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Motor Fault Contribution | Eng-Tips Therefore the motor R X would be different than 0 42 I need the R X value to determine the motor peak short-circuit current contribution The peak short-circuit current (ip) specified in IEC60909 is the peak or crest value of the current wave 1 4 of a cycle after fault inception assuming the fault occured at a voltage zero crossing
Derive R X of transformers from Z%? | Eng-Tips Is it possible to calculate the zero sequence X, positive sequence R X if I was just given the Z% of the transformer, say 11%? Thanks in advance
Initial fault current versus x r ratio in ac system | Eng-Tips I engaged ChatGPT to explain how x r ratio affects fault current In its initial reply, ChatGPT stated that a lower x r ratio results in a higher initial current, which I knew wasn't true I found online test curves comparing initial current for two case, x r=5 and x r=50, the latter resulting
Transformer %Z and X R | Eng-Tips How a transformer %Z(so called percentage of impedance) and X R (reactance versus resistance ratio)being controlled and determine during the manufacturing process? Is there any standard tesing method which can be carried out to ensure the transformer that being sent to site are as per design
LDC settings for a transformer with an LTC tap changer. Hello everyone, My question is about The LDC settings for a transformer with an LTC tap changer How do we calculate the R X settings and also how do we define PT and CT settings? Thanks in advance and best Regards,
Transmission Line Voltage drop rise equation | Eng-Tips Hello All, I am having trouble rectifying an equation for voltage drop IEEE Red book states that voltage drop on a line can be calculated as Vdrop = IRcos(phi) + IXsin(phi) where R, X are the line impedance and phi represents the load angle I is a magnitude I am using the short TLine
X R Ratios | Eng-Tips What is the X R ratio If you are given the %impedance and the X R ratio can you find the total impendance Is the % imepedance given the reactive portion, then do you use the x r ratio to get the real portion
typical transmission line parameters | Eng-Tips has anybody got a ready reference to typical transmission line parameters e g for given voltage and current rating I want to get resistance, reactance etc
Time Constant of Circuit Breakers | Eng-Tips Regarding test X R of breaker - that is based on the standard the breaker was built and tested to If you don't know or have access to the standard, I would ask the manufacturer In the ANSI world, if the calculated symmetrical fault current is less than 80% of the breaker's symmetrical rating, you don't have to worry about the dc offset or X R