Guodian Nanzi PST 691U Transformer Differential Protection Device

1 Functions
1. Differential protection
2. Second harmonic and third harmonic restraint
3. Differential instantaneous protection
4. Differential current over-limit alarm
5. TA break detection
6. Collection of non-electrical protection action information
7. GPS time synchronization (second pulse, minute pulse, or IRIG-B mode)
2.1 Differential Instantaneous Protection
When the differential current of any phase exceeds the differential instantaneous setting value, the device trips.
2.2 Differential Current Over-Limit Alarm
When the differential current of any phase exceeds the differential current over-limit setting value, the device issues an alarm after a delay.
2.3 TA Break
When the transformer is operating at rated current and any phase TA on any side breaks, the device can issue an alarm or block the differential protection based on the control word.
2.4 Setting Calculation
2.5.1 Calculate the rated current of each side of the transformer using the following formula, i.e., the primary balance current

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