GB/T 24840-2018 in English
VALIDTechnical specification for bushings of 1 000 kV AC system
- Issued on:2018-07-13
- Implemented on:2019-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
| Standard No: | GB/T 24840-2018 |
| Document status: | VALID |
| Title in English: | Technical specification for bushings of 1 000 kV AC system |
| Title in Chinese: | 1000kV交流系统用套管技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2018-07-13 |
| Implemented on: | 2019-02-01 |
| Superseding: |
GB/Z 24840-2009 Technical specification for bushing of 1000 kV AC system
|
| ICS Classification: | 29.240.01-Power transmission and distribution networks in general |
| Chinese Classification: | K40-Electric transmission and transformation equipment in general |
| Professional Classification: | GB-National Standard |
| Related Keywords: | gas-insulated bushings
oil-impregnated paper bushings glue-impregnated paper bushings technical specification bushings |
| Related Topics: | Technical Measurement Exchange Group
Test Technology Exchange Group flow system GBT24840 GB/T 24840-2018 |
《GB/T 24840-20181000kV交流系统用套管技术规范》由524（中国电力企业联合会）归口，TC569（全国特高压交流输电标准化技术委员会）执行，主管部门为中国电力企业联合会。
Introduction
Standard Technology Evolution and Background
As the technical specification for key UHV AC transmission equipment, this standard reflects my country's technological accumulation in the field of 1000kV bushings. Compared with the 2009 version, the main technical upgrades include:
| Improvement dimensions | 2009 version | 2018 version | Technical significance |
|---|---|---|---|
| Seismic parameters | Single fortification standard | Fortification for 6/7/8 degrees | Improve reliability in earthquake-prone areas |
| Power frequency tolerance time | 1min | 5min | Strengthen long-term operation stability |
| Partial discharge measurement | 1.05Um/√3 | 1.1Um/√3 | Detection sensitivity increased by 30% |
Analysis of core performance indicators
Insulation performance requirements
The standard specifies differentiated indicators for three types of bushings:
- Oil-impregnated paper bushings: tanδ≤0.4% (20℃)
- Glue-impregnated paper bushings: tanδ≤0.7%
- Gas-insulated bushings: tanδ limit cancelled
Mechanical performance parameters
Cantilever load is divided into two levels:
| Current range (A) | Load I (N) | Load II (N) |
|---|---|---|
| 800-1600 | 3150 | 5000 |
| 2000-3150 | 5000 | 8000 |
Key test methods
Type test process
- Lightning impulse test: positive/negative polarity 15 times each
- Long-term power frequency test: 1100kV for 5min
- Thermal stability test: △tanδ≤0.02%/h
Partial discharge detection
Three-stage voltage method is used:
| Insulation type | 1.1Um/√3(pC) |
|---|---|
| Oil impregnated paper | ≤5 |
| Glue impregnated paper | ≤5 |
Implementation suggestions
Selection considerations
- Areas with seismic intensity ≥7 degrees should use horizontal acceleration 0.3g design
- Composite bushing is preferred in heavily polluted environments
- Oil-SF6 bushing requires double sealing verification
Operation and maintenance management points
The on-site handover test must include:
- Main insulation tanδ measurement (10kV)
- SF6 gas micro-water test (≤250μL/L)
- Sealing inspection (annual leakage rate <0.5%)
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