Phase Concordance Unit
 WARNING |
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HAZARD OF INCORRECT OPERATING CONDITIONS
Disable any automation which uses the voltage presence
signal before carrying out the phase concordance test.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
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| NOTICE |
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HAZARD OF INCORRECT OPERATING CONDITIONS
Failure to follow these instructions can result in equipment damage.
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A phase concordance unit checks if the phases of two input units
on the same panel match before turning on the switches. It help ensures
that each of the three cables connects to the correct phase. The unit
must follow the
IEC 62271-215:2021 standard.
Check Before Phase Concordance Test
Check that VDIS versions on each switch function allow the use of the phase concordance unit, refer to the below Table – Check Before Phase Concordance Test.
| WARNING |
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HAZARD OF INCORRECT OPERATING CONDITIONS
Ensure phase concordance does not work between an I switch
function and a Q earthing switch function.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
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I switch function: Operation-independent opening or closing by lever or motor when operated electrically, an operation requires less than 10 s.
Q earthing switch function: Operation-independent opening or closing by lever. Operating energy is provided by a compressed spring which, when released, causes the contacts to open or close.
Check Before Phase Concordance Test
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Test |
Result |
Action |
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Check that the three indicator lights of each VDIS are on. |
The three indicator lights of each VDIS are on. |
The two functional units are energized, the VDIS units are operating and the check can continue. |
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The three indicator lights of one VDIS are off. The functional unit is not energized or the VDIS is malfunctioning. |
Apply power to the functional unit. If VDIS remains unlit, replace it. If necessary, update VDIS so that both are the same version |
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One or two light indicators unlit. |
The VDIS is inoperative, replace it. If necessary, update VDIS so that both are the same version. |
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Checking the phase concordance unit. |
The phase concordance unit is defective. |
Check the phase concordance unit. Refer to the Phase Concordance Unit User Manual. |
A phase concordance unit cannot be used to test VPIS and VDIS. It will result in an indication of phase not in concordance.
Compatibility Test
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Functional unit 1 |
Functional unit 2 |
Compatibility result |
Corrective actions |
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Not OK |
Upgrade unit to VDIS |
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Not OK |
Upgrade unit to VDIS |
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OK |
– |
Phase Concordance Test
When all three indicator LEDs on both VDIS units are lit, it means the phase concordance unit is working correctly and the phase test can be carried out.
The phase concordance unit complying with IEC 62271-215: 2021 standard should work well. Taking phase concordance unit with phase concordance light as shown in below Table – Phase Concordance Test.
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Phase concordance: the phase concordance light remains unlit.
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No phase concordance: the phase concordance unit light is lit.
Phase Concordance Test
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Phase Concordance Test |
Functional unit 2 |
Conclusion regarding phase concordance |
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L1 |
L2 |
L3 |
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Functional unit 1 |
L1 |
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Connection is satisfactory. |
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L2 |
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L3 |
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Functional unit 1 |
L1 |
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Reverse the MV cables connected to L1 and L2 on one of the two functional units. |
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L2 |
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L3 |
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Functional unit 1 |
L1 |
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Reverse the MV cables connected to L2 and L3 on one of the two functional units. |
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L2 |
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L3 |
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Functional unit 1 |
L1 |
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Reverse the MV cables connected to L1 and L3 on one of the two functional units. |
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L2 |
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L3 |
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Functional unit 1 |
L1 |
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Change the position of each MV cable on one of the two functional units. |
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L2 |
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L3 |
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Functional unit 1 |
L1 |
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Change the position of each MV cable on one of the two functional units. |
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L2 |
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L3 |
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Phase concordance unit LED lights |
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LED unlit |