Post on 26-Dec-2021
Brochure THF 1 GB 99-031SCC330001C0201
Enclosed Third Harmonic FilterTHF Complete Sotutions
Low Voltage Products
2 Low Voltage Products
The Third Harmonic - a Growing Problem
Today's electrical networks and plants are undermuch more stress than a decade ago. One reasonfor this is the increasing use of electric equipmentwhich generate harmonics: in particular the thirdharmonic.
This harmonic can generate exceptionally highneutral currents which can often exceed even thephase current.
Equipment that generate harmonics:
• Fluorescent lighting systems• Computers• Welding equipment• UPS• Rectifiers• TV monitors• Microwave ovens
The Third Harmonic Causes Many Problems
Problems are directly related to the harmonic content. The third harmonic found in the phase current appearsneutral thus increasing the neutral current. See illustration on the next page.
In network:
• Overheating• Increased power losses• Poor quality of electricity• Electromagnetic fields• Malfunctions in earth fault control• Failure in remote control systems
In plants:
• Malfunction in electronics• Damage to capacitors• Power losses• Increased magnetic fields• Overload in neutral conductor• Cable fires• Abnormal temperature changes and noise in
transformers• Nuisance tripping in circuit-breakers
UPS
S01
057A
Low Voltage Products 3
1,00 0,40 0,00
-0,40
-1,00
L1
3.L1
1,00 0,40 0,00
-0,40
-1,00
L2
3.L2
1,00 0,40 0,00
-0,40
-1,00
L3
3.L3
N
1,00 0,00
-1,00
1,00
0,00
-1,00
L1L2L3
S00
248A
0,00 30 60 90 120
150
180
210
240
270
300
330
0,00 30 60 90 120
150
180
210
240
270
300
330
0,00 30 60 90 120
150
180
210
240
270
300
330
0,00 30 60 90 120
150
180
210
240
270
300
330
0,00 30 60 90 120
150
180
210
240
270
300
330
The Solution - The Third Harmonic Filter
The third harmonics are accumulated in the neutralconductor.
ABB Control Oy has developed a filter designed toeliminate the third harmonic.During the development process, there were manyindications proving that the third harmonic had anegative effect on the network.Once the filter is installed, machine interruptionsdecrease and process reliability improves.The filter also eliminates the harmonic in phaseconductors and power consumption is smaller.
The operation principle of THF is to convert theharmonic current into harmonic voltage, whichappear between phase and neutral. In TNS-systemit also appears between neutral and earth.
L1
L2
L3
N
PE
TNS
S00
250A
THF patented
application
• Increased efficiency in low voltagenetwork- Reduction in transmission losses- Increased loadability of the existing network
and switchboards- Lower temperature of cables, switchboards
and transformers- Elimination of third harmonic current in neutral
and phase conductor
• Increased efficiency in lightingappliance and pc-load- Less power or more lighting- Less maintenance- Longer life time of the lamps and capacitors
• More reliability in system- Reduced temperature of network devices- Increased maintenance intervals- Longer lifetime of the network
• Reduced Magnetic fields- The reduction of third harmonic component of
the current reduces the total magnetic field.- Picture example of the total magnetic field
spectrum typically in various locations.
Benefits of THF for lightingsystems and officebuildings
3,5
3
2,5
2
3,5
1
0,5
0Without THF With THF
Low Voltage Products 5
Contents:
Third harmonic filter THF for transformer circuit in TNC and TNS-systems
• Installation of THF filter ............................................................................................. 6
• Selection of THF filter ................................................................................................ 7
• Protection unit ........................................................................................................... 8
• Ordering information .................................................................................................. 9
• Dimension drawing .................................................................................................... 9
Third harmonic filter THF for distribution boards in the TNS-system ...................... 11 - 15
Third Harmonic Filter THFFor Transformer Circuitin TNC and TNS-systems
6 Low Voltage Products
TNS system
In TNS system it is advisable to install THF in transformer starpoint, see above.
It can be also installed in the neutral conductor, however the network must be a pure TNS-system. See "Third harmonic filter for distribution boards", pages 11...15.
TNC systemIn TNC system the THF filter is installed in the transformer star point. There must be noearthing between the starpoint of transformer and incoming terminal of THF filter.
Because of earthcurrent, THF filters
cannot be installed inthe PEN conductor of afour-conductor system.
Installation of THF filters in transformer circuitsin TNC and TNS-system
PENTHF
L1
L2L3
PEN
L1
L2L3
THF
S01
059A
Correct installation
Incorrect installation
PENTHF
L1
L2
L3
S01
065A
Incorrect installation
Earthing is allowedonly after THF filter.
Low Voltage Products 7
The basis of dimensioning: The maximal asymmetrical current in N-conductor is 50 % of the rated current
THF filter is installed in the starpoint of the transformer. Type MJSTHF for outdoor andtype MNSTHF if for indoor use.
Transformer size Type Number ofSn/kVA In / A (400V) designation cubicles Use
315 460 MJS THF315B1 1 Outdoor useMNS THF315B1 1 Indoor use
500 720 MJS THF500B1 2 Outdoor use
MNS THF500B1 1 Indoor use
630 900 MJS THF630B1 2 Outdoor useMNS THF630B1 1 Indoor use
800 1150 MJS THF800B1 2 Outdoor use
MNS THF800B1 1 Indoor use
1000 1450 MJS THF1000B1 2 Outdoor useMNS THF1000B1 2 Indoor use
1250 1800 MJS THF1250B1 3 Outdoor useMNS THF1250B1 2 Indoor use
1600 2300 MJS THF1600B1 3 Outdoor use
MNS THF1600B1 2 Indoor use
2000 2900 MJS THF2000B1 4 Outdoor useMNS THF2000B1 3 Indoor use
Selection of THF filters for transformer circuit inTNC and TNS -system
MJSTHF
MNSTHF
The MJSTHF and MNSTHF filter deliveryinclude protection unit (THF 1 S), by-pass-contactor and manual by pass switch.More information of the protection unit, seenext page.See ordering information in page 9.
8 Low Voltage Products
THF I >K1
PEN
PEN
S00
985A
Test
I
O
230 VACN
PE3 X 1,5 mm2
PEN
10 A
N
PE
MAINDISTRIBUTIONBOARD
INPUT OUTPUTTRANSFORMER
L1 L2 L3N
THF( THFMNS )( THFMJS )
THF1S
PEN
PEN
S01
061A
N(PE)
THF filter in TNC- or TNS -system installed inthe transformer starpoint and equipped with aprotection unit.
THF
Strömberg Test
OKByPass
Test
RReset
0
12090
6030
50/60Hz Error
50/60Hz150/180Hz Error
150/180Hz
Aut
o
S01
068A
By-pass of the THF-filter with the by-passcontactor controlled by protection unit.
Protectionunit
Protection unit, includes the filter delivery
The protection unit is always used in TNC and TNS circuits when the THFfilter is installed in the transformer star point. The unit can also be used inTNS circuits when the THF filter is installed in the neutral conductor, see"Third harmonic filter for distribution boards", pages 11...15.
The protection unit is used to protect the THF filter in main circuits in TNC-system against 50 Hz fundamental unbalance currents and 150 Hz over-currents.
The purpose of a protection unit is• to limit a 50 Hz fundamental unbalance voltage drop to desired level• to prevent overload of THF filter• to go to by-pass state in case of network or internal failure.
The THF filter types THFMNS and THFMJS include the complete delivery ofthe protection unit with the by-pass contactor. More information for protectionunit THF 1_S , see brochure THF 2 GB.
Low Voltage Products 9
Third Harmonic FilterTechnical Data, Dimension DrawingsOrdering Information
MJSTHF
MNSTHF
620600
2260
S01
066A
MNS THF
MJS THF
12
00
10
00
1050360
MJST2K
..
..
8
1020
280
Third harmonic filter in cubicles with protection unit for transformer circuit
For indoor use, include protection unit, by-pass contactor and manual by-pass switchCable entry from bottom. Option: cable entry from top, please change in type code B to T.For example: MNSTHF 315T1.
Transformer Number of Enclosure Type Order number Weightsize /kVA cubicles [kg]
200 1 IP 30 MNSTHF200B1 1SCA022542R0360 300315 1 IP 30 MNSTHF315B1 1SCA022575R5110 350500 1 IP 30 MNSTHF500B1 1SCA022575R4490 400630 1 IP 30 MNSTHF630B1 1SCA022575R4650 450800 1 IP 30 MNSTHF800B1 1SCA022476R7340 5001000 2 IP 30 MNSTHF1000B1 1SCA022575R4810 7501250 2 IP 30 MNSTHF1250B1 1SCA022537R1560 8001600 2 IP 30 MNSTHF1600B1 1SCA022531R2980 10002000 3 IP 30 MNSTHF2000B1 1SCA022575R4900 1300
For ourdoor use, include protection unit, by-pass contactor and manual by-pass switch
Transformer Number of Enclosure Type Order number Weightsize /kVA cubicles [kg]
315 1 IP 34 MJSTHF315B1 1SCA022580R2300 225500 2 IP 34 MJSTHF500B1 1SCA022580R2480 350630 2 IP 34 MJSTHF630B1 1SCA022580R2560 390800 2 IP 34 MJSTHF800B1 1SCA022580R2640 4601000 2 IP 34 MJSTHF1000B1 1SCA022580R2720 5201250 3 IP 34 MJSTHF1250B1 1SCA022580R2810 6701600 3 IP 34 MJSTHF1600B1 1SCA022580R2990 8502000 4 IP 34 MJSTHF2000B1 1SCA022580R3020 1010
Dimension Drawings
The dimensions are for one cubicle. For total width of THF filter, multiply the width by number ofcubicles.
Low Voltage Products 11
Contents:
Third harmonic filter THF for distribution boards in the TNS-system
• Installation of THF filter ........................................................................................... 12
• Selection of filter ...................................................................................................... 12
• Guard unit ................................................................................................................ 13
• Connection examples .............................................................................................. 14
• Ordering information ................................................................................................ 15
Third harmonic filter THF for transformer circuits ....................................................... 5 - 9
Third Harmonic Filter THFFor Distribution Boardsin the TNS-system
12 Low Voltage Products
The THF filter is installed in the neutral conductor. A filter is sized according to the distribution board or the fuse,which is supplying the group. The basis of the factory dimensioning of the filter is the fact that a filter installed inthe neutral conductor bears, in addition to the 150 Hz current, a 50 Hz component which may reach 100 % ofthe phase current (fully asymmetrical load).
The basis of dimensioning: Fully asymmetrical load.
Selection of filter for distribution boards in the TNS system
Size of THF Recommended cable size of neutral conducto r
feeding Q uantity & Type Neutral Cables betweenfuse conductor connection box and filter
in-out Cross section[ A ] Cross section
25 1 x THF 25NV 6 mm2 -
63 1 x THF 63NV 16 mm2 -
125 1 x THF 125NV 35 mm2 -
160 1 x THF 160NV 50 mm2 -
200 1 x THF 160NV + 1 x THF 63N 70 mm2 16 mm2
250 1 x THF 125NLV + 1 x THF 125N 95 mm2 35 mm2
315 1 x THF 125NLV + 1 x THF 125N 95 mm2 35 mm 2 +
+ 1 x THF 63N 16 mm 2
400 1 x THF 125NLV + 2 x THF 125N 150 mm2 35 mm2
500 4 x THF 125N + THF 1BV1 185 mm2 35 mm2
630 5 x THF 125N + THF 63N + THF 1BV1 2 x 95 mm 2 35 mm2
800 6 x THF 125N + THF 1BV2 2 x 150 mm 2 35 mm2
NPE
THF
L1
L2L3
S01
060A
NPE
THF
L1
L2L3
Correct installation
Incorrect installation
When the THF filter isinstalled in the neutralconductor, there can´t
be any connectionsbetween N and PE in
the loadside.
TNS systemIn TNS system the THF filter can be installed in the neutral conductor. The network must be apure TNS system. Fault current monitoring is recommended. Before the installation, the stateof TNS-system shall be verified by measuring the isolation resistance in the poles where THFis to be installed.It is advisable to install THF filter in the transformer star point even in TNS-system. In thatcase there is no 150 Hz voltage between N and PE. See installation of THF filter fortransformer circuits page 6.
Installation of THF filter for distribution boards
See page 15, parallel connection of third harmonic filters, connection examples.
Low Voltage Products 13
The function is based on measuring the PE current in pure TNS -system. The factory setting value is in therange of 4...10A and can be adjusted with the monitoring relay.
Guard unit
THF in TNS-system equipped with a guard unit.Measuring in PE conductor.
L1L2L3
PEN
THF_NV
10A GUARD
S01
067A
L1L2L3PE
N
Load Load Load
Aut.
A %150Hz
ByPa
ss OK THF
1 3 5
2 4 6
13 21
14 22
Test
F1
Test
L1
I >t
1 3
2 4 R
Guard unit with bypass contactor in TNS- system
THF in TNS system with guard unit
The wiring diagram of guard unit
A THF filter shall be equipped with a fault current monitoring system, calleda guard unit, an economic way to improve the protection level of thenetwork in the TNS-system. Guard unit is used for supervising the networkcondition in TNS -systems.
The function is based on measuring the PE current. In case of the PEcurrent exceeding the set level (4...10A) the guard unit gives an alarm andcloses the bypass contactor of THF. The guard unit can be used with earthleakage systems. The guard unit do not substitute the earth leakageprotection, required in certain application. The earth leakage system do notsubstitute the guard unit.
• The guard unit is used for distribution boards in TNS circuits when theTHF filter is installed in the neutral conductor, see below, REMARK.
• The guard units are available either as inbuilt in the enclosed THF filter(types THF_ V) or inbuilt in the parallel connection box THF 1BV.The bypass contactor is included in above mentioned guard units.
• The guard unit is also available as a separate type THF 1V for remotemonitoring.
• The filter shall be dimensioned for full asymmetric load, see theprevious page.
THF
Strömberg
Test
Aut
OK
ByPass
Test
Reset
R
Test
Aut
OK
ByPass
Test
Reset
R
THF
S01
069A
L1L2L3
NPEN
THF THF1S
K1
10A
S01
062A
THF in TNS-system equipped with a protection unit.Measuring in PE and N conductors.
THF in TNS -system with protection unit
REMARKThe protection unit can be used instead of guard unit. It gives an additional protection against 50 Hzunbalance current. It also has selfsupervision. When the protection unit is ordered, the by-passcontactor and current transformer have to be ordered separately. Ordering information for protectionunit, see brochure THF 2GB.
14 Low Voltage Products
L1L2L3PE
N
Load Load Load
THF
THF_N
Basic Connection
L1L2L3PE
N
Load Load Load
Aut.
ByPa
ss OK THF
1 3 5
2 4 6
13 21
14 22Te
st
F110A
Test
L1
1 3
2 4
R
K2
S1 S2
K11
S2 21
22
6
78
I >t
910
43
2
1
A1
A2K1
A1
A2K11
5
S1
1
2
THF125NLVTHF1BV1THF1BV2
THF25NVTHF63NVTHF125NVTHF160NV
L1L2L3PE
N
Load Load Load
Aut.
ByPa
ss OK THF
1 3 5
2 4 6
13 21
14 22
Test
Test
L1
1 3
2 4
R
K2
S1 S2
K1
S2 21
22
6
78
I >t
910
43
2
1
S1
5
F110A
Aut.
Test
1 3
2 4
RS2 21
22
6 7
4 3 2
1
S1
5
L1L2L3PE
N
Load Load Load
Aut.
ByPa
ss OK
1 3 5
2 4 6
13 21
14 22
Test
Test
L1
1 3
2 4
R
K2
S1 S2
K1
S2 21
22
6
78
I >t
910
43
2
1
S1
5
F110A
1234567
1234567
THF 1V THF _NV
THF
XX
ByPa
ss OK
Test
7x1,5mm2
THF_NV +THF 1V
Connection examples
THF with guard unit
THF with guard unit and guard unit box for remote monitoring
Low Voltage Products 15
Third Harmonic FilterOrdering Information
THF
Strömberg
Test
Aut
OK
ByPass
Test
Reset
R
K
L
S
THF 63NV
THF
Strömberg
L
K
S
Test
Aut
OK
ByPassTest
Reset
R
175
250
100
X THF
34,5 Test
Aut
OK
ByPassTest
Reset
R
S00
641A
THF 1V
THF 1B
Connection example 1 Connection example 2
Connection example 3 Connection example 4
THF 125NLV THF 125N
THF 125N /THF 63N
THF 125N THF 125NLVTHF 125N THF 125N THF 125N THF 125N THF 125N THF 125N
THF 1BV2
THF 63NTHF 160NV
Enclosed third harmonic filter for TNS -systemOrdering information and technical data at ≤ 690V
Size of Connecting Dimensions Enclo- Type Order number Weightfeeding cable (Cu) (HxBxD) sure[A] [mm ] [kg]
Third harmonic filter with inbuild guard unit and bypass contactor (steel sheet enclosure)
25 6 400x250x180 IP 30 THF 25NV 1SCA022388R0700 19
63 16 600x400x230 IP 30 THF 63NV 1SCA022374R8260 43
125 35 1000x400x230 IP 30 THF 125NV 1SCA022374R8340 76
125 95 and 150 1400x400x230 IP 30 THF 125NLV 1SCA022378R6190 83
160 50 and 70 1000x800x230 IP 30 THF 160NV 1SCA022374R8420 110
Third harmonic filter without guard unit(can be used parallel with the THF_NV-types and with connection box THF1BV)(steel sheet enclosure)
63 16 600x400x230 IP 30 THF 63N 1SCA022325R0860 43
125 35 1000x400x230 IP 30 THF 125N 1SCA022325R1080 76
125 95 and 150 1400x400x230 IP 30 THF 125NL 1SCA022358R9010 83
160 50 and 70 1000x800x230 IP 30 THF 160N 1SCA022325R1240 110
Parallel connection box with guard unit and bypass contactor (steel sheet enclosure)
_ 185 400x800x230 IP 54 THF 1BV1 1SCA022383R7520_ 2 x (95…185) 400x800x230 IP 54 THF 1BV2 1SCA022383R7610
Guard unit box for remote monitoring (plastic enclosure)
1,5 250x175x100 IP 54 THF 1V 1SCA022374R8690
Parallel connection of third harmonic filtersTHF 125NLV includes space for parallel connection of several filters.
ABB OyLow Voltage ProductsP.O. Box 622FI-65101 VAASA, FinlandTelephone +358 10 11Telefax +358 10 22 45708http://www.abb.com/LVswitches
The technical data and dimensions are valid at thetime of printing. We reserve the right to subsequentalterations.
SYSTEMQUALITYCERTIFIEDSFS
ISO 9001
CERT
IFIED
ENVIRONMENTAL
SYSTEM
SFSISO 14001
ISO 9001 SFSBS 8800CER
TIFIED
OH
& S MANAGEMENT
-SYSTEM