ABB Relion 670 series - Technical data; Additional security logic for differential protection STSGGIO (11); Introduction

5.2.7 Technical data
Table 87: HZPDIF (87)technical data
Function Range or value Accuracy
Operate voltage (20-400) V
I=V/R
± 1.0% of I
n
Reset ratio >95% -
Maximum continuous
power
V>Pickup
2
/SeriesResistor ≤200 W
-
Operate time 10 ms typically at 0 to 10 x V
d
-
Reset time 105 ms typically at 10 to 0 x V
d
-
Critical impulse time 2 ms typically at 0 to 10 x V
d
-
5.3 Additional security logic for differential protection
STSGGIO (11)
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Additional security logic for differential
protection
STSGGIO - 11
5.3.1 Introduction
Additional security logic for differential protection (STSGGIO , 11) can help the
security of the protection especially when the communication system is in abnormal
status or for example when there is unspecified asymmetry in the communication link.
It helps to reduce the probability for mal-operation of the protection. STSGGIO (11) is
more sensitive than the main protection logic to always release operation for all faults
detected by the differential function. STSGGIO (11) consists of four sub functions:
• Phase-to-phase current variation
• Zero sequence current criterion
• Low voltage criterion
• Low current criterion
Phase-to-phase current variation takes the current samples as input and it calculates the
variation using the sampling value based algorithm. Phase-to-phase current variation
function is major one to fulfill the objectives of the startup element.
Section 5 1MRK505222-UUS C
Differential protection
164
Technical reference manual