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Mccb Seetings |
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  Feb 3 2009, 02:29 PM
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#1
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 Group: Members Posts: 1 Joined: 3-February 09 Member No.: 5,124  |
WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off).
Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings? |
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Jun 20 2009, 02:14 AM
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#2
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Group: Members Posts: 1 Joined: 10-June 09 Member No.: 5,462 |
QUOTE (jameel @ Feb 3 2009, 10:29 PM)  WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off). Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings? do you have current injector ? if you do, you may test the mccb by injecting 63A. |
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Sep 14 2009, 10:16 PM
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#3
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Junior Member Group: Members Posts: 4 Joined: 14-September 09 Member No.: 6,526 |
QUOTE (jameel @ Feb 3 2009, 11:29 PM) WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off). Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings? there could be many reasons for tripping 1 if the cummulative output current (all lights and sockets etc) exceeds 63 amps 2 if your had a circuit that required a large inrush current (motor or transformer etc) 3 |
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Lo-Fi Version | Time is now: 3rd September 2010 - 05:15 PM |
