GENERATOR SELECTION CONTENTS - Diesel Generator

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Note: The relationships between the phase and line voltage and the phase and line current are:- voltage:- √ 3 V ph = V L current:- I ph = I L SECTION 4111 January 1990 Page 7 There is also an alternative way of connecting a 3 phase supply, the delta connection. This, however, does not have a common or neutral point. Note: This relationship between the phase and line voltage and the phase and line current are:- Voltage:- V ph = V L Current:- √ 3 I ph = I L
SECTION 4111 January, 1990 Page 8 Three phase cont’d Whichever method is chosen the open circuit voltage waveforms will be identical, except in magnitude. Below is a waveform picture of a 3 phase sinusoidal a.c. supply:- In view of the complex nature of the above waveform, any theoretical analyses are first reduced to ‘single phase models’. Note it is only a.c. supplies that can be connected in this manner. Three d.c. batteries connected in “delta” merely short circuits all the batteries; and equally, in star, there is no benefit over a conventional single d.c. supply of 3 batteries in parallel. Voltage The output voltage (or electrical pressure) of an a.c. generator depends on the speed of rotation, the number of turns of copper wire in the output winding and the strength of the main magnetic field. The required frequency limits the speed choice and the turns are fixed in the manufacture of the machine; so the only variable is the magnetic field strength. The AVR adjusts this field strength as required by changing the excitation power supplied to the field. Voltage Control Unit (VCU) See Automatic Voltage Regulator.
Page 1 and 2: GENERATOR SELECTION SECTION 4 Janua
Page 3 and 4: SECTION DRAWING SINGLE BEARING WITH
Page 5 and 6: SECTION 4111 January, 1990 Page 2 C
Page 7 and 8: SECTION 4111 January 1990 Page 4 Op
Page 9: SECTION 4111 January, 1990 Page 6 P
Page 13 and 14: Figure 2 Curve (1) machine characte
Page 15 and 16: Introduction OPERATING PRINCIPLES S
Page 17 and 18: SECTION 4131 January, 1990 Page 3 S
Page 19 and 20: A.C. GENERATOR STANDARDS SECTION 43
Page 22 and 23: 1. Basic Data A C GENERATOR SELECTI
Page 24 and 25: POWER RATING SECTION 4311 January,
Page 26 and 27: TEMPERATURE AND TRANSIENT PERFORMAN
Page 28 and 29: CONTROL SYSTEM Stamford a.c. genera
Page 30 and 31: ALTITUDE SECTION 4411 January, 1990
Page 32 and 33: CLIMATE AND ENVIRONMENT SECTION 443
Page 34 and 35: SECTION 4501 January, 1990 Page 2 I
Page 36 and 37: SECTION 4511 January, 1990 Page 2 T
Page 38 and 39: CONSTANT OR STEAD STATE LOADS - SIN
Page 40 and 41: SECTION 4521 January 1990 Page 2 Be
Page 42 and 43: SECTION 4522 January 1990 Page 4 Wh
Page 44 and 45: Since I = kW genr. and I M = kW M _
Page 46 and 47: EXAMPLES OF SELECTION FOR VARIOUS L
Page 48 and 49: LOAD (e) - 3 x 3 h.p. 3 phase motor
Page 50 and 51: SECTION 4595 January 1990 Page 5 In
Page 52 and 53: POWER FACTOR CORRECTION SECTION 459
Page 54 and 55: Example Two - from an actual enquir
Page 56 and 57: Example Three To illustrate motor s
Page 58 and 59: FOREWORD ROTATING DIODE PROTECTION
Page 60 and 61:
SECTION 4901 January 1990 Page 3
Page 62 and 63:
1. INTRODUCTION AND THEORY PARALLEL
Page 64 and 65:
SECTION 4902 January 1990 Page 3 On
Page 66 and 67:
SETTING THE DROOP CIRCUIT SECTION 4
Page 68 and 69:
4. WORKING PROCEDURE SECTION 4902 J
Page 70 and 71:
1. INTRODUCTION THREE PHASE SHORT C
Page 72 and 73:
4. SHORT CIRCUIT CURRENT DECREMENT
Page 74 and 75:
CONTROL FOR GENERATORS IN PARALLEL
Page 76 and 77:
SECTION 4951 January 1990 Page 3 Ma
Page 78 and 79:
SECTION 4952 January 1990 Page 2 Se
Page 80 and 81:
SECTION 4953 January 1990 Page 1 VO
Page 82 and 83:
SECTION 4953 January 1990 Page 3 4)
Page 84:
SECTION 4953 January 1990 Page 5 3)
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