GENERATOR SELECTION CONTENTS - Diesel Generator

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POWER RATING SECTION 4311 January, 1990 The most fundamental factor governing the correct sizing of an a.c. generator is the power rating. By consideration of the electrical load likely to be applied to the a.c. generator, the user can estimate the required power rating. This is usually done by adding together the kW ratings of the individual parts of the load to arrive at a total kW power rating figure. Initially every possible load should be included. In addition an allowance for future growth typically between 15% and 20% is common practice. This total kW power rating can now be checked with standard published output lists and an a.c. generator frame size selected. For standby or emergency service, only the essential loads need to be included. Having established the power requirement and possible frame size we need now to look at the specific supply details, environmental conditions and performance criteria required when supplying this particular load. This next stage is the ‘fine tuning’ to ensure that exactly the right size of machine is chosen for the application. It should be noted that standard published output lists usually quote a kVA rating as well as a kW power rating, and is relating these a power factor of 0.8 lagging is assumed:- i.e., kW = 0.8 x kVA Also general different ratings may be quoted for the same machine. Typically three ratings may be quoted. a) Continuous Maximum Industrial Rating - this is the rating to which all others are referred. All performance criteria and technical data will be based on this rating, unless instructions to the contrary are given. When working at this rating all quoted performance figures will be met. b) Standby Duty Rating - this is a higher rating than the continuous maximum industrial rating. It permits a greater continuous output from he machine providing that worsened performance criteria, increased temperature rise and reduced lifetime are acceptable. C) Continuous Marine Rating - this is a lower rating than the continuous maximum industrial rating. All standard performance criteria are met and bettered, but at a 50°C ambient temperature, rather than the 40°C ambient temperature considered for industrial applications. The overall actual temperature of the windings are insulation remains constant
EFFICIENCY AND DRIVE POWER SECTION 4331 January, 1990 The selection of a suitable size of prime mover for an a.c. generator is governed by the electrical power output supplied to the load and the efficiency of the a.c. generator. The relationship is given below:- Where:- kW drive input = kW output η a “kW drive input” defines the prime mover power rating in kilowatts “kW output” defines the electrical power supplied to the load (usually the continuous maximum industrial power rating of the a.c. generator). “ η a” is the efficiency in ‘per unit’ of the a.c. generator. To convert kW input into Horsepower (h.p.) or Cheval Vapeur (C.V.)/Pfedestarke (PS) the following conversations constants should be used. h.p. = kW input 0.746 C.V. or PS = kW input 0.735 In special circumstances the prime mover size may need to be larger than specified above, to copy with particular overload or transient conditions. Consideration of motor load starting torque can be especially relevant when determining prime mover size. The efficiencies of Stamford a.c. generators are given in individual data sheets in Section 6.
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 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
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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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