CN202149919U - High precision Loop resistance tester - Google Patents
High precision Loop resistance tester Download PDFInfo
- Publication number
- CN202149919U CN202149919U CN201120278432U CN201120278432U CN202149919U CN 202149919 U CN202149919 U CN 202149919U CN 201120278432 U CN201120278432 U CN 201120278432U CN 201120278432 U CN201120278432 U CN 201120278432U CN 202149919 U CN202149919 U CN 202149919U
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- China
- Prior art keywords
- high precision
- power supply
- resistance tester
- mcu
- loop resistance
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a high precision loop resistance tester. The loop resistance tester includes an inner structure and external devices. The inner structure is composed of an MCU (1), a switch power supply (2), a sampler (3) and a current and voltage sampling part (4). The MCU (1) connects with the switch power supply (2) and one end of the sampler (3) separately. The switch power supply (2) and the other end of the sampler (3) connect with the current and voltage sampling part (4). The external devices connect with the MCU (1) respectively. The MCU is adopted to control the high precision loop resistance tester in the utility model and a rotary mouse is used for operating. Moreover, an LCD in a specification of 240 * 128 is also equipped. The operation of the high precision loop resistance tester is simple and convenient. And the testing record can be memorized in random and printed immediately.
Description
Technical field
A kind of high precision circuit resistance tester of the utility model.
Background technology
Generally adopt the direct current resistance of conventional QJ44 type both arms direct current bridge measuring transformer coil, the loop resistance of primary cut-out in the electric system; And the measuring current of this type electric bridge is merely the mA level, is difficult to find the long-pending defective that reduces of transformer coil galvanic circle cross-sectional area of conductor.When measuring the loop resistance of high-voltage switch gear galvanic circle, owing to receive the influence of oxide layer between oil film and sound contact, the resistance value of measurement several times bigger than normal have been covered real loop resistance value.Therefore; Electricity Department standard SD301-88 " exchanging handing-over of 500KV electrical equipment and preventive trial rules " and new edition " electrical equipment preventive test rules " are made the regulation that is not less than 100A to the measurement electric current of isolating switch, disconnector loop resistance, with the accuracy of guaranteeing to measure.
The utility model content
The purpose of the utility model provides a kind of high precision circuit resistance tester, according to the up-to-date electric power operative norm DL/T845.4-2004 of the People's Republic of China (PRC), adopts high frequency switch power technology and digital circuit technique designed in conjunction to form.It is applicable to the measurement of switching control device loop resistance.The optional 50A of its measuring current, 100A, 150A, the 200A fourth gear directly records loop resistance, and in liquid crystal display, shows.This apparatus measures is accurate, stable performance, meets the requirement of electric power, the on-the-spot high-voltage switch gear maintenance of power supply department and high voltage switch gear factory's loop resistance test.
The high precision circuit resistance tester that the utility model provides comprises inner structure and external device; Inner structure partly is made up of MCU, Switching Power Supply, sampling thief and current-voltage sampling; MCU is connected with sampling thief with Switching Power Supply respectively; The other end of Switching Power Supply and sampling thief is connected the current-voltage sampling part, and said external device is connected with MCU respectively.
Preferably, above-mentioned external device comprises display screen, input equipment and output device.
Preferably, above-mentioned Switching Power Supply is the Switching Power Supply of two 100A, and sampling thief is high precision 16 bit AD sample devices.
Preferably, above-mentioned display screen is a LCDs, and input equipment is the rotation mouse, and output device is a mini-printer.
The beneficial effect of the utility model is:
1, adopt constant current source output, big electric current is breakdown switch contact oxide film effectively, obtains measurement result more accurately.
2. multiple functional, can store at random measurement data, the instant printing is connected with PC and uploads stored record.
3. the examination precision is high, and ultimate resolution reaches 0.01u Ω.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Among the figure: 1-MCU; The 2-Switching Power Supply; The 3-sampling thief; 4-current-voltage sampling part; The 5-display screen; The 6-input equipment; The 7-output device.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 1, the high precision circuit resistance tester comprises inner structure and external device; Inner structure is made up of MCU1, Switching Power Supply 2, sampling thief 3 and current-voltage sampling part 4; MCU1 is connected with sampling thief 3 with Switching Power Supply 2 respectively, and the other end of Switching Power Supply 2 and sampling thief 3 is connected current-voltage sampling part 4, wherein; Switching Power Supply 2 is the Switching Power Supply of two 100A, and sampling thief is high precision 16 bit AD sample devices.External device is connected with MCU1 respectively, and wherein, external device comprises display screen 5, input equipment 6 and output device 7.In the present embodiment, display screen 5 is a LCDs, and input equipment 6 is the rotation mouse, and output device 7 is a mini-printer.
The Switching Power Supply of built-in two 100A of high precision circuit resistance tester that the utility model provides adopts digital circuit technique and switch power technology designed in conjunction to form.It is applicable to the contact resistance of switching control device, the measurement of loop resistance.Its measuring current adopts big electric current, and the resistance of primary cut-out galvanic circle depends primarily on the contact resistance between the dynamic and static contact of isolating switch.The existence of contact resistance has increased the loss of conductor when energising, and the temperature of contact position is raise, and the current capacity the when size of its value directly influences operate as normal influences the cut-out ability of short-circuit current to a certain extent.Therefore, the every phase of isolating switch galvanic circle resistance meter value is a significant data of isolating switch installation, maintenance, inspection of quality.
The high precision circuit resistance tester that the utility model provides has following characteristics:
Big electric current: adopt up-to-date power technology, can long-time continuous export big electric current, overcome the drawback of pulsed power supplies immediate current, effectively breakdown switch contact oxide film obtains good test result.
Antijamming capability is strong: under serious disturbed condition, last bit data of liquid crystal display can be stabilized in ± 1 word scope in, stable reading, good reproducibility.
Long service life: all adopt precision resister, effectively eliminate the influence of environment temperature to measurement result, the use of military products connector has simultaneously strengthened resistance to shock.
The embodiment of the above is the preferred embodiments of the utility model; It is not the practical implementation scope that limits the utility model with this; The scope of the utility model comprises and is not limited to this embodiment that all shapes according to the utility model, the equivalence that structure is done change all in the protection domain of the utility model.
Claims (4)
1. high precision circuit resistance tester; Comprise inner structure and external device; It is characterized in that: inner structure is made up of MCU (1), Switching Power Supply (2), sampling thief (3) and current-voltage sampling part (4); MCU (1) is connected with sampling thief (3) with Switching Power Supply (2) respectively, and the other end of Switching Power Supply (2) and sampling thief (3) is connected current-voltage sampling part (4), and said external device is connected with MCU (1) respectively.
2. high precision circuit resistance tester according to claim 1 is characterized in that, said external device comprises display screen (5), input equipment (6) and output device (7).
3. high precision circuit resistance tester according to claim 1 and 2 is characterized in that, said Switching Power Supply (2) is the Switching Power Supply of two 100A, and sampling thief is high precision 16 bit AD sample devices.
4. high precision circuit resistance tester according to claim 2 is characterized in that, said display screen (5) is a LCDs, and input equipment (6) is the rotation mouse, and output device (7) is a mini-printer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120278432U CN202149919U (en) | 2011-08-02 | 2011-08-02 | High precision Loop resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120278432U CN202149919U (en) | 2011-08-02 | 2011-08-02 | High precision Loop resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202149919U true CN202149919U (en) | 2012-02-22 |
Family
ID=45590973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120278432U Expired - Fee Related CN202149919U (en) | 2011-08-02 | 2011-08-02 | High precision Loop resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202149919U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614591A (en) * | 2015-03-04 | 2015-05-13 | 无锡韩光电器股份有限公司 | Loop resistance tester for automatic change-over switch |
| CN104880606A (en) * | 2015-05-19 | 2015-09-02 | 苏州市华安普电力工程有限公司 | Loop resistance tester |
| CN106771635A (en) * | 2017-02-15 | 2017-05-31 | 武汉市欧睿科技有限公司 | A kind of circuit resistance tester |
-
2011
- 2011-08-02 CN CN201120278432U patent/CN202149919U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614591A (en) * | 2015-03-04 | 2015-05-13 | 无锡韩光电器股份有限公司 | Loop resistance tester for automatic change-over switch |
| CN104880606A (en) * | 2015-05-19 | 2015-09-02 | 苏州市华安普电力工程有限公司 | Loop resistance tester |
| CN106771635A (en) * | 2017-02-15 | 2017-05-31 | 武汉市欧睿科技有限公司 | A kind of circuit resistance tester |
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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: 20120222 Termination date: 20150802 |
|
| EXPY | Termination of patent right or utility model |