CN211718384U

CN211718384U - Loop resistance tester

Info

Publication number: CN211718384U
Application number: CN201922016396.XU
Authority: CN
Inventors: 周海滨
Original assignee: Maintenance and Test Center of Extra High Voltage Power Transmission Co
Current assignee: Maintenance and Test Center of Extra High Voltage Power Transmission Co
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-10-20
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses a loop resistance tester, include: the controller receives the voltage value measured by the voltage measuring interface, the current value measured by the current measuring interface and the temperature value measured by the thermometer, and converts the loop resistance value through the voltage value, the current value and the temperature value; and is electrically connected with the direct current output unit, the display, the USB interface and the alarm; the alarm is used for sending out an alarm signal when the test result in the controller exceeds the allowable value range; the voltage measuring interface, the current measuring interface, the display and the USB interface are all arranged on the same surface of the tester to form an operation panel. The utility model discloses a loop resistance tester can accurate measurement ambient temperature and carry out automatic conversion to test data, and test data around the conversion is automatic to be preserved and can conveniently derive, alleviates testing personnel work load, improves work efficiency.

Description

Loop resistance tester

Technical Field

The utility model relates to a resistance tester technical field especially relates to a loop resistance tester.

Background

The loop resistance test is an important test item of high-voltage electrical equipment. At present, a loop resistance tester is often used for measuring loop resistance of high-voltage electrical equipment such as a circuit breaker and an isolating switch, and the principle of the loop resistance tester is that a certain direct current is passed through tested equipment, direct current voltages at two ends of the tested equipment are measured, and the loop resistance of the tested equipment is obtained through calculation.

The loop resistance value of the high-voltage electrical equipment has close relation with the temperature during the test, and the test value is converted to a uniform temperature (such as 75 ℃) for comparison. At present, field operators generally carry portable hygrothermographs during a loop resistance test, read the temperature during the test, convert the loop resistance value according to the read temperature value, and compare the loop resistance value with a factory value or a previous value. The following problems exist in the field test of loop resistance:

1. during field test, the hygrothermographs carried by testers have uneven quality, and inaccurate display is easily caused after long-time use or on-site collision, so that the accuracy of the converted value of the loop resistance is influenced.

2. In field tests, the loop resistance values of a plurality of electrical devices are generally developed in sequence, and for accurately measuring the temperature, the temperature value needs to be read again in each test.

3. The loop resistance test of each electrical device needs to read the temperature through a portable hygrothermograph, manually convert the loop resistance value, and compare the loop resistance value with a factory value or a last value, so that the calculated amount is large. If the field working time is short, the calculation error of a tester can occur, if an overproof test value is calculated to be qualified, the operation of invoicing is required again after the error is found, the manpower and material resources are wasted, and the overhaul period is influenced.

SUMMERY OF THE UTILITY MODEL

To the problem, the utility model provides a loop resistance tester mainly solves present staff and uses the thermometer measured temperature to lead to that the data error is big and can not in time indicate the measured value to surpass the problem between safe value range interval.

The utility model provides a loop resistance tester, include:

the receiving port of the controller receives the voltage value measured by the voltage measuring interface, the current value measured by the current measuring interface and the temperature value measured by the thermometer; the output port of the controller outputs the converted voltage value, current value and temperature value; and is electrically connected with the direct current output unit, the display, the USB interface and the alarm;

the controller controls the direct current output unit to output stable direct current;

the display is used for displaying the voltage value, the current value and the temperature value received by the controller as well as the set voltage range value, the set current range value and the set temperature range value;

USB interface, which is used for the memory card to read the data of the controller;

the alarm is used for sending out an alarm signal when the test result in the controller exceeds the allowable value range;

the voltage measuring interface, the current measuring interface, the display and the USB interface are all arranged on the same surface of the tester to form an operation panel.

Furthermore, a temperature display is arranged on the operation panel and used for displaying the temperature value measured by the thermometer.

Further, the controller is a PLC or a single chip microcomputer.

Furthermore, the display is arranged at the center of the operation panel, and the number of the voltage measurement interfaces is three in a row and is vertically distributed on two sides of the display; the current measurement interface is one row three, sets up the both sides at voltage measurement interface.

Further, the controller is electrically connected with a printer, and a printing button is installed at the lower right corner of the operation panel and used for starting the printer to perform printing work.

The utility model has the advantages that:

1. the environment temperature can be accurately measured, the test data can be automatically converted, the test data before and after conversion can be automatically stored and conveniently exported, the workload of testers is reduced, and the working efficiency is improved;

2. the converted test data and the previous test data are automatically subjected to deviation calculation, so that the field calculation workload of testers is reduced;

3. when the deviation of the test result exceeds the specified value of the regulation, the instrument gives an alarm to remind the tester to recheck and process in time, so that the accuracy of the test result is improved, and extra work caused by data errors is avoided.

Drawings

Fig. 1 is a schematic connection diagram of a loop resistance tester module according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an operation panel of the loop resistance tester according to an embodiment of the present invention;

fig. 3 is a schematic view of a working state of the loop resistance tester according to an embodiment of the present invention;

wherein: 1. a loop resistance tester; 2. a controller; 3. a direct current output unit; 4. a voltage measurement interface; 5. a current measurement interface; 6. a thermometer; 7. an alarm; 8. a display; 9. a printer; 10. and a USB interface.

Detailed Description

In order to deepen the understanding of the present invention, the following embodiments will be combined to make the present invention do further details, and the present embodiment is only used for explaining the present invention, and does not constitute the limitation of the protection scope of the present invention.

As shown in fig. 1 to 3, the present embodiment provides a loop resistance tester, which can accurately measure an ambient temperature and automatically convert test data, wherein the conversion formula is to calculate according to a certain proportion, and convert the data to the same standard for comparison; the test data before and after the conversion is automatically stored and can be conveniently exported, the workload of testers is reduced, the working efficiency is improved, an instrument can give an alarm when the deviation of the test result exceeds the specified rule and the specified value, the testers are reminded to recheck and process in time, the accuracy of the test result is improved, and extra work caused by data errors is avoided.

The loop resistance tester 1 comprises a controller 2, the controller 2 is a PLC or a single chip microcomputer, a receiving port of the controller 2 receives a voltage value measured by a voltage measuring interface 4, a current value measured by a current measuring interface 5 and a temperature value measured by a thermometer 6, and an output port of the controller 2 outputs the voltage value, the current value and the temperature value after conversion; and is electrically connected with the direct current output unit 3, the display 8, the USB interface 10 and the alarm 7;

the controller 2 controls the direct current output unit 3 to output stable direct current, and the stable direct current is used for testing the current value and the voltage value of the tested object; the direct current output unit is a YC-107 type portable direct current standard source.

The display 8 is a dot matrix liquid crystal screen with the model number of CYW-B128 12864G and is used for displaying the voltage value, the current value, the temperature value received by the controller 2 and the set voltage range value, the current range value and the temperature range value;

a USB interface 10 for the memory card to read the data of the controller 2; make things convenient for the staff directly to read data from the tester, need not extra networking, be favorable to outdoor operations.

The alarm 7 is used for sending out an alarm signal when the test result in the controller 2 exceeds the allowable value range; when the deviation of the test result exceeds the specified value of the regulation, the instrument gives an alarm to remind the tester to recheck and process in time, so that the accuracy of the test result is improved, and extra work caused by data errors is avoided.

Wherein, voltage measurement interface 4, current measurement interface 5, display 8, USB interface 10 all install and form operating panel on the same face of tester. The above devices are all the prior arts available to those skilled in the art, and the detailed working principle and connection mode thereof will not be described herein.

Preferably, the operation panel is further provided with a temperature display for displaying the temperature value measured by the thermometer 6, and the temperature value measured on site can be visually and clearly obtained, so that the worker can judge whether the temperature value range is normal, and the temperature value is converted by the controller 2 and then the temperature value change condition of the machine to be measured is judged on the same standard.

Preferably, the display 8 is arranged at the center of the operation panel, and the number of the voltage measurement interfaces 4 is three in a row and is vertically distributed on two sides of the display 8; the current measuring interfaces 5 are arranged on two sides of the voltage measuring interface 4 in a row of three, and the distribution of the measuring interfaces is clear and sufficient for simultaneously spreading to measure different test points.

Preferably, the controller 2 is further electrically connected to the printer 9, a print button is installed at the lower right corner of the operation panel for starting the printer 9 to perform printing, the function of the printer is integrated in the tester, and the printer is convenient for on-site instant data printing and is adhered to the surface of the tested machine.

The voltage value in the conversion formula is converted into U_{Conversion calculation}＝K·U_Measuring、I_{Conversion calculation}＝K·I_Measuring、T_{Conversion calculation}＝K·T_Measuring(ii) a Wherein the value of K is a number in the range of 0.1 to 0.8.

The above-described embodiments are merely illustrative of the embodiments of the present invention, and do not limit the spirit and scope of the present invention. Under the prerequisite that does not deviate from the design concept of the utility model, the ordinary person in the art should fall into the protection scope of the utility model to the various changes and improvements that the technical scheme of the utility model made.

Claims

1. A loop resistance tester, comprising:

2. The loop resistance tester of claim 1, wherein a temperature display is further provided on the operating panel for displaying a temperature value measured by the thermometer.

3. The loop resistance tester of claim 1 wherein the controller is a PLC or a single chip.

4. The loop resistance tester of claim 1, wherein the display is disposed at a center position of the operation panel, and the number of the voltage measurement interfaces is three in a row and vertically distributed on two sides of the display; the current measurement interface is one row three, sets up the both sides at voltage measurement interface.

5. The loop resistance tester of claim 1, wherein the controller is further electrically connected to a printer, and a print button is installed at a lower right corner of the operation panel for starting the printer to perform a printing operation.