voltage protection device wiring diagram
Over voltage protection is a power supply feature which shuts down the supply or clamps the output when the voltage exceeds a preset level most power supplies use an over voltage protection circuit to prevent damage to the electronic components.
In electrokinetics, the overvoltage designates the fact for a particular element of an electric dipole to have at its terminals a voltage greater than that at the terminals of the complete dipole.
This is the case for example of the voltage at the terminals of a capacitor in a series RLC dipole in resonance.
On the other hand, an electrical network generally has a normal voltage: we also speak of nominal voltage.
In low voltage, this nominal voltage may for example be 230 V between phase and neutral.
In medium voltage, this is standardized at 20 kV (between phase) and 11.5 kV (between phase and earth). The network may accidentally be brought to a higher voltage than its nominal voltage: this is called overvoltage.
Overvoltages are one of the possible causes of electrical or electronic equipment failures, although the latter are better and better protected against this type of incident.
Different types of overvoltage in electrical networks
Permanent overvoltage: lasting several hours (the Ferranti effect can be a cause of permanent overvoltage).
Temporary overvoltage: lasting one or more seconds. A short-circuit of one of the phases of a three-phase network to earth (insulation fault of a HV cable for example) can produce a temporary overvoltage on the other phases (not insignificant phenomenon in high voltage).
Alternator voltage regulation systems can also create temporary overvoltages during transient phenomena. Ferroresonance is a transient or temporary overvoltage.
Operating overvoltage: linked to the operation of a circuit breaker or a disconnector, lasting from a few tens of microseconds to a few milliseconds.
The operation of a disconnector in a gas-insulated substation in particular generates overvoltages with very steep fronts.
Lightning overvoltage: due to the lightning strike of a high voltage line.
voltage protection device wiring diagram
Over voltage protection is a power supply feature which shuts down the supply or clamps the output when the voltage exceeds a preset level most power supplies use an over voltage protection circuit to prevent damage to the electronic components.
In electrokinetics, the overvoltage designates the fact for a particular element of an electric dipole to have at its terminals a voltage greater than that at the terminals of the complete dipole.
This is the case for example of the voltage at the terminals of a capacitor in a series RLC dipole in resonance.
On the other hand, an electrical network generally has a normal voltage: we also speak of nominal voltage.
In low voltage, this nominal voltage may for example be 230 V between phase and neutral.
In medium voltage, this is standardized at 20 kV (between phase) and 11.5 kV (between phase and earth). The network may accidentally be brought to a higher voltage than its nominal voltage: this is called overvoltage.
Overvoltages are one of the possible causes of electrical or electronic equipment failures, although the latter are better and better protected against this type of incident.
Different types of overvoltage in electrical networks
Permanent overvoltage: lasting several hours (the Ferranti effect can be a cause of permanent overvoltage).
Temporary overvoltage: lasting one or more seconds. A short-circuit of one of the phases of a three-phase network to earth (insulation fault of a HV cable for example) can produce a temporary overvoltage on the other phases (not insignificant phenomenon in high voltage).
Alternator voltage regulation systems can also create temporary overvoltages during transient phenomena. Ferroresonance is a transient or temporary overvoltage.
Operating overvoltage: linked to the operation of a circuit breaker or a disconnector, lasting from a few tens of microseconds to a few milliseconds.
The operation of a disconnector in a gas-insulated substation in particular generates overvoltages with very steep fronts.
Lightning overvoltage: due to the lightning strike of a high voltage line.
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