CN105403772A - Transformer DC resistance testing device - Google Patents
Transformer DC resistance testing device Download PDFInfo
- Publication number
- CN105403772A CN105403772A CN201510728161.7A CN201510728161A CN105403772A CN 105403772 A CN105403772 A CN 105403772A CN 201510728161 A CN201510728161 A CN 201510728161A CN 105403772 A CN105403772 A CN 105403772A
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- transformer
- resistance
- microcontroller
- sample circuit
- testing
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a transformer DC resistance testing device. The transformer DC resistance testing device comprises a constant-current power supply, a standard resistor, a standard current sampling circuit, a standard voltage sampling circuit, a tested transformer, a sampling circuit, an A/D converter, a microcontroller, a memory for storing test data obtained by the microcontroller, and output display equipment for displaying the test data obtained by the microcontroller; and the sampling circuit is connected with the tested transformer through a test end, and the sampling circuit is connected with the microcontroller through the A/D converter. In the test process of a DC resistance value of the tested transformer, through arrangement of the standard resistor, the device can achieve calibration for the transformer DC resistance testing device, so the problem of a measurement error caused by a temperature or humidity influence in a test process is prevented.
Description
Technical field
The present invention relates to a kind of device for testing DC resistance of transformer.
Background technology
Direct current resistance test is transformer after handing-over, overhaul and change shunting switch, requisite pilot project.The measurement of Transformer Winding direct current resistance is pilot project important in transformer test.By the direct current resistance of measuring transformer winding and sleeve, the welding quality of winding inner lead, lead-in wire and the welding quality of winding, each tap position of voltage tap switch can be reflected and go between with the contact of sleeve pipe whether well, correctly whether parallel branch be connected, transformer current carrying part with or without short-circuit conditions and winding with or without short circuit phenomenon.
Use traditional method, bridge method and pressure decline method, the direct current resistance of measuring transformer winding and high-power inductive devices is a time-consuming job of taking a lot of work.In order to change this situation, shortening Measuring Time and alleviating the work load of tester.Existing direct current resistance proving installation improves traditional measuring method.But because when measuring, temperature and humidity can cause certain influence to the accuracy of measurement result, it is undesirable still to there is measurement result reliability in existing measurement mechanism, needs the problem improved.
The problems referred to above should be paid attention in direct current resistance test process and the problem solved.
Summary of the invention
The object of this invention is to provide a kind of device for testing DC resistance of transformer to solve because when measuring, temperature and humidity can cause certain influence to the accuracy of measurement result, it is undesirable still to there is measurement result reliability in existing measurement mechanism, needs the problem improved.
Technical solution of the present invention is:
A kind of device for testing DC resistance of transformer, comprise constant-current supply, measuring resistance, normalized current sample circuit, normal voltage sample circuit, tested transformer, sample circuit, A/D converter, microcontroller, for storing the storer of microcontroller gained test data and the output display unit for showing microcontroller gained test data, described sample circuit connects described tested transformer by test lead, described sample circuit connects described microcontroller by A/D converter, described normalized current sample circuit, normal voltage sample circuit all connects described measuring resistance, described normalized current sample circuit, normal voltage sample circuit all connects described microcontroller, described microcontroller connects described storer and conveying display device respectively.
Preferably, described test lead is connected with connection terminal by solenoid valve, and described connection terminal connects described tested transformer.
Preferably, described test lead is provided with the pushbutton switch for controlling described solenoid valve.
Preferably, the resistance of described measuring resistance is 5-20 Ω.
Preferably, described output display unit comprises LCD display and printer.
A kind of device for testing DC resistance of transformer of the present invention, in the process of the direct current resistance of the tested transformer of test, by arranging measuring resistance, the check and correction to this kind of device for testing DC resistance of transformer can be realized, thus avoid the problem of the measuring error caused due to the impact of temperature or humidity in test process.This kind of device for testing DC resistance of transformer, by normalized current sample circuit, the normal voltage sample circuit of connection standard resistance, being drawn the measurement resistance of this measuring resistance by microcontroller, contrast with the resistance of this measuring resistance, determining the measured deviation when testing.When measuring tested transformer, tested transformer is connected by test lead, after carrying out signals collecting by sample circuit, digital signal is converted to microcontroller by A/D converter, after microcontroller draws measurement result, storer carries out storage measurement result, simultaneously LCD display display measurement result, or uses printer to carry out printing measurement result.
This kind of device for testing DC resistance of transformer, by arranging the pushbutton switch of solenoid valve and Controlling solenoid valve at test lead, thus pass through the energising of control knob switch control rule solenoid valve, make solenoid valve promote connection terminal and be connected on tested transformer, the stable of connection can be ensured, be beneficial to use.This kind of device for testing DC resistance of transformer, constant-current supply adopts regulated power supply, establishing criteria voltage sampling circuit, microcontroller regulates regulated power supply, realize this kind of device for testing DC resistance of transformer automatically to select to measure electric current, make measurement electric current be the different measuring gears such as 1A, 3A, 5A, 10A, 20A, 30A.
The invention has the beneficial effects as follows: a kind of device for testing DC resistance of transformer of the present invention, in the process of the direct current resistance of the tested transformer of test, by arranging measuring resistance, the check and correction to this kind of device for testing DC resistance of transformer can be realized, thus avoid the problem of the measuring error caused due to the impact of temperature or humidity in test process.This kind of device for testing DC resistance of transformer, is controlled automatically by internal microcontroller, need not the gear shift of manual switchover electric current, reaches wider measurement range and best measuring state.This kind of device for testing DC resistance of transformer, reasonable in design, easy to use, accuracy and the reliability of measuring structure can be ensured.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Wherein: 1-constant-current supply, 2-measuring resistance, 3-normalized current sample circuit, 4-normal voltage sample circuit, the tested transformer of 5-, 6-sample circuit, 7-A/D converter, 8-microcontroller, 9-storer, 10-test lead, 11-solenoid valve, 12-connection terminal, 13-LCD display screen, 14-printer.
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the present embodiment provides a kind of device for testing DC resistance of transformer, comprise constant-current supply 1, measuring resistance 2, normalized current sample circuit 3, normal voltage sample circuit 4, tested transformer 5, sample circuit 6, A/D converter 7, microcontroller 8, for storing the storer 9 of microcontroller 8 gained test data and the output display unit for showing microcontroller 8 gained test data, described sample circuit 6 connects described tested transformer 5 by test lead 10, described sample circuit 6 connects described microcontroller 8 by A/D converter 7, described normalized current sample circuit 3, normal voltage sample circuit 4 all connects described measuring resistance 2, described normalized current sample circuit 3, normal voltage sample circuit 4 all connects described microcontroller 8, described microcontroller 8 connects described storer 9 and conveying display device respectively.Described test lead 10 is connected with connection terminal 12 by solenoid valve 11, and described connection terminal 12 connects described tested transformer 5.Described test lead 10 is provided with the pushbutton switch for controlling described solenoid valve 11.The resistance of described measuring resistance 2 is 5-20 Ω, is preferably 10 Ω.Described output display unit comprises LCD display 13 and printer 14.
A kind of device for testing DC resistance of transformer of the present embodiment, in the process of the direct current resistance of the tested transformer 5 of test, by arranging measuring resistance 2, the check and correction to this kind of device for testing DC resistance of transformer can be realized, thus avoid the problem of the measuring error caused due to the impact of temperature or humidity in test process.This kind of device for testing DC resistance of transformer, by normalized current sample circuit 3, the normal voltage sample circuit 4 of connection standard resistance 2, being drawn the measurement resistance of this measuring resistance 2 by microcontroller 8, contrast with the resistance of this measuring resistance 2, determining the measured deviation when testing.When measuring tested transformer 5, tested transformer 5 is connected by test lead 10, after carrying out signals collecting by sample circuit 6, digital signal is converted to microcontroller 8 by A/D converter 7, after microcontroller 8 draws measurement result, storer 9 carries out storage measurement result, simultaneously LCD display 13 display measurement result, or uses printer 14 to carry out printing measurement result.
This kind of device for testing DC resistance of transformer, by arranging the pushbutton switch of solenoid valve 11 and Controlling solenoid valve 11 at test lead 10, thus pass through the energising of control knob switch control rule solenoid valve 11, making solenoid valve 11 promote connection terminal 12 is connected on tested transformer 5, the stable of connection can be ensured, be beneficial to use.This kind of device for testing DC resistance of transformer, constant-current supply 1 adopts regulated power supply, establishing criteria voltage sampling circuit 4, microcontroller 8 pairs of regulated power supplies regulate, realize this kind of device for testing DC resistance of transformer automatically to select to measure electric current, make measurement electric current be the different measuring gears such as 1A, 3A, 5A, 10A, 20A, 30A.
The beneficial effect of the present embodiment is: a kind of device for testing DC resistance of transformer of the present embodiment, in the process of the direct current resistance of the tested transformer of test, by arranging measuring resistance, the check and correction to this kind of device for testing DC resistance of transformer can be realized, thus avoid the problem of the measuring error caused due to the impact of temperature or humidity in test process.This kind of device for testing DC resistance of transformer, is controlled automatically by internal microcontroller, need not the gear shift of manual switchover electric current, reaches wider measurement range and best measuring state.This kind of device for testing DC resistance of transformer, reasonable in design, easy to use, accuracy and the reliability of measuring structure can be ensured.
Claims (5)
1. a device for testing DC resistance of transformer, is characterized in that: comprise constant-current supply (1), measuring resistance (2), normalized current sample circuit (3), normal voltage sample circuit (4), tested transformer (5), sample circuit (6), A/D converter (7), microcontroller (8), for storing the storer (9) of microcontroller (8) gained test data and the output display unit for showing microcontroller (8) gained test data, described sample circuit (6) connects described tested transformer (5) by test lead (10), described sample circuit (6) connects described microcontroller (8) by A/D converter (7), described normalized current sample circuit (3), normal voltage sample circuit (4) all connects described measuring resistance (2), described normalized current sample circuit (3), normal voltage sample circuit (4) all connects described microcontroller (8), and described microcontroller (8) connects described storer (9) and conveying display device respectively.
2. device for testing DC resistance of transformer as claimed in claim 1, it is characterized in that: described test lead (10) is connected with connection terminal (12) by solenoid valve (11), described connection terminal (12) connects described tested transformer (5).
3. device for testing DC resistance of transformer as claimed in claim 1, is characterized in that: described test lead (10) is provided with the pushbutton switch for controlling described solenoid valve (11).
4. the device for testing DC resistance of transformer as described in any one of claim 1-3, is characterized in that: the resistance of described measuring resistance (2) is 5-20 Ω.
5. the device for testing DC resistance of transformer as described in any one of claim 1-3, is characterized in that: described output display unit comprises LCD display (13) and printer (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510728161.7A CN105403772A (en) | 2015-10-30 | 2015-10-30 | Transformer DC resistance testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510728161.7A CN105403772A (en) | 2015-10-30 | 2015-10-30 | Transformer DC resistance testing device |
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| Publication Number | Publication Date |
|---|---|
| CN105403772A true CN105403772A (en) | 2016-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510728161.7A Pending CN105403772A (en) | 2015-10-30 | 2015-10-30 | Transformer DC resistance testing device |
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| CN (1) | CN105403772A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771620A (en) * | 2016-12-28 | 2017-05-31 | 国网河南省电力公司新乡供电公司 | A kind of DC resistance of power transformer comprehensive test analysis device |
| CN109143032A (en) * | 2018-09-03 | 2019-01-04 | 苏州华兴源创科技股份有限公司 | A kind of circuit board self-check system |
| CN109444544A (en) * | 2018-11-02 | 2019-03-08 | 国网辽宁省电力有限公司丹东供电公司 | A kind of portable constant temperature D.C. resistance calibration equipment |
| CN109799390A (en) * | 2018-12-29 | 2019-05-24 | 国网浙江建德市供电有限公司 | A kind of breaking-closing operating coil D.C. resistance intelligent device for measuring |
| CN117890785A (en) * | 2024-01-17 | 2024-04-16 | 湖南璟德科技有限公司 | Automatic detection method, system and equipment for direct-current resistance of motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101526567A (en) * | 2009-04-10 | 2009-09-09 | 武汉市佳信现代仪器有限公司 | Intelligent digitizing potential ratio resistance measuring instrument and work process thereof |
| CN202057728U (en) * | 2011-03-31 | 2011-11-30 | 武汉工程大学 | Wide-range high-precision quick test device for direct-current resistance |
| CN202093095U (en) * | 2011-06-09 | 2011-12-28 | 上海市电力公司 | Direct-current resistance tester for transformer |
| CN202119839U (en) * | 2011-06-30 | 2012-01-18 | 甘肃机电职业技术学院 | Complete digital transformer dc resistance tester |
| CN204241568U (en) * | 2014-10-10 | 2015-04-01 | 国家电网公司 | 500KV DC Resistance of Transformer and direct current degaussing tester |
-
2015
- 2015-10-30 CN CN201510728161.7A patent/CN105403772A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101526567A (en) * | 2009-04-10 | 2009-09-09 | 武汉市佳信现代仪器有限公司 | Intelligent digitizing potential ratio resistance measuring instrument and work process thereof |
| CN202057728U (en) * | 2011-03-31 | 2011-11-30 | 武汉工程大学 | Wide-range high-precision quick test device for direct-current resistance |
| CN202093095U (en) * | 2011-06-09 | 2011-12-28 | 上海市电力公司 | Direct-current resistance tester for transformer |
| CN202119839U (en) * | 2011-06-30 | 2012-01-18 | 甘肃机电职业技术学院 | Complete digital transformer dc resistance tester |
| CN204241568U (en) * | 2014-10-10 | 2015-04-01 | 国家电网公司 | 500KV DC Resistance of Transformer and direct current degaussing tester |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771620A (en) * | 2016-12-28 | 2017-05-31 | 国网河南省电力公司新乡供电公司 | A kind of DC resistance of power transformer comprehensive test analysis device |
| CN109143032A (en) * | 2018-09-03 | 2019-01-04 | 苏州华兴源创科技股份有限公司 | A kind of circuit board self-check system |
| CN109143032B (en) * | 2018-09-03 | 2021-12-14 | 苏州华兴源创科技股份有限公司 | Circuit board self-detection system |
| CN109444544A (en) * | 2018-11-02 | 2019-03-08 | 国网辽宁省电力有限公司丹东供电公司 | A kind of portable constant temperature D.C. resistance calibration equipment |
| CN109799390A (en) * | 2018-12-29 | 2019-05-24 | 国网浙江建德市供电有限公司 | A kind of breaking-closing operating coil D.C. resistance intelligent device for measuring |
| CN117890785A (en) * | 2024-01-17 | 2024-04-16 | 湖南璟德科技有限公司 | Automatic detection method, system and equipment for direct-current resistance of motor |
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Application publication date: 20160316 |