AS 2081.3-1988

1 - AS 2081.3-1988 ELECTRICAL EQUIPMENT FOR COAL AND SHALE MINES - ELECTRICAL PROTECTION DEVICES - EARTH-LEAKAGE PROTECTION DEVIC
4 - PREFACE
4 - CONTENTS
5 - SECTION 1. SCOPE AND GENERAL
5 - 1.1 SCOPE.
5 - 1.2 REFERENCED DOCUMENTS.
5 - 1.3 DEFINITIONS.
5 - 1.3.1 Dynamic range
5 - 1.3.2 Sensitive earth-leakage protection
6 - SECTION 2. DESIGN AND CONSTRUCTION
6 - 2.1 GENERAL.
6 - 2.2 OPERATING VALUE.
6 - 2.3 OPERATING TIME.
6 - 2.3.1 General.
6 - 2.3.2 Main protection devices.
6 - 2.3.3 Back-up protection devices.
6 - 2.4 PROTECTION AGAINST FAULTS.
7 - 2.5 TEST FACILITY.
7 - 2.6 TRIP FACILITY.
7 - 2.7 INDICATION.
7 - 2.8 TRANSFORMERS.
7 - 2.8.1 Current transformers.
7 - 2.8.2 Supply transformers.
7 - 2.9 MARKING.
8 - SECTION 3. TESTS
8 - 3.1 CATEGORIES OF TESTS.
8 - 3.2 ROUTINE TESTS.
8 - 3.2.1 General.
8 - 3.2.2 Verification of operating value.
8 - 3.2.3 Verification of operating time.
8 - 3.3 TYPE TESTS.
8 - 3.3.1 General.
8 - 3.3.2 List and order of tests.
8 - 3.3.3 Operating value test.
8 - 3.3.4 Operating time test.
8 - 3.3.5 Additional tests for core-balance protection devices
8 - 3.3.6 Additional tests for series-neutral protection devices
8 - 3.3.7 Supply voltage variation test.
9 - 3.3.8 Ambient temperature variation test.
9 - 3.3.9 Endurance test.

Specifies requirements for protection devices used to provide earth-leakage protection on a.c. power supply systems incorporating earth-fault current limitation.

This Standard specifies requirements for protection devices used to provide earth-leakage protection on a.c. power supply systems incorporating earth-fault current limitation. The Standard generally recognizes that the protection device will be used in conjunction with an external circuit interrupting device and also that, in practice, protection devices are categorized as follows:(a) Protection devices which are intended to provide the protection for the final subcircuit. Normally such devices are set for instantaneous operation.(b) Back-up protection devices which are provided as a supplement to the main protection device.Normally these devices are set for time delay operation to provide for discrimination within the protection system.This Standard does not include requirements for-(i) circuit interrupting devices;(ii) earth-leakage protection devices falling within the scope of AS 3190; or(iii) earth-fault protection devices for use on unrestricted earth-fault systems.

Under Revision see DR 99411