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VS1-7.2
VS1-7.2 Vacuum Circuit Breaker
The 7.2KV VS1 circuit breaker is an indoor AC high-voltage vacuum circuit breaker designed for high voltage distribution network edge scenarios and large industrial heavy load requirements. It is suitable for three-phase 50Hz power frequency AC circuits, with a rated voltage of 7.2KV. Its core applications include high voltage distribution network control and protection for large industrial heavy load equipment, high voltage distribution network edge branches, large mining main distribution networks, new energy power station (photovoltaic, wind power) collection stations, and large metallurgical and chemical enterprises. This product adopts high-end vacuum arc extinguishing technology and reinforced operating mechanism. The mechanism is integrated with the circuit breaker, with a sturdy structure and moderate volume. It supports two installation forms: fixed and withdrawable handcart, and is suitable for installation in large high-voltage switchgear. The product is manufactured strictly in accordance with standards such as GB1984, DL/T403, and IEC60056.
The arc extinguishing chamber is made of high-quality copper chromium contact material and cup-shaped longitudinal magnetic field contact structure, with high vacuum degree, strong breaking ability, no harmful gas emissions, and no noise pollution. It can effectively cope with high current and high load conditions at the edge of high-voltage distribution network and large industrial heavy load scenarios, quickly cut off fault currents such as overload and short circuit, and ensure the safe and stable operation of high-voltage distribution network and large heavy load equipment. It is suitable for working environments with altitude ≤ 4500m (non-standard review required) and ambient temperature -35 ℃~45 ℃. It is the core protection and control equipment for high-voltage distribution network edge and large industrial heavy load scenarios, and can adapt to special scenarios such as high altitude, high temperature, and high humidity.
Features
1. Strong breaking capacity, suitable for heavy load conditions:
The core optimization of the arc extinguishing chamber structure and contact material adopts a large capacity cup-shaped longitudinal magnetic field arc extinguishing chamber. The copper chromium contact is resistant to erosion and has excellent conductivity. The rated short-circuit breaking current can reach 31.5-50kA, far exceeding the medium voltage level VS1 circuit breaker. It can reliably break the impact current and short-circuit fault current during the start-up of large heavy load equipment, with small cut-off value and fast insulation recovery speed after arc extinguishing. It can ideally meet the requirements of inductive, capacitive and heavy load, and is suitable for the high current working conditions of heavy load equipment and high-voltage distribution network edges in large metallurgical and chemical enterprises.
2. Excellent insulation performance, suitable for complex environments:
The epoxy resin APG process is used to cast the insulation cylinder as a whole, with sufficient anti creepage distance and high insulation strength. The rated short-time power frequency withstand voltage (1 minute) can reach 50kV (relative to ground, phase to phase), 57kV (fracture), and the rated lightning impulse withstand voltage (peak) can reach 95kV (relative to ground, phase to phase), 105kV (fracture), which can stably withstand 7.2KV high voltage load and eliminate hidden dangers such as insulation breakdown and creepage; Simultaneously optimizing the sealing structure, it has outstanding moisture-proof, dust-proof, and anti pollution performance, and can adapt to special working conditions such as high altitude, high temperature, high humidity, and severe pollution. Its operational stability far exceeds that of similar products under medium pressure.
3. Structural strengthening and longer service life:
Adopting a reinforced spring energy storage operating mechanism, the components undergo high-temperature quenching and anti-corrosion treatment, with high mechanical strength and excellent anti vibration performance. The mechanical service life can reach 30000 times, and the full capacity short-circuit current breaking times can reach 50-100 times. The electrical service life meets E3 level and can adapt to the frequent operation and high load operation needs of large industrial heavy-duty scenarios for a long time, reducing equipment replacement frequency and lowering the full life cycle operation and maintenance costs, adapting to the strict requirements of continuous production in large enterprises.
4. Intelligent integration for more efficient operation and maintenance:
Standardized intelligent control interfaces are reserved, which can seamlessly connect intelligent monitoring units with distribution network automation systems, achieving remote opening and closing, real-time monitoring of operating status (current, voltage, temperature, energy storage status, arc extinguishing chamber vacuum degree), fault self diagnosis, and remote fault location functions; Supporting linkage with infrared temperature measurement and online monitoring equipment, it can provide early warning of equipment abnormalities, avoid the expansion of faults, adapt to the intelligent and unmanned operation and maintenance needs of high-voltage distribution networks, greatly improve operation and maintenance efficiency, and reduce operation and maintenance labor costs.
5. Flexible installation and wide adaptability:
It supports two installation forms: fixed and withdrawable handcart, and can be adapted to various specifications of large high-voltage switchgear such as central cabinets, fixed cabinets, double-layer cabinets, etc. It can also be installed separately on the frame for use; The handcart model adopts a high-precision guide rail design, with smooth insertion and removal, and can be powered out for maintenance, reducing the range of power outages and downtime. It is suitable for scenarios such as large substations and new energy gathering stations that require high power supply continuity; At the same time, the electrical components adopt modular design, with strong interchangeability and convenient replacement of accessories in the later stage.
The rated current of this product covers 1600A~4000A, and different specifications such as 2000A, 3150A, 4000A can be customized according to scene requirements. The rated short-circuit breaking current is 31.5~50kA, the rated short-circuit duration is 4s, the closing time is 35~75ms, the opening time is 20~50ms, the closing bounce time is ≤ 2ms, the opening and closing asynchrony is ≤ 2ms, and the contact resistance is ≤ 120 μ Ω, meeting the high load and high current requirements of large heavy-duty equipment and high-voltage distribution network edges.
The suitable environmental conditions are: the daily average relative humidity does not exceed 95%, the monthly average does not exceed 90%, the earthquake intensity does not exceed 8 degrees, and there are no places with severe vibration, strong chemical corrosion, explosion hazards, or serious pollution; High altitude scenarios (>2500m) can pass non-standard evaluations and customize reinforced insulation solutions. For high temperature, high humidity, and high pollution scenarios, anti-corrosion coatings, reinforced sealing, and dust-proof structures can be installed to further enhance equipment adaptability.
The product meets the KEMA type test A-level certification standard and has passed strict type tests, factory inspections, and weather resistance tests. Each product comes with a complete inspection report, certificate of conformity, and technical parameter manual; Support customized manual/electric operation mode, intelligent monitoring function, and special protection scheme. It can be used with supporting products such as fuse handcart, isolation handcart, voltage transformer handcart, etc. It has strong universality and is interchangeable with similar components of VS1 circuit breakers of the same voltage level in China, with timely supply of accessories.
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Specification
| Item | Unit | Data | ||||
| Rated voltage | kV | 7.2 | ||||
| Rated frequency | Hz | 50 | ||||
| Rated insulation level | 1-minute power frequency withstand voltage (effective value) | kV | 23 | |||
| Lightning impulse withstand voltage (peak value) | kV | 46 | ||||
| Rated current | A | 630 | 630 | 1250 | 1600 | |
| 1250 | 1250 | 1600 | 2000 | |||
| 2000 | 2500 | |||||
| 2500 | 3150 | |||||
| 4000 | ||||||
| Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | 40 | |
| Rated short-time withstand current | 20 | 25 | 31.5 | 40 | ||
| Rated short-circuit closing current | 50 | 63 | 80 | 100 | ||
| Rated peak withstand current | 50 | 63 | 80 | 100 | ||
| Rated short-circuit duration | S | 4 | ||||
| Rated operating sequence | O – 0.3s – CO – 180s – CO | |||||
| Split 180s Split 180s Split (40kA) | ||||||
| Rated short-circuit current breaking times | 30/20 | |||||
| Mechanical lifespan | 10000 | |||||
| Rated breaking current of a single capacitor bank | 630 | |||||
| Rated back-to-back capacitor bank breaking current | 400 | |||||
| Grounding fault breaking current of different phases | kA | 10 | ||||
| Allowable wear and accumulated thickness of dynamic and static contacts | 3 | |||||
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FAQs
What are the core differences between 7.2KV VS1 circuit breaker and 6.6KV VS1 circuit breaker, and can they be used interchangeably?
The core differences lie in the rated voltage, breaking capacity, and scene positioning, which are not interchangeable. The difference in rated voltage between the two is significant (7.2KV vs 6.6KV), with the 7.2KV model having a higher insulation level and arc extinguishing chamber capacity. The rated breaking current (31.5-50kA) far exceeds that of the 6.6KV model (25-40kA), with a focus on large-scale industrial heavy-duty and high-voltage distribution network edge scenarios; The 6.6KV model focuses on special medium voltage, foreign-related, and mining auxiliary scenarios, and its breaking capacity and insulation level are suitable for 6.6KV voltage loads. Forcefully swapping can lead to arc extinguishing failure, equipment burnout, and even safety accidents. It is necessary to strictly select the corresponding model according to the actual rated voltage of the circuit.
Can this product be used for high-voltage distribution networks in high-altitude areas (such as over 3000m)?
Sure. This product is designed to adapt to high-altitude scenarios with an altitude of ≤ 2500m by default. For high-altitude scenarios above 3000m, it can pass non-standard evaluations and customize a reinforced insulation solution – optimizing the thickness of the insulation cylinder, increasing the anti creepage distance, and strengthening the sealing of electrical components to avoid insulation performance degradation and arc extinguishing difficulties caused by high altitude and low pressure. It fully meets the operational requirements of high-voltage distribution networks in high-altitude areas and has been widely used in new energy power stations, mining distribution networks, and other scenarios in high-altitude areas.
Can the circuit breaker reliably handle the large surge current when starting large heavy-duty equipment?
Sure. This product is designed specifically for heavy-duty scenarios, using a large capacity arc extinguishing chamber and corrosion-resistant contact materials. The rated short-circuit breaking current can reach 31.5-50kA, and it can easily withstand the impact current when starting large heavy-duty equipment such as large fans, compressors, and metallurgical furnaces; At the same time, it is equipped with high-precision overload protection device, which can accurately distinguish between surge current and fault current, avoid false tripping, ensure the normal start-up of equipment, and quickly disconnect in case of short circuit fault, protecting the safety of equipment and distribution network.
Which parts need to be focused on for daily maintenance, and is it difficult to maintain?
Daily maintenance is relatively easy, with a focus on three points: ① Operating mechanism: Clean and lubricate every 6 months, check the energy storage status and mechanical transmission components to avoid jamming; ② Arc extinguishing chamber and insulation components: Regularly observe the appearance of the arc extinguishing chamber, check whether the insulation cylinder has any damage or crawling marks, and conduct insulation performance testing once a year; ③ Wiring terminals and monitoring units: Check the tightness of the terminals to avoid local overheating caused by poor contact, and regularly calibrate the intelligent monitoring data. The fixed sealed pole type can achieve maintenance free operation, only requiring regular inspection of the running status indicator lights, suitable for the efficient operation and maintenance needs of large enterprises.
Can unmanned operation and maintenance be achieved after intelligent upgrade?
Sure. After upgrading the intelligent control unit and integrating it with the distribution network automation system, the entire process of unmanned operation and maintenance can be achieved: real-time monitoring of equipment operating parameters (current, voltage, temperature, etc.), automatic sending of fault alarm signals in case of overload, short circuit, contact overheating, vacuum degree drop in the arc extinguishing chamber, and accurate feedback of fault location and type; Support remote opening and closing, fault reset, preset linkage protection logic, and achieve automatic fault handling; At the same time, operation and maintenance reports can be generated, and staff do not need to be on site. They can remotely grasp the equipment operation status and arrange operation and maintenance plans, greatly improving operation and maintenance efficiency and adapting to unmanned scenarios such as new energy gathering stations and large substations.
Related Applications
Large industrial heavy-duty equipment distribution network: mainly used for the distribution and protection of heavy-duty equipment in large enterprises such as metallurgy, chemical industry, and building materials. It can withstand the impact current during equipment start-up, quickly cut off short circuits and overload faults, avoid equipment damage and production interruption, ensure continuous and efficient production of enterprises, and adapt to the high-temperature and high load working environment of industrial workshops.
High voltage distribution network edge branch protection: Used for edge branch line protection of high-voltage distribution networks (110KV/35KV), such as urban suburban distribution networks, rural high-voltage distribution network backbone branches, and industrial park high-voltage branches. It is responsible for cutting off high current faults in branch lines, avoiding the spread of faults to the high-voltage backbone network, ensuring the safe and stable operation of high-voltage distribution networks, and adapting to the complex environment of high-voltage distribution network edge scenes. It can achieve intelligent operation and maintenance, reduce manual duty workload.
Large scale mine backbone distribution network: used for the backbone distribution network system of large mines such as coal mines and metal mines, such as the control and protection of ground backbone distribution and underground deep backbone power supply lines. The product has been designed with anti vibration and dust-proof reinforcement, and can adapt to the harsh working conditions of mines. The rated voltage is 7.2KV and the breaking current is 31.5-50kA, which is suitable for the high load requirements of the mine backbone distribution network. It can control the power supply of key equipment such as the mine main ventilation fan and main drainage pump, ensuring the safety of mine production.
New energy power station collection station distribution network: adapted to the collection station distribution system of large photovoltaic power stations and wind power stations, responsible for the collection and transmission control of photovoltaic panels and wind turbine output, able to adapt to the intermittent and fluctuating load characteristics of new energy power generation, with excellent disconnection performance and intelligent control capabilities, can be linked with the new energy control system to achieve stable power transmission and rapid fault handling, while supporting intelligent monitoring, real-time grasp of power generation and distribution status, and adapting to the unmanned operation and maintenance needs of new energy power stations.
Large substation outgoing circuit: Used for 7.2KV outgoing circuit of 110KV/35KV large substations, responsible for power transmission control and protection between substations, high-voltage distribution networks, and large industrial enterprises, realizing circuit opening and closing, overload and short circuit protection, and reclosing operations, ensuring the safety and reliability of power transmission; It can be paired with intelligent control systems to achieve automated operation and maintenance of substations, improve operation and maintenance efficiency and power supply continuity, and is one of the core supporting equipment for large substations.
