CN202018479U - High-precision testing device for portable-type loop resistor - Google Patents
High-precision testing device for portable-type loop resistor Download PDFInfo
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- CN202018479U CN202018479U CN2011201120869U CN201120112086U CN202018479U CN 202018479 U CN202018479 U CN 202018479U CN 2011201120869 U CN2011201120869 U CN 2011201120869U CN 201120112086 U CN201120112086 U CN 201120112086U CN 202018479 U CN202018479 U CN 202018479U
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Abstract
The utility model discloses a high-precision testing device for a portable-type loop resistor, which mainly comprises a main circuit, a testing control circuit and an auxiliary circuit, wherein the main circuit comprises an energy-storing unit, a large-current constant-current control main device, an access port of a tested loop resistor Rx and a reference resistor R0, and the energy-storing unit, the large-current constant-current control main device, the access port of the tested loop resistor Rx and the reference resistor R0 are formed into a series circuit; the testing control circuit comprises a current-adjusting control unit M2, a signal-converting unit Z1, a processor U1 and a human-computer interface M1, the current-adjusting control unit M2 is respectively connected with the large-current constant-current control main device and the processor U1 through signals, and the signal converting unit Z1 is connected with the main circuit and the processor U1 through signals; and the auxiliary circuit mainly comprises a battery, a power-supply management circuit B1, a battery-charging interface B2 and an energy-storing unit-charging interface B3. The testing device for the portable-type loop resistor has light weight and high measuring accuracy.
Description
Technical field
The utility model relates to a kind of electronic metering equipment, relates to a kind of high precision measurement device of portable loop resistance in particular.
Background technology
In power industry, very strict to the contact contact resistance size control requirement of switches such as high-pressure vacuum breaker switch, disconnector, generally have only 100 micro-ohms, even tens micro-ohms; The balance of transformer line resistance, motor lines resistance, reactor is required also very high, but its resistance is often very little, is difficult for measuring, therefore to resistance so that the accurate measurement of little resistance is most important.Past, the direct current resistance of the QJ44 type double-walled direct current bridge measuring transformer circle of general color routine, the contact resistance of primary cut-out in the electric system, and the measuring current of this class electric bridge only is 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 high-voltage switch gear galvanic circle contact resistance, because the influence of oxide layer between being subjected to oil film and sound contacting, measured value several times bigger than normal have been covered real contact resistance value.Therefore, Electricity Department standard " exchanging handing-over of 500KV electrical equipment and preventive trial rules ", new edition " electrical equipment preventive test rules " and " DL T 845.4-2004 electric resistance measuring apparatus leads to technical conditions the 4th part circuit resistance tester " make the measurement electric current of isolating switch, disconnector contact resistance and are not less than direct current 100A, electric current is held time and should be not less than the regulation of 1min, to guarantee accuracy.At present the loop instrument often adopts friendship one to hand over inversion transformation technique always, adopts pulse duration modulation method, but regulates also manual adjustments and make it to reach constant current 100A of electric current automatically; The 100A of employing Switching Power Supply is also arranged, make it to reach constant current 100A loop-around test.Said method generally adopts the high power conversion device, the big heaviness of device body of realization, and power-efficient is low, and poor stability, precision are not high, more can't portable type measuring.
Summary of the invention
The utility model provides the high precision measurement device that a kind of volume is little, in light weight, high precision also can realize the portable loop resistance of portable type measuring at the measuring method of the little resistance of above tradition and the many disadvantages of device existence.Can be widely used in the accurate measurement of equipment direct current resistances such as the test of switch loop resistance, transformer, reactor, motor in the power equipment.
The technical scheme in the invention for solving the technical problem is:
The high precision measurement device of portable loop resistance, mainly comprise main circuit, telemetry circuit and auxiliary circuit thereof, main circuit comprises access port and the reference resistance R0 of energy-storage units, big electric current constant current control main device, tested loop resistance Rx, and access port and the reference resistance R0 of energy-storage units, big electric current constant current control main device, tested loop resistance Rx are series circuit; Telemetry circuit comprises electric current adjustment control module (M2), signal conversion unit Z1, processor U1 and man-machine interface M1, electric current is adjusted control module M2 and is connected with processor U1 signal with big electric current constant current control main device respectively, and signal conversion unit Z1 is connected with processor U1 signal with main circuit; Auxiliary circuit mainly comprises battery and electric power management circuit B1, battery charge interface B2 and energy-storage units charging inlet B3.Can establish the pre-control electric current and the duration in device loop by man-machine interface, making in advance by processor Control current adjustment control module, the super capacitor of sufficient electrical energy discharges and produces a constant big electric current, add on tested loop resistance and the reference resistance, the voltage that produces is amplified the conversion post-sampling by signal conversion unit respectively and handles calculating, temperature-compensation circuit is arranged in the circuit, the temperature effect of compensate for reference resistance obtains tested loop resistance resistance and actual measuring current and demonstration in the loop more accurately.Be provided with in the device super capacitor and battery charging control circuit, make it can realize charging in this locality.This device both can be realized portable loop resistance measurement, the online measurement in the time of also can realizing mains-supplied.
Preferred version of the present utility model: described telemetry circuit also comprises temperature-compensation circuit, and on the outside surface of temperature element T1 attached to reference resistance R0 of temperature-compensation circuit, temperature-compensation circuit is connected with processor U1 signal.Temperature-compensation circuit can detect the temperature variation of the reference resistance in the test process, and compensation is calculated the reference resistance resistance and is subjected to Temperature Influence, thereby reaches more high-precision loop resistance test.
Preferred version of the present utility model: described energy-storage units is a ultracapacitor, and super capacitor is the large capacity single body capacitance of high capacity, low internal resistance, big discharge current or is the capacitance group of the connection in series-parallel combination of a plurality of electric capacity.
Preferred version of the present utility model: the signal detecting mode of tested loop resistance Rx and reference resistance R0 is the four-wire system form, to reduce test loop lead-in wire or the wiring influence to the loop resistance test error; Reference resistance R0 is high stability, low-temperature coefficient, powerful constantan resistance or copper-manganese resistance or the higher resistance of other stabilities.
Preferred version of the present utility model: described electric current is adjusted control module M2 and mainly is made of current setting unit setting, current feedback amplifying unit and amplifying unit U3, amplifying unit U3 is an operational amplifier, in addition, electric current adjustment control module M2 also comprises current sampling resistor and electric current start stop switch.Processor is adjusted constant current value by current setting circuit, and after the electric current start stop switch starts, can be behind the feedback amplifying unit according to the signal of sample resistance, constant-current control circuit is adjusted main circuit current rapidly to setting value and the stable output of constant current, and its constant current value can surpass 100A; Current sampling resistor in the circuit can be same resistance with the reference resistance that is used for tested loop resistance, also another reference resistance that can be in series for main control loop and measured resistance, and the resistance requirement is identical.
Preferred version of the present utility model: described signal conversion unit Z1 mainly is made of analog switch K2, amplifying unit U4 and A/D converter U2, the two-way input of analog switch K2 links to each other with the access port of tested loop resistance Rx and the two ends of reference resistance R0 respectively, the output of analog switch K2 links to each other with amplifying unit U4, and the timesharing switching of analog switch K2 is controlled by processor U1.After voltage signal during test on measured resistance and the reference resistance is selected by the analog switch timesharing, through same group of amplifying unit and AD converter, for the processor sampling processing, but circuit does not limit to therewith, can compensate like this temperature that reduces amplifying unit, AD converter and peripheral circuit parameter thereof float, the time influence of factor such as float, measuring accuracy can be higher.
Preferred version of the present utility model: the battery among described battery and the electric power management circuit B1 is common batteries or rechargeable battery, and electric power management circuit is with the power source conversion of different requirements in the Charge Management of realizing rechargeable battery and the circuit.
Preferred version of the present utility model: described energy-storage units charging inlet B3 comprises the ultracapacitor charge management circuit, the ultracapacitor charge management circuit can be detected control to charging current, the voltage of ultracapacitor, make things convenient for the external charging interface to ultracapacitor reliably, safely the charging.Tested loop resistance and reference resistance are in series and the circuit structure of conversion of signals and the data processing algorithm of canceling compensation, according to the sampled value on reference resistance and the tested loop resistance, calculating has been offset when constant-current discharge electric current, amplifier gain, voltage-reference etc. are subjected to and labile factor such as has been floated, temperature is floated and influence, accurately the tested loop resistance of high precision computation.
Preferred version of the present utility model: constant current master control device is an IGBT insulated gate bipolar transistor device, it has driving power little and power controlling is big, pressure drop is low, through-current capability is strong, characteristics such as time response is fast, it is controlled to be contactless adjusting control to major loop, does not have mechanical switch block, does not produce spark and mechanical damage; But be not limited thereto, also can be high power devices such as controllable silicon, high-power FET, cooperate other devices to realize contactless constant-current circuit.
Compared with prior art, the utlity model has following advantage:
1. can realize on-the-spot portable loop resistance measurement;
2. measuring accuracy height, volume is little, in light weight, cost is low, and the life-span is long;
3. can satisfy the adjustment needs of different measuring currents, the electric current setting range is wide, and the constant-current control accuracy height, good stability;
4. but long-time continuous is exported big electric current, has overcome the drawback of pulsed power supplies immediate current, and effectively the oxide film of breakdown switch contact obtains good test effect;
5. can satisfy power industry standard to measuring current, the electric current standard-required of circuit resistance tester such as hold time;
6. the measuring current that can the real time monitoring tester and the change curve of loop resistance, significant to the dynamic perfromance of further analysis switch contact resistance;
7. operating voltage is low, and is safe and reliable, and the electric heating loss is little, and power utilization rate height belongs to energy-saving product
8. the present invention is equally applicable to other electric circuit inspection to the resistance high-acruracy survey.
Description of drawings
Fig. 1 realizes the principle of device synoptic diagram of portable high-accuracy loop resistance test for the present invention.
Embodiment
As shown in the figure, the high precision measurement device of portable loop resistance, mainly comprise main circuit, telemetry circuit and auxiliary circuit thereof, main circuit comprises access port and the reference resistance R0 of energy-storage units, big electric current constant current control main device, tested loop resistance Rx, and access port and the reference resistance R0 of energy-storage units, big electric current constant current control main device, tested loop resistance Rx are series circuit; Telemetry circuit comprises electric current adjustment control module M2, signal conversion unit Z1, processor U1 and man-machine interface M1, electric current is adjusted control module M2 and is connected with processor U1 signal with big electric current constant current control main device respectively, and signal conversion unit Z1 is connected with processor U1 signal with main circuit; Auxiliary circuit mainly comprises battery and electric power management circuit B1, battery charge interface B2 and energy-storage units charging inlet B3.
Described telemetry circuit also comprises temperature-compensation circuit, and on the outside surface of temperature element T1 attached to reference resistance R0 of temperature-compensation circuit, temperature-compensation circuit is connected with processor (U1) signal.
Described energy-storage units is a ultracapacitor, and super capacitor is the large capacity single body capacitance of high capacity, low internal resistance, big discharge current or is the capacitance group of the connection in series-parallel combination of a plurality of electric capacity.
The signal detecting mode of tested loop resistance Rx and reference resistance R0 is the four-wire system form, and reference resistance R0 is high stability, low-temperature coefficient, powerful constantan resistance or copper-manganese resistance or the higher resistance of other stabilities.
Described electric current is adjusted control module (M2) and mainly is made of current setting unit setting, current feedback amplifying unit and amplifying unit (U3), amplifying unit (U3) is an operational amplifier, in addition, electric current adjustment control module (M2) also comprises current sampling resistor and electric current start stop switch.
Described signal conversion unit Z1 mainly is made of analog switch K2, amplifying unit U4 and A/D converter U2, the two-way input of analog switch K2 links to each other with the access port of tested loop resistance Rx and the two ends of reference resistance R0 respectively, the output of analog switch K2 links to each other with amplifying unit U4, and the timesharing switching of analog switch K2 is controlled by processor U1.
Battery among described battery and the electric power management circuit B1 is common batteries or rechargeable battery, and electric power management circuit is with the power source conversion of different requirements in the Charge Management of realizing rechargeable battery and the circuit.
Described energy-storage units charging inlet B3 comprises the ultracapacitor charge management circuit, the ultracapacitor charge management circuit can be detected control to charging current, the voltage of ultracapacitor, make things convenient for the external charging interface to ultracapacitor reliably, safely the charging.
Constant current master control device is an IGBT insulated gate bipolar transistor device.
Claims (9)
1. the high precision measurement device of portable loop resistance, it is characterized in that: mainly comprise main circuit, telemetry circuit and auxiliary circuit thereof, main circuit comprises access port and the reference resistance R0 of energy-storage units, big electric current constant current control main device, tested loop resistance Rx, and access port and the reference resistance R0 of energy-storage units, big electric current constant current control main device, tested loop resistance Rx are series circuit; Telemetry circuit comprises electric current adjustment control module M2, signal conversion unit Z1, processor U1 and man-machine interface M1, electric current is adjusted control module M2 and is connected with processor U1 signal with big electric current constant current control main device respectively, and signal conversion unit Z1 is connected with processor U1 signal with main circuit; Auxiliary circuit mainly comprises battery and electric power management circuit B1, battery charge interface B2 and energy-storage units charging inlet B3.
2. the high precision measurement device of portable loop resistance according to claim 1, it is characterized in that: described telemetry circuit also comprises temperature-compensation circuit, on the outside surface of temperature element T1 attached to reference resistance R0 of temperature-compensation circuit, temperature-compensation circuit is connected with processor (U1) signal.
3. the high precision measurement device of portable loop resistance according to claim 1 and 2, it is characterized in that: described energy-storage units is a ultracapacitor, and super capacitor is the large capacity single body capacitance of high capacity, low internal resistance, big discharge current or is the capacitance group of the connection in series-parallel combination of a plurality of electric capacity.
4. the high precision measurement device of portable loop resistance according to claim 3, it is characterized in that: the signal detecting mode of tested loop resistance Rx and reference resistance R0 is the four-wire system form, and reference resistance R0 is high stability, low-temperature coefficient, powerful constantan resistance or copper-manganese resistance or the higher resistance of other stabilities.
5. the high precision measurement device of portable loop resistance according to claim 4, it is characterized in that: described electric current is adjusted control module (M2) and mainly is made of current setting unit setting, current feedback amplifying unit and amplifying unit (U3), amplifying unit (U3) is an operational amplifier, in addition, electric current adjustment control module (M2) also comprises current sampling resistor and electric current start stop switch.
6. the high precision measurement device of portable loop resistance according to claim 5, it is characterized in that: described signal conversion unit Z1 mainly is made of analog switch K2, amplifying unit U4 and A/D converter U2, the two-way input of analog switch K2 links to each other with the access port of tested loop resistance Rx and the two ends of reference resistance R0 respectively, the output of analog switch K2 links to each other with amplifying unit U4, and the timesharing switching of analog switch K2 is controlled by processor U1.
7. the high precision measurement device of portable loop resistance according to claim 6, it is characterized in that: the battery among described battery and the electric power management circuit B1 is common batteries or rechargeable battery, and electric power management circuit is with the power source conversion of different requirements in the Charge Management of realizing rechargeable battery and the circuit.
8. the high precision measurement device of portable loop resistance according to claim 7, it is characterized in that: described energy-storage units charging inlet B3 comprises the ultracapacitor charge management circuit, the ultracapacitor charge management circuit can be detected control to charging current, the voltage of ultracapacitor, make things convenient for the external charging interface to ultracapacitor reliably, safely the charging.
9. the high precision measurement device of portable loop resistance according to claim 8, it is characterized in that: constant current master control device is an IGBT insulated gate bipolar transistor device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201120869U CN202018479U (en) | 2011-04-17 | 2011-04-17 | High-precision testing device for portable-type loop resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201120869U CN202018479U (en) | 2011-04-17 | 2011-04-17 | High-precision testing device for portable-type loop resistor |
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| Publication Number | Publication Date |
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| CN202018479U true CN202018479U (en) | 2011-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201120869U Expired - Fee Related CN202018479U (en) | 2011-04-17 | 2011-04-17 | High-precision testing device for portable-type loop resistor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157485A (en) * | 2014-07-20 | 2014-11-19 | 国家电网公司 | Acousto-optic indicator for switching degree of outdoor alternate current high voltage separation switch |
| CN104849566A (en) * | 2015-06-15 | 2015-08-19 | 南京信息职业技术学院 | Portable microhm meter |
| CN108627701A (en) * | 2017-03-15 | 2018-10-09 | 上海骐宏电驱动科技有限公司 | Resistance measurement system and resistance measuring equipment |
| CN109765431A (en) * | 2019-01-08 | 2019-05-17 | 科华恒盛股份有限公司 | Resistance measuring circuit, temperature sensing circuit and charging gun |
| CN111880005A (en) * | 2020-07-23 | 2020-11-03 | 广东电网有限责任公司清远供电局 | Loop resistance tester and control method thereof |
| CN112782483A (en) * | 2021-01-05 | 2021-05-11 | 保定市力兴电子设备有限公司 | Full-automatic tester for loop resistance |
| CN113252988A (en) * | 2021-07-05 | 2021-08-13 | 湖南亿能电子科技有限公司 | Handheld parameter tester and parameter testing method |
-
2011
- 2011-04-17 CN CN2011201120869U patent/CN202018479U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157485A (en) * | 2014-07-20 | 2014-11-19 | 国家电网公司 | Acousto-optic indicator for switching degree of outdoor alternate current high voltage separation switch |
| CN104849566A (en) * | 2015-06-15 | 2015-08-19 | 南京信息职业技术学院 | Portable microhm meter |
| CN108627701A (en) * | 2017-03-15 | 2018-10-09 | 上海骐宏电驱动科技有限公司 | Resistance measurement system and resistance measuring equipment |
| CN109765431A (en) * | 2019-01-08 | 2019-05-17 | 科华恒盛股份有限公司 | Resistance measuring circuit, temperature sensing circuit and charging gun |
| CN111880005A (en) * | 2020-07-23 | 2020-11-03 | 广东电网有限责任公司清远供电局 | Loop resistance tester and control method thereof |
| CN111880005B (en) * | 2020-07-23 | 2022-07-08 | 广东电网有限责任公司清远供电局 | Loop resistance tester and control method thereof |
| CN112782483A (en) * | 2021-01-05 | 2021-05-11 | 保定市力兴电子设备有限公司 | Full-automatic tester for loop resistance |
| CN113252988A (en) * | 2021-07-05 | 2021-08-13 | 湖南亿能电子科技有限公司 | Handheld parameter tester and parameter testing method |
| CN113252988B (en) * | 2021-07-05 | 2021-10-26 | 湖南亿能电子科技有限公司 | Handheld parameter tester and parameter testing method |
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| 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: 20111026 Termination date: 20150417 |
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| EXPY | Termination of patent right or utility model |