ECE 536 HW 4
In the loop system of Figure 12.6 (see below), set and coordinate the phase-overcurrent-type relays around
the loop in the counterclockwise direction for breakers 4, 6, and 9. Use criteria and the settings for the other
relays involved f
ECE 536 HW 2
The feeder of Problem 5.1 has a ground relay connected in the CT circuit that has a burden of 4.0VA at
tap value. The taps available are 0.5, 0.6, 0.8, 1.0, 1.5, 2.0, and 2.5, which represent the minimum pickup
current. What is the maximu
ECE 536 HW 3
High-impedance voltage differential relays are to be applied to protect a three-breaker bus, as shown below.
The CTs are all 600:5 multiratio type. For this application, determine the relay-pickup setting voltage and
the minimum primary-
New York City Blackout of 1977
January 17, 2017
On July 13-14, 1977, New York happened a great electricity blackout that
affected almost whole New York City. According to description of full technical
events by Consolidated Edison System, techn
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Problem # 12.1
following formulae was used to find points on graph
1/ 0 = (0/1)
= (120) = 1.732
I took coordinates(0.06,1000)for-MinMelt and (0.11,1000)for-MaxClear curve and draw the graph
using these coordinates.