DL/T 2045-2019 in English
VALIDGuideline for ferromagnetic oscillation control technology of neutral non-grounded system
- Issued on:2019-06-04
- Implemented on:2019-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
| Standard No: | DL/T 2045-2019 |
| Document status: | VALID |
| Title in English: | Guideline for ferromagnetic oscillation control technology of neutral non-grounded system |
| Title in Chinese: | 中性点不接地系统铁磁谐振防治技术导则 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2019-06-04 |
| Implemented on: | 2019-10-01 |
| Professional Classification: | DL-Electricity |
| Related Topics: | ferromagnetic
neutral grounding ferromagnetic prevention not only ferromagnetic Prevention strategy ferromagnetic Grounding standard neutral point Characteristics of ferromagnetic resonance Subway punctuality rate dl/t2011-2019 dl/t1966-2019 dl/t5784-2019 dl/t5787-2019 dl/t 5786-2019 dl/t 799 -2019 dl/t 5796-2019 |
Introduction
Core term definitions
| Resonance type | Frequency characteristics | Voltage performance | Overvoltage multiple |
|---|---|---|---|
| Divided frequency resonance | <50Hz | Three phases increase simultaneously | ≤2 timesphase voltage |
| Power frequency resonance | 50±5Hz | Two increases and one decrease | ≤2.5 timesphase voltage |
| High frequency resonance | >50Hz | Three phases increase simultaneously | ≤3 timesphase voltage |
Prevention and control technology system
Silicon carbide detuning device must meet the following requirements in a 10kV system:
• Voltage 280-350V (peak) at power frequency 1mA
• Non-linear coefficient 0.3-0.45
• Graded insulation PT must be equipped with a voltage-limiting gap
Microcomputer detuning deviceKey parameters:
• Damping resistor input time 30-200ms
• Sampling rate ≥10kHz
• Waveform recording function is required
Technology optimization strategy
- When the system capacitance current is <7A, high-resistance grounding is preferred
- Pre-adjusted arc suppression coils are recommended in frequent resonance scenarios
- 4PT wiring requires open delta short-circuit protection
Performance test specifications
| Test conditions | Oscillation time | Voltage fluctuation limit |
|---|---|---|
| 1.0Ur | ≤0.2s | △U0≤10%or△U≤5% |
| 1.1Ur | ≤0.5s | △U0≤10%or△U≤5% |
Note: The test must be carried out within class=instrument>Electromagnetic voltage transformerSaturation inflection point voltage ≥1.9Uφ
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