GB/T 24847-2021 in English
VALIDTechnical guide on 1000kV AC system voltage and reactive power
- Issued on:2021-03-09
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
| Standard No: | GB/T 24847-2021 |
| Document status: | VALID |
| Title in English: | Technical guide on 1000kV AC system voltage and reactive power |
| Title in Chinese: | 1000kV交流系统电压和无功电力技术导则 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-03-09 |
| Implemented on: | 2021-10-01 |
| Superseding: |
GB/Z 24847-2009 guide on 1 000 kV AC system voltage and reactive power
|
| ICS Classification: | 29.240-Power transmission and distribution networks |
| Chinese Classification: | F20- |
| Professional Classification: | GB-National Standard |
| Related Keywords: | nominal voltage no-excitation voltage regulation
ac system voltage maximum operating voltage voltage regulation analysis voltage regulation range |
| Related Topics: | Test Technology Exchange Group
Voltage work Voltage in English Voltage and conductance system boost Power Technology Power Technology conductance voltage conductance voltage National exchange GBT24847 GB/T 24847-2021 Voltage |
《GB/T 24847-20211000kV交流系统电压和无功电力技术导则》由TC569（全国特高压交流输电标准化技术委员会）归口，主管部门为中国电力企业联合会。
Introduction
Core changes in the standard upgrade
| Technical dimension | GB/Z24847-2009 | GB/T24847-2021 | Significance of the upgrade |
|---|---|---|---|
| Definition of terms | 3 basic definitions | 6 new items including maximum operating voltage and ultra-high voltage | Improve the technical description system |
| Reactive power compensation | General requirements | Add factory power generatorsPhase-advancing capability ≥ 0.97Requirement | Improve system stability |
| Capacitive compensation | Not separately specified | Clearly define the limiting principle of single-group switching voltage fluctuation | Prevent false triggering of voltage regulation |
Analysis of key technical requirements
Voltage deviation control
The standard stipulates that the maximum operating voltage of 1000kV busbar is ≤1100kV (1.1 times the nominal value), and it is allowed to reach 1150kV for a short time under accident conditions. For single-side empty-charge lines, the terminal voltage is ≤1150kV within 30 minutes.
Reactive compensation configuration
- Layered and zoned balance: the total capacity of high/low voltage reactors should compensate for the line charging power
- Dynamic standby: generators and SVC/SVG need to retain 20% dynamic adjustment margin
- New energy access: the sending-end system needs to be configured with an additional 15% reactive standby capacity
Key points for transformer voltage regulation implementation
Typical case: A UHV station uses an on-load voltage regulation transformer with a voltage regulation range of ±5% (9 gears in total), and cooperates with SVG to achieve a voltage control accuracy of ±1%.
Standard recommendation:
- The rated voltage of the high-voltage side of the step-up transformer is 1050-1100kV
- The medium-voltage side of the step-down transformer is recommended to be 110% of the nominal voltage
- No-excitation voltage regulation usually adopts ±4×1.25% grading
Operation adjustment strategy
When the voltage exceeds the limit, it should be adjusted according to the following priority:
| Steps | Adjustment means | Response speed |
|---|---|---|
| 1 | Generator reactive output | Seconds |
| 2 | SVG/SVC switching | 100ms |
| 3 | Transformer tap | Minute level |
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