CN201237618Y - Phase voltage detection circuit for three-phase three-wire system electric network - Google Patents
Phase voltage detection circuit for three-phase three-wire system electric network Download PDFInfo
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- CN201237618Y CN201237618Y CNU2008201088556U CN200820108855U CN201237618Y CN 201237618 Y CN201237618 Y CN 201237618Y CN U2008201088556 U CNU2008201088556 U CN U2008201088556U CN 200820108855 U CN200820108855 U CN 200820108855U CN 201237618 Y CN201237618 Y CN 201237618Y
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Abstract
The utility model relates to a phase voltage detection circuit of three-phase three-wire system power grid, comprising three groups of resistances, wherein, each group of resistances are connected in series by a plurality of resistances with equal value, and the number of each group of resistances is equal; each group of resistances have a first terminal and a second terminal; the first terminal of every group of resistances is respectively connected with the three-wire phase of the three-phase three-wire system power grid, and the second terminal of every group of resistances is connected with each other to earth; the resistance closest to the second terminal of each group of resistances is connected in parallel with a capacitor for outputting filtering. The circuit used for detecting the phase voltage of the three-phase three-wire system power grid has the characteristics of simplicity and low cost.
Description
Technical field
The utility model relates to a kind of voltage detecting circuit, especially a kind of phase voltage testing circuit that is used for the three-phase three-wire system electrical network.
Background technology
On commercial unit, usually need to detect the phase voltage of three-phase three-wire system electrical network.At this moment, owing to there is not zero line,, do not bring difficulty to measurement as the zero potential of benchmark.In addition, very dangerous because three-phase electricity is far above safe voltage, can't directly introduce low-voltage circuit and measure.Therefore, traditional detection method is to use specific detection means, after high-pressure side, low-pressure side are thoroughly isolated, will characterize high-tension amount again and be delivered to low-pressure side by non electrical quantity.
Three-phase electricity phase voltage detection method commonly used has four kinds: first kind, adopt the voltage Hall, and isolate and measure phase voltage; Second kind, adopt synchrotrans, isolate and measure phase voltage; The third adopts linear optical coupling, isolates and measures phase voltage; The 4th kind, after the high-pressure side is detected,, be delivered to low-pressure side by optical communication again with signal encoding.As shown in Figure 1, it is Chinese patent CN1243245C patent, this patent adopts the electric resistance partial pressure method to measure high voltage, measured high voltage is divided on the big resistance value divider resistance, and will on three check points of high, medium and low voltage of divider resistance, get suitable sampled voltage, carry out digitizing again, with the electric communication means of isolating of going up, the digital signal of three check points is delivered on the output processing apparatus of low potential side, sent digitized measurement result after handling.
The above-mentioned method of enumerating is all very feasible, however complex structure, and cost is all very high.
Summary of the invention
The purpose of this utility model provides a kind of phase voltage testing circuit of three-phase three-wire system electrical network, to overcome three-phase electricity phase voltage pick-up unit complex structure, defect of high cost in the prior art.
The utility model is achieved in that a kind of phase voltage testing circuit of three-phase three-wire system electrical network, and this phase voltage testing circuit comprises:
Three groups of resistance, every group of resistance is in series mutually by the identical resistance of a plurality of resistances, and the quantity of every group of resistance equates;
Every group of resistance has one first end and one second end, and each first end of organizing resistance is connected with the three-way of three-phase three-wire system electrical network respectively, each second end of organizing resistance ground connection that interconnects;
Close on most a resistance electric capacity in parallel of second end in every group of resistance, be used to export filtering.
The described all-in resistance of respectively organizing is greater than 5 megohms.
Described electric capacity adopts low capacity electric capacity.
Thus, advantage of the present utility model and characteristics are: the phase voltage testing circuit of three-phase three-wire system electrical network of the present utility model adopts the similar resistance resistance string to be unified into three groups, and star-like connection, at the zero line of central point constructing virtual, and the partial pressure value of phase voltage is provided, as output signal.So both guarantee safety, and do not needed strong, weak electricity to isolate again.Owing to need not detection means such as voltage Hall, synchrotrans, linear optical coupling, also need between the strong, weak electricity system, not communicate, so provide cost savings.
Description of drawings
The following drawings only is intended to the utility model is schematically illustrated and explains, is not limited in scope of the present utility model.Among the figure,
Fig. 1 is the block diagram of prior art high voltage pick-up unit;
Fig. 2 is the circuit structure diagram of the phase voltage testing circuit of the utility model three-phase three-wire system electrical network.
Embodiment
For making 26S Proteasome Structure and Function of the present utility model clear more understandable, now be described with reference to the accompanying drawings as follows:
Please refer to Fig. 2, Fig. 2 is the circuit structure diagram of the phase voltage testing circuit of the utility model three-phase three-wire system electrical network.As shown in Figure 2, the phase voltage testing circuit of three-phase three-wire system electrical network of the present utility model, this phase voltage testing circuit comprises three groups of resistance, every group of resistance is in series mutually by the identical resistance of a plurality of resistances, and the quantity of every group of resistance equates; Every group all-in resistance also is identical like this.
Every group of resistance has one first end and one second end, each first end of organizing resistance respectively with three-way being connected of A, B, C of three-phase three-wire system electrical network, second end of every group of resistance interconnects and ground connection, as ground wire;
In every group of resistance, close on the electric capacity of a resistance low capacity in parallel of second end (ground wire) most, be used to export filtering.
In a best embodiment, each organizes all-in resistance greater than 5 megohms.
This novel cardinal principle is the constructing virtual zero potential, therefore can save the isolation link of high pressure, low pressure.Under the perfect condition, the time domain expression formula of three-phase phase voltage is:
A＝Usin(ωt-120°)
B＝Usin(ωt)
C＝Usin(ωt+120°)
A+B+C ≡ 0 as can be known
If with three-phase phase voltage receive that three groups of resistances are identical, on the resistance of star-like connection, establishing central point voltage is V, according to the node current law:
(A-V)/R+(B-V)/R＝(V-C)/R
Derive: V=(A+B+C)/3
In conjunction with aforementioned conclusion V ≡ 0 as can be known
Therefore,, produced perseverance and be 0 current potential at the central point of star-like connection, promptly virtual zero line, and be safe, therefore need not to isolate.Again the ground wire of low-pressure side is put therewith continuously, and detected the partial pressure value of resistance, can obtain characterizing the value of three-phase phase voltage.
This circuit has adopted the thinking of said method, isolates with big resistance, and detects phase voltage by dividing potential drop, when guaranteeing safety, has reduced cost.
Above-described just preferred embodiment of the utility model, but be not limited in this in the practice, and the circuit that any employing the utility model is identical carries out the design that three-phase voltage is measured, and all should be included within the protection domain of the present utility model.
Claims (2)
1, a kind of phase voltage testing circuit of three-phase three-wire system electrical network is characterized in that, this phase voltage testing circuit comprises:
Three groups of resistance, every group of resistance is in series mutually by the identical resistance of a plurality of resistances, and the quantity of every group of resistance equates;
Every group of resistance has one first end and one second end, and each first end of organizing resistance is connected with the three-way of three-phase three-wire system electrical network respectively, each second end of organizing resistance ground connection that interconnects;
Close on most a resistance electric capacity in parallel of second end in every group of resistance, be used to export filtering.
2, the phase voltage testing circuit of three-phase three-wire system electrical network according to claim 1 is characterized in that: the described all-in resistance of respectively organizing is greater than 5 megohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201088556U CN201237618Y (en) | 2008-06-26 | 2008-06-26 | Phase voltage detection circuit for three-phase three-wire system electric network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201088556U CN201237618Y (en) | 2008-06-26 | 2008-06-26 | Phase voltage detection circuit for three-phase three-wire system electric network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201237618Y true CN201237618Y (en) | 2009-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201088556U Expired - Fee Related CN201237618Y (en) | 2008-06-26 | 2008-06-26 | Phase voltage detection circuit for three-phase three-wire system electric network |
Country Status (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788597A (en) * | 2010-03-29 | 2010-07-28 | 福建师范大学 | Three-phase three-wire system phase voltage measuring method |
| CN102779395A (en) * | 2012-08-22 | 2012-11-14 | 深圳市豪恩安全科技有限公司 | Mutual-positioning anti-lost device |
| CN105334370A (en) * | 2015-10-22 | 2016-02-17 | 南京亚派科技股份有限公司 | Power grid voltage detection circuit |
| CN108323185A (en) * | 2017-03-25 | 2018-07-24 | 深圳欣锐科技股份有限公司 | A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit |
| CN111398670A (en) * | 2020-04-20 | 2020-07-10 | 南通三本电子有限公司 | Three-phase three-wire voltage and current signal acquisition circuit |
-
2008
- 2008-06-26 CN CNU2008201088556U patent/CN201237618Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788597A (en) * | 2010-03-29 | 2010-07-28 | 福建师范大学 | Three-phase three-wire system phase voltage measuring method |
| CN101788597B (en) * | 2010-03-29 | 2011-08-24 | 福建师范大学 | Three-phase three-wire system phase voltage measuring method |
| CN102779395A (en) * | 2012-08-22 | 2012-11-14 | 深圳市豪恩安全科技有限公司 | Mutual-positioning anti-lost device |
| CN102779395B (en) * | 2012-08-22 | 2014-09-24 | 深圳市豪恩安全科技有限公司 | Mutual-positioning anti-lost device |
| CN105334370A (en) * | 2015-10-22 | 2016-02-17 | 南京亚派科技股份有限公司 | Power grid voltage detection circuit |
| CN108323185A (en) * | 2017-03-25 | 2018-07-24 | 深圳欣锐科技股份有限公司 | A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit |
| CN108323185B (en) * | 2017-03-25 | 2020-09-15 | 深圳欣锐科技股份有限公司 | Input voltage signal sampling circuit in three-phase three-wire system PFC circuit |
| CN111398670A (en) * | 2020-04-20 | 2020-07-10 | 南通三本电子有限公司 | Three-phase three-wire voltage and current signal acquisition circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shidai Corp. Group Assignor: Time Xinjiyuan Technology Group Co., Ltd. Contract fulfillment period: 2009.6.3 to 2014.6.2 Contract record no.: 2009990000613 Denomination of utility model: Phase voltage detection circuit for three-phase three-wire system electric network Granted publication date: 20090513 License type: Exclusive license Record date: 20090605 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.6.3 TO 2014.6.2; CHANGE OF CONTRACT Name of requester: SHIDAI GROUP CO. Effective date: 20090605 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20160626 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |