Sync Check Settings

Sync Check Available/Not Available

This setting makes Sync Check available or not available for configuration and operation. When this setting is set to Available, Sync Check may be configured and per unitt into service on WSOS or the O.I. If set to Not Available, Sync Check is not available for configuration or operation.

Type: Configurable
Range: Sync Check Available or Sync Check Not Available
Default: Sync Check Not Available
If enabled, the sync check feature will helps to prevent IEC 61850 close commands where the sources do not meet the configured Sync Check parameters
WSOS5 incorporates Sync Check Close Retry notification.

Sync Check ON/OFF

Setting this option to OFF means that no synchronism verification will occur before a Close operation. When Protection is ON and the Sync Check ON/OFF setting is ON, every operator close operation will be validated by the Sync Check function.

Type: Configurable
Range: Sync Check ON or Sync Check OFF
Default: Sync Check OFF

Sync Check Active/Inactive

This setting is only displayed on the O.I.s to indicate if the Sync Check functionality is operational.

Type: Read only

Phase Compensation ON/OFF

Setting this option to OFF means that the Sync Check function will not take into account the closing time of the switchgear and if there is a difference between frequencies it is possible that the phase angles can be out of sync when the switchgear contacts close. Setting this option to ON means that Sync Check will compensate for the time it takes for the switchgear to close and the phase drifting due to the frequency difference between the two sides when a manual close is issued. It is usually recommended that Phase Compensation be enabled.

Type: Configurable
Range: Phase Compensation ON or Phase Compensation OFF
Default: Phase Compensation ON

Automatic Close Retry ON/OFF

When this option is set to OFF, the Sync Check function will not retry the close operation if the original request is denied. When this option is set to ON the Sync Check will close the switchgear if the source and load become synchronized within the retry period.

Type: Configurable
Range: Retry ON or Retry OFF
Default: Retry OFF

Automatic Close Retry Period

When Automatic Close Retry is ON, this setting provides the time period after a rejected close operation by Sync Check within which the close operation is performed if voltage, frequency and phase become synchronized. The Retry Period setting defines the time period after a close request was issued on unsynchronized conditions during which the Automatic Close Retry functionality may close if synchronism is detected.

Type: Configurable
Range: 1 to 600 s
Default: 300 s

When PMSet U Series switchgear is used with external CVT’s there exist an error of up to approximately 3% between the voltage measured by the internal CVT’s and the external CVT’s. This error is due to the temperature difference that can exist between the different CVT’s. It is recommended that an allowed voltage amplitude difference of at least 0.05 per unit be selected.

Allowed Voltage Difference

This setting provides the voltage difference in per unit* values within which a close operation is allowed.

Type: Configurable
Range: 0.02 per unit to 0.50 per unit
Default: 0.02 per unit

Allowed Voltage Minimum

This setting provides the minimum voltage limit in per unit values above which a close operation is allowed.

Type: Configurable
Range: 0.50 per unit to (Allowed Voltage Max – Allowed Voltage Difference)
Default: 0.50 per unit

Allowed Voltage Maximum

This setting provides the maximum voltage limit in per unit values below which a close operation is allowed.

Type: Configurable
Range: (Allowed Voltage Minimum + Allowed Voltage Difference) to 2.00 per unit
Default: 2.00 per unit

Allowed Frequency Difference

This setting provides the maximum allowed frequency difference in Hz within which a close operation is allowed. The allowed frequency difference is constrained by the allowed phase difference.

Type: Configurable
Range: 0.04 Hz to 2.20 Hz
Default: 0.10 Hz

Allowed Frequency Minimum

This setting provides the minimum frequency limit in Hz above which a close operation is allowed.

Type: Configurable
Range: 45 Hz to (Allowed Frequency Max – Allowed Frequency Difference)
Default: 45 Hz

Allowed Frequency Maximum

This setting provides the maximum frequency limit in Hz below which a close operation is allowed.

Type: Configurable
Range: (Allowed Frequency Min + Allowed Frequency Difference) to 65Hz
Default: 65 Hz

Allowed Frequency Rate of Change

This setting provides the maximum allowed frequency rate of change in Hz/s below which a close operation is allowed.

Type: Configurable (WSOS only)
Range: 0.05 Hz/s to 0.50 Hz/s
Default: 0.10 Hz/s

Allowed Phase Difference

This setting provides the maximum allowed phase angle difference in degrees within which a close operation is allowed. The allowed phase difference is constrained by the allowed frequency difference. Note that the effective allowed phase difference is smaller to compensate for measurement errors.

Type: Configurable
Range: 2° to 90°
Default: 6°

WARNING
HAZARD OF UNEXPECTED EQUIPMENT OPERATION Generator must not connect to a grid with a large phase angle differences. Person must stay away from the generator. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Nominal Phase to Earth Voltage

This setting is a duplicate of the Nominal Phase to Earth setting displayed on the measurement pages. Changing either setting changes the other.

Type: Configurable
Range: 2000 V to 25000 V
Default: 6300 V