DL/T 2859-2024 in English
VALID12kV primary and secondary fusion pole switch
- Issued on:2024-12-25
- Implemented on:2025-06-25
- File Format:PDF
- Delivery:Via email within 2~4 business days
$436.00
| Standard No: | DL/T 2859-2024 |
| Document status: | VALID |
| Title in English: | 12kV primary and secondary fusion pole switch |
| Title in Chinese: | 12kV一二次融合柱上开关 |
| 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: | 29.130.10-High voltage switchgear and controlgear |
| Chinese Classification: | K43-High voltage switchgear |
| Professional Classification: | DL-Electricity |
| Related Keywords: | secondary fusion pole switch introduction interpretation
technical dimensions circuit breaker requirements load switch requirements load test low temperature test impulse immunity test |
Introduction
Interpretation of the core content of the standard
DL/T 2859-2024 is my country's first industry standard for 12kV primary and secondary integrated pole-mounted switches, which specifies the performance requirements of equipment in harsh environments from -40℃ to +40℃. The standard innovatively integrates components such as circuit breakers/load switches, feeder terminals, and transformers to achieve key technical indicators such as fault location accuracy ≤10 meters and permanent magnet mechanism action time ≤70ms.
Key technical requirements
| Technical dimensions | Circuit breaker requirements | Load switch requirements |
|---|---|---|
| Mechanical life | ≥10000 times (vacuum) | ≥5000 times (SF6) |
| Protection level | Common box type IP67/pillar type IP55 | |
| Fault handling time | ≤70ms(permanent magnet) | N/A |
Technological Evolution of Transformers
The standard innovatively proposes three parallel solutions for transformer technologies:
- Electromagnetic transformer: secondary current 1A/5A, accuracy 0.5S level
- Analog electronic: output voltage 1V/0.2V, temperature range -40~70℃
- Digital electronic: supports GB/T 20840.9 digital interface
Typical cases show that the zero-sequence measurement error of electronic transformer can still be controlled within 10% at 120% rated current.
Complete test system
The standard establishes 10 major test items, among which the key innovations include:
- Lightning impulse immunity test: 100% remote control success rate is guaranteed after 5 impulses of positive and negative polarity
- High and low temperature test: Maintain level 1 measurement accuracy under -40℃/6h conditions
- Power supply load test: Supercapacitors need to support 15 minutes of terminal operation
Implementation suggestions
Three suggestions are put forward for the implementation of the standard:
- Give priority to the fully sealed common box type structure, and the diameter of the grounding bolt ≥12mm
- The reclosing parameters are recommended to be set to a three-time sequence of 0.5s+60s+60s
- The aviation plug should have the function of self-shorting the CT terminal to prevent the risk of open circuit
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