Siemens 7SR18 Solkor - Typical Results for Testing 87 BD; Differential Highset 87 HS

7SR18 Commissioning & Maintenance Guide
Unrestricted ©2018 Siemens Protection Devices Limited Page 15
of
Figure 2.3-3 Secondary Injection
2.4 TYPICAL RESULTS FOR TESTING 87BD
87BD
I
NITIAL
SETTING
87BD
1
ST
B
IAS
S
LOPE
SETTING
B
IAS
C
URRENT
(
X
I
N
)
MEASURED ON AMMETER A1
0.00 1.00 1.50 2.00 2.50
Operate Current Measured on Ammeter A2
0.10 0.10 0.10 0.11 0.16 0.21 0.26
0.20 0.20 0.20 0.22 0.33 0.44 0.56
0.30 0.30 0.30 0.35 0.53 0.71 0.88
0.40 0.40 0.40 0.50 0.75 1.00 1.25
0.50 0.50 0.50 0.67 1.00 1.33 1.67
0.50 0.60 0.50 0.86 1.29 1.71 2.14
0.50 0.70 0.50 1.08 1.62 2.15 2.69
Selected Settings Test Results
0.00 1.00 1.50 2.00 2.50
Phase A Pickup
Phase B Pickup
Phase C Pickup
2.5 DIFFERENTIAL HIGHSET 87HS
Differential Highset can be tested by single-phase secondary current injection. These settings will usually be
higher than the continuous thermal rating of the relay current inputs and equipment or test procedure should be
arranged in such a way that the short-term thermal withstand of the relay current inputs is not exceeded during
testing. 50 % of relay setting current can be injected into each relay simultaneously to achieve a differential
current level of 100 % if test current is limited by test equipment capacity.
During testing the Operate current can be monitored on the relay in the Instruments menu.