DL/T 1954-2018 in English
VALIDCalibration specification of partial discharge detector based on transient earth voltage
- Issued on:2018-12-25
- Implemented on:2019-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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$272.00
$272.00
Introduction
Interpretation of the core content of the standard
This standard specifies the metrological characteristic requirements and calibration methods of the transient ground voltage partial discharge detector, and is applicable to the calibration of equipment in the 3MHz-100MHz frequency band.
Analysis of key technical indicators
| Metering characteristics | Technical parameters | Allowable error |
|---|---|---|
| Frequency band range | 3MHz-100MHz | ≤±10% |
| Amplitude measurement | dBmV unit | ≤±3dBmV |
| Pulse repetition rate | ≥10kHz | ≤±5% |
| Sensitivity | Noise reference 2 times | Indication ratio≥1 |
Calibration Implementation Points
Typical Calibration Process
- Safety Performance Check: Including 20MΩ insulation resistance test and 2kV/1min withstand voltage test
- Frequency Characteristics Calibration: Using a sine wave signal generator, measure the -6dBmV cutoff point
- Amplitude Linearity Calibration: Measure 5 points every 6dBmV from 0dBmV
- Pulse Repetition Rate Verification: Compare the difference between the standard generator and the actual measurement value
Measurement Uncertainty Analysis
Take the 40dBmV calibration point as an example:
- Uncertainty introduced by the standard: 0.0577dBmV (Class B)
- Uncertainty caused by resolution: 0.5773dBmV (Class B)
- Repeatability uncertainty: 0.4216dBmV (Class A)
- Combined expanded uncertainty: 1.4dBmV (k=2)
Standard evolution and implementation suggestions
Technical development background
This standard was first released (2018), filling the gap in the calibration standard for TEV method detectors and forming a supporting system with DL/T846.10-2016.
Application Recommendations
- Calibration cycle: 1 year is recommended, the cycle should be shortened in harsh environments
- Equipment selection: give priority to detectors with automatic calibration function
- Field application: pay attention to the control of ambient temperature (15-25℃) and humidity (20-80%)
Sample only — not a preview of DL/T 1954-2018
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