Miscellaneous - My reference
- Transient sudden rise in voltage for a short period of time of 5 nanoseconds to 50 nanoseconds. ESD and lightning ESD are example. ESD can have 8000Volts for a billionth of a second. This time is enough to damage electronic item. solution is Transient voltage surge suppressor and ground the extra voltage.
- Spike-Surge-Swell(high voltage) / Sag(low voltage) in voltage for short period less than minute can be conditioned by UPS. State of the art ups have power factor of 1 i.e. va=w. ups that I may buy for pc may have power factor of 60% i.e. 100va will give 60watts.
- Over voltage or under voltage is high or low voltage for longer than 1 minutes. damages electrical equipment. I will not use my water pump during over or under voltage as it is directly connected without any stabilizer. My ac is getting power through stabilizer it should handle over and under voltage condition. for DC you need to have power conditioner and UPS. same is require for voltage fluctuation.
- IN dc standby power need is fulfilled by DG or by battery
- DG component starter starts the DG, alternator converts mechanical energy to AC, voltage regulator controls the voltage produced by alternator, governor determines the quality of AC output. Once the AC is stabilized it power feeding will start from DG. When two or more generators are paralleled for more output or redundancy they must be governed at the same speed. If two DG are out of sync one of them will carry larger fraction of load which needs correction that is done by governor.
- 42U 19" standard rack 1U=1.75inch ADU - Air Distribution Unit
ARU - Air removing unit,
- Never mix hot and cold aisle
- Use of blanking panel for open space in rack improves air flow
- Use thermostat normally you don't always need 22 degree Celsius 24 degree Celsius is okay in many cases
- Environment cooling can be used to reduce overall cost
- proper cabling, avoid spaghetti of cables
- Spike-Surge-Swell(high voltage) / Sag(low voltage) in voltage for short period less than minute can be conditioned by UPS. State of the art ups have power factor of 1 i.e. va=w. ups that I may buy for pc may have power factor of 60% i.e. 100va will give 60watts.
- Over voltage or under voltage is high or low voltage for longer than 1 minutes. damages electrical equipment. I will not use my water pump during over or under voltage as it is directly connected without any stabilizer. My ac is getting power through stabilizer it should handle over and under voltage condition. for DC you need to have power conditioner and UPS. same is require for voltage fluctuation.
- IN dc standby power need is fulfilled by DG or by battery
- DG component starter starts the DG, alternator converts mechanical energy to AC, voltage regulator controls the voltage produced by alternator, governor determines the quality of AC output. Once the AC is stabilized it power feeding will start from DG. When two or more generators are paralleled for more output or redundancy they must be governed at the same speed. If two DG are out of sync one of them will carry larger fraction of load which needs correction that is done by governor.
- 42U 19" standard rack 1U=1.75inch ADU - Air Distribution Unit
ARU - Air removing unit,
- Never mix hot and cold aisle
- Use of blanking panel for open space in rack improves air flow
- Use thermostat normally you don't always need 22 degree Celsius 24 degree Celsius is okay in many cases
- Environment cooling can be used to reduce overall cost
- proper cabling, avoid spaghetti of cables
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