DL/T 357-2019 in English
VALIDSpecifications for traveling wave fault location devices for transmission lines
- Issued on:2019-06-04
- Implemented on:2019-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
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| Standard No: | DL/T 357-2019 |
| Document status: | VALID |
| Title in English: | Specifications for traveling wave fault location devices for transmission lines |
| Title in Chinese: | 输电线路行波故障测距装置技术条件 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2019-06-04 |
| Implemented on: | 2019-10-01 |
| ICS Classification: | 29.240-Power transmission and distribution networks |
| Chinese Classification: | K45-Relay protection and automatic device |
| Professional Classification: | DL-Electricity |
| Related Keywords: | wave fault location devices
actual fault tower location wave data fault point transmission lines introduction standard overview |
Introduction
Standard Overview and Technical Evolution
DL/T 357-2019, as the core standard of the power industry, replaces the 2010 version and puts forward stricter technical requirements for traveling wave ranging devices. The main upgrades include: Network security protection function (newly added Section 4.3.12), Electromagnetic compatibility requirements (adding pulse magnetic field and damped oscillation magnetic field tests), Communication protocol (mandatory DL/T 860 protocol) and other 15 technical improvements.
Analysis of key technical requirements
4.1 Environmental adaptability
| Parameters | 2010 Edition | 2019 Edition |
|---|---|---|
| Operating temperature | -10℃~+55℃ | -25℃~+70℃ (extended) |
| Storage temperature | Unspecified | -25℃~+55℃ |
| Electromagnetic compatibility | 6 tests | 9 tests (newly added pulsed magnetic field, etc.) |
4.4 Core Performance Indicators
- Range measurement error: two-terminal method ≤500m or 0.5% (DC line transition resistance ≤300Ω)
- Time synchronization: timing error <1μs, timing error <1μs/3min
- Sampling frequency: ≥1MHz (supports 4ms traveling wave data recording)
Implementation points and cases
Typical application scenarios
In a 500kV line lightning fault, The traveling wave ranging device calculated the fault point to be 128.6 km from the M end through the double-end method (M end timestamp: 2023-05-12T14:23:45.123456, N end: 2023-05-12T14:23:45.123892), which is only 82 meters away from the actual fault tower location.
Comparison of old and new standards
| Difference dimensions | DL/T 357-2010 | DL/T 357-2019 |
|---|---|---|
| Network security | No requirement | Identity authentication/access control/data integrity（GB/T 22239） |
| Communication protocol | Optional | MandatoryDL/T 860 |
| Time error | Unquantified | Explicit 1μs accuracy |
Inspection and implementation recommendations
- Type test: Focus on verifying the newly added pulse magnetic field immunity (GB/T 17626.9) and network security functions
- On-site installation: Ensure the impedance matching of the CT secondary side signal extraction line (4.11.b clause)
- Operation and maintenance management: It is recommended to establish a traveling wave ranging master station system to realize multi-device collaborative analysis
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