CN103245836A - Novel intelligent tramegger with self-discharge function - Google Patents
Novel intelligent tramegger with self-discharge function Download PDFInfo
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- CN103245836A CN103245836A CN2013101757118A CN201310175711A CN103245836A CN 103245836 A CN103245836 A CN 103245836A CN 2013101757118 A CN2013101757118 A CN 2013101757118A CN 201310175711 A CN201310175711 A CN 201310175711A CN 103245836 A CN103245836 A CN 103245836A
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Abstract
The invention relates to a novel intelligent tramegger with a self-discharge function. The novel intelligent tramegger is characterized by comprising a DC voltage output unit, a sampling unit, a CPU control unit, an A/D (Analog/Digital) conversion unit, a first D/A (Digital/Analog) conversion unit, a second D/A conversion unit, a delay relay and a discharge resistor, wherein the delay relay and the discharge resistor are connected in series between a circuit terminal L and a ground terminal E and form a discharge loop together with a article to be tested and the magnetotelluric impedance; the sampling unit is connected to two ends of the discharge resistor; the sampling result passes through the A/D conversion unit and then is sent to the CPU control unit; and the CPU control unit is connected with the DC high-voltage output unit and the control terminal of the delay relay. The novel intelligent tramegger makes the best use of the digital signal processing technology and the singlechip control technology, effectively overcomes the shortcomings that a traditional digital tramegger can not achieve self-discharge and is low in intelligent degree, promotes the measurement technical level of insulating resistance, and has the advantages of safety and reliability in detection, high testing accuracy, simplicity and convenience in operation, strong anti-interference ability and the like.
Description
Technical field
The invention belongs to the insulation measurement technical field, especially a kind of novel intelligent megohmmeter with automatic discharging function.
Background technology
The insulation measurement of electrical equipment is the important means that checks the insulation of electrical installation state and guarantee operating personnel's personal safety.Because the existence of insulating medium absorbing phenomenon, for big capacity test specimen, also require to measure absorptance and polarization index, and, in order to prevent that residual charge causes the insulation of electrical installation performance to reduce even damage in the test specimen, should fully discharge behind each insulation resistance test.
At present, digital megohmmeter is the portable apparatus of the most frequently used measurement insulation resistance, and this megohmmeter need manually discharge after off-test, therefore, exists discharge insufficient even do not carry out the risk hidden danger of discharge operation.In addition, conventional digital formula megohmmeter adopts the mode of set time output usually when test absorptance and polarization index, and its robotization and intelligent degree are low, greatly reduced work efficiency, for example, when insulation resistance surpassed 10G Ω, absorptance and polarization index can be only for referencial use; Under the situation that insulating resistance value does not change with pressing time, absorptance and polarization index also no longer change, thereby should not adopt the set time way of output.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of reasonable in design, novel intelligent megohmmeter with automatic discharging function that precision is high, safe and reliable and easy and simple to handle is provided.
The present invention solves its technical matters and takes following technical scheme to realize:
A kind of novel intelligent megohmmeter with automatic discharging function comprises DC voltage output unit, sampling unit, CPU control module, A/D converting unit, a D/A converting unit, the 2nd D/A converting unit, timing relay and discharge resistance; Timing relay and discharge resistance be series between line terminal L and the ground terminal E and and test specimen and the earth impedance between form discharge loop, described sampling unit is connected the discharge resistance two ends and is used for gathering the electric current of test specimen and the voltage of discharge loop discharge resistance, sampled result is fed to the CPU control module after the A/D converting unit, described CPU control module is connected by the control end of a D/A converting unit with high direct voltage output unit and timing relay, negative high-voltage end connection line terminal L and the sampling unit of this high direct voltage output unit, this CPU control module also is connected with output unit by the 2nd D/A converting unit.
And described CPU control module is single-chip microcomputer.
Advantage of the present invention and good effect are:
The present invention is by being series at line terminal L(negative high voltage output terminal with timing relay and discharge resistance) and ground terminal E between, and form discharge loop between test specimen and the earth impedance, and then realize automatic discharging function, Digital Signal Processing and CPU control module (single-chip microcomputer) control technology have been taken full advantage of, having overcome conventional digital formula megohmmeter effectively can't discharge and the low shortcoming of intelligent degree automatically, further promoted the measuring technique level of insulation resistance, have detect safe and reliable, the testing precision height, easy and simple to handle, advantages such as antijamming capability is strong.
Description of drawings
Fig. 1 is circuit block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
A kind of novel intelligent megohmmeter with automatic discharging function, as shown in Figure 1, formed by DC voltage output unit, sampling unit, CPU control module, A/D converting unit, a D/A converting unit, the 2nd D/A converting unit, timing relay and discharge resistance.Timing relay and discharge resistance are series between line terminal L and the ground terminal E, and form discharge loop between test specimen and the earth impedance, and then realize automatic discharging function, and described discharge resistance is used for the electric current of restriction discharge loop, plays the effect of protection.Described sampling unit is connected the discharge resistance two ends and is used for the voltage that acquisition test flows through discharge resistance in the electric current of test specimen and the discharge loop, the output terminal of this sampling unit is connected with the A/D converting unit, and the result of sampling is sent to the CPU control module through the A/D converting unit.Described CPU control module is connected by the control end of a D/A converting unit with high direct voltage output unit and timing relay, negative high-voltage end connection line terminal L and the sampling unit of this high direct voltage output unit, this high direct voltage output unit is used for the control signal of response CPU control module, output or cut-out high direct voltage, this timing relay is used for the control signal of response CPU control module, after high direct voltage output is cut off, the conducting discharge loop discharges automatically to test specimen, after the test specimen discharge finishes, disconnect discharge loop.Described CPU control module also is connected with output unit by the 2nd D/A converting unit, this CPU control module carries out the intelligence computation of insulation resistance, absorptance, polarization index according to the electric current that collects test specimen on the one hand and result of calculation is shown at output unit, and according to the disjunction of result of calculation control high direct voltage and the closure of timing relay, on the other hand according to collecting discharge resistance voltage, the disconnection of control timing relay.
This intelligent megohmmeter is on the basis of conventional digital formula megohmmeter, increased intelligence computation and the output function of automatic discharging function and insulation resistance, absorptance, polarization index, for example, when insulating resistance value is higher than the setting thresholding, directly withdraw from test, the output insulating resistance value; After the sampling of the continuous several times of insulating resistance value, numerical value change withdraws from test when setting thresholding, output absorptance or polarization index, etc.
It is emphasized that; embodiment of the present invention is illustrative; rather than it is determinate; therefore the present invention includes and be not limited to the embodiment described in the embodiment; every other embodiments that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope of protection of the invention equally.
Claims (2)
1. the novel intelligent megohmmeter with automatic discharging function is characterized in that: comprise DC voltage output unit, sampling unit, CPU control module, A/D converting unit, a D/A converting unit, the 2nd D/A converting unit, timing relay and discharge resistance; Timing relay and discharge resistance be series between line terminal L and the ground terminal E and and test specimen and the earth impedance between form discharge loop, described sampling unit is connected the discharge resistance two ends and is used for gathering the electric current of test specimen and the voltage of discharge loop discharge resistance, sampled result is fed to the CPU control module after the A/D converting unit, described CPU control module is connected by the control end of a D/A converting unit with high direct voltage output unit and timing relay, negative high-voltage end connection line terminal L and the sampling unit of this high direct voltage output unit, this CPU control module also is connected with output unit by the 2nd D/A converting unit.
2. the novel intelligent megohmmeter with automatic discharging function according to claim 1, it is characterized in that: described CPU control module is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310175711.8A CN103245836B (en) | 2013-05-14 | 2013-05-14 | There is the intelligent megohmmeter of automatic discharging function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310175711.8A CN103245836B (en) | 2013-05-14 | 2013-05-14 | There is the intelligent megohmmeter of automatic discharging function |
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| CN103245836A true CN103245836A (en) | 2013-08-14 |
| CN103245836B CN103245836B (en) | 2015-09-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526326A (en) * | 2016-12-21 | 2017-03-22 | 广西水利电力职业技术学院 | Multifunctional hand-operated megohmmeter |
| CN107181397A (en) * | 2017-04-24 | 2017-09-19 | 北京长城华冠汽车科技股份有限公司 | A kind of remaining capacity eliminates circuit, distribution box and electric automobile |
| CN109030977A (en) * | 2018-06-01 | 2018-12-18 | 北京新能源汽车股份有限公司 | High-voltage wire breaking box and control method and control device thereof |
Citations (5)
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|---|---|---|---|---|
| CN1099484A (en) * | 1993-08-23 | 1995-03-01 | 中国科学技术大学 | Intelligent high-voltage megohmmeter |
| CN2265543Y (en) * | 1995-08-08 | 1997-10-22 | 王会 | Anti-interference electronic megohm-meter with automatic discharging indicating |
| CN201156061Y (en) * | 2008-01-03 | 2008-11-26 | 江苏省电力公司南京供电公司 | Counter strike preventing mechanical megameter |
| CN201724965U (en) * | 2010-07-06 | 2011-01-26 | 苏燕民 | Detachable stabilization protector for manual megohmmeter |
| CN201909813U (en) * | 2010-11-19 | 2011-07-27 | 河南省电力公司漯河供电公司 | Intelligent multifunctional high-voltage megohmmeter |
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2013
- 2013-05-14 CN CN201310175711.8A patent/CN103245836B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099484A (en) * | 1993-08-23 | 1995-03-01 | 中国科学技术大学 | Intelligent high-voltage megohmmeter |
| CN2265543Y (en) * | 1995-08-08 | 1997-10-22 | 王会 | Anti-interference electronic megohm-meter with automatic discharging indicating |
| CN201156061Y (en) * | 2008-01-03 | 2008-11-26 | 江苏省电力公司南京供电公司 | Counter strike preventing mechanical megameter |
| CN201724965U (en) * | 2010-07-06 | 2011-01-26 | 苏燕民 | Detachable stabilization protector for manual megohmmeter |
| CN201909813U (en) * | 2010-11-19 | 2011-07-27 | 河南省电力公司漯河供电公司 | Intelligent multifunctional high-voltage megohmmeter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526326A (en) * | 2016-12-21 | 2017-03-22 | 广西水利电力职业技术学院 | Multifunctional hand-operated megohmmeter |
| CN107181397A (en) * | 2017-04-24 | 2017-09-19 | 北京长城华冠汽车科技股份有限公司 | A kind of remaining capacity eliminates circuit, distribution box and electric automobile |
| CN109030977A (en) * | 2018-06-01 | 2018-12-18 | 北京新能源汽车股份有限公司 | High-voltage wire breaking box and control method and control device thereof |
| CN109030977B (en) * | 2018-06-01 | 2021-01-26 | 北京新能源汽车股份有限公司 | High-voltage wire breaking box and control method and control device thereof |
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| Publication number | Publication date |
|---|---|
| CN103245836B (en) | 2015-09-02 |
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