SIEMENS 40.5kV 3AE8 Solid Sealed Series Vacuum Circuit Breaker

SIEMENS 40.5kV 3AE8 Solid Sealed Series Vacuum Circuit Breaker

Basic and Product Positioning

Overview

The Siemens 40.5kV 3AE8 solid sealed series vacuum circuit breaker product manual (order number: SIEA-B80012-00-5DCN) introduces the new generation of vacuum circuit breakers developed for the Chinese market, which integrates German technology. It features a fully solid sealed pole design (vacuum arc extinguishing chamber, primary circuit, insulation rod fixed to epoxy resin pole), high mechanical life (30000 times), and strong breaking capacity (rated short-circuit breaking current 31.5kA). Key technical parameters include rated voltage of 40.5kV, rated current of 1250A, and first trip opening time ≤ 30ms. It can be widely used in power grids, power plants, metallurgy, petrochemicals and other distribution fields

2. Product application areas

Power grid system: As the core equipment of power distribution, it ensures the stable operation of the power grid

Power generation enterprises: switch control and protection of internal distribution circuits in power plants

Heavy industry sector: Distribution protection for high load industrial scenarios such as metallurgy and petrochemicals

Urban infrastructure: power distribution systems for urban rail transit, large buildings, and other infrastructure

Core structure and characteristics of the product

1. Three core structures and advantages

Structure name, components, core advantages

High insulation strength material and precision contacts for vacuum arc extinguishing chamber 1. Strong short-circuit current breaking ability, suitable for rated short-circuit breaking current of 31.5kA;

2. Low contact resistance, reducing operating losses;

3. Excellent vacuum sealing, ensuring long-term reliable operation;

4. The average cut-off value is small, reducing the harm of cut-off voltage;

5. The contact burns less, extending its service life;

6. High insulation strength, able to withstand 95kV 1-minute power frequency voltage and 185kV lightning impulse voltage

Fully sealed pole vacuum arc extinguishing chamber, primary conductive circuit, insulation rod, epoxy resin shell 1. The primary conductive circuit is completely isolated from the external environment, with strong resistance to pollution and corrosion;

2. Avoid the influence of external dust and moisture on core components and achieve the requirement of "maintenance free";

3. Compact structure, reducing installation space occupation

Modular operating mechanism energy storage components, opening and closing drive components 1. Advanced process treatment, high resistance to pollution and corrosion, suitable for complex environments;

2. Simple operation logic, high reliability, and minimal maintenance frequency during the lifecycle;

3. Energy storage time ≤ 15s, meeting the needs of fast operation

2. Key performance highlights

High reliability: The mechanical lifespan can reach up to 30000 times, far exceeding that of ordinary vacuum circuit breakers, reducing the frequency of equipment replacement; The rated short-circuit breaking current has a breaking frequency of 50/E2/S2 times, meeting the breaking requirements for multiple short-circuit faults.

Quick response: The first trip opening time is ≤ 30ms, the closing time is ≤ 60ms, and the arcing time is ≤ 15ms, which can quickly cut off the fault current and reduce the impact range of the fault.

Precise control: The asynchronous opening of three-phase contacts is ≤ 2ms, and the bouncing time of contact closing is ≤ 3ms, ensuring the synchronization of three-phase operations and avoiding additional wear caused by contact bouncing.

Complete technical parameter table

Technical parameter numerical notes

Rated voltage 40.5kV-

Rated frequency 50/60Hz, suitable for different regional power grid frequencies

Rated 1-minute power frequency withstand voltage (phase to ground/fracture) 95kV insulation performance indicators

Lightning impulse withstand voltage (peak, phase to ground/fracture) 185kV lightning overvoltage resistance capability

Rated current 1250A Maximum allowable current for long-term operation

Rated short-circuit breaking current 31.5kA, breaking capacity during short-circuit fault

Rated short-time withstand current 31.5kA, ability to withstand current during short circuit

Rated short-circuit duration of 4s, duration of short-time withstand current

Rated short-circuit closing current (peak) 82kA Closing capacity during short circuit

Rated peak withstand current 82kA, peak current withstand capability

Secondary circuit power frequency withstand voltage (1min) 2000V, insulation strength of secondary control circuit

The first trip opening time is ≤ 30ms, which is the time from the opening command to the contact separation

Rated voltage closing time ≤ 60ms Time from closing command to contact closure

Arc ignition time ≤ 15ms, the time from contact separation to arc extinguishing

Contact closing bounce time ≤ 3ms. Repeated contact time of the contact during closing

Three phase contact opening asynchrony ≤ 2ms time difference for three-phase contact opening

Mechanical lifespan: The total lifespan of 30000 mechanical operations