DL/T 2004-2019 in English
VALIDTechnical specification of DC current transformer
- Issued on:2019-06-04
- Implemented on:2019-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
Introduction
Analysis of the core content of the standard
| Technical dimensions | Electronic transformer | Electromagnetic transformer |
|---|---|---|
| Frequency characteristics | Error of 50Hz-1500Hz≤0.5% | Error of the same frequency band≤3% |
| Step response | Establishment time＜4ms | Not applicable |
| Insulation medium | Composite insulation/gas | Oil immersed/solid |
Key technical requirements
Insulation level： class=instrument>DC current transformer must pass the 1h DC withstand voltage test, of which the test voltage of ±1100kV equipment reaches 1683kV, and the partial discharge is ≤1000pC.
Electromagnetic compatibility: It must meet 13 immunity test requirements, including 4-level electrostatic discharge (8kV) and 3-level radio frequency radiation (10V/m) and other harsh tests.
Selection and implementation suggestions
Electronic DC current transformer is recommended for use in new UHV projects, and its optical fiber transmission system must be equipped with 100% spare fiber cores and attenuation <2dB. For high-cold areas, C2 products with an ambient temperature level of -40℃ should be selected.
Standard Evolution Analysis
This standard unifies the technical specifications of electronic and electromagnetic transformers for the first time. Compared with the GB/T 26216 series standards, it adds:
1. Clarifies the step response time (Tsr＜400μs)
2. Specifies the sampling rate of digital output (10k/50k/96kHz)
3. Strengthens electromagnetic compatibility requirements (newly added GB/T 17626.29 DC port test)
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