ABB RET670 Commissioning Manual

11.5.3.2 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were changed
for testing purposes.
11.5.4 Four step residual overcurrent protection, (Zero sequence or
negative sequence directionality) EF4PTOC (51N/67N)
Prepare the IED for verification of settings outlined in Section "Preparing the IED to
verify settings".
Values of the logical signals for D2PTOC are available on the local HMI under Main
menu/Tests/Function status/Current protection/
ResidualOverCurr4Step(51N_67N,4(IN>))/EF4PTOC(51N_67N;4(IN>)):x, where
x = instance number.
The Signal Monitoring in PCM600 shows the same signals that are available on the local
HMI.
11.5.4.1 Four step directional ground fault protection
1. Connect the test set for single current injection to the appropriate IED terminals.
Connect the injection current to terminals A and neutral.
2. Set the injected polarizing voltage slightly larger than the set minimum polarizing
voltage (5% of Vn) and set the injection current to lag the voltage by an angle equal
to the set reference characteristic angle (AngleRCA), if the forward directional
function is selected.
If reverse directional function is selected, set the injection current to lag the
polarizing voltage by an angle equal to RCA+ 180°.
3. Increase the injected current and note the value at which the studied step of the
function trips.
4. Decrease the current slowly and note the reset value.
5. If the test has been performed by injection of current in phase A, repeat the test,
injecting current into terminals B and C with a polarizing voltage connected to
terminals B, respectively C.
6. Block lower set steps when testing higher set steps according to the instructions that
follow.
7. Connect a trip output contact to a timer.
8. Set the injected current to 200% of the trip level of the tested step, switch on the
current and check the time delay.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 181
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