(Solved): Section 18-2: Power Quality Motor Protection. Use Data Sheet G on page 395 to complete the wiring di ...
Section 18-2: Power Quality Motor Protection. Use Data Sheet G on page 395 to complete the wiring diagram and line diagram. Design a circuit using the start/stop pushbutton station and a model N relay to protect against phase loss or phase angle error (adjustable from
5\deg to
15\deg ). Phase angle error takes place in an unbalanced system. The relay is rated for the same voltage as the power lines. Connect the relay into the power circuit to monitor the power lines. Connect the relay contacts so they add protection along with the motor starter overloads. (1) LINE DIAGRAMData Sheet G Phase Angle Error Relay MODEL N Relay for phase angle errors and phase breaking Metering range for phase angle error:
5\deg -15^(')Knob-adjustable phase angle sensitivity Operates irrespective of phase sequence 10 A SPDT output relay LED-indication for relay ON Supply voltage is 3 -phased metering voltage SPECIFICATIONS Inputs Pins 5, 6, and 7 Metering/Supphy voltage
{:[3\times 220VAC],[3\times 300VAC]}-:10%Frequency 50 Hz or 60 Hz Reaction time on phase angle error 1 sec is avalable upon request will reaction firmes up to apperar. 4 sec. Phase angle sensitivity
5^(7)-15^(7) 10%Amplitude sensitivity 30% Mysteresis Approx. 2" WIRING DIAGRAM MODE OF OPERATION Relay meters on ins own 34 supply votage and cortrols mutual phase angle. It operates irrespective of phase sequence when angle error is less than set value. In case of internuption of a phase, relay releases providad that mual phase angle error between flawless phases and phase possibly regeneratud by allocker motors compucied enceeds set whie. Even If phase angle enror does not eaceed set value, relay shall release in case of phase breaking provided that wotage Heganaratiod is below 70 N of nominal voltage.
