CN203069672U - Loop resistance testing system - Google Patents
Loop resistance testing system Download PDFInfo
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- CN203069672U CN203069672U CN 201320048565 CN201320048565U CN203069672U CN 203069672 U CN203069672 U CN 203069672U CN 201320048565 CN201320048565 CN 201320048565 CN 201320048565 U CN201320048565 U CN 201320048565U CN 203069672 U CN203069672 U CN 203069672U
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- loop resistance
- loop
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- resistance
- display screen
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Abstract
The utility model relates to a loop resistance tester. A loop resistance testing system provided by the utility model comprises a plurality of loop resistors, a sampling circuit, a signal amplification circuit, an AD converter, a PLC controller, a display screen and a power supply module, wherein the loop resistors, the sampling circuit, the signal amplification circuit, the AD converter, the PLC controller and the display screen are successively in electric connection, and the power supply module supplies power to the system. The loop resistance testing system in the utility model is applied to improvement of conventional loop resistance testing systems and is capable of simultaneously testing a plurality of loop resistors.
Description
Technical field
The utility model relates to circuit resistance tester, is specifically related to test the loop resistance test macro of dc resistance of main contact contact resistance value, the high-low pressure cable line of high and low voltage switch, and this loop resistance test macro can be tested a plurality of loop resistances simultaneously.
Background technology
In high and low voltage switch equipment, high-low pressure cable line, general some electrical contacts connect and form the galvanic circle, produce contact resistance in succession, and whole loop just constitutes loop resistance.And the loop resistance of high and low voltage switch equipment, high-low pressure cable line, the contact situation that has directly reflected switch contact, if the loop resistance resistance of high and low voltage switch equipment or high-low pressure cable line is too high, cause energy consumption increase and galvanic circle temperature rise too high, cause that easily equipment or circuit damage, and then cause large area blackout to take place, therefore, in the production of switch, check, installation, maintenance, maintenance process, need test its loop resistance, generally the equipment to loop-around test is circuit resistance tester.
Circuit resistance tester claims RX transformer circuit resistance meter again, English name: Loop Resistance Tester.Circuit resistance tester is applicable to the main contact contact resistance value of test high and low voltage switch, the dc resistance of high-low pressure cable line etc.When circuit resistance tester was used for the contact resistance of equipment such as measuring switch, isolating switch and transformer, general contact resistance value was smaller, and measuring current is greater than 100A.Generally with 4 lines mensuration processed.Electric current is measured voltage by the contact point of equipment under test from contact point, R=U/I.Circuit resistance tester of the prior art only can be to loop resistance measuring one by one, and can not measure simultaneously, makes troubles to the user.
The utility model content
Technical problem to be solved in the utility model is, a kind of loop resistance test macro is provided, and can select also can survey heterogeneous loop resistance simultaneously, and then solve the deficiency of prior art loop resistance one testing of a phase mutually.
In order to solve the problems of the technologies described above, a kind of loop resistance test macro of the present utility model, comprise several loop resistances, a sample circuit, a signal amplification circuit, an AD converter, a PLC controller, a display screen and power module, described loop resistance, sample circuit, signal amplification circuit, AD converter, PLC controller and display screen are electrically connected in turn, and described power module is system's power supply.
Described power module adopts the pulse-width modulation type high frequency switch power that measuring current (for example greater than 100A measuring current) is provided, when pressing the surveying work on ﹠ off switch, high frequency switch power output is greater than the measuring current more than the 100A, sample circuit begins sampling simultaneously, the electric current of acquisition circuit resistance and magnitude of voltage, after the process signal amplification circuit amplifies the signal of obtaining, after by AD converter analog signal conversion being become digital signal, through the PLC controller data are carried out filtering, computing, handle, send display screen to demonstrate the electric current of this time measuring at last, voltage and resistance value.Wherein, described display screen is preferably selected touch display screen for use.
Further, described sample circuit comprises Voltage detector and current detecting instrument.
Further, after being connected in series, described several loop resistances are connected with current detecting instrument, to detect the electric current in whole loop; Each loop resistance all is connected in parallel with Voltage detector, to detect the voltage of each loop resistance, calculates each loop resistance by detected voltage and current, thus test when realizing a plurality of loop resistance.
Further, the two ends of each loop resistance be connected in parallel respectively current detecting instrument and Voltage detector are with electric current and the voltage that detects each loop resistance; Like this, can realize independent test to certain loop resistance.
Further, this system also comprises printing device, and this printing device is electrically connected on the PLC controller, and the data that the computing of PLC controller can be obtained print.
The utility model passes through said structure, compared with prior art, both can be connected with current detecting instrument by several loop resistances back that be connected in series, the two ends of each loop resistance Voltage detector that also all is connected in parallel is tested when realizing a plurality of loop resistance; Also can be by each loop resistance be connected in parallel respectively current detecting instrument and Voltage detector, that loop resistance that perhaps will need to test inserts in the loop, can realize loop resistance one test of a phase is mutually perhaps selected certain loop resistance is tested separately.
Description of drawings
Fig. 1 is system principle diagram of the present utility model.
Fig. 2 is the synoptic diagram of a plurality of loop resistances of test of the present utility model.
Fig. 3 is the synoptic diagram of a loop resistance of test of the present utility model.
Embodiment
Now with embodiment the utility model is further specified by reference to the accompanying drawings.
As shown in Figure 1, a kind of loop resistance test macro of the present utility model, comprise several loop resistances, a sample circuit, a signal amplification circuit, an AD converter, a PLC controller, a display screen and power module, described loop resistance, sample circuit, signal amplification circuit, AD converter, PLC controller and display screen are electrically connected in turn, and described power module is system's power supply.
Described power module employing pulse-width modulation type high frequency switch power provides the measuring current greater than 100A, when pressing the surveying work on ﹠ off switch, high frequency switch power output is greater than the measuring current more than the 100A, sample circuit begins sampling simultaneously, the electric current of acquisition circuit resistance and magnitude of voltage, after the process signal amplification circuit amplifies the signal of obtaining, after by AD converter analog signal conversion being become digital signal, through the PLC controller data are carried out filtering, computing, processing, send display screen to demonstrate electric current, voltage and the resistance value of this time measuring at last.
Wherein, loop resistance generally is the main contact contact resistance of high and low voltage switch, sample circuit comprises Voltage detector and current detecting instrument, voltage and current situation to loop resistance is gathered, generally can select relevant voltage/current instrument of selling in the market for use, cooperate existing circuit resistance tester to realize simultaneously.Signal amplification circuit is generally realized by amplifier.The present technology of AD converter is very ripe, generally adopts the AD modular converter to realize.Described PLC controller can be selected the FX3U of Mitsubishi series high-performance PLC controller for use.Described display screen is preferably selected touch display screen for use, for example 7 of Taiwan WEINVIEW cun touch-screens.
Loop resistance test macro of the present utility model can directly be tested single-phase loop resistance, also can directly test ground three-phase electricity resistance fast.Also can be by data and the production line administrative system exchange of network with the output of PLC controller.This system can arrange printing device according to user's request, and this printing device is electrically connected on the PLC controller, and the data that the computing of PLC controller can be obtained print.In addition, can also increase data copy function (by USB flash disk with data backup) according to user's request.
As shown in Figure 2, when realizing that if desired 3 loop resistances are tested simultaneously, after being connected in series, these 3 loop resistances are connected with current detecting instrument, to detect the electric current in whole loop; Each loop resistance all is connected in parallel with Voltage detector, to detect the voltage of each loop resistance, calculates each loop resistance by detected voltage and current, thus test when realizing a plurality of loop resistance.
In addition, also can realize the independent test to certain loop resistance, as shown in Figure 3, with the loop resistance of needs tests be connected in parallel current detecting instrument and Voltage detector, with electric current and the voltage that detects these loop resistance two ends, can draw loop resistance by the voltage that detects divided by electric current.Like this, can realize independent test to certain loop resistance.
By the utility model, the user can select also can survey heterogeneous loop resistance simultaneously, and then solve the deficiency of prior art loop resistance one testing of a phase mutually.Simultaneously, loop resistance test macro of the present utility model adopts the direct current pressure decline method to measure contact resistance and the loop resistance of high-voltage switch gear, and its high-quality DC characteristic has guaranteed accuracy and the stability measured.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in not breaking away from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection domain of the present utility model.
Claims (7)
1. loop resistance test macro, it is characterized in that: comprise several loop resistances, a sample circuit, a signal amplification circuit, an AD converter, a PLC controller, a display screen and a power module, described loop resistance, sample circuit, signal amplification circuit, AD converter, PLC controller and display screen are electrically connected in turn, and described power module is system's power supply.
2. a kind of loop resistance test macro according to claim 1, it is characterized in that: described sample circuit comprises Voltage detector and current detecting instrument.
3. a kind of loop resistance test macro according to claim 2 is characterized in that: described several loop resistances back that is connected in series is connected with current detecting instrument, and each loop resistance all is connected in parallel with Voltage detector.
4. a kind of loop resistance test macro according to claim 2 is characterized in that: each loop resistance be connected in parallel respectively current detecting instrument and Voltage detector.
5. a kind of loop resistance test macro according to claim 1 is characterized in that: described power module employing pulse-width modulation type high frequency switch power.
6. a kind of loop resistance test macro according to claim 1, it is characterized in that: system also comprises printing device, this printing device is electrically connected on the PLC controller.
7. a kind of loop resistance test macro according to claim 1, it is characterized in that: described display screen is touch display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320048565 CN203069672U (en) | 2013-01-29 | 2013-01-29 | Loop resistance testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320048565 CN203069672U (en) | 2013-01-29 | 2013-01-29 | Loop resistance testing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203069672U true CN203069672U (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320048565 Expired - Lifetime CN203069672U (en) | 2013-01-29 | 2013-01-29 | Loop resistance testing system |
Country Status (1)
| Country | Link |
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| CN (1) | CN203069672U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569595A (en) * | 2013-10-25 | 2015-04-29 | 珠海格力电器股份有限公司 | Resistance value detection device and method |
| CN104764935A (en) * | 2015-04-15 | 2015-07-08 | 国网浙江省电力公司金华供电公司 | Resistance test equipment |
| CN104849563A (en) * | 2015-05-05 | 2015-08-19 | 国家电网公司 | Remote intelligent test device for loop resistance |
| CN104849656A (en) * | 2015-05-05 | 2015-08-19 | 国家电网公司 | Remote intelligent test device for overall characteristics of switching equipment |
| CN104931872A (en) * | 2015-05-05 | 2015-09-23 | 国家电网公司 | Switchgear remote intelligent test method |
| CN105467218A (en) * | 2015-11-05 | 2016-04-06 | 温州大学 | Contact resistance testing method of circuit breaker used for short-circuit protection |
| CN116256565A (en) * | 2023-02-27 | 2023-06-13 | 华能苏州热电有限责任公司 | Portable loop resistance tester |
-
2013
- 2013-01-29 CN CN 201320048565 patent/CN203069672U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569595A (en) * | 2013-10-25 | 2015-04-29 | 珠海格力电器股份有限公司 | Resistance value detection device and method |
| CN104764935A (en) * | 2015-04-15 | 2015-07-08 | 国网浙江省电力公司金华供电公司 | Resistance test equipment |
| CN104849563A (en) * | 2015-05-05 | 2015-08-19 | 国家电网公司 | Remote intelligent test device for loop resistance |
| CN104849656A (en) * | 2015-05-05 | 2015-08-19 | 国家电网公司 | Remote intelligent test device for overall characteristics of switching equipment |
| CN104931872A (en) * | 2015-05-05 | 2015-09-23 | 国家电网公司 | Switchgear remote intelligent test method |
| CN105467218A (en) * | 2015-11-05 | 2016-04-06 | 温州大学 | Contact resistance testing method of circuit breaker used for short-circuit protection |
| CN116256565A (en) * | 2023-02-27 | 2023-06-13 | 华能苏州热电有限责任公司 | Portable loop resistance tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130717 |
|
| CX01 | Expiry of patent term |