Table 196. Current circuit supervision for transformers (CTSRCTF) main settings
Parameter
Function
Value (Range)
Step
Min operate current
CTSRCTF
0.01...0.50 × I
n
0.01
Max operate current
CTSRCTF
1.00...5.00 × I
n
0.01
Max Ng Seq current
CTSRCTF
0.01...1.00 × I
n
0.01
Table 197. Current transformer supervision for high-impedance protection scheme (HZCCxSPVC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the current measured: f
n
±2 Hz
±1.5% of the set value or ±0.002 × I
n
Reset time
<40 ms
Reset ratio
Typically 0.96
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Table 198. Current transformer supervision for high-impedance protection scheme (HZCCxSPVC) main settings
Parameter
Function
Value (Range)
Step
Start value
HZCCxSPVC
1.0...100.0 %I
n
0.1
Alarm delay time
HZCCxSPVC
100...300000 ms
10
Alarm output mode
HZCCxSPVC
1 = Non-latched
3 = Lockout
-
Table 199. Fuse failure supervision (SEQSPVC)
Characteristic
Value
Operate time
1)
NPS function
U
Fault
= 1.1 × set
Neg Seq voltage
Lev
<33 ms
U
Fault
= 5.0 × set
Neg Seq voltage
Lev
<18 ms
Delta function
ΔU = 1.1 × set
Voltage change rate <30 ms
ΔU = 2.0 × set
Voltage change rate <24 ms
1)
Includes the delay of the signal output contact, f
n
= 50 Hz, fault voltage with nominal frequency injected from random phase angle, results based on statistical distribution of 1000
measurements
Table 200. Runtime counter for machines and devices (MDSOPT)
Description
Value
Motor runtime measurement accuracy
1)
±0.5%
1)
Of the reading, for a stand-alone relay, without time synchronization
1MRS759144 A
REX640
Product version: 1
92
ABB
Summary of Contents for RELION REX640
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