IEEE C37.11-2014 pdf free.IEEE Standard Requirements for Electrical Control for AC High-Voltage (> 1000 V) Circuit Breakers.
This standard establishes basic requirements for the control schemes of electrically controlled ac high-voltage circuit breakers rated above 1000 V. This standard is applicable to any type of power-operated mechanism and for both ac and de control power. Only the basic control elements of the circuit breaker, including reclosing where required, are included in this standard. This standard does not include devices or circuits for protective relaying, special interlocking, etc, since these are dependent upon the specific application of a particular circuit breaker.
The purpose of this standard is to establish basic requirements for ac high-voltage power circuit breaker control schemes so that users and manufacturers can affect engineering and production economies by reducing the multiplicity of special control schemes that are specified in the absence of standards.
The following referenced documents are indispensable for the application of this document (i.e. they 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.
IEEE Std C37.06TM, IEEE Standard for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis- Preferred Ratings and Related Required Capabilities for Voltages Above 1000 V.
In this document, a valid signal is used to denote a close or trip signal, within the range of control voltage allowed in IEEE Std C37 .06 for the signal type, and which has a duration of at least 50 ms. Also, in this document, any reference to close signal or trip signal is to be interpreted as valid close signal or zalid trip signal as appropriate.
The basic functional requirements of the control scheme for a circuit breaker include the following:
a) The circuit breaker mechanism shall make one complete closing operation, incuding automatic cutoff of closing power, if necessary, after an initiating control device has operated such that a valid signal has been received by the first device in the control scheme. and it has responded, even though the contacts of the initiating control device are opened before the circuit breaker closing operation is completed. There are some definite purpose circuit breakers, with mechanisms specially designed to be able to open and interrupt safely, even during a closing operation, (i.e, before the circuit breaker has fully closed). Circuit breakers of this type are not subject to this requirement.
b) Only one closing operation of the circuit breaker mechanism shall result from each close signal of an initiating control device, even though the circuit breaker trips while the initiating control device is still in the closed position.IEEE C37.11 pdf download.