BS G 209:1970

Foreword
Specification
1 General
1.1 Scope
1.2 Definitions
1.3 General construction
1.4 Arrangement and construction
1.4.1 Mounting attitude
1.4.2 Mounting arrangement
1.4.3 Interchangeability
1.4.4 Endurance
1.4.5 Internal electrical connections
1.4.6 Maximum operating temperature
1.4.7 Overheating
1.4.8 Current measurement
1.5 Terminals
1.6 Components
1.7 Rating
1.8 Supply characteristics
1.9 Efficiency
1.10 Regulation
1.11 Surges
1.12 Ripple content
1.13 Overload conditions
1.14 Environmental conditions
1.15 Acoustic noise
1.16 Radio interference
1.17 Compass interference
1.18 Cooling
1.19 Declarations
1.20 Marking
1.21 Warning notices
2 Tests
2.1 General
2.2 Test conditions
Type tests
2.3 Performance type tests
2.3.1 Voltage regulation
2.3.2 Transient tests
2.3.3 Efficiency and power factor
2.3.4 Input current
2.3.5 Input current waveform
2.3.6 Ripple and output voltage waveform
2.3.7 Protection circuits
2.3.8 Output current rating
2.3.9 Overload capacity
2.3.10 Hot and cold voltage regulation
2.3.11 Insulation resistance
2.3.12 Inrush current
2.4 Environmental type tests
2.4.1 Climatic
2.4.2 Leakage of hermetically sealed equipment
2.4.3 Vibration
2.4.4 Acceleration
2.4.5 Crash acceleration
2.4.6 Radio interference
2.4.7 Compass safe distance
2.4.8 Salt corrosion
2.4.9 Dust and sand
2.4.10 Contamination
2.4.11 Acoustic noise
2.4.12 Imported and exported voltage transients
Production tests
2.5 Production acceptance tests
2.5.1 Voltage regulation
2.5.2 Input current
2.5.3 Ripple
2.5.4 Protection circuits
2.5.5 Insulation resistance
Quality tests
2.6 Production quality tests
2.6.1 Sampling
2.6.2 Climatic (10-day test)
2.6.3 Vibration
2.6.4 Performance at maximum temperature
2.6.5 Further tests
Appendices
A Salt corrosion test
B Dust and sand test
Figure
1 Measuring device for dust and sand test

Gives the general design and test requirements of transformer rectifier units used in aircraft which includes rectifiers, transformers and associated control and protection equipment. Design and construction of the units are suitable for operation at altitudes up to 13700 m (45000 ft), and over an ambient temperature range of -55 Degrees C to + 70 Degrees C. The rating of variable frequency units shall be declared at a frequency of 320 Hz and preferred nominal current ratings for units at sea level and at a temperature of + 70 Degrees C are 50, 100, 150, 250, 400 amperes. Including salt corrosion test and dust and sand test. Illustrates measuring device for dust and sand test.

This British Standard deals with the general design and test requirements of transformer rectifier units for use in aircraft.