CN102121976A - Portable polarity calibration device for mutual inductor - Google Patents
Portable polarity calibration device for mutual inductor Download PDFInfo
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- CN102121976A CN102121976A CN2010100042203A CN201010004220A CN102121976A CN 102121976 A CN102121976 A CN 102121976A CN 2010100042203 A CN2010100042203 A CN 2010100042203A CN 201010004220 A CN201010004220 A CN 201010004220A CN 102121976 A CN102121976 A CN 102121976A
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- mutual inductor
- phase comparator
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- polarity tester
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Abstract
The invention discloses a portable polarity calibration device for a mutual inductor. The portable polarity calibration device comprises a square wave generator, an amplifier circuit, a shaper, a phase comparator, a filter and a result prompter, wherein the square wave generator is connected with the amplifier circuit; the shaper is connected with the phase comparator; the square wave generator is connected with the phase comparator; both the amplifier circuit and the shaper are provided with a connection port; the filter is connected with the phase comparator; the result prompter is connected to the back of the filter and responds to a result of the phase comparator. A rechargeable battery is also arranged in the portable polarity calibration device and can work without an external power supply. In the portable polarity calibration device for the mutual inductor, the high-capacity rechargeable battery is internally arranged for power supply, and an under voltage indication is shown on a device panel when the battery has a lower voltage, so that over electric discharge for the internal battery, which enables the device not to work, can be prevented.
Description
Technical field
The present invention relates to a kind of portable mutual inductor polarity tester, belong to electrical technology field.
Background technology
Current transformer should carry out polarity test before and after handing-over and overhaul; in case it is when wiring that polarity is mistaken; cause on relay protection circuit and measurement loop in cause the protective device malfunction and can not be correct measure, so must before putting into operation, do polarity test.
The method of polarity of measuring current transformer is a lot, and we have following two kinds of test methods what work was adopted often: 1. DC-method; 2. AC method.
1 DC-method
See accompanying drawing 3.Its positive pole is connected to the primary winding L1 of mutual inductor with 1.5～3V dry cell, L2 connects negative pole, the secondary side K1 of mutual inductor connects the milliammeter positive pole, negative pole meets K2, after carefully connecting the wire,, draw back back milliammeter pointer negative bias with the K milliammeter pointer positively biased of closing, illustrate that the termination that mutual inductor is connected on the anode is a same polarity with the termination that is connected on the milliammeter anode, promptly L1, K1 are that same polarity is that mutual inductor is a subtractive polarity.As the beat of pointer with above-mentioned opposite be additive polarity.
2 AC method
See accompanying drawing 4, the L2 and the secondary side K2 of current transformer first and second coil coupled together with lead, pass to the alternating voltage (using little range) of 1～5V, measure the numerical value of U2 and U3 if U3=U1-U2 is a subtractive polarity with the following voltage table of 10V at secondary side.
U3=U1+U2 is an additive polarity.Attention: in process of the test, as far as possible make feeding voltage low, in order to avoid the too big damage coil of electric current, know voltage table for reading selects smaller as far as possible, transformer ratio 5 adopt when following AC method measure fairly simple accurately, transformer ratio surpassed 10 mutual inductor and do not adopt this method to measure, because the numerical value of the less U3 of the numerical value of U2 and U1 is approaching, it is big or small that the reading of voltage table is difficult for difference, so bad distinguishing when measuring generally should not adopt this method to measure polarity.
Be not difficult to find out at above mutual inductor polarity testing feature:
Method 1 is no doubt simple, but generally needs 2 people operation, and when once being switched on or switched off, needing two people to echo, otherwise might obtain opposite result;
Method 2 needs 3 voltage tables or measures respectively 3 times, and operation bothers and also needs to calculate and just can obtain the result.
Summary of the invention
At the technical matters of above-mentioned existence, the purpose of this invention is to provide a kind of portable mutual inductor polarity tester.
Realize that technical scheme of the present invention is: a kind of portable mutual inductor polarity tester comprises square-wave generator, power amplifier, reshaper, phase comparator, wave filter, results suggest device; Described square-wave generator links to each other with power amplifier; Described reshaper links to each other with phase comparator; Described square-wave generator links to each other with phase comparator; Described power amplifier, reshaper all are provided with Wiring port; Described wave filter links to each other with phase comparator; Described results suggest device is connected the wave filter back and makes corresponding to the result of phase comparator.
Preferably, the inside of described portable mutual inductor polarity tester also includes a rechargeable battery, works under the situation of dispense with outer connecting power again.
Preferably, the inside of described portable mutual inductor polarity tester also includes under-voltage indicator, and when cell voltage was low, operating personnel were reminded in described under-voltage indicator work, prevents that internal battery from can not work because of overdischarge causes instrument.
Preferably, the described results suggest device LED lamp that is two kinds of different colours; A kind of result of the bright representative of the lamp of every kind of color.
Preferably, described results suggest device is two kinds of different beep generator; Every kind of buzzer is represented a kind of result.
Because the utilization of technique scheme, the present invention compared with prior art has following advantage:
The present invention program's portable mutual inductor polarity tester adopts the power supply of built-in high capacity rechargeable battery and when cell voltage was low, instrument panel owed end finger and shows, prevents that internal battery from can not work because of overdischarge causes instrument; The verification mode of portable mutual inductor polarity tester is: the square wave that is produced frequency adjustable by waveform generator, through power amplifier it is become the adjustable square-wave signal of amplitude, feed this frequency and the adjustable square-wave signal of amplitude to the more side winding of the mutual inductor number of turn, then from the less relatively winding acquired signal of the mutual inductor opposite side number of turn, the waveform that produces with square-wave generator after the signal shaping that collects is carried out bit comparison mutually, the waveform that obtains after is relatively carried out filtering, after window relatively waits and handles, draw polar relationship by lighting LED and driving the hummer sounding.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Accompanying drawing 1 is the theory diagram of the portable mutual inductor polarity tester of the present invention;
Accompanying drawing 2 is the panel figure of the portable mutual inductor polarity tester of the present invention;
Accompanying drawing 3 is surveyed the circuit diagram of current transformer polarity for DC-method;
Accompanying drawing 4 is surveyed the circuit diagram of current transformer polarity for AC method;
Wherein: 1, to-be-tested transformer.
Embodiment:
A kind of portable mutual inductor polarity tester of the present invention comprises square-wave generator, power amplifier, reshaper, phase comparator, wave filter, results suggest device; Described square-wave generator links to each other with power amplifier; Described reshaper links to each other with phase comparator; Described square-wave generator links to each other with phase comparator; Described power amplifier, reshaper all are provided with Wiring port; Described wave filter links to each other with phase comparator; Described results suggest device is connected the wave filter back and makes corresponding to the result of phase comparator; The inside of described portable mutual inductor polarity tester also includes a rechargeable battery, works under the situation of dispense with outer connecting power again; The inside of described portable mutual inductor polarity tester also includes under-voltage indicator, and when cell voltage was low, operating personnel were reminded in described under-voltage indicator work, prevents that internal battery from can not work because of overdischarge causes instrument; The LED lamp that described results suggest device is two kinds of different colours; A kind of result of the bright representative of the lamp of every kind of color; Described results suggest device also can be two kinds of beep generator; Every kind of buzzer is represented a kind of result.
Its course of work is as follows: it is corresponding continuous that the to-be-tested transformer 1 of polarity to be measured and portable mutual inductor polarity tester press label " L1, L2, K1, K2 " (or " A, X, a, x ") by 4 leads, frequency modulation, the adjusting pressuring knob of portable mutual inductor polarity tester are transferred to the end counterclockwise, the frequency of output terminal " K1, K2 (or A, X) " output waveform of polarity tester is the highest at this moment, and voltage is minimum.Turn on the power switch, regulate clockwise adjusting pressuring knob until the polarity indication LED of portable mutual inductor polarity tester lighted, the hummer sounding, can know the polarity of mutual inductor this moment according to LED and hummer.
Annotate: the effect of fm dial is: clockwise adjusting knob, and the frequency of the output terminal of polarity tester " K1, K2 (or A, X) " output waveform can reduce, and output loop induction reactance is reduced, and loop current increases.It also is the output loop reactance (or electric current) that frequency modulation can change polarity tester.
Because the utilization of technique scheme, the present invention compared with prior art has following advantage:
The present invention program's portable mutual inductor polarity tester adopts the power supply of built-in high capacity rechargeable battery and when cell voltage was low, instrument panel owed end finger and shows, prevents that internal battery from can not work because of overdischarge causes instrument; Portable mutual inductor polarity tester verification mode is: the square wave that is produced frequency adjustable by waveform generator, through power amplifier it is become the adjustable square-wave signal of amplitude, feed this frequency and the adjustable square-wave signal of amplitude to the more side winding of the mutual inductor number of turn, then from the less relatively winding acquired signal of the mutual inductor opposite side number of turn, the waveform that produces with square-wave generator after the signal shaping that collects is carried out bit comparison mutually, the waveform that obtains after is relatively carried out filtering, after window relatively waits and handles, draw polar relationship by lighting LED and driving the hummer sounding.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, or any to move mode dull and stereotyped described in the present invention, all drop within the rights protection scope of the present invention.
Claims (5)
1. a portable mutual inductor polarity tester is characterized in that: comprise square-wave generator, power amplifier, reshaper, phase comparator, wave filter, results suggest device; Described square-wave generator links to each other with power amplifier; Described reshaper links to each other with phase comparator; Described square-wave generator links to each other with phase comparator; Described power amplifier, reshaper all are provided with Wiring port; Described wave filter links to each other with phase comparator; Described results suggest device is connected the wave filter back and makes corresponding to the result of phase comparator.
2. portable mutual inductor polarity tester according to claim 1 is characterized in that: also include a rechargeable battery, work under the situation of dispense with outer connecting power.
3. portable mutual inductor polarity tester according to claim 1, it is characterized in that: also include under-voltage indicator, when cell voltage is low, described under-voltage indicator work, remind operating personnel, prevent that internal battery from can not work because of overdischarge causes instrument.
4. portable mutual inductor polarity tester according to claim 1 is characterized in that: the LED lamp that described results suggest device is two kinds of different colours; A kind of result of the bright representative of the lamp of every kind of color.
5. portable mutual inductor polarity tester according to claim 1 is characterized in that: described results suggest device is two kinds of different beep generator; Every kind of buzzer is represented a kind of result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100042203A CN102121976A (en) | 2010-01-12 | 2010-01-12 | Portable polarity calibration device for mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100042203A CN102121976A (en) | 2010-01-12 | 2010-01-12 | Portable polarity calibration device for mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102121976A true CN102121976A (en) | 2011-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010100042203A Pending CN102121976A (en) | 2010-01-12 | 2010-01-12 | Portable polarity calibration device for mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102121976A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104133154A (en) * | 2013-05-03 | 2014-11-05 | 武汉凯默电气有限公司 | Intelligent substation current transformer polarity test method and device |
| CN105510713A (en) * | 2014-09-26 | 2016-04-20 | 中微半导体设备(上海)有限公司 | Phase comparator and phase difference monitoring device |
| CN105954647A (en) * | 2016-06-23 | 2016-09-21 | 国网江苏省电力公司连云港供电公司 | Split type mutual inductor polarity discriminator |
| CN112327215A (en) * | 2020-10-31 | 2021-02-05 | 贵州电网有限责任公司 | Portable current transformer polarity calibration equipment |
-
2010
- 2010-01-12 CN CN2010100042203A patent/CN102121976A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104133154A (en) * | 2013-05-03 | 2014-11-05 | 武汉凯默电气有限公司 | Intelligent substation current transformer polarity test method and device |
| CN104133154B (en) * | 2013-05-03 | 2016-12-28 | 武汉凯默电气有限公司 | A kind of intelligent substation current transformer polarity testing method and device |
| CN105510713A (en) * | 2014-09-26 | 2016-04-20 | 中微半导体设备(上海)有限公司 | Phase comparator and phase difference monitoring device |
| CN105510713B (en) * | 2014-09-26 | 2018-06-22 | 中微半导体设备(上海)有限公司 | Phase comparator and phase difference monitoring device |
| CN105954647A (en) * | 2016-06-23 | 2016-09-21 | 国网江苏省电力公司连云港供电公司 | Split type mutual inductor polarity discriminator |
| CN112327215A (en) * | 2020-10-31 | 2021-02-05 | 贵州电网有限责任公司 | Portable current transformer polarity calibration equipment |
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| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110713 |