CN110954750A - Segmented intelligent loop resistance tester based on four-wire measurement method - Google Patents
Segmented intelligent loop resistance tester based on four-wire measurement method Download PDFInfo
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- CN110954750A CN110954750A CN201911369042.1A CN201911369042A CN110954750A CN 110954750 A CN110954750 A CN 110954750A CN 201911369042 A CN201911369042 A CN 201911369042A CN 110954750 A CN110954750 A CN 110954750A
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- 238000000691 measurement method Methods 0.000 title claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 230000011218 segmentation Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a segmented intelligent loop resistance tester based on a four-wire measurement method, belongs to instrument detection equipment, and particularly relates to a tester for performing segmented detection on resistance. The machine comprises an outer case and a clamping device connected with the outer case, wherein a constant current power supply is arranged in the outer case, the constant current power supply is connected with a standard resistor through a control circuit, and a detection end of the control circuit is connected with the clamping device; one end of the clamping device is provided with a plurality of clamps, the other end of the clamping device is provided with a corresponding plurality of bolts, and the clamps are connected with the bolts through lead cables. The invention aims to detect the resistors simultaneously in a segmented mode, reduce the work complexity of maintainers, improve the work efficiency and the like.
Description
Technical Field
The invention belongs to instrument detection equipment, and particularly relates to a segmented intelligent loop resistance tester based on a four-wire measurement method.
Background
When the contact resistance of the high-voltage switch conductive loop is measured, due to the influence of an oxidation layer between an oil film and a moving contact and a static contact, the problem is not easy to find by using an electric bridge for measurement, and the real contact resistance value is covered, so that according to the regulation of DL 596-1996' preventive test procedure for electrical equipment, a direct-current voltage drop method is adopted for measurement, and the test current is not less than 100A. If the resistance of the whole conductive loop of the isolating switch is large, the whole conductive loop is measured in a segmented mode as far as possible so as to effectively find the defect position. However, the single-section loop resistance tester provided by domestic manufacturers does not have the function of detecting the resistance in a segmented manner, the tested part needs to be replaced for many times in the measuring process, and various troubles such as complex work, low working efficiency, difficulty in sorting of test data and the like are caused to maintainers.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a segmented intelligent loop resistance tester based on a four-wire measurement method, which aims to simultaneously detect resistance in a segmented manner, reduce the complex work of maintainers, improve the work efficiency and the like.
The technical scheme is as follows:
the utility model provides a segmentation intelligence return circuit resistance tester based on four-wire measurement method, includes outer quick-witted case and the latch device who links to each other with it, its characterized in that: a constant current power supply is arranged in the outer case, the constant current power supply is connected with a standard resistor through a control circuit, and the detection end of the control circuit is connected with the clamping device; one end of the clamping device is provided with a plurality of clamps, the other end of the clamping device is provided with a corresponding plurality of bolts, and the clamps are connected with the bolts through lead cables.
The control circuit comprises a current signal test circuit and a voltage signal test circuit; in the current signal testing circuit, a current isolation sampling circuit and a current reference voltage circuit are connected with a current analog-to-digital conversion circuit, the current analog-to-digital conversion circuit is connected with a current crystal oscillator circuit, a current filter circuit and a current overvoltage protection circuit, two output ends of the current overvoltage protection circuit are respectively connected to two ends of a standard resistor, one end of the standard resistor is connected with a current anode of a constant current power supply, and the other end of the standard resistor is connected with a resistor to be tested; the current cathode of the constant current power supply is also connected to the resistor to be detected; in the voltage signal test circuit, a voltage isolation sampling circuit and a voltage reference voltage circuit are connected with a voltage analog-to-digital conversion circuit, the voltage analog-to-digital conversion circuit is connected with a voltage crystal oscillator circuit, a voltage filter circuit and a voltage overvoltage protection circuit, the voltage overvoltage protection circuit is connected with one end of a voltage division circuit, the other end of the voltage division circuit is connected with a plurality of relay switches respectively, and the other end of each relay switch is connected with a tested resistor.
The constant current power supply has the power of 2kW, the output current is more than or equal to 100A, and the power switch 8 is AC 220V.
The outer case is internally provided with a liquid crystal display, a printer, a cooling fan and an interface which can be connected with external equipment.
The advantages and effects are as follows: through the technical scheme of the invention, the segmented intelligent loop resistance tester based on the four-wire measurement method is researched, so that the working efficiency of maintainers can be improved, the defects of each part of the isolating switch can be effectively found, and the operation reliability of power grid equipment is greatly improved. In addition, the invention can not only detect the resistance of the high-voltage switch, but also be applied to the field of other electric equipment needing to measure the resistance value of the resistance.
Drawings
FIG. 1 is a schematic diagram of the main structure of the present invention;
FIG. 2 is a schematic diagram of a current signal testing circuit according to the present invention;
FIG. 3 is a schematic diagram of a voltage signal testing circuit according to the present invention;
FIG. 4 is a schematic view of a latch according to the present invention;
FIG. 5 is a schematic diagram of the test state of the present invention;
description of the attached labels:
1. a current anode, 2, a current cathode, 3, a first voltage test point, 4, a second voltage test point, 5, a third voltage test point, 6, a liquid crystal display, 7, a key, 8, a power switch, 9, a grounding column, 10, an RS-232 interface, 11, a USB interface, 12, a printer, 13, a cooling fan, 14, a constant current power supply, 15, a standard resistor, 16, an outer box, 17, a current isolation sampling circuit, 18, a current analog-to-digital conversion circuit, 19, a current crystal oscillator circuit, 20, a current overvoltage protection circuit, 21, a current reference voltage circuit, 22, a current filter circuit, 23, a voltage isolation sampling circuit, 24, a voltage analog-to-digital conversion circuit, 25, a voltage crystal oscillator circuit, 26, a voltage reference voltage circuit, 27, a voltage filter circuit, 28, a voltage overvoltage protection circuit, 29, a voltage division circuit, 30, a clamp, 31 and a lead cable, 32. and (4) a bolt.
Detailed Description
The invention provides a segmented intelligent loop resistance tester based on a four-wire measurement method, which is characterized in that the integral conductive loop resistance of the traditional isolating switch is large, no instrument and equipment capable of measuring the resistance in a segmented mode are provided, and a maintainer needs to replace a test part for multiple times, so that great trouble is caused to the maintenance work.
The main technical scheme of the invention is as follows: the device comprises an outer case 16 and a clamping device connected with the outer case 16, wherein a constant current power supply 14 is arranged in the outer case 16, the constant current power supply 14 is connected with a standard resistor 15 through a control circuit, and a detection end of the control circuit is connected with the clamping device; one end of the clamping device is provided with a plurality of clamps 30, the other end is provided with a plurality of corresponding bolts 32, and the clamps 30 and the bolts 32 are connected through a lead cable 31, as shown in fig. 1, 4 and 5. The plurality of clamps 30 are respectively clamped on a plurality of test points of the tested resistor, and the resistance value of the tested resistor is measured by the control circuit to be compared with the standard resistor, so that the conclusion that the tested resistor has defects at the section is obtained.
The control circuit comprises a current signal test circuit and a voltage signal test circuit; the current signal testing circuit is shown in fig. 2, a current isolation sampling circuit 17 and a current reference voltage circuit 21 are connected with a current analog-to-digital conversion circuit 18, the current analog-to-digital conversion circuit 18 is connected with a current crystal oscillator circuit 19, a current filter circuit 22 and a current overvoltage protection circuit 20, two output ends of the current overvoltage protection circuit 20 are respectively connected with two ends of a standard resistor, one end of the standard resistor 15 is connected with a current anode 1 of a constant current power supply, and the other end of the standard resistor is connected with a resistor to be tested; the negative current pole 2 of the constant current power supply is also connected to the resistor to be measured. Through the current circuit design, the circuit obtains accurate current value when passing through the tested equipment.
In the voltage signal testing circuit, as shown in fig. 3, a voltage isolation sampling circuit 23 and a voltage reference voltage circuit 26 are connected to a voltage analog-to-digital conversion circuit 24, the voltage analog-to-digital conversion circuit 24 is connected to a voltage crystal oscillator circuit 25, a voltage filter circuit 27 and a voltage overvoltage protection circuit 28, the voltage overvoltage protection circuit 28 is connected to one end of a voltage dividing circuit 29, the other end of the voltage dividing circuit 29 is connected to a plurality of relay switches, and the other end of each relay switch is connected to a tested resistor. Through the design of the voltage circuit, the circuit can obtain an accurate voltage value when passing through the tested equipment.
The instrument is internally provided with a 2kW constant current power supply 14 for outputting, and the output current of the constant current power supply 14 is more than or equal to 100A; the current output ports 1 are a group of current positive electrodes 1 and current negative electrodes 2 in the figure 1; in the present embodiment, 3 groups of voltage measurement ports can be accessed, which are a first voltage test point 3, a second voltage test point 4, and a third voltage test point 5, so that the resistance values of 3 sections of circuits can be measured at the same time by one-time wiring, as shown in fig. 5.
The power switch 8 is AC220V, the machine can be connected with the printer 12, the RS-232 interface 10 and the USB interface 11 through the liquid crystal display 6, the test point position is selected through the key 7, the grounding column 9 is grounded, and the machine is internally provided with the cooling fan 13 for cooling the equipment.
The measurement result can be stored and managed by the computer or the USB flash disk, and can be printed and output by a micro printer; different gears can be set for testing current and testing time, so that the field operation requirement is met; the circuit has perfect software and hardware protection circuits, has strong reliability and is suitable for different working environments.
The implementation steps of the invention are as follows: the method comprises the steps of starting operation, selecting a proper gear (200A/100A) for current, sending a starting signal, outputting a constant current (200A/100A) from I +, passing through a standard resistor 14, passing through an instrument panel wiring terminal I +, outputting the constant current to high-voltage tested switch equipment, passing through 3 sections of resistors, flowing into an instrument I-wiring terminal and flowing into a constant current power supply I-.
Voltage signals at two ends of the standard resistor 14 are respectively connected into the Ic + and Ic-current sampling circuits for sampling calculation, and the current value of the measurement loop can be obtained by sampling the obtained voltage value/standard resistance value.
The method comprises the steps of respectively introducing tested 3-section switch resistance signals into instrument panel wiring terminals V1+ and V1-, V2+ and V2-, V3+ and V3-, sequentially controlling the switches K1, K2 and K3 to act, connecting obtained Vc + and Vc-to a resistance sampling circuit for sampling calculation, and obtaining < voltage value >/< current value > of a measurement loop through sampling, so that 3-section switch resistance values R1, R2 and R3 can be obtained respectively.
In fig. 2 and 3, the chips U2 and U4 are of type ADuM 1401; the chip U5, U9 model ADR 4525; the chips U8 and U10 are AD 7705.
Through calculation, the pre-test cost for the work area is saved by about 5 ten thousand yuan each year, the power failure loss is reduced by about 100 ten thousand yuan, and the inspection cost for the work area is saved by about 15 ten thousand yuan each year. Accurate state evaluation, increased service life of equipment and saved equipment purchase cost by about 50 ten thousand yuan per year.
Claims (4)
1. The utility model provides a segmentation intelligence return circuit resistance tester based on four-wire measurement method, includes outer quick-witted case (16) and the latch device who links to each other with it, its characterized in that: a constant current power supply (14) is arranged in the outer case (16), the constant current power supply (14) is connected with a standard resistor (15) through a control circuit, and the detection end of the control circuit is connected with the clamping device; one end of the clamping device is provided with a plurality of clamps (30), the other end of the clamping device is provided with a plurality of corresponding bolts (32), and the clamps (30) are connected with the bolts (32) through lead cables (31).
2. The four-wire measurement based segmented intelligent loop resistance tester as claimed in claim 1, wherein: the control circuit comprises a current signal test circuit and a voltage signal test circuit; in the current signal testing circuit, a current isolation sampling circuit (17) and a current reference voltage circuit (21) are connected with a current analog-to-digital conversion circuit (18), the current analog-to-digital conversion circuit (18) is connected with a current crystal oscillator circuit (19), a current filter circuit (22) and a current overvoltage protection circuit (20), two output ends of the current overvoltage protection circuit (20) are respectively connected with two ends of a standard resistor, one end of the standard resistor is connected with a current anode (1) of a constant current power supply, and the other end of the standard resistor is connected with a tested resistor; the current cathode (2) of the constant current power supply is also connected to the resistor to be detected; in the voltage signal test circuit, a voltage isolation sampling circuit (23) and a voltage reference voltage circuit (26) are connected with a voltage analog-to-digital conversion circuit (24), the voltage analog-to-digital conversion circuit (24) is connected with a voltage crystal oscillator circuit (25), a voltage filter circuit (27) and a voltage overvoltage protection circuit (28), the voltage overvoltage protection circuit (28) is connected with one end of a voltage division circuit (29), the other end of the voltage division circuit (29) is respectively connected with a plurality of relay switches, and the other end of each relay switch is connected with a tested resistor.
3. The four-wire measurement based segmented intelligent loop resistance tester as claimed in claim 1, wherein: the constant current power supply (14) has the power of 2kW, the output current is more than or equal to 100A, and the power switch (8) is AC 220V.
4. The four-wire measurement based segmented intelligent loop resistance tester as claimed in claim 1, wherein: the outer case (16) is internally provided with a liquid crystal display (6), a printer (12), a cooling fan (13) and an interface which can be connected with external equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911369042.1A CN110954750A (en) | 2019-12-26 | 2019-12-26 | Segmented intelligent loop resistance tester based on four-wire measurement method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911369042.1A CN110954750A (en) | 2019-12-26 | 2019-12-26 | Segmented intelligent loop resistance tester based on four-wire measurement method |
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| CN110954750A true CN110954750A (en) | 2020-04-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327057A (en) * | 2020-12-03 | 2021-02-05 | 常州同惠电子股份有限公司 | On-resistance testing method for wire tester |
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- 2019-12-26 CN CN201911369042.1A patent/CN110954750A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327057A (en) * | 2020-12-03 | 2021-02-05 | 常州同惠电子股份有限公司 | On-resistance testing method for wire tester |
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