ABB RET670 Commissioning Manual

2
2
3
A B C
V V a V a V× = + × + ×
EQUATION1818-ANSI V1 EN (Equation 104)
Where:
A B C
andV V V
EQUATION1820-ANSI V1 EN
are the measured phase voltages
2
3
3
1 0,5
2
j
a e j
p ×
= × = - +
.
IECEQUATION00022 V2 EN
4. Compare the result with the set value of the negative-sequence operating voltage
(consider that the set value 3V2PU is in percentage of the base voltage VBase).
5. Repeat steps
1 and 2. Then slowly increase the measured current in one phase until
the BLKV signal disappears.
6. Record the measured current and calculate the corresponding negative-sequence
current according to the equation (observe that the currents in the equation are
phasors):
2
2
3
A B C
I I a I a I× = + × + ×
ANSIEQUATION00021 V1 EN (Equation 105)
Where:
A B C
I I and I ,
ANSIEQUATION00020 V1 EN
are the measured phase currents
2
3
3
1 0,5
2
j
a e j
p ×
= × = - +
.
IECEQUATION00022 V2 EN
7. Compare the result with the set value of the negative-sequence operating current.
Consider that the set value 3I2< is in percentage of the base current IBase.
11.9.2.3 Measuring the trip value for the zero-sequence function
Measure the trip value for the zero-sequence function, if included in the IED.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
232 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