CN202305675U - Insulation resistance detection device - Google Patents
Insulation resistance detection device Download PDFInfo
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- CN202305675U CN202305675U CN2011203681995U CN201120368199U CN202305675U CN 202305675 U CN202305675 U CN 202305675U CN 2011203681995 U CN2011203681995 U CN 2011203681995U CN 201120368199 U CN201120368199 U CN 201120368199U CN 202305675 U CN202305675 U CN 202305675U
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- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000009413 insulation Methods 0.000 title claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 230000002459 sustained effect Effects 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The utility model discloses an insulation resistance detection device which includes a driving control circuit. The driving control circuit loads a detection power supply of a detection signal circuit to a detected object. A feedback signal circuit acquires a feedback signal of a detection current or voltage. The feedback signal is connected with an AD acquisition terminal of a microprocessor via a signal amplifying circuit. The insulation resistance detection device has the advantages of wide application scope, excellent protection performance, high reliability, and less protective circuit components.
Description
Technical field
The utility model relates to the Electromechanical Control technical field, specifically is to detect to HVDC or alternating-current electric system cable insulating property, realizes the method that insulation resistance detects.
Background technology
Application along with high pressure electricity consumption system; Electrical system is generally higher direct current or working volts alternating current; The Electrical Safety design of electrical system is mainly one of to deal with problems, and higher WV is had higher requirement to the insulating property between electrical system and the apparatus casing.Factors such as the high-voltage cable insulating medium is aging or receive that wet environment influences all can cause the decreasing insulating between high-tension circuit and the housing; The power positive cathode lead-in wire will constitute the leakage current loop through insulation course and housing; The housing current potential is risen; Not only entail dangers to personal safety, and will influence the operate as normal of electrical system.When generation multiple spot insulating property seriously descend between high voltage circuit and the housing, also can cause the heat accumulation effect of loop of electric leakage, may cause electrical fire.Therefore, the relative electrical insulation properties of high-voltage electric system is the core content of Safety Design, and electricity consumption personnel, electrical equipment operate as normal are all had the meaning of outbalance.
Summary of the invention
The purpose of the utility model provides a kind of reliable insulation resistance testing circuit, and this device can detect the insulating resistance value of electric loop and housing, realizes the Electrical Safety protection.
For realizing above-mentioned purpose; The utility model has adopted following technical scheme following: a kind of insulation resistance pick-up unit; It is characterized in that: device comprises Drive and Control Circuit; The detection power supply that Drive and Control Circuit drives the detection signal circuit is loaded on detected object, and the feedback signal of feedback signal circuit acquisition testing curtage, this feedback signal connect the AD collection terminal of microprocessor through discharge circuit.
Can know by technique scheme; Adopt testing circuit control DC voltage or current detection signal to be applied to electric loop; And carry out current limliting through setting resistance, and through DC current sensor or relevant sensor the curtage that detects the loop is measured then, obtain the corresponding electric signal in loop; After microprocessor samples; Can calculate the insulation resistance of electric loop according to current signal and the detection supply voltage that applies, compare judgement, realize that insulation resistance detects and defencive function with the safeguard protection value of setting to housing.
The utlity model has following advantage: 1, applied widely---can realize that interchange or direct current, different electric pressure electric loop are carried out insulation resistance to be detected; 2, protection is flexibly---can design different protection threshold values according to the insulation resistance that detects; 3, protection feature is good--and-the method can be carried out early warning in advance when cable insulation drops to a certain degree, avoid personnel's Danger Electric shock risk; 4, high reliability--the holding circuit components and parts are few, do not have complicated components and parts.
Description of drawings
Fig. 1 is the theory diagram of the utility model;
Fig. 2 is circuit theory diagrams.
Embodiment
In conjunction with Fig. 1; The insulation resistance pick-up unit; Device comprises Drive and Control Circuit 20; The detection power supply that Drive and Control Circuit 20 drives detection signal circuit 10 is loaded on detected object 30, and the feedback signal of feedback signal circuit 40 acquisition testing curtages, this feedback signal connect the AD collection terminal of microprocessor 70 through signal Processing amplifying circuit 50.
In conjunction with Fig. 2; The control signal output ends of described microprocessor 70 is connected to Drive and Control Circuit 20 via photoelectric isolating circuit 60; The power supply of detection signal circuit 10 is connected to detected object 30 through relay J 1 contact after via current sensor T1 again; Specifically be exactly that the DC60V detection signal passes current sensor T1 after be connected to relay J 1 contact one end behind current-limiting resistance R1 and the direction diode D1; Object is surveyed in the reception of the relay contact other end; The signal output part of current sensor T1 links to each other with the input end of signal Processing amplifying circuit 50, and the amplifying signal of signal Processing amplifying circuit 50 connects the AD sample port of microprocessor 70 behind filtering circuit, specifically is exactly current sensor T1 signal output part and accesses kind resistance R 2 and filter capacitor C3; Current signal links to each other with the input end R6 of signal Processing amplifying circuit 50, and amplifying signal connects the AD sample port of microprocessor behind the RC filtering circuit of R8 and C4 formation.
The negative electrode that constitutes the optocoupler U1 of photoelectric isolating circuit 60 connects the control signal of microprocessor 70; The anode of optocoupler U1 connects microprocessor 70 control power Vcc through R10; Capacitor C 1 and resistance R 5 are connected in parallel on the antijamming capability that can improve circuit between negative electrode and the anode of U1; The collector of optocoupler U1 is through the control power supply Vin of resistance R 4 to Drive and Control Circuit 20; The emitter of optocoupler U1 connects the base stage of the triode Q5 that constitutes Drive and Control Circuit 20, and resistance R 3 and capacitor C 2 are connected in parallel on the antijamming capability that has improved circuit on the base stage of triode Q5, collector connecting relay J1 coil one end of triode Q5; The other termination drive control power supply Vin of relay coil, sustained diode 2 is connected in parallel on relay J 1 coil two ends.
Below specify the detection principle.
The insulation resistance pick-up unit adopts accessory power supply to produce the DC60V detection signal; Detection signal negative pole body contact body; Detection signal DC60V is anodal through current-limiting resistance R1 current limliting, and serial connection diode D1 passes DC current transformer T1; Suspension control signal IO control is applied to detected object, utilizes T1 acquisition feedback current or voltage signal behind sample resistance R2, to get feedback signal V
o, after feedback signal is amplified through operational amplification circuit, be connected to the AD sample port of microprocessor, suppose that the insulation resistance between electric loop and the housing is R, then have according to Ohm law:
---formula (1)
V
D------The conduction voltage drop of diode D1;
k
------The coefficient of current sensor T1;
According to formula (1), can get the computing formula of insulation resistance R:
It should be noted that when detection signal is applied between electric loop and the housing, itself be equivalent to reduce the insulating property of electric loop, the problem of bringing in the time of therefore will considering to detect.The present invention adopts the DC60V direct current detection voltage back; And carry out current limliting through resistance, and guarantee the security when insulation resistance detects, realize simultaneously that detection signal is applied to through relay control to detect the loop; Can realize that any time detects, not influence the electrical system insulating property after having detected.
Claims (3)
1. insulation resistance pick-up unit; It is characterized in that: device comprises Drive and Control Circuit (20); The detection power supply that Drive and Control Circuit (20) drives detection signal circuit (10) is loaded on detected object (30); The feedback signal of feedback signal circuit (40) acquisition testing curtage, this feedback signal connect the AD collection terminal of microprocessor (70) through signal Processing amplifying circuit (50).
2. insulation resistance pick-up unit according to claim 1; It is characterized in that: the control signal output ends of described microprocessor (70) is connected to Drive and Control Circuit (20) via photoelectric isolating circuit (60); The power supply of detection signal circuit (10) is connected to detected object (30) through relay J 1 contact after via current sensor T1 again; The signal output part of current sensor T1 links to each other with the input end of signal Processing amplifying circuit (50), and the amplifying signal of signal Processing amplifying circuit (50) connects the AD sample port of microprocessor (70) behind filtering circuit.
3. insulation resistance pick-up unit according to claim 2; It is characterized in that: the negative electrode that constitutes the optocoupler U1 of photoelectric isolating circuit (60) connects the control signal of microprocessor (70); The anode of optocoupler U1 connects microprocessor (70) control power Vcc through R10; Capacitor C 1 and resistance R 5 are connected in parallel between the negative electrode and anode of U1, and the collector of optocoupler U1 is through the control power supply Vin of resistance R 4 to Drive and Control Circuit (20), and the emitter of optocoupler U1 connects the base stage of the triode Q5 that constitutes Drive and Control Circuit (20); Resistance R 3 is connected in parallel on the base stage of triode Q5 with capacitor C 2; Collector connecting relay J1 coil one end of triode Q5, the other termination drive control power supply Vin of relay coil, sustained diode 2 is connected in parallel on relay J 1 coil two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203681995U CN202305675U (en) | 2011-09-30 | 2011-09-30 | Insulation resistance detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203681995U CN202305675U (en) | 2011-09-30 | 2011-09-30 | Insulation resistance detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305675U true CN202305675U (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203681995U Expired - Lifetime CN202305675U (en) | 2011-09-30 | 2011-09-30 | Insulation resistance detection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202305675U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884920A (en) * | 2014-03-20 | 2014-06-25 | 吉林大学 | Automatic frequency sweeping inductance measuring meter and measuring method |
-
2011
- 2011-09-30 CN CN2011203681995U patent/CN202305675U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884920A (en) * | 2014-03-20 | 2014-06-25 | 吉林大学 | Automatic frequency sweeping inductance measuring meter and measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HEFEI TONGZHI ELECTROMECHANICAL CONTROL TECHNOLOGY Free format text: FORMER NAME: HEFEI TONGZHI ELECTRICAL CONTROL TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 230088 No. 66 Yonghe Road, hi tech Zone, Anhui, Hefei Patentee after: HEFEI TONGZHI ELECTRICAL CONTROL TECHNOLOGY CO., LTD. Address before: High tech Zone Hefei city Anhui province 230088 Tianzhi Road No. 19 Patentee before: Hefei Tongzhi Electrical Control Technology Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |