OBJECTIVE 222.2 WORKSHEET Non-Linear Lad:30 Ft Currents and Wolage Drop 222-WB5 2 1. A 240-volt, 3-ph. 3-wire panel is f

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Objective 222 2 Worksheet Non Linear Lad 30 Ft Currents And Wolage Drop 222 Wb5 2 1 A 240 Volt 3 Ph 3 Wire Panel Is F 1 (71.49 KiB) Viewed 113 times

OBJECTIVE 222.2 WORKSHEET Non-Linear Lad:30 Ft Currents and Wolage Drop 222-WB5 2 1. A 240-volt, 3-ph. 3-wire panel is fed from a 100 KVA 30 transformer that has Z 1.89 on its e e. 23.148 nameplate. The transformer is supplied power from a 3-pole breaker in a 277/480-volt, 3-ph. A wide panel. If the A and the BØ feeder conductors going to the 240 volt panel are shorted" together inside the transformer enclosure, about a. 11.574 b. 6.682 amps of current will flow through the transformer winding. e. 13,365 d. 7.716 2. A 225 KVA transformer has a 120/240-volt, 4-wire delta secondary. The nameplate shows 3.2% 7 The available secondary bolted (line-to-line) fault current is a. 29.297 b. 19,517 amps. c. 5.413 d. 7,200 16,915 3. A 45 KVA transformer is fed from a 3-pole breaker in a 277/490-volt panelboard. The transformer then supplies power to a 120/208-volt, 30,4-wire panelboard. The transformer has Z = 2.2% on its nameplate. The available line-to-line (bolted short-circuit) fault current on the secondary is amps. Any OCP installed on the secondary of this transformer should have an interrupting rating of at least this value. a. 98 b. 5678 c. 9834 d. 4921 e. 2460 4. How much line-to-line fault current is available at the secondary of a 225 KVA 4160 to 120/208-volt, 30. 4-wire transformer? The transformer nameplate has 7 = 2%. a. 20,818 b. 31.227 c. 54,087 d. 62,454 e. 27.063 5. You are installing a 150 KVA, 480-volt to 120/208-volt 3-phase transformer. If the SZ is 2.7. the available fault current on the secondary is amps. a. 26,709 c. 6,682 e. 13.365 b. 15,421 d. 11,574 1. the 6. A 480-volt to 120/208-volt, three-phase transformer is rated for 125 KVA. Z is 4.8%. The available secondary bolted (line-to-line) fault current is amps. a. 6,000 c. 9.273 e. 12,520 b. 6,265 d. 7,228 7. What is the fault current available at the secondary of a 225 KVA 480-volt primary to 120/240- volt 3.4 wire secondary where the transformer impedance is 2%? a. 31.227 b. 20,818 c. 54,087 d. 27.063 e. 62.454 8. A 150 KVA 480 to 120/240-volt, 30,4-wire transformer has Z=2.07% on its nameplate. The available line-to-line (bolted) fault current on the secondary is ___amps. Any OCP installed on the secondary of this transformer should have an interrupting rating of at least this value. a. 1.119 b. 20.114 c. 8.716 d. 17.432 e. 15.097 SV