GENERATOR SELECTION CONTENTS - Diesel Generator

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ALTITUDE SECTION 4411 January, 1990 Up to 1,000m (3,300ft) above sea level, the change in air density is insufficient to radically alter the thermal transfer properties of the air. Above 1,000m the effectiveness of the air is reduced sufficiently to make de-rating necessary. Standards are agreed that to avoid overheating due to this reduction in coolant effectiveness, machines operating at high altitudes must be de-rated. This section gives the necessary de-rating factors for altitudes from 1,000m to 4,000m (3,300ft to 13,200ft) above sea level. Unlike ambient temperature, the converse is not permitted. No greater output is allowed from a machine operating at sea level to one operating at 1,000m above sea level. For altitudes above 1,000m outputs must be multiplied by the following factors: Altitude (m) Multiplier 1,500 0.97 2,000 0.94 2,500 0.91 3,000 0.88 3,500 0.85 4,000 0.82
HUMIDITY SECTION 4421 January, 1990 Humidity is a measure of the moisture content of the air in which a machine is situated. It is normally measured as ‘relative humidity’ (rh) where 100% rh is air fully moisture saturated (i.e. the point at which condensation occurs, see Note 1) and 0% rh is air absolutely dry. (See Note 2). For successful operation in the high humidity levels found in tropical regions, machines are said to be ‘tropicalised’. This involves correct choice of the insulating materials and careful assessment of the impregnation varnish system and methods. All Newage Stamford a.c. generators are tropicalised as standard. NOTE: 1. For consideration of condensation see section 4431 “Anti-condensation heaters”. 2. Definition of relative humidity is the ratio of the pressure of the water vapour actually present in the atmosphere to thepressure of the water vapour which would be present in the same atmosphere if the water vapour were saturated; temperature remaining constant.
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 and 10: SECTION 4111 January, 1990 Page 6 P
Page 11 and 12: SECTION 4111 January, 1990 Page 8 T
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 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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GENERATOR SELECTION CONTENTS - Diesel Generator

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