Below are specific manifestations of their high reliability and an analysis of the underlying reasons:
1. Core Technical Advantages
1) Ideal Arc-Extinguishing Medium-Vacuum
High Insulation Strength: Vacuum's insulation strength far exceeds that of air and SF₆ gas, facilitating easier arc extinction.
No Medium Degradation: Vacuum medium does not age, decompose, or produce harmful substances, maintaining permanent performance.
No Reignition or Re-Breakdown: After arc extinction at current zero crossing, vacuum medium strength recovers extremely rapidly, making re-breakdown highly unlikely.
2) Fully Sealed Arc-Extinguishing Chamber Structure
The core component-the vacuum arc-extinguishing tube-features a ceramic or glass housing sealed once during initial assembly for lifelong integrity. Internal parts resist oxidation. Metal vapor from evaporated contact materials condenses on shielding covers without compromising insulation, achieving "maintenance-free" operation.
3) Advanced Contact Materials
Special alloy materials (e.g., copper-chromium CuCr) are employed, offering:
Low current-carrying capacity: Suppresses operating overvoltages.
High breaking capacity: Resists arc erosion.
Low volatility: Extends service life.
2. Simple Operating Mechanism
Typically equipped with a spring-storage operating mechanism featuring simple structure and mature technology. Fewer components ensure high reliability and low failure rates.
3. Potential Failure Points and Considerations
Despite exceptional reliability, vacuum circuit breakers are not flawless. Key potential failure points include:
1) Operating Mechanism (Primary Failure Point)
As the sole moving component, mechanical parts like springs, linkages, and trip coils may fail due to fatigue, sticking, or inadequate lubrication. The vast majority of VCB failures originate here, not within the arc-extinguishing chamber itself.
2) Secondary Components and Auxiliary Circuits
The reliability of control elements like microswitches, relays, and terminals impacts overall operation.
3) Vacuum Decline (Extremely Rare)
Manufacturing defects or external mechanical impacts may cause arc chamber seal failure and vacuum loss. Modern manufacturing techniques have made this probability negligible, and real-time monitoring via online vacuum level devices is available.
4.Do you know how to Ensure and Further Enhance Reliability?
1)Condition-Based Maintenance Replaces Scheduled Maintenance: Utilizing online monitoring technologies (e.g., mechanical characteristic monitoring, vacuum level monitoring) shifts from "scheduled maintenance" to "on-demand maintenance," representing the current mainstream approach.
2) Conduct Regular Routine Inspections: Such as checking mechanism lubrication, fastener tightness, and auxiliary switch status.
Vacuum circuit breakers represent an exceptionally reliable electrical device. Their core advantage lies in employing permanently sealed vacuum arc extinguishing chambers with non-degrading performance, achieving high breaking capacity, extended service life, and true maintenance-free operation. Their reliability has been validated for decades across the global power industry, establishing them as the absolute mainstream and technological benchmark in the medium-voltage sector. Users need only focus on maintaining the external operating mechanism to ensure long-term stable operation.
The new generation ZN85-40.5 vacuum circuit breaker is produced by Shaanxi West Power Tongzhong Electrical Co., Ltd.is an upgrade product based on the 35kV vacuum circuit breaker with the 3AV3 mechanism as the main body. It has been fully optimized and upgraded in terms of mechanical transmission, mechanism body, secondary circuit, and other aspects. This product is an indoor switchgear with a rated voltage of 40.5kV and AC 50Hz.
ZN85-40.5 vacuum circuit breaker has many advantages:
1.Performance of the circuit breaker
E2-C2-M2
2.Convenient maintenance
The modular mechanism design allows for easy replacement of the closing and opening coils without the need for dismantling other components. This eliminates the need for testing or adjustment after replacement, ensuring users to replace them independently, making subsequent maintenance more convenient.
3.
High conductivity performance
It adopts optimized insulated cylinder structure and embedded pole with high performance flexible connections, reducing contact resistance to ensure reliable power supply.
4.
Wide range of applications
Designed to withstand harsh environments, the product can endure temperatures as low as -25°C and meets usage requirements up to an altitude of 2000 meters.
For more product information ,pls contact us at any time .
Shaanxi West Power Tongzhong Electrical Co., Ltd.
Contact: Ms.Grace Liu (Director of Sales Department)
Tel: +86 917 3661109 Fax: +86 917 6739416
Email:xdtz04@westpowerelectrical.com
Mobile: +86 18091765882(WhatsApp/Wechat/skype )
Website:https://www.xdtzelectrical.com
Add: Nanpo Village, Chencang Avenue Jintai District Baoji City, Shaanxi Province, China.
