1 Scope
This Part specifies rules for control units, which perform the switching functions in response to the thermal detectors incorporated in rotating electrical machines according to GB/T 13002-1991, and the industrial application.
It specifies rules for that type of system comprising a positive temperature coefficient (PTC) thermistor detector having particular characteristics, and its associated control unit.
The PT100 detectors are covered by IEC 60751:1983, where the resistor values are given according to the temperatures of the detector.
The present rules lay down the characteristics of association of this particular positive temperature coefficient thermistor detector and its associated control unit (designated “Mark A detector” and “Mark A control unit”), when they are used in thermal protection systems.
Note: It is not possible to specify all the requirements for the operating characteristics of a control unit, as they are dependent on some aspects of the thermal detectors. Some aspects of the requirements of the thermal protector system can only be specified when account is taken of the characteristics of the rotating machine to be protected and the method of installation of the detector within the machine.
For these reasons, for each characteristic it is necessary to specify who is responsible for stating the required values and who is responsible for compliance with the requirement and for carrying out any confirmatory test.
2 Normative References
The following documents contain provisions which, through reference in this Part, become provisions of this Part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents apply. For undated references, the latest edition of the normative document referred to applies.
Contents
Foreword I
Introduction II
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification
5 Characteristics
6 Product Information
7 Normal Service, Mounting and Transport Conditions
8 Constructional and Performance Requirements
9 Tests
Appendix A (Normative) Thermal Detectors Used in Thermal Protection Systems
Appendix B (Normative) Special Tests
Appendix C (Informative) Requirements for Verification of Short-circuit within the Sensor Circuit
