Inspection, Maintenance And Adjustment; Maintenance Steps - ABB R-MAG 38kV 1250/2000A Instruction Manual

11. Ensure that all tools are removed.
12. Confirm that all high voltage test connections have been removed.

9. INSPECTION, MAINTENANCE AND ADJUSTMENT

The R-MAG breaker is an extremely simple device and requires minimal maintenance,
depending on the frequency of operation and local environmental conditions.
The safety and successful functioning of any apparatus or system connected with the breaker
largely depends on the proper and reliable operation of the unit.

9.1 Maintenance Steps

To provide long reliable service, the breaker must have systematic inspections at regular inter-
vals. Operating experience based on environmental conditions, the number of operations, mag-
nitude of current and any unusual operation, will establish a maintenance schedule that gives
assurance of proper breaker reliability. The following check list is a minimum guide:
1. Check the phase assemblies for external damage and clean if contamination is evident.
2. Lubricate wear points and all pins in linkage assemblies with grease (Use only Dow Corning
55 silicone lubricants).
3. Verify that the breaker operates correctly using the electrical controls.
4. An AC Hi-Pot test can be performed to verify the vacuum integrity
High-Pot Test for procedure. A successful withstand indicates satisfactory vacuum integrity.
Replace interrupters that fail to maintain voltage across the open contacts. Please contact
the factory for interrupter replacement.
5. Contact Resistance: Measure contact resistance with suitable equipment rated not
less than 100 A DC. The resistance value should not exceed 150 micro ohms.
6. Check heaters to verify proper operation.
7. When inspecting breaker, verify torque on current carrying parts are within tolerances:
.500-13 (or 12mm) threaded bus connections....... 65-80 ft-lbs
. 9.2
Refer to section
11