IEEE 3004.11-2019 pdf free.IEEE Recommended Practice for Bus and Switchgear Protection in Industrial and Commercial Power Systems.
The word shall indicates mandatoiy requirements strictly to be followed in order to conftrm to the standard and from which no deviation is permitted (shall equals is required to).’
The word should indicates that among several possibilities one is recommended as particularly suitable. without mentioning or excluding others: or that a certain course ol action is preferred but not necessarily required (should equals is recommended that).
The word mm is used to indicate a course of action permissible within the limits of the standard (may equals is permitted to).
The word can is used for statements of possibility and capability, whether material. physical. or causal can equals is able to).
2. Normative references
The folloiiig referenced docuiiiiiis are indispensable for the application of this document (i.e.. these must be understood and used. so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
(‘SA (‘22.1. Canadian Electrical (‘ode.4
(‘SA Z462. Canadian Workplace Electrical Safety Standard.
IEEE Std 3OOl.5. IEEE Recommended Practice t’or the Application of Power Distribution Apparatus in Industrial and Commercial Power Systems.’
IEEE Std 3O04.lTI. IEEE Recommended Practice for theApplication oflnslmmentTranstormers in Industrial and Commercial Power Systems.
IEEE Std 3004 ,51M, IEEE Recommended Practice for the Application of Low-ltage Circuit Breakers in Industrial and (‘ommercial Power Systems.
IEEE Std C37.2TM. IEEE Standard Electrical Power System Device Function Numbers, Acronyms, and Contact Designations.
IEEE Std C37.20.l ‘i’. IEEE Standard for Metal-Enclosed Low-Voltage (1000 Vac and below. 3200 Vdc and below) Power Circuit Breaker Switchgear.
IEEE Std (‘37.2O.2’, IEEE Standard for Metal-Clad Switchgear.
IEEE Std (‘37.20.3TM, IEEE Standard for Metal-Enclosed Internipter Switchgear.
For the purposes of this document, the following terms arid definitions apply. The IEEE Siandarib Duiio,,arv Online should be consuked for terms not defined in this clause.
air core sensors: Also known as Rogowski coils. Specially designed air-core mutual inductor whose output voltage is proportional to the time-rate-of-change ofcurrent of the input (primary) current
arc-nash incident energy: The amount of thermal energy impressed on a surface, a certain distance from the source, generated during an electrical arc event. Incident energy is measured in joules or calories per centimeter squared (J’cm or
bus: A portion of a switchgear. switchboard or distribution system that electrically interconnects several circuit breakers or switches and is protected as a separate entity from other network elemerns. It may also directly connect other elements such as grounding transformers, or a source transformer and the Incoming compartment ofdistrihution equipment.
current transformers ((Ts): A current transtiwmer (CT) transforms line current into current alues suitable for standard protective relays and meters, while isolating these instruments from line voltages. A CT has Iwo windings. designated as primary and secondary, that are insulated from each other. (See IEEE Std 3004.1-2013.)
high-impedance differential scheme: A dif1irential method of bus protection using CTh paralleled on a high- impedance load (a voltage or current relay in series with a stabilizing resistor). Throughout this lest the symbol 87B inside a circle is used to indicate a differential relay in drawings. (See IEEE Std (‘37.234-2009.)
high-oltagc posscr distribution system: A power system with nominal voltage at or above 69 kV.IEEE 3004.11 pdf download.