CN201637807U - Power frequency leakage current tester - Google Patents
Power frequency leakage current tester Download PDFInfo
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- CN201637807U CN201637807U CN2010201824453U CN201020182445U CN201637807U CN 201637807 U CN201637807 U CN 201637807U CN 2010201824453 U CN2010201824453 U CN 2010201824453U CN 201020182445 U CN201020182445 U CN 201020182445U CN 201637807 U CN201637807 U CN 201637807U
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- leakage current
- phase
- frequency leakage
- unit
- power frequency
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Abstract
A power frequency leakage current tester is characterized in that the tester comprises a power supply input unit (10) and a voltage regulating circuit (20), a selecting unit (30) and an output unit (40) which are sequentially connected with the power supply unit (10). The utility model can provide the standard voltage, measures the milliampere current by adopting a high-precision digital display meter and has the overcurrent protection function. In addition, the tester has the advantages of simple structure, higher voltage regulating precision and simple and convenient testing.
Description
Technical field
The utility model relates to surveying instrument, particularly the testing apparatus of low-voltage electrical leakage current test.
Background technology
Low-voltage leakage current testing apparatus generally all is to adopt the integrated circuit of more complicated in the prior art, and not only cost is than higher for this equipment, and maintenance is also very inconvenient.
Summary of the invention
The utility model provides a kind of power frequency leakage current tester, and is simple and practical, solves complex structure in the prior art, technical matters (wishing to add the explanation of some prior aries (equipment) herein) that cost is high.
The utility model is for a kind of power frequency leakage current tester that provides is provided, and this tester comprises power input unit, the regulating circuit, selected cell and the output unit that are connected successively with this power supply unit.Described power input unit comprises the input end that connects external power supply and is arranged on pushbutton switch XT on the phase input end
1Described regulating circuit comprises pressure regulator T
1, single-phase isolating transformer T
2And single-phase many taps isolating transformer T
3, described power input unit meets pressure regulator T
1, pressure regulator T
1The isolated transformer T of output order
2Input, single-phase isolating transformer T
2Output connect output unit and selected cell respectively; Single-phase many taps isolating transformer T
2Input pressure regulator T in parallel
1Input, its output many taps connect selected cells.Described selected cell comprises many grades of selector button LW
1, multidigit selector button LW
1Each gear of one end connects single-phase many taps isolating transformer T by the different resistance R of resistance respectively
3Each tap of output connects output unit after each gear parallel connection of an other end.Described output unit comprises lead-out terminal, and the voltage table V in parallel with described lead-out terminal is connected on the reometer A on the phase output terminals.
This tester also comprises the overload protection unit that is arranged in power input unit and the output unit; Described overload protection unit comprises self-resetting switch BT1; pushbutton switch BT2; A.C. contactor KM1 and AC relay IM1; self-resetting switch BT1 wherein; the input end of pushbutton switch BT2 and A.C. contactor KM1 coil series connection back parallel connection power supply input block; the coil of described AC relay IM1 is connected on the phase output terminals; the control contact of described AC relay IM1 is connected between pushbutton switch BT2 and the A.C. contactor KM1 coil; A.C. contactor KM1; two control contacts of described A.C. contactor KM1 are connected on respectively on two lead-out terminals, and the 3rd control contact is in parallel with self-resetting switch BT1.
The power frequency leakage current tester of employing the utility model design proposal can provide the voltage of standard code, adopts high-precision digital display meter to measure a milliampere level electric current, and has overcurrent protection function, and this tester is simple in structure, and the pressure regulation precision is higher, tests easy.
Description of drawings
Fig. 1 is the circuit theory synoptic diagram of the utility model power frequency leakage current tester.
Embodiment
In conjunction with above-mentioned description of drawings specific embodiment of the utility model.
By among Fig. 1 as can be known, this power frequency leakage current tester comprises power input unit 10, the regulating circuit 20, selected cell 30 and the output unit 40 that are connected successively with this power supply unit 10; Output unit of the present utility model connects test products, by the digital displaying meter read test data that are provided with in the output unit.Described power input unit 10 comprises the input end that connects external power supply and is arranged on pushbutton switch XT on the phase input end
1Described regulating circuit 20 comprises pressure regulator T
1, single-phase isolating transformer T
2And single-phase many taps isolating transformer T
3, described power input unit 10 meets pressure regulator T
1, pressure regulator T
1The isolated transformer T of output order
2Input, single-phase isolating transformer T
2Output connect output unit 40 and selected cell 30 respectively; Single-phase many taps isolating transformer T
3Input pressure regulator T in parallel
1Input, many taps of its output connect selected cells 30; Described selected cell 30 comprises many grades of selector button LW
1, multidigit selector button LW
1Each gear of one end connects single-phase many taps isolating transformer T by the different resistance R of resistance respectively
3Each tap of output connects output unit 40 after each gear parallel connection of an other end.Described multidigit selector button LW
1Gear be fourth gear, the resistance of each gear resistance in series R is respectively: R
1=510 Ω, R
2=1000 Ω, R
3=1500 Ω and R
4=2000 Ω; Described output unit 40 comprises lead-out terminal 41, and the voltage table V in parallel with described lead-out terminal 41 is connected on the reometer A on the phase output terminals.
By among Fig. 1 as can be known; this tester also comprises the overload protection unit 50 that is arranged in power input unit 10 and the output unit 40; described overload protection unit 50 comprises self-resetting switch BT1; pushbutton switch BT2; A.C. contactor KM1 and AC relay IM1; wherein from the connection BT1 that resets out; the input end of pushbutton switch BT2 and A.C. contactor KM1 coil series connection back parallel connection power supply input block 10; the coil of described AC relay IM1 is connected on the phase output terminals; the control contact of described AC relay IM1 is connected between pushbutton switch BT2 and the A.C. contactor KM1 coil; A.C. contactor KM1; two control contacts of described A.C. contactor KM1 are connected on respectively on two lead-out terminals, and the 3rd control contact is in parallel with self-resetting switch BT1.The generalized case electric current can not surpass 5mA, and this equipment is provided with the 50mA protection, and when actual current surpassed this limit value, protection automatically after need powered-down and disconnect test product this moment, was measured again.Concrete parameter of the present utility model: input voltage: single-phase 220V～230V; Output voltage: 0～920V; Current measurement precision: 3 half; Short circuit fan-out capability:＞240mA.
(wishing to add the explanation of some this tester principle of work, combined circuit figure herein)
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. power frequency leakage current tester, it is characterized in that: this tester comprises power input unit (10), the regulating circuit (20), selected cell (30) and the output unit (40) that are connected successively with this power supply unit (10).
2. according to the described power frequency leakage current tester of claim 1, it is characterized in that: described power input unit (10) comprises the input end that connects external power supply and is arranged on pushbutton switch XT on the phase input end
1
3. according to the described power frequency leakage current tester of claim 2, it is characterized in that: described regulating circuit (20) comprises pressure regulator T
1, single-phase isolating transformer T
2And single-phase many taps isolating transformer T
3, described power input unit (10) meets pressure regulator T
1, pressure regulator T
1The isolated transformer T of output order
2Input, single-phase isolating transformer T
2Output connect output unit (40) and selected cell (30) respectively; Single-phase many taps isolating transformer T
3Input pressure regulator T in parallel
1Input, many taps of its output connect selected cells (30).
4. according to the described power frequency leakage current tester of claim 3, it is characterized in that: described selected cell (30) comprises that many grades are selected knob LW
1, multidigit selector button LW
1Each gear of one end connects single-phase many taps isolating transformer T by the different resistance R of resistance respectively
3Each tap of output connects output unit (40) after each gear parallel connection of an other end.
5. according to the described power frequency leakage current tester of claim 4, it is characterized in that: described multidigit selector button LW
1Gear be fourth gear, the resistance of each gear resistance in series R is respectively: R
1=510 Ω, R
2=1000 Ω, R
3=1500 Ω and R
4=2000 Ω.
6. according to the described power frequency leakage current tester of claim 4, it is characterized in that: described output unit (40) comprises lead-out terminal (41), and the voltage table V in parallel with described lead-out terminal (41) is connected on the reometer A on the phase output terminals.
7. according to each described power frequency leakage current tester in the claim 1 to 6, it is characterized in that: this tester also comprises the overload protection unit (50) that is arranged in power input unit (10) and the output unit (40).
8. according to the described power frequency leakage current tester of claim 7; it is characterized in that: described overload protection unit (50) comprises self-resetting switch BT1; pushbutton switch BT2; A.C. contactor KM1 and AC relay IM1; self-resetting switch BT1 wherein; the input end of pushbutton switch BT2 and A.C. contactor KM1 coil series connection back parallel connection power supply input block (10); the coil of described AC relay IM1 is connected on the phase output terminals; the control contact of described AC relay IM1 is connected between pushbutton switch BT2 and the A.C. contactor KM1 coil; A.C. contactor KM1; two control contacts of described A.C. contactor KM1 are connected on respectively on two lead-out terminals, and the 3rd control contact is in parallel with self-resetting switch BT1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201824453U CN201637807U (en) | 2010-04-20 | 2010-04-20 | Power frequency leakage current tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201824453U CN201637807U (en) | 2010-04-20 | 2010-04-20 | Power frequency leakage current tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201637807U true CN201637807U (en) | 2010-11-17 |
Family
ID=43082311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201824453U Expired - Fee Related CN201637807U (en) | 2010-04-20 | 2010-04-20 | Power frequency leakage current tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201637807U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499970A (en) * | 2013-10-18 | 2014-01-08 | 利欧集团股份有限公司 | Circuit board current detector |
| CN107942188A (en) * | 2017-11-23 | 2018-04-20 | 广东天圣高科股份有限公司 | A kind of leakage current tester detection device |
-
2010
- 2010-04-20 CN CN2010201824453U patent/CN201637807U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499970A (en) * | 2013-10-18 | 2014-01-08 | 利欧集团股份有限公司 | Circuit board current detector |
| CN107942188A (en) * | 2017-11-23 | 2018-04-20 | 广东天圣高科股份有限公司 | A kind of leakage current tester detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20110420 |