Shenhai Ho phatloha-Bopaki
Ho eketsa lisebelisoa tsa motlakase tsa polokeho, e hlalosoang ka letšoao “e,” ke mofuta o ikhethileng oa lisebelisoa tsa motlakase tse sa phatloheng tse sebelisoang haholo liindastering tse nang le likhase tse tukang. Lisebelisoa tsena li entsoe ho latela melao-motheo e thibelang ho phatloha, moo matla a lekantsoeng a phepelo ea motlakase a sa feteng 11kV (AC rms kapa 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 tshireletso e eketsehileng lisebelisoa tsa motlakase. Ho hlakile, equipment that fails to meet these conditions cannot be made in this style.
Instead of using an “explosion-proof enclosure” like e thibelang mollo lisebelisoa tsa motlakase, increased safety devices employ mechanical and/or electrical reinforcement on the various components. Based on the necessary and sufficient conditions for ho tuka le ho phatloha, 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 e ka chang tikoloho.
Application and Safety Measures
Ho eketsa lisebelisoa tsa motlakase tsa polokeho, typically used in categories like AC motors (including rotating motors, li-transformer, electromagnets), kgantsha (including inductive ballasts for lighting), resistance heaters, batteries, mabokose a mateano, current transformers for instruments and non-instrumentation purposes, is designed considering mechanical structure, enclosure protection, ho kenya letsoho motlakase, wiring connections, ho tlosoa ha motlakase, sebaka sa creepage, 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.
Lintlha tsa Bohlokoa
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.
Ka kakaretso, this explosion-proof style does not differentiate between explosion-proof levels. Haeba ho hlokahala, 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), tšepe ea tšepe, cast aluminum, le lipolasetiki tsa boenjiniere.