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BE1-87G - Maintenance 6-1
CAUTION
Substitution of printed circuit boards or individual components does not necessarily mean
the relay will operate properly. Always test the relay before placing it in operation.
SECTION 6 • MAINTENANCE
GENERAL
BE1-87G Variable Percentage Differential Relays require no preventive maintenance other than a periodic
operational test (refer to Section 5 for the operational test procedures). If factory repair is desired, contact the
Customer Service Department of the Power Systems Group, Basler Electric, for a return authorization number
prior to shipping.
IN-HOUSE REPAIR
In-house replacement of individual components may be difficult and should not be attempted unless appropriate
equipment and qualified personnel are available.
Where special components are involved, Basler Electric part numbers may be obtained from the number
stamped on the component or assembly, the schematic, or parts list. These parts may be ordered directly from
Basler Electric. When complete boards or assemblies are needed, the following information is required.
1. Relay model and style number
2. Relay serial number
3. Board or assembly
a) Part number
b) Serial number
c) Revision letter
4. The name of the board or assembly.
STORAGE
This protective relay contains aluminum electrolytic capacitors which generally have a life expectancy in excess
of 10 years at storage temperatures less than 40C. Typically, the life expectancy of the capacitor is cut in half
for every 10C rise in temperature. Storage life can be extended if, at one-year intervals, power is applied to
the relay for a period of thirty minutes.