શેનહાઈ વિસ્ફોટ-પ્રૂફ
સલામતી વિદ્યુત સાધનોમાં વધારો, "e" ચિહ્ન દ્વારા સૂચિત,જ્વલનશીલ વાયુઓ સાથે ઔદ્યોગિક સેટિંગ્સમાં વ્યાપકપણે ઉપયોગમાં લેવાતા વિસ્ફોટ-પ્રૂફ ઇલેક્ટ્રિકલ સાધનોનો વિશિષ્ટ પ્રકાર છે. આ ઉપકરણો વિસ્ફોટ-પ્રૂફ સિદ્ધાંતો અનુસાર ડિઝાઇન કરવામાં આવ્યા છે, જ્યાં વિદ્યુત પુરવઠાનું રેટ કરેલ વોલ્ટેજ 11kV થી વધુ નથી (એસી આરએમએસ અથવા ડીસી). They are made to operate without generating sparks, ચાપ, 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, ચાપ, or dangerous temperatures in normal or approved abnormal conditions, and operates within the rated voltage limit of 11kV, can be designed and manufactured as વધેલી સલામતી વિદ્યુત ઉપકરણો. સ્પષ્ટપણે, equipment that fails to meet these conditions cannot be made in this style.
Instead of using an “explosion-proof enclosure” like ફ્લેમપ્રૂફ ઇલેક્ટ્રિકલ સાધનો, increased safety devices employ mechanical and/or electrical reinforcement on the various components. Based on the necessary and sufficient conditions for દહન અને વિસ્ફોટ, 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 જ્વલનશીલ વાતાવરણ.
Application and Safety Measures
સલામતી વિદ્યુત સાધનોમાં વધારો, typically used in categories like AC motors (including rotating motors, ટ્રાન્સફોર્મર્સ, electromagnets), લાઇટિંગ (including inductive ballasts for lighting), resistance heaters, batteries, જંકશન બોક્સ, current transformers for instruments and non-instrumentation purposes, is designed considering mechanical structure, enclosure protection, વિદ્યુત ઇન્સ્યુલેશન, wiring connections, વિદ્યુત મંજૂરીઓ, ક્રીપેજ અંતર, 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.
મહત્વપૂર્ણ વિચારણાઓ
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.
સામાન્ય રીતે, this explosion-proof style does not differentiate between explosion-proof levels. જો જરૂરી હોય તો, 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), કાસ્ટ આયર્ન, cast aluminum, અને એન્જિનિયરિંગ પ્લાસ્ટિક.