-2U
0
=U
ref
Operate area
Instrument
transformer
angle error
2I
0
(prim)
2I
0
(to prot)
Characteristic after
angle compensation
RCAcomp
IEC15000256-1-en.vsdx
RCADir = 0º
IEC15000256 V1 EN-US
Figure 25: Explanation of RCAcomp
Operation mode 2I
0
· 2U
0
· cos φ
GUID-0BB47FD3-AF84-47BC-8983-68CA6F50172C v2
1. Set the polarizing voltage to 1.2 · UNRel> and set the phase angle between
voltage and current to the set characteristic angle (RCADir). Note that the
current shall lag the voltage.
2. Inject current until the function picks up, and make sure that the operate
power is equal to the SN> setting for the set directional element.
The function activates the START and STDIRIN outputs.
Note that for operation, both the injected current and voltage
must be greater than the set values INRel> and UNRel>
respectively.
3. Assume that φ is the phase angle between injected voltage (2U
0
) and current
(2I
0
) i.e. φ = RCADir-φ. Change φ to for example 45 degrees. Increase the
injected current until the function operates.
4. Compare the result with the set value and make sure that the new injected 2I
0
· 2U
0
· cos φ is equal to the setting SN>. Take the set characteristic into
consideration, see Figure
24 and Figure 25.
1MRK 506 377-UEN C Section 10
Testing functionality by secondary injection
Railway application RER670 2.2 IEC 111
Commissioning manual
To Next Page
Loading...
