IEEE C37.90-1989 pdf free

03-10 comment

IEEE C37.90-1989 pdf free.IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus.
Abstract: ANSI/IEEE C37.90-1 989, IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus, applies to relay systems that protect and control apparatus that generate, distribute and use electrical power. This standard defines service conditions and specifies relay performance requirements and performance information that relay manufacturers shall provide.
1. Scope
This standard applies only to relays and relay systems used to protect and control power apparatus. It does not cover relays designed primarily for industrial control, for switching communication or other low-level signals. or any other equipment not in tended for the control of power apparatus.
2. Purpose
The purpose of this standard is to specify standard service conditions, standard ratings, perftrmance requirements, and requirements for testing of relays and relay systems associated with power apparatus.
3. Definition of a Relay
A relay is an electric device designed to respond to input conditions in a prescribed manner and, after specified conditions are met, to cause contact operation or similar abrupt change in associated electric control circuits.
4. Relay Terms and Terminology and Classification by Function
Definitions of relay terms are not included in this standard. Refer to ANSI/IEEE C37.1 00-1981, Definitions for Power Switchgear, for definitions of relay terms. These terms are also included in ANSI/IEEE Std 100-1988. IEEE Standard
Dictionary of Electrical and Electronics Terms.
5. Service Conditions
5.1 Usual Service Conditions
Relays and relaying devices conforming to this standard shall be suitable for operation under the following conditions:
5.1.1 Ambient Temperature
This is the temperature of the air measured 30 cm from the outside surface of enclosures or covers of relay equipment.
This temperature shall be within the limits of—20 °C to 55 °C.
5.1.2 Relative Humidity
The average relative humidity may be up to 55% outside of enclosures or covers for temperatures up to 40 °C, with excursions up to 95% for a maximum of 96 h. without internal condensation.
5.1.3 Altitude
The usual condition of altitude shall be less than 1500 m.IEEE C37.90-1989 pdf free.

Download It Now Download Here

IEEE 82-2002 pdf free

IEEE 82-2002 pdf free.IEEE Standard Test Procedure for Impulse Voltage Tests on Insulated Conductors. Insulated conductors in service are subjected to voltage surges from lightning. switching, and other sources. These surges vary widely in wave shape, magnitude. and frequency of occurrence. Laboratory tests cannot duplicate the wide variety of surges met in service. Standard test procedures. however, make it possible...

IEEE 475-2000 pdf free

IEEE 475-2000 pdf free.IEEE Standard Measurement Procedure for Field Disturbance Sensors 300 MHz to 40 GHz. Abstract: Test procedures for microwave field disturbance sensors to measure radio frequency RF) radiated field strength of the fundamental frequency, harmonic frequencies, near field power flux density, and nonharmonic spurious emissions of sensors operating within the frequency range of 300 MHz to 40 GHz...

IEEE 1277-2000 pdf free

IEEE 1277-2000 pdf free.IEEE Standard General Requirements and Test Code for Dry-Type and Oil-Immersed Smoothing Reactors for DC Power Transmission. Abstract: The electrical, mechanical, and physical requirements of oil-immersed and dry-type air core smoothing reactors for high-voltage direct current( HVDC)applications are specified. Test code is defined and appropriate technical background information is presented or identified. Keywords: construction, dry-type air core,...


Anonymous netizen Fill in information