IEEE C37.17-1997 pdf download American National Standard for Trip Devices for AC and General Purpose DC Low Voltage Power Circuit Breakers
1. General
1.1 Scope
This standard pertains to:
1) direct-acting overcurrent electro-mechanical trip devices
2) direct-acting overcurrent electronic trip devices
3) reverse-current trip devices
4) undervoltage trip devices
that are integral with low voltage AC and DC power circuit breakers covered by ANSI/IEEE C37.13, ANSI/IEEE
C37.14, and ANSI C37.16.
1.2 References
The following American National Standards are referred to throughout this standard. When any of these standards are superseded by a revision approved by the American National Standards Institute, the revision shall apply.
ANSI/IEEE C37.13-1990, Low Voltage AC Power Circuit Breakers Used in Enclosures.
ANSI/IEEE C37.14-1992, Low Voltage DC Power Circuit Breakers Used in Enclosures.
ANSI C37.16-1997, Preferred Ratings, Related Requirements and Application Recommendations for Low Voltage
Power Circuit Breakers and Power Circuit Protectors.
ANSI C37.50-1989 (R1995), Standard Test Procedures for Low-Voltage AC Circuit Breakers Used in Enclosures.
ANSI/IEEE C37.90.1-1989, Surge Withstand Capability.
ANSI/IEEE C37.90.2-1987, Withstand Capability of Relay Systems to Radiated Electromagnetic Interference—Trial Use Document.
ANSI C37.100-1992, Definitions for Power Switchgear.
ANSI/NFPA 70-1996, National Electrical Code.
2. Service conditions
For service conditions, depending on the type of low voltage power circuit breaker and its application, reler toANSLIEEE C37.13. ANSLIEEE C3714.
3. Definitions
The definition of terms in this document or in other American National Standards referred to in this document are notintended to embrace all legitimate means of the terms. They are applicable only to the subject treated in this document
An asterisk (*) indicates that at the time this standard was approved, there was no corresponding definition in ANSl)EEE C37.100, while a dagger (f) indicates the definition differs from that in ANSI/EEE C37.100. For additionaldefinitions see ANSIIEEE C3713 and C37.14
Current sensor: A current transforming device, similar to a current transformer, designed specifically for use withelectronic trip device systems, which provides an output signal or signals related to the primary current. The currentsensor may include one or more windings. The output signal or signals of any winding of the current sensor may bevoltage and or current. dependent on the trip device system design.
Direct-acting overcurrent trip device (electromechanical): A release or tripping system that is completely selfcontained in a circuit breaker and which requires no external power or control circuits to cause it to function and isactivated by the electromagnetic forces produced by the current flowing through the circuit breaker. (*)
Direct-acting overcurrent trip device (electronic): A release or tripping system that is completely self contained ina circuit breaker and which requires no external power or control circuits to cause it to function, and is activated bymeans of analog or digital processing of a sampling of the current flowing through the circuit breaker. Informationfunctions, if provided may require external power and/or control circuits. The direct-acting overcurrent trip devicesmay include ground trip elements.
Direct-acting overcurrent trip device current setting: The value of the current setting on which the long time delayphase trip function is based.
Dual trip device: A dual trip device shall consist of: (1) A long-time-delay trip function and (2) A high-rangeinstantaneous trip function.(f)
Ground fault trip element with memory: A ground trip element that responds to an intermittent fault to ground byintegrating the magnitude of the ground arcing current over time. This produces a trip command when the integratedmagnitude exceeds its threshold level unless the time duration of a current magnitude below the pick up settingexceeds a time period specified by the manufacturer.
Low energy trip actuator: A device which functions to open the circuit breaker mechanically when an electricalsignal from the electronic direct-acting overcurent trip device initiates operation. It shall not require external power tooperate.*
IEEE C37.17-1997 pdf download
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