GB/T 37012-2018 in English
VALIDTechnical specification of earthing equipment for high-voltage direct current(HVDC) transmission using voltage sourced converters(VSC)
- Issued on:2018-12-28
- Implemented on:2019-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
《GB/T 37012-2018柔性直流输电接地设备技术规范》由TC324（全国高压直流输电工程标准化技术委员会）归口，主管部门为中国电力企业联合会。
Introduction
Analysis of the core content of the standard
This standard specifies the technical requirements for four types of grounding equipment for voltage source converter (VSC) flexible DC transmission systems:
- Connecting transformer neutral point grounding resistor: typical resistance 2000-15000Ω
- DC side grounding resistor: typical resistance 1000-6000kΩ
- Star-connected reactor grounding equipment: including linear/saturated reactor
- Grounding transformer equipment: ZN type or YNd type connection
Comparison of key technical indicators
| Equipment type | Resistance tolerance | Temperature limit (℃) | Key test items |
|---|---|---|---|
| Neutral point grounding resistor | ±5% | 250-650 | Temperature rise test, impulse current test |
| DC side grounding resistor | ±5% | 250-650 | DC withstand voltage test (2 times rated voltage) |
| Star-connected reactor | - | According to GB/T1094 | Zero-sequence impedance measurement |
| Grounding transformer | - | According to GB/T1094 | Short-circuit withstand capacity test |
Typical application scenario analysis
Modular multilevel converter (MMC) system
In the ±500kV Zhangbei flexible DC power grid project, the star-connected reactor grounding equipment is used to achieve:
- Suppress DC bias current (typical value ≤3%A)
- Withstand short-circuit current of 20kA/100ms in case of fault
- Zero-sequence reactance is controlled in the range of 5-10Ω
Standard Evolution and Innovation
This standard systematically solves the three major technical problems of VSC-HVDC grounding equipment for the first time:
- Magnetic saturation problem of reactor caused by DC bias current
- Resistor inductance control under high frequency conditions (requirement L<0.02R/2πfh)
- Stability of composite insulation materials at high temperatures of 450-650℃
Engineering Implementation Recommendations
Key Points for Selection and Design
| Parameters | Calculation formula | Example value |
|---|---|---|
| Hot resistance value | Rhot=R25/(1-α25×Δθ) | 5500Ω(+8%) |
| Equivalent test current | It=√(P/R), P=W/t1 | 1200A/3s |
Insulation and operation requirements
- When the altitude is>1000m, the insulation level must be corrected according to GB/T311.1
- In areas with pollution level ≥d, the casing anti-pollution design should be strengthened
- The resistance deviation between resistor units is ≤1%
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