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China VT19-40.5 Indoor HV Vacuum Circuit Breaker - Reliable Suppliers & Factory for 35kV Power Systems
General
VT19-40.5 type indoor high voltage vacuum circuit breaker is indoor switchgear, used in three phase 50Hz/60Hz, 35kV electric power system. It is a control and protective unit, applied in electric facilities of industrial and mining enterprises, power plants and substation. Because of its special superiority, it is particularly suitable for frequent operations that require a rated working current , or for place where short-circuit current are broken multiple times.
Standards
The break circuit meets the requirements of GB1984 "HV AC circuit breaker", JB3855"HV AC vacuum circuit breaker" and relevant IEC standards. It has reliable interlocking function, and can be used as both handcart unit and fixed unit.
Type designation
Service Conditions
● Normal condition
- Ambient temperature: +40℃~-15℃
- Relative humidity: Daily average relative humidity ≤95%, Daily average vapour pressure ≤2.2x10-3 Mpa; Monthly average relative humidity ≤90%, Monthly average vapour pressure ≤1.8x10-3 Mpa.
- Altitude: ≤ 2000m (Suitable for VT19-40.5EP)
- Earthquake intensity: < grade 8
- Installation: The using place should be no water drop, no inflammable and explosion hazard, no chemical enchant gas, and no strenuous vibration.
● Special service condition
If the customer deviates from the normal conditions, it can be consulted with the manufacturer.
Technical Parameters
◆ Technical parameters of circuit breaker
| S/N | Parameter name | Unit | Data |
|---|---|---|---|
| 1 | Rated voltage | kV | 40.5 |
| 2 | Rated frequency | Hz | 50/60 |
| 3 | Rated lighting impulse withstand voltage | kV | 185 |
| 4 | Rated 1 min power frequency withstand voltage | kV | 95 |
| 5 | Rated operation sequence | - | O-0.3s-CO-180s-CO |
| Type | Rated current (A) | Rated short circuit breaking current (kA) | Rated short circuit making current (peak kA) | Rated duration of short circuit (s) | Rated breaking times of short circuit (times) | Mechanical life (times) |
|---|---|---|---|---|---|---|
| VT19-40.5 | 630 | 20/25 | 50/63 | 4 | 30 | 10000 |
| 1250 | ||||||
| 1250 | 31.5 | 80 | 4 | 20 | 10000 | |
| 1600 | ||||||
| 2000 | ||||||
| 2500 | ||||||
| 4000 |
◆ Mechanical characteristic parameters of circuit breaker
| S/N | Parameter name | Unit | Data |
|---|---|---|---|
| 40.5kV | |||
| 1 | Clearance between open contacts | mm | 18 ± 1 |
| 2 | Over-travel | 4 ± 0.5 | |
| 3 | Three phase opening and closing asynchronous | ms | ≤ 2 |
| 4 | Bounce time of closing contact | ms | ≤ 3 |
| 5 | Contact pressure of closing contact | N | 20kA, 25kA, 31.5kA |
| 2000±200, 2700±200, 3100±200 | |||
| 6 | Average opening speed | m/s | 1.8 ± 0.2 |
| 7 | Average closing speed | 0.8 ± 0.2 |
◆ Opening and closing time
| Type | Closing time (ms) | Opening time (ms) |
|---|---|---|
| 40.5kV | 30-70 | 15-50 |
Outline dimension drawing
A) Handcart type (The travel distance is about 615±2mm)
| Rated current (A) | 630 | 1250 | 1600 | 2000 2500 | 3150 |
| Rated short circuit breaking current (kA) | 20/25/31.5 | 31.5 | 31.5 | 31.5 | |
| Distance between phase (mm) | Φ35 | Φ49 | Φ55 | Φ79 | Φ109 |
Figure 1 VT19-40.5 handcart type circuit breaker outline dimension diagram (configured in medium-mounted cabinet with a width of 1400mm)
B) Fixed type
| Rated current (A) | 630 | 1250 | 1600 | 2000 2500 | 3150 |
| Rated short circuit breaking current (kA) | 20/25 | 31.5 | |||
Figure 2 VT19-40.5 fixed front mounted type circuit breaker outline dimension diagram
| Rated current (A) | 630 | 1250 | 1600 | 2000 2500 | 3150 |
| Rated short circuit breaking current (kA) | 20/25 | 31.5 | |||
Figure 3 VT19-40.5 fixed side mounted type circuit breaker outline dimension diagram
Structure
● Main structure
The circuit breaker adopts integrated structure. The design of operating mechanism and main conductive circuit are front and rear layout respectively. Operating mechanism has modular design, compact structure and stable performance. Main conductive circuit part has three choices of different types of poles: environment-friendly high strength nylon embedded pole, APG process epoxy resin sealed pole and composite insulated ordinary pole. Solid insulated and composite insulated pole both greatly reduce the accumulation of dust on the outer surface of the arc-extinguishing chamber. In particular, solid insulated pole plays a role in protecting the vacuum interrupter and anti-external arc.
● The structure of the operating mechanism
The operating mechanism is spring energy storage operating mechanism, installed under circuit breaker. The device is the inherent component of circuit breaker, provided with stored energy part, transmission part, closing and opening units of tripping part is composed with one or several tripping electromagnet auxiliary switch, indicators, etc. There are closing-opening button, manual energy-stored handle hole, closing-opening indicators of spring energy-stored condition on the front of device. This monolithic construction reduces unnecessary intermediate link, lowers energy consumption and noise, and realizes reasonable mechanical efficiency, and stability and superior strength and stiffness, so that ensure excellent, stable and reliable mechanical characteristics of circuit breaker.
Frequently Asked Questions (FAQ)
What applications is the VT19-40.5 vacuum circuit breaker designed for?
It is an indoor switchgear designed for three-phase 50Hz/60Hz, 35kV electric power systems. It acts as a control and protective unit for electrical facilities in industrial and mining enterprises, power plants, and substations. It is ideal for frequent operations requiring rated working currents or where short-circuit currents are broken multiple times.
Which standards does this circuit breaker comply with?
The VT19-40.5 circuit breaker meets the strict requirements of GB1984 ("HV AC circuit breaker"), JB3855 ("HV AC vacuum circuit breaker"), and relevant international IEC standards.
What are the normal environmental conditions for its operation?
It operates normally in ambient temperatures between +40℃ and -15℃, relative humidity up to a daily average of 95% (monthly average ≤90%), altitudes up to 2000m (for VT19-40.5EP), and earthquake intensities below grade 8. The installation location must be free of water drops, flammable/explosive hazards, chemical gases, and strenuous vibration.
What options are available for the main conductive circuit poles?
It offers three pole designs: environment-friendly high-strength nylon embedded poles, APG process epoxy resin sealed poles, and composite insulated ordinary poles. The solid and composite insulated designs minimize dust accumulation, protecting the vacuum interrupter.
What are the key advantages of the spring energy storage operating mechanism?
The operating mechanism features a monolithic, modular design placed directly under the circuit breaker. This structure eliminates unnecessary intermediate linkages, which lowers energy consumption and noise, while ensuring optimal mechanical efficiency, strength, and reliable performance.