This national standard specifies the terms and definitions, model and meaning, working conditions and basic parameters, technical requirements, test items, test methods, mark, packaging, transportation, storage as well as product documentation etc. of the electronic thermo-controllers for transformers for transformers (hereinafter referred to as "thermo-controllers").
This standard is applicable to the electronic thermo-controllers which observe and control the winding temperature of dry-type transformers with their rated voltage of the transformers' low-tension winding of 1kV or lower and oil temperature of oil-filled transformers.
Foreword III
1 Scope
2 Normative References
3 Terms and Definitions
4 Model and Meaning
5 Working Conditions and Technical Parameters
5.1 Working Environment
5.2 Basic Technique Parameters of Thermo-controllers
6 Technical Requirements
6.1 General Requirements
6.2 Limit of error
6.3 Stability
6.4 Influence Quantity
6.5 Safety
6.6 Appearance and Transportation
Table 1 Gradation Rating of the Basic Environmental Conditions
6.7 Control Volume of the Control Type Thermo-controllers
6.8 Electro Magnetic Compatibility
6.9 Output of Remote Signal
7 Test Items
Table 2 Test Items for Display-type and Control-type Thermo-controllers
8 Test Method
8.1 Reference Conditions of Test
8.2 Accuracy-related Test Requirements
Figure 1 Test System at Reference Conditions
8.3 Determination of the Fundamental Error of Indicating Value
8.4 Determination of the Repeatability Error of Indicating Value
8.5 Determination of Time Constant
8.6 Fuzzy Error Test
8.7 Determination of Undulating Quantity
8.8 Drift Determination
8.9 Humid Heat Test
8.10 Mechanical Vibration Test
8.11 Additive Error Determination of the Operational Power Supply Variation
8.12 Grounding Influence Measurement
8.13 Measurement of Lead Resistance Influence
Figure 2 Measurement Method of the Additive Error of Indicating Value and Junction Operation
8.14 Measurement of Environmental Temperature Influence
8.15 Protection Test of the Enclosure
8.16 Insulation Measurement
8.17 Dielectric Strength Test
8.18 High-temperature, Low-temperature and Continuous Impact Test
8.19 Junction Operation Error Measurement
8.20 Switchover Difference Measurement
8.21 Output Control Test
8.22 Electrical Fast Transient Burst Immunity Test
Figure 3 System Map of the Electrical Fast Transient Burst Immunity Test
8.23 Electrostatic Discharge Immunity Test
8.24 Radiated, Radio-frequency, Electromagnetic Field Immunity Test
Figure 5 System Map of the Radiated, Radio-frequency, Electromagnetic Field Immunity Test
8.25 Immunity Test to Conducted Disturbances, Induced by Radio-frequency Fields
8.26 Surge (impact) Immunity Test
8.27 Line Frequency Magnetic Field Immunity Test
8.28 Short Interruption Test of Power Supply
8.29 Short Drop Test of Supply Voltage
8.30 Common Mode Interference Test
8.31 Normal Mode Interference Test
Figure 6 Common Mode Interference Test Circuit
Figure 7 Normal Mode Interference Test Circuit
8.32 Visual Inspection
9 Mark, Packaging, Transportation, Storage and Product Documentation
9.1 Mark
9.2 Packaging
9.3 Transportation
9.4 Storage
Appendix A
Table A.1 Test Items and Technical Index of Remote Analog Quantity Signal
