IEEE 1313.1-1996

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IEEE Standard for Insulation Coordination – Definitions, Principles and Rules

Published By	Publication Date	Number of Pages
IEEE	1996

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Description

Revision Standard – Superseded. The procedure for selection of the withstand voltages for equipment phase-to-ground and phase-to-phase insulation systems is specified. A list of standard insulation levels, based on the voltage stress to which the equipment is being exposed, is also identified. This standard applies to three-phase ac systems above 1 kV.

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PDF Pages	PDF Title
1	1313.1-1996 IEEE Std 1313.1-1996 IEEE Standard for Insulation Coordination—Definitions, Principles, and Rules
3	Introduction
5	CONTENTS
7	IEEE Standard for Insulation Coordination— Definitions, Principles, and Rules 1. Overview 1.1 Scope 1.2 Purpose a) Define applicable terms b) Outline insulation coordination procedures c) Identify standard insulation levels 1.3 Applications
8	2. References
9	3. Definitions 3.1 atmospheric correction factor: A factor applied to account for the difference between the atm… 3.2 basic lightning impulse insulation level (BIL): The electrical strength of insulation express… 3.3 basic switching impulse insulation level (BSL): The electrical strength of insulation express… 3.4 conventional BIL (basic lightning impulse insulation level): The crest value of a standard li… 3.5 conventional BSL (basic switching impulse insulation level): The crest value of a standard sw… 3.6 conventional withstand voltage: The voltage that an insulation system is capable of withstand… 3.7 crest value (peak value): The maximum absolute value of a function when such a maximum exists. 3.8 effectively grounded system: A system in which the neutral points are connected directly to t… 3.9 external insulation: The air insulation and the exposed surfaces of solid insulation of equip… 3.10 front-of-wave lightning impulse voltage shape: A voltage impulse, with a specified rate-of-r…
10	3.11 ground-fault factor: The ratio of the highest power frequency voltage on an unfaulted phase … 3.12 impedance grounded neutral system: A system whose neutral point(s) are grounded through an i… 3.13 insulation configuration: The complete geometric configuration of the insulation, including … 3.14 insulation coordination: The selection of insulation strength consistent with expected overv… 3.15 internal insulation: Internal insulation comprises the internal solid, liquid, or gaseous el… 3.16 lightning impulse protective level of a surge-protective device: The maximum lightning impul… 3.17 lightning overvoltage: A type of transient overvoltage in which a fast front voltage is prod… 3.18 longitudinal insulation configuration: An insulation configuration between terminals belongi… 3.19 longitudinal overvoltage: An overvoltage that appears between the open contact of a switch. 3.20 maximum system voltage, Vm: The highest root-mean-square (rms) phase-to-phase voltage that o… 3.21 nominal system voltage: The rms phase-to-phase voltage by which the system is designated and…
11	Figure 1— Lightning overvoltages (Tr = 0.1–20 µs, Th < 300 µs, where Tr is the time-to-crest valu… 3.22 non-self-restoring insulation: An insulation that loses its insulating properties or does no… 3.23 overvoltage: Voltage, between one phase and ground or between two phases, having a crest val… 3.24 performance criterion: The criterion upon which the insulation strength or withstand voltage… 3.25 phase-to-ground insulation configuration: An insulation configuration between a terminal and… 3.26 phase-to-phase insulation configuration: An insulation configuration between two-phase termi… 3.27 protective margin (PM): The value of the protective ratio (PR), minus one, expressed in perc…
12	3.28 protective ratio (PR): The ratio of the insulation strength of the protected equipment to th… 3.29 resonant grounded neutral system: A system in which one or more neutral points are connected… 3.30 self-restoring insulation: Insulation that completely recovers its insulating properties aft… 3.31 standard chopped wave impulse voltage shape: A standard lightning impulse that is intentiona… 3.32 standard lightning impulse voltage shape: An impulse that rises to crest value of voltage in… 3.33 standard power-frequency short-duration voltage shape: A sinusoidal voltage with frequency b… 3.34 standard switching impulse voltage shape: A full impulse having a time-to-crest of 250 µs an… 3.35 statistical BIL: The crest values of a standard lightning impulse for which the insulation e… 3.36 statistical BSL: The crest value of a standard switching impulse for which the insulation ex… 3.37 statistical withstand voltage: The voltage that an insulation is capable of withstanding wit… 3.38 switching impulse protective level of a surge-protective device: The maximum switching impul…
13	3.39 switching overvoltage: A transient overvoltage in which a slow front, short-duration, unidir… Figure 2— Switching overvoltages (Tr = 20-5000 µs, Th < 20�000 µs, where Tr is the time-to-crest … 3.40 temporary overvoltage: An oscillatory phase-to-ground or phase-to-phase overvoltage that is … 3.41 time-to-crest value (Tr): The time that an impulse rises to crest value. 3.42 time-to-half value (Th): The time that an impulse drops to 0.5 crest value. 3.43 transient overvoltage: A short-duration highly damped, oscillatory or nonoscillatory overvol… 3.44 ungrounded (isolated) system: A system, circuit, or apparatus without an intentional connect… 3.45 very fast front, short-duration overvoltage: A transient overvoltage in which a short durati… 3.46 very fast front voltage shape: This category has not been standardized at this time.
14	Figure 3— Typical very fast front short-duration overvoltages (Tr = 3–100 µs, Th < 3 ms, f1 = 0.3… 3.47 voltage shape: A waveform of a voltage impulse that has been standardized to define insulati… 3.48 withstand voltage: The voltage that an insulation is capable of withstanding. In terms of in… 4. Principles of insulation coordination 4.1 General outline of the insulation coordination procedure a) Determination of voltage stresses b) Selection of the insulation strength to achieve the desired probability of failure 4.2 Determination of the system voltage stress
15	4.3 Comparison of overvoltages with insulation strength 4.4 Selection of standard insulation levels
16	4.5 Low-frequency, short-duration withstand voltages 4.6 Standard BIL and BSL 4.7 Classes of maximum system voltage 4.8 Selection of the equipment standard insulation level
17	Table 1— Standard withstand voltages for Class I (15 kV < Vm ² 242 kV)
18	Table 2— Standard withstand voltages for Class II (Vm > 242 kV)