IEEE Std 1250-1995 Corrected EditionSecond PrintingIEEE Guide for Service to Equipment Sensitive to Momentary Voltage Disturbances -Description
Abstract: Computers, computer-like products, and equipment using solid-state power conversion have created entirely new areas of power quality considerations. There is an increasing awareness that much of this new user equipment is not designed to withstand the surges, faults, and reclosing duty present on typical distribution systems. Momentary voltage disturbances occuring in ac power distribution and utilization systems, their potential effects on this new, sensitive, user equipment, and guidance toward mitigation of these effects are described. Harmonic distortion limits are also discussed.
Keywords: disturbance analyzers, faults, harmonic distortion, momentary voltage disturbances, noise, power conditioners, sensitive equipment, surge protection, surges
Content
1. Overview
1.1 Scope
1.2 Problem definition
1.3 Purpose of guide
1. References
3. Terminology
3.1 Definitions
3.2 Differing usage of technical terms
4. Electrical environment
4.1 Steady-state voltage
4.2 Momentary disturbances
4.3 Causes of momentary disturbances
4.3.1 Lightning
4.3.2 Faults (short circuits)
4.3.3 Switching
4.3.4 Motor-starting
4.3.5 Cyclic and variable loads
4.3.6 Tap-changing
4.4 Identifying and quantifying the causes
4.5 Harmonic distortion
5. Sensitive loads
5.1 Types of sensitive loads
5.1.1 Computers
5.1.2 Process control
5.1.3 Telecommunications
5.1.4 Electric arc lighting
5.1.5 Consumer electronics
5.1.6 Adjustable speed drives
5.2 Ride-through capability
6. Solutions
6.1 Utility-side solutions
6.1.1 Measures to minimize interruptions
6.1.2 Static var compensators (SVCs)
6.1.3 Series capacitors
6.2 Customer-side solutions
6.2.1 Changes in equipment operation
6.2.2 Grounding, noise elimination, and circuit design
