IEEE C37.113-1999 pdf download IEEE Guide for Protective Relay Applications to Transmission Lines
2. References
This guide shall be used in conjunction with the following publications. When the following standards aresuperseded by an approved revision, the revision shall apply.
IEEE Std 100 -1996,The IEEE Standard Dictionary of Electrical and Electronics Terms, Sixth Edition.
EEE Std C37.2-1996,IEEE Standard Electrical Power System Device Function Numbers and ContactDesignations.
EEE Std C37.90-1989 (Reaff 1994), IEEE Standard for Relays and Relay Systems Associated with ElectricPower Apparatus.
IEEE Std C37.90.1-1989 (Reaff 1994), IEEE Standard Surge Withstand Capability (SWC) Tests for Protective Relays and Relay Systems.
EEE Std C37.100-1992IEEE Standard Definitions for Power Switchgear
IEEE Std C37.109-1988 (Reaff 1999), EEE Guide for the Protection of Shunt Reactors.
IEEE Std C37.110-1996,1EEE Guide for the Application of Curent Transformers Used for ProtectiveRelaying Purposes.
3.Fundamentals
3.1 Terms and definitions
For the purpose of this guide, the following terms and definitions apply. IEEE Std 100-1996 should be referenced for terms and definitions not defined in this subclause.
3.1.1 Transmission line
Terms such as transmission, subtransmission, and distribution lines have different connotations among different companies. Such issues as what constitutes a line terminal may also vary among companies. Clausesof this guide will address the many line configurations and the effect these configurations may have on theprotection of these lines.
For purposes of protection, a “line is defined by the location of the circuit breakers (or other sectionalizingdevices) that serve to isolate the line from other parts of the system. The line includes the sections of bus.overhead conductor, underground cable, and other electrical apparatus (including line traps, series capacitors, shunt reactors, and autotransformers) that fall between these circuit breakers. In Figure l, segments )to 2 and 3 to 4 are defined as lines. It would normally be assumed that two or more stations are involved orthe circuit breakers are too far apart to allow interconnection of control cables and station ground mats.
3.1.2 Zone of protection
There are four basic types of protection zones, as shown in Figure 2. The four types are as follows:
a) Generator
b) Transformer
c) Bus
d) Lines
The boundaries of the zone of protection, as it applies to protective relays, are determined by the locations of the current transformers (CTs) that provide the representation of the line currents to the relays. Overlapping zones of protection is an established protection concept represented by Figure 3.
For pilot communication line protection schemes, the boundaries of the zone of protection are clearly defined. Many line protection practices, however, have unrestricted zones; the start of the zone is defined by the CT location, but the extent of the zone is determined by measurement of system quantities that may vary with generation and system configuration changes.