Method for checking SF6 gas density relay

A technology of gas density and calibration method, which is applied in the field of calibration of SF6 gas density relay calibrator for calibrating SF6 gas density relay, which can solve the problems of inconvenience, poor accuracy, and inconsistency of actual application conditions.

Active Publication Date: 2008-06-25
SHANGHAI ROYE ELECTRICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly used in the field, but there are the following problems: (1) the temperature has a great influence, and it is difficult to ensure the accuracy; (2) the use of SF 6 The gauge (relative pressure gauge) reading on the gas cylinder has poor accuracy, and the accuracy cannot be guaranteed. In addition, the density relay (absolute pressure relay) that uses the method of measuring the absolute pressure value may directly Larger errors are produced; 3) SF 6 The density relay is actually used in the step-down process, but it is not consistent with the actual application, and it also affects the accuracy of the calibration.
When testing the density relay, which is actually carried out by measuring the absolute pressure value, if it is to be accurate, the test value must be manually corrected, which is very troublesome and inconvenient
[0012] To sum up, there is no calibrator and calibration method that can accurately test SF of various measurement principles on various occasions. 6 Gas density relay (ie absolute pressure relay and relative pressure relay)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] For the tested SF 6 Whether the density relay is an absolute pressure relay or a relative pressure relay, use man-machine communication, that is, use man-machine dialogue or manual selection (the form of man-machine dialogue or manual selection can be flexible and diverse, without restrictions, for example, an external selection button, keyboard or switch; you can also use the keyboard on the LCD, you can also use the question answering method, you can also use the touch screen on the LCD to operate, etc.), to confirm with the instrument.

[0045] The absolute pressure sensor is used to measure the absolute pressure relay to obtain the absolute pressure value, and then according to the temperature value (obtained by the temperature sensor) and SF during the test 6 The pressure-temperature characteristic relationship of the gas is automatically converted to the corresponding absolute pressure value at 20°C, and the SF 6 Performance verification of gas density relays.

...

Embodiment 2

[0051] Using sensors of two methods of measuring pressure values, that is, relative pressure sensor and absolute pressure sensor, apply the same pressure (relative pressure can be 0) for measurement, so as to obtain the local atmospheric pressure P 当地气压 =P 绝对传感器压力 -P 相对传感器压力 . and put the local atmospheric pressure P 当地气压 stored in the instrument.

[0052] For the tested SF 6 Whether the density relay is an absolute pressure relay or a relative pressure relay, use man-machine communication, that is, use man-machine dialogue or manual selection (the form of man-machine dialogue or manual selection can be flexible and diverse, without restrictions, for example, an external selection button, keyboard or switch; you can also use the keyboard on the LCD, you can also use the question answering method, you can also use the touch screen on the LCD to operate, etc.), to confirm with the instrument.

[0053] Both types of density relays were tested with sensors measuring absolute ...

Embodiment 3

[0060] Using sensors of two methods of measuring pressure values, that is, relative pressure sensor and absolute pressure sensor, apply the same pressure (relative pressure can be 0) for measurement, so as to obtain the local atmospheric pressure P 当地气压 =P 绝对传感器压力 -P 相对传感器压力 . and put the local atmospheric pressure P 当地气压 stored in the instrument.

[0061] For the tested SF 6 Whether the density relay is an absolute pressure relay or a relative pressure relay, use man-machine communication, that is, use man-machine dialogue or manual selection (the form of man-machine dialogue or manual selection can be flexible and diverse, without restrictions, for example, an external selection button, keyboard or switch; you can also use the keyboard on the LCD, you can also use the question answering method, you can also use the touch screen on the LCD to operate, etc.), to confirm with the instrument.

[0062] Both types of density relays were tested with sensors measuring relative ...

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PUM

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Abstract

The invention relates to a calibration method for SF6 gas density relay. An absolute pressure transducer and/or a relative pressure transducer can be adopted for measuring an absolute pressure relay and/or a relative pressure relay, and then a pressure value when the SF6gas density relay acts is obtained; according to the type of the relay to be tested, namely the absolute pressure relay or the relative pressure relay, the type of the transducer used for measurement, namely the absolute pressure transducer or the relative pressure transducer, the temperature value during measurement, and the pressure-temperature characteristic relation of the SF6 gas, a corresponding pressure value at 20 DEG C is obtained after data processing, and thus the accurate test on the performance of the SF6 gas density relay is completed. The calibration method for SF6 gas density relay provided by the invention can calibrate SF6 gas density relays of various measurement philosophies under various circumstances without being affected by located atmosphere pressure.

Description

technical field [0001] The present invention relates to a kind of SF 6 Calibration method of gas density relay calibration instrument, especially relates to a kind of SF 6 Gas density relay calibrator to calibrate SF 6 Calibration method of gas density relay. Background technique [0002] SF 6 Electrical products have been widely used in the power sector, industrial and mining enterprises, and promoted the rapid development of the power industry. How to guarantee SF 6 The reliable and safe operation of electrical products has become one of the important tasks of the power sector. SF 6 Gas density relay is SF 6 One of the key components of electrical switches, it is used to detect SF 6 SF in the electrical equipment body 6 The change of gas density, its performance directly affects the SF 6 Reliable and safe operation of electrical equipment. SF installed on site 6 Due to the infrequent action of the gas density relay, after a period of time, the phenomenon of inf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/00G01K11/00G01M19/00H01H35/18G01M99/00
Inventor 苏丽芳
Owner SHANGHAI ROYE ELECTRICAL CO LTD
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