Advertisement
OVI
UVI
SYN
Voltage check element OVR, UVR, OVI and UVI
• Enter the signal number to observe the operation at the monitoring jack A as shown in
Section 6.5.1.
• Apply a rated voltage as shown in Figure 6.5.1.
OVR and UVR :
• Adjust the magnitude of the voltage applied and measure the value at which the element
operates. Check that the measured value is within ± 5% of the setting.
OVI and UVI :
• Adjust the magnitude of the voltage applied and measure the value at which the element
operates. Check that the measured value is within ± 5% of the setting.
Synchronism check element SYN
• Enter the signal number to observe the operation at the monitoring jack A as shown in
Section 6.5.1.
• Apply rated voltages VR and VI as shown Figure 6.5.1.
Voltage check:
• Set the voltage to any value over the SYNOV setting. (The default setting of SYNOV is 51
V.)
Whilst keeping V I in-phase with V R , increase the single-phase voltage V I from zero volt.
Measure the voltage at which the element operates. Check that the measured voltage is
within ± 5% of the SYNUV setting.
• Further increase V I and measure the voltage at that the element resets. Check that the
measured voltage is within ± 5% of the SYNOV setting.
Phase angle check:
• Set V R and V I to any value between the SYNOV and SYNUV settings keeping V R
in-phase with V I . Then the SYN element operates.
• Shift the angle of V I from that of V R , and measure the angle at which the element resets.
• Check that the measured angle is within ± 5% of the SYN θ setting. (The default setting of
SYN θ is 30°.)
• Change V R and V I , and repeat the above.
279
277
276
⎯
⎯
268
6 F 2 S 0 8 4 2
Advertisement
