CN202471805U - Measure circuit for three-phase non-neutral triangle phase voltage - Google Patents
Measure circuit for three-phase non-neutral triangle phase voltage Download PDFInfo
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- CN202471805U CN202471805U CN2012200185663U CN201220018566U CN202471805U CN 202471805 U CN202471805 U CN 202471805U CN 2012200185663 U CN2012200185663 U CN 2012200185663U CN 201220018566 U CN201220018566 U CN 201220018566U CN 202471805 U CN202471805 U CN 202471805U
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- 238000005070 sampling Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 6
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Abstract
The utility model relates to the field of voltage measuring technology, specifically relates to a measure circuit for three-phase non-neutral triangle phase voltage, and the measure circuit comprises electronic switches and resistors, wherein one side of an electronic switch Q 1 is connected with a resistor R2, one side of an electronic switch Q 2 is connected with a resistor R 4, one side of an electronic switch Q 3 is connected with a resistor R 5, and the other side of the electronic switch Q 1 is respectively connected with the other side of the electronic switch Q 2 and the other side of the electronic switch Q 3. Compared with the prior art, an electronic switch is respectively arranged in A phase, B phase, and C phase existed in conventional voltage sampling circuit to form the measure circuit for three-phase non-neutral triangle phase voltage, root-mean-square value of alternating voltage is restored through switching and turning off the three electronic switches in turn, and phase voltage of A, B, and C three-phase alternating current is solved according to the root-mean-square value of the alternating voltage, a 120 degree phase angle of the three-phase AC, and a vector graph of the A, B, and C three-phase.
Description
Technical field
The utility model relates to the voltage measurement technical field, and specifically a kind of three-phase does not have center line triangular form phase voltage metering circuit.
Background technology
The step-down transformer of a lot of three-phase consumers all uses triangular form to connect, to save a center line cable.But, still need a virtual voltage midpoint in order to measure the phase voltage of input.Under the situation of three-phase equilibrium, virtual voltage midpoint is exactly the center line of actual sending end, zero line just, and measurement is accurately.But if imbalance of three-phase voltage, virtual mid point will squint, and the result who at this moment measures also can squint, and causes test result inaccurate.
Traditional solution is one of them RP as measurement three line voltages of input; This measuring method has following two problems: 1: phase line must directly be introduced measuring system; And generally be ground end or the power end that inserts measuring system, make that like this whole measuring system all is dangerous.2: incompatible with the metering circuit of three-phase wye connection.
Therefore, design a kind of can be when imbalance of three-phase voltage, it is vital accurately obtaining the phase voltage of three-phase alternating current and not having center line triangular form phase voltage metering circuit with the compatible three-phase of the metering circuit of three-phase wye connection.
Summary of the invention
The purpose of the utility model is the deficiency that overcomes prior art; Providing a kind of can accurately obtain the phase voltage of three-phase alternating current and not have center line triangular form phase voltage metering circuit with the compatible three-phase of the metering circuit of three-phase wye connection when imbalance of three-phase voltage.
In order to achieve the above object; The utility model comprises electronic switch and resistance; It is characterized in that: the end of electronic switch Q1 is connected with resistance R 2; The end of electronic switch Q2 is connected with resistance R 4, and the end of electronic switch Q3 is connected with resistance R 5, and the other end of electronic switch Q1 is connected with the other end of electronic switch Q2, the other end of electronic switch Q3 respectively.
The utility model is compared with prior art; In the A of traditional voltage sample circuit, B, C three-phase, respectively seal in an electronic switch; Switch in turn to turn-off through three electronic switches and reduce the root-mean-square value of alternating voltage; By 120 degree phase angles of alternating voltage root-mean-square value and three-phase alternating current and according to the polar plot of A, B, C three-phase, solve the phase voltage of A, B, C three-phase alternating current again.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Fig. 2 finds the solution the polar plot of A, B, C three-phase alternating current phase voltage for the utility model.
When Fig. 3 is higher than A phase and B phase voltage for the C phase voltage, the vector comparison diagram of the utility model and classic method measurement result.
Among Fig. 3, solid line is the result that the utility model is measured the phase voltage of A, B, C three-phase alternating current, and dotted line is the result that classic method is measured the phase voltage of A, B, C three-phase alternating current.
Embodiment
Combine accompanying drawing that the utility model is done further describes at present.
Referring to Fig. 1; Three-phase does not have center line triangular form phase voltage metering circuit and comprises electronic switch and resistance in the utility model; It is characterized in that: the end of electronic switch Q1 is connected with resistance R 2; The end of electronic switch Q2 is connected with resistance R 4, and the end of electronic switch Q3 is connected with resistance R 5, and the other end of electronic switch Q1 is connected with the other end of electronic switch Q2, the other end of electronic switch Q3 respectively.
It is specific as follows that three-phase does not have center line triangular form phase voltage measuring method in the utility model: step a, and when electronic switch Q1 disconnection, when electronic switch Q2 and electronic switch Q3 conducting, virtual mid point is the mid point of BC phase, the BC phase voltage that record this moment is BC line voltage; Step b, when electronic switch Q2 disconnection, when electronic switch Q1 and electronic switch Q3 conducting, virtual mid point is the mid point of AC phase, the AC phase voltage that record this moment is AC line voltage; Step c, when electronic switch Q3 disconnection, when electronic switch Q1 and electronic switch Q1 conducting, virtual mid point is the mid point of AB phase, the AB phase voltage that record this moment is AB line voltage; Steps d; Repeating step a, step b, step c; Electronic switch Q1, electronic switch Q2 and electronic switch Q3 switch in turn and turn-off and switch the speed of turn-offing much larger than ac period: electronic switch Q1, and electronic switch Q2 and electronic switch Q3 are controlled by high-speed microprocessor; Can reach 50HZ or the 60HZ of the switching speed of 100KHZ, the root-mean-square value of reduction alternating voltage much larger than alternating current; Step e referring to Fig. 2, by 120 degree phase angles of root-mean-square value and the known three-phase alternating current of the alternating voltage of reduction and according to the polar plot of A, B, C three-phase, solves the phase voltage of A, B, C three-phase alternating current.
Referring to Fig. 3, when the C phase voltage was higher than A phase and B phase voltage, solid line was the result that the utility model is measured the phase voltage of A, B, C three-phase alternating current, and dotted line is the result that classic method is measured the phase voltage of A, B, C three-phase alternating current.The result of the phase voltage of the utility model measurement A, B, C three-phase alternating current is more accurate than traditional measurement result.
Claims (1)
1. a three-phase does not have center line triangular form phase voltage metering circuit; Comprise electronic switch and resistance; It is characterized in that: the end of electronic switch Q1 is connected with resistance R 2; The end of electronic switch Q2 is connected with resistance R 4, and the end of electronic switch Q3 is connected with resistance R 5, and the other end of electronic switch Q1 is connected with the other end of electronic switch Q2, the other end of electronic switch Q3 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200185663U CN202471805U (en) | 2012-01-16 | 2012-01-16 | Measure circuit for three-phase non-neutral triangle phase voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200185663U CN202471805U (en) | 2012-01-16 | 2012-01-16 | Measure circuit for three-phase non-neutral triangle phase voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202471805U true CN202471805U (en) | 2012-10-03 |
Family
ID=46919957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200185663U Expired - Lifetime CN202471805U (en) | 2012-01-16 | 2012-01-16 | Measure circuit for three-phase non-neutral triangle phase voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202471805U (en) |
-
2012
- 2012-01-16 CN CN2012200185663U patent/CN202471805U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200233 A, building 391, 11 Guiping Road, Shanghai, Xuhui District, 1104-1106 Patentee after: Shanghai Wei electrical Polytron Technologies Inc. Address before: 200233 A, building 391, 11 Guiping Road, Shanghai, Xuhui District, 1104-1106 Patentee before: SHANGHAI ENLOGIC ELECTRIC TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20160226 Address after: 214028, tin Kun Road, Binhu District, Jiangsu, Wuxi, 11 Patentee after: ASIA PACIFIC CIS(WUXI)CO Ltd. Address before: 200233 A, building 391, 11 Guiping Road, Shanghai, Xuhui District, 1104-1106 Patentee before: Shanghai Wei electrical Polytron Technologies Inc. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |