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Medium-voltage Power Distribution Products
FAQ within [ Medium-voltage Power Distribution Products ]
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Confirmation method of the start-up value
Set the display selection switch on the front upper right of the relay to “Time limit pass.” When a relay detects near the operation value, “0” will be displ... More Details >>
- No:23716
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MOC
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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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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:23730
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MGR
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That is described as below. (1) By laying ZCTs for two feeders having different loads, detected by one earth fault directional relay. In this case, it i... More Details >>
- No:23726
- Release Date:2018/09/19 17:16
- Update:2018/09/20 13:26
- Category: Protection Relays - MELPRO-A Series , MGR
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The prohibition position sets the maximum settling value. With the definite time current, all prohibition positions set 6 A, and with the instantaneous curre... More Details >>
- No:23714
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MOC
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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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Operating time of undervoltage detection
It operates with a settled operation time. More Details >>
- No:23731
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MUV
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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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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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The application of the overcurrent relay
It is possible. Connect R-phase to the terminal for R-phase of the relay, and T-phase to the terminal for T-phase of the relay. And the direction of a curren... More Details >>
- No:23709
- Release Date:2018/09/19 17:16
- Category: Protection Relays - MELPRO-A Series , MOC
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