ABB RET670 Commissioning Manual

The function activates the PICKUP and PUDIRIN outputs.
3. Assume that φ´ is the phase angle between injected voltage (3V
0
) and current (3I
0
)
i.e. φ´ = RCADir-φ. Change φ´ to for example 45 degrees. Increase the injected
current until the function trips.
4. Compare the result with the set value and make sure that the new injected 3I
0
· 3V
0
·
cos φ is equal to the setting SN_PU. Take the set characteristic into consideration,
see figure
45 and figure 46.
5. Measure the trip time of the timer by injecting 1.2 · VNRelPU and a current to get two
times the set SN_PU trip value.
Tinv I V
test test
= ⋅ ⋅ ⋅
( )
TDSN SRef 3 3
0 0
cos ϕ
ANSIEQUATION2403 V2 EN (Equation 78)
6. Compare the result with the expected value.
The expected value depends on whether definite or inverse time was selected.
7. Continue to test another function or complete the test by setting the test mode to
Disabled.
Operation mode 3I
0
and φ
1. Set the polarizing voltage to 1.2 · VNRelPU and set the phase angle between voltage
and current to the set characteristic angle (RCADir). Note that the current lagging the
voltage.
2. Inject current until the function picks up, and make sure that the trip current is equal
to the INRelPU setting for the set directional element.
Note that for pickup, both the injected current and voltage must be
greater than the set values INRelPU and VNRelPU respectively.
The function activates the PICKUPand PUDIRIN output.
3. Measure with angles j around RCADir +/- ROADir.
4. Compare the result with the set values, refer to figure 47 for example characteristic.
5. Measure the trip time of the timer by injecting a current to get two times the set
SN_PU trip value.
Tinv I V
test test
= ⋅ ⋅ ⋅
( )
TDSN SRef 3 3
0 0
cos ϕ
ANSIEQUATION2403 V2 EN (Equation 79)
6. Compare the result with the expected value.
The expected value depends on whether definite or inverse time was selected.
7. Continue to test another function or complete the test by setting the test mode to
Disabled.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
188 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