Shenhai Explosion-proof
Amûrên elektrîkê yên ewlehiyê zêde kirin, bi nîşana “e,” celebek pispor a alavên elektrîkê yên teqemenî ye ku bi berfirehî di mîhengên pîşesaziyê de bi gazên şewitandî têne bikar anîn. Ev alavan li gorî prensîbên teqîna teqandinê hatine çêkirin, ku voltaja binavkirî ya dabînkirina elektrîkê ji 11 kV derbas nabe (AC rms an DC). They are made to operate without generating sparks, arcs, or hazardous temperatures under normal or certain abnormal conditions.
Explosion-Proof Principle
According to the principle of explosion-proof design, electrical equipment that does not produce sparks, arcs, or dangerous temperatures in normal or approved abnormal conditions, and operates within the rated voltage limit of 11kV, can be designed and manufactured as ewlehiya zêde alavên elektrîkê. Bi zelalî, equipment that fails to meet these conditions cannot be made in this style.
Instead of using an “explosion-proof enclosure” like flameproof alavên elektrîkê, increased safety devices employ mechanical and/or electrical reinforcement on the various components. Based on the necessary and sufficient conditions for şewitandinê û teqîn, these measures enhance the safety and reliability of the devices. This approach involves specific structural measures and safety requirements to ensure that the electrical equipment does not become an ignition source in şewatbar derdorên.
Application and Safety Measures
Amûrên elektrîkê yên ewlehiyê zêde kirin, typically used in categories like AC motors (including rotating motors, Veguheztinên, electromagnets), ronahîkirin (including inductive ballasts for lighting), resistance heaters, batteries, qutiyên girêdanê, current transformers for instruments and non-instrumentation purposes, is designed considering mechanical structure, enclosure protection, insulasyona elektrîkê, wiring connections, paqijiyên elektrîkê, dûrahiyan diherike, and limiting temperature rise.
For manufacturing other electrical devices in this style, additional technical measures and safety requirements are considered beyond the general requirements of increased safety design.
Nîqaşên Girîng
1. Under installation conditions, the operational parameters of electrical components should not exceed 2/3 of their rated nominal parameters.
2. Heating elements should not produce hazardous temperatures beyond the limit or adversely affect surrounding circuit units.
3. Resistive elements should be thin-film or wire-wound resistors.
4. Inductive components should prevent the generation of back EMF upon circuit interruption.
5. Capacitive elements should be solid insulating medium capacitors, avoiding electrolytic or tantalum capacitors.
6. Switch components should be protected with flameproof enclosures.
Giştîve, this explosion-proof style does not differentiate between explosion-proof levels. Ger hewce be, specific levels like IIA, IIB, or IIC can be determined through testing for high-voltage or high-capacity increased safety AC motors. The device protection levels, like level b or c, are also considered in practical use, represented as Gh or Gc levels.
The enclosures of increased safety electrical equipment are usually made of metal plates (such as certain steel and aluminum alloys), hesinê helandî, cast aluminum, û plastîkên endezyariyê.