase voltage and current digital signal will be sent to the merge cells of assigned address respectively with optical fiber, carry out data to pack backward network transmission, this can cause the increase of alternate optical-fiber communication channel, make the complex structure of communication unit and merge cells, increase a lot of electric light/photoelectric conversion interface, power consumption increases, and it is larger that technology realizes difficulty.Three, except increasing manufacturing cost, this structure also can increase the fault rate of device for collecting high-voltage signals.This is a kind of new technology universal gradually in recent years, and especially in 110kV and above, economic technique superiority is obvious.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, a kind of 3-35kV integrated electric formula transformer device is provided, by current signal collecting part, voltage signal acquisition part is directly sent to the hot end of a certain phase of Integral electronic instrument transformer, at this hot end, signal is converted to corresponding digital signal, carry out merging to the digital signal after conversion by the stipulations requirement of IEC 61850 by merge cells to pack, by optical fiber or other medium, signal bag is sent to the measuring instrument of low-pressure end (or other high-pressure side) by communication unit, instrument, relaying protection, control device or data transmission network.
Technical scheme of the present invention: a kind of integrated electric formula transformer device of the present invention comprises current signal collecting part, voltage signal acquisition part, signal processing unit, working power, in 3-35kV three-phase alternating current, determine that is specified a phase, other two-phase is non-designated phase; Signal processing unit, working power are directly integrated in the high-voltage end of specifying phase; Current signal collecting part comprises three-phase current sensor La, Lb, Lc, the primary side of three-phase current sensor La, Lb, Lc is serially connected in three-phase high-voltage current circuit respectively, and the secondary coil of three-phase current sensor is connected to the signal processing unit that appointment is gone up mutually; Voltage signal acquisition part to comprise between first-phase voltage divider U2 between voltage divider U1 and second-phase, between first-phase, between voltage divider U1 and second-phase, voltage divider U2 is connected between two non-designated phases with appointment mutually, between first-phase, voltage divider U1 is connected with appointment mutually with the low-voltage arm of voltage divider U2 between second-phase, high-voltage arm is connected with non-designated, and voltage division signal is linked into the signal processing unit that appointment is gone up mutually.
Described alternate voltage divider uses non-ferric magnetic-type transducer, as capacitor voltage divider or resitstance voltage divider or RC divider.
Described integrated electric formula transformer device, every phase current transducer has one or two secondary current coil, uses non-ferromagnetic type coil, as Luo-coil and low power consumption current instrument transformer (LPCT); Specify first and second side of current sensor of going up mutually to be in same current potential, the non-designated current sensor gone up mutually first and second between insulation isolation, withstand voltage level is according to voltage between phases level design.
The work energy of described signal processing unit can supply by voltage divider by getting, get and can comprise voltage divider U3 and the 4th alternate voltage divider U4 between third phase by voltage divider, between third phase, point pressure arm of voltage divider U3 and the 4th alternate voltage divider U4 is all connected to the input of working power, gets and can be connected between two non-designated phases with appointment mutually by voltage divider.
Described signal processing unit comprises the signals collecting converting unit, central processing unit, merge cells, the communication unit that connect successively, signal processing unit is operated in the high potential point of specifying phase, to specify phase high potential for benchmark, synchronous acquisition is carried out to electric current and voltage signal, be converted to digital signal, and the stipulations of digital signal according to IEC 61850 are packed, use optical fiber or other medium to send by communication unit.
Described integrated electric formula transformer device, is provided with lithium battery and/or ultracapacitor as stand-by power supply specifying the high potential point of phase.
Described integrated electric formula transformer device, carries out electromagnetic shielding by signal processing unit, working power, stand-by power supply can.
Described integrated electric formula transformer device, insulating material current signal collecting part, voltage signal acquisition part, signal processing unit, working power and connection wire thereof is utilized to be encapsulated in one, thus the electronic mutual inductor apparatus that formation one is integrated.
Described integrated electric formula transformer device, by current signal collecting part, voltage signal acquisition part, get and can voltage divider, signal processing unit, working power and connection wire thereof utilize insulating material to be encapsulated in one, thus the electronic mutual inductor apparatus that formation one is integrated.
Described integrated electric formula transformer device, just signal processing unit, working power, stand-by power supply can carry out electromagnetic shielding, by current signal collecting part, voltage signal acquisition part, get and can voltage divider, metal shielding box and connection wire thereof utilize insulating material to be encapsulated in one, thus the electronic mutual inductor apparatus that formation one is integrated.
Advantage of the present invention: the present invention has following innovative point compared with existing electronic mutual inductor technology:
1, merge cells with signals collecting converting unit, communication unit, working power, stand-by power supply directly integrated one specify phase (such as: B phase) high potential point; The current sensor secondary current of non-designated phase (such as: A phase and C phase) is sent to the high potential of specifying phase (such as: B phase), and this has established technical foundation for the solution of the present invention design.
2, on the high potential of specifying phase, realize the synchronous acquisition to three phase metering current signal, three-phase protective current signal, three voltage between phases signals, be converted to digital signal; and digital signal is carried out merging packing by the requirement of IEC 61850 stipulations, data operative installations or the data transmission network of low-pressure end or other high-pressure side is transferred to by optical fiber (or other medium).
3, the design on hardware and software of signal processing unit (comprising signals collecting converting unit, central processing unit, merge cells and communication unit) is simplified.Save many electric light/photoelectric conversion interface circuit, make the structure of electronic circuit simpler, power consumption is less, runs more stable.
The present invention has following advantage compared with prior art:
1, structure of the present invention is simpler, device volume is less, it is less to take up room.
2, the present invention can be arranged on can not provide on the outdoor shaft tower of low-voltage supply, in ring main unit or van-type transformer, meet the service requirement under specific condition.
3, the present invention saves material, reduces the overall manufacturing cost of electronic mutual inductor.
4, the present invention is more easily by various high-low pressure type approval test.
5, the synchronous error between electric current of the present invention, voltage transformer three-phase current, each signal of voltage is less, and accuracy is higher.
Accompanying drawing explanation
Fig. 1 is the theory diagram of integrated electric formula transformer device of the present invention.
Embodiment
The present invention is set directly at signal processing unit the high-pressure side of an appointment phase of 3-35kV, and its secondary exports the digital signal for meeting IEC 61850 stipulations.Be different from and existing a signals collecting converting unit be respectively set at three-phase, the building method of merge cells is set in low-pressure side.
The present invention includes current signal collecting part, voltage signal acquisition part, signal processing unit, working power, in 3-35kV three-phase alternating current, determine that is specified a phase, other two-phase is non-designated phase; Signal processing unit, working power are directly integrated in the high-voltage end of specifying phase; Current signal collecting part comprises three-phase current sensor La, Lb, Lc, the primary side of three-phase current sensor La, Lb, Lc is serially connected in three-phase high-voltage current circuit respectively, and the secondary coil of three-phase current sensor is connected to the signal processing unit that appointment is gone up mutually; Voltage signal acquisition part to comprise between first-phase voltage divider U2 between voltage divider U1 and second-phase, between first-phase, between voltage divider U1 and second-phase, voltage divider U2 is connected between two non-designated phases with appointment mutually, between first-phase, voltage divider U1 is connected with appointment mutually with the low-voltage arm of voltage divider U2 between second-phase, high-voltage arm is connected with non-designated, and voltage division signal is linked into the signal processing unit that appointment is gone up mutually.
The present invention carries out synchronous acquisition to three phase metering current signal (IA1, I B1, IC1), three-phase protective current signal (IA2, I B2, IC2), three voltage between phases signal (U AB, U BC, U CA) concentrating, is converted to digital signal; and digital signal is carried out merging packing by the requirement of IEC61850 stipulations, data operative installations or the data transmission network of low-pressure end (or other high-pressure side) is transferred to by optical fiber (or other medium).
Current sensor of the present invention uses Luo-coil and low power consumption current instrument transformer (LPCT) to form, first and second electric current of the current sensor Lb of phase (such as: B phase) is specified to be in same current potential, non-designated phase (such as: A phase and C phase) current sensor La, Lc first and second electric current be insulation isolation, the secondary current of current sensor is all connected to the current input terminal of the signals collecting converting unit of specifying phase high potential.
The present invention is specifying phase by voltage divider U2 between alternate voltage divider U1 and second-phase) height point site obtain non-designated phase and voltage between phases signal (such as: U AB, U BC) between specifying mutually.
Signal processing unit of the present invention comprises signals collecting converting unit, central processing unit, merge cells and communication unit, signal processing unit is operated in the hot end of specifying phase (such as: B phase), signals collecting converting unit is to specify the current potential of phase as reference current potential, to six current signals, three voltage signals carry out synchronous acquisition, be converted to corresponding digital signal, through data processing, merge, according to the stipulations of IEC 61850, packing is merged to the digital signal of the electric current after conversion and voltage, communication unit uses optical fiber or small wireless or GPRS or carrier wave or the infrared measuring instrument as communication medium, the signal after packing being sent to low-pressure end (also not discharging other hot end), instrument, relaying protection, control device or data transmission network.
The working power of signal processing unit part of the present invention can supply by voltage divider by getting, get and can comprise voltage divider U3 and the 4th alternate voltage divider U4 between third phase by voltage divider, between third phase, point pressure arm of voltage divider U3 and the 4th alternate voltage divider U4 is all connected to the input of working power, gets and can be connected between two non-designated phases with appointment mutually by voltage divider.Get and can special voltage divider (such as: capacitor voltage divider) be utilized for being in signals collecting converting unit, the central processing unit of specifying phase high potential by voltage divider.Merge cells and communication unit provide work capacity.
The present invention is by signals collecting converting unit, central processor CPU, merge cells, communication unit, power supply, stand-by power supply can carries out electromagnetic shielding, by three-phase current sensor La, Lb, Lc(is containing three phase metering current sensor, three-phase protective current sensor), voltage divider U2 between voltage divider U1 and second-phase between first-phase, between third phase, voltage divider U3 and the 4th alternate voltage divider U4 and metal shielding box and connection wire thereof utilize insulating material to be encapsulated in one, thus form an integrated electric formula transformer device, its secondary exports the digital signal for meeting IEC 61850 stipulations.
As shown in Figure 1, after the hot end of appointment phase (such as: B phase) obtains above-mentioned voltage secondary singal and electric current secondary singal, by signals collecting converting unit to specify the current potential of phase (such as: B phase) as with reference to current potential, concentrate carry out six magnitudes of current, three voltages synchronized sampling, be converted to corresponding digital quantity.The principle of compositionality of signal processing unit is identical with low-pressure end signals collecting conversion equipment with method.The signal processing unit run at high potential is different from the running environment of low-pressure end signal pickup assembly, needs to carry out special electromagnetic shielding design protection to signal processing unit.In addition, the power consumption of signal processing unit also will design be less than the power consumption of traditional low-pressure end signals collecting converting unit.
As shown in Figure 1, be all at signal processing unit of the present invention on the high potential of specifying phase (such as: B phase).So the result of signal processing unit needs to be delivered to by communication channel the device or network that cold end (also not discharging other hot end) specifies, and is supplied to the person of needs of signals collecting transformation result.Optical fiber or small wireless or GPRS or carrier wave can be used or infraredly complete communication as communication medium with specified device or network; the result of the three phase metering electric current collected, three-phase protective electric current, three-phase voltage electric parameters is mail to object, thus completes the communication transmission of collection result from hot end to cold end.
The present invention can be arranged on the indoor or outdoor of 3-35kV transformer and distribution power station or overhead line structures or in ring main unit or van-type transformer.
Claims (9)
1. an integrated electric formula transformer device, comprise current signal collecting part, voltage signal acquisition part, signal processing unit, working power, stand-by power supply, it is characterized in that: in 3-35kV three-phase alternating current, determine that is specified a phase, other two-phase is non-designated phase; Signal processing unit, working power, stand-by power supply are directly integrated in the high-voltage end of specifying phase; Current signal collecting part comprises three-phase current sensor La, Lb, Lc, the primary side of three-phase current sensor La, Lb, Lc is serially connected in three-phase high-voltage current circuit respectively, and the secondary coil of three-phase current sensor is connected to the signal processing unit that appointment is gone up mutually; Voltage signal acquisition part to comprise between first-phase voltage divider U2 between voltage divider U1 and second-phase, between first-phase, between voltage divider U1 and second-phase, voltage divider U2 is connected between two non-designated phases with appointment mutually, between first-phase, voltage divider U1 is connected with appointment mutually with the low-voltage arm of voltage divider U2 between second-phase, high-voltage arm is connected with non-designated, and voltage division signal is linked into the signal processing unit that appointment is gone up mutually; Every phase current transducer has one or two secondary current coil, uses non-ferromagnetic type coil; Specify first and second side of current sensor of going up mutually to be in same current potential, the non-designated current sensor gone up mutually first and second between insulation isolation, withstand voltage level is according to voltage between phases level design.
2. integrated electric formula transformer device according to claim 1, is characterized in that: alternate voltage divider uses non-ferric magnetic-type transducer.
3. integrated electric formula transformer device according to claim 1 and 2, it is characterized in that: the work energy of signal processing unit can supply by voltage divider by getting, get and can comprise voltage divider U3 and the 4th alternate voltage divider U4 between third phase by voltage divider, between third phase, point pressure arm of voltage divider U3 and the 4th alternate voltage divider U4 is all connected to the input of working power, gets and can be connected between two non-designated phases with appointment mutually by voltage divider.
4. integrated electric formula transformer device according to claim 1 and 2, it is characterized in that: signal processing unit comprises the signals collecting converting unit, central processing unit, merge cells, the communication unit that connect successively, signal processing unit is operated in the high potential point of specifying phase, to specify phase high potential for benchmark, synchronous acquisition is carried out to electric current and voltage signal, be converted to digital signal, and the stipulations of digital signal according to IEC 61850 are packed, use optical fiber or other medium to send by communication unit.
5. integrated electric formula transformer device according to claim 1 and 2, is characterized in that: be provided with lithium battery and/or ultracapacitor as stand-by power supply specifying the high potential point of phase.
6. integrated electric formula transformer device according to claim 1 and 2, is characterized in that: signal processing unit, working power, stand-by power supply can are carried out electromagnetic shielding.
7. integrated electric formula transformer device according to claim 1 and 2, it is characterized in that: current signal collecting part, voltage signal acquisition part, signal processing unit, working power, stand-by power supply and connection wire thereof are utilized insulating material to be encapsulated in one, thus the electronic mutual inductor apparatus that formation one is integrated.
8. integrated electric formula transformer device according to claim 3, it is characterized in that: by current signal collecting part, voltage signal acquisition part, get and can voltage divider, signal processing unit, working power, stand-by power supply and connection wire thereof utilize insulating material to be encapsulated in one, thus the electronic mutual inductor apparatus that formation one is integrated.
9. integrated electric formula transformer device according to claim 5, it is characterized in that: signal processing unit, working power, stand-by power supply can are carried out electromagnetic shielding, by current signal collecting part, voltage signal acquisition part, get and can voltage divider, metal shielding box and connection wire thereof utilize insulating material to be encapsulated in one, thus the electronic mutual inductor apparatus that formation one is integrated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210167845.0A CN102709044B (en) | 2012-05-28 | 2012-05-28 | A kind of integrated electric formula transformer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210167845.0A CN102709044B (en) | 2012-05-28 | 2012-05-28 | A kind of integrated electric formula transformer device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102709044A CN102709044A (en) | 2012-10-03 |
| CN102709044B true CN102709044B (en) | 2015-09-30 |
Family
ID=46901729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210167845.0A Expired - Fee Related CN102709044B (en) | 2012-05-28 | 2012-05-28 | A kind of integrated electric formula transformer device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102709044B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063907B (en) * | 2012-12-26 | 2016-02-17 | 武汉烽火富华电气有限责任公司 | A kind of electronic type voltage transformer signal collection system |
| CN103941082B (en) * | 2014-04-08 | 2017-02-15 | 武汉国测恒通智能仪器有限公司 | High-voltage electric energy direct metering device and method with double-channel data redundancy |
| CN110836994A (en) * | 2018-08-15 | 2020-02-25 | 大连北方互感器集团有限公司 | All-insulation type capacitor voltage transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216510A (en) * | 2008-01-02 | 2008-07-09 | 武汉国测科技股份有限公司 | High voltage electric energy direct metered system and method |
| CN101860080A (en) * | 2010-05-18 | 2010-10-13 | 武汉国测科技股份有限公司 | Distribution network metering and protection integral device suspended at high-voltage side |
| CN202600024U (en) * | 2012-05-28 | 2012-12-12 | 武汉国测恒通智能仪器有限公司 | Integrated electronic type mutual inductor device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053203A (en) * | 2010-11-04 | 2011-05-11 | 武汉国测恒通智能仪器有限公司 | Detection method and device for high-voltage power quality |
-
2012
- 2012-05-28 CN CN201210167845.0A patent/CN102709044B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216510A (en) * | 2008-01-02 | 2008-07-09 | 武汉国测科技股份有限公司 | High voltage electric energy direct metered system and method |
| CN101860080A (en) * | 2010-05-18 | 2010-10-13 | 武汉国测科技股份有限公司 | Distribution network metering and protection integral device suspended at high-voltage side |
| CN202600024U (en) * | 2012-05-28 | 2012-12-12 | 武汉国测恒通智能仪器有限公司 | Integrated electronic type mutual inductor device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102709044A (en) | 2012-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101943719B (en) | Shared-frequency asynchronous phase-checking method | |
| CN101216510B (en) | High voltage electric energy direct metered system and method | |
| CN202600024U (en) | Integrated electronic type mutual inductor device | |
| CN207730888U (en) | A kind of wind driven generator insulating state is detecting device integrated | |
| CN102709044B (en) | A kind of integrated electric formula transformer device | |
| CN110187193A (en) | Dielectric loss based on whole station voltage transformer judgement of stability monitors system and method | |
| CN104319895A (en) | Intelligent distributing line monitoring terminal | |
| CN201138510Y (en) | Wave damper for communication with low voltage electric power line carrier | |
| CN103454552A (en) | Transformer winding deformation on-line monitoring chip | |
| CN201302592Y (en) | Electrical energy measuring cabinet | |
| CN201927477U (en) | Acquisition device of electronic type optic-electric transformer | |
| CN107171235A (en) | Box-type substation | |
| CN203178369U (en) | Bushing monitoring system for intelligent substation | |
| CN109103906A (en) | A kind of three-phase power distribution system and three-phase imbalance compensation device | |
| CN201392731Y (en) | Photoelectric DC current transformer | |
| CN106972631A (en) | Integrated vacuum circuit breaker | |
| CN204390895U (en) | Integrated polytropic ratio instrument transformer | |
| CN110994787A (en) | Low-voltage distribution network automation equipment and system | |
| CN203466477U (en) | Intelligent box-type transformer substation | |
| CN206742964U (en) | Integrated vacuum circuit breaker | |
| CN201149606Y (en) | Direct measurement system for high tension electricity energy | |
| CN204631193U (en) | A kind of separate type low voltage failure cable identification device | |
| CN102496872A (en) | Intelligent civil engineering power distribution station | |
| CN209841950U (en) | Depth fusion current sensor | |
| CN202340084U (en) | Novel intelligent civil engineering power distribution substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 |