A 3-phase distribution line conductor configuration is as follows: The 12-kV distribution line conductor geometric mean distance (feet) for the crossarm framing shown is most nearly:
O<---3ft--->O<---4ft--->O
(A) 3.5 (B) 4.0 (C) 4.4 (D) 5.0
A 3-phase distribution line conductor configuration is as follows: The 12-kV distribution line conductor geometric mean...
Problem #1 Part I (50 points) Consider the following one-line diagram of a three-phase power system. Assume that the system has the following base quantities: S3 100 MVA, and VbaselL 38 kV at the generator side. The rated line-to-line terminal voltage of the generator (BUS 1) is 38 kV. A single-circuit three-phase transposed overhead line composed by one ACSR Partridge conductor per phase with vertical configuration. The transmission line length is 50 km and the distance between phases a-b, b-c...
Problem 3: A three-phase, 60 Hz transmission line is built with an ACSR conductor. The conductor diameter is 0.68 inch, GMR = 0.023 ft., and AC resistance of 0.342 /mile at 50°C. The conductors are laterally spaced with D= 1.7 m between conductor centers. The line is 50 km long and supplies a 5 MW load. The line to line load voltage is 13.2 kV. [40 points] (a) Find the total impedance of the line. (b) Determine the sending-end voltage,...
Homework 24: Use the ALCOA conductor table from Glover, Sarma, Power System Analysis and Design, for this assignment A 12 kV 60 Hz three-phase three-wire overhead line has Drake ACSR conductors spaced 4 ft apart in an equilateral triangle. It is operating at 50 degrees C. a. Calculate resistance (0.1288 ohms/mile) of one phase of the line b. Calculate series inductance of the line (0.93 uH/m) c. Calculate shunt capacitance of the line. (12.47 pF/m) The line is 20 km...
The ABCD constants of a 3-phase, 500 kV transmission line are D 0.98+0.0014j B 4+60j ohm C 0.0007j siemens The line delivers 500 MVA at 0.9 leading power factor at 500 kV. Determine the voltage regulation of the line. Select one: a -14.28 % b.-611 % c. 27.14 % d.-3.9099 % O O
The diagram shows one phase of a 3-phase generation and
distribution system. We would like to determine the 12 kV short
circuit (maximum) current at the indicated location attributed to
the generation, in the event of a fault.
For this question, we work in the per unit pu system.
a. We pick S(base)=100 MVA, and V(base) = 12 kV. Then I(base)
and Z(base) are fixed. The 12 kV of the transformer secondary is
line-neutral voltage since this is a grounded...
3) The single-line diagram of a three-phase power system is shown in Fig. 1. Equipment ratings are given as follows: G1 1,000 MVA, 15.0 kV, 20.18, o 0.07 pu G2 : 1,000 MVA. 15.0 kV, 攻=エ1 =エ2 = 0.20, ro = 0.10 pu G3 : 500 MVA, 13.8 kV. 1" = 띠 z2 = 0.15, zo 0.05 pu G4 : 750 MVA, 13.8 kV. ェd =ェ1 = 0.30, T2 = 0.40 ro = 0.10 pu Ti : 1,000 MVA. 15.0Δ/765Y...
3) Refer to the one line diagram on the next page. Assuming copper conductor and using the Bussman method, calculate the symmetrical three-phase short-circuit current occurring at fault a F1 b. F2. UTILITY SOURCE 100 MVA, X/R = 12 UTILITY XFMR 2000 KVA W %Z = 5.75, X/R = 5 mm 13.2 kV-480Y/277 V (8 SETS) 4-600 KCMIL & 1-3/0 KCMIL GND IN 4"C (PVC CONDUIT) (50 FEET) MDP - - - - MAIN 3000A 350A 225A - - -...
Transformer TI : 50 MVA, 10 kV Y/138 kV Y, X=0.10 per unit; Transformer T2: 100 MVA, 15 kV D/138 kV Y, X-0.10 per unit; Each 138-kV line: X1-400 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a)Draw the positive-sequence reactance diagram in per-unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine: (b) the The'venin equivalent at the fault, (c) the subtransient fault current...
MIH451 7. The number of claims in a period has a geometric distribution with mean 4. The amount of each claim X follows Pr(X-x) 0.25, x = 1, 2, 3, 4, The number of claims and the claim amounts are independent. S is the aggregate claim amount in the period. Calculate Fs(3).
MIH451 7. The number of claims in a period has a geometric distribution with mean 4. The amount of each claim X follows Pr(X-x) 0.25, x = 1,...
3. For a single-server, single-line, single-phase waiting line system, where l represents the mean arrival rate of customers and m represents the mean service rate, what is the formula for the average utilization of the system? a) l / m b) l / (m-l) c) l2 / m(m-l) d) 1 / (m-l) e) l / m(m-l) 4. For a single-server, single-line, single-phase waiting line system, where l represents the mean arrival rate of customers and m represents the mean service...