ABB THF 1BS Series Installation And Operation Instruction Manual Download

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The installation shall be done following the local wiring rules suggesting to work all
power off. Prior to installation of THF on PEN

−

conductor between point A and B

following measures must be taken.

Installation to TN-C-S-System

THF in the transformer star point -
Recommended connecting point

•

In PEN- conductor in transformer

star point: Care should be taken to

ensure that no earth/neutral bond exists
on the supply (transformer) side of the
ﬁlter. This may result in a bypass
situation causing excessive current
to ﬂow via the system earth.

Follow the rules described in this
instruction- capitel TN-C-system.

Summary of Contents for THF 1BS Series

Page 1: ...or in transformer star point Care should be taken to ensure that no earth neutral bond exists on the supply transformer side of the ﬁlter This may result in a bypass situation causing excessive current to ﬂow via the system earth In case of installation in N conductor of TN S system Prior to installation of THF resistance measurements must be carried out between the downstream building earth neutr...

Page 2: ...op to protect THF against overload The function of the protection unit The protection unit controls the by pass contactor K1 in case the 50 60Hz or 150 180Hz current exceeds the set level The factory settings 150 180 Hz current 7 of the rated primary current of current transformer T1 This current can cause overheating in case of fault in the TN S system Time settings 0 5 sec 50 60Hz current exceed...

Page 3: ...F 4 Measure the isolation resistance between pointA and B to ensure that the resistance between point A and B is high Re needs to be over 50 kΩ Any earthing conductor with lower resistance by passing the THF between the star point and B might be subject to high third harmonic current which can cause heating of the cables 5 Make the earthing in point B The installation of THF 6 Before the installat...

Page 4: ... be carried out between the downstream building earth neutral to ensure that no erroneous earth neutral connection exists other than that intended to achieve a TN S system Such accidental connection could cause excessive current to ﬂow in the system earth and heating of the cables The installation of THF in the N conductor 6 Before the installation turn the by pass switch of THF unit ON 7 Connect ...

Page 5: ...cal wiring rules suggesting to work all power off Prior to installation of THF in the transformer star point between point A and B following measures must be taken 1 Measure the fundamental 50 60Hz current in the star point connector conductor Load balancing is recommended if the unbalance current exceeds 15 of the rated primary current of the CT The installation of THF in the PEN conductor 6 Befo...

Page 6: ...Installation to TN C S System THF in the transformer star point Recommended connecting point In PEN conductor in transformer star point Care should be taken to ensure that no earth neutral bond exists on the supply transformer side of the ﬁlter This may result in a bypass situation causing excessive current to ﬂow via the system earth Follow the rules described in this instruction capitel TN C sys...

Page 7: ... Prior to installation of THF in N conductor of one of the TN S parts resistance measurements must be carried out between the downstream building earth neutral to ensure that no erroneous earth neutral connection exists other than that intended to achieve a TN S system Such accidental connection could cause excessive current to ﬂow in the system earth and overheating of cables The procedure is the...

Page 8: ...rocedure see table in page 9 If the indicator lights are according to the table in page 9 the protection unit is working correctly and the THF ﬁlter can be switched on the network Current transformer KORE06F1600 1THF Relay settings as factory settings in the above table K4 relay setting 5 gives 50 60 Hz max current 300A K5 relay setting 1 gives 150 180 Hz max current 50A The reaction time 0 5 0 7 ...

Page 9: ... The indicator light functions 3 Resetting of a protective unit 4 The indicator light functions in Test actions 1 Find out the reason why a protective unit has been activated and correct the fault The reason for an unbalance current may be a blown fuse in main circuit 2 Check by Test action that a protective unit is working properly 3 Push Reset button If the protective unit is activated again the...

Page 10: ...10 10 0 8Nm M4 1 2Nm ...

Page 11: ...11 0 8Nm M4 1 2Nm ...

Page 12: ...THF 1BS_ THF 1S_ ABB Oy P O Box 622 Telephone 358 10 224 000 FIN 65101Vaasa Telefax 358 10 224 5708 Finland Low Voltage Products Teki Prepared 04 11 17 K Kimpimäki Tarkasti Checked Hyväksyi Approved ...

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ABB THF 1BS Series, Installation And Operation Instruction Manual

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