Overcurrent fault detector for underground lines
Contents
1. the overcurrent is declared as being a fault applicable to the earth faults and phase faults RL delay Delay associated 0 50 90 140 0 s Waiting time between activation of the indicator light with remote operation and remote operation contact changeover contact changeover This delay is intended to filter transient faults eliminated by the reset cycles before their indication to remote operation Rearm Auto Signalling duration 1 2 4 8 16 24 36 96 2 h Duration above which the detector automatically switches to standby status after the appearance of the indicator light and in the absence of other conditions Rearm Ext Return to standby Activated Inhibited Inhibited The external input 1 of the detector is intended to receive status by external an external contact in order to return the detector input changeover to standby status Available as option Rearm Ubt Return to standby Activated Inhibited Activated Available on the detector with auxiliary power supply status by the presence of auxiliary voltage Rearm Return to standby Activated Inhibited Inhibited status by presence of current on MV grid Inrush Filtering of inrush Activated Inhibited Inhibited The detector is able to filter the inrush currents so that current they are not considered as faults This option cannot be activated if the Rearm Ext Rearm Ubt and Rearm parameters are all inhibited or if the Validation parameter is less than 202. to be consulted using buttons Q and Q The pushbutton serves no purpose m MODIFication submenu this allows the parameters to be changed This submenu is accessed by prolonged pressing on the pushbutton In the Modification submenu the operator can m Scroll through the parameters using buttons Q and m Change the displayed parameters using the pushbutton the current parameter value starts to flash The operator selects a new value from the possible values using pushbuttons and then validates the new value using pushbutton A confirmation is requested to do this pushbuttons and are used to select Yes then the operator validates confirmation using the pushbutton Title Possible values Factory Unit Additional information 3lo Zero sequence 5 10 15 20 25 30 40 80 A Special value shown by disables earth fault Threshold 1 threshold 1 50 60 70 80 100 120 detection 3lo threshold 1 is the standard threshold 140 160 180 xxx 3lo Zero sequence 5 10 15 20 25 30 40 xxx A Special value shown by xxx disables earth fault Threshold 2 threshold 2 50 60 70 80 100 120 detection 3lo Threshold 2 is available as option 140 160 180 xxx Imax Phase threshold 225 450 630 700 450 A Special value shown by Xxx disables phase fault detection Validation Fault validation period 60 100 200 300 360 300 ms Duration above which
3. 0 ms Light 1 Type of external lights Fixed Pulsating Fixed The detector can be connected to two types of indicator installed lights fixed type as standard or pulsating type in some cases Contrast Adjustment of the 1 0 1 0 The display contrast can be adapted to the conditions display contrast of use 6 NT00302 EN 01 Schneider Electric DAX NT00302 EN 01 User s guide Tests After prolonged pressing on the Rearm Test pushbutton the DAX detector starts a test This test involves activating the remote operation dry contacts and the internal and external indicator lights Activation of the dry contacts and the indicator lights stops as soon as the Rearm Test pushbutton is pressed or after one minute Rearming modes When the detector is in the fault signalling phase it is rearmed returned to standby mode by the first activated condition from the following m Pressing on the Rearm Test pushbutton m The end of the signalling period Rearm Auto g Switching of external contact input 1 Rearm Ext for the version equipped with this contact m Presence of auxiliary voltage Rearm Ubt for the LV battery version m Current present in the CTs Rearm I Maintenance Small battery life more than 8 years and 700 hours signalling Replacement of the large battery every 5 years with 250 hours signalling Schneider 7 Electric Schneider Electric Industries SAS Schn
4. MV electrical network management DAX Overcurrent fault detector for underground lines Installer and user manual Schneider DAX When carrying out any work on a DAX detector with an auxiliary power supply disconnect the power 2 Schneider Electric DE55370 DE55368 Presentation The DAX is an overcurrent fault detector for use on underground or underground and overhead MV networks It complies with Electricit R seau Distribution France ERDF specification HN 45 S 50 of October 1981 Supply On delivery check that the received equipment complies with the following supply list m The DAX detector consisting of a box containing the electronic board and a battery m One or three CTs and a connecting cable m One or two indicator lights for external installation m The installer and user manual The battery is m AAtype small for a detector with auxiliary power supply m D type large for a stand alone detector Mounting The DAX box is mounted without removing the cover with four countersunk head screws of dia 5 x 60 mm Leave an access zone of 40 mm around the DAX box to allow opening and clearance for the cover Dimensions Box opening To open the box press slightly on either side of the lower part of the cover Then raise the cover DES5367 Access zone Electronic board architecture Programming connector Display 000o Reset pushbutton Large battery
5. connector A Small battery AA OT E Large battery D Screw on terminals O Supply disconnector c _ Fuse Spare fuse in plastic box NT00302 EN 01 DE55369 DE55365 DAX i i Fault MV MV 3 CTs underground installation of DAX network MV cubicle MV cable earth braid Cubicle earth collector A CAUTION Pass the MV cable earth braid inside the CT NT00302 EN 01 DE55371 Commissioning CT connection Install the three CTs around the MV cables in compliance with the positioning direction green side towards the busbar and red side towards the grid Connect the green yellow wire of each CT secondary winding to the MV switchboard earth terminal and plug the two pin connector of the CT secondary winding to the connector at the end of the current input cable termination Pass the current input cable through a detector cable gland and connect the cable termination to the four screw on terminals see cable diagram Connection of external indicator lights 2 9 Pass the indicator light cable through a detector cable gland and connect the cable termination to the two screw on terminals see cable diagram Connect the other end of the cable to the indicator light Make sure that the correct poles are connected 2 S 9 Perform the same operation for the
6. eider Electric Telecontrol 839 Chemin des Batterses Z I Ouest 01700 St Maurice de Beynost T l 33 0 4 78 55 13 13 Fax 33 0 4 78 55 50 00 http www schneider electric com E mail telecontrol schneider electric com NT00302 EN 01 As standards specifications and designs change from time to time please ask for confirmation of the information given in this publication Publishing Schneider Electric Industries SAS Production Graph me YX This document has been Printing Made in France 9 printed on recycled paper 01 2012 Schneider Electric Industries SAS All rights reserved
7. en displays the current version of the software and if appropriate the fault currently indicated followed by the main menu Main menu The DAX detector presents two options in the main menu m INFOrmation menu this displays the detected alarms and fault meters m PARAMetering menu this allows the parameters to be consulted and or changed The operator can m Select a menu using the pushbuttons and Q m Validate selection using the pushbutton Information menu The INFO menu allows display of m f applicable the currently indicated fault o earth fault associated with 3lo Threshold 1 o earth fault sequence associated with 3lo Threshold 2 o phase fault associated with Imax threshold m Meter number of validated faults overcurrent lasting longer than the validation period m Period gt 40 ms number of unvalidated faults overcurrent lasting longer than 40 ms but shorter than the validation period The operator can m Consult this information using buttons and m Reset the meters by prolonged pressing on the pushbutton when displaying a meter Confirmation is requested To do this pushbuttons and allow the Yes option to be selected then the operator validates confirmation using the pushbutton Electric Schneider 5 DAX Description User s guide Parameters Setup menu The PARAM menu is used to consult and or change the parameters in the following table m READ submenu this allows the parameters
8. r s guide section Schneider 3 Electric DAX Commissioning Wiring diagram of the DAX detector Currents External inputs DE55372EN S1 Single CT mounting 1 2200 Light 1 Light 2 Remote control 2 Remote control 1 Mains 42 24 tet 28 ELA Fed I li 1 ji 2 Normally Normally Three CTs open 4 open i mounting Normally Normally Remote operation 1 2200 Common closed Common closed Light Light External input 1 2 Changing the fuse There is a spare fuse in the lower part of the DAX box base Its references are as follows dimensions 5 x 20 In 250 mA fast acting Changing the battery The battery must be replaced if defective In the case of a stand alone detector with a large battery the securing collar has to be cut and changed When replacing the battery the operating parameters and the meter values are stored in memory PE58780p Box closure To close the box first insert the lugs on the upper part of the cover in the base Close the cover down over the base until completely blocked A lead seal can be placed on the lower part of the box Spare parts Sealings Contact our after sales service 4 Schneider NT00302 EN 01 Electric PE58781 DAX 3lo Threshold 1 or Imax fault 3lo Threshold 2 fault optional NT00302 EN 01 Display Auxiliary supply light Standby Navigation Validation Te
9. second indicator light optional Connection of the remote operation cable a Pass the remote operation cable through a detector cable gland and connect the cable termination to the three screw on terminals see cable diagram ee Perform the same operation for the second remote operation channel optional Connection of the external input cable Ea Pass the external input cable through a detector cable gland and connect the cable termination to the two screw on terminals see cable diagram The second external input is not used in this product Battery installation When using a detector with a small battery install the battery in its support while ensuring that the correct poles are connected The DAX detector starts When using the stand alone detector with a large battery plug the battery connector into the board The DAX detector starts Connection of the auxiliary supply A Check that the supply cable does not enter the box through the grey shaded area shown below or behind the box Pass the supply cable through the detector cable gland and connect 150 the cable termination to the two screw on terminals see cabling diagram Make the supply circuit ae i 1S0 The internal red light shown as a sinusoidal signal comes on le Configuration The DAX detector can be configured using the display and the pushbuttons Parameters Setup menu More details on parameter changes are given in the Use
10. st Pushbuttons _J On light User s guide The DAX detector is activated as soon as the lithium battery is connected The detector displays the current version of the software followed by the main menu Man Machine Interface MMI The MMI consists of m An LCD display presents the menus parameters values and messages on a 16 character display m Four pushbuttons O one pushbutton for setting the detector to standby rearming or starting the test mode on prolonged pressing o two pushbuttons and for navigating in the menus and scrolling through the parameter values o one pushbutton Qi validating a selection or an input value m Two to four internal indicator lights O agreen light which comes on periodically to indicate that the detector is operating o a red light to indicate the presence of an auxiliary supply o a flashing yellow light to indicate detected faults associated with the thresholds 3lo Threshold 1 or Imax O asecond flashing yellow light to indicate detected faults associated with threshold 3lo Threshold 2 optional m One or two external lights These are connected and supplied by the DAX box and allow signalling of faults outside the substation the second is optional these two lights are linked to the two internal yellow lights In the absence of pushbutton operation the display switches off automatically after a certain period of time It can be started by pressing any pushbutton it th
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