ABB RET670 Commissioning Manual

P1
P3
P4
X
R
LineAngle
Z1Fwd
Z1Rev
P2
IEC11000312-2-en.vsd
IEC11000312 V2 EN
Figure 42: Proposed four test points for phase-to-phase fault
Where,
Z1Fwd
is the forward positive sequence impedance setting for zone 1
Z1Rev is the reverse positive sequence impedance setting for zone 1
LineAngle is the Impedance angle for phase-to-phase fault in degrees
Test points X R
P1 Z1Fwd · sin( LineAngle ) Z1Fwd · cos( LineAngle )
P2 (( Z1Fwd - Z1Rev / 2) · sin( LineAngle )) Z1Fwd / 2 · (1 + cos( LineAngle ) + Z1Rev / 2
· (1 – cos( LineAngle ))
P3 (( Z1Fwd - Z1Rev / 2) · sin( LineAngle )) - Z1Fwd / 2 · (1 – cos( LineAngle ) + Z1Rev / 2
· (1 + cos( LineAngle ))
P4 - Z1Rev · sin LineAngle - Z1Rev · cos( LineAngle )
Change the magnitude and angle of phase-to-phase voltage, to achieve impedances at test
points P1, P2, P3 and P4. For each test point, observe that the output signals, PICKUP and
PU_Z1 are activated where x refers to the actual phase to be tested. After the trip time
delay for the zone 1 has elapsed, the signals TRIP and TRZ1 shall be activated.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
174 Transformer protection RET670 2.2 ANSI
Commissioning manual

ABB RET670 Specifications

General

Rated Frequency	50/60 Hz
Inputs	Analog and binary inputs
Application	Protection of power systems
Communication Protocols	IEC 61850, DNP3, Modbus
Operating Temperature Range	-25°C to +55°C
Mounting	Rack mounted
Number of Binary Inputs	Up to 48
Number of Binary Outputs	32
Protection Functions	Overcurrent Protection
Outputs	Binary outputs
Enclosure	IP 54
Type	Line Differential Protection
Number of Analog Inputs	24