DL/T 259-2023 in English
VALIDCalibration code for SF6 gas density relay
- Issued on:2023-05-26
- Implemented on:2023-11-26
- File Format:PDF
- Delivery:Via email within 5 business days
$291.00
Introduction
Background of Standard Revision and Technological Evolution
As the core standard of the power industry, DL/T 259-2023 comprehensively upgrades the calibration requirements for sulfur hexafluoride gas density relays. Compared with the 2012 version, this revision mainly reflects three major technical evolution directions:
| Comparison dimensions | DL/T 259-2012 | DL/T 259-2023 |
|---|---|---|
| Scope of application | Pressure type not specified | Pressure type SF6 density relay limited |
| Technical parameters | Set point deviation not specified | New contact resistance and set point deviation requirements |
| Test methods | Temperature compensation test is incomplete | Contact action value temperature compensation test is added |
Key terminology definition analysis
The standard defines 6 core terms, among which rated pressure is defined as the reference pressure value of the equipment under 20℃ standard atmospheric pressure. This parameter directly affects the setting accuracy of the density relay. Typical application case:
The rated pressure of a 500kV GIS device is 0.6MPa. When using the absolute pressure density relay, it needs to be converted to the absolute pressure value of 1.01325+0.6=1.61325bar for calibration according to clause 3.1 of the standard.
Core requirements for metrological performance
Three new key indicators are added in the 2023 version:
- Set point deviation: not exceeding ±1.5% of the range
- Contact resistance: ≤0.5Ω (≤1Ω for the 2012 version)
- Temperature compensation: error ≤2.5% in the range of -25℃~+55℃
Innovation in calibration method
Standard clause 7.3 specifies the step test method for temperature compensation test in detail:
| Temperature point (℃) | Stabilization time | Number of tests |
|---|---|---|
| -25 | ≥2h | 3 cycles |
| 20 | Benchmark value | Benchmark test |
| 55 | ≥2h | 3 cycles |
Suggestions for standard implementation
Four suggestions are put forward for the implementation of the new standard:
- The laboratory needs to be equipped with a precision pressure source that complies with JB/T5528
- On-site calibration should refer to T/CEC414 specification
- Focus on the integrity of the calibration records in Appendix D
- Regularly compare the contact action values under different temperatures
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