CN203133146U - Transformer neutral point current measuring device - Google Patents
Transformer neutral point current measuring device Download PDFInfo
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- CN203133146U CN203133146U CN 201320130399 CN201320130399U CN203133146U CN 203133146 U CN203133146 U CN 203133146U CN 201320130399 CN201320130399 CN 201320130399 CN 201320130399 U CN201320130399 U CN 201320130399U CN 203133146 U CN203133146 U CN 203133146U
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- triode
- resistance
- measuring device
- amplifying circuit
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 3
- 230000005355 Hall effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
本实用新型涉及一种变压器中性点电流测量装置，该测量装置与变压器的磁芯连接，所述的测量装置包括霍尔元件、副边补偿线圈、放大电路、三极管Q1、三极管Q2、电源和测量电阻RM，所述的副边补偿线圈缠绕在磁芯上，两端分别与三极管Q1的发射极、测量电阻RM一端连接，所述的霍尔元件设在磁芯的开口处，并与放大电路的输入端连接，所述的放大电路输出端分别与三极管Q1的基极、三极管Q2的基极连接，所述的电源分别与三极管Q1的集电极、三极管Q2的集电极连接，所述的测量电阻RM另一端接地。与现有技术相比，本实用新型具有低温漂，抗干扰能力强，适用于电力接地系统及漏电检测系统等优点。
The utility model relates to a measuring device for neutral point current of a transformer. The measuring device is connected with the magnetic core of the transformer. The measuring device includes a Hall element, a secondary side compensation coil, an amplifying circuit, a triode Q1, a triode Q2, a power supply and Measuring the resistance R M , the secondary side compensation coil is wound on the magnetic core, and the two ends are respectively connected with the emitter of the triode Q1 and one end of the measuring resistance R M , the Hall element is arranged at the opening of the magnetic core, and It is connected with the input end of the amplifying circuit, and the output end of the amplifying circuit is respectively connected with the base of the triode Q1 and the base of the triode Q2, and the described power supply is respectively connected with the collector of the triode Q1 and the collector of the triode Q2. The other end of the measurement resistor R M is grounded. Compared with the prior art, the utility model has the advantages of low temperature drift, strong anti-interference ability, and is suitable for power grounding systems and leakage detection systems.
Description
Technical field
The utility model relates to a kind of transformer measurement mechanism, especially relates to a kind of transformer neutral point current measuring device.
Background technology
The electric current of transformer neutral point is made up of alternating current and DC current, in order to detect this electric current accurately, needs to adopt the Hall current sensor that can detect the AC and DC electric current, and simultaneously, the design parameter of Hall current sensor will satisfy the requirement of detection.
Existing transformer central point current detecting generally adopts the open loop Hall current sensor, the structure of open loop Hall current sensor as shown in Figure 1, as primary current I
PWhen flowing through a long lead, will produce magnetic field around the lead, the size in this magnetic field is directly proportional with the electric current that flows through lead, and the magnetic field of generation accumulates in the magnet ring, measures and amplifies output, its output voltage V by Hall element in the magnet ring air gap
SAccurately reflect primary current I
P, general V
SSpecified output demarcate and be 4V.
The advantage of open loop Hall current sensor is that circuit form is simple, cost is relatively low; Its shortcoming is that precision, the linearity are relatively poor; Response time is slower; Temperature drift is bigger.
The utility model content
The purpose of this utility model is exactly to provide a kind of transformer neutral point current measuring device for the defective that overcomes above-mentioned prior art existence.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of transformer neutral point current measuring device, this measurement mechanism is connected with the magnetic core of transformer, it is characterized in that, and described measurement mechanism comprises Hall element, secondary compensating coil, amplifying circuit, triode Q1, triode Q2, power supply and measuring resistance R
M, described secondary compensating coil is wrapped on the magnetic core, two ends respectively with emitter, the measuring resistance R of triode Q1
MOne end connects, described Hall element is located at the opening part of magnetic core, and be connected with the input end of amplifying circuit, described amplification circuit output end is connected with the base stage of triode Q1, the base stage of triode Q2 respectively, described power supply is connected with the collector of triode Q1, the collector of triode Q2 respectively, described measuring resistance R
MOther end ground connection.
Described amplifying circuit comprises resistance R 1, resistance R 2 and operational amplifier, and described operational amplifier input end is connected with resistance R 1, resistance R 2 respectively.
Compared with prior art, the utlity model has following advantage:
Use the current sensor of new generation of Hall effect and zero magnetic flux principle, can under electrically isolated condition, measure the then electric current of waveform of direct current, interchange, pulse and various accident, utilize closed loop (compensation) current sensor of Hall effect principle, low temperature floats, antijamming capability is strong, is applicable to system and detection of electrical leakage system power ground.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
As shown in Figure 1, a kind of transformer neutral point current measuring device, this measurement mechanism is connected with the magnetic core of transformer, and described measurement mechanism comprises Hall element 1, secondary compensating coil 2, amplifying circuit 3, triode Q1, triode Q2, power supply VC and measuring resistance R
M, described secondary compensating coil 2 is wrapped on the magnetic core 4, two ends respectively with emitter, the measuring resistance R of triode Q1
MOne end connects, described Hall element 1 is located at the opening part of magnetic core 4, and be connected with the input end of amplifying circuit 3, described amplifying circuit 3 output terminals are connected with the base stage of triode Q1, the base stage of triode Q2 respectively, described power supply is connected with the collector of triode Q1, the collector of triode Q2 respectively, described measuring resistance R
MOther end ground connection.
Described amplifying circuit comprises resistance R 1, resistance R 2 and operational amplifier, and described operational amplifier input end is connected with resistance R 1, resistance R 2 respectively.
The concrete course of work is: when major loop has an electric current I
pBy the time, assembled by magnet ring in the magnetic field that lead produces and sense on the hall device, the signal output that produces is used for the driving power pipe and makes its conducting, thereby obtains an offset current I
sThis electric current produces magnetic field, this magnetic field and measured current I by multicircuit winding again
pThe magnetic field that produces is just in time opposite, thereby has compensated original magnetic field, and the output of hall device is reduced gradually.When and I
pMultiply each other the magnetic field that produces when equating, I with the number of turn
sNo longer increase, hall device at this moment plays the effect of indication zero magnetic flux, and can pass through I this moment
sCome test I
pWork as I
pDuring variation, balance is damaged, and hall device has signal output, namely repeats said process and reaches balance again.Any variation of tested electric current all can destroy this balance.In case magnetic field out of trim, hall device just have signal output.After power amplification, just there is corresponding electric current to flow through secondary winding so that unbalance magnetic field is compensated immediately.Unbalance to balance again from magnetic field, less than 1 μ s, this is the process of a mobile equilibrium on the required time theory.
Primary current I
pThe magnetic field that produces is by the electric current I of a secondary coil
sThe magnetic field that produces compensates, and makes hall device be in the duty that detects zero magnetic flux all the time.When the magnetic field that former secondary offset current produces reaches balance in magnetic core:
N
p×I
p＝N
s×I
s
In the formula: N
pThe number of turn for primary coil; I
pBe primary current; N
sThe number of turn for secondary coil; I
sBe the secondary offset current.
Claims (2)
1. transformer neutral point current measuring device, this measurement mechanism is connected with the magnetic core of transformer, it is characterized in that, and described measurement mechanism comprises Hall element, secondary compensating coil, amplifying circuit, triode Q1, triode Q2, power supply and measuring resistance R
M, described secondary compensating coil is wrapped on the magnetic core, two ends respectively with emitter, the measuring resistance R of triode Q1
MOne end connects, described Hall element is located at the opening part of magnetic core, and be connected with the input end of amplifying circuit, described amplification circuit output end is connected with the base stage of triode Q1, the base stage of triode Q2 respectively, described power supply is connected with the collector of triode Q1, the collector of triode Q2 respectively, described measuring resistance R
MOther end ground connection.
2. a kind of transformer neutral point current measuring device according to claim 1 is characterized in that described amplifying circuit comprises resistance R 1, resistance R 2 and operational amplifier, and described operational amplifier input end is connected with resistance R 1, resistance R 2 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320130399 CN203133146U (en) | 2013-03-21 | 2013-03-21 | Transformer neutral point current measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320130399 CN203133146U (en) | 2013-03-21 | 2013-03-21 | Transformer neutral point current measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203133146U true CN203133146U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320130399 Expired - Lifetime CN203133146U (en) | 2013-03-21 | 2013-03-21 | Transformer neutral point current measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203133146U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995177A (en) * | 2014-04-22 | 2014-08-20 | 国家电网公司 | Power transformer neutral point direct current measurement and wave-recording device and detection method |
| CN104113046A (en) * | 2014-06-30 | 2014-10-22 | 国家电网公司 | Intermittent starting device of circuit breaker coil |
| CN105298382A (en) * | 2014-06-28 | 2016-02-03 | 湖南泰达天易重工有限公司 | Drill burying preventing method of long twist drill |
| CN105807117A (en) * | 2014-12-29 | 2016-07-27 | 苏州普源精电科技有限公司 | Current sensing circuit for current measuring probe and current measuring probe |
| CN108267621A (en) * | 2018-03-22 | 2018-07-10 | 广东电网有限责任公司清远供电局 | A kind of jaw type current measurer based on Hall element |
| CN108448604A (en) * | 2017-02-16 | 2018-08-24 | 全球能源互联网研究院 | A grounding device for a flexible direct current transmission system |
| WO2021208135A1 (en) * | 2020-04-13 | 2021-10-21 | 深圳市知用电子有限公司 | Closed-loop current transformer |
| CN115389807A (en) * | 2022-10-27 | 2022-11-25 | 国网江西省电力有限公司电力科学研究院 | A Transformer Neutral Point DC Current Sensor Based on Fluxgate |
-
2013
- 2013-03-21 CN CN 201320130399 patent/CN203133146U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995177A (en) * | 2014-04-22 | 2014-08-20 | 国家电网公司 | Power transformer neutral point direct current measurement and wave-recording device and detection method |
| CN103995177B (en) * | 2014-04-22 | 2016-06-08 | 国家电网公司 | The measurement of power transformer neutral point direct current and wave recording device and detection method |
| CN105298382A (en) * | 2014-06-28 | 2016-02-03 | 湖南泰达天易重工有限公司 | Drill burying preventing method of long twist drill |
| CN104113046A (en) * | 2014-06-30 | 2014-10-22 | 国家电网公司 | Intermittent starting device of circuit breaker coil |
| CN105807117A (en) * | 2014-12-29 | 2016-07-27 | 苏州普源精电科技有限公司 | Current sensing circuit for current measuring probe and current measuring probe |
| CN105807117B (en) * | 2014-12-29 | 2020-01-31 | 苏州普源精电科技有限公司 | Current sensing circuit for current measuring probe and current measuring probe thereof |
| CN108448604A (en) * | 2017-02-16 | 2018-08-24 | 全球能源互联网研究院 | A grounding device for a flexible direct current transmission system |
| CN108448604B (en) * | 2017-02-16 | 2021-10-29 | 全球能源互联网研究院 | A grounding device for a flexible direct current transmission system |
| CN108267621A (en) * | 2018-03-22 | 2018-07-10 | 广东电网有限责任公司清远供电局 | A kind of jaw type current measurer based on Hall element |
| WO2021208135A1 (en) * | 2020-04-13 | 2021-10-21 | 深圳市知用电子有限公司 | Closed-loop current transformer |
| US12013417B2 (en) | 2020-04-13 | 2024-06-18 | Shenzhen Zhiyong Electronics Co., Ltd. | Closed loop current transformer |
| CN115389807A (en) * | 2022-10-27 | 2022-11-25 | 国网江西省电力有限公司电力科学研究院 | A Transformer Neutral Point DC Current Sensor Based on Fluxgate |
| CN115389807B (en) * | 2022-10-27 | 2023-03-24 | 国网江西省电力有限公司电力科学研究院 | A Transformer Neutral Point DC Current Sensor Based on Fluxgate |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |