DL/T 437-2024 in English
VALIDHigh Voltage Direct Current Grounding Electrode Code
- Issued on:2024-12-25
- Implemented on:2025-06-25
- File Format:PDF
- Delivery:Via email within 2~4 business days
Price(USD)：
$409.00
$397.00
$397.00
| Standard No: | DL/T 437-2024 |
| Document status: | VALID |
| Title in English: | High Voltage Direct Current Grounding Electrode Code |
| Title in Chinese: | 高压直流接地极技术导则 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 2~4 business days |
| Issued on: | 2024-12-25 |
| Implemented on: | 2025-06-25 |
| ICS Classification: | 29.100-Components for electrical equipment |
| Professional Classification: | DL-Electricity |
| Related Keywords: | high voltage direct current grounding electrode code introduction core changes
vertical electrode electrode ≤50a/m² 437-2024 electrode type mainly design implementation new electrode layout plan marine |
Introduction
Core changes in the standard revision
| Technical dimensions | DL/T 437-2012 | DL/T 437-2024 |
|---|---|---|
| Electrode type | Mainly traditional horizontal ring type | Five new types including vertical/deep well/marine grounding electrodes |
| Overflow density limit | Unspecified water area index | Specified seawater grounding electrode ≤50A/m² (with fence) |
| Pipeline corrosion assessment | Polarization potential shift method | Annual average corrosion rate ≤0.01mm/a |
Analysis of key technical indicators
Dynamic limit of ground resistance
The new standard distinguishes between long-term and short-term operation modes:
- Long-term operation (>thermal time constant): must meet the thermal stability condition of formula (1)
- Short-term operation can be replaced by temperature rise/potential difference verification
Engineering application example
A ±800kV project uses deep well grounding electrodes. The soil model is corrected through injection test, which reduces the ground resistance calculation error from 12% to 3%.
Key points of design implementation
New electrode layout plan
- Marine grounding electrode: Priority will be given to projects within 3km of the coastline
- Compact grounding electrode: Current sharing resistor is required
- Vertical electrode: Exhaust device is required when the burial depth is >100m
Operation and maintenance management requirements
| Periodic | Inspection items | New technical requirements |
|---|---|---|
| 10 years | Corrosion inspection of feeding elements | New ampere-hour evaluation method |
| Real time | Online monitoring | Must comply with DL/T 2026 specifications |
Sample only — not a preview of DL/T 437-2024
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