CN201378184Y - Triphase four-wire system high voltage electric energy meter - Google Patents
Triphase four-wire system high voltage electric energy meter Download PDFInfo
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- CN201378184Y CN201378184Y CN200820214329U CN200820214329U CN201378184Y CN 201378184 Y CN201378184 Y CN 201378184Y CN 200820214329 U CN200820214329 U CN 200820214329U CN 200820214329 U CN200820214329 U CN 200820214329U CN 201378184 Y CN201378184 Y CN 201378184Y
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Abstract
The utility model relates to a triphase four-wire system high voltage electric energy meter, comprising a voltage mutual inductor unit, a current mutual inductor unit and a triphase four-wire system low-voltage energy meter, wherein the one end of the voltage mutual inductor unit is connected with a high-voltage buss and the other end is connected with the earth; the current mutual inductor unit is connected with a high-voltage buss in series; the input end of the triphase four-wire system low-voltage energy meter is connected with the output end of the voltage mutual inductor unit and the current mutual inductor unit. In the technical proposal of the utility model, the electric energy metering device has the advantages of small volume and light weight; and the electron device works on the low voltage side with the advantages of high reliability and stability.
Description
Technical field
The utility model relates to the high-voltage electric energy measurement technology, is specifically related to a kind of a kind of three-phase four-wire high voltage energy table 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.
The utility model content
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, and the utility model provides a kind of three-phase four-wire high voltage energy table.
The technical scheme that the prior art problem that solves the utility model is adopted is: a kind of three-phase four-wire high voltage energy table is provided, described three-phase four-wire high voltage energy table 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 utility model: 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 utility model: 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 utility model: 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 utility model: 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 utility model: but described current transformer unit is sieve Paderewski coil.
According to an optimal technical scheme of the present utility model: described three-phase four-wire high voltage energy table 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 utility model is: with respect to High-voltage measuring box (cabinet), the high-voltage electric-energy meter volume in the technical solutions of the utility model 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 solutions of the utility model 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 utility model and the device;
Fig. 2. three-phase four-wire high voltage energy table modular structure synoptic diagram in a kind of three-phase four-wire high voltage energy measuring method of the utility model and the device;
Fig. 3. the three-phase four-wire high voltage energy table modular structure synoptic diagram behind the employing low-power current transformer;
But Fig. 4. the three-phase four-wire high voltage energy table modular structure synoptic diagram behind employing sieve Paderewski coil;
Fig. 5. the three-phase four-wire high voltage energy table modular structure synoptic diagram behind the employing resistance divider;
Fig. 6. the three-phase four-wire high voltage energy table modular structure synoptic diagram behind the employing condenser divider.
Embodiment:
The utility model is described in further detail 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 utility model 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.
Method in the first step described in the optimal technical scheme of the present utility model is: by voltage transformer (VT) unit 2 high voltage signal is converted to
Low voltage signal, big current signal is transformed to the little current signal of low-voltage of 225mV 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 table modular structure synoptic diagram in a kind of three-phase four-wire high voltage energy measuring method of Fig. 2 the utility model and the device.As shown in FIG.: described three-phase four-wire high voltage energy table 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 voltage transformer (VT) unit described in the optimal technical scheme of the present utility model.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 table 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 table 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 table 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 table 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 utility model is: with respect to High-voltage measuring box (cabinet), the high-voltage electric-energy meter volume in the technical solutions of the utility model 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 solutions of the utility model 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 utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (7)
1. three-phase four-wire high voltage energy table, it is characterized in that: described three-phase four-wire high voltage energy table 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. according to the described three-phase four-wire high voltage energy table of claim 1, it is characterized in that: described voltage transformer (VT) unit (2) is resistance-type partial pressure unit or capacitive partial pressure unit.
3. according to the described three-phase four-wire high voltage energy table of claim 1, 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.
4. according to the described three-phase four-wire high voltage energy table of claim 1, 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).
5. according to the described three-phase four-wire high voltage energy table of claim 1, it is characterized in that: described voltage transformer (VT) unit (2) operates in the hi-line terminal with described current transformer unit (3).
6. according to the described three-phase four-wire high voltage energy table of claim 1, it is characterized in that: described current transformer unit (3) but for sieve Paderewski coil.
7. according to the described three-phase four-wire high voltage energy table of claim 1, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820214329U CN201378184Y (en) | 2008-12-05 | 2008-12-05 | Triphase four-wire system high voltage electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820214329U CN201378184Y (en) | 2008-12-05 | 2008-12-05 | Triphase four-wire system high voltage electric energy meter |
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| Publication Number | Publication Date |
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| CN201378184Y true CN201378184Y (en) | 2010-01-06 |
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| CN200820214329U Expired - Lifetime CN201378184Y (en) | 2008-12-05 | 2008-12-05 | Triphase four-wire system high voltage electric energy meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608414A (en) * | 2012-03-28 | 2012-07-25 | 山东计保电气有限公司 | Embedded electric energy measuring method and application extension method of high voltage electrical switchgear |
| CN106546784A (en) * | 2015-09-18 | 2017-03-29 | 侯飞 | A kind of cable accessory constructs the plug-in unit and method of high-voltage electric energy meter |
| CN110161448A (en) * | 2019-04-26 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of 10kV portable high-pressure wideband electric energy on-site calibrating method and device |
-
2008
- 2008-12-05 CN CN200820214329U patent/CN201378184Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608414A (en) * | 2012-03-28 | 2012-07-25 | 山东计保电气有限公司 | Embedded electric energy measuring method and application extension method of high voltage electrical switchgear |
| CN102608414B (en) * | 2012-03-28 | 2014-05-07 | 山东计保电气有限公司 | Embedded electric energy measuring method and application extension method of high voltage electrical switchgear |
| CN106546784A (en) * | 2015-09-18 | 2017-03-29 | 侯飞 | A kind of cable accessory constructs the plug-in unit and method of high-voltage electric energy meter |
| CN110161448A (en) * | 2019-04-26 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of 10kV portable high-pressure wideband electric energy on-site calibrating method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN STAR DRAGON TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHENZHEN XINGLONG SCIENCE AND TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 1203, room 4050, SAIC building, No. 518000 Nanhai Road, Shenzhen, Guangdong, Nanshan District Patentee after: SHENZHEN CITY STAR DRAGON TECHNOLOGY CO., LTD. Address before: 518057 West Tower, Nanshan Software Park, No. 10128 Shennan Road, Guangdong, Shenzhen, 1107, 1108, 1109, and No. 3, Nanshan District Patentee before: Shenzhen Xinglong Technology Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100106 |
|
| CX01 | Expiry of patent term |