The most common power disturbance is the voltage dip or voltage sag. Even small (short) voltage dips can result in service interruptions which last for hours and significant productivity losses. These may be caused at the power utility (lightning), or at the user’s facility, for example when large machines are started up. For digital equipment, voltage dips may even be more dangerous than power failures. For example, PC servers may hang after be supplied with undervoltage for just 8 milliseconds.
The sag directivity module identifies voltage sags and automatically determines their direction relative to the point of monitoring. These are typically referred to as upstream or import disturbances if they originate upstream from the incoming feed, from a higher level or from another branch. The terms downstream or self-generated are used when the disturbance originates from the power consumer itself or from a lower level – seen in relation to the point at which the device is connected.
Knowing where the disturbance comes from, starting with the electrical utility right on up to self-generated, is the first step in eliminating it and protecting productivity – quickly and cost-effectively.
Reactive power compensation systems support in-house electrical systems by minimizing reactive current and improving power factor (previously cos ?). Capacitors are installed to the system to this end, some of which are always connected to the system and others which are connected as required (in some cases several times a day).
Although circuits of this type are quite common, transients may be generated which damage controllers and operating equipment. The most important thing to keep in mind is that transients in PCs and controllers may lead to malfunctioning such as hanging, as well as data loss.
Switching transients of this sort may spread over considerable distances within the electrical system, and may even be amplified in some cases (resonance).
The cap switch module identifies and characterizes these types of interference, as well as the direction from which they originate relative to the point of monitoring, and allow for quick action and limitation of any possible damage.
In the USA alone, there are more than 12.4 million motors with power ratings of greater than 750 W. 2.9 million of these motors fail each year due to electrical interference.
Fact: The procurement costs of a motor amount to only 2 to 5% of its maintenance costs for the entire duration of its service life. And thus it’s plainly apparent that maintenance and a long service life have priority for all facility managers.
Various parameters reduce service life, or are indicative of the momentary status of an electrical motor. These parameters appear in the motor quality display at the MAVOWATT 40 and 70 as a clear-cut, color-highlighted status panel: