Sel 710 pdf

Sel Relay Manual. Reply to author. Report message as abuse. Show original message. Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message. The SEL is designed and tested to exceed applicable standards, including those for vibration, electromagnetic compatibility, and adverse environmental conditions.

Time-Overcurrent Elements One level of the inverse time element is available for phases A, B, C, and negative-sequence overcurrent. Also, two levels of inverse time Arc-Flash Protection An arcing short circuit or a ground fault in low- or medium-voltage switchgear can cause very serious equipment damage and personal injury.

They can also cause prolonged and expensive downtime. The best way to minimize the impact of an arc-flash event is to reduce the detection and circuit breaker tripping times.

Conventional protection may need several cycles to detect the resulting overcurrent fault and trip the breaker. In some cases, there may not be sufficient current to detect an overcurrent fault.

Tripping may be delayed hundreds of milliseconds for sensitivity BBD determines broken bars using the relative magnitudes of the signals at the sideband frequencies caused by the broken bars, with respect to the signal magnitudes at the system frequency. This normalization allows the algorithm to identify rotor failures independent of the motor characteristics. This function provides the following features for motor monitoring and protection. When the selected parameter drops below the load control lower setting level for one second, the auxiliary relay assigned to LOADLOW will operate.

The auxiliary relay will reset when the parameter is above the lowerlevel setting for one second. You can use this feature to control the motor load within set limits. Synchronous Motor Protection and Starting Control The SEL provides two levels of field over- and undervoltage, field over- and undercurrent, and field resistance protection. Previous Page. Next Page. Related Manuals for Sel No related manuals. Slots A, B, and Z are base unit slots, each associated with a specific function.

Optional communications cards are available only for Slot C, an RTD card is available only for Slot D, ac voltage or ac voltages and differential current cards are available only on Slot E, and current cards are available for Slot Z. Page 3 Update the side-panel drawing with the drawing sticker provided in the option card kit. If necessary, replace the rear panel with the one applicable for the card and attach the terminal-marking label provided with the card to the rear-panel cover.

Also, contact SEL for an updated product serial number label with the updated part number.