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Advantages of 12 lead 460V,60Hz WYE-DELTA Motor over 6 lead 460V motor
- Thread starter friend81
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Hello friend81
The advantage of 12 leads is important due to the motor could run at two diferent voltages (230 V- 460 V) and could be started in star-delta for both voltages(if the rated connection is delta), if you will use the motor only for 460 V and will be started with a soft-starter or across the line then use a 3 leads motor.
The 12 leads give you more starting options.
Regards
Carlos
The advantage of 12 leads is important due to the motor could run at two diferent voltages (230 V- 460 V) and could be started in star-delta for both voltages(if the rated connection is delta), if you will use the motor only for 460 V and will be started with a soft-starter or across the line then use a 3 leads motor.
The 12 leads give you more starting options.
Regards
Carlos
Most of the time if a submersible motor is wired wye-delta, it is at customer request for starting purposes. Cable is expensive and there are other ways for dual voltage motors to be built that does not require the cable for differing voltages :although dual voltage is not common except on the smaller deepwell submersible motors(we only do up to 30 HP).
They could be using 12 leads to reduced the individual conductor size. This is done because sometimes the cable for a standard 6-lead wye-delta will not fit between the motor/pump and the well casing, or the current demand makes it cost effective. Current and voltage drop are important when sizing the cable, especially since the cable runs can be extremely long (100' is short). We regularly have to upsize cable to get the voltage drop below 5%.
They could be using 12 leads to reduced the individual conductor size. This is done because sometimes the cable for a standard 6-lead wye-delta will not fit between the motor/pump and the well casing, or the current demand makes it cost effective. Current and voltage drop are important when sizing the cable, especially since the cable runs can be extremely long (100' is short). We regularly have to upsize cable to get the voltage drop below 5%.
You need to be more clear.
If by "mechanical type" you mean an Autotransformer type starter, then there is no advantage for using a 12 lead motor for a deepwell pump. But 12 leads allows the alternate use of a Part Winding starter, which is popular in that industry, or a Wye-Delta, which is not popular in the US for deepwell pump systems.
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
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If by "mechanical type" you mean an Autotransformer type starter, then there is no advantage for using a 12 lead motor for a deepwell pump. But 12 leads allows the alternate use of a Part Winding starter, which is popular in that industry, or a Wye-Delta, which is not popular in the US for deepwell pump systems.
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376
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