Schweitzer Engineering SEL-351P - Section 8: Breaker;Recloser Monitor, Battery; System Monitor, Metering, and Load Profile; Introduction; Breaker;Recloser Contact Wear Monitor

Date Code 990430 Breaker/Recloser Monitor, Battery System Monitor, 8-1
Metering, and Load Profile Functions
SEL-351P Manual Técnico
SECTION 8: BREAKER/RECLOSER MONITOR, BATTERY
SYSTEM MONITOR, METERING, AND LOAD
PROFILE FUNCTIONS
I NTRODUCTION
The SEL-351P Recloser Control monitoring functions include:
• Breaker/Recloser Contact Wear Monitor
• Battery System Monitor
In addition to instantaneous metering, the SEL-351P metering functions include:
• Demand Metering
• Energy Metering
• Maximum/Minimum Metering
This section explains these functions in detail.
B REAKER /R ECLOSER C ONTACT W EAR M ONITOR
The breaker/recloser contact wear monitor in the SEL-351P provides information that helps in
scheduling circuit breaker or recloser maintenance. This monitoring function accumulates the
number of internal and external trip operations and integrates the number of close-open
operations and the per-phase current during each opening operation. The SEL-351P compares
the integrated close-open information to a pre-defined breaker or recloser maintenance curve to
calculate the percent contact wear on a per-pole basis. The SEL-351P updates and stores the
contact wear information, and the number of trip operations, in non-volatile memory. You can
view this information through the front-panel display and by communicating with the SEL-351P
through any serial communication port with a computer.
Individual phase Breaker Contact Wear bits, BCWA, BCWB, and BCWC, assert when the
contact wear percentage on their respective phases reaches 100%. You can use these individual
phase elements or the combined result of these elements, BCW (asserts when BCWA or BCWB
or BCWC assert), in a SEL
OGIC
®
Control Equation to alarm or control other functions, such as
block reclosing.
Enable the breaker/recloser contact wear monitor with the global EZ setting Recloser Wear
Monitor (AUTO, Y, N). Access this setting with the SET FZ (global EZ settings) command from
Access Level E (EZ) or Access Level 2. The contact wear monitor is configured as follows:
• Recloser Wear Monitor (AUTO, Y, N) = N disables the contact wear monitor. Setting
EBMON in
Table SECTION 8: .1 is automatically set EBMON = N and the rest of the
settings in
Table SECTION 8: .1 are hidden.
• Recloser Wear Monitor (AUTO, Y, N) = Y enables the contact wear monitor. Setting
EBMON in
Table SECTION 8: .1 is automatically set EBMON = Y, but you must then
use the SET G command (global settings) in Access Level 2 to enter the rest of the