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VT Guard Pro / VT Guard Pro-D

Solution for ferroresonance elimination

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Содержание VT Guard Pro

Страница 1: ...VT Guard Pro VT Guard Pro D Solution for ferroresonance elimination ...

Страница 2: ...en 2014 01 21 Scope of Contents 1 Description 2 2 Application and settings 2 3 Installation 5 4 Operating condition 7 5 Technical parameters 7 6 Dimensional drawing 8 7 Maintenance and service 8 8 Warranty 8 9 Disposal 9 ...

Страница 3: ...VT Guard Pro belongs to a new family of advanced protection devices which protect VTs against ferroresonant phenomena by proper and prompt damping action Fig 1 without creating excessive power consumption as in case of using ordinary damping resistors during normal operation of the network Two versions of the VT Guard Pro are available a VT Guard Pro b VT Guard Pro D Both versions are identical fr...

Страница 4: ...minal In case the earth fault protection device is already connected in open delta configuration the VT Guard Pro should be connected in parallel to such protection device Fig 2 Connection diagram of VT Guard Pro Factory default setting for the threshold voltage of VT Guard Pro effective voltage level when the device is activated is 20 V and time delay time between reach of threshold voltage and d...

Страница 5: ...s how to supply power to the diagnostic part described in Fig 4 and Fig 55 The earthed star point n1 n2 n3 has to be connected to the X2 1 terminal diagnostic part and earthed part of the open delta dn3 configuration to the terminal X1 2 functional part for the connection on Fig 4 Fig 4 Recommend connection of the diagnostic supply Fig 5 Recommend connection of the diagnostic supply ...

Страница 6: ... Pro should be fitted in low voltage compartment of the MV switchgear at the DIN TS 35 rail Fig 77 in vertical position at least 20 cm from other thermal sources Connection should be done according to the Fig 4 or Fig 55 by insulated wires minimum cross section should be 1 5 mm2 maximum 2 5 mm2 Max length of the connection wires up to 150 m Minimum temperature wires rating is 75 C The device shoul...

Страница 7: ...ts X3 1 closed in normal condition 230 V AC 220 V DC X3 2 Tab 1 Terminals position All of assembly work should be done after transformers disconnection from network It is forbidden to open VT Guard enclosure under voltage or with connected leads from the voltage transformers It is forbidden to do any manipulation or changes inside of the device except of jumper setting Fig Jumper setting to be don...

Страница 8: ...ith a new device 5 Technical parameters Device part Functional Rated operational voltage Ue 100 110 V AC Max operational current Iemax 10 A 0 2s Voltage range U 0 110 V AC Nominal frequency fn 50 60 Hz Time delay td 0 4 1 4 2 4 3 4 s Threshold voltage Ut 20 25 30 V Selfconsumption P 0 1 W Diagnostic Rated control supply voltage US 100 V3 100 3 V AC Voltage range U 33 110 V AC Nominal frequency fn ...

Страница 9: ...aned by brush or compressed air Other preventive maintenance is not needed Any repairs must be done only by authorized personnel Manufacturer does not take responsibility for improper device functioning in case of unauthorized servicing Choked gaps may cause failure of appliance 8 Warranty The manufacturer warranty is 24 months since the day of putting the apparatus into operation but not longer t...

Страница 10: ...152 602 420 547 152 604 Fax 420 547 152 626 E mail info ejf cz abb com http www abb com The data and ilustrations in this catalogue are not binding We reserve the right for making changes to the content in the course of technical development of the product 1VLM000651 Rev 3 en 2014 01 21 ...

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