CN108490239B - Transient current measuring device - Google Patents
Transient current measuring device Download PDFInfo
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- CN108490239B CN108490239B CN201810216878.7A CN201810216878A CN108490239B CN 108490239 B CN108490239 B CN 108490239B CN 201810216878 A CN201810216878 A CN 201810216878A CN 108490239 B CN108490239 B CN 108490239B
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- 230000001052 transient effect Effects 0.000 title claims abstract description 27
- 238000004804 winding Methods 0.000 claims abstract description 115
- 238000001514 detection method Methods 0.000 claims abstract description 100
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 230000000737 periodic effect Effects 0.000 abstract description 16
- 210000001503 joint Anatomy 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a transient current measuring device which comprises a sensing head, an exciting transformer, a butt-joint electrolytic capacitor, a coupling capacitor, a standard resistor, an alternating current voltage amplifier, an alternating current power amplifier, a direct current voltage amplifier, a direct current filter demodulator, a total adder and a direct current power amplifier, wherein a detection iron core coil of the sensing head comprises a first annular detection iron core, a second annular detection iron core, a third annular detection iron core and a fourth annular detection iron core, and a first detection winding, a second detection winding, a third detection winding and a fourth detection winding. The first detection winding, the second detection winding, the exciting transformer, the direct-current voltage amplifier, the direct-current filter demodulator, the total adder and the direct-current power amplifier form an aperiodic component detection circuit, the secondary aperiodic component direct-current is output, the third detection winding, the fourth detection winding, the alternating-current voltage amplifier and the alternating-current power amplifier form a periodic component detection circuit, the secondary alternating-current compensation current is output, the secondary winding, the butt-joint electrolytic capacitor and the standard resistor form a secondary alternating-current mutual inductance loop, the secondary magnetic potential balance current is output, and transient current measurement is realized.
Description
Technical Field
The invention belongs to current measurement equipment in the electrotechnical field, and particularly relates to a device for measuring transient current in a power system.
Background
The application of the novel AC/DC comparator in transient current measurement is disclosed in the 29 th volume of the 2001 university of science and technology journal in China, which combines a self-balancing DC comparator with an electronic compensation type AC current transformer to measure AC periodic components and attenuated DC non-periodic components in transient current, solves the problems that the iron core of the transient current transformer is easy to saturate and causes serious distortion of secondary side current waveforms due to the DC components, and has novelty. But has the following drawbacks: a pair of annular iron cores C 2 And C 3 The outside is respectively wound with a detection coil N with the same number of turns and the same name end and the same phase connection E1 And N E2 The detection voltage is not only the test signal of the self-balancing direct current comparator, but also the detection signal of the electronic compensation type alternating current transformer, so that the attenuated direct current non-periodic component has great significance for relieving the core saturation because of fast attenuation, is easily covered by the alternating current periodic component, and has limited effect, thus the invention aims to solve the problem.
Disclosure of Invention
The invention provides a transient current measuring device which solves the problem that the core saturation of a transient current transformer in the prior art is strictly eliminated, and is used for measuring transient current by a superior and perfect structure.
In order to achieve the above object, the present invention provides a transient current measurement apparatus comprising:
the device comprises a sensing head, an exciting transformer, a butt joint electrolytic capacitor, a coupling capacitor, a standard resistor, an alternating current voltage amplifier, an alternating current power amplifier, a direct current voltage amplifier, a direct current filter demodulator, a total adder and a direct current power amplifier;
the sensing head comprises a third annular detection iron core, a second annular detection iron core, a first annular detection iron core and a fourth annular detection iron core which are coaxially arranged in sequence from left to right; the sensing head further comprises a first detection winding wound on the first annular detection iron core, a second detection winding wound on the second annular detection iron core, a third detection winding wound on the third annular detection iron core and a fourth detection winding wound on the fourth annular detection iron core; the sensing head further comprises a first electrostatic shielding layer coated outside the second detection winding and the first detection winding, a second electrostatic shielding layer coated outside the third detection winding and a third electrostatic shielding layer coated outside the fourth detection winding; the sensing head further comprises a magnetic shielding iron core arranged outside the first electrostatic shielding layer to the third electrostatic shielding layer; the sensing head also comprises a secondary winding wound outside the magnetic shielding iron core and a fourth electrostatic shielding layer positioned outside the secondary winding;
the different name end of the first detection winding is connected with the different name end of the second detection winding; the first detection winding is connected in parallel with a first secondary winding of the excitation transformer through a resistor, the homonymous end of the first detection winding is grounded, the homonymous end of the first secondary winding of the excitation transformer is connected with the input end of the direct-current voltage amplifier, the output end of the direct-current voltage amplifier is connected to one input end of the total adder, the output end of the total adder is connected with the input end of the direct-current power amplifier, and the output end of the direct-current power amplifier is connected with the heteronymous end of the secondary winding; the second detection winding is connected in parallel with a second secondary winding of the excitation transformer through a resistor, the homonymous end of the second detection winding is simultaneously connected with the input end of the direct current filter demodulator, and the output end of the direct current filter demodulator is connected with the other input end of the total adder;
the different name end of the third detection winding is connected with the same name end of the fourth detection winding, the different name end of the fourth detection winding is grounded, the same name end of the third detection winding is connected with the input end of an alternating current voltage amplifier, the output end of the alternating current voltage amplifier is connected with the input end of the alternating current power amplifier, the output end of the alternating current power amplifier is connected with one end of a coupling capacitor, and the other end of the coupling capacitor is connected with the different name end of the secondary winding; the synonym end of the secondary winding is grounded through a butt joint electrolytic capacitor, and the synonym end of the secondary winding is grounded through a standard resistor.
Preferably, the materials of the first electrostatic shielding layer to the fourth electrostatic shielding layer are copper foils.
Preferably, the magnetic shielding iron core is formed by winding cold-rolled silicon steel into a ring shape and assembling after annealing treatment.
Preferably, the first annular detection iron core and the fourth annular detection iron core have the same shape, and are obtained by winding cold-rolled silicon steel into a ring shape and annealing.
Preferably, the number of turns of the first detection winding, the number of turns of the second detection winding, the number of turns of the third detection winding, and the number of turns of the fourth detection winding are the same.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
the invention realizes the independent signal detection system of the alternating current periodic component and the attenuated direct current non-periodic component in the transient current, and the signals are not mutually contained and influenced; in order to ensure the detection of the direct current non-periodic component signals playing a key role, a direct current detection iron core based on the combination of magnetic modulation and a magnetic amplifier is arranged at the center position of a sensing head, two alternating current detection iron cores are arranged at two sides, and the two alternating current detection iron cores not only play the role of detecting alternating current signals, but also play the role of magnetic shielding of the two direct current detection iron cores.
Drawings
FIG. 1 is a diagram showing the appearance of a sensor head of a transient current measurement device according to the present invention;
FIG. 2 is a cross-sectional view of a sensor head of the transient current measurement device according to the present invention;
fig. 3 is a circuit diagram of the transient current measuring device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
FIG. 1 is a diagram showing the appearance of a sensor head of a transient current measuring device, and the section of the sensor head is shown in FIG. 2; first annular detecting iron core C with same shape 1 Second annular detecting iron core C 2 Third annular detecting iron core C 3 And fourth annular detecting core C 4 Respectively wound with first detection windings W with the same number of turns D1 Second detection winding W D2 Third detection winding W D3 And a fourth detection winding W D4 The method comprises the steps of carrying out a first treatment on the surface of the First detection winding W D1 And a second detection winding W D2 The assembled outer surface is wound with a first electrostatic shielding copper foil E 1 The method comprises the steps of carrying out a first treatment on the surface of the Third detection winding W D3 And a fourth detection winding W D4 The outer surfaces are respectively wound with a second electrostatic shielding copper foil E 2 And a second electrostatic shielding copper foil E 3 According to the first detection winding W D1 Is a first annular detecting core C 1 Wound with a second detection winding W D2 Second toroidal core C of (2) 2 Centered, wound with a third detection winding W D3 Third toroidal core C 3 Around which is wound a fourth detecting winding W D4 Fourth toroidal core C 4 The two sides of each potential are assembled, the whole body is arranged in an annular half cavity of a magnetic shielding iron core C, and a secondary winding W is wound outside the magnetic shielding iron core C 2 Secondary winding W 2 The outside is covered with a fourth electrostatic copper shielding layer E 4 . The primary winding W shown in FIG. 3 1 I.e. to transmit the measured transient current I 1 From the center of the sensor head as shown in FIG. 1The round hole passes through. The magnetic shielding iron core C is formed by winding a strip-shaped cold-rolled silicon steel strip into a ring shape after annealing treatment and assembling the strip-shaped cold-rolled silicon steel strip into a ring shape with a half cavity inside. First annular detecting iron core C 1 Second annular detecting iron core C 2 Third annular detecting iron core C 3 And fourth annular detecting core C 4 Is formed by annealing and winding a strip-shaped cold-rolled silicon steel sheet.
Fig. 3 shows a circuit diagram of a transient current measuring device. A transient current measuring device comprises a sensing head, an exciting transformer, a resistor, a butt-joint electrolytic capacitor, a coupling capacitor, a standard resistor, an alternating current voltage amplifier, an alternating current power amplifier, a direct current voltage amplifier, a direct current filter demodulator, a total adder and a direct current power amplifier.
Secondary winding W in sensor head T 2 Is connected with a standard resistor R in series at the same name end S Rear ground, secondary winding W 2 The opposite terminal of the butt joint electrolytic capacitor 1 is connected with one end of the butt joint electrolytic capacitor 1, and the other end of the butt joint electrolytic capacitor 1 is grounded; first detection winding W D1 Is grounded and then is simultaneously connected with a first resistor R 1 Is a first resistor R 1 The other end of the transformer is connected with an exciting transformer T 1 Is a first secondary winding W T1 Is the same-name end of the first detection winding W D1 Is simultaneously connected with an exciting transformer T at the different name end 1 Is a first secondary winding W T1 Is a synonym for the second detection winding W D2 Is the synonym end of the second detection winding W D2 Different name terminal and exciting transformer T 1 Is a second secondary winding W T2 Is connected with the same name end of the second detection winding W D2 Is connected with a second resistor R 2 One end of the second resistor R 2 The other end of (2) and the exciting transformer T 1 Is a second secondary winding W T2 Is connected with the synonym end of the second detection winding W D2 The homonymous terminal is simultaneously connected with the input terminal of the DC filter demodulator 2, and the output terminal of the DC filter demodulator 2 is connected with one input terminal of the total adder 3; exciting transformer T 1 Is a first secondary winding W T1 The homonymous terminal of the DC voltage amplifier 4 is connected with the input terminal of the DC voltage amplifier 4, and the output terminal of the DC voltage amplifier 4 is connected with the total adder3, the output end of the total adder 3 is connected with the input end of the DC power amplifier 5, the output end of the DC power amplifier 5 and the secondary winding W 2 Is connected with the heteronym end of the file; third detection winding W D3 The heteronymous terminal is connected with a fourth detection winding W D4 Is the same-name end of the fourth detection winding W D4 The different name end of (a) is connected with a grounding point, and a third detection winding W D3 The same name end of the capacitor is connected with the input end of the alternating current voltage amplifier 6, the output end of the alternating current voltage amplifier 6 is connected with the input end of the alternating current power amplifier 7, the output end of the alternating current power amplifier 7 is connected with one end of the coupling capacitor 8, and the other end of the coupling capacitor 8 is connected with the secondary winding W 2 Is a heterogeneous end of (a).
After the device is put into operation, the secondary winding W 2 Butt-joint electrolytic capacitor 1 and standard resistor R S The secondary alternating current mutual inductance loop is formed to establish transient current I 1 Secondary magnetic potential balance current I of medium alternating current periodic component 21 This magnetic potential balance is very limited. Through exciting transformer T 1 After excitation, the first annular detection iron core C 1 Second annular detecting iron core C 2 And a first detection winding W D1 Second detection winding W D2 Exciting transformer T 1 A first resistor R 1 And a second resistor R 2 The resulting magnetic modulator detects signal V 1 And magnetic amplifier detection signal V 2 Respectively passing through a DC filter demodulator 2 and a DC voltage amplifier 4, and then entering a total adder 3 for total adding to obtain transient current I 1 The signal output by the total adder 3 outputs a secondary non-periodic component DC current I through a DC power amplifier 5 2D To the secondary winding W 2 The ampere-turn magnetic potential balance of the primary and secondary aperiodic direct current is realized; detecting the iron core C by a third ring 3 Fourth annular detecting iron core C 4 And detecting winding W D3 、W D4 The obtained AC current detection signal is passed through an AC voltage amplifier 6 and an AC power amplifier 7, and then passed through a coupling capacitor 8 to obtain a secondary AC compensation current I 22 。
Secondary magnetic potential balance current I of ac periodic component 21 And secondary AC compensation current I 22 Superposition to obtain secondary periodic component alternating current I 23 The method comprises the steps of carrying out a first treatment on the surface of the Secondary periodic component ac current I 23 And a secondary non-periodic component direct current I 2D Accurately balancing the alternating periodic component and the decaying direct non-periodic component of the primary transient current, i.e. 23 +I 2D )W 2 ＝I 1 W 1 The problem that the transient current transformer iron core is easy to saturate due to direct current components and the secondary side current waveform is seriously distorted is well solved. Secondary current I 2 ＝I 23 +I 2D ＝W 1 /W 2 ·I 1 Through a standard resistor R S Acquired voltage signal I 2 R S To meet the requirement of computer and other voltage signal, where W is 1 /W 2 Is a fixed turns ratio.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A transient current measurement device, comprising: sensor head (T) and exciting transformer (T) 1 ) A butt-joint electrolytic capacitor (1), a coupling capacitor (8) and a standard resistor (R s ) An alternating current voltage amplifier (6), an alternating current power amplifier (7), a direct current voltage amplifier (4), a direct current filter demodulator (2), a total adder (3) and a direct current power amplifier (5);
the sensing head (T) comprises a third annular detection iron core (C) which is coaxially arranged from left to right 3 ) Second annular detecting iron core (C) 2 ) First annular detecting iron core (C) 1 ) Fourth annular detecting iron core (C) 4 ) The first annular detecting core (C 1 ) To fourth annular detecting cores (C) 4 ) The shape is the same, and the steel is obtained by winding cold-rolled silicon steel into a ring shape and annealing; the sensor head (T) also comprises a first annular detection iron core (C) 1 ) Is the first of (2)A detection winding (W) D1 ) Around a second annular detecting core (C) 2 ) Is arranged in the second sense winding (W) D2 ) Around a third toroidal core (C) 3 ) Is arranged in the third sense winding (W) D3 ) Around the fourth annular detecting core (C) 4 ) Is a fourth sense winding (W) D4 ) The method comprises the steps of carrying out a first treatment on the surface of the The sensor head (T) also comprises a second detection winding (W) D2 ) And a first detection winding (W D1 ) An outer first electrostatic shielding layer (E 1 ) Is coated on the third detection winding (W D3 ) An outer second electrostatic shielding layer (E 2 ) Is coated on the fourth detection winding (W D4 ) An outer third electrostatic shielding layer (E 3 ) The method comprises the steps of carrying out a first treatment on the surface of the The sensor head further includes a first electrostatic shielding layer (E 1 ) To the third electrostatic shielding layer (E 3 ) The outer magnetic shielding iron core (C) is formed by winding cold-rolled silicon steel into a ring shape, annealing and assembling; the sensor head also comprises a secondary winding (W) wound outside the magnetic shielding iron core (C) 2 ) And is located in the secondary winding (W 2 ) An outer fourth electrostatic shielding layer (E 4 )；
First detection winding (W) D1 ) Is identical to the second detection winding (W D2 ) Is connected with the heteronym end of the file; first detection winding (W) D1 ) Co-excitation transformer (T) 1 ) Is connected to the first secondary winding of the transformer through a resistor (R 1 ) In parallel, a first detection winding (W D1 ) Is grounded, and the exciting transformer (T) 1 ) The homonymous end of the first secondary winding is connected with the input end of a direct current voltage amplifier (4), the output end of the direct current voltage amplifier (4) is connected with one input end of a total adder (3), the output end of the total adder (3) is connected with the input end of a direct current power amplifier (5), and the output end of the direct current power amplifier (5) and the secondary winding (W) 2 ) Is connected with the heteronym end of the file; second detection winding (W) D2 ) Co-excitation transformer (T) 1 ) Through a resistor (R 2 ) In parallel, a second detection winding (W D2 ) The homonymous terminal is simultaneously connected with the input terminal of the direct current filter demodulator (2), and the output terminal of the direct current filter demodulator (2) is connected with the other input terminal of the total adder (3);
third detection winding (W) D3 ) Is the same as the fourthDetection winding (W) D4 ) Is connected to the same-name end of the fourth detection winding (W D4 ) Is grounded, and the third detection winding (W D3 ) The same-name end of the capacitor is connected with the input end of an alternating current voltage amplifier (6), the output end of the alternating current voltage amplifier (6) is connected with the input end of an alternating current power amplifier (7), the output end of the alternating current power amplifier (7) is connected with one end of a coupling capacitor (8), and the other end of the coupling capacitor (8) is connected with a secondary winding (W) 2 ) Is a heteronym terminal of (a); secondary winding (W) 2 ) The opposite end of (a) is grounded through a butt electrolytic capacitor (1), and a secondary winding (W) 2 ) Is connected with the same-name end of the resistor (R s ) And (5) grounding.
2. The transient current measurement device according to claim 1, wherein said first electrostatic shielding layer (E 1 ) To fourth electrostatic shielding layers (E 4 ) The materials of (a) are copper foil.
3. Transient current measurement device according to claim 1 or 2, characterized in that the first detection winding (W D1 ) Is arranged in the second sense winding (W) D2 ) Is arranged in the third sense winding (W) D3 ) Is arranged between the number of turns of the fourth detection winding (W D4 ) The number of turns of (a) is the same.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810216878.7A CN108490239B (en) | 2018-03-16 | 2018-03-16 | Transient current measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810216878.7A CN108490239B (en) | 2018-03-16 | 2018-03-16 | Transient current measuring device |
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| CN108490239A CN108490239A (en) | 2018-09-04 |
| CN108490239B true CN108490239B (en) | 2023-10-24 |
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| CN86100363A (en) * | 1985-01-26 | 1986-09-10 | Mwb传感器制造股份公司 | Eliminate method, circuit and the device of DC voltage component in the capacitive AC voltage divider |
| US5307008A (en) * | 1991-11-04 | 1994-04-26 | National Research Council Of Canada | Current ratio device and toroidal core assembly therefor |
| CN1412568A (en) * | 2002-10-25 | 2003-04-23 | 华中科技大学 | D.C. current sensing device |
| CN101571557A (en) * | 2009-06-09 | 2009-11-04 | 华中科技大学 | DC high-current metering device |
| CN103308743A (en) * | 2013-05-24 | 2013-09-18 | 华中科技大学 | Direct current metering device |
| CN105353193A (en) * | 2015-11-27 | 2016-02-24 | 华中科技大学 | Low direct current clamp-shaped measuring device |
| CN105510673A (en) * | 2015-11-27 | 2016-04-20 | 华中科技大学 | Direct current measuring device |
| CN208140773U (en) * | 2018-03-16 | 2018-11-23 | 华中科技大学 | A kind of measurement of transient current device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2868663C (en) * | 2013-10-21 | 2016-11-08 | Tomasz Barczyk | Methods and systems relating to ac current measurements |
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2018
- 2018-03-16 CN CN201810216878.7A patent/CN108490239B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100363A (en) * | 1985-01-26 | 1986-09-10 | Mwb传感器制造股份公司 | Eliminate method, circuit and the device of DC voltage component in the capacitive AC voltage divider |
| US5307008A (en) * | 1991-11-04 | 1994-04-26 | National Research Council Of Canada | Current ratio device and toroidal core assembly therefor |
| CN1412568A (en) * | 2002-10-25 | 2003-04-23 | 华中科技大学 | D.C. current sensing device |
| CN101571557A (en) * | 2009-06-09 | 2009-11-04 | 华中科技大学 | DC high-current metering device |
| CN103308743A (en) * | 2013-05-24 | 2013-09-18 | 华中科技大学 | Direct current metering device |
| CN105353193A (en) * | 2015-11-27 | 2016-02-24 | 华中科技大学 | Low direct current clamp-shaped measuring device |
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