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IEEE 666 2007

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IEEE Design Guide for Electric Power Service Systems for Generating Stations

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IEEE 2007 337
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Revision Standard – Active. This guide applies to station service systems that supply electric power to auxiliary loads for electric power generating stations. The discussions and recommendations in this guide provide the practices, criteria, and range of system parameters that relate to the service system requirements and assist in the application of existing engineering documents. This guide is not a handbook of design data; however, it explains what is good power service systems for generating stations. Remarks: Revision of IEEE Std 666-1991

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PDF Pages PDF Title
1 IEEE Std 666-2007, IEEE Design Guide for Electric Power Service Systems for Generating Stations
6 Introduction
Notice to users
Errata
Interpretations
Patents
7 Participants
8 CONTENTS
17 1. Overview
2. Scope
19 3. System philosophy
3.1 General
3.2 Basic design considerations
3.2.1 Safety
20 3.2.2 Reliability
3.2.3 Cost
3.2.4 Operation
3.2.5 Equipment application
21 3.2.6 Maintenance
3.2.7 Plant expansion
22 3.3 General planning guide
3.3.1 Load analysis
23 3.3.2 Development of plans
39 3.3.3 Evaluating alternatives
40 3.3.4 Preparing equipment specifications
41 3.3.5 Evaluating the bids
3.3.6 Reviewing and finalizing design
3.4 Transmission system and generating unit considerations
3.4.1 Transmission system
42 3.4.2 Generator
44 3.4.3 Unit connections
3.4.4 Station service transformer connections
45 3.4.5 Transformer duty
3.5 Bibliography
47 4. Startup and shutdown requirements
4.1 General
4.2 Power requirements
4.2.1 Continuous capability
48 4.2.2 Short-time overload capability
4.2.3 Transient overload capability
4.2.4 Margin for load growth
4.3 Quality of power
4.3.1 Source availability
49 4.3.2 Frequency
4.3.3 Phasing
4.3.4 Phase balance
4.3.5 Waveform
4.3.6 Voltage control
50 4.4 Startup/shutdown power supply arrangements
51 4.4.1 Auxiliary loads transformer and generator load-break switch/generator circuit breaker
4.4.2 Station service transformer
52 4.4.3 Station service transformer and auxiliary transformer
53 4.4.4 Auxiliary transformer and onsite power source
4.5 Auxiliary equipment supply arrangements
54 4.5.1 Equipment separation for reliability
4.5.2 Equipment separation for protective systems
4.6 Auxiliary bus transfers
55 4.6.1 Manual transfer
4.6.2 Automatic transfer
58 4.6.3 Unit conditions during startup/shutdown transfers
59 4.7 Protective systems
4.7.1 Turbine-generator auxiliary systems
60 4.7.2 Burner management systems
4.7.3 Electrical protection systems
4.7.4 Instrumentation and control systems
4.7.5 Miscellaneous systems
4.8 DC, dc/ac, and ac/dc power sources
61 4.8.1 Storage battery
62 4.8.2 Battery charger
63 4.8.3 Inverter
4.8.4 Uninterruptible power supply (UPS)
65 4.8.5 Motor-generator (M-G) set
66 4.9 Onsite ac power sources
4.9.1 Diesel-engine generators
67 4.9.2 Gasoline and gas-engine generators
4.9.3 Turbine-driven generators
4.10 Bibliography
71 5. Nominal system voltage
5.1 General
5.2 Normative references
72 5.3 Definitions
73 5.4 Preferred nominal system voltages
5.5 Acceptable voltage ranges
74 5.6 Equipment ratings
5.7 Effects of voltage variation in utilization equipment
5.7.1 General effects
5.7.2 Induction motors
76 5.7.3 Synchronous motors
5.7.4 Incandescent lamps
5.7.5 Fluorescent lamps
77 5.7.6 High-intensity discharge lamps
5.7.7 Infrared heating process
5.7.8 Resistance heating devices
5.7.9 Electron tubes
5.7.10 Capacitors
5.7.11 Solenoids
78 5.7.12 Solid-state equipment
5.7.13 Control relays and magnetic starters
5.7.14 Transformers
5.8 Basic design considerations
5.8.1 General
5.8.2 Medium-voltage distribution system
79 5.8.3 Low-voltage distribution system
81 6. Fault considerations
6.1 General
6.2 Normative references
83 6.3 AC fault current-ac component
6.3.1 Rotating machine reactance
85 6.3.2 Generator contribution
86 6.3.3 Synchronous motor contribution
87 6.3.4 Induction motor contribution
6.3.5 Transmission system contribution
6.3.6 Other sources
6.3.7 Total ac waveform
88 6.4 AC fault current-dc component
6.4.1 Symmetry and asymmetry
89 6.4.2 Inductive circuit characteristics
91 6.4.3 Initial magnitude
6.4.4 Effect of resistance
93 6.4.5 DC offset
94 6.5 RMS value of total asymmetrical current
6.5.1 Multiplying factors
95 6.6 Fault types and magnitudes
6.6.1 Types of faults
6.6.2 Magnitudes from symmetrical component theory
97 6.7 Protective devices and equipment short-circuit ratings
98 6.7.1 Circuit breakers
6.7.2 Fuses
99 6.7.3 Relays
6.7.4 Other equipment
100 6.8 Fault calculation tools
6.8.1 Single-line diagram
6.8.2 Selection of fault location
101 6.8.3 Type of fault
6.8.4 Impedance diagram
102 6.8.5 Per-unit system
103 6.8.6 Transformers
107 6.8.7 Equivalent impedance
108 6.8.8 System X/R ratio
6.8.9 Symmetrical fault current determination
109 6.8.10 Multipliers
6.8.11 Assumptions and limitations
110 6.9 AC fault calculation procedure
6.9.1 Fault Duty Type 1
113 6.9.2 Fault Duty Type 2
114 6.9.3 Fault Duty Type 3
115 6.9.4 Fault Duty Type 4
119 6.10 DC system fault current
120 6.10.1 Sources of dc fault current
122 6.10.2 Circuit protection
6.10.3 Total dc fault current
6.10.4 DC fault calculation procedure
123 6.11 Bibliography
125 Annex 6A (informative) Short-circuit calculation examples
143 7. System protection
7.1 General
7.1.1 Purpose
7.1.2 Plant operating characteristics
7.1.3 Design features
144 7.1.4 Planning a protective system
7.2 System arrangement
145 7.2.1 Basic relaying features
146 7.2.2 Zones of protection and coordination
147 7.3 Types and characteristics of protective devices
7.3.1 General
151 7.3.2 Overcurrent protection relays
152 7.3.3 Overcurrent relays with voltage restraint or voltage control
7.3.4 Ground relays
153 7.3.5 Directional relays
7.3.6 Voltage relays
7.3.7 Differential current relays
7.3.8 Pressure and gas-sensing relays
7.3.9 Fuses
154 7.4 Principles of relay applications
7.4.1 General
7.4.2 Transformer protection
158 7.4.3 Motor protection
162 7.4.4 Switchgear, substation, and motor control center protection
164 7.4.5 Cable protection
168 7.5 Bibliography
169 8. System grounding
8.1 Foreword
8.2 General
8.3 Normative references
170 8.4 Definitions
171 8.5 Transient overvoltages
172 8.5.1 480 V systems
173 8.6 Selection of grounding method
8.6.1 Ungrounded systems
174 8.6.2 Ground-fault damage
175 8.6.3 Ground-fault relaying considerations
176 8.6.4 Grounding resistance value
177 8.7 Grounding equipment connections
180 8.8 Ground-fault current calculations
8.8.1 Resistance-grounded system
8.8.2 High-resistance grounded system
8.9 Standby generator grounding
8.9.1 Solid grounding
181 8.9.2 Ungrounded and high-impedance grounding
8.9.3 General
8.10 Summary
8.10.1 Solidly grounded system
8.10.2 Resistance-grounded system
8.10.3 High-resistance grounded system
182 8.10.4 Ungrounded system
8.11 Bibliography
185 9. Transformers and voltage regulation
9.1 General
9.2 Scope-System configurations
9.3 Normative references
186 9.4 Definitions (also see 3.3.2.4.1)
9.5 Voltage range
9.6 Specification of transformers
9.6.1 General
9.6.2 Specification content
187 9.6.3 Rating in kilovoltamperes
190 9.6.4 Service conditions
9.6.5 Voltage ratings and taps
191 9.6.6 Insulation level
192 9.6.7 Connections
194 9.6.8 Impedance and frequency
195 9.6.9 Terminal facilities
196 9.6.10 Surge protection
9.6.11 Short-circuit capability and related conditions
198 9.6.12 Sound level
199 9.6.13 Evaluation of losses
9.6.14 Accessories and protective devices
201 9.6.15 Tests
202 9.6.16 Tank and foundation requirements
9.6.17 Shipping requirements
9.7 Voltage regulation
9.7.1 General
9.7.2 Voltage range of medium-voltage bus
203 9.7.3 Voltage range of low-voltage bus
9.7.4 Voltage range of generators
9.7.5 Voltage regulation of unit auxiliary transformers
9.7.6 Total voltage regulation consideration
9.7.7 Transient voltage regulation due to motor starting
204 9.7.8 Methods for improvement
205 9.8 Bibliography
207 10. Equipment Used for Load Switching and Fault Isolation
10.1 General
10.2 Normative references
208 10.3 Switchgear
10.3.1 Circuit arrangements
209 10.3.2 Load grouping
10.3.3 Future loads
10.3.4 Motor sizes
210 10.3.5 Controls and interlocks
211 10.3.6 Duty
212 10.3.7 Materials
10.3.8 Motor controllers
214 10.4 Secondary unit substations
10.4.1 General
216 10.4.2 Standard configurations
10.4.3 Continuous ratings
217 10.4.4 Breaker coordination system
218 10.4.5 AC circuit breaker fault-interrupting ratings
222 10.4.6 DC circuit breaker fault interrupting ratings
223 10.4.7 Electrical protection, control, and interlocks
10.5 Combination starter panels (motor control centers [MCC])
10.5.1 Description of equipment
226 10.5.2 Protection and control
228 10.5.3 Interlocks
10.5.4 Wiring
229 10.6 Panelboards
10.6.1 General
10.6.2 Panelboard ratings
231 10.7 Fuses
10.7.1 General
10.7.2 Application
232 10.8 Insulation levels of equipment
10.9 Equipment layout and installation
10.9.1 Phasing
10.9.2 Grounding
233 10.9.3 Safety
10.10 Shipping and storage
10.11 Maintenance
10.11.1 General
234 10.11.2 Frequency of inspection
10.11.3 Activities
235 10.11.4 Spare parts
10.11.5 Accessories
10.12 Bibliography
237 11. Electric motor characteristics and applications
11.1 General
11.2 Normative references
238 11.3 Large polyphase ac motors
11.3.1 Induction motors
244 11.3.2 Multispeed motors
11.3.3 Wound-rotor induction motor
246 11.3.4 Synchronous motors (salient pole type)
252 11.3.5 AC adjustable-speed drives
255 11.4 Integral horsepower (medium) ac motors
11.4.1 General purpose ac motor classification
11.4.2 Rating structure
258 11.4.3 Polyphase motors-NEMA design and code letters
260 11.4.4 Temperature rise for integral horsepower (medium) ac motors
261 11.5 DC motors
11.5.1 DC motor types
262 11.5.2 DC motor performance relationships
263 11.6 AC motor applications
11.6.1 Motor selection factors
11.6.2 Pump drive applications
267 11.6.3 Fan drive applications
269 11.6.4 Coal pulverizer applications
270 11.6.5 Horizontal and vertical motor application considerations
11.6.6 Motor operated valve applications for integral horsepower ac motors
273 11.7 DC motor applications
11.7.1 Power plant applications
11.7.2 Control of dc motors
274 11.8 Starting large ac motors
11.8.1 Full voltage starting
275 11.8.2 Reduced voltage starting
11.8.3 Motor modifications for starting
11.8.4 Frequency of starts
276 11.9 Effects of system operating conditions on motor characteristics
11.9.1 Voltage and frequency variation
285 11.10 Effects of motor operation on the power system
11.10.1 Motor starting voltage dip
286 11.10.2 Motor short-circuit contributions
11.10.3 Bus transfer or fast reapplication of power (reclosing) for large ac motors
288 11.11 Motor protection requirements
289 11.11.1 Protection of motor windings
291 11.11.2 Protection related to mechanical problems
11.11.3 Synchronous motor protection
11.11.4 Bus transfer protection
292 11.12 Effects of special requirements on motor characteristics
11.12.1 Low-voltage starting and/or high starting torque
11.12.2 Capability of accelerating high inertia load
11.12.3 Low starting current
11.12.4 High ambient temperature
11.13 Effects of exceeding specified motor capabilities
293 11.13.1 Mechanical overload
11.13.2 Continuous operating voltage
11.13.3 Operation outside specified frequency variation
11.13.4 High ambient temperature
11.13.5 Starting voltage below specified minimum
294 11.13.6 Excessive frequency of starting
11.14 Motor enclosures
11.14.1 Enclosure definitions
11.14.2 Motor enclosure application in power plant environment
295 11.15 Motor bearings
296 11.16 Maintenance
11.17 Relationships used in ac motor performance and system calculations
297 11.17.1 Induction motor equivalent circuit
11.17.2 Induction motor torque
298 11.17.3 Motor and driven equipment acceleration
301 12. Cables and other conductors
12.1 General
12.2 Normative references
302 12.3 Insulated cable
303 12.3.1 Service conditions
12.3.2 Cable application criteria
304 12.3.3 Cable terminology
305 12.3.4 Cable components
306 12.3.5 Cable characteristics
12.3.6 Cable system design
313 12.3.7 Installation practice
314 12.3.8 Design guides and practices
12.4 Nonsegregated phase bus
315 12.4.1 Conductors and enclosures
316 12.4.2 Temperature limitations on ambient air
319 13. Physical and environmental aspects
13.1 General
13.2 Service transformers
320 13.2.1 Unit auxiliaries transformers
13.2.2 Station service (startup) transformers
13.2.3 Unit substation (load-center) transformers
321 13.2.4 Lighting transformers
13.3 Switchgear
13.3.1 Medium-voltage switchgear (greater than 600 V)
322 13.3.2 Load centers (unit substations) (600 V or less)
13.3.3 Motor control centers
323 13.3.4 Panelboards
13.4 Space, growth, and cable entry
13.4.1 Space
13.4.2 Growth
324 13.4.3 Cable entry
13.5 Ambient temperature
13.5.1 Equipment ratings
325 13.6 Elevation
13.7 Expected life and reliability
13.7.1 Mechanical failures
326 13.7.2 Chemical failures
13.7.3 Common event failures
13.8 Enclosures
327 13.8.1 NEMA enclosures
13.8.2 Hazardous (classified) locations
328 13.8.3 Division 2 locations
329 13.8.4 Station battery system
330 13.8.5 Hydrogen and welding gas storage
13.8.6 Ash-handling locations
13.9 Indoor versus outdoor
13.10 Flooding
331 13.11 Noise
13.11.1 Planning
332 13.12 Fire protection
13.12.1 Unprotected areas
13.12.2 Flammable liquid hazard
13.12.3 Control rooms and consoles
333 13.12.4 Coal-handling areas
334 13.12.5 Transformer areas
13.12.6 Steam turbine (hydrogen-cooled) generators
335 13.12.7 Cooling towers
13.13 Bibliography
IEEE 666 2007
$60.13