CN203616394U - An intelligent insulation resistance tester - Google Patents
An intelligent insulation resistance tester Download PDFInfo
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- CN203616394U CN203616394U CN201320844411.XU CN201320844411U CN203616394U CN 203616394 U CN203616394 U CN 203616394U CN 201320844411 U CN201320844411 U CN 201320844411U CN 203616394 U CN203616394 U CN 203616394U
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Abstract
The utility model relates to an intelligent insulation resistor tester. The intelligent insulation resistance tester is characterized in that the intelligent insulation resistance tester comprises a microprocessor; the microprocessor is connected with an input terminal of an inversion circuit through a PWM pulse width modulation circuit; an output terminal of the inversion circuit is connected with an input terminal of a voltage doubling rectifying circuit; an alternating current voltage input to the voltage doubling rectifying circuit is amplified, and is then subjected to rectification filtering and is output as a negative high voltage signal source; the two ends of the negative high voltage signal source are sequentially in series connection with a current-limiting resistor, a tested resistor and a sampling resistor unit; and one end of the sampling resistor unit is connected with the a forementioned microprocessor through a signal conditioning module. According to the intelligent insulation resistance tester of the utility model, sampling resistors can be automatically switched according to differences in test resistance values, and four different kinds of voltage grades can be output. The intelligent insulation resistance tester is large in test resistance scope. The tester is also advantaged by being high in test precision, small in error, convenient in operation, good in stability, etc., and a reliably guarantee is provided for measuring insulating properties of electric appliance equipment.
Description
Technical field
The utility model relates to a kind of Intelligent insulation resistance meter.
Background technology
Insulation resistance is the forcible inspection of item during the electrical safety of China measurement Law regulation detects, and in order to ensure device security reliability service, in the debugging of electrical equipment and electronic installation, maintenance process, verifying insulation resistance is one of important step.Simultaneously, general main equipment all will do regular insulation inspection, especially for off-gauge specific use equipment, by measuring the insulation resistance situation of discovering device insulator damage in time, such as making moist, the phenomenon such as aging and penetrability defect, therefore the measurement of insulation resistance value is had great significance, apply very extensive.
In order to measure the insulation resistance value of various insulator arrangements (comprising capacitive apparatus), domestic insulation tester uses traditional measuring method mostly, and the method exists measurement Standard resistance range little, and precision is low, can not carry out to resistance the problems such as continuous coverage.Thereby whole system compatibility is poor, does not only relate to the timely preservation to measurement data, and there is no voltage gear automatic switching function for different resistances.
Utility model content
The purpose of this utility model is to provide a kind of Intelligent insulation resistance meter, can export different electric pressures for different measurement resistances, thereby be applicable to the use of the resistance test of the equipment such as transformer, isolating switch, capacitor.
A kind of Intelligent insulation resistance meter, its special feature is: comprise microprocessor, this microprocessor is connected with the input end of inverter circuit by PWM pulse-width modulation circuit, thereby the PWM ripple that produces two-way complementation promotes inverter in the mode of recommending DC voltage is become to alternating voltage, and the output terminal of this inverter circuit and the input end of voltage doubling rectifing circuit are connected, this voltage doubling rectifing circuit is carried out rectifying and wave-filtering and is exported as negative high voltage signal source after the alternating voltage multiplication of voltage of input is amplified, two ends in this negative high voltage signal source are in series with current-limiting resistance successively, measured resistance and sample resistance unit, and one end of this sample resistance unit is also connected with aforesaid microprocessor by signal condition module, thereby the voltage signal of collection is delivered to microprocessor.
Wherein signal condition module adopts A/D change-over circuit.
Wherein also be parallel with diode at current-limiting resistance two ends.
Wherein microprocessor is connected with man-machine interface.
Wherein microprocessor adopts single-chip microcomputer.
Wherein sample resistance unit adopts the resistor group being made up of 8 resistance, one end of these 8 resistance is all connected with one end of negative high voltage signal source, and the other end of these 8 resistance is connected with signal condition module by analog switch respectively, and the control end of this analog switch is connected with described microprocessor, thereby can between 8 resistance, switch.
The utlity model has following beneficial effect: can be according to the difference automatic switchover sample resistance of test resistance value, can export four kinds of different electric pressures, test resistance scope is large, it is high that this tester also has measuring accuracy, error is little, easy to operate, the advantages such as good stability, provide guarantee reliably for measuring the insulating property of electric equipment.
Accompanying drawing explanation
Accompanying drawing 1 is circuit theory diagrams of the present utility model;
Accompanying drawing 2 is logic theory block diagram of the present utility model;
Accompanying drawing 3 is the main control process flow diagram of microprocessor in the utility model.
Embodiment
As Fig. 1, shown in 2, the utility model comprises microprocessor, this microprocessor is connected with the input end of inverter circuit by PWM pulse-width modulation circuit, thereby the PWM ripple that produces two-way complementation promotes inverter in the mode of recommending DC voltage is become to alternating voltage, and the output terminal of this inverter circuit and the input end of voltage doubling rectifing circuit are connected, this voltage doubling rectifing circuit is carried out rectifying and wave-filtering and is exported as negative high voltage signal source after the alternating voltage multiplication of voltage of input is amplified, two ends in this negative high voltage signal source are in series with current-limiting resistance successively, measured resistance and sample resistance unit, and one end of this sample resistance unit is also connected with aforesaid microprocessor by signal condition module, thereby the voltage signal of collection is delivered to microprocessor.
Wherein signal condition module adopts A/D change-over circuit.Sample resistance unit adopts the resistor group being made up of 8 resistance, one end of these 8 resistance is all connected with one end of negative high voltage signal source, and the other end of these 8 resistance is connected with signal condition module by analog switch respectively, and the control end of this analog switch is connected with described microprocessor, thereby can between 8 resistance, switch.Also be parallel with diode at current-limiting resistance two ends in addition.Microprocessor adopts single-chip microcomputer in addition, and it is also connected with man-machine interface, and man-machine interface comprises liquid crystal display, keyboard, voice module, printer.
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated: Fig. 1 is Intelligent insulation resistance meter schematic diagram of the present utility model.
As shown in Figure 1: mainly by control module 2, signal condition module 1; 3, sample resistance unit; 4, outside reference voltage source; 5, the part such as negative high voltage signal source composition.Control module is take MSP430F149 single-chip microcomputer as core, the signal of being responsible for signal condition module to send into carries out data processing, signal condition module is taked A/D conversion to E point voltage signal, reference voltage source provides the voltage of 4V for G point, sample resistance unit is made up of 8 different precision resistances of resistance, single-chip microcomputer can regulate sample resistance according to different test resistances by analog switch, guarantee that the E voltage of ordering is between 0.5V-3.5V, negative high voltage signal source provides the negative high voltage of four grades for test loop.Having realized so the continuous resistance of insulation resistance measures.
What the method for testing of insulation resistance adopted is electric current and voltage method, and current and voltage method is exactly the voltage U consuming according to sample resistance
outcalculate the resistance of insulation resistance with the ratio of the electric current in loop.As shown in Figure 1, R
0for the resistance of current-limiting resistance, R
xfor the resistance of measured resistance, R
mfor the resistance of sample resistance unit, U
outthe voltage that sample resistance consumes, U
infor the negative high voltage DC input voitage of test loop.Therefore obtain insulation resistance R
xcomputing formula:
Figure 2 shows that the hardware block diagram of Intelligent insulation resistance meter, power module provides suitable voltage to whole system, negative high voltage DC circuit is made up of PWM pulse-width modulation circuit, inverter circuit, voltage doubling rectifing circuit, the pulsewidth of PWM ripple by changing the output of TL494 chip is with push pull mode driven MOS pipe, carries out circuit realizations-500V ,-1000V after 6 voltage multiplying rectifiers ,-2500V, tetra-different electric pressures of-5000V are exported after high-frequency transformer suitably amplifies again.
Control module comprises MSP430F149 single-chip microcomputer, and connected liquid crystal display, serially printing, by function device compositions such as key control, voice messages, realize the demonstration in real time of test resistance, data processing, data-printing and sound prompt function.In the time that single-chip microcomputer detects that test loop is short-circuited, can turn-off rapidly the output of PWM ripple, guarantee the safety of people and equipment.
Intelligent insulating resistance meter of the present utility model work is as follows: as shown in Figure 1, first connect product to be tested at L and 2 of E, then to " test voltage ", " test duration " carries out the setting of parameter, start test when pressing test/start button, the electric pressure that the output of negative high voltage DC circuit is set, the magnitude of voltage sampling that single-chip microcomputer is ordered to E simultaneously, in the time that sampled voltage is between 0.5-3.5V scope, single-chip microcomputer calculates resistance and shows real-time measurement result at liquid crystal display, locking test result cutoff high output after the test duration completes, then whether prompting prints.In the time that sampled value is less than 0.5V, Single-chip Controlling analog switch is selected less resistance value, and in the time that sampled value is greater than 3.5V, analog switch is selected larger resistance value.
Claims (6)
1. an Intelligent insulation resistance meter, it is characterized in that: comprise microprocessor, this microprocessor is connected with the input end of inverter circuit by PWM pulse-width modulation circuit, thereby the PWM ripple that produces two-way complementation promotes inverter in the mode of recommending DC voltage is become to alternating voltage, and the output terminal of this inverter circuit and the input end of voltage doubling rectifing circuit are connected, this voltage doubling rectifing circuit is carried out rectifying and wave-filtering and is exported as negative high voltage signal source after the alternating voltage multiplication of voltage of input is amplified, two ends in this negative high voltage signal source are in series with current-limiting resistance successively, measured resistance and sample resistance unit, and one end of this sample resistance unit is also connected with aforesaid microprocessor by signal condition module, thereby the voltage signal of collection is delivered to microprocessor.
2. Intelligent insulation resistance meter as claimed in claim 1, is characterized in that: wherein signal condition module adopts A/D change-over circuit.
3. Intelligent insulation resistance meter as claimed in claim 1, is characterized in that: be wherein also parallel with diode at current-limiting resistance two ends.
4. Intelligent insulation resistance meter as claimed in claim 1, is characterized in that: wherein microprocessor is connected with man-machine interface.
5. Intelligent insulation resistance meter as claimed in claim 1, is characterized in that: wherein microprocessor adopts single-chip microcomputer.
6. the Intelligent insulation resistance meter as described in any one in claim 1 to 5, it is characterized in that: wherein sample resistance unit adopts the resistor group being made up of 8 resistance, one end of these 8 resistance is all connected with one end of negative high voltage signal source, and the other end of these 8 resistance is connected with signal condition module by analog switch respectively, and the control end of this analog switch is connected with described microprocessor, thereby can between 8 resistance, switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320844411.XU CN203616394U (en) | 2013-12-20 | 2013-12-20 | An intelligent insulation resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320844411.XU CN203616394U (en) | 2013-12-20 | 2013-12-20 | An intelligent insulation resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203616394U true CN203616394U (en) | 2014-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320844411.XU Expired - Fee Related CN203616394U (en) | 2013-12-20 | 2013-12-20 | An intelligent insulation resistance tester |
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| CN (1) | CN203616394U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405244A (en) * | 2016-11-11 | 2017-02-15 | 云南电网有限责任公司西双版纳供电局 | Novel digital megger with automatic phase-shift measurement |
| CN106896274A (en) * | 2015-12-18 | 2017-06-27 | 马涅蒂-马瑞利公司 | For the devices, systems and methods that insulation measurement and insulation loss are diagnosed |
| CN107300648A (en) * | 2017-06-16 | 2017-10-27 | 国家电网公司 | Insulation Resistance of Transformer, absorptance simulation and training device |
| CN107976575A (en) * | 2016-10-23 | 2018-05-01 | 重庆邮电大学 | A kind of type insulation monitoring system of electric automobile |
| CN108196124A (en) * | 2017-12-29 | 2018-06-22 | 河南北瑞电子科技有限公司 | A kind of machine winding insulation resistance on-line detecting system |
| CN109839578A (en) * | 2018-05-07 | 2019-06-04 | 广东电网有限责任公司 | A kind of portable insulating rod insulation performance test instrument |
| CN114545165A (en) * | 2022-02-21 | 2022-05-27 | 青岛艾测科技有限公司 | High-voltage insulation detection device special for capacitive load |
-
2013
- 2013-12-20 CN CN201320844411.XU patent/CN203616394U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896274A (en) * | 2015-12-18 | 2017-06-27 | 马涅蒂-马瑞利公司 | For the devices, systems and methods that insulation measurement and insulation loss are diagnosed |
| CN106896274B (en) * | 2015-12-18 | 2020-10-27 | 马涅蒂-马瑞利公司 | Apparatus, system and method for insulation resistance measurement and insulation loss diagnosis |
| CN107976575A (en) * | 2016-10-23 | 2018-05-01 | 重庆邮电大学 | A kind of type insulation monitoring system of electric automobile |
| CN106405244A (en) * | 2016-11-11 | 2017-02-15 | 云南电网有限责任公司西双版纳供电局 | Novel digital megger with automatic phase-shift measurement |
| CN107300648A (en) * | 2017-06-16 | 2017-10-27 | 国家电网公司 | Insulation Resistance of Transformer, absorptance simulation and training device |
| CN107300648B (en) * | 2017-06-16 | 2023-10-17 | 国家电网公司 | Transformer insulation resistance and absorption ratio simulation training device |
| CN108196124A (en) * | 2017-12-29 | 2018-06-22 | 河南北瑞电子科技有限公司 | A kind of machine winding insulation resistance on-line detecting system |
| CN109839578A (en) * | 2018-05-07 | 2019-06-04 | 广东电网有限责任公司 | A kind of portable insulating rod insulation performance test instrument |
| CN114545165A (en) * | 2022-02-21 | 2022-05-27 | 青岛艾测科技有限公司 | High-voltage insulation detection device special for capacitive load |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140528 Termination date: 20171220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |