Question

We often design test circuits for generating surges with specific waveforms to apply surges for testing power equipment. Sometimes, it simulates the effect of a lightning surge, and sometimes, it simulates a switching surge.

OAR1​−100Ω C1​−20μF R2​−2014Ω R3​−1009Ω C2​−0.05μF OB

Figure 2P.3 shows a basic form of an impulse generator. When C1​ has been charged and the gap G is caused to spark over, an impulse voltage is generated at the output terminals A and B.

Without solving the equation of the circuit, compute a good estimate of the following when the precharge voltage is 500 kV and the gap discharges.

a. The maximum current in R2​

Answer 1

To estimate the maximum current in R2, we can use Ohm's Law. The current is equal to the voltage across R2 divided by its resistance.

Step-by-step explanation:

To estimate the maximum current in R2, we need to consider the circuit shown in Figure 2P.3. The circuit consists of a precharged capacitor C1, resistors R2 and R3, and capacitor C2. When the gap G sparks over, an impulse voltage is generated at the output terminals A and B.

The maximum current in R2 can be estimated using Ohm's Law. The current is equal to the voltage across R2 divided by its resistance. Since the voltage across R2 is the same as the voltage across C1 when the gap sparks over, we can calculate it using the given information:

Voltage across C1 = Precharge voltage x R3 / (R2 + R3)

Voltage across R2 = Voltage across C1

Maximum Current in R2 = Voltage across R2 / R2