CN201926710U - Programmable power supply insulation resistance and grounding resistance comprehensive test instrument - Google Patents
Programmable power supply insulation resistance and grounding resistance comprehensive test instrument Download PDFInfo
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- CN201926710U CN201926710U CN2010206426359U CN201020642635U CN201926710U CN 201926710 U CN201926710 U CN 201926710U CN 2010206426359 U CN2010206426359 U CN 2010206426359U CN 201020642635 U CN201020642635 U CN 201020642635U CN 201926710 U CN201926710 U CN 201926710U
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Abstract
The utility model discloses a programmable power supply insulation resistance and grounding resistance comprehensive test instrument, which comprises an insulation resistance testing circuit, a grounding resistance testing circuit, an A/D (Analog to Digital) converter, a microcontroller, a keyboard and a display, wherein signal output ends of the insulation resistance testing circuit and the grounding resistance testing circuit are both connected with the A/D converter, the A/D converter is connected with the microcontroller through a signal transmission line, and the keyboard and the display are connected to the microcontroller through interfaces. The comprehensive test instrument can better realize the comprehensive test of power supply insulation resistance and grounding resistance of electrical equipment, has a small size, a large measurement range, high testing precision and reliable performance, is convenient to carry and use and easy to operate, works stably, and can realize integration of measurement, control and display.
Description
Technical field
The utility model belongs to the electrical technical field, particularly a kind of programmable power supply insulation resistance and stake resistance comprehensive tester.
Background technology
Electrical safety is the Essential Performance Requirements of electrical equipment operate as normal, and its basic index comprises: insulation resistance, stake resistance, leakage current and compressive resistance.Wherein, insulation resistance is meant the resistance value between two parts conductor that separates with insulating material, and its value size has reflected the dielectric strength between two parts conductor; Stake resistance is meant the resistance between the touched metallic object of electrical equipment and the earth terminal (line) that this equipment is drawn, and it is one has the parameter of direct influence to human body safety, normally generally in tens milliohms.At present, domestic security appliance performance tester is the single index tester mostly, and owing to require to produce big electric current and high voltage, the signal power source system usually adopts traditional mimic channel power supply, therefore heavy and operation inconvenience, and the accurate testing degree is also poor.
The utility model content
The purpose of this utility model is to provide a kind of can the realization that insulation resistance, stake resistance are carried out integration test, working stability, the testing precision height, and can realize measuring, control, show incorporate programmable power supply insulation resistance and stake resistance comprehensive tester.
Realize that the technical scheme that the purpose of this utility model adopted is: this comprehensive tester comprises megger test loop, earth resistance loop, A/D converter, microcontroller, keyboard and display, the signal output part in megger test loop and earth resistance loop all is connected with A/D converter, A/D converter is connected with microcontroller by signal transmssion line, and keyboard and display are connected on the microcontroller by interface;
Described megger test loop is by program control DC high-voltage power supply, the megger test circuit, supply voltage gathers circuit and the dividing potential drop circuit is formed, it is in parallel with the megger test circuit that supply voltage is gathered circuit, and be connected with program control DC high-voltage power supply, supply voltage is gathered circuit and is connected with described A/D converter respectively with the signal output part that supply voltage is gathered circuit, supply voltage is gathered circuit and is provided with fixed resistance, one end of dividing potential drop circuit is connected by gathering circuit with supply voltage on the fixed resistance, the other end is parallel with several sampling resistors, this sampling resistor is connected with the megger test circuit by transfer relay, and program control DC high-voltage power supply is connected with described microcontroller by signal transmssion line;
Described earth resistance loop has a program control alternating current power supply, this program control alternating current power supply is by pressure limiting resistance and be connected to the voltage signal acquisition circuit and the earth resistance circuit, described voltage signal acquisition circuit is provided with voltage signal acquisition device and voltage true-effective value converter, its signal output part is connected with described A/D converter, described earth resistance circuit is provided with current sensor, its signal output part is connected with described A/D converter, current sensor is connected with program control alternating current power supply by lead, and program control alternating current power supply is connected with described microcontroller by signal transmssion line.
Described voltage is true-and the effective value converter adopts the AD536 converter.
Described current sensor adopts Hall current sensor LEM module.
Described microcontroller adopts 16 single-chip microcomputer 87C196.
Programmable power supply insulation resistance and the stake resistance comprehensive tester made according to such scheme, by the setting in megger test loop and earth resistance loop, and adopt microcontroller to carry out switching controls, can realize the integration test of the electrical equipment insulation resistance of main and stake resistance preferably, it is little to have volume, portably use conveniently, working stability, it is big to measure range ability, the testing precision height, dependable performance, easy and simple to handle, can realize measuring, control, show advantages such as integrated.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Referring to Fig. 1, programmable power supply insulation resistance of the present utility model and stake resistance comprehensive tester have a megger test loop, are used for the test of insulation resistance; An earth resistance loop is used for the test of stake resistance; An A/D converter 2 is used for the voltage signal and the current signal in megger test loop and earth resistance loop are converted to digital signal respectively; A microcontroller 1 is used for processing, the access of the switching controls and the test signal of megger test or earth resistance state; A keyboard 15 and a display 16 that is used for the detecting information demonstration that is used for the operational order input.The signal output part in megger test loop and earth resistance loop all is connected with A/D converter 2, and A/D converter 2 is connected with microcontroller 1 by transmission line, and keyboard 15 and display 16 are connected on the microcontroller 1 by interface.Described megger test loop gathers circuit by program control DC high-voltage power supply 7, megger test circuit, supply voltage and the dividing potential drop circuit is formed.It is in parallel with the megger test circuit that supply voltage is gathered circuit, and be connected with program control DC high-voltage power supply 7.The signal output part that supply voltage is gathered circuit is connected with described A/D converter 2 respectively.Be provided with fixed resistance 6 on supply voltage collection circuit, an end of dividing potential drop circuit is gathered circuit by fixed resistance 8 and supply voltage and is connected; The other end is parallel with several sampling resistors 3, and this sampling resistor 3 is connected with the megger test circuit by transfer relay 4, is used for carrying out automatically under the control of microcontroller 1 switching of range, measures with the whole process that ensures measuring accuracy and realization insulation resistance.Program control DC high-voltage power supply 7 is connected with described microcontroller 1 by signal transmssion line, is used for the switching of test mode.Described earth resistance loop has a program control alternating current power supply 9, this program control alternating current power supply 9 is by pressure limiting resistance 10 and be connected to the voltage signal acquisition circuit and the earth resistance circuit, described voltage signal acquisition circuit is provided with voltage signal acquisition device 13 and voltage true-effective value converter 14, its signal output part is connected with described A/D converter 2.Described voltage is true-effective value converter 14 can adopt the AD536 converter, AD536 have use simple, peripheral circuit is few, can select advantage such as single duplicate supply pattern, be widely used in the test instrumentation.Described earth resistance circuit is provided with current sensor 12, and its signal output part is connected with described A/D converter 2, and current sensor 12 is connected with program control alternating current power supply 9 by lead.Described current sensor 12 can adopt Hall current sensor LEM module, and it can measure the current signal of random waveform, and its precision height, the linearity is good, response speed is fast, overload capacity is strong, and simple circuit and secondary circuit are isolated fully.Program control alternating current power supply 9 is connected with described microcontroller 1 by signal transmssion line, is used for the switching of test mode.Described microcontroller 1 can adopt 16 single-chip microcomputer 87C196, there are 8 or 10 A/D converters, 16KB ROM and the 488Byte RAM that sampling keeps function that have of 13 passages its inside, dominant frequency can reach 20MHz, A/D switching time is 22 μ S when 12MHz, have very strong signal handling capacity, and can to carry control dutycycle variable highest resolution be the pwm signal of 1/65536 (16); Adopt keyboard 15, display chip 8279, can preset and show electric current, voltage, resistance and detection time, make operation easier.
Principle of work: this comprehensive tester in use, can be according to the kind of testing resistance, by operation microcontroller 1 switch operating state (megger test state or earth resistance state), and select program control DC high-voltage power supply 7 or program control alternating current power supply 9 testing power supply as testing resistance 5 or testing resistance 7 according to duty, testing resistance 7 or testing resistance 9 are connected on megger test circuit or the earth resistance circuit, carry out closed-loop control and measurement by A/D converter 2 input microcontrollers 1.
When carrying out the test of insulation resistance, program control DC high-voltage power supply 7 produces the desired three kinds of d. c. voltage signals of IEC61010 standard (250VDC, 500VDC, 1000VDC) under the control of microcontroller 1, be applied to testing resistance 5.The megger test scope of this comprehensive tester can be set at 0.01M Ω-1000M Ω, because the A/D converting system can only be gathered the d. c. voltage signal of 0V-5V, so for the measuring accuracy of safeguards system and the whole process measurement of realization insulation resistance, adopting sampling resistor 3 to carry out automatic range switches, by relay control switch 4 selection in the sampling resistors (0.1K Ω, 1K Ω, 10K Ω, 100K Ω) of 4 different sizes, can adjust to suitable range automatically by microcontroller in the measured signal outrange or when owing range.In test process, when the resistance of measured resistance 5 hour because the dividing potential drop effect of sampling resistor 3, the voltage that is added in measured resistance 5 two ends obviously will be lower than the requirement magnitude of voltage.In order to address this problem, this comprehensive tester adds the voltage sample link before measured resistance 5, and promptly in input end parallel resistance 6, high pressure obtains sampled voltage U1 through resistance series connection decay.The electric potential difference of voltage sample value U2 on U1 and the sampling resistor 3 is the virtual voltage at testing resistance 5 two ends.Like this, output voltage control signal after can comparing by microcontroller 1 is controlled the voltage amplitude of program control DC high-voltage power supply 7, thereby can accurately be controlled the voltage that is applied on the testing resistance 55, improves measuring accuracy.Then, detect the electric current that flows through testing resistance 5, calculate the resistance of testing resistance 5 according to the voltmeter of setting that is applied on the testing resistance 5 again by the voltage U 2 on the measurement sampling resistor 3 and the resistance of sampling resistor 3.
When carrying out the test of stake resistance, according to the IEC61010 standard, program control alternating current power supply 9 produces 1.5 times or the exchange current (choosing bigger among both) of 25A of electrical equipment rated current, and no-load voltage is no more than 12V.It is flow through between ground connection terminal (or earthing pole) and each metalwork that is easily touched,, calculate grounding resistance (stake resistance should not surpass 0.1 Ω) according to applying current value by measuring pressure drop.
Claims (4)
1. programmable power supply insulation resistance and stake resistance comprehensive tester, it is characterized in that: it comprises megger test loop, earth resistance loop, A/D converter, microcontroller, keyboard and display, the signal output part in megger test loop and earth resistance loop all is connected with A/D converter, A/D converter is connected with microcontroller by signal transmssion line, and keyboard and display are connected on the microcontroller by interface;
Described megger test loop is by program control DC high-voltage power supply, the megger test circuit, supply voltage gathers circuit and the dividing potential drop circuit is formed, it is in parallel with the megger test circuit that supply voltage is gathered circuit, and be connected with program control DC high-voltage power supply, supply voltage is gathered circuit and is connected with described A/D converter respectively with the signal output part that supply voltage is gathered circuit, supply voltage is gathered circuit and is provided with fixed resistance, one end of dividing potential drop circuit is connected by gathering circuit with supply voltage on the fixed resistance, the other end is parallel with several sampling resistors, this sampling resistor is connected with the megger test circuit by transfer relay, and program control DC high-voltage power supply is connected with described microcontroller by signal transmssion line;
Described earth resistance loop has a program control alternating current power supply, this program control alternating current power supply is by pressure limiting resistance and be connected to the voltage signal acquisition circuit and the earth resistance circuit, described voltage signal acquisition circuit is provided with voltage signal acquisition device and voltage true-effective value converter, its signal output part is connected with described A/D converter, described earth resistance circuit is provided with current sensor, its signal output part is connected with described A/D converter, current sensor is connected with program control alternating current power supply by lead, and program control alternating current power supply is connected with described microcontroller by signal transmssion line.
2. programmable power supply insulation resistance as claimed in claim 1 and stake resistance comprehensive tester is characterized in that: and described voltage is true-and the effective value converter adopts the AD536 converter.
3. programmable power supply insulation resistance as claimed in claim 1 and stake resistance comprehensive tester is characterized in that: described current sensor adopts Hall current sensor LEM module.
4. programmable power supply insulation resistance as claimed in claim 1 and stake resistance comprehensive tester is characterized in that: described microcontroller adopts 16 single-chip microcomputer 87C196.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206426359U CN201926710U (en) | 2010-12-06 | 2010-12-06 | Programmable power supply insulation resistance and grounding resistance comprehensive test instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206426359U CN201926710U (en) | 2010-12-06 | 2010-12-06 | Programmable power supply insulation resistance and grounding resistance comprehensive test instrument |
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| Publication Number | Publication Date |
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| CN201926710U true CN201926710U (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206426359U Expired - Fee Related CN201926710U (en) | 2010-12-06 | 2010-12-06 | Programmable power supply insulation resistance and grounding resistance comprehensive test instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128984A (en) * | 2010-12-06 | 2011-07-20 | 河南省电力公司南阳供电公司 | Comprehensive tester of programmable power supply insulation resistance and earthed resistance |
| CN102866301A (en) * | 2012-09-18 | 2013-01-09 | 深圳远征技术有限公司 | Grounding resistance analyzing device and grounding resistance analyzing method |
| CN104360162A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | Live line measurement device for contact resistance of high voltage loop |
| CN110376492A (en) * | 2019-07-12 | 2019-10-25 | 中国铁路北京局集团有限公司北京车辆段 | A kind of insulation tester |
-
2010
- 2010-12-06 CN CN2010206426359U patent/CN201926710U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128984A (en) * | 2010-12-06 | 2011-07-20 | 河南省电力公司南阳供电公司 | Comprehensive tester of programmable power supply insulation resistance and earthed resistance |
| CN102866301A (en) * | 2012-09-18 | 2013-01-09 | 深圳远征技术有限公司 | Grounding resistance analyzing device and grounding resistance analyzing method |
| CN102866301B (en) * | 2012-09-18 | 2016-12-07 | 深圳远征技术有限公司 | A kind of earth resistance analytical equipment and the analysis method of earth resistance |
| CN104360162A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | Live line measurement device for contact resistance of high voltage loop |
| CN110376492A (en) * | 2019-07-12 | 2019-10-25 | 中国铁路北京局集团有限公司北京车辆段 | A kind of insulation tester |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20131206 |