Nortech F10 User Manual Download Page 8

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F10

Earth Fault Indicator

Page 8 of 16

3.3

Indication with DC reset signal

time

fault current

time

LED indication

and relay contacts

time

DC reset signal

Fault 1

Fault 2

Fault 3

In all cases RTU sends DC

reset signal as soon as F10

indication is detected. F10

resets within 1 second of

DC reset signal

Indications with DC reset connected

Summary of Contents for F10

Page 1: ... Nortech Management Ltd United Kingdom May 2013 www nortechonline co uk Doc ref D_000800 F10 Earth Fault Indicator USER MANUAL Version 1 2 ...

Page 2: ... for a particular purpose NML may make changes or improvements in the software equipment or specifications described in this document at any time and without notice These changes may be incorporated in new releases of this document This publication could contain technical inaccuracies or typographical errors NML shall not be liable for any damages including but not limited to consequential indirec...

Page 3: ...ples 7 3 1 Indication with no electrical reset 7 3 2 Indication with AC reset signal 7 3 3 Indication with DC reset signal 8 4 Installation 9 4 1 Physical 9 4 2 CT earthing 9 4 3 CT connections 10 4 4 Wiring connections 11 4 5 Enclosure Mounting 12 5 Maintenance 13 5 1 Technical Assistance 13 5 2 Simple Test 13 5 3 Primary Injection 13 5 4 Replace battery 13 5 5 Recycling 13 6 Specification 14 6 1...

Page 4: ...s given by a flashing LED for a pre set time period At the same time the relay contacts operate giving an electrical remote alarm On completion of the time period the unit will automatically self reset and is then ready to detect subsequent faults The F10 may also be manually reset remotely reset via a telecontrol DC reset signal or on restoration of AC supplies The F10 indicator is available for ...

Page 5: ... the indication period by pressing the RESET button on the front of the F10 Once the button is released the F10 will be reset to the ready state Electrical The F10 may be reset early at any time during the indication period by either a DC pulse from a telecontrol RTU or on restoration of a local AC supply 2 4 Current Transformers The CT combination to be used is a factory option check with Nortech...

Page 6: ...ressed the LED will flash however the output contacts will not operate This simple test proves the processor LED test button and battery are healthy It does not test the integrity of the CT connections or output contacts A primary injection into the CT arrangement is the best local test available Nortech supply a portable battery powered test set for this purpose ...

Page 7: ...e network 3 1 Indication with no electrical reset time fault current time LED indication and relay contacts 3 hours 3 hours Fault 1 Fault 2 Fault 3 Unit starts indication for fault 1 Fault 2 not detected as already indicating Reset at end of 3 hour timer Indications with timer reset only 3 2 Indication with AC reset signal time fault current time LED indication and relay contacts time AC supply st...

Page 8: ...ation with DC reset signal time fault current time LED indication and relay contacts time DC reset signal Fault 1 Fault 2 Fault 3 In all cases RTU sends DC reset signal as soon as F10 indication is detected F10 resets within 1 second of DC reset signal Indications with DC reset connected ...

Page 9: ...osition over the cable sheath or screening tape and in accordance with local safety regulations When an earth fault occurs in a cable network the majority of return current will flow through the cable sheath thus resulting in a null output from the core balance CT as shown in the figure below INCORRECT Earthing Incorrect Earthing This effect can be prevented if the cable earthing connection betwee...

Page 10: ... a factory set option Wire the summated output from the CT secondary s to the CT terminals of the F10 The current transformers should be connected as shown in the diagram it is important that the polarities are as shown Wire the output from the CT secondary to the CT terminals of the F10 3 phase CT connections Single core balanced CT connection ...

Page 11: ...ESET AC DC COM Battery Battery If it is not already connected the battery should be plugged in CT connections Connect CT secondary output to terminals 1 2 Output contacts Alarm Circuit between terminals 3 4 is normally closed and will open when the F10 is indicating Circuit between terminals 4 5 is normally open and will close when the F10 is indicating Remote reset Apply 110V 230V ac between term...

Page 12: ...ing holes suitable for use mounting the F10 on a wall or switchgear bracket Enclosure drillings and cable entry glands can be provided if required Mounting brackets are available from Nortech on request Rear view of F10 enclosure 80 0mm 82 0mm 70 0mm 50 0mm 4 off Mounting holes Side view of F10 LED 55 0mm F10 enclosure fixing holes ...

Page 13: ...ed For core balanced CTs mounted external to the switchgear Nortech manufacture a Test Set which can be used for this purpose For phase CTs mounted internal to the switchgear it is often considered unnecessary to retest the CT wiring to the F10 5 4 Replace battery The battery will provide up to 20 years life and 1000 hours of flashing indication subject to environmental conditions When replacement...

Page 14: ... 6 2 EMC The F10 indicator has been designed and tested for compliance accordance with the high level standard 61326 1 2006 The class tested to was Industrial Immunity ESD IEC61000 4 2 4kV contact 8kV air EM Field IEC61000 4 3 10V m 80MHz 1GHz 3V m 1GHz 2GHz 3V m 2 0GHz 2 7GHz Power Freq Mag Field IEC61000 4 8 Not Applicable Power and I O Signal Lines Burst Fast Transient IEC61000 4 4 Not Applicab...

Page 15: ...C Storage In addition to the above environmental considerations the F10 should be stored in an environment that is dry corrosive free and not in direct sunlight Correct storage Prevents premature component failures caused by environmental factors such as moisture or corrosive gases Exposure to high humidity or corrosive environments will prematurely degrade the electronic components in any electro...

Page 16: ...uit crush dissemble or heat above 100 C incinerate or expose contents to water LEDs Warning the EFI element LEDs are very bright Do not look directly at the LEDs AC Reset only where connected by user Isolate from mains before removing cover 100 240V AC 50 60Hz 100mA rated current Disposal Battery and F10 unit should be disposed of in accordance with local regulations ...

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