CN201732123U - Constant-flow type earthing resistance tester - Google Patents
Constant-flow type earthing resistance tester Download PDFInfo
- Publication number
- CN201732123U CN201732123U CN2010202463537U CN201020246353U CN201732123U CN 201732123 U CN201732123 U CN 201732123U CN 2010202463537 U CN2010202463537 U CN 2010202463537U CN 201020246353 U CN201020246353 U CN 201020246353U CN 201732123 U CN201732123 U CN 201732123U
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- China
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- resistance tester
- power
- casing
- power supply
- earth resistance
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- Expired - Fee Related
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Abstract
The utility model relates to a constant-flow type earthing resistance tester which belongs to an electric performance tester and is characterized in that the shell of a hand-operated type earthing resistance tester is adopted as a shell; a storage battery, an inverter, a power transformer, a current transformer, a sliding resistance and a galvanometer are adopted as power supply parts; moreover, a button switch, a power indicator lamp and a charging socket are arranged. The power supply parts are arranged on the position of a hand generator in the original earthing resistance tester. The button switch and the power indicator lamp are arranged on the top surface of the original earthing resistance tester; the charging socket is arranged in the opening of the original rocker of the shell; and the storage battery is inverted into an alternating current of 100Hz and 100V by the inverter and then is connected with a subsequent current inside the original earthing resistance tester. The constant-flow type earthing resistance tester has the advantages of simple structure, convenient operation, strong anti-interruption capacity, small size and convenience; moreover, the test result is less influenced by anthropic factors.
Description
(1) technical field
The utility model relates to the proving installation of electrical property, and the test of Electrical Measuring Instrument or calibration particularly are a kind of constant current mode earth resistance testers.
(2) background technology
In electric system, be to guarantee the safety in the electric equipment operation, and the personal safety of electrical equipment when breaking down, must make the appropriate ground connection of uncharged metal shell.Because the earthing device major part is embedded in and is subjected to damage of external force in the soil easily, must measure stake resistance, and qualified back grounding apparatus just can put into operation for this reason.But the hand-rail type earth resistance tester of our existing use because " megger " is hand generator, does not have anti-interference, and therefore stability, precision, repeatability all can not be guaranteed, and cause the inaccurate of test data.Patent documentation is not found " constant current mode earth resistance tester " by retrieval.
(3) summary of the invention
The purpose of this utility model just is autonomous innovation, and development provides a kind of constant current mode earth resistance tester hand and that antijamming capability is strong that need not, and makes that the test job of stake resistance is convenient, accurate.
Above-mentioned purpose is realized by following technical proposals:
The constant current mode earth resistance tester comprises casing, power supply part, current transformer, slide wire resistance, galvanometer five parts.Power supply part, current transformer, slide wire resistance, galvanometer are contained in the casing.It is characterized in that casing adopts the casing of hand-rail type earth resistance tester, power supply part adopts accumulator, inverter circuit and power transformer to form.And on casing, be provided with pushbutton switch, power light and charging socket, power supply part is installed in the installation site of hand generator in the hand earth resistance tester, pushbutton switch, power light are installed in former earth resistance tester casing end face, the charging socket is installed in the former rocking arm tapping of casing, the input termination accumulator of inverter circuit, output terminal one tunnel is connected in the subsequent conditioning circuit of former earth resistance tester inside, and another road is inserted power transformer and working power is provided for the reference voltage comparator circuit.Pushbutton switch is serially connected in the accumulator back, and power light then is connected in parallel on the output terminal of inverter circuit, and the charging socket is attempted by the two ends of accumulator anode and cathode.Current transformer, slide wire resistance, galvanometer adopt not change of current transformer, slide wire resistance, its installation site of galvanometer and electrical connection in the hand-rail type earth resistance tester.
Power supply part in the above-mentioned constant current mode earth resistance tester adopts 6V, 5Ah accumulator, and inverter circuit is reverse into 100Hz, 100V alternating current with the 6V direct supply, reduces to the voltage of one road 20V simultaneously through power transformer.
This stake resistance resistance meter is owing to adopt casing, current transformer, slide wire resistance, the galvanometer of hand-rail type earth resistance tester, so it is simple in structure, practical, reduced manufacturing cost, its the most outstanding advantage is to have overcome the influence to test result in the highfield environment of human factor and test specimen, also become very simple of the operation of instrument simultaneously.
(4) description of drawings
Accompanying drawing 1 is circuit theory diagrams of the present utility model.
Accompanying drawing 2 is casing profile schematic top plan view of the present utility model.
(5) embodiment
Embodiment of accompanying drawings:
In the accompanying drawing 1, GB is an accumulator, and UI is an inverter circuit, and XD is a power light, and XS is the charging socket, and TA is a current transformer, and B is a power transformer, R
1Be that multiplying power is selected resistance, R
2Be slide wire resistance, mA is a galvanometer, C
2, P
2Be tested ground-electrode, P
1Be potential probes, C
1Be current probe, SB is a pushbutton switch.
1 is the external cabling terminal in the accompanying drawing 2, the 2nd, and slide wire resistance dial plate, the 3rd, power light, the 4th, pushbutton switch, the 5th, multiplying power adjusting knob, the 6th, slide wire resistance adjusting knob, the 7th, handle, the 8th, casing, the 9th, galvanometer pointer, the 10th, charging socket.
Shown in accompanying drawing, this tester comprises casing 8, power supply part, current transformer TA, slide wire resistance R
2Be contained in the casing 8 with galvanometer mA.It is characterized in that casing adopts the casing 8 of hand-rail type earth resistance tester, power supply part adopts accumulator GB, inverter circuit UI, and power transformer B, and be provided with pushbutton switch SB, power light XD and charging socket XS.Power supply part is installed in the installation site of hand earth resistance tester hand generator.Pushbutton switch SB and power light XD are installed in former earth resistance tester casing end face, and charging socket XS is installed in the place, former rocking arm hole of casing.By shown in Figure 1, accumulator inserts the input end of inverter circuit UI through pushbutton switch, power light XD is attempted by the output terminal of inverter circuit UI, and the output terminal one road of inverter circuit UI inserts current transformer TA, and another road is inserted power transformer B and working power is provided for the reference voltage comparator circuit.
Accumulator among Fig. 1 selects for use voltage to be not less than the accumulator of 5Ah for the 6V capacity, and the inverter circuit output voltage is 100V, and frequency is the alternating current of 100Hz, and the output terminal of power transformer is 20V, the alternating current of 100Hz.
Principle of work is: give tested earthing pole C
2, P
2With potential probes P
1And current probe C
1, each other at a distance of 20 meters, make potential probes P according to straight line
1Be in earthing pole and current probe C
1The centre position, on request probe is inserted the earth.With the terminal C of special wire with earth resistance tester
2, P
2, P
1, C
1Corresponding connection with the probe position presses the button SB then, and power light is bright, regulate slide wire resistance adjusting knob 6, make the galvanometer pointer be instructed in position of center line, at this moment, the scale reading that the slide wire resistance dial plate refers to multiply by multiplying power adjusting knob reading, is measured resistance value (Ω).
Claims (2)
1. constant current mode earth resistance tester, comprise casing, power supply part, current transformer, slide wire resistance and galvanometer five parts, power supply part, current transformer, slide wire resistance and galvanometer are contained in the casing, it is characterized in that casing adopts the casing (8) of hand-rail type earth resistance tester, power supply part adopts accumulator (GB), inverter circuit (UI), power transformer (B), and be provided with pushbutton switch (SB), power light (XD) and charging socket (XS), power supply part is installed in the installation site of hand generator in the hand earth resistance tester, pushbutton switch (SB), power light (XD) is installed in former earth resistance tester casing end face, charging socket (XS) is installed in the former rocking arm tapping of casing, the input termination accumulator (GB) of inverter circuit (UI), output terminal one tunnel is connected in the subsequent conditioning circuit of former earth resistance tester inside, and another road is inserted power transformer (B) and working power is provided for the reference voltage comparator circuit.
2. constant current mode earth resistance tester according to claim 1, it is characterized in that accumulator selects for use voltage to be not less than the accumulator of 5Ah for the 6V capacity, the inverter circuit output voltage is 100V, and frequency is the alternating current of 100Hz, the power transformer output terminal is 20V, the alternating current of 100Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202463537U CN201732123U (en) | 2010-06-22 | 2010-06-22 | Constant-flow type earthing resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202463537U CN201732123U (en) | 2010-06-22 | 2010-06-22 | Constant-flow type earthing resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201732123U true CN201732123U (en) | 2011-02-02 |
Family
ID=43523282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202463537U Expired - Fee Related CN201732123U (en) | 2010-06-22 | 2010-06-22 | Constant-flow type earthing resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201732123U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044467A (en) * | 2015-05-25 | 2015-11-11 | 苏州市华安普电力工程有限公司 | Multifunctional earth resistance tester |
| CN109116123A (en) * | 2018-07-26 | 2019-01-01 | 国网山东省电力公司莱芜供电公司 | A kind of transformer grounding resistance measuring system and method using photovoltaic DC-to-AC converter |
-
2010
- 2010-06-22 CN CN2010202463537U patent/CN201732123U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044467A (en) * | 2015-05-25 | 2015-11-11 | 苏州市华安普电力工程有限公司 | Multifunctional earth resistance tester |
| CN109116123A (en) * | 2018-07-26 | 2019-01-01 | 国网山东省电力公司莱芜供电公司 | A kind of transformer grounding resistance measuring system and method using photovoltaic DC-to-AC converter |
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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: 20110202 Termination date: 20110622 |