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Monitoring & Metering |
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The F650 provides advanced monitoring and metering that includes: |
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Current Transformer Failure |
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In event of abnormal behaviour of the CT or a loss of phase the F650 detects a change in zero sequence current to initiate a CT failure event and an output that can be used to block critical protection functions. This feature can be inhibited either by zero sequence voltage, ground /sensitive ground current. |
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2nd harmonic inhibit |
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The F650 provides 2nd harmonic detection that can be used to block sensitive elements, especially during transformer energization. The setting can be based on any phase, any two phases, all three phases or an average of the 3 phases. |
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VT Fuse Failure |
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Use the VT Fuse Failure feature to issue an alarm and/or to block voltage driven protection functions that can operate incorrectly due to an abrupt partial or total voltage loss. This loss is caused by the voltage transformers secondary circuit protection fuse failure. Different methods are used to detect the different types of VT fuse failure. |
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Trip Circuit Monitoring |
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F650 can be used to monitor the integrity of both the breaker trip and closing coils and circuits. The supervision inputs monitor both the battery voltage level, while the outputs monitor the continuity of the trip and/or closing circuits, by applying a small current through the circuits. |
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Basic Metering |
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Ia, Ib, Ic, Ig, Isg, Va, Vb, Vc and Vx signals are available locally and remotely and can be stored in the oscillography record or data logger. |
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Event Recording and Oscillography |
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The F650 is capable of storing 479 or 512 (depending on the selected model) time-tagged events (1 ms tagging), to help with troubleshooting. The trigger point, the channels, and sampling rate of the oscillography files are user programmable features. Up to five seconds at maximum sample rate can be stored. |
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