در این پست از سایت آموزش تابلو برق و تاسیسات الکتریکی تجهیزات و استاندارد های لازم برای تابلو های برق در نظر گرفته شده است که به صورت فایل انگلیسی بوده و می توانید در ادامه آنرا دانلود کنید.
MATERIAL AND EQUIPMENT STANDARD FOR SWITCHGEAR
INTRODUCTION
This Standard may not cover every requirement or diversity of conditions at each locality; but this is recognized and the
write up is sufficiently, flexible to allow individual companies in oil, gas, and petrochemical industries of Iran to exercise
their own judgment in these situations, with due consideration to the existing electrical installations of oil, gas and
petrochemical industries in Iran and the pertinent prevailing hazards.
It is necessary to mention also that this standard is written mainly for the purchase of switchgear and controlgear assemblies
to be installed in non hazardous atmospheres, and their installation shall be avoided in hazardous locations, however
if requirement dictates such application; in addition to requirements of this Standard specification, the assembly
shall be designed specially for the petroleum, gas and petrochemical industries, suitable for the climatic conditions
specified in this Standard Specification and in compliance with the requirements of standards for electrical apparatus in
explosive atmospheres to which reference is made in Appendix G.
This Standard is prepared in two parts:
part I : Deals with the Low Voltage (LV) 400/230 volt, 3 phase, 4 wire, a.c. 50 Hz industrial switchgear and
controlgear.
Part II : Deals with the Medium Voltage (MV) 3.3 kV to 66 kV, 3 phase, 3 wire a.c. 50 Hz industrial switchgear.
In order to have precise and clear definitions for Low Voltage (LV), Medium Voltage (MV), and High Voltage (HV)
standards; the ISIRI No. 6 (1987) derived from the IEC standard No. 38 (1983) with some changes is quoted below:
A) – LOW VOLTAGE
Low Voltage(LV) is defined as voltages below 1000 volt in a 3 phase 4 wire 50 Hz system.
B) – MEDIUM VOLTAGE
Medium Voltage (MV) is defined as voltages higher than 1000 volt up to and including 66 kV in a 3 phase , 3 wire , 50
Hz system.
C) – HIGH VOLTAGE
High Voltage (HV) is defined as voltages higher than 66 kV in a 3 phase, 3 wire, 50 Hz system.
High voltages are mainly used for power transmission and unlikely to have application for the purpose of switchgear
and controlgear standard in this Standard Specification
مشخصات محصول رایگان
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