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  2. Silicon controlled rectifier - Wikipedia

    en.wikipedia.org/wiki/Silicon_controlled_rectifier

    A silicon-controlled switch (SCS) behaves nearly the same way as an SCR; but there are a few differences. Unlike an SCR, an SCS switches off when a positive voltage/input current is applied to another anode gate lead. Unlike an SCR, an SCS can be triggered into conduction when a negative voltage/output current is applied to that same lead.

  3. Short circuit ratio - Wikipedia

    en.wikipedia.org/wiki/Short_circuit_ratio

    Short circuit ratio (or SCR) has multiple meanings: Short circuit ratio (synchronous generator) , a value used to characterize the stability of an electromechanical generator Short circuit ratio (electrical grid) , a metric to characterize the grid strength ("stiffness").

  4. Short circuit ratio (synchronous generator) - Wikipedia

    en.wikipedia.org/wiki/Short_circuit_ratio...

    low SCR: in case of a short circuit, the current is proportional to SCR, therefore generators with low SCR require less protection and thus are cheaper; low SCR allows shorter air gap and lower excitation field, both decreasing the size (an cost) of the generator; with low SCR the amounts of iron and copper are reduced, lowering the cost; high SCR:

  5. Short circuit ratio (electrical grid) - Wikipedia

    en.wikipedia.org/wiki/Short_circuit_ratio...

    The SCR can be calculated for each point on an electrical grid. A point on a grid having a number of machines with an SCR above a number between 1 and 1.5 has less vulnerability to voltage instability. Hence, such a grid is known strong grid or power system. A power system (grid) having a lower SCR has more vulnerability to grid voltage ...

  6. TRIAC - Wikipedia

    en.wikipedia.org/wiki/TRIAC

    This, in turn, causes the p, n and p layers over MT2 to behave like a PNP transistor, which turns on because its n-type base becomes forward-biased with respect to its emitter (MT2). Thus, the triggering scheme is the same as an SCR. The equivalent circuit is depicted in Figure 4. However, the structure is different from SCRs.

  7. Glossary of power electronics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_power_electronics

    An electronic AC/DC converter with a DC or AC link. indirect commutation A series of commutations from one principal arm to another or back to the original one by successive commutations via one or more auxiliary arms. indirect (power) conversion Electronic conversion with one or more DC or AC link(s). indirect current link AC converter

  8. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    If you're having problems reading and retrieving your AOL Mail, the following troubleshooting steps: Use AOL Basic Mail. AOL Basic Mail gives you a way to see your emails in a simpler layout.

  9. Insulated-gate bipolar transistor - Wikipedia

    en.wikipedia.org/wiki/Insulated-gate_bipolar...

    An insulated-gate bipolar transistor (IGBT) is a three-terminal power semiconductor device primarily forming an electronic switch. It was developed to combine high efficiency with fast switching. It was developed to combine high efficiency with fast switching.

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