Recent content by godel123

thanks for all

how to "choose" the seting values to protect a motor, i mean is there a genral considerations or we have to make calculations? exemple of a motor : 50 Kw, 400 V.

hi overcurrent (51) protection. When we see 100 A 0.3 s. so why we talk about curve, but there is only a point

there is also a maximum velocity of the expansion of the spring when closing the valve, which is insured by limiting device in the control panel

Thank you for your answers. as we only have values ​​without Reference to any standard , i'm looking for a document that gives an explanation.

it's a hydraulic actuator the distance between the Christmas Tree and the control-panel is 50 meters

ssv : surface safety valve 15 s : is there a standard or is it a best practice or a company specification ?

hi What is the maximum time expected for SSV to close (by de-energize the hydraulic control of actuator) ?

thanks for your answers.

indeed , passing a direct current will magnetize the CT.

the earthing system (localy buried on field near motors) is not enough for desipation of fault?

it's LV , 3phase +ground, the cable is armored the earthing system is every where aroud the motor location. i thought the use of the metallic armoris enough to use a torus.

if you inject DC==> no induction

hi to feed a motor when should we use (exemple) 4g70 sqmm instead of 3x70?

hi is there a standard talking about the necessity to add an air tank accumulator for BDV or SDV?