In high-voltage electrical equipment, if a sudden pressure rise isn’t vented in time, the risk of equipment rupture and medium leakage increases quickly. Bursting discs for power industry provide a physical response that relieves pressure in milliseconds, without relying on external power — making them the last line of defense for equipment safety.
What Are Bursting Discs for Power Industry?
Bursting discs for power industry are installed on high-value electrical equipment such as gas-insulated switchgear, SF6 current transformers, and circuit breakers. When an abnormal overpressure occurs inside, the disc’s own structure opens rapidly at a set pressure to vent the pressure and prevent the equipment housing from bursting. Unlike traditional relief valves, bursting discs have no moving parts — their activation relies entirely on material properties and precision machining.
Applications in Power Systems.
Bursting discs for power industry are widely used in high-voltage switchgear, GIS , SF6 current transformers, circuit breakers, and transformer on-load tap changers. When an arc fault or operational overpressure happens inside the equipment, pressure rises instantly — the bursting disc vents it in time, stopping the incident from escalating.
Working Principle and Explosion Prevention Mechanism.
The explosion prevention mechanism of bursting discs for power industry is based on a preset pressure. The core is a precision-machined metal membrane. When the internal pressure reaches the calibrated burst value, the membrane opens instantly along pre-scored lines — no external signal needed. Depending on the membrane design, a forward-acting dome bursts by tensile rupture, while a reverse-acting dome uses compressive instability to flip open. The whole process is purely physical and happens in milliseconds.
Selection and On-Site Installation Tips.
When choosing bursting discs for power industry, you need to consider the equipment’s operating pressure, medium type, connection size, and mounting method. The burst pressure should be higher than the maximum operating pressure but lower than the equipment’s pressure limit. For materials, choose stainless steel, copper, or aluminum depending on the medium’s corrosiveness. During installation, pay attention to the disc orientation, gasket selection, and bolt torque.
Daily Maintenance.
Bursting discs for power industry must be replaced directly after activation — they are not reusable. Regularly check the disc for corrosion, scratches, or deformation, and check the gasket for aging. For outdoor equipment, also make sure the vent opening is not blocked by debris or ice. If pressure fluctuates frequently, shorten the inspection interval. During scheduled shutdowns, record the installation date and calibrated burst pressure, and keep spare parts ready. Since bursting discs have no moving parts, they don’t need lubrication or adjustment — just keep the installation environment clean and avoid mechanical damage.
