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B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS
CHAPTER 5: SETTINGS
5
BREAKER RESTRIKE 1 HF DETECT
— Enables/disables high-frequency (HF) pattern detection when breaker restrike occurs.
High-frequency pattern is typical for capacitor bank, cables, and long transmission lines applications.
BRK RSTR 1 BRK OPEN
— Assigns a FlexLogic operand indicating the open position of the breaker. It must be logic “1” when
the breaker is open. It is important to assign either 52 contact with this setting or breaker close command with
BRK RSTR 1
CLS CMD
setting to give clear indication to the relay about breaker status.
BRK RSTR 1 OPEN CMD
— Assigns a FlexLogic operand indicating a breaker open command. It must be logic “1” when the
breaker is opened, either manually or from protection logic.
BRK RSTR 1 CLS CMD
— Assigns a FlexLogic operand indicating a breaker close command. It must be logic “1” when the
breaker is closed.
Figure 5-135: Breaker restrike logic
5.8.7.5 CT trouble zone (ANSI 50/74)
SETTINGS
CONTROL ELEMENTS
MONITORING ELEMENTS
CT TROUBLE ZONE 1(2)
This element uses the differential current calculated in accordance with the bus configuration programmed under Bus
Zone 1. Operation of this element is therefore completely dependent on the dynamic bus replica, which must be defined
first. The bus differential zones are defined using the path
SETTINGS
SYSTEM SETUP
BUS
. The CT Trouble element 1
detects CT problems in any of the circuits actually connected to the differential zone defined as Bus Zone 1.
The
CT TROUBLE ZONE 1 PICKUP
setting specifies the differential current level that defines an abnormal bus state. If the
differential current in a given phase remains above this level for the time interval defined by the
CT TROUBLE ZONE 1 DELAY
setting, CT Trouble is declared for the given phase by setting the appropriate FlexLogic output operand.
CT TROUBLE ZONE 1
CT TROUBLE ZONE 1
FUNCTION: Disabled
Range: Disabled, Enabled
CT TROUBLE ZONE 1
PICKUP: 0.100 pu
Range: 0.020 to 2.000 pu in steps of 0.001
CT TROUBLE ZONE 1
DELAY: 10.0 s
Range: 1.0 to 60.0 s in steps of 0.1
CT TROUBLE ZONE 1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
CT TROUBLE ZONE 1
EVENTS: Disabled
Range: Disabled, Enabled
Summary of Contents for b30
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Page 486: ...5 278 B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
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