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0102030405
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12kV Outdoor Pole‑Mounted SF6 Circuit Breaker

12kV Outdoor Pole‑Mounted SF6 Circuit Breaker

General Description

The 12 kV outdoor pole‑mounted SF6 circuit breaker is a new‑generation product developed to meet the new grid‑access requirements for primary‑secondary integrated pole‑mounted switches of State Grid of China. Its configuration fully complies with State Grid primary‑secondary integration specifications, suitable for centralized procurement and mass production by State Grid.

Featuring compact structure and reasonable layout, this switch provides complete functions with all performance indicators satisfying State Grid primary‑secondary integration requirements. It is equipped with protection CT, zero‑sequence CT and zero‑sequence voltage sensor with unified parameters. It delivers wide measuring range, high measurement accuracy and high reliability. Complete analog quantities facilitate accurate identification of various line faults.

Service Conditions

‑ Normal operating conditions;

‑ Ambient air temperature: ‑40 ℃ ~ +40 ℃;

‑ Altitude: no more than 3000 m;

‑ Ambient air may be polluted by dust, smoke, corrosive gas, steam or salt mist, pollution class: Class IV;

‑ Wind speed not exceeding 34 m/s (equivalent to 700 Pa on cylindrical surfaces);

‑ Vibration and seismic shocks originating outside switchgear and controlgear shall be negligible;

‑ Amplitude of electromagnetic interference induced in secondary system shall not exceed 1.10 kV.

Compliance Standards

‑ GB 1984‑2014 High‑voltage alternating‑current circuit‑breakers

‑ GB/T 11022‑2011 Common specifications for high‑voltage switchgear and control‑gear standards

‑ GB 20840.1‑2010 Instrument transformers — Part 1: General requirements

‑ GB 20840.2‑2014 Instrument transformers — Part 2: Additional requirements for current transformers

    Preview Data Contact us
    Outline and Installation Dimension Drawing
    Structural Features

    Item Specification
    Rated Voltage 12 kV
    Rated Frequency 50 Hz
    Rated Current 630 A
    Rated Short-time Withstand Current 20 kA
    Rated Short-time Withstand Current Duration 4 s
    Rated Peak Withstand Current 50 kA
    Rated Short-circuit Closing Current (Peak) 50 kA
    Rated Cable Charging Current 25 A
    Rated Short-circuit Breaking Current 20 kA
    Rated Operating Sequence O-0.3s-CO-180s-CO
    Rated Contact Pressure (at 20°C) 0.35 MPa
    Minimum Contact Pressure (at 20°C) 0.25 MPa
    Rated Power Frequency Withstand Voltage (1 min) Phase to Earth: 42 kV
    Across Open Contacts: 48 kV
    Rated Lightning Impulse Withstand Voltage (BIL) Phase to Earth: 75 kV
    Across Open Contacts: 85 kV
    Rated Mechanical Endurance Circuit Breaker: 10000 operations (Class E2)
    SF6 Gas Leakage Rate ≤0.5%
    Rated Closing / Opening Coil Voltage DC24V
    Total Weight 175 kg
    Overall Dimensions (L×W×H) 1015×950×580 mm
    Closing Time Rated Operating Voltage: ≤50 ms
    Maximum Operating Voltage: 40~60 ms
    Minimum Operating Voltage: 40~60 ms
    Opening Time Rated Operating Voltage: 40±5 ms
    Maximum Operating Voltage: 35~55 ms
    Minimum Operating Voltage: 35~55 ms
    Closing Synchronism ≤2 ms
    Opening Synchronism ≤2 ms
    Closing Speed 2.6±0.2 m/s
    Opening Speed 2.6±0.2 m/s
    Contact Gap 38±2 mm
    Contact Stroke 22±1 mm
    Main Circuit Resistance (excluding cable) ≤130 μΩ
    Energy Storage Motor Power 150W DC24V

    1. The 12 kV pole‑mounted SF₆ circuit‑breaker has a rated current / short‑circuit breaking current of 630A‑20kA, adopting an electric spring operating mechanism with DC24V operating voltage. Insulation resistance to earth is greater than 1000 MΩ.
    2. The circuit‑breaker tank is made of 3 mm‑304 stainless steel with protection class IP67. It is equipped with visible‑type disconnector, obvious opening‑closing position indicator. The indicator and operating mechanism can be reliably linked and operated. It shall adopt 12 mm stainless steel lifting lugs, with grounding terminals equipped with grounding signs. No long‑term storage shall cause water condensation inside the tank. The equipment is equipped with lifting rings for hoisting. When using the lifting rings for equipment hoisting, keep the lifting hook free from friction against any components, to avoid scratching the surface coating of the breaker body during hoisting. The lifting rings are made of 304 stainless steel, with wind‑resistant and corrosion‑resistant performance. The internal components shall keep clear, and the cabinet contents shall comply with relevant national standard requirements.
    3. The breaker is equipped with three‑phase current transformers and zero‑sequence current transformers; current transformer ratios: protection CT 600/1A; zero‑sequence CT 20/1A. Accuracy classes: protection class 0.5 for measurement; protection class 5P10. For one‑phase input 1A rated current: measurement error ≤ 3%; when primary current is 100A, table error ≤‑10%. Zero‑sequence CT accuracy class 3P.Matching requirements: phase current ≥ 1A (600/1TA), ≥2.5VA (600A/5A); zero‑sequence ≥0.5VA. Meets matching requirements (cable length 12 m, matched with FTU and line‑monitoring terminals), with metering calculation and fixed‑value setting functions.
    4. The acquisition and control unit adopts box‑type structure with spring latches. The breaker is internally fitted with 1‑set current transformers, providing Ia, Ib, Ic, I0 current signals; 1‑set zero‑sequence voltage sensor is also built‑in. Aviation plugs, wiring ports and wiring terminals adopt fully‑enclosed waterproof structures. Cable terminals shall be treated with insulating materials.