# China Power & Grid Engineering Profile

> Preliminary country engineering reference. Connection voltage, short-circuit duty, earthing and regulatory approval require current project-specific confirmation from the local TSO/DSO.

**Canonical:** https://voltformer.com/country-profile/china - markdown: https://voltformer.com/country-profile/china.md - ISO: CN

## Electrical system

- Frequency: 50 Hz
- Transmission voltage candidates: 1100, 1000, 750, 500, 330, 220, 110 kV
- Distribution voltage candidates: 35, 20, 10, 6 kV
- Low-voltage candidates: 400, 230 V
- Typical vector groups: Dyn11, Ynd11, YNd11
- Typical tap range: ±2x2.5% veya ±8x1.25% OLTC

## Power quality and grid operating limits

- Normal frequency operational tolerance: ±0.2 Hz
- Steady-state voltage tolerance: ±7 %
- Maximum continuous THD-V at MV PCC: ≤ 4 %
- Maximum negative sequence voltage unbalance: ≤ 2 %
- Grid code power factor range at PCC: 0.90 cap - 0.95 ind

## Substation short-circuit and earthing

- Typical MV bus symmetrical fault rating: 31.5 kA RMS (1s / 3s)
- Typical HV substation breaking capacity: 63 kA RMS
- MV neutral earthing regime: low-resistance
- LV customer earthing system: TN-C-S

## Dielectric insulation coordination

- MV Lightning Impulse Withstand (BIL): 170 kV peak (1.2/50 µs)
- MV Power Frequency Withstand (1 min): 70 kV RMS (50/60 Hz)
- Minimum specific creepage distance (SPS): 25 mm/kV phase-to-phase
- IEC 60815 pollution severity classification: Class III (Heavy)

## Electromechanical and environmental design

- Design peak ground acceleration (PGA): 0.25 g (IEEE 693 / Eurocode 8)
- Basic design wind speed: 32 m/s (~115 km/h)
- Substation acoustic noise limit at 1m: ≤ 58 dBA
- Extreme minimum design ambient temperature: -25 °C
- Maximum 24-hour daily average ambient temperature: 30 °C
- Maximum solar radiation heat flux: 1000 W/m²
- Atmospheric corrosivity category (ISO 12944-2): C3 (Medium)
- MV bushing connector interface standard: GB/T 4109 / EN 50180 (Interface A/B/C)

## Standards and efficiency

- Standards/codes: GB/T 1094, GB 20052-2024, DL/T 572, State Grid Standards
- Regulatory standard code: GB 20052-2020 (Grade 2 Energy Efficiency)
- Benchmark minimum efficiency (PEI / 1000 kVA): 99.52 %
- Regulatory enforcement: mandatory
- Efficiency regulation notes: Chinese National Standard GB 20052-2024 Level 1/2 Mandatory Efficiency

## Grid energy economics and carbon intensity

- Benchmark industrial electricity tariff: $0.088 / kWh (TCO capitalized loss A & B factor evaluation)
- Grid carbon emission intensity: 545 g CO2eq/kWh (Scope 2 lifecycle emissions assessment)
- National renewable energy share: 32.8 % (grid inertia & inverter-based resource impact)
- Primary official statistical source: NEA / State Grid / IEA

## Advanced engineering calculation parameters

- Substation network X/R ratio: 13 (IEC 60909 fault impedance modeling)
- Dynamic peak short-circuit factor (κ per IEC 60909): 1.8 (ip = κ · √2 · Ik'' electrodynamic force)
- Regional reference apparent soil resistivity (ρ): 200 Ω·m (IEEE 80 / IEC 61936-1 substation earthing)
- Recommended transformer harmonic K-factor rating: K-9 (ANSI/IEEE C57.110 eddy derating)

## Official public regulatory and grid authorities

- [State Grid - State Grid Corporation of China (SGCC) Technical Standards](https://www.sgcc.com.cn) (transmission-operator)
- [NEA - National Energy Administration of China (NEA) Regulations](https://www.nea.gov.cn) (energy-regulator)

## Grid operators

- State Grid (SGCC)
- China Southern Power Grid (CSG)
- Inner Mongolia Power Group

## Climate design reference

- Reference ambient: 40 °C
- Maximum design ambient: 48 °C
- Standard altitude basis: 1000 m
- Notes: World's largest 1100 kV UHVDC & 1000 kV UHVAC grid, Gobi desert mega-renewable bases, widespread amorphous metal core adoption.

## Typical applications

- Gobi Desert Mega-Scale 100+ GW Renewable Bases
- 1000 kV UHVAC & ±1100 kV UHVDC Converter Substations

## Safe project candidates

- Nominal voltage candidates: 35, 20, 10, 6, 1100, 1000, 750, 500, 330, 220, 110 kV
- LV utilization-voltage candidates (line-to-line and/or line-to-neutral; confirm the transformer's rated terminal voltage and phase configuration): 400, 230 V
- Vector group candidates: Dyn11, Ynd11, YNd11
- Automatic nominal voltage: withheld - point of connection required

## Mandatory project verification

- pointOfConnectionVoltage
- prospectiveShortCircuitCurrent
- systemEarthingAndNeutral
- insulationCoordination
- protectionCoordination
- powerQualityAndHarmonics
- siteAmbientAndAltitude
- seismicWindPollution
- utilityApproval

Machine data: https://voltformer.com/api/v1/countries/CN - all profiles: https://voltformer.com/country-grid-standards.json - grid checker: https://voltformer.com/grid-standards