वाढीव सुरक्षितता विद्युत उपकरणांचे स्फोट प्रूफ तत्त्व

वाढलेली सुरक्षा विद्युत उपकरणे, "e" चिन्हाने दर्शविले जाते,ज्वालाग्राही वायूंसह औद्योगिक सेटिंग्जमध्ये मोठ्या प्रमाणावर वापरले जाणारे विशेष प्रकारचे स्फोट-प्रूफ विद्युत उपकरणे आहेत. ही उपकरणे स्फोट-प्रूफ तत्त्वांनुसार डिझाइन केलेली आहेत, जेथे विद्युत पुरवठ्याचे रेट केलेले व्होल्टेज 11kV पेक्षा जास्त नाही (AC rms किंवा DC). They are made to operate without generating sparks, चाप, 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, चाप, or dangerous temperatures in normal or approved abnormal conditions, and operates within the rated voltage limit of 11kV, can be designed and manufactured as वाढलेली सुरक्षा विद्युत उपकरणे. स्पष्टपणे, equipment that fails to meet these conditions cannot be made in this style.

Instead of using an “explosion-proof enclosure” like ज्वालारोधक विद्युत उपकरणे, increased safety devices employ mechanical and/or electrical reinforcement on the various components. Based on the necessary and sufficient conditions for ज्वलन आणि स्फोट, 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 ज्वलनशील वातावरण.

Application and Safety Measures
वाढलेली सुरक्षा विद्युत उपकरणे, typically used in categories like AC motors (including rotating motors, ट्रान्सफॉर्मर, electromagnets), प्रकाशयोजना (including inductive ballasts for lighting), resistance heaters, batteries, जंक्शन बॉक्स, current transformers for instruments and non-instrumentation purposes, is designed considering mechanical structure, enclosure protection, इलेक्ट्रिकल इन्सुलेशन, wiring connections, विद्युत मंजुरी, क्रिपेज अंतर, 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.

महत्वाचे विचार

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.

साधारणपणे, this explosion-proof style does not differentiate between explosion-proof levels. आवश्यक असल्यास, 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), कास्ट लोह, cast aluminum, आणि अभियांत्रिकी प्लास्टिक.