ABB RET670 Installation And Commissioning Manual

are given a chance to decay before the trip circuits are restored. When the latches
are released, the handle can be completely withdrawn from the test switch,
restoring the trip circuits to the protection IED.
If a test switch is not used, take measures according to provided circuit diagrams.
Never disconnect the secondary connection of a current transformer
circuit without short-circuiting the transformer's secondary
winding. Operating a current transformer with the secondary
winding open will cause a massive potential build up that may
damage the transformer and injure humans.
13.2.3 Activating test mode
The IED shall be put into test mode before testing. Test mode blocks all functions
in the IED and the individual functions to be tested can be unblocked to prevent
unwanted operation caused by other functions. In this way, it is possible to test
slower back-up measuring functions without the interference from faster measuring
functions. Test mode is indicated when the yellow Start
LED flashes.
Procedure
1. Browse to the TestMode menu and press E.
The TestMode menu is found on the local HMI under Main menu/Test/IED
test mode/TestMode
2. Use the up and down arrows to choose On and press E.
3. Press the left arrow to exit the menu.
The dialog box Save changes appears.
4. Choose Yes, press E and exit the menu.
The yellow startLED above the LCD will start flashing when the IED is in
test mode.
13.2.4 Connecting test equipment to the IED
Connect the test equipment according to the IED specific connection diagram.
The current and voltage terminals must be connected. Pay attention to the current
polarity. Make sure that the connection of input and output current terminals and
the connection of the residual current conductor is correct. Check that the input and
output logical signals in the logic diagram for the function under test are connected
to the corresponding binary inputs and outputs of the IED under test.
To ensure correct results, make sure that the IED as well as the test
equipment are properly grounded before testing.
Section 13 1MRK 504 088-UEN C
Verifying settings by secondary injection
108
Installation and 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