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Question
Please describe the current setting for the timing element in the K2CA Over-Current Relay(OCR).
Answer
The operating current for the timing element is usually set to approximately 150% of the current value for the contract power. The tap value is obtained from the following formula:
Because the tap value in the K2CA Series can be set in relatively fine increments of 3, 3.5, 4, 5.4, 5, or 6 A, it is quite easy to make the 150% setting to provide optimal overload protection.
The following table shows the relationship between the contract power and the setting tap. The α value in this table is the proportion of the current for the contract power and the OCR operating current, indicating the tap values near the 150% point. The tap value can be easily changed by turning a rotary switch. There is no need to insert a spare tap to prevent an open circuit on the CT2 side as in previous systems.
Contract Power vs. K2CA Timing Element Current Setting
Other Measuring / Motor Protective Relays FAQ
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Does an OTG Zero-phase Current Transformer have polarity?
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Is a specific insertion direction required, and do the input terminals have polarity for the cable of a Zero-phase Current Transformer used with an AGD/K6EL Ground Fault Relay?
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What does instantaneous operation mean for Motor Protective Relays?
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