CN203894331U - Adjustable high-voltage digital megohm meter - Google Patents
Adjustable high-voltage digital megohm meter Download PDFInfo
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- CN203894331U CN203894331U CN201420155860.8U CN201420155860U CN203894331U CN 203894331 U CN203894331 U CN 203894331U CN 201420155860 U CN201420155860 U CN 201420155860U CN 203894331 U CN203894331 U CN 203894331U
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- circuit
- electrically connected
- converter
- adjustable high
- high pressure
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Abstract
The utility model discloses an adjustable high-voltage digital megohm meter. The digital megohm meter comprises a transformer. The input end of the transformer is connected with a power supply circuit. The output end of the transformer is in series connected with a diode, an inductor and a capacitor. The capacitor is in parallel connection with a voltage amplifier circuit. The output end of the voltage amplifier circuit is connected with a bridge. The output end of the bridge is electrically connected with a DC/DC converter. The DC/DC converter is electrically connected with a CPU through an AD converter and an isolation circuit. The CPU is electrically connected with a display, a timing circuit and an alarm circuit respectively. The output end of the alarm circuit is electrically connected with a sampling circuit. The AD converter is electrically connected with the sampling circuit. The sampling circuit is installed at a resistor to be tested. The digital megohm meter employs the frequency conversion power supply technology, carries out automatic frequency conversion, analog-to-digital conversion and data operation by utilization of a one-chip microcomputer and the modernized electronic technology, and achieves high anti-interference, rapid rate, high precision and automatic digitization effects.
Description
Technical field
The utility model relates to a kind of adjustable high pressure numerical megger, belongs to tester technical field.
Background technology
High voltage substation, under the on-the-spot strong jamming in generating plant to Large-scale High-Pressure transformer, electrical equipment and electrical, remote power cable or to bury cable etc. underground electric be all that high-pressure work is electric, and often with power frequency, leak or the upper high pressure interference of induction electric energy, therefore the electric characteristic test of carrying out insulation resistance for these places is very important, the measurement of traditional insulation resistance adopts: the method for first measuring according to megohmmeter connects circuit everywhere, measure traverse line is relatively applicable to adopting magetic indicator joint or clip with being connected of pipeline, rotation megohmmeter handle reaches the rotating speed of regulation, continue 10 seconds, the resistance value of the stable indication of megohmmeter is the insulating resistance value of isolating joint.This method of testing security is not high, and the efficiency of test is low, poor anti jamming capability; Therefore,, for overcoming the above problems, urgently research and develop a kind of new adjustable high pressure numerical megger.
Summary of the invention
(1) technical matters that will solve
In order to address the above problem, the utility model proposes that a kind of antijamming capability is strong, the higher and easy to operate adjustable high pressure numerical megger of precision.
(2) technical scheme
Adjustable high pressure numerical megger of the present utility model, comprises transformer; Described transformer input end access power circuit; Its output terminal is serially connected with diode, inductance and electric capacity, with the diode of transformers connected in parallel be fly-wheel diode, in circuit, be generally used for the not sensed voltage breakdown of protecting component or burn out, inductance is energy storage filter inductance, electric capacity is energy storage filter capacitor; Described electric capacity is also connected to voltage amplifier circuit; The output terminal of described voltage amplifier circuit is connected with electric bridge; The output terminal of described electric bridge is electrically connected with DC/DC converter; Described DC/DC converter is electrically connected to CPU by AD converter by buffer circuit; Described CPU is electrically connected to respectively display, timing circuit and warning circuit; The output terminal of described warning circuit is also electrically connected with sample circuit; Described AD converter is also electrically connected with sample circuit; Described sample circuit is installed on testing resistance place.
Preferably, described transformer adopting switch transformer, it adopts the topological structure of positive activation type.
Further, described buffer circuit function photoelectric isolating circuit.
Further, described display is three and half LCD digital watches.
Further, in described power circuit, be provided with 220V floating charge power supply; Also be provided with 10 rechargeable Ni-H 2 batteries of 12V altogether.
Further, described warning circuit is comprised of hummer and crystal oscillating circuit; Described timing circuit is comprised of crystal oscillator and electric capacity.
Further, described AD converter is double integrator A/D convertor circuit.
Preferably, described voltage amplifier circuit is push-pull amplifier circuit, and the output stage of push-pull amplifier circuit had both improved the load capacity of circuit, can improve switching speed again.
(3) beneficial effect
Compared with prior art, it has following beneficial effect to the utility model: adjustable high pressure numerical megger of the present utility model, adopt variable-frequency power sources technology, and utilize single-chip microcomputer and modernized electronic technique to carry out automatic frequency conversion, analog to digital conversion and data operation; Reach the effect of strong anti-interference, rapid rate, high precision and Full-automatic digital.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
As shown in Figure 1, adjustable high pressure numerical megger of the present utility model, comprises transformer T; Described transformer T input end access power circuit Ui; Its output terminal is serially connected with diode D
1, D
2, inductance L and capacitor C, the diode D in parallel with transformer T
2for fly-wheel diode, in circuit, be generally used for the not sensed voltage breakdown of protecting component or burn out, inductance L is energy storage filter inductance, capacitor C is energy storage filter capacitor; Described capacitor C is also connected to voltage amplifier circuit U; The output terminal of described voltage amplifier circuit U is connected with electric bridge Q; The output terminal of described electric bridge Q is electrically connected with DC/DC converter; Described DC/DC converter is electrically connected to CPU by AD converter by buffer circuit; Described CPU is electrically connected to respectively display, timing circuit and warning circuit; The output terminal of described warning circuit is also electrically connected with sample circuit; Described AD converter is also electrically connected with sample circuit; Described sample circuit is installed on testing resistance place.
Described transformer T adopts switch transformer, and it adopts the topological structure of positive activation type; Described buffer circuit (not shown) function photoelectric isolating circuit; Described display is three and half LCD digital watches; In described power circuit Ui, be provided with 220V floating charge power supply; Also be provided with 10 rechargeable Ni-H 2 batteries of 12V altogether; Described warning circuit is comprised of hummer and crystal oscillating circuit; Described timing circuit is comprised of crystal oscillator and electric capacity; Described AD converter is double integrator A/D convertor circuit; Described voltage amplifier circuit is push-pull amplifier circuit, and the output stage of push-pull amplifier circuit had both improved the load capacity of circuit, can improve switching speed again.
Embodiment recited above is described preferred implementation of the present utility model, not design of the present utility model and scope is limited.Do not departing under the prerequisite of the utility model design concept; various modification and improvement that this area ordinary person makes the technical solution of the utility model; all should drop into protection domain of the present utility model; the technology contents that the utility model is asked for protection, is all documented in claims.
Claims (8)
1. an adjustable high pressure numerical megger, is characterized in that: comprise transformer; Described transformer input end access power circuit; Its output terminal is serially connected with diode, inductance and electric capacity; Described electric capacity is also connected to voltage amplifier circuit; The output terminal of described voltage amplifier circuit is connected with electric bridge; The output terminal of described electric bridge is electrically connected with DC/DC converter; Described DC/DC converter is electrically connected to CPU by AD converter by buffer circuit; Described CPU is electrically connected to respectively display, timing circuit and warning circuit; The output terminal of described warning circuit is also electrically connected with sample circuit; Described AD converter is also electrically connected with sample circuit; Described sample circuit is installed on testing resistance place.
2. adjustable high pressure numerical megger according to claim 1, is characterized in that: described transformer adopting switch transformer, it adopts the topological structure of positive activation type.
3. adjustable high pressure numerical megger according to claim 1, is characterized in that: described buffer circuit function photoelectric isolating circuit.
4. adjustable high pressure numerical megger according to claim 1, is characterized in that: described display is three and half LCD digital watches.
5. adjustable high pressure numerical megger according to claim 1, is characterized in that: in described power circuit, be provided with 220V floating charge power supply; Also be provided with 10 rechargeable Ni-H 2 batteries of 12V altogether.
6. adjustable high pressure numerical megger according to claim 1, is characterized in that: described warning circuit is comprised of hummer and crystal oscillating circuit; Described timing circuit is comprised of crystal oscillator and electric capacity.
7. adjustable high pressure numerical megger according to claim 1, is characterized in that: described AD converter is double integrator A/D convertor circuit.
8. adjustable high pressure numerical megger according to claim 1, is characterized in that: described voltage amplifier circuit is push-pull amplifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420155860.8U CN203894331U (en) | 2014-04-01 | 2014-04-01 | Adjustable high-voltage digital megohm meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420155860.8U CN203894331U (en) | 2014-04-01 | 2014-04-01 | Adjustable high-voltage digital megohm meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203894331U true CN203894331U (en) | 2014-10-22 |
Family
ID=51720713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420155860.8U Expired - Fee Related CN203894331U (en) | 2014-04-01 | 2014-04-01 | Adjustable high-voltage digital megohm meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203894331U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459382A (en) * | 2014-11-24 | 2015-03-25 | 江西洪都航空工业集团有限责任公司 | Cable insulation detection device |
| CN106526326A (en) * | 2016-12-21 | 2017-03-22 | 广西水利电力职业技术学院 | Multifunctional hand-operated megohmmeter |
-
2014
- 2014-04-01 CN CN201420155860.8U patent/CN203894331U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459382A (en) * | 2014-11-24 | 2015-03-25 | 江西洪都航空工业集团有限责任公司 | Cable insulation detection device |
| CN106526326A (en) * | 2016-12-21 | 2017-03-22 | 广西水利电力职业技术学院 | Multifunctional hand-operated megohmmeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20141022 Termination date: 20150401 |
|
| EXPY | Termination of patent right or utility model |