Basler BE1-11m Instruction Manual Download

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37-4

9424200996

Breaker Monitoring

BE1-11

Table 37-2. Legend for Figure 37-3

Locator

Description

A fault summary report and an oscillograph record are triggered when the Pickup logic

expression becomes true.

During the time that the Trip expression is true, targets are logged from each of the

protective functions that reach a trip state. If a protective function is not being used for

tripping purposes, the associated target function can be disabled through BESTCOMS

Plus

Fault clearing time is calculated as the duration of the time that the Pickup logic expression

is true.

Breaker operate time is calculated as the time from when the Trip logic expression becomes

true until the fast current detector senses that the breaker has successfully interrupted the

current in all poles of the breaker.

A second oscillographic record is triggered to record the end of the fault if the Pickup logic

expression remains in the true state at the time that the first oscillographic record ends. This

second record will have from ¼ to five cycles of pre-trigger data depending upon when the

Pickup logic expression becomes false.

Recorded fault current and voltage magnitudes are displayed on the Targets screen of the

front-panel display. The same information including phase voltage frequency, auxiliary

voltage frequency, and voltage and current angles are recorded in the fault summary report.

The magnitude and angle results are based on data captured two cycles after the trip output

goes true. This two-cycle delay allows the line transients to settle to provide data that is

more accurate. If the Trip expression does not become true, the fault was cleared by a

down-stream device. For these pickup-only events, fault current, voltage, and angle

recorded in the fault summary report will be for the power system cycle ending two cycles

prior to the end of the fault record. This is also the case if the fault record was triggered

through BESTCOMS

Plus

During the time that the Pickup expression is true, the red Trip LED on the front panel

flashes indicating that the BE1-11

is picked up.

During the time the Trip expression is true, the red Trip

LED on the front panel lights

steadily indicating that the BE1-11

is in a tripped state. If targets have been logged for the

fault, the Trip LED is sealed in until the targets have been reset.

Breaker operations and interruption duty functions are driven by the breaker status function.

The operations counter is incremented on breaker opening. The magnitudes of the currents

that are used for accumulating breaker duty are recorded for the power system cycle ending

when the breaker status changes state. Thus, breaker duty is accumulated every time that

the breaker opens even if it is not opening under fault.

Setting group changes are blocked when the Pickup expression is true to prevent protective

functions from being reinitialized with new operating parameters while a fault is occurring.

Setting the Breaker Duty Monitoring Function

BESTCOMS

Plus

Navigation Path:

Settings Explorer, Alarm Configuration, Breaker Monitoring

HMI Navigation Path:

Settings Explorer, Alarm Configuration, Breaker Monitor

Breaker Duty Monitoring settings are made using BESTCOMS

Plus

. Use the Settings Explorer to open the

Alarm Configuration, Breaker Monitoring tree branch shown in Figure 37-4.
Using the pull-down menus and settings boxes, make the application-appropriate settings to the breaker

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