Negative Sequence Overcurrent Protection Settings; Broken Conductor Protection; Broken Conductor Protection Theory - NR Electric PCS-9611 Instruction Manual

3 Operation Theory
[50/51Q2.Opt_Curve] is the setting for selecting the inverse time characteristic curve;
[50/51Q2.En1] is the binary signal for enabling the NOC2 protection;
[50/51Q2.Blk] is the binary signal for blocking the NOC2 protection.

3.7.3 Negative Sequence Overcurrent Protection Settings

All the settings of the negative sequence overcurrent 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 50/51Q1.I2_Set
2 50/51Q1.t_Op
3 50/51Q1.En
4 50/51Q1.OutMap
5 50/51Q2.I2_Set
6 50/51Q2.t_Op
7 50/51Q2.En
8 50/51Q2.OutMap
9 50/51Q2.Opt_Curve
10 50/51Q2.TMS
11 50/51Q2.tmin
12 50/51Q2.K
13 50/51Q2.C
14 50/51Q2.Alpha

3.8 Broken Conductor Protection

3.8.1 Broken Conductor Protection Theory

The relay incorporates an element which measures the ratio of negative to positive sequence
3-34
Explanation
The current s etting of the stage 1 negative
sequence overcurrent protection
The time setting of the stage 1 negative sequence
overcurrent protection
The logic setting of the stage 1 negative sequence
overcurrent protection
The output matrix setting of the stage 1 negative
sequence overcurrent protection
The current s etting of the stage 2 negative
sequence overcurrent protection
The time setting of the stage 2 negative sequence
overcurrent protection
The logic setting of the stage 2 negative sequence
overcurrent protection
The output matrix setting of the stage 2 negative
sequence overcurrent protection
The setting is for selecting the inverse time
characteristic curve for the NOC2 protection
The time multiplier setting of the negative
sequence IDMT o vercurrent protection
The minimum operation time setting of the
negative sequence IDMT overcurrent protection
Constant "k" for the negative sequence IDMT
overcurrent protection, see Section 3.7.2
Constant "C" for the negative sequence IDMT
overcurrent protection, see Section 3.7.2
Constant "α" for the negative sequence IDMT
overcurrent protection, see Section 3.7.2
Date: 2014-04-08
Range Step
0.05In~4In 0.001A
0.03~100s 0.001s
0~1 1
0x00000 ~
1
0xFFFFF
0.05In~4In 0.001A
0.03~100s 0.001s
0~1 1
0x00000 ~
1
0xFFFFF
0~13 1
0.05~100.0 0.001
0~100s 0.001s
0.001~120.0 0.0001
0.00~1.00 0.0001
0.01~3.00 0.0001
PCS-9611 Feeder Relay