BS 142-1.4.1:1990

Committees responsible
National foreword
Clause
1 Scope and object
2 Definitions
2.1 Common mode voltage
2.2 Differential mode voltage
2.3 Disturbance voltage
3 1 MHz burst disturbance test
3.1 Standard test severity classes
3.2 Test conditions
3.3 Test procedure
3.4 Criteria for acceptance
Figures
1 High-frequency burst disturbance test diagram
2 Coupling circuit for 1 MHz burst disturbance test.
     -Common mode between an independent circuit and
     earth.
3 Coupling circuit for 1 MHz burst disturbance test.
     -Common mode between an independent circuit and
     all other independent circuits coupled to earth.
4a Coupling circuit for 1 MHz burst disturbance test.
     -Differential mode.
4b Coupling circuit for 1 MHz burst disturbance test.
     -Differential mode with inversion of the injection
     direction.
Appendix
A Explanatory notes on disturbance tests for
     measuring relays and protection equipment

Primarily for application to static protection relays, and acceptance criteria to be satisfied during and subsequent to the tests. Also defines test severity classes for relays and the relevant terminology.