DL/T 1416-2015 in English
VALIDGeneral Technical Specifications for Ultrasonic Based Partical Discharge Tester
- Issued on:2015-04-02
- Implemented on:2015-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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Introduction
Analysis of the technical framework of the standard
This standard systematically specifies the technical requirements for the entire life cycle of the ultrasonic partial discharge tester. The core content covers:
| Technical dimensions | Key indicators | Test methods |
|---|---|---|
| Frequency characteristics | 20kHz-500kHz range | 10-point frequency sweep test |
| Sensitivity | ≥1 (2 times the initial value excitation) | Standard sound intensity meter comparison method |
| Stability | 4-hour drift | Continuous loading test | |
| EMC immunity | 7 types of electromagnetic compatibility tests | GB/T17626 series |
Detailed explanation of core performance requirements
4.3.2 Measurement error system
The standard constructs a three-dimensional error evaluation system:
- Frequency error: ±20% allowable deviation, which must meet the standard within the range of center frequency ± bandwidth
- Amplitude linearity: The deviation does not exceed ±20% within the full range
- Dynamic response: The output ratio under 2 times excitation is ≥1
【Application Example】In the detection of a substation, The amplitude deviation of the class=instrument>non-contact sensor measured at a frequency of 300kHz was 18%, which was within the limit but close to the threshold. Annual calibration is recommended.
Key points for implementation of the standard
6.2 Special circumstances for type inspection
- Targeted testing of relevant items is required when design changes are made
- Double sampling rule: when one unit fails for the first time, 6 units must be retested
- Electromagnetic compatibility items must include power frequency magnetic field immunity (Level 4)
Daily operation and maintenance suggestions
| Periodic | Maintenance items | Reference clauses |
|---|---|---|
| Monthly | Sensitivity verification | 4.3.2.3 |
| Quarterly | Amplitude linearity check | 4.3.2.2 |
| Annually | Full set of EMC performance tests | 4.3.4 |
Technology evolution analysis
Compared with the earlier versions, the 2015 version has the following major improvements:
- Added clear definitions of contact sensors and non-contact sensors
- Introduced dBmV as a standardized output unit (zero decibel reference 1mV)
- Battery-powered devices have a clear requirement for battery life of ≥5h
- MTBF indicator increased to 1000 hours
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