CN101424713A - Three-phase four-wire high voltage energy measuring method and device - Google Patents
Three-phase four-wire high voltage energy measuring method and device Download PDFInfo
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- CN101424713A CN101424713A CNA2008102181171A CN200810218117A CN101424713A CN 101424713 A CN101424713 A CN 101424713A CN A2008102181171 A CNA2008102181171 A CN A2008102181171A CN 200810218117 A CN200810218117 A CN 200810218117A CN 101424713 A CN101424713 A CN 101424713A
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Abstract
The invention relates to a three-phase four-wire system high-voltage electric energy metering method and a three-phase four-wire system high-voltage electric energy metering. The three-phase four-wire system high-voltage electric energy metering method comprises the steps that: firstly, a high-voltage high-current signal is converted into a low-voltage low-current signal; and secondly, the low-voltage low-current signal is accessed into the three-phase four-wire system electric energy metering device to measure electric energy. The three-phase four-wire system high-voltage electric energy metering device comprises a voltage mutual inductor unit, a current mutual inductor unit and a three-phase four-wire system low-voltage electric energy meter, wherein one end of the voltage mutual inductor unit is connected into a high-voltage bus, the other end of the voltage mutual inductor unit is grounded, the current mutual inductor unit is connected to the high-voltage bus in series, and the input end of the three-phase four-wire system low-voltage electric energy meter is connected with the output ends of the voltage mutual inductor unit and the current mutual inductor unit. In the technical proposal of the invention, the high-voltage electric energy metering device has small volume, light weight and high reliability and stability and is operated on a low-voltage side.
Description
Technical field
The present invention relates to the high-voltage electric energy measurement technology, be specifically related to a kind of a kind of three-phase four-wire high voltage energy measuring method and device by becoming the little current signal of low-voltage to measure on high-tension side high-voltage large current conversion of signals.
Background technology
The device that is used for high-voltage electric energy measurement in the prior art mainly is High-voltage measuring box and high-voltage metering cubicle, by be connected across A-B mutually with C-B two voltage transformer (VT) mutually be serially connected in A, C two current transformers and three-phase two elements electric energy meter mutually and form.Because the insulating requirements height of high-voltage mutual inductor, be that 42Kv, secondary rated load have that 10VA so volume and weight are all quite big, price is high, installing space is big in the 10Kv electric system.
In order to solve the problems of the technologies described above, Wuhan state survey company had designed a kind of high-voltage electric energy meter in 2004.It is a kind of by the high pressure gauge meter that is connected across two alternate single-phase high voltage electric power meters of A-B and C-B, use capacitance type potential transformer, have advantages such as volume is little, in light weight, but its all electron device must have a power failure and could overhaul after all being operated in high-pressure side,, fault high to reliability requirement.And big on high-tension side power taking difficulty, reliability is difficult to guarantee.
Summary of the invention
In order to solve the insulating requirements height of the high-voltage mutual inductor that exists in the prior art, in the 10Kv electric system is must have a power failure and could overhaul after 42Kv, secondary rated load have 10VA so volume and weight are all quite big, price is high, installing space is big and adopt Wuhan state survey company to design the high-voltage electric energy meter electron device all because of it all to be operated in high-pressure side,, fault high to reliability requirement, and it is big on high-tension side power taking difficulty, reliability is difficult to guarantee these technical matterss, the invention provides a kind of three-phase four-wire high voltage energy measuring method.
Principle the present invention according to described three-phase four-wire high voltage energy measuring method also provides a kind of three-phase four-wire high voltage energy measuring apparatus.
The present invention solves the technical scheme that the prior art problem adopted: a kind of three-phase four-wire high voltage energy measuring method is provided, and described three-phase four-wire high voltage energy measuring method comprises step: the first, the high-voltage large current conversion of signals is become the little current signal of low-voltage; The second, the little current signal of described low-voltage is inserted the three-phase four-wire system electric power meter and carry out electric energy measurement.
According to an optimal technical scheme of the present invention: the concrete grammar of the described first step is for to be converted to high voltage signal by the voltage transformer (VT) unit
Low voltage signal, by the current transformer unit little current signal of low-voltage that will once to survey big electric current quadratic transformation be 225mV.
According to an optimal technical scheme of the present invention: described second step comprises substep: one, the little current signal of low-voltage with described 225mV carries out Signal Regulation; Two, the signal after will regulating inserts the current/voltage multiplier input of metering input mutually of one among A, B, the C of three-phase electric energy chip in the three-phase four-wire system electric power meter; Three, other two-phases also are input to the input end of the current/voltage multiplier of metering input; Four, obtain electrical energy pulse output by described current/voltage multiplier and time integral; Five, by the SPI interface data are sent to central processor unit and carry out electric energy measurement.
Principle the present invention according to described three-phase four-wire high voltage energy measuring method also provides a kind of three-phase four-wire high voltage energy measuring apparatus, described three-phase four-wire high voltage energy measuring apparatus comprises: the voltage transformer (VT) unit, current transformer unit and three-phase four-wire low-voltage electric energy meter, wherein, described voltage transformer (VT) unit one termination is gone into high voltage bus, the other end inserts the earth by ground terminal, described current transformer units in series is on high voltage bus, and the input end of described three-phase four-wire low-voltage electric energy meter is connected with the output terminal of described voltage transformer (VT) unit with described current transformer unit.
According to an optimal technical scheme of the present invention: described voltage transformer (VT) unit is resistance-type partial pressure unit or capacitive partial pressure unit.
According to an optimal technical scheme of the present invention: described current transformer unit be the low-power current transformer and with described low-power current transformer parallel resistor.
According to an optimal technical scheme of the present invention: the coaxial cable connector that is connected to the band shielding of described voltage transformer (VT) unit and described current transformer unit or the coaxial cable connector of band double shield.
According to an optimal technical scheme of the present invention: described voltage transformer (VT) unit and described current transformer unit operate in the hi-line terminal.
According to an optimal technical scheme of the present invention: but described current transformer unit is sieve Paderewski coil.
According to an optimal technical scheme of the present invention: described three-phase four-wire low-voltage electric energy meter comprises power module, peripheral module, central processor unit and electric energy computation chip, wherein, described electric energy computation chip, described power module and described peripheral module are connected with described central processor unit respectively.
After comparing with existing technical scheme, useful effect of the present invention is: with respect to High-voltage measuring box (cabinet), the high-voltage electric-energy meter volume in the technical solution of the present invention is small and exquisite, in light weight; Survey the high-voltage electric energy meter of company with respect to Wuhan state, the high-voltage electric energy meter in the technical solution of the present invention is operated in low-pressure side, and simplicity of design, reliability height are with low cost.
Description of drawings
Fig. 1. three-phase four-wire high voltage energy measuring method process flow diagram in a kind of three-phase four-wire high voltage energy measuring method of the present invention and the device;
Fig. 2. three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram in a kind of three-phase four-wire high voltage energy measuring method of the present invention and the device;
Fig. 3. the three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram behind the employing low-power current transformer;
But Fig. 4. the three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram behind employing sieve Paderewski coil;
Fig. 5. the three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram behind the employing resistance divider;
Fig. 6. the three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram behind the employing condenser divider.
Embodiment:
The invention will be further described below in conjunction with drawings and Examples:
Among the figure: A, B, the primary current conductor 1 of C three-phase electrical power system, voltage transformer (VT) unit 2, current transformer unit 3, central processor unit 4, electric energy computation chip 5, three-phase four-wire low-voltage electric energy meter 6, peripheral module 7, power module 8, connecting line 9, ground terminal 10, current integrator 11, multiplier 12, SPI interface 13, resistance 14, low-power current transformer 15, but sieve Paderewski coil 16, the high-pressure side divider resistance 17 of Resistive Voltage Transformer, the low-pressure side divider resistance 18 of Resistive Voltage Transformer, the high-pressure side dividing potential drop electric capacity 19 of capacitance type potential transformer, the low-pressure side dividing potential drop electric capacity 20 of capacitance type potential transformer.
See also three-phase four-wire high voltage energy measuring method process flow diagram in a kind of three-phase four-wire high voltage energy measuring method of Fig. 1 the present invention and the device.As shown in Figure 1, described three-phase four-wire high voltage energy measuring method comprises step: the first, the high-voltage large current conversion of signals is become the little current signal of low-voltage; The second, the little current signal of described low-voltage is inserted the three-phase four-wire system electric power meter and carry out electric energy measurement.
Be specially in the first step described in the preferred technical solution of the present invention: high voltage signal is converted to by voltage transformer (VT) unit 2
Low voltage signal, be the little current signal of low-voltage of 225mV with the big current transformation of described primary side by current transformer unit 3.Described second step comprises substep: one, the little current signal of low-voltage with described 225mV carries out Signal Regulation; Two, the signal after will regulating inserts current/voltage multiplier 12 input ends of metering input mutually of one among A, B, the C of three-phase electric energy chip in the three-phase four-wire system electric power meter; Three, other two-phases also are input to the input end of the current/voltage multiplier 12 of metering input; Four, obtain electrical energy pulse output by described current/voltage multiplier 12 and time integral; Five, by SPI interface 13 data are sent to central processor unit 4 and carry out electric energy measurement.、
See also three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram in a kind of three-phase four-wire high voltage energy measuring method of Fig. 2 the present invention and the device.As shown in FIG.: described three-phase four-wire high voltage energy measuring apparatus comprises: voltage transformer (VT) unit 2, current transformer unit 3 and three-phase four-wire low-voltage electric energy meter 6, wherein, described voltage transformer (VT) unit 2 one terminations are gone into high voltage bus, the other end inserts the earth by ground terminal 10, described current transformer unit 3 is connected on the high voltage bus, and the input end of described three-phase four-wire low-voltage electric energy meter 6 is connected with the output terminal of described voltage transformer (VT) unit 2 with described current transformer unit 3.
2 are the coaxial cable connector of band shielding or the coaxial cable connector of band double shield with the connecting line 9 of described current transformer unit 3 in the unit of voltage transformer (VT) described in the preferred technical solution of the present invention.Described three-phase four-wire low-voltage electric energy meter 6 comprises power module 8, peripheral module 7, central processor unit 4 and electric energy computation chip 5, wherein, described electric energy computation chip 5, described power module 8 and described peripheral module 7 are connected with described central processor unit 4 respectively.
See also the three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram after Fig. 3 adopts low-power current transformer 15, among the figure, described current transformer unit 3 adopts low-power current transformer 15, as shown in Figure 3, then export Vi=Ki * I * R by being connected in series a small resistor behind the current signal that electromagnetic induction produces with primary current is directly proportional; I is a primary side current in the formula, and K is the LPCT no-load voltage ratio, and R is the high precision small resistor, and Vi is a current transformer parallel resistance output signal.
See also the three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram after but Fig. 4 adopts sieve Paderewski coil 16, among the figure, but described current transformer unit 3 adopts sieve Paderewski air core coil, as shown in Figure 4, produce voltage signal e (t)=Di * dI/dt that is directly proportional with the primary current differential by electromagnetic induction; I is a primary side current in the formula, the Di differential coefficient, e (t) but be sieve Paderewski air core coil output signal.
Three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram behind the described voltage transformer (VT) unit 2 employing resistance dividers produces one and primary voltage V corresponding voltage signal Vv=Kv * V by dividing potential drop as shown in Figure 5; V is the primary side voltage signal in the formula, and Kv is a voltage change ratio, and Vv is the voltage after partial signal.
Three-phase four-wire high voltage energy measuring apparatus modular structure synoptic diagram behind the described voltage transformer (VT) unit 2 employing condenser dividers produces one and primary voltage V corresponding voltage signal Vv=Kv * V by dividing potential drop as shown in Figure 6; V is the primary side voltage signal in the formula, and Kv is a voltage change ratio, and Vv is the voltage after partial signal.
The small-signal that comes out from described voltage sensor unit and described current sensor unit, be sent to current/voltage multiplier 12 input ends of metering input mutually of one among A, B, the C of three-phase electric energy chip respectively, simultaneously other two-phases also are input to the input end of the current/voltage multiplier 12 of metering input, obtain electrical energy pulse output by multiplier 12 and time integral, data are sent to central processor unit 4 by SPI interface 13.Described central processor unit 4 is processed as data processing and satisfies various data and the curve that electric energy meter 6 requires.But the electric energy chip inside for the current transformer unit 3 of sieve Paderewski air core coil formula has current integrator 11, can be sending into multiplier 12 metering electric energy after the differential signal reduction again.
After comparing with existing technical scheme, useful effect of the present invention is: with respect to High-voltage measuring box (cabinet), the high-voltage electric-energy meter volume in the technical solution of the present invention is small and exquisite, in light weight; Survey the high-voltage electric energy meter 6 of company with respect to Wuhan state, the high-voltage electric energy meter 6 in the technical solution of the present invention is operated in low-pressure side, and simplicity of design, reliability height are with low cost.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. three-phase four-wire high voltage energy measuring method, it is characterized in that: described three-phase four-wire high voltage energy measuring method comprises step:
A: the high-voltage large current conversion of signals is become the little current signal of low-voltage;
B: the little current signal of described low-voltage is inserted the three-phase four-wire system electric power meter carry out electric energy measurement.
2. according to the described three-phase four-wire high voltage energy measuring method of claim 1, it is characterized in that: described steps A is specially: by voltage transformer (VT) unit (2) high voltage signal is converted to
Low voltage signal, be the little current signal of low-voltage of 225mV with big current transformation by current transformer unit (3).
3. according to the described three-phase four-wire high voltage energy measuring method of claim 1, it is characterized in that: described step B comprises substep:
B1: the little current signal of low-voltage of described 225mV is carried out Signal Regulation;
B2: one in the signal access three-phase four-wire system electric power meter after will regulating among A, the B of three-phase electric energy chip, the C be the current/voltage multiplier input of metering input mutually;
B3: the input end that other two-phases also is input to the current/voltage multiplier of metering input;
B4: obtain electrical energy pulse output by described current/voltage multiplier and time integral;
B5: by the SPI interface data are sent to central processor unit (4) and carry out electric energy measurement.
4. three-phase four-wire high voltage energy measuring apparatus, it is characterized in that: described three-phase four-wire high voltage energy measuring apparatus comprises: voltage transformer (VT) unit (2), current transformer unit (3) and three-phase four-wire low-voltage electric energy meter (6), wherein, described voltage transformer (VT) unit (2) one terminations are gone into high voltage bus, the other end inserts the earth by ground terminal (10), described current transformer unit (3) is connected on the high voltage bus, and the input end of described three-phase four-wire low-voltage electric energy meter (6) is connected with the output terminal of described voltage transformer (VT) unit (2) with described current transformer unit (3).
5. according to the described three-phase four-wire high voltage energy measuring apparatus of claim 4, it is characterized in that: described voltage transformer (VT) unit (2) is resistance-type partial pressure unit or capacitive partial pressure unit.
6. according to the described three-phase four-wire high voltage energy measuring apparatus of claim 4, it is characterized in that: described current transformer unit (3) for the low-power current transformer and with described low-power current transformer parallel resistor.
7. according to the described three-phase four-wire high voltage energy measuring apparatus of claim 4, it is characterized in that: described voltage transformer (VT) unit (2) is the coaxial cable connector of band shielding or the coaxial cable connector of band double shield with the connecting line of described current transformer unit (3).
8. according to the described three-phase four-wire high voltage energy measuring apparatus of claim 4, it is characterized in that: described voltage transformer (VT) unit (2) operates in the hi-line terminal with described current transformer unit (3).
9. according to the described three-phase four-wire high voltage energy measuring apparatus of claim 4, it is characterized in that: described current transformer unit (3) but for sieve Paderewski coil.
10. according to the described three-phase four-wire high voltage energy measuring apparatus of claim 4, it is characterized in that: described three-phase four-wire low-voltage electric energy meter (6) comprises power module (8), peripheral module (7), central processor unit (4) and electric energy computation chip (5), wherein, described electric energy computation chip (5), described power module (8) and described peripheral module (7) are connected with described central processor unit (4) respectively.
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| CNA2008102181171A CN101424713A (en) | 2008-12-05 | 2008-12-05 | Three-phase four-wire high voltage energy measuring method and device |
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| CN102384996A (en) * | 2011-10-13 | 2012-03-21 | 南京苏特电气股份有限公司 | Power transformer with high-voltage side power collecting signals |
| CN102435832A (en) * | 2011-10-13 | 2012-05-02 | 北京交通大学 | Single-phase distribution transformer operation monitoring metering device |
| CN102539909A (en) * | 2010-12-21 | 2012-07-04 | 珠海威瀚科技发展有限公司 | Electric energy metering module |
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| CN102707139A (en) * | 2012-05-28 | 2012-10-03 | 侯铁信 | Method and device for measuring high-voltage three-phase electric power |
| CN103293374A (en) * | 2013-06-04 | 2013-09-11 | 陈永山 | Three-phase access type electric energy meter with electronic transformers and metering method for three phase access type electric energy meter |
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| CN102570842A (en) * | 2010-12-30 | 2012-07-11 | 意法半导体研发(深圳)有限公司 | Combined power and timing signals for equipment |
| CN102570842B (en) * | 2010-12-30 | 2015-05-20 | 意法半导体研发(深圳)有限公司 | Three-phase power system and other methods |
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| CN102435832A (en) * | 2011-10-13 | 2012-05-02 | 北京交通大学 | Single-phase distribution transformer operation monitoring metering device |
| CN102435832B (en) * | 2011-10-13 | 2013-11-20 | 北京交通大学 | Single-phase distribution transformer operation monitoring metering device |
| CN102384996A (en) * | 2011-10-13 | 2012-03-21 | 南京苏特电气股份有限公司 | Power transformer with high-voltage side power collecting signals |
| CN102707139A (en) * | 2012-05-28 | 2012-10-03 | 侯铁信 | Method and device for measuring high-voltage three-phase electric power |
| CN103293374A (en) * | 2013-06-04 | 2013-09-11 | 陈永山 | Three-phase access type electric energy meter with electronic transformers and metering method for three phase access type electric energy meter |
| 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 |
| CN106199176A (en) * | 2016-06-30 | 2016-12-07 | 芯海科技（深圳）股份有限公司 | A kind of multifunctional electric energy metering circuit saving system resource |
| CN106771575A (en) * | 2017-01-03 | 2017-05-31 | 陈永山 | A kind of three element high-voltage meters |
| CN107345975A (en) * | 2017-07-21 | 2017-11-14 | 国家电网公司 | A kind of method of electric energy metrical conversion equipment and the application device |
| CN107345975B (en) * | 2017-07-21 | 2023-10-13 | 国网安徽省电力公司铜陵供电公司 | Electric energy metering conversion device and method for applying same |
| CN107561326A (en) * | 2017-09-27 | 2018-01-09 | 四川德阳德仪电子仪器有限公司 | Electric power meter and power supply management system |
| CN107561326B (en) * | 2017-09-27 | 2024-01-30 | 四川德阳德仪电子仪器有限公司 | Electric energy metering device and power supply management system |
| CN108267624A (en) * | 2018-02-23 | 2018-07-10 | 南京飞腾电子科技有限公司 | Electronic electric energy meter |
| CN109100554A (en) * | 2018-09-25 | 2018-12-28 | 武汉德能电网技术有限公司 | It is a kind of to dismount convenient and fast high-voltage electric-energy meter and installation method |
| CN109100554B (en) * | 2018-09-25 | 2024-01-16 | 武汉德能电网技术有限公司 | High-voltage electric energy metering device convenient to assemble and disassemble and mounting method |
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