Discussion on how ohmic voltage sensing (OVS) systems in medium voltage switchgear can mitigate primary switching transients and ferroresonance thereby increasing reliability.

Medium-voltage metal-clad switchgear uses protective relays for protection from abnormal conditions, essentially operating the breaker based on input readings. However, the relays need to be isolated from the high voltage of medium-voltage switchgear, which is the role that voltage transformers (VTs) play. VTs have a core and coil design which leaves the switchgear vulnerable to switching transients and ferroresonance issues.

Switching transients are momentary changes in voltage, current or frequency. In power systems, switching transients are initiated by an abrupt change of circuit conditions (i.e., opening or closing of a breaker or contactor).

In medium voltage, ferroresonance is a condition where the inductance of the magnetizing branch of the potential transformer (PT) and the distributed capacitance of the power system conductors excites a situation that causes the PT to falsely represent the actual voltage of the power system and may damage the PT or actuate the fuses on the system.

This video also discusses how an OVS system operates, installation examples, and other benefits of OVS systems.

Watch: Medium-voltage (MV) air insulated and gas insulated switchgear explained
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00:00 Intro
00:43 Measuring medium voltage switchgear
02:05 How OVS works
03:34 OVS in application
04:11 Benefits of OVS

#OVS #ferroresonance #powersystem

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