CN204101671U - A kind of Novel multi-core cable tester - Google Patents
A kind of Novel multi-core cable tester Download PDFInfo
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- CN204101671U CN204101671U CN201420469703.4U CN201420469703U CN204101671U CN 204101671 U CN204101671 U CN 204101671U CN 201420469703 U CN201420469703 U CN 201420469703U CN 204101671 U CN204101671 U CN 204101671U
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Abstract
The utility model discloses a kind of Novel multi-core cable tester, it is characterized in that: the keyboard comprising single-chip microcomputer and be connected with single-chip microcomputer input end, A/D modular converter and on off test circuit, single-chip microcomputer output terminal connects CPLD circuit system, LCD Liquid Crystal Module and printer, A/D modular converter input end connects insulation test circuit, CPLD circuit system output terminal connects relay group, described relay group also connects power supply, described insulation test circuit is by sampling section, amplifier part and AD7705A/D converter unit are grouped into, described on off test circuit is by the test resistance be connected successively, relay array and cable core composition.The tester of the present utility model combination of 51 single-chip microcomputers and CPLD chip, both ensure that the accuracy of test result, again can by test result from LCDs and printer output.Avoid the error of manual measurement, greatly increase work efficiency.
Description
Technical field
The utility model relates to telecommunication cable detection technique field, especially relates to a kind of Novel multi-core cable tester.
Background technology
Miscellaneous communication cable, control cables use in a large number in various instrument and opertaing device.Whether the whether good conducting of cable, wire insulation resistance meet the demands, and directly have influence on the normal operation of electric equipment.Withstand voltage insulation resistance is the important indicator weighing insulating material performance.The method major defect that insulation resistance measured by traditional megger has: measuring error is large, can not ensure the accuracy of voltage-withstand test high-voltage power supply; Measurement result cannot be preserved and printout automatically; To in insulation measurement between polycore cable heart yearn, loaded down with trivial details, the easy wrong of changing-over line, manual labor amount are large.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, a kind of Novel multi-core cable tester is provided, the tester of the present utility model combination of 51 single-chip microcomputers and CPLD chip, devising one, to have test speed fast, control flexibly, on off test and the Insulation test requirement of different core number cable can be adapted to, the test macro intelligent and automaticity is higher, can realize the automatic measurement being 48 core cable break-makes and withstand voltage insulation resistance value to the maximum, both ensure that the accuracy of test result, again can by test result from LCDs and printer output.Avoid the error of manual measurement, greatly increase work efficiency.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of Novel multi-core cable tester, it is characterized in that: the keyboard comprising single-chip microcomputer and be connected with single-chip microcomputer input end, A/D modular converter and on off test circuit, described single-chip microcomputer output terminal connects CPLD circuit system, LCD Liquid Crystal Module and printer, described A/D modular converter input end connects insulation test circuit, described CPLD circuit system output terminal connects relay group, described relay group also connects power supply, described insulation test circuit is by sampling section, amplifier part and AD7705A/D converter unit are grouped into, described on off test circuit is by the test resistance be connected successively, relay array and cable core composition.
Above-mentioned a kind of Novel multi-core cable tester, is characterized in that: described power supply is 500VDC power supply.
Above-mentioned a kind of Novel multi-core cable tester, is characterized in that: described single-chip microcomputer is 8051 single-chip microcomputers.
Above-mentioned a kind of Novel multi-core cable tester, is characterized in that: the MAX7000s chip of described CPLD circuit system ALTERA company.
The utility model compared with prior art has the following advantages:
The tester of the present utility model combination of 51 single-chip microcomputers and CPLD chip, devise a kind ofly have that test speed is fast, the on off test that controls flexibly, can adapt to different core number cable and Insulation test requires, intelligent and automaticity is higher test macro, can realize the automatic measurement being 48 core cable break-makes and withstand voltage insulation resistance value to the maximum, both ensure that the accuracy of test result, again can by test result from LCDs and printer output.Avoid the error of manual measurement, greatly increase work efficiency.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is multi-core cable tester principle of work block diagram of the present utility model;
Fig. 2 is insulation test circuit circuit theory diagrams of the present utility model;
Fig. 3 is cable on off test circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, a kind of Novel multi-core cable tester, it is characterized in that: the keyboard 2, A/D modular converter 5 and the on off test circuit 4 that comprise single-chip microcomputer 1 and be connected with single-chip microcomputer 1 input end, described single-chip microcomputer 1 output terminal connects CPLD circuit system 6, LCD Liquid Crystal Module 8 and printer 10, described A/D modular converter 5 input end connects insulation test circuit 3, described CPLD circuit system 6 output terminal connects relay group 7, described relay group 7 also connects power supply 9, described power supply 9 is 500VDC power supply, and described single-chip microcomputer 1 is 8051 single-chip microcomputers.
As shown in Figure 2, in the present embodiment, described insulation test circuit 3 is grouped into by sampling section, amplifier part and AD7705A/D converter unit.The core devices of megger test is AD7705, and it is 16 sigma-delta A/D converters that AD company releases, and can be used for measuring low-frequency analog signal.AD7705, with programmable-gain amplifier, carrys out the various tiny signals of direct survey sensor output by software programming.AD7705 has the features such as resolution is high, dynamic range wide, self calibration, is thus very suitable for high-precision detection and measurement.AD7705 has two fully differential input channels, and its principal feature is as follows: have 16 without losing code; Nonlinearity is 0.0003%; Self calibration and system calibration can be carried out; With three line SPI serial line interfaces; Low in energy consumption etc.
The concrete test process of insulation resistance is as follows: in fig. 2, and Rx is the insulation resistance value of tested cable.First 500VDC is served during test, then closing relay S1 and S2.500VDC, by delivering to amplifier after R2 and R3 dividing potential drop, delivers to the ADref end of AD7705 again, as the test reference voltage of AD7705, to eliminate the impact of 500VDC power-supply fluctuation on test result after amplifier conditioning.Voltage after Rx and R1 dividing potential drop delivers to the ADin end delivering to AD7705 after amplifier is nursed one's health as Insulation test sampled voltage.The voltage that ADin holds is the voltage that actual samples obtains, and its scope is 0 ~ 2.5V, and the resistance of insulation resistance is less, and corresponding sampled voltage is higher.
As shown in Figure 3, in the present embodiment, described on off test circuit 4 is made up of the test resistance be connected successively, relay array and cable core.Before starting break-make detection, should first with all heart yearn short circuits of short-circuited conducting sleeve by cable one end, the other end is received on relay array.Relay array is used for carrying out access to the heart yearn of cable and switches, and all heart yearns pass through the normally closed contact of corresponding relay through resistance R1 and R2 ground connection.When detecting 1# heart yearn, closed S1 relay, the normally opened contact of relay S1 is closed, and+15V is added on resistance R1 and R2 by heart yearn, after R1 and R2 dividing potential drop, deliver to single-chip microcomputer.If survey heart yearn open circuit, then Vo is 0V, otherwise Vo is+5V.
Test macro maximum detection streamer core number is 48.51 single-chip microcomputers have 24 I/O ports, if direct single-chip microcomputer carrys out pilot relay group, then the expansion that single-chip microcomputer must utilize extended chip to carry out I/O port could meet system requirements, as 8255 etc., this will increase the complicacy of system, so determine to adopt CPLD to carry out pilot relay group.CPLD is a kind of user-programmable logic device of complexity.The present embodiment adopts the MAX7000s of ALTERA company, it is based on the high precision of second generation MAX structure, high-performance, in systems in which programmable CPLD chip, employing advanced CMOS technologies processes, include electricallyerasable ROM (EEROM) EPROM, 600-5000 available strobe pin, ISP, speed can be provided only to have the delay of 5ns and frequency can reach the high-speed counter of 175.4MHz.
Native system produces the test voltage source of direct supply as insulation resistance of 500V by high-tension circuit, and the measurement of insulation resistance adopts the weighing apparatus platen press of national regulation.During test, first by the core numerical value of keyboard to set up cable to be tested.Single-chip microcomputer realizes the closed control with disconnecting to relay group by CPLD system, then to be changed by A/D or signal is converted to digital signal by off test circuit, single-chip microcomputer gathers signal, result after calculation process shows measurement result by LCD liquid crystal display, printer, data-carrier store, export and preserved.
This system has more complete function, and concrete function is as follows: the function of (1) detection streamer break-make and insulation resistance; (2) start self-diagnostic function; (3) the real-time Presentation Function of test result; (4) automatic switching function of cable core, detects after starting, the automatic decision whether insulation resistance between the break-make of automatic switchover detection streamer every root heart yearn and each heart yearn and insulation resistance value meet the demands; (5) function of cable core core number to be checked is set; (6) insulation resistance transfinites value set-up function, may be used for the judgement that whether qualified the insulation resistance value of different brackets is.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solutions of the utility model.
Claims (4)
1. a Novel multi-core cable tester, it is characterized in that: the keyboard (2) comprising single-chip microcomputer (1) and be connected with single-chip microcomputer (1) input end, A/D modular converter (5) and on off test circuit (4), described single-chip microcomputer (1) output terminal connects CPLD circuit system (6), LCD Liquid Crystal Module (8) and printer (10), described A/D modular converter (5) input end connects insulation test circuit (3), described CPLD circuit system (6) output terminal connects relay group (7), described relay group (7) also connects power supply (9), described insulation test circuit (3) is by sampling section, amplifier part and AD7705A/D converter unit are grouped into, described on off test circuit (4) is by the test resistance be connected successively, relay array and cable core composition.
2. according to a kind of Novel multi-core cable tester according to claim 1, it is characterized in that: described power supply (9) is 500VDC power supply.
3. according to a kind of Novel multi-core cable tester according to claim 1, it is characterized in that: described single-chip microcomputer (1) is 8051 single-chip microcomputers.
4. according to a kind of Novel multi-core cable tester according to claim 1, it is characterized in that: described CPLD circuit system (6) uses the MAX7000s chip of ALTERA company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420469703.4U CN204101671U (en) | 2014-08-19 | 2014-08-19 | A kind of Novel multi-core cable tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420469703.4U CN204101671U (en) | 2014-08-19 | 2014-08-19 | A kind of Novel multi-core cable tester |
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| Publication Number | Publication Date |
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| CN204101671U true CN204101671U (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420469703.4U Expired - Fee Related CN204101671U (en) | 2014-08-19 | 2014-08-19 | A kind of Novel multi-core cable tester |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223461A (en) * | 2015-09-25 | 2016-01-06 | 长治清华机械厂 | A kind of polycore cable insulation, short-circuit detecting device and method |
| CN108535586A (en) * | 2018-04-18 | 2018-09-14 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of watertight cable pressure pot experiment automatic checkout system |
| CN108761205A (en) * | 2018-05-21 | 2018-11-06 | 中国电建集团河南工程有限公司 | Cable through and the test method and tester of insulation |
| CN109725243A (en) * | 2018-11-16 | 2019-05-07 | 湖北江山重工有限责任公司 | Multicore cable insulating properties self-operated measuring unit |
| CN112540225A (en) * | 2020-11-06 | 2021-03-23 | 广西电网有限责任公司南宁供电局 | Testing device and testing method for secondary loop insulation resistance |
| CN116840742A (en) * | 2023-08-11 | 2023-10-03 | 南京理工大学 | Multi-core cable detection device and use method thereof |
-
2014
- 2014-08-19 CN CN201420469703.4U patent/CN204101671U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223461A (en) * | 2015-09-25 | 2016-01-06 | 长治清华机械厂 | A kind of polycore cable insulation, short-circuit detecting device and method |
| CN108535586A (en) * | 2018-04-18 | 2018-09-14 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of watertight cable pressure pot experiment automatic checkout system |
| CN108761205A (en) * | 2018-05-21 | 2018-11-06 | 中国电建集团河南工程有限公司 | Cable through and the test method and tester of insulation |
| CN109725243A (en) * | 2018-11-16 | 2019-05-07 | 湖北江山重工有限责任公司 | Multicore cable insulating properties self-operated measuring unit |
| CN109725243B (en) * | 2018-11-16 | 2020-09-29 | 湖北江山重工有限责任公司 | Multi-core cable insulation automatic measuring device |
| CN112540225A (en) * | 2020-11-06 | 2021-03-23 | 广西电网有限责任公司南宁供电局 | Testing device and testing method for secondary loop insulation resistance |
| CN116840742A (en) * | 2023-08-11 | 2023-10-03 | 南京理工大学 | Multi-core cable detection device and use method thereof |
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Legal Events
| Date | Code | Title | Description |
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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: 20150114 Termination date: 20150819 |
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| EXPY | Termination of patent right or utility model |