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What else can I help you with?
How do you detect a fault current?
Put cheese on it.
What are symmetrical and unsymmetrical faults?
the fault in electrical transmission line which give rise to symmetrical fault current is called symmetric fault. e.g; L-L-L-G fault. the fault in transmission line which give rise to unsymmetrical fault current is called unsymmetrical fault.e.g; L-L , L-L-G , L-G fault to solve the unsymmetrical fault, the fault current can be represented by sum of the sequences--zero phase sequence , +ve phase sequence , -ve phase sequence. where L:line G:ground
How do you do earth testing?
One way of "Earth fault testing" is to use a High Pot device. This send a high voltage with a very low current through the equipment and will tell you when there is a leak to ground.
Earth fault relay and an overcurrent relay Methods to energise an earth fault relay?
Earth fault relay and an over current relay Methods to energies an earth fault relay with simulation diagram?
More the transformer impedance less the fault current... so is a high value of transformer impedance good for it?
It depends a lot on the application, i would go with low impedance transformers if am using the transformers for distribution as it will really increase the the maximum fault current. If am using the transformers as step up specially for generators or to charge capacitors, using a high impedance transformer is a good idea as it will decrease the inrush current of the system. you have to see your application and decide what fit that best. Mohammad Jaradat Power Generation Project Manager
What is a high rupture capacity fuse?
This is a fuse that has the ability to interrupt a high fault current.
Why do we say fault currents but not fault voltages?
Because electrical systems are designed to work at a constant voltage, while the current depends on how much power is required. Under fault conditions the current is liable to be very high.
Why is the current high when the voltage is low?
This is describes the condition at the location a short-circuit fault.
Can earth fault current go up passing through the downstream panel and directly cause a trip at the upstream panel which have higher set point of earth fault protection?
If the fault is a direct short to ground, the fault current can be high enough to trip the upstream protection.
What is a bus fault?
When a fault occurs in the electric bus (electric lines and intersections) due to short circuit between the phases or between 1 or more phase and ground, the current value mounts up to a very high value, which is known as bus fault current. This high value of current may cause damages to the transformers and could also rupture the other electric lines connected to the bus.
What is the difference between a ground fault and an arc fault?
A ground fault occurs when an electrical current flows to the ground due to a fault in the wiring or equipment. An arc fault, on the other hand, is a high-energy discharge of electricity between conductors, which can cause fires.
What is the factor of a fuse?
The main factor of a fuse is that it disconnects the supply voltage immediately from a fault load with out the current flashing over fuse link gap and have a continuation of a current flow. ON HRC fused this is done with silica sand. The fault current gets so high that it melts the sand into glass. Glass is an excellent insulator. The fault current is stopped immediately.
How do you calculate maximum earth fault current?
transformer max earth fault current
Why fault currents are low when it is closer to the transmission bus?
Typically fault currents are high at buses. I'm assuming you're referring to fault current from a particular source is low at a specific bus. Fault current will drop off as more resistance is added between the source and the fault (ohms law). This is why fault currents are typically high at a bus - you often have many lines coming into a bus from multiple sources, so the apparent impedance from these sources is less (less resistance).
Why would a power transformer trip on restricted earth fault?
because current entering ct's of High Side is not equal to low side ct's output current
What is fault inception angle?
It the angle between fault current and voltage at the point where the fault occurs.
What neutral ground resistor?
Neutral Ground Resistor is using for minimizing the fault current of system. It is a resistor which connected between ground and neutral and increase the resisting path for fault current.
