Mechanical Protection Settings; Dead Zone Protection; Dead Zone Protection Theory - NR Electric PCS-9611 Instruction Manual

3 Operation Theory

3.19.2 Mechanical Protection Settings

All the settings of the mechanical protection are listed in the following table. For the information
about the common explanation of the settings, see Section 7.3.
No. Menu text
1 MR1.t_Op
2 MR1.En
3 MR1.OutMap
4 MR2.t_Op
5 MR2.En
6 MR2.OutMap
7 MR3.t_Op
8 MR3.En
9 MR3.OutMap
10 MR4.t_Op
11 MR4.En
12 MR4.OutMap

3.20 Dead Zone Protection

3.20.1 Dead Zone Protection Theory

For some wiring arrangement (for example, the circuit breaker is located between the CT and the
line), if a fault occurs between the CT and the circuit breaker, the main protection can operate to
trip circuit breaker quickly, but the fault has not been cleared since the local circuit breaker is
tripped. Here the dead zone protection is needed in order to trip relevant circuit breaker.
This relay provides a one-stage dead zone protection for above mentioned situation. If the circuit
breaker of the protected equipment is opened and the current is greater than the predefined
setting, the dead zone protection will operate.
The following figure shows the logic diagram of the dead zone protection.
3-68
Explanation
The time setting of the No.1 mechanical
protection
The logic setting of the No.1 mechanical
protection
The output matrix setting of the No.1 mechanical
protection
The time setting of the No.2 mechanical
protection
The logic setting of the No.2 mechanical
protection
The output matrix setting of the No.2 mechanical
protection
The time setting of the No.3 mechanical
protection
The logic setting of the No.3 mechanical
protection
The output matrix setting of the No.3 mechanical
protection
The time setting of the No.4 mechanical
protection
The logic setting of the No.4 mechanical
protection
The output matrix setting of the No.4 mechanical
protection
Date: 2014-04-08
Range Step
0~4000s 0.001s
0~1 1
0x00000 ~
1
0xFFFFF
0~4000s 0.001s
0~1 1
0x00000 ~
1
0xFFFFF
0~4000s 0.001s
0~1 1
0x00000 ~
1
0xFFFFF
0~4000s 0.001s
0~1 1
0x00000 ~
1
0xFFFFF
PCS-9611 Feeder Relay