Primary and Secondary Deeply Integrated Pole-Mounted Circuit Breaker
Product Overview
The integrated primary–secondary deeply fused standardized pole-mounted circuit breaker combines the vacuum circuit breaker unit, feeder terminal, power supply voltage transformer, solid-insulated pole assembly, and connecting cables into a single compact device. This product strictly complies with the “Standardized Design Scheme for 12 kV Primary–Secondary Integrated Pole-Mounted Circuit Breakers and Distribution Automation Terminals (FTU) (2021 Edition)” and is suitable for 12 kV three-phase power systems. It is primarily used to switch load currents, overload currents, and short-circuit currents. Its adaptive multi-feeder, multi-connection distribution network architecture enables on-site fault line selection, fault location, and isolation for single-phase-to-ground faults. In addition, the primary closing operation of the outgoing switch at the distribution substation can achieve section-level localization of permanent short-circuit faults and restore power supply after transient faults; while the secondary reclosing function enables automatic local isolation of permanent short-circuit faults and restoration of power supply to upstream sections affected by the fault.
Terms of Use
● Altitude not exceeding 2,000 meters; Pollution degree: Level IV.
● Ambient air temperature: -45°C to +40°C; daily temperature range: 25°C.
● Wind speed shall not exceed 35 m/s; seismic intensity shall not exceed Grade 8.
● Areas free from flammable, explosive, or chemically corrosive hazards.
Implementation Standard
GB 11022-1999 “Common Technical Requirements for Standards of High-Voltage Switchgear and Control Equipment”
GB 311.1-1997 “Insulation Coordination for High-Voltage Transmission and Transformation Equipment”
GB 3309-1989 “Mechanical Tests of High-Voltage Switchgear at Ambient Temperature”
GB 1208-2006 “Current Transformers”
GB/T 1984-2024 “High-Voltage AC Circuit Breakers”
GB/T 11022 “Common Technical Requirements for Standards of High-Voltage Switchgear and Control Equipment”
GB/T 20840.7-8 “Electronic Voltage/Current Transformers”
GB/T 4208 “Ingress Protection Rating (IP Code)”
GB/T 7261-2000 “Basic Test Methods for Relays and Devices”
DL/T 593 “Common Technical Requirements for High-Voltage Switchgear”
DL/T 721 “Remote Terminal Units for Distribution Automation”
DL/T 844-2003 “General Technical Specifications for 12 kV Maintenance-Reduced Outdoor Distribution Switchgear”
DL403-2000 “Technical Specifications for Ordering 12–40.5 kV High-Voltage Vacuum Circuit Breakers”
T/CES 018-2019 “Technical Specifications for 10 kV and 20 kV AC Sensors in Distribution Networks”
Main Features
● The integrated primary–secondary fusion unit encapsulates the vacuum arc-extinguishing chamber, current transformer, and voltage sensor in a single, monolithic casting, achieving compact size and maintenance-free operation. The circuit breaker can be combined with an isolating switch to form a combined circuit breaker, can be equipped with an intelligent controller, features a built-in PT-powered auxiliary power supply, and is easy to install on site.
● The primary–secondary deep-integration device comprises the main unit, a power-tapping module, a signal-processing unit, and a front-end data-acquisition unit. The front-end data-acquisition unit continuously acquires real-time measurements of the three-phase line currents, three-phase voltages, zero-sequence voltage, zero-sequence current, and the status of the circuit-breaker.
● Integrated primary-and-secondary pole-mounted circuit breaker (deeply integrated) Equipped with remote signaling, remote measurement, remote control, and remote adjustment (“four remotes”), it can monitor in real time the three-phase voltage, current, power, energy, and zero-sequence voltage and current of distribution network lines, process and analyze the data to identify fault types, and execute corresponding switching operations to quickly isolate faults on-site while protecting the power supply to non-faulted areas. At the same time, it enables two-way communication with the distribution network master station for collected information, fault information, processing results, and distribution network data, thereby completing data acquisition, processing, uploading, and execution functions.
Technical Specifications
Circuit Breaker Performance Parameters
Project |
Unit |
Numerical value |
Rated voltage |
kilovolt |
12 |
Rated frequency |
Hertz |
50 |
Rated current |
A |
630 |
Rated short-circuit breaking current |
kA |
20 |
Rated Peak Withstand Current (Peak) |
kA |
50 |
Rated short-time withstand current/duration |
kA/S |
April 20 |
Rated short-circuit making current (peak) |
kA |
50 |
Mechanical life |
times |
10000 |
Rated short-circuit breaking current breaking operations |
times |
30 |
Power-frequency withstand voltage (1 min): (wet) and (dry), phase-to-phase, phase-to-ground, and across the break. |
kilovolt |
34/42/48 |
Lightning impulse withstand voltage (peak value), phase-to-phase, phase-to-ground/open circuit |
kilovolt |
75/85 |
1-minute power-frequency withstand voltage for the secondary circuit |
kilovolt |
2 |
Mechanical Characteristic Parameters
Project |
Unit |
Numerical |
Contact opening distance |
mm |
9±1 |
Contact overtravel |
mm |
2–2.5 |
Trip speed |
m/s |
1.2±0.2 |
Closing speed |
m/s |
0.8±0.2 |
Contact closing bounce time |
milliseconds |
≤2 |
Phase-to-phase center distance |
mm |
340 ± 1.5 |
Three-phase opening and closing non-synchronization |
milliseconds |
≤2 |
Resistance of each phase conductive circuit |
microohm |
<80 |
External mounting dimensions
Previous
Contact Us
0411-83167110
No. 95, West Section of Shiji Road, Pulandian District, Dalian City, Liaoning Province
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