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Surge diverters are normally located on the terminal pole of an overhead line system, and are intended to protect terminal equipment (e.g. Transformers, cables, etc.) from sudden surges in voltage. Each of the line conductors is normally connected to earth, via the surge diverter.

Under normal circumstances, the internal resistance of the surge diverter is high enough to insulate the line conductor from earth. However, if a voltage surge occurs due, for example, to a lightning strike, then the resistance of the surge diverter will collapse, 'diverting' the surge to earth.

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Q: What is surge divertor?
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What is surge capacitor and how it will works?

A surge capacitor is used to mitigate (minimize) voltage surges. Capacitor impedance can be modeled as 1/jwC, j = i = imaginary value used in vectors, w is the frequency, and C is the capacitance. A fairly small capacitor on the input to a power supplying circuit will have a large impedance, and so will impact the circuit operation very little due to the low power frequency. Surges are high frequency. When a surge occurs, the capacitor impedance appears much smaller to the high frequency surge, effectively shunting the surge energy to ground; this minimizes the surge with respect to the protected circuitry.


Can the surge protectors circuit breaker be reset an unlimited number of times?

Yes, the surge protectors circuit breakers can be reset an unlimited number of times.


What does two fuses in series do?

Two fuses in series could be used as a tap point to pull current to another circuit between the fuses, some times there is a surge fuse designed to blow in the event of an outside voltage surge or a sudden appliance surge due to internal failure.


What is the difference in two surge protectors in series vs two in parallel?

Surge protectors in series will limit based on twice the voltage of one surge protector because, implied by Kirchoff's Voltage Law, voltage drop across components in series is additive.Surge protectors in parallel will protect based on twice the current of one surge protector because, implied by Kirchoff's Current Law, current through parallel components is additive. (Yes, I said "protect" instead of "limit" deliberately because this is a different situation.)However, the parallel configuration is problematic because it depends on the turn-on curve of the surge protector. If one turns on first, and limits the voltage to a specific value, the other surge protector might not turn on at all. In the general case, this will not be a problem, because the turn-on curve does not have a vertical slope, but it would be advisable to consult the device specifications before contemplating this configuration.


What unit of measure is used to describe the amount of work a surge suppressor can do before it stops protecting from electrical surge?

There are 3 items that can be used for surge suppression measurements. Most of the plug in strips use Joules as a measure but this can be very misleading. Joules is a measure of energy. Energy is current (amps) times voltage (volts) times time (seconds) or E=I*V*t. Voltage during a surge is critical in determining if downstream equipment is protected. So low voltage rating are important. Current during a surge is important as this is a measure of how many amps are flowing diverting the surge from the downstream loads. So high surge current rating are important. Time is not generally critical, but is determined by the characteristics of the surge. For standard surge testing, the time is identical for the same waveshape. So Joules appears useful at first glance because it incorporates voltage and current in one measure. However, one can increase the joule rating by increasing the voltage (bad) while decreasing the current (also bad). Joules can also be manipulated by using waveforms that are not standardly used in the industry. So rather than use Joules, it is much better to look at the voltage during a surge and the maximum surge current a product uses and ensure the testing is with a recognized standard surge waveform.