Shenhai-Proof Shpërthimi
Rritja e sigurisë së pajisjeve elektrike, shënohet me simbolin “e,” është një lloj i specializuar i pajisjeve elektrike rezistente ndaj shpërthimit, i përdorur gjerësisht në mjediset industriale me gazra të ndezshëm. Këto pajisje janë projektuar sipas parimeve të mbrojtjes nga shpërthimi, ku tensioni nominal i furnizimit me energji elektrike nuk kalon 11 kV (AC rms ose DC). They are made to operate without generating sparks, harqe, 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, harqe, or dangerous temperatures in normal or approved abnormal conditions, and operates within the rated voltage limit of 11kV, can be designed and manufactured as siguria e rritur pajisje elektrike. qarte, equipment that fails to meet these conditions cannot be made in this style.
Instead of using an “explosion-proof enclosure” like i papërshkueshëm nga flaka pajisje elektrike, increased safety devices employ mechanical and/or electrical reinforcement on the various components. Based on the necessary and sufficient conditions for djegie dhe shpërthim, 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 të ndezshme mjedise.
Application and Safety Measures
Rritja e sigurisë së pajisjeve elektrike, typically used in categories like AC motors (including rotating motors, transformatorëve, electromagnets), ndriçimi (including inductive ballasts for lighting), resistance heaters, batteries, kuti bashkimi, current transformers for instruments and non-instrumentation purposes, is designed considering mechanical structure, enclosure protection, izolim elektrik, wiring connections, hapësirat elektrike, distancat e zvarritjes, 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.
Konsiderata të rëndësishme
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.
Në përgjithësi, this explosion-proof style does not differentiate between explosion-proof levels. Nëse është e nevojshme, 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), gize, cast aluminum, dhe plastikës inxhinierike.