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FAQ within [ Protection Relays - MELPRO-A Series ]
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The operating time of the instantaneous factor operating characteristics
That is right. Standard JIS C 4602 defines it shall be 50ms or shorter when 200% of the settling value is input. More Details >>
- No:23706
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MOC
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The viewpoint of the definite time factor characteristic graph
It means multiples of the settling value. For example, when a definite time factor operation settling value of a relay is 3 A, 1x is read as 3 A and 5x is re... More Details >>
- No:23705
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MOC
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It operates. More Details >>
- No:23739
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , COMMON
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It is required that the resistance is lower than 5 ohm for a go and return length using sealed cables. The high voltage receiving facility rule defines “The ... More Details >>
- No:23720
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MDG
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Because between memories, a value becomes unstable, reset the position to the correct position. More Details >>
- No:23738
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , COMMON
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It is impossible. Because the type is to detect by ZCT in an ungrounded system, the sensitivity becomes very high. More Details >>
- No:23727
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MGR
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Because when an undervoltage is detected, b contact will be closed, if power supply (P1-P2) is lost, the contact is retained. More Details >>
- No:23735
- Release Date:2018/09/19 17:16
- Update:2018/09/20 14:58
- Category: Protection Relays - MELPRO-A Series , MUV
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A momentary power interruption is not detectable. More Details >>
- No:23732
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MUV
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This relay uses the input voltage at the VT secondary side (P1-P2) as the relay control power source. When a rated voltage is input, b contact side of the co... More Details >>
- No:23733
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MUV
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Contact recovery delay after applying voltage
This relay has a capacitor to operate in case of the lost power or at the maximum settling of an operation time. Because this capacitor needs a time to be ch... More Details >>
- No:23734
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MUV
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