Electronic energy and power monitoring apparatus

Apparatus for monitoring an electrical power supply comprising:

• a housing having rear, side top and bottom walls defining an interior chamber extending inwardly from a front access opening;
• a plurality of discrete, spaced apart first conductors mounted upon said bottom wall within said chamber;
• a plurality of polyphase terminals connected to the outwardly disposed surface of said rear wall, each electrically coupled with a predetermined one of said first conductors and removably connectable with a monitoring input from said power supply;
• a plurality of signal output terminals mounted upon said rear wall and extending to a receptor portion within said chamber at a predetermined location upon said rear wall;
• a drawout cradle, slideably insertable through said access opening and nestable within said housing chamber, having receiving means for supporting a plurality of circuit boards in substantially parallel adjaency, a plurality of discrete, second conductors positioned upon said cradle and spaced above said first conductors when said cradle is nestably positioned within said chamber, means defining a multiconductor card connector extending rearwardly from said cradle and insertable within said signal output terminals receptor portion to establish a circuit completing relationship with said terminals;
• connection plug means having a plurality of discrete spaced conductors selectively contactable with said first conductors and said second conductors when inserted within said housing chamber intermediate said first and second conductors, for effecting the conduction of electricity from said first conductors to said second conductors;
• three, voltage monitoring transformers and three, current monitoring transformers mounted upon said drawout cradle, each electrically coupled with a predetermined said second conductor for being energized from said polyphase terminal means with respect to a select phase and having stepped down outputs corresponding therewith;
• readout means including a panel having a deisplay providing visual digital data corresponding with power parameter signals and including processor means for selecting said power parameter signals for effecting said display provision of data, said readout means being mounted upon said cradle, said panel being positioned at said housing opening when said cradle is nestably positioned within said chamber;
• multiplier circuit means mounted upon said drawout cradle, coupled to receive said outputs of said current and voltage transformers and coupled with said readout means and conductors of said means defining a card connector for deriving power parameter signals for selection by said processor means and for assertion at said signal output terminals;
• and
• power supply means connectable with a source of power for effecting energization of said readout means and said multiplier circuit means.

Apparatus for monitoring an electrical power supply, comprising:

• a housing having a rear wall and spaced apart peripheral walls defining an interior chamber;
• first terminal means supported by said housing and connectable with a monitoring input from said power supply;
• second terminal means supported by said housing for providing signal outputs;
• voltage transformer means supported by said housing, and energizable from said first terminal means for providing voltage monitoring function signals;
• current transformer means supported by said housing and energizable from said first terminal means for providing current monitoring function signals;
• readout means having a display providing digital data corresponding with power parameter signls asserted thereto;
• first multiplier network means responsive to said voltage and current monitoring function signals for providing analog watt signals;
• second multiplier network means responsive to said voltage and current monitoring function signals for providing analog Q signals;
• var deriving network means responsive to said analog watt and Q signals to derive analog var signals corresponding therewith;
• voltage-to-frequency converter means responsive to said analog watt and Q signals for deriving said power parameter signals and asserting said power parameter signls at said readout means;
• and
• circuit means for providing said analog var signls as signal outputs of said second terminal means.