1 - AS/NZS 3947.5.4:2000 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - CONTROL CIRCUIT DEVICES AND SWITCHING ELEMENTS-METHODS OF ....
4 - PREFACE
6 - CONTENTS
8 - INTRODUCTION
9 - 1 General
9 - 1.1 Scope and object
9 - 1.2 Normative references
10 - 2 Definitions and lists of symbols used
10 - 2.1 Definitions
10 - 2.1.1 reliability:
10 - 2.1.2 contact reliability:
11 - 2.1.3 failure:
11 - 2.1.4 defect:
11 - 2.1.5 observed failure rate
11 - 2.1.6 assessed failure rate
11 - 2.1.7 constant failure rate period:
11 - 2.1.8 entity; item:
11 - 2.1.9 controlling unit:
11 - 2.1.10 steady state (of the contacts after closing):
11 - 2.1.11 load:
11 - 2.1.12 duty ratio:
12 - 2.1.13 contact voltage drop:
12 - 2.1.14 defect contact voltage drop :
12 - 2.1.15 defect time:
12 - 2.1.16 ON voltage:
12 - 2.1.17 ON time :
12 - 2.1.18 OFF voltage :
12 - 2.1.19 OFF time :
12 - 2.2 List of symbols used
13 - 3 General principles
13 - 4 General test method
14 - 5 General characteristics
14 - 5.1 Measurement methods
14 - 5.1.1 Measurement on the contact (basic method)
15 - 5.1.2 Monitoring the load (alternative method)
16 - 5.2 Sequences of operations
17 - 5.3 Electrical characteristics
17 - 5.3.1 Characteristics of the supply for basic method
18 - 5.3.2 Supply for alternative method
18 - 5.3.3 Characteristics of active load
18 - 5.4 Characteristics of operation
19 - 6 Characterization of defects
19 - 6.1 For the basic method
19 - 6.1.1 Calibration of the detection threshold
19 - 6.1.2 Monitoring (during tm)
19 - 6.2 Monitoring the load (figure 3)
19 - 6.2.1 Voltage drop measurement
19 - 6.2.2 Analysis of the state of the load
19 - 7 Ambient conditions
19 - 7.1 Normal conditions
19 - 7.1.1 Preconditioning
20 - 7.2 Particular conditions
20 - 8 Methods of reporting
20 - 8.1 Failure criterion
20 - 8.2 Reporting the failure rate
20 - 8.2.1 Estimation of ...when failed items are not replaced
21 - 8.2.2 Estimation of ...when failed items are replaced
22 - 9 Information to be provided in the test report
24 - Annex A - Information to be supplied by the manufacturer