What is short line interruption?

The short line fault is so‐called because the fault in this case occurs at a short distance along a transmission line from the circuit breaker. The distance of interest is in the order of hundreds of meters to a kilometer or so and the fault is sometimes referred to as a kilometric fault.

What is TRV and RRRV?

Rise of Recovery Voltage (RRRV) of Line. Circuit Breakers in Over Compensated. Transmission Lines.

What causes Transient Recovery Voltage?

TRV is a consequence of different voltage response of the circuits on the source side and load side of the circuit breaker. This difference creates the TRV across the breaker terminals. The standards covering TRV analysis are: IEEE C37.

What is TRV in breaker?

TRV is the voltage difference observed between the breaker terminals immediately after the current interruption of the breaker. It is simply the difference in the power system response voltages on the source side and on the load side of the circuit breaker.

How do you calculate RRRV?

∴ RRRV = Vm ωn sin ωnt The rate of rise of re-striking voltage is directly proportional to the natural frequency. So, the rate of rise of re-striking voltage (RRRV) is dependent upon both the inductance and capacitance of the system.

What is RRR voltage?

It is the rate of increase of restriking voltage and is abbreviated by R.R.R.V.

What is first Pole clear factor?

First pole to clear factor Contact of one pole will open before the other two. And hence, the power frequency recovery voltage across the first pole to open is more than the other two. And this is called as first pole to clear factor. It is given as times the normal system voltage.

What is the difference between Restriking voltage and recovery voltage?

The waveforms of arc voltage, recovery voltage and restriking voltage are shown above. From the waveform, it can be seen that restriking voltage and recovery voltage are simply the voltage across the circuit breaker contacts. The only difference between them is their period of existence.

What is the unit of RRRV?

It is the rate of increase of restriking voltage and is abbreviated by R.R.R.V. its unit is kV/m sec.

What is RRRV state the formula of Restriking voltage?

What is the zero current?

Current zero (CZ) refers to the interruption phenomena in high power circuit-breakers. Today it seems improbable that high voltage circuits could be interrupted economically by other means than the electric arc.

What is Restriking voltage and arc voltage?

The voltage formed across two electrodes in an a.c. circuit at zero current and during the subsequent extinction of an arc between them, causing (if sufficiently high) the restriking of the arc; specifically that across the contacts of a circuit breaker, switch, etc., after they are separated.

What is short-line-fault TRV?

A short-line-fault TRV is characterized by a rate-of-rise that is proportional to the slope of current at the time of interruption and therefore to the amplitude of the short-circuit current : d u d t = Z d i d t {\\displaystyle {\\frac {du}{dt}}=Z{di \\over dt}\\,} , where Z is the surge impedance of the line.

Are the values calculated correct for a short transmission line?

So the values calculated are correct for a short transmission line. From the above equation (1), When I r = 0 that means receiving end terminals is open circuited and then from equation 1, we get receiving end voltage at no load.

What is the end voltage of short transmission line at no load?

As there is no capacitance, during no-load condition the current through the line is considered as zero, hence at no load condition, receiving end voltage is the same as sending end voltage. Here, V r and V x are the per unit resistance and reactance of the short transmission line respectively.

What is a line to line fault?

Line-to-Line Fault. A line to line fault or unsymmetrical fault occurs when two conductors are short circuited. In the figure shown below shows a three phase system with a line-to-line fault phases b and c.