TB/T 3199.1-2018 in English
VALIDInsulators for overhead contact system of electrified railways - Part 1: Long rod ceramic insulators
- Issued on:2018-07-31
- Implemented on:2019-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$194.00
Introduction
Interpretation of the core content of the standard
Scope of application and technical positioning
This standard is applicable to the industrial frequency single-phase AC 25kV electrified railway contact network system, and specifies the technical requirements for the full life cycle of rod-shaped porcelain insulators. Compared with the 2008 version, the main improvements are:
- Altitude applicable range expanded to 1000m (not specified in the original standard)
- New double insulation structure type
- Added high mechanical strength grade (20kN/25kN) product requirements
Key Technical Parameters Comparison
| Parameter Category | New Contents of the 2018 Version | Corresponding Requirements of the 2008 Version | Technological Evolution |
|---|---|---|---|
| Mechanical Properties | Added 16kN/20kN Post Insulators 70kN/100kN Suspension Insulators | Up to 12kN arm insulators | Adapt to high-tension contact network of high-speed railways |
| Electrical performance | 1600mm creepage distance product Salt density 0.35mg/cm² pollution level | Up to 1400mm creepage distance | Improve adaptability to heavy pollution areas |
| Inspection items | Add low temperature load test Delete separate performance requirements for porcelain parts | Contains 7 separate tests such as porosity of porcelain parts | Turn to overall performance verification |
Typical application scenario analysis
Application cases in high-cold areas
In the Harbin-Dalian high-speed railway project, the QBS27.5/12-1400 double-insulated wrist insulator is used, which has passed:
- -40℃ low-temperature bending test verification
- 1.6 times the safety factor of each mechanical load detection
- Artificial pollution test voltage increased to 36kV
Actual operation shows that its ice flash failure rate is 72% lower than that of the 2008 version of the standard product
Standard Implementation Recommendations
Purchase and Acceptance Points
- Give priority to products with double insulation structure (model contains "S" mark)
- Areas with altitude＞1000m need to perform voltage correction according to GB/T 311.1
- Focus on monitoring the key dimensions of shed outer diameter and arc distance
Maintenance and inspection specifications
It is recommended to establish a three-dimensional inspection file:
| Period | Inspection items | Qualification standards |
|---|---|---|
| Annual | Ultrasonic flaw detection | No defects ≥Φ2mm |
| Overhaul period | Zinc layer thickness | ≥86μm |
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