| Brand | ROCKWILL |
| Model NO. | 72.5kV HV Gas circuit breaker |
| Rated voltage | 72.5kV |
| Rated normal current | 5000A |
| Rated frequency | 50Hz |
| Rated short circuit breaking current | 50kA |
| Series | LW36-72.5 |
Product introduction：
LW36-72.5 self-energy outdoor HV AC sulfur hexafluoride circuit breaker is an outdoor three-phase porcelain column electrical equipment mainly used in AC 50Hz or 60Hz, 72.5kV electricity systems in extremely cold regions (for electric stations in general regions and -42'℃ extremely cold regions). This product can be operated frequently and used as a connection circuit breaker.
Main characteristic：
High performance -strong rated circulating ability: strong short circuit breaking ability up to 5500A. 50kA.
Long service life -electrical endurance: 50kAx21times; mechanical life: 10000 times.
Reliable breaking performance.
Reliable sealing performance; Annual leakage of SF6 gas ≤0.5%.
Meeting the requirements of hard running environments -suitable for Class IV polluted environments.
Multi-structure forms-usually porcelain column type and handcart type.
Main technical parameters:
Instructions on placing orders :
Model and format of the circuit breaker.
Rated electrical parameters (voltage, current, breaking current, etc).
Working conditions for using (environment temperature, altitude, and environment pollution level).
Rated control circuit electrical parameters (Rated voltage of energy-store motor and Rated voltage of opening, closing coil).
Names and quantities of spare items needed, parts and special equipment and tools (to be otherwise ordered).
The wire connecting direction of the primary upper terminal.
How to choose the right type of circuit breaker?
System Voltage：
System Voltage: Determine the working voltage of the system and select a circuit breaker that can withstand the voltage level. High-voltage and ultra-high-voltage systems typically use SF6 gas or oil-immersed circuit breakers.
System Current：
System Current: Consider the maximum continuous current and short-circuit current of the system, and select a circuit breaker with sufficient rated current and short-circuit capacity.
Application Environment：
Outdoor Environment：
Outdoor Environment: If the circuit breaker will be installed outdoors, consider its performance in resisting pollution, moisture, and windblown sand. Tank-type circuit breakers (such as those using SF6 gas or oil) are generally more suitable for outdoor environments.
Indoor Environment：
Indoor Environment: For indoor installations, circuit breakers that are smaller in size and easier to maintain can be chosen, such as vacuum circuit breakers.
Insulating and Arc-Quenching Medium：
SF6 Gas:
SF6 Gas: Offers excellent insulating and arc-quenching performance, making it suitable for high-voltage and ultra-high-voltage systems. However, environmental concerns and leakage issues need to be addressed.
Insulating Oil:
Insulating Oil: Provides good insulating and heat dissipation properties, but poses fire risks and environmental pollution issues. It is suitable for applications where fire prevention requirements are not stringent.
Vacuum:
Vacuum: Suitable for medium and low-voltage systems, offering long life, high reliability, and ease of maintenance.
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