AS 1023.1-1985

1 - AS 1023.1-1985 LOW VOLTAGE SWITCHGEAR AND CONTROLGEAR - PROTECTION OF ELECTRIC MOTORS - BUILT-IN THERMAL DETECTORS AND ASSOCI
4 - PREFACE
5 - CONTENTS
7 - FOREWORD
8 - SECTION 1. SCOPE AND GENERAL
8 - 1.1 SCOPE.
8 - 1.2 REFERENCED DOCUMENTS.
8 - 1.3 DEFINITIONS.
8 - 1.3.1 Thermistor
8 - 1.3.2 Thermostat
8 - 1.3.3 Reference temperature (Tr )
8 - 1.3.4 Control unit
8 - 1.3.5 Rated thermal deviation current of a thermostat
8 - 1.4 APPLICATION OF DEVICE.
8 - 1.5 PROTECTION TYPE CLASSIFICATION.
8 - 1.6 MARKING.
10 - SECTION 2. MOTORS FITTED WITH THERMISTORS
10 - 2.1 GENERAL.
10 - 2.2 TERMINALS.
11 - SECTION 3. TEST ON MOTORS FITTED WITH THERMISTORS OR THERMOSTATS
11 - 3.1 TYPE TESTS.
11 - 3.1.1 Overheating tests.
11 - 3.1.2 Steady overload test.
11 - 3.1.3 Locked-rotor test.
11 - 3.2 ROUTINE TESTS.
11 - 3.2.1 High voltage test.
11 - 3.2.2 Continuity test.
12 - SECTION 4. THERMISTORS
12 - 4.1 TYPES AND IDENTIFICATION-MARKING.
12 - 4.2 CHARACTERISTICS.
12 - 4.3 LEADS.
12 - 4.4 DIELECTRIC WITHSTAND VOLTAGE.
12 - 4.5 REQUIREMENTS FOR THERMISTORS TO WITHSTAND CONDITIONS OF INSTALLATION AND USE
12 - 4.5.1 Thermistors intended to be incorporated in windings prior to impregnation and baking
12 - 4.5.2 Thermistors intended to be incorporated in the machine after impregnation and baking of the windings
13 - 4.5.3 Performance at high temperature.
13 - 4.5.4 Performance at low temperature.
13 - 4.5.5 Performance with respect to magnetic fields in use
13 - 4.6 TYPE TESTS ON PTC THERMISTORS.
13 - 4.6.1 General.
13 - 4.6.2 Verification of the resistance-temperature characteristic
14 - 4.6.3 Verification of dielectric withstand.
14 - 4.6.4 Verification of the suitability of thermistors for for the conditions of use
14 - 4.7 ROUTINE TESTS.
14 - 4.7.1 Tests for characteristic variation of thermistors.
14 - 4.7.2 Dielectric withstand tests on insulated thermistors
15 - SECTION 5. THERMISTOR CONTROL UNIT
15 - 5.1 TERMINALS.
15 - 5.2 STANDARD OPERATING CONDITIONS.
15 - 5.3 OPERATING (TRIP) AND RESET RESISTANCE
15 - 5.4 THERMISTOR APPLIED VOLTAGE.
15 - 5.5 ABNORMAL CONDITIONS.
15 - 5.6 MINIMUM HOLD-IN VOLTAGE.
15 - 5.7 RATED MAKING AND BREAKING CAPACITY
15 - 5.8 ELECTRICAL ENDURANCE OF SWITCHING DEVICES
15 - 5.9 OPERATING TEMPERATURE VARIATION
15 - 5.10 RATED VOLTAGE OF THE THERMISTOR CIRCUIT OF THE CONTROL UNIT
16 - 5.11 DIELECTRIC WITHSTAND VOLTAGE.
16 - 5.12 ABILITY TO WITHSTAND EXTERNAL ELECTRICAL INFLUENCES
16 - 5.13 CONDITIONS OF INSTALLATION.
16 - 5.14 MARKING.
17 - 5.15 TYPE TESTS.
17 - 5.15.1 General.
17 - 5.15.2 Verification of switch-on and switch-off.
17 - 5.15.3 Verification of rated system operating temperature
17 - 5.15.4 Verification of reset temperature.
17 - 5.15.5 Verification of rated making and breaking capacity of switching device.
20 - 5 15. 6 Verification of dielectric withstand voltages
20 - 5.15.7 Verification of performance with respect to abnormal conditions of connection
20 - 5.15.8 Verification of the minimum hold-in voltage
20 - 5.15.9 Verification of the rated voltage of the detector circuit of control units
20 - 5.16 ROUTINE TESTS.
20 - 5.16.1 General.
20 - 5.16.2 Verification of switch-on and switch-off.
20 - 5.16.3 Verification of dielectric voltage withstand.
20 - 5.16.4 Operating tests.
21 - SECTION 6. MOTORS FITTED WITH THERMOSTATS
21 - 6.1 GENERAL.
21 - 6.2 TERMINALS.
22 - SECTION 7. THERMOSTATS
22 - 7.1 GENERAL.
22 - 7.2 CHARACTERISTICS.
22 - 7.3 LEADS.
22 - 7.4 DIELECTRIC WITHSTAND VOLTAGE.
22 - 7.5 ABILITY TO WITHSTAND CONDITIONS OF INSTALLATION AND USE
22 - 7.6 SWITCHING RATING.
22 - 7.7 PERFORMANCE AT HIGH TEMPERATURE.
22 - 7.8 PERFORMANCE AT LOW TEMPERATURE.
22 - 7.9 RATED THERMAL DEVIATION CURRENT.
22 - 7.10 MARKING.
22 - 7.11 TYPE TESTS.
22 - 7.11.1 Verification of operating characteristics.
23 - 7.11.2 Verification of rated making and breaking capacity.
24 - 7.11.3 Verification of electrical endurance.
24 - 7.11.4 Verification of the operating temperature variation
24 - 7.11.5 Verification of dielectric withstand voltage
24 - 7.11.6 Verification of the suitability for the conditions of use
24 - 7.11.7 Verification of performance at high temperature
24 - 7.11.8 Verification of performance at low temperature
24 - 7.12 ROUTINE TESTS.
24 - 7.12.1 Verification of reference temperature
24 - 7.12.2 Dielectric withstand voltage tests.
25 - APPENDIX A - REDUCED VOLTAGE TEST FOR ESTIMATION OF MAXIMUM WINDING TEMPERATURE
26 - APPENDIX B - TYPICAL CHARACTERISTIC CURVE FOR PTC THERMISTOR

Sets out conditions to be met by thermal detectors for building into or onto the windings of electric motors, and by motor control units intended to be used therewith, for protection of the insulation from excessive thermal degradation whilst permitting maximum utilization of the motor's capability. Covers two protection type classifications, viz. the motor protected against overheating when running on load only and against overheating both when running and when stalled.

This standard sets out the conditions to be met by thermal detectors, such as thermistors or thermostats, built into or onto motor windings and sensitive to winding temperatures, together with their control units, if any, as part of a system of thermal protection of electric motors, having a rated voltage not exceeding 1000 V.The standard applies to devices which are responsive to motor temperature only and excludes devices which are -(a) sensitive to current;(b) sensitive to both current and temperature; and (c) designed to carry the motor current.It covers connection of the devices to the motors, tests on motors fitted with the devices, and the specific requirements of the devices and their control units.NOTE: The thermal detectors and control units may be of the automatically resetting or manually resetting types.