VB5-40.5 Indoor high voltage AC vacuum circuit breaker is suitable for indoor switch systems with air insulation. As long as it is within the normal operating conditions and the technical parameters of the circuit breaker, the VB5-40.5 vacuum circuit breaker can satisfy the power grid in normal or accidental state Under various operations, including switching and breaking short-circuit current.
It has extremely good performance in occasions that require frequent operation and or need to break short-circuit current. VB5-40.5 vacuum circuit breaker fully meets the requirements of automatic reclosing and has extremely high operational reliability and service life.
|2||Rated insulation level||1min Power frequency withstand voltage (effective value)||kV||95|
|Lightning impact withstand voltage (peak)||kV||185|
|5||Rated short circuit breaking current||kA||25,31.5|
|6||Rated short-time withstand current( 4s)||kA||25,31.5|
|7||Rated peak withstand current||kA||63,80|
|8||Rated short-circuit making current||kA||63,80|
|9||Rated breaking current of capacitor bank||A||630(single)|
|10||Rated operation order|| ||O - 0.3s - CO - 180s - CO|
|11||Breaking times under rated short-circuit current||times||50|
|12||Secondary circuit (1 min) power frequency withstand voltage||V||2000|
|13||Main circuit resistance(without plum blossom contact)||μΩ||≤55(630A)≤50(1250A)≤45(2500A)|
Product Structure and Working Principle
1. Electrical Structure
The electrical main circuit part of VB5 (ZN21B) adopts advanced epoxy resin casting technology, and the vacuum interrupter is directly sealed in epoxy resin, and there is a silicone rubber buffer layer between the two, which becomes a casting type circuit breaker pole. column. This process makes the conductive circuit not affected by the external environment (such as dust, moisture), and greatly improves the insulation level of the vacuum interrupter, reduces the insulation distance between the vacuum circuit breakers, and reduces the volume of the vacuum circuit breaker. Be maintenance-free. The cylindrical poles are arranged vertically and horizontally, the electric field distribution is excellent and the dust is not easy to gather. The upper and lower outlet arms are the intermediate links between the circuit breaker and the external primary circuit, and also play a role in transmitting and dissipating the internal heat of the circuit breaker. The vacuum interrupter is the heart of the circuit breaker, and the primary circuit is disconnected and connected. All are done in this part. The movable conductive part of the arc extinguishing chamber is connected with the lower outlet arm through a soft connection. The function of the circuit breaker is that the operating mechanism transmits the kinetic energy to the movable conductive rod by driving the insulating transmission member.
Schematic diagram of solid-sealed pole structure
2. Working principle of vacuum interrupter VB5 Vacuum Circuit Breakers use specially designed contacts to close and separate in a highly vacuum arc extinguishing chamber to achieve the purpose of closing and breaking the line current. Due to the high degree of vacuum with extremely high insulation strength, in the opening position, only a small contact distance can meet the insulation requirements. When the circuit breaker receives the closing signal under the action of the operating mechanism, the moving contact The head moves upward and contacts the static contact, completing the closing process. When the circuit of the ASHARE good quality circuit breaker is energized, when the opening signal is received, under the action of the operating mechanism, the moving contact moves downwards and leaves the static contact. The moving and static contacts separate instantly and an arc is generated. At the same time, the arc current flowing through the special structure of the contact produces a longitudinal magnetic field, which interacts with the arc, and the charged particles are rotated and diffused by the Lorentz force and move at high speed along the arc. Therefore, the burning damage to the contact surface by the arc is not concentrated in a small range, and the burning damage on the contact surface is lighter and uniform. When the arc current naturally crosses zero for the first time, it is extinguished. The residual ions, electrons and metal vapor can recombine or condense on the contact surface and the shield in a fraction of a millisecond. Therefore, the vacuum medium After the arc, the insulation strength recovers extremely quickly. Under a certain contact distance, the AC arc is extinguished to achieve the purpose of breaking the current.Cross-section drawn of vacuum fire extinguishing chamber3. Introduction of CRR1000 operating mechanism transmission
As shown in below chart: The box is used as a shell to install and support various parts of the operating mechanism. The energy storage system consists of an energy storage motor with a transmission (items 4, 28), a secondary chain drive (item 29), a triangle arm (item 3), a traction chain (item 2), a guide sprocket (item 37), The closing spring (item 1), limit switch S1 (item 21), drive arm (item 26), energy storage shaft and clutch arm (item 20) are composed.
The cam transmission system consists of a cam (item 9), a transmission plate (item 11), a roller (item 10), an ejector rod (item 13), a main shaft (item 14), a contact pressure spring (item 18), and a main arm (item 18) Item 15), opening spring (item 17), and oil buffer (item 23). The closing and opening holding and releasing devices are each composed of a secondary holding crank arm (item 6, item 27, item 30, and item 31), a small crank arm (item 12) and a closing and opening operating handle.
The secondary control system consists of auxiliary switch QF (item 19), limit switch S1 (item 21), closing and opening coils HQ, TQ (item 8, item 22).
Schematic diagram of mechanical transmission
Q: Are you the manufacturer or trader?
A: We are both manufacturer & trader. We have our own manufacturer named TIANYI TONGYI ELECTRIC CO.,LTD, who have 27 years experience in electric industry. It covers an totally area of 117,000 m2 with 300 employees, also is a qualified supplier of China National Nuclear Corporation(CNNC) and main supplier for State Grid & China Southern Power Grid.
Q: What is your after-sales service?
A: We always provide free online service and technical support within 24 hours. 18 months warranty for customers.
Q: What is your delivery time?
A: Normally 25~35days. It depends on the order quantity and season. We have very strong capacity to produce top quality products, please inquiry us if you have any questions.
Q: What is the quality warranty time?
A: We have quality certificate CCC, CQC, ISO9001, CE ... Meanwhile, we can provide 18 months warranty for our products. Free online service and technical support within 24 hours is always provided to our customers.
Q: Do you accept ODM and OEM?
A: Yes. We have professional R & D teams to update and develop the latest technology. We also can support ODM or OEM, please send us details drawing to discuss.
Q: What is your payment terms?
A: Generally there are two payment terms:
1. 30% advance payment via T/T as a deposit, balance 70% against the shipping documents
2. Irrevocable L/C at sight
Q: If I want to visit you, how to go?
A: Our factory is located in Luoyuan County, Fuzhou City. Details address is Songshan Area, Taiwan Investment Zone, Luoyuan County, Fuzhou City, Fujian Province,China.
- The nearest airport is Fuzhou Airport, if you come by air, please arrive in Fuzhou Airport, it takes 1 hour from the airport to our factory
- The nearest train station is Luoyuan Station, if you come by train, please arrive in Luoyuan Station, it takes only 5 minutes to our factory.
Anyway, please contact us in advance, we will send the car to the airport or train station to pick you up.Sincerely welcome you to come and visit us.
Q: Do you need agents?
A: Yes, we welcome you to be a partner. Welcome to contact us for more information.