CN106093580A - A kind of transformator directly hinders measurement quick discharging circuit - Google Patents
A kind of transformator directly hinders measurement quick discharging circuit Download PDFInfo
- Publication number
- CN106093580A CN106093580A CN201610427331.2A CN201610427331A CN106093580A CN 106093580 A CN106093580 A CN 106093580A CN 201610427331 A CN201610427331 A CN 201610427331A CN 106093580 A CN106093580 A CN 106093580A
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- resistance
- effect transistor
- field effect
- transformator
- diode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to a kind of transformator and directly hinder measurement quick discharging circuit, it is connected by diode D1, resistance R1 ~ R3, field effect transistor Q1 and Zener diode W1 and forms.Present configuration design is simple, rationally, use reliable, adapt to the needs of different test parameter, electric discharge equivalent resistance can be improved rapidly and realize quickly consuming transformer core stored energy, adaptive circuit is automatically adjusted in discharge process, it is not necessary to manual control, simultaneously circuit reverse high impedance when test, do not affect test data, measurement error will not be introduced.
Description
Technical field
The invention belongs to technical field of electric power detection, be specifically related to a kind of transformator and directly hinder measurement quick discharging circuit.
Background technology
Winding in Power Transformer resistance is the important parameter of transformator, the test of transformator semi-finished product, delivery test and scene
Diagnosis is required to carry out this and measures.
Owing to Transformer Winding is a inductance the biggest, in order to measure accurate resistance value, it is necessary to apply certain electricity
Stream.Therefore the electric current being applied on winding during measuring, will produce magnetic field in transformer core, and electric energy translates into
Magnetic energy is stored in the core.Drop test power outage at the end of measuring, the magnetic field energy in iron core will be with anti-electricity
The form of gesture discharges, and produces counterattack voltage, and counter voltage size and output loading meet Ohm's law.If directly disconnecting negative
Carrying resistance and be equivalent to infinite resistance, its output back-emf is theoretically infinity, it will have the biggest counter voltage to occur, gently
Then damage instrument and equipment, heavy then jeopardize personal security.
As shown in Figures 2 and 3, common way measured by general transformator is at a test output terminal resistance in parallel, in order to
Not affecting test data, one diode of differential concatenation on resistance, measurement is that diode cut-off is not turned on, when back-pressure occurs
Time, reverse-conducting, the energy in transformer core is discharged, is dissipated on resistance.In order to reduce reverse output voltage, put
Electricity resistance value is less, but its dissipated power under certain electric current is the least, and therefore discharge process is slower；Resistance value is bigger simultaneously
Time back-emf increase, there is danger, when value is relatively low, discharge time long is unsuitable for job demand.As shown in Figure 4, original electric discharge
Circuit is in series with resistance R1 by a diode D1.
Summary of the invention
For the problems referred to above, it is simple, reasonable that the present invention proposes a kind of structure design, uses reliable, adapts to different survey
The needs of examination parameter, circuit self adaptation need not manual control, and high impedance will not produce the transformator of impact and directly hinder survey test
Amount quick discharging circuit.
Technical scheme is as follows:
Above-mentioned transformator directly hinders measurement quick discharging circuit, and it is by diode D1, resistance R1 ~ R3, field effect transistor Q1 and voltage stabilizing
Diode W1 connects composition；The anode tap of described diode D1 connects the positive pole of described transformator U, and cathode terminal passes through described resistance
R1 connects the drain electrode of described field effect transistor Q1；Described resistance R2 one end is connected to the source electrode of described field effect transistor Q1, and the other end is even
Between meeting described resistance R3 and being connected to the cathode terminal of described resistance R1 and described diode D1 by described resistance R3；Described field
The source ground of effect pipe Q1, the grid of described field effect transistor Q1 is connected to the junction point of described resistance R2 and R3；Described voltage stabilizing
Diode W1 is parallel between grid and the ground of described field effect transistor Q1.
Beneficial effect:
It is simple, reasonable that transformator of the present invention directly hinders measurement quick discharging circuit structure design, uses reliable, uses electronic circuit,
Make self adaptation discharge loop, by regulation resistance R1 and R2, adapt to the needs of different test parameter, electric discharge can be improved rapidly
Equivalent resistance realizes quickly consuming transformer core stored energy, and adaptive circuit is automatically adjusted in discharge process, it is not necessary to
Manual control, circuit reverse high impedance when test, does not affect test data, will not introduce measurement error simultaneously；Meanwhile, use
Resistance R1 and a field effect transistor Q1 series connection, be connected to the grid of field effect transistor Q1, voltage stabilizing two after resistance R2 and R3 series connection dividing potential drop
Pole pipe W1 is parallel between the grid of field effect transistor Q1 and ground, plays clamper protective effect.
Accompanying drawing explanation
Fig. 1 is that transformator of the present invention directly hinders the structural representation measuring quick discharging circuit.
Circuit theory diagrams when Fig. 2 is transformator charging；
Circuit theory diagrams when Fig. 3 is transformer discharge；
Fig. 4 is original transformer discharge circuit theory diagrams.
Detailed description of the invention
As it is shown in figure 1, transformator of the present invention directly hinders measurement quick discharging circuit, its be by diode D1, resistance R1 ~ R3,
Field effect transistor Q1 and Zener diode W1 connect composition.
The positive pole of the anode tap connection transformer U of this diode D1, cathode terminal is connected resistance R1 and is connected by resistance R1
The drain electrode of field effect transistor Q1；This resistance R2 and resistance R3 is serially connected；This resistance R2 one end is connected to the source electrode of field effect transistor Q1,
Between the other end is connected resistance R3 and is connected to the cathode terminal of resistance R1 and diode D1 by resistance R3；This field effect transistor Q1
Source electrode connect transformator U negative pole (), the grid of this field effect transistor Q1 is connected to resistance R2 and the junction point of resistance R3；This voltage stabilizing
Diode W1 be parallel to the grid of this field effect transistor Q1 and transformator U negative pole () between.
Transformator of the present invention directly hinders measurement quick discharging circuit and uses resistance R1 and a field effect transistor Q1 series connection, resistance R2
With the grid being connected to field effect transistor Q1 after R3 series connection dividing potential drop；Zener diode W1 is parallel to grid and the ground of field effect transistor Q1
Between, clamper protective effect can be played.
Transformator of the present invention directly hinders measurement quick discharging circuit at the electric discharge initial stage, and electric current is relatively big, produces relatively on resistance R1
Big pressure drop, voltage is added on field effect transistor Q1 grid make field effect transistor Q1 turn on by resistance R2 and R3 dividing potential drop, and discharge circuit joins
Logical, by resistance R1 dissipation magnetic field energy；After discharge current reduces, on resistance R1, pressure drop reduces, and is divided by resistance R2 and R3
When being pressed onto that on field effect transistor Q1 grid, voltage is not enough to make field effect transistor Q1 saturation conduction, field effect transistor Q1 is operated in amplification region,
The drain electrode of field effect transistor Q1 rises with source voltage, makes resistance R1 increase with field effect transistor Q1 series voltage, reaches balance.At this
Under state, discharge loop voltage stabilization exists:
U electric discharge=U (D1)+U (R2)+UR3)；
Wherein, equal to field effect transistor Q1 cut-in voltage after resistance R2, R3 dividing potential drop, set cut-in voltage 4V, R2=10k, R3=50K,
Then discharge voltage is:
U electric discharge=0.5+5+50/10*5=35.5V；
As discharge current=1A, equivalence discharge resistance=R=U/I=35.5/1=35.5 ohm；
As discharge current=0.1A, equivalence discharge resistance=R=U/I=35.5/0.1=355 ohm；
As discharge current=0.01A, equivalence discharge resistance=R=U/I=35.5/0.01=3550 ohm；
Its electric discharge equivalent resistance can increase sharply, it is achieved the purpose of repid discharge.
Present configuration design is simple, reasonable, uses reliable, adapts to the needs of different test parameter, circuit self adaptation
Need not manual control, high impedance will not produce impact to test.
Claims (1)
1. a transformator directly hinders measurement quick discharging circuit, it is characterised in that: described quick discharging circuit be by diode D1,
Resistance R1 ~ R3, field effect transistor Q1 and Zener diode W1 connect composition；
The anode tap of described diode D1 connects the positive pole of described transformator U, and cathode terminal connects described field by described resistance R1
The drain electrode of effect pipe Q1；Described resistance R2 one end is connected to the source electrode of described field effect transistor Q1, and the other end connects described resistance R3
And be connected to by described resistance R3 between the cathode terminal of described resistance R1 and described diode D1；The source of described field effect transistor Q1
Pole ground connection, the grid of described field effect transistor Q1 is connected to the junction point of described resistance R2 and R3；Described Zener diode W1 is in parallel
Between the grid and ground of described field effect transistor Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610427331.2A CN106093580A (en) | 2016-06-13 | 2016-06-13 | A kind of transformator directly hinders measurement quick discharging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610427331.2A CN106093580A (en) | 2016-06-13 | 2016-06-13 | A kind of transformator directly hinders measurement quick discharging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106093580A true CN106093580A (en) | 2016-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610427331.2A Pending CN106093580A (en) | 2016-06-13 | 2016-06-13 | A kind of transformator directly hinders measurement quick discharging circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939007A (en) * | 2016-06-23 | 2016-09-14 | 国网江苏省电力公司泰州供电公司 | Rapid discharge circuit for measuring DC resistance of transformer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090147426A1 (en) * | 2007-12-05 | 2009-06-11 | Sartorius Ag | Current-limiting circuit with additional current path |
| CN201965164U (en) * | 2010-12-02 | 2011-09-07 | 保定市金源科技有限公司 | Inductance coil discharge circuit |
| CN204517389U (en) * | 2015-03-19 | 2015-07-29 | 北车大连电力牵引研发中心有限公司 | Discharge circuit |
| CN204538688U (en) * | 2015-03-25 | 2015-08-05 | 广州视源电子科技股份有限公司 | Discharge device of large-capacity electrolytic capacitor |
| CN204732865U (en) * | 2015-03-23 | 2015-10-28 | 扬州工业职业技术学院 | Modified model 10kW digital dispatching system transmitter high voltage discharge circuit |
| CN105406454A (en) * | 2014-09-07 | 2016-03-16 | 亚荣源科技（深圳）有限公司 | Discharge circuit |
-
2016
- 2016-06-13 CN CN201610427331.2A patent/CN106093580A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090147426A1 (en) * | 2007-12-05 | 2009-06-11 | Sartorius Ag | Current-limiting circuit with additional current path |
| CN201965164U (en) * | 2010-12-02 | 2011-09-07 | 保定市金源科技有限公司 | Inductance coil discharge circuit |
| CN105406454A (en) * | 2014-09-07 | 2016-03-16 | 亚荣源科技（深圳）有限公司 | Discharge circuit |
| CN204517389U (en) * | 2015-03-19 | 2015-07-29 | 北车大连电力牵引研发中心有限公司 | Discharge circuit |
| CN204732865U (en) * | 2015-03-23 | 2015-10-28 | 扬州工业职业技术学院 | Modified model 10kW digital dispatching system transmitter high voltage discharge circuit |
| CN204538688U (en) * | 2015-03-25 | 2015-08-05 | 广州视源电子科技股份有限公司 | Discharge device of large-capacity electrolytic capacitor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939007A (en) * | 2016-06-23 | 2016-09-14 | 国网江苏省电力公司泰州供电公司 | Rapid discharge circuit for measuring DC resistance of transformer |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161109 |