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The equipment is designed to operate reliably under the following environmental conditions:
Altitude: Not exceeding 2,000 meters above sea level.
Ambient Temperature: Maximum +40°C, minimum –25°C.
Outdoor Wind Speed: Shall not exceed 35 m/s.
Pollution Grade: Class II (moderate pollution environment, suitable for most industrial and urban areas).
Seismic Resistance:
Horizontal acceleration: ≤ 3 m/s²
Vertical acceleration: ≤ 1.5 m/s²
Safety factor: > 1.67
These parameters ensure stable performance under typical outdoor distribution conditions, including moderate seismic activity and standard wind loads.
To achieve the high-performance CSP (Completely Self-Protected) transformer, we have integrated several key protection and monitoring components into the transformer design. These components work together during the manufacturing process to provide multiple layers of electrical and thermal protection, ensuring long-term operational safety and reliability without requiring extensive external protection devices.
The CSP technology integrates:
Overcurrent protection (high-voltage fuse)
Overload indication (visual signal light)
Secondary fault protection (low-voltage circuit breaker)
These components are internally mounted and electrically coordinated to provide comprehensive protection for both the transformer and the downstream network.
The high-voltage fuse serves as the primary overcurrent protection device for the transformer. Its main function is to automatically isolate a faulty transformer from the main power network in the event of an internal fault, such as a short circuit or severe overload.
Mounting Location: Inside the transformer tank.
Electrical Connection: Connected between:
The incoming high-voltage lead from the bushing, and
The high-voltage line lead from the transformer primary winding.
This internal mounting ensures that the fuse operates in a controlled environment, protected from external contamination and weather conditions. When the fuse operates (blows), it safely interrupts the fault current and disconnects the transformer from the network, preventing damage to upstream equipment and reducing outage impact on other customers.
The overload indicator provides a clear visual indication when the transformer is operating under abnormal loading conditions (e.g., sustained overload beyond rated capacity).
Mounting Location: The indicator light is mounted on the exterior wall of the transformer tank, near the operating handle of the circuit breaker for easy visibility.
Electrical Connection: The signal light is electrically connected to the internal signal light sensing circuit inside the transformer, which continuously monitors load current.
When the load current exceeds the preset threshold for a specified period, the sensing circuit activates the external indicator light. This allows field personnel to quickly identify overloaded transformers without opening the tank or performing complex measurements, enabling timely load management or maintenance actions.
The low-voltage (secondary) circuit breaker provides secondary-side fault and overload protection, protecting the low-voltage circuit and downstream equipment from damage caused by excessive current.
Mounting Location: Inside the transformer tank.
Electrical Connection: Connected between:
The secondary winding (low-voltage side of the transformer), and
The secondary bushing (which connects to the external low-voltage cable or load).
This internal connection ensures that all current flowing out of the secondary winding passes through the circuit breaker. In the event of a secondary-side fault (such as a short circuit or sustained overload), the circuit breaker trips, disconnecting the load from the transformer. This protects both the transformer and the downstream equipment from thermal and mechanical stress.
The secondary circuit breaker can be manually reset after the fault is cleared, providing both protection and operational convenience.
