CN102709044A - Integrated electronic mutual inductor device - Google Patents
Integrated electronic mutual inductor device Download PDFInfo
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- CN102709044A CN102709044A CN2012101678450A CN201210167845A CN102709044A CN 102709044 A CN102709044 A CN 102709044A CN 2012101678450 A CN2012101678450 A CN 2012101678450A CN 201210167845 A CN201210167845 A CN 201210167845A CN 102709044 A CN102709044 A CN 102709044A
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Abstract
The invention provides an integrated electronic mutual inductor device comprising a current signal collection part, a voltage signal collection part, a signal processing unit and a working power supply. A designated phase is determined in a 3-35KV three-phase AC (alternating current) power supply, and the other two phases are non-designated phases; the signal processing unit and the working power supply are directly integrated at a high potential end of the designated phase; the current signal collection part comprises a three-phase current sensor; the primary side of the three-phase current sensor is connected in a three-phase high-voltage current circuit in series; a secondary coil of the three-phase current sensor is connected to the signal processing unit of the designated phase; the voltage signal collection part comprises a first interphase voltage divider U1 and a second interphase voltage divider U2 which are connected between the two non-designated phases and the designated phase respectively; low voltage arms of the first interphase voltage divider U1 and the second interphase voltage divider U2 are connected with the designated phase;high voltage arms are connected with the non-designated phases; and a voltage dividing signal is connected into the signal processing unit on the designated phase.
Description
Technical field
The present invention relates to a kind of integrated electric formula transformer device; Belong to the electronic mutual inductor technical field; Be that a kind of all centralized arrangement is at one of integral type electric mutual inductor device of specifying the hot end of phase the same electric current of data merge cells, voltage signal acquisition converting unit, communication unit, working power, stand-by power supply, its secondary is output as the digital signal that meets the IEC61850 stipulations.
Background technology
At present the method that the voltage and current signal is carried out the digitlization conversion commonly used has a variety of on engineering.Main has following three types:
First kind; With independently traditional electromagnetic current transducer, voltage transformer separately with high voltage, big electric current reduces becomes general low-voltage, little electric current (for example: 100 volts of rated current 5 peaces or 1A, rated voltages), uses the chromacoder that is arranged on low-pressure end that the analog signal conversion of low-voltage and little electric current is digital signal corresponding then.The advantage of this technology is: it is a kind of mature technique, constant product quality.Its shortcoming mainly contains: electromagnetic current transducer and voltage transformer exist volume big, take up room greatly, the problem of the metal material of consume material, particularly labor 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 big to the influence of the little analog signals of secondary current, secondary voltage, introduces easily and disturbs, and makes protective relaying maloperation and influences certainty of measurement.The 3rd, electromagnetic potential transformer possibly produce ferro resonance under some operational mode, thereby brings out the electric power system major accident.The 4th, magnetic saturation can take place owing to use silicon steel sheet as iron core usually in electromagnetic current transducer under the very big situation of fault current, make the protective relaying device tripping.The 5th, electromagnetic current transducer, voltage transformer insulation system complicacy, its cost is the exponential relationship rising with the raising of electric pressure.In order to overcome above-mentioned shortcoming, the electronic mutual inductor new technology that began in recent years to promote the use of can address the above problem preferably.
Second kind; (be defined as a type of electronic mutual inductor by the International Power tissue with the voltage and current instrument transformer of unconventional small-signal output; It is output as the little analog signals of tens of milliamperes of electric currents and three ten-day period of hot season voltage) substitute traditional electromagnetic type instrument transformer, the protective relaying device or the chromacoder that supply to install nearby use.The characteristics of this type technology are that signals collecting conversion, data processing (merging packing) are all accomplished in low-pressure side with communicating by letter.Its advantage is electric current, voltage transformer miniaturization, volume is reduced and material savings.Simultaneously because its output valve is very little, what make thereafter signals collecting converting unit can directly use its output valve, and need not carry out the secondary conversion to analog quantity, has simplified signals collecting converting unit structure.Its shortcoming is that this switch technology is similar with traditional know-why in itself, and technology is the progress of essence not.Secondly,, be interfered more easily, can only change on the spot and use, limited the scope of application because the analog quantity of its secondary output is very little.
The third is by mutually together placing hot end to the signals collecting converting unit that is made up of modulus conversion chip and computer chip and unconventional electric current and/or voltage sensor.Obtain single-phase voltage and/or current signal in the high-pressure side; A, B, C three-phase are gathered the merge cells of the digital data transmission of the voltage and current that is converted to low-pressure side through the good optical fiber of insulation property with the high-pressure side respectively, and each phase signals that merge cells will be received is sent to data transmission network or measuring instrument, control device and protective relaying device by the packing of IEC 61850 stipulations.This is typical electronic formula 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 is simplified greatly, and volume is little, in light weight, and high more its superiority of effectiveness of electric pressure is obvious more.The second, collection conversion, the data processing of voltage and current signal and communicate by letter and all accomplish in the high-pressure side.Use optical cable rather than cable as the signal delivery means; Realized the thorough isolation of high-low pressure; The harm that does not exist electromagnetic potential transformer secondary loop short circuit or electromagnetic current transducer secondary circuit to open a way and cause to the equipment and the person, fail safe and reliability improve greatly.Three, unconventional transformer is essentially different with traditional transformer on principle, generally does magnetic without silicon sheet core and claims to close.Therefore eliminated magnetic saturation and ferro resonance phenomenon, thereby made the transient response of instrument transformer operation good, dynamic range is big, and certainty of measurement is high, and frequency response range is wide.Four, optical fiber is adopted in output, and the transfer of data antijamming capability is strong.Do not have conventional copper core secondary lead, it can make the particularly a large amount of saving of metal material of material.Five, this technology can make transducer and acquisition process unit merge fully, is easy to carry out the global error verification.Its shortcoming is: the signal of first and third phase voltage and three-phase current is by carrying out separately in the signals collecting converting unit of A, B, C three-phase respectively, to having relatively high expectations of signal synchronous collection.The second, conversion back three-phase voltage and current digital signal will be sent to the merge cells of assigned address respectively with optical fiber; Carry out transmitting to network after the packing data; The increase that this can cause alternate optical fiber communication passage makes the complex structure of communication unit and merge cells, increases a lot of electric light/opto-electronic conversion interface; Power consumption increases, and technology realizes that difficulty is bigger.Three, except increasing manufacturing cost, this structure also can increase the fault probability of happening of high-voltage signal harvester.This is a kind of new technology of popularizing gradually in recent years, and especially economic technology is with the obvious advantage in 110kV and above electric pressure.
Summary of the invention
The objective 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; Current signal collecting part, voltage signal acquisition part directly are sent to the hot end of a certain phase of integral type electric mutual inductor; At this hot end; With conversion of signals is digital signal corresponding, merges packing by the digital signal of merge cells after to conversion by stipulations requirements of IEC 61850, by communication unit through optical fiber perhaps other media signal packet is sent to measuring instrument, instrument, relaying protection, control device or the data transmission network of low-pressure end (or other high-pressure side).
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; Confirm that in the 3-35kV three-phase alternating current is specified a phase, other two is non-appointment phase mutually; Signal processing unit, working power directly are integrated in the high-voltage end of specifying phase; The 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 respectively in the three-phase high-voltage current circuit, 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 partly comprises the first alternate voltage divider U1 and the second alternate voltage divider U2; Between the first alternate voltage divider U1 and the second alternate voltage divider U2 are connected to two non-appointments and specify mutually; The low-voltage arm of the first alternate voltage divider U1 and the second alternate voltage divider U2 is connected with appointment mutually; High-voltage arm is connected with non-appointment, and voltage division signal is linked into the signal processing unit that appointment is gone up mutually.
Said alternate voltage divider uses non-ferromagnetic type transducer, like 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 molded lines circle, like Luo-coil and low power consumption current instrument transformer (LPCT); Specify first and second side of the current sensor go up mutually to be in same current potential, the current sensor that non-appointment is gone up mutually first and second between insulation isolate, withstand voltage level is according to the voltage between phases design levels.
The work energy of said signal processing unit can be supplied with by voltage divider by getting; Get and to comprise voltage divider U3 and the 4th alternate voltage divider U4 between third phase by voltage divider; The branch pressure arm of voltage divider U3 and the 4th alternate voltage divider U4 all is connected to the input of working power between third phase, gets to be connected between two non-appointments and the appointment mutually by voltage divider.
Described signal processing unit comprises signals collecting converting unit, central processing unit, merge cells, the communication unit that connects successively; Signal processing unit is operated in the high potential point of specifying phase; To specify the phase high potential is benchmark, and electric current and voltage signal are carried out synchronous acquisition, converts digital signal into; And, use optical fiber or other media to send by communication unit with the stipulations packing of digital signal according to IEC 61850.
Described integrated electric formula transformer device is provided with lithium battery and/or ultracapacitor as stand-by power supply at the high potential point of specifying phase.
Described integrated electric formula transformer device carries out electromagnetic shielding with signal processing unit, working power, stand-by power supply with can.
Described integrated electric formula transformer device; Utilize insulating material to be encapsulated in one in current signal collecting part, voltage signal acquisition part, signal processing unit, working power and connection lead thereof, thereby form an incorporate electronic mutual inductor device.
Described integrated electric formula transformer device; With current signal collecting part, voltage signal acquisition part, getting can voltage divider, signal processing unit, working power and connection lead thereof utilize insulating material to be encapsulated in one, thereby form an incorporate electronic mutual inductor device.
Described integrated electric formula transformer device; Just signal processing unit, working power, stand-by power supply carry out electromagnetic shielding with can; With current signal collecting part, voltage signal acquisition part, getting can voltage divider, metallic shield box and connect lead and utilize insulating material to be encapsulated in one, thereby form an incorporate electronic mutual inductor device.
Advantage of the present invention: the present invention and existing electronic mutual inductor compared with techniques have following innovative point:
1, (for example: the high potential point B phase) specifies phase to merge cells with directly integrated one of signals collecting converting unit, communication unit, working power, stand-by power supply; Non-appointment phase (for example: A mutually with C mutually) the current sensor secondary current be sent to the appointment phase (for example: the high potential B phase), this established technical foundation for conceptual design of the present invention.
2, specifying the synchronous acquisition that realizes on the high potential of phase three phase metering current signal, three-phase protective current signal, three voltage between phases signals, converting digital signal into; And digital signal merged packing by the requirement of IEC 61850 stipulations, be transferred to the data operative installations or the data transmission network of low-pressure end or other high-pressure side through optical fiber (or other media).
3, simplified the hardware and software design of signal processing unit (comprising signals collecting converting unit, central processing unit, merge cells and communication unit).Save many electric light/opto-electronic conversion interface circuit, make the structure of electronic circuit simpler, power consumption is littler, moves more stable.
The present invention has following advantage compared with prior art:
1, structure of the present invention is simpler, device volume is littler, it is littler to take up room.
2, the present invention can be installed on the outdoor shaft tower that low-voltage supply can not be provided, in ring main unit or the van-type transformer, satisfy the service requirement under the specific condition.
3, the present invention saves material, reduces the overall manufacturing cost of electronic mutual inductor.
4, the present invention is more easily through various high-low pressure type approval tests.
5, the synchronous error between electric current of the present invention, voltage transformer three-phase current, each signal of voltage is littler, and accuracy is higher.
Description of drawings
Fig. 1 is the theory diagram of integrated electric formula transformer device of the present invention.
Embodiment
The present invention is set directly at one of 3-35kV high-pressure side of specifying phase to signal processing unit, and its secondary is output as the digital signal that meets IEC 61850 stipulations.Be different from and existingly a signals collecting converting unit respectively be set, the building method of merge cells is set in low-pressure side at three-phase.
The present invention includes current signal collecting part, voltage signal acquisition part, signal processing unit, working power, confirm that in the 3-35kV three-phase alternating current is specified a phase, other two is non-appointment phase mutually; Signal processing unit, working power directly are integrated in the high-voltage end of specifying phase; The 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 respectively in the three-phase high-voltage current circuit, 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 partly comprises the first alternate voltage divider U1 and the second alternate voltage divider U2; Between the first alternate voltage divider U1 and the second alternate voltage divider U2 are connected to two non-appointments and specify mutually; The low-voltage arm of the first alternate voltage divider U1 and the second alternate voltage divider U2 is connected with appointment mutually; High-voltage arm is connected with non-appointment, and voltage division signal is linked into the signal processing unit that appointment is gone up mutually.
The present invention concentrates three phase metering current signal (IA1, I B1, IC1), three-phase protective current signal (IA2, I B2, IC2), three voltage between phases signals (U AB, U BC, U CA) and carries out synchronous acquisition, converts digital signal into; And digital signal merged packing by the requirement of IEC61850 stipulations, be transferred to the data operative installations or the data transmission network of low-pressure end (or other high-pressure side) through optical fiber (or other media).
Current sensor of the present invention uses Luo-coil and low power consumption current instrument transformer (LPCT) to constitute; (for example: first and second electric current of the current sensor Lb B phase) is in same current potential to specify phase; Non-appointment phase (for example: A mutually with C mutually) current sensor La, Lc first and second electric current be that insulation is isolated, the secondary current of current sensor all is connected to the current input terminal of the signals collecting converting unit of appointment phase high potential.
The present invention is specifying phase through alternate voltage divider U1 and the second alternate voltage divider U2) height point site obtain non-specify and appointment mutually between voltage between phases signal (for example: U AB, U BC).
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 (for example: the hot end B phase) specifies phase; The signals collecting converting unit is with the current potential of specifying phase current potential as a reference; Six current signals, three voltage signals are carried out synchronous acquisition; Convert digital signal corresponding into; Through data processing, merging, the digital signal of electric current after the conversion and voltage is merged packing according to the stipulations of IEC 61850, the signal after communication unit use optical fiber or small wireless or GPRS or carrier wave or infrared will be packed as communication medium is sent to measuring instrument, instrument, relaying protection, control device or the data transmission network of low-pressure end (also not discharging other hot end).
The working power of signal processing unit part of the present invention can be supplied with by voltage divider by getting; Get and to comprise voltage divider U3 and the 4th alternate voltage divider U4 between third phase by voltage divider; The branch pressure arm of voltage divider U3 and the 4th alternate voltage divider U4 all is connected to the input of working power between third phase, gets to be connected between two non-appointments and the appointment mutually by voltage divider.Get and to utilize special-purpose voltage divider (for example: by voltage divider capacitor voltage divider) for being in signals collecting converting unit, the central processing unit of specifying the phase high potential.Merge cells and communication unit provide work capacity.
The present invention carries out electromagnetic shielding with signals collecting converting unit, central processor CPU, merge cells, communication unit, power supply, stand-by power supply with can; With voltage divider U3 between three-phase current sensor La, Lb, Lc (containing three phase metering current sensor, three-phase protective current sensor), the first alternate voltage divider U1 and the second alternate voltage divider U2, third phase and the 4th alternate voltage divider U4 with the metallic shield box and be connected lead and utilize insulating material to be encapsulated in one; Thereby form an integrated electric formula transformer device, its secondary is output as the digital signal that meets IEC 61850 stipulations.
As shown in Figure 1; (for example: the hot end B phase) has obtained after above-mentioned voltage secondary singal and the electric current secondary singal specifying phase; (for example: the current potential B phase) is current potential as a reference, concentrates the synchronized sampling that carries out six magnitudes of current, three voltages, converts the corresponding digital amount into to specify phase by the signals collecting converting unit.The principle of compositionality of signal processing unit is identical with low-pressure end signals collecting conversion equipment with method.Signal processing unit in high potential operation is different with the running environment of low-pressure end signal pickup assembly, need carry out special electromagnetic shielding protection to signal processing unit and design.In addition, the power consumption of signal processing unit also will design less than the power consumption of traditional low-pressure end signals collecting converting unit.
As shown in Figure 1, (for example: on the high potential B phase) all be in the appointment phase at signal processing unit of the present invention.So the result of signal processing unit need be delivered to the device or the network of cold end (also not discharging other hot end) appointment through communication channel, offer the person of needs of signals collecting transformation result.Can use optical fiber or small wireless or GPRS or carrier wave or infrared the completion with specified device or network to communicate by letter as communication medium; Mail to object to the result of the three phase metering electric current that collects, three-phase protective electric current, three-phase voltage electric parameters, thereby accomplish the communication transmission of collection result from the hot end to the cold end.
The present invention can be installed on indoor or the outdoor or overhead line structures of 3-35kV transformer and distribution power station or in ring main unit or the van-type transformer.
Claims (10)
1. an integrated electric formula transformer device comprises current signal collecting part, voltage signal acquisition part, signal processing unit, working power, it is characterized in that: confirm that in the 3-35kV three-phase alternating current is specified a phase, other two is non-appointment phase mutually; Signal processing unit, working power directly are integrated in the high-voltage end of specifying phase; The 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 respectively in the three-phase high-voltage current circuit, 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 partly comprises the first alternate voltage divider U1 and the second alternate voltage divider U2; Between the first alternate voltage divider U1 and the second alternate voltage divider U2 are connected to two non-appointments and specify mutually; The low-voltage arm of the first alternate voltage divider U1 and the second alternate voltage divider U2 is connected with appointment mutually; High-voltage arm is connected with non-appointment, and voltage division signal is linked into the signal processing unit that appointment is gone up mutually.
2. integrated electric formula transformer device according to claim 1 is characterized in that: alternate voltage divider uses non-ferromagnetic type transducer, like capacitor voltage divider or resitstance voltage divider or RC divider.
3. integrated electric formula transformer device according to claim 1 and 2 is characterized in that: every phase current transducer has one or two secondary current coil, uses non-ferromagnetic molded lines circle, like Luo-coil and low power consumption current instrument transformer; Specify first and second side of the current sensor go up mutually to be in same current potential, the current sensor that non-appointment is gone up mutually first and second between insulation isolate, withstand voltage level is according to the voltage between phases design levels.
4. integrated electric formula transformer device according to claim 1 and 2; It is characterized in that: the work energy of signal processing unit can be supplied with by voltage divider by getting; Get and to comprise voltage divider U3 and the 4th alternate voltage divider U4 between third phase by voltage divider; The branch pressure arm of voltage divider U3 and the 4th alternate voltage divider U4 all is connected to the input of working power between third phase, gets to be connected between two non-appointments and the appointment mutually by voltage divider.
5. integrated electric formula transformer device according to claim 1 and 2; It is characterized in that: signal processing unit comprises signals collecting converting unit, central processing unit, merge cells, the communication unit that connects successively; Signal processing unit is operated in the high potential point of specifying phase; To specify the phase high potential is benchmark, and electric current and voltage signal are carried out synchronous acquisition, converts digital signal into; And, use optical fiber or other media to send by communication unit with the stipulations packing of digital signal according to IEC 61850.
6. 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 at the high potential point of specifying phase.
7. integrated electric formula transformer device according to claim 1 and 2 is characterized in that: signal processing unit, working power are carried out electromagnetic shielding with can.
8. integrated electric formula transformer device according to claim 1 and 2; It is characterized in that: utilize insulating material to be encapsulated in one in current signal collecting part, voltage signal acquisition part, signal processing unit, working power and connection lead thereof, thereby form an incorporate electronic mutual inductor device.
9. integrated electric formula transformer device according to claim 4; It is characterized in that: with current signal collecting part, voltage signal acquisition part, getting can voltage divider, signal processing unit, working power and connection lead thereof utilize insulating material to be encapsulated in one, thereby form an incorporate electronic mutual inductor device.
10. integrated electric formula transformer device according to claim 6; It is characterized in that: signal processing unit, working power, stand-by power supply are carried out electromagnetic shielding with can; With current signal collecting part, voltage signal acquisition part, getting can voltage divider, metallic shield box and connect lead and utilize insulating material to be encapsulated in one, thereby form an incorporate electronic mutual inductor device.
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| CN201210167845.0A CN102709044B (en) | 2012-05-28 | 2012-05-28 | A kind of integrated electric formula transformer device |
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| CN201210167845.0A CN102709044B (en) | 2012-05-28 | 2012-05-28 | A kind of integrated electric formula transformer device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063907A (en) * | 2012-12-26 | 2013-04-24 | 武汉烽火富华电气有限责任公司 | Electronic type voltage transformer signal collection system |
| CN103941082A (en) * | 2014-04-08 | 2014-07-23 | 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 |
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| 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 |
| WO2012059061A1 (en) * | 2010-11-04 | 2012-05-10 | 武汉国测恒通智能仪器有限公司 | Method and device for quality-monitoring of high-voltage electrical energy |
| 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 |
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2012
- 2012-05-28 CN CN201210167845.0A patent/CN102709044B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| WO2012059061A1 (en) * | 2010-11-04 | 2012-05-10 | 武汉国测恒通智能仪器有限公司 | Method and device for quality-monitoring of high-voltage electrical energy |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063907A (en) * | 2012-12-26 | 2013-04-24 | 武汉烽火富华电气有限责任公司 | Electronic type voltage transformer signal collection system |
| 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 |
| CN103941082A (en) * | 2014-04-08 | 2014-07-23 | 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 |
| 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 |
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