CN209148758U - A kind of phase sequence zero sequence integration voltage sensor - Google Patents
A kind of phase sequence zero sequence integration voltage sensor Download PDFInfo
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- CN209148758U CN209148758U CN201821799656.4U CN201821799656U CN209148758U CN 209148758 U CN209148758 U CN 209148758U CN 201821799656 U CN201821799656 U CN 201821799656U CN 209148758 U CN209148758 U CN 209148758U
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- 238000000819 phase cycle Methods 0.000 title claims abstract description 38
- 230000010354 integration Effects 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 40
- 238000004804 winding Methods 0.000 claims abstract description 11
- 239000010409 thin film Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000003985 ceramic capacitor Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims 1
- 238000002955 isolation Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 230000006837 decompression Effects 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
A kind of phase sequence zero sequence integration voltage sensor provided by the utility model, belongs to high tension voltage field of measuring technique.The transformer of a primary side and two secondary sides is had including three high voltage arm capacitors, three low-voltage arm capacitors and three；The connection relationship of each device are as follows: three-phase voltage is respectively grounded after a high voltage arm capacitor is connected with a low-voltage arm capacitor；The primary side of each transformer is connected to a low-voltage arm capacitor both ends, the secondary side open circuit of the first of each transformer exports winding as phase sequence voltage signal, the secondary side of the second of each transformer forms open-delta after successively different name end joins end to end two-by-two by ABC phase sequence sequence, exports winding as residual voltage.The utility model solves shared one group of ABC three-phase high-voltage arm capacity cell partial pressure while obtaining 3 phase sequence voltage signals and 1 residual voltage signal exports and signal transformer isolation had not only guaranteed signal accuracy but also had been able to achieve the electic protection to secondary device.
Description
Technical field
The utility model relates to a kind of phase sequence zero sequence integration voltage sensors, belong to high tension voltage field of measuring technique.
Background technique
Distribution terminal needs accurate primary side voltage measurement signal to carry out the judgement of line fault, and then realizes switch
Cut-off control and power distribution automation.In the distribution network system of isolated neutral, residual voltage signal is used as line-to-ground event
The judgement for hindering direction, as source side or load side are sentenced if can obtain phase sequence voltage signal simultaneously can realize Fault Phase Selection for failure
Further foundation is provided surely, and then reduces the difficulty of route O&M, improves power supply reliability.
Conventional electromagnetic mutual inductor is by sharing a three-phase five-limb iron core, then coiling three-phase phase-sequence and zero sequence respectively
The measurement winding of voltage, so realize phase sequence residual voltage while measure, but due to bulky, insulating process it is complicated so that
Such product cost is high, qualification rate is low, and at the same time, there is also conventional electromagnetic voltage transformers to be easy to happen for the technical solution
Risk and route the large area installation that ferromagnetic resonance causes equipment to be damaged are easy to increase perception using electromagnetic potential transformer
Reactive loss causes power quality to decline and generate the technological deficiency of bigger line loss.
Utility model content
The purpose of the utility model is to overcome the shortcomings of prior art, provide a kind of phase sequence zero sequence integration voltage
Sensor, which high-precision can export phase sequence and residual voltage signal simultaneously, and effectively carry out to secondary side circuit
Electric insulation isolation, to protect secondary side apparatus and Switch main body operation power from the damage of failure remaining high pressure.
To achieve the above object, the utility model uses following technical scheme:
A kind of phase sequence zero sequence integration voltage sensor, which is characterized in that including three high voltage arm capacitors, three low-voltage arms
The transformer with a primary side and two secondary sides of capacitor and three；The connection relationship of each device are as follows: three-phase voltage is respectively
It is grounded after a high voltage arm capacitor is connected with a low-voltage arm capacitor；The primary side of each transformer is connected to
One low-voltage arm capacitor both ends, the secondary side open circuit of the first of each transformer export winding, each transformation as phase sequence voltage signal
The secondary side of the second of device forms open-delta after successively different name end joins end to end two-by-two by A, B, C phase sequence sequence, as zero sequence electricity
Pressure output winding.
The characteristics of the utility model and beneficial effect are:
The principle that the utility model is once divided based on high-voltage capacitance and low-voltage capacitance and transformer secondary divide again is real
Phase sequence residual voltage signal is now exported simultaneously, and the phase sequence zero sequence integration voltage mutual inductor of realization can realize primary side breakdown insulation
Under failure, the electric insulation between primary side and secondary side is isolated, and effective protection secondary device and Switch main body operation power are exempted from
By the damage of failure remaining high pressure.
(1) phase sequence and residual voltage, which divide, shares one group of high voltage arm capacitor
ABC three-phase circuit respectively passes through a high voltage arm capacitor and forms partial pressure relationship with the secondary derided capacitors of connecting of each phase,
The signal exported from second divided voltage capacitance terminal is shared the transformer that two secondary sides of a primary side export again, forms two paths of signals
Output, wherein signal is directly used as phase sequence voltage all the way, another is used as residual voltage output after being connected into open-delta, should
Mode is only connected with secondary capacitor than tradition and divides while obtaining the mode of phase sequence and residual voltage signal, saves ABC three-phase
One group of high voltage arm capacitor, and then directly reduce 3 high-tension apparatus grounding points that multi-purpose one group of high voltage arm capacitor has more, Yi Jizhi
The ground connection risk after reducing thus bring breakdown is connect, improves power supply reliability indirectly.
(2) signal isolation transformer realizes the electic protection to secondary device
After any one phase capacitive divider of ABC three-phase is breakdown, line-to-ground is formd immediately, and grounding point is remaining at this time
Voltage is about there are also one kilovolt or more, if original signal circuit without being dielectrically separated from, directly return from signal by residual high pressure at this time
Road enters, and directly takes operation power in electric Switch main body that will be damaged by residual high pressure by secondary device and out of secondary device
It ruins, until whole switchgears are thoroughly damaged.Based on this risk, by the signal path of transformer isolation, due to transformer
Insulation itself is horizontal higher than failure residual voltage, itself breakdown will not be damaged, while transformer is isolated using large velocity ratio decompression,
When failure residual voltage is applied to transformer primary side, the voltage of secondary side output is not more than the resistance to voltage levels of secondary device,
Thus do not influence signal accuracy when the transformer plays operation work, when first breakdown failure again can itself dielectric level height not
It is destroyed, and the multiple action that energy large velocity ratio decompression protects secondary device not damaged by residual high pressure.
(3) phase sequence residual voltage signal is exported simultaneously
The utility model can export phase sequence residual voltage signal using a set of pieces simultaneously, can reduce cost, Technological Economy
Property is good；Data supporting can be also provided for the more powerful protection for feed line of development function, i.e., determined in original earthing fault direction
On the basis of, increase ground fault phase selection and determines.
Detailed description of the invention
Fig. 1 is a kind of electronic schematic diagram of phase sequence zero sequence integration voltage sensor of the utility model embodiment.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is described further technical solutions of the utility model.
As shown in Figure 1, the phase sequence zero sequence integration voltage sensor of the utility model includes three high voltage arm capacitors 1, three
A low-voltage arm capacitor 2, three transformers 3 with a primary side (for input terminal) and two secondary sides (for output end)；Each device
Connection relationship are as follows: A, B, C three-phase voltage are respectively after a high voltage arm capacitor 1 is connected with a low-voltage arm capacitor 2 respectively
Ground connection, high voltage arm capacitor form partial pressure relationship of connecting with low-voltage arm capacitor；The primary side of each transformer 3 is connected to a low pressure
2 both ends of arm capacitor, the secondary side of the first of each transformer 3, which is opened a way, is used as phase sequence voltage signal output winding 4, and the second of each transformer 3
Secondary side forms open-delta after successively different name end joins end to end two-by-two by A, B, C phase sequence sequence, as residual voltage output around
Group 5.
Each synthesizer part is the conventional products of the art in the utility model embodiment.Wherein, secondary point is participated in
The transformer of pressure is step-down transformer, and decompression no-load voltage ratio is 8:1 or more, realizes the large velocity ratio drop to failure residual high pressure with this
Pressure, and then realize the protection to back-end circuit and electrical equipment.
The working principle of the present embodiment is as follows: operation is in use, apply operating voltage on three high voltage arm capacitor C1, just
Can three with a primary side and two it is secondary while transformer 3 in respective first it is secondary while open a way output phase sequence voltage signal,
Second secondary side is connected into open-delta for exporting residual voltage signal, i.e., is realized by high voltage arm capacitor after once dividing, low
Pressure arm capacitor and transformer realize second divided voltage jointly again, and then measure secondary device phase sequence and residual voltage signal simultaneously.
At the same time, the transformer 3 of three participation second divided voltages is step-down transformer, and decompression no-load voltage ratio is 8:1 or more, has tolerance
The insulating capacity of failure residual high pressure, to guarantee itself not punctured by failure residual high pressure when failure occurs.Three transformers 3
Electric insulation isolation is formd by being dielectrically separated between a secondary winding, it is (general big further through the large velocity ratio of three transformers 3
In 8:1) decompression relationship forms the decompression protection of failure residual high pressure, and then realizes the guarantor to back-end circuit and electrical equipment
Shield.
The present embodiment validation verification:
A rated operational voltage is obtained according to above-mentioned connection relationshipSpecified phase sequence output
The phase sequence zero sequence integration voltage sensor of specified zero sequence output 6.5/3, three high voltage arm capacitors 1 of the voltage sensor use
Low Drift Temperature, low-loss higfh-tension ceramics capacitor (in addition, high voltage thin film capacitor or other high-voltage capacitances also may be selected), capacitance C1
For 240pF, three low-voltage arm capacitors 2 are equally using Low Drift Temperature, low-loss low pressure ceramic capacitor (in addition, also may be selected low pressure
Thin-film electro perhaps other low-voltage capacitances), capacitance C2 is 73.6nF, three transformers 3 with a primary side and two secondary sides
Using low-loss, the alloy core coiling of high magnetic permeability, the turn ratio on primary side and two secondary sides is set as 2000:200, and one or two times
Using the wrapping isolation of high voltage bearing polyester film between winding, the 2000V of resistance to voltage levels is designed.Add respectively from three high voltage arm capacitors 1
Enter ABC three-phase operating voltageFor phase sequence voltage signal output 4 the every phase output voltage of ABC three-phase be respectively
(Ua+, Ua-, Ub+, Ub-, Uc+, Uc- respectively represent corresponding phase phase sequence voltage in Fig. 1 by 1.87615V, 1.87611V, 1.87620V
Anode, negative signal output end), the output voltage for residual voltage output winding 5 is 2.16535V (U0+, U0- points in Fig. 1
Zero sequence anode, negative signal output end are not represented), signal accuracy reaches 0.2%.
To sum up, it is high to solve shared one group of ABC three-phase for a kind of phase sequence zero sequence integration voltage sensor of the utility model
Pressure arm capacity cell divides while obtaining three phase sequence voltage signals and a residual voltage signal output and signal transformation
Device isolation had not only guaranteed signal accuracy but also had been able to achieve the electic protection to secondary device.Meanwhile the voltage sensor is suitable for distribution
In equipment one or two times fusions, and it is provided simultaneously with failure and selects into the protection for feed line of new generation with phase-selecting function.This voltage sensor
The Technical Economy of device is good, has excellent performance, and can provide the technical support of depth integration for controller switching equipment one or two times fusions, while
High-quality data supporting, therefore, this kind can be provided for performance and the more powerful feeder automation protection of function and line loss metering
Voltage transformer has a good application prospect.
Claims (2)
1. a kind of phase sequence zero sequence integration voltage sensor, which is characterized in that including three high voltage arm capacitors, three low-voltage arm electricity
Hold and three transformers with the secondary sides of a primary side and two；The connection relationship of each device are as follows: three-phase voltage respectively passes through
It crosses after the high voltage arm capacitor is connected with a low-voltage arm capacitor and is grounded；The primary side of each transformer is connected to one
A low-voltage arm capacitor both ends, the secondary side open circuit of the first of each transformer export winding, each transformer as phase sequence voltage signal
The second secondary side form open-delta after successively different name end joins end to end two-by-two by A, B, C phase sequence sequence, as residual voltage
Export winding.
2. phase sequence zero sequence integration voltage sensor as described in claim 1, which is characterized in that the high voltage arm capacitor is selected
Higfh-tension ceramics capacitor or high voltage thin film capacitor；The low-voltage arm capacitor selects low pressure ceramic capacitor or low-pressure membrane capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821799656.4U CN209148758U (en) | 2018-11-02 | 2018-11-02 | A kind of phase sequence zero sequence integration voltage sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821799656.4U CN209148758U (en) | 2018-11-02 | 2018-11-02 | A kind of phase sequence zero sequence integration voltage sensor |
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| CN209148758U true CN209148758U (en) | 2019-07-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188057A (en) * | 2018-11-02 | 2019-01-11 | 中国矿业大学(北京) | A kind of phase sequence zero sequence integration voltage sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188057A (en) * | 2018-11-02 | 2019-01-11 | 中国矿业大学(北京) | A kind of phase sequence zero sequence integration voltage sensor |
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Granted publication date: 20190723 |