ABB RET670 Commissioning Manual

1. Keep the measured current as close as possible to its rated value or lower. Keep it
constant during the test, but ensure that it is higher than the set minimum operating
current.
2. Ensure that the maximum continuous current to the IED does not exceed four times
its rated value, if the measurement of the operating characteristics runs under
constant voltage conditions.
3. Make the necessary connections and settings of the test equipment for test of point
1 according to figure
37.
4. Decrease the measured three-phase impedance slowly and observe the operation
value for the signal ZOUT.
5. Compare the operation value with the set value.
6. Do the necessary change of the setting of the test equipment and repeat step 4 and
step 5 for point 2, 3 and 4 according to figure 37.
11.4.9.2 Testing the power swing detection function ZMRPSB (68)
Preconditions
The following output signals shall be configured to binary outputs: ZOUT, measured
impedance within outer impedance boundary, ZIN, measured impedance within inner
impedance boundary and PICKUP, power swing detection.
1. Slowly decrease the measured impedance in all three phases until the PICKUP
signal gets activated.
2. Increase the measured voltages to their rated values.
3. Decrease instantaneously voltages in all three phases to the values, which are
approximately 20% lower than the voltage that gives the set value R1LIn at the
predefined test current.
4. The PICKUP signal must not appear.
5. Increase the measured voltages to their rated values.
11.4.9.3 Testing the
tR1 timer
Preconditions
• The input I0CHECK, residual current (3I
0
) detection used to inhibit the pickup output
must be configured to the output signal PHG_FLT on the FDPSPDIS (21) or
FRPSPDIS (21) function.
• The input BLK_SS, block inhibit of the pickup output for subsequent residual current
detection is connected to FALSE.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
144 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