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EXLIM T420-BH550

This surge arrester provides protection for switchgear, transformers and other equipment in high voltage systems against atmospheric and switching overvoltages.

Especially suitable for applications where:

–  The installation location is in an area with very high lightning intensity

–  Grounding or shielding conditions are poor or incomplete

–  The protected equipment is of especially importance

–  Energy requirements are very high (e.g. very long lines, capacitor protection)

 

The EXLIM T-B is an excellent choice when a porcelain housed surge arrester is required.

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General data
Unit
Neutral ground arrester
No
Family name
EXLIM
Type designation
T420-BH550
Design
MO, Gapless
Manufacturer country
Hitachi Energy, Sweden
Maximum system voltage (Us)

kVrms
550
Arrester classification as per IEC 60099-4 Ed. 3.0

Class
Station; SH
Nominal discharge current

kApeak
20
Rated voltage (Ur)

kVrms
420
Maximum continuous voltage (Uc)

kVrms
336
Frequency

Hz
15-62
TOV capability (after thermal energy rating Wth)
1s

kVrms
464
10s

kVrms
441
Charge, energy and current withstand data
Repetetive charge transfer rating Qrs

C
5,2
Thermal energy rating Wth

kJ/kV (Ur)
15
Discharge current withstand strength
High current, 4/10 μs

kApeak
150
Low current, 2000 μs

Apeak
2600
Single-impulse Single-impulse withstand rating (IEEE), Repetitive charge transfer test value (IEC) - sample tests on all manufactured block batches

C
6,2
Energy data as per previous IEC standard IEC 60099-4, Ed 2.2
Line discharge class

Class
5
Energy capability - thermal energy capability (as per IEC 60099-4 Ed 2.2, clause 8.5.5)

kJ/kV (Ur)
15
Guaranteed max. protective data
Maximum residual/discharge voltage with current wave 30/60 μs (slow-front/switching)
0.5 kA

kVpeak
786
1.0 kA

kVpeak
808
2.0 kA

kVpeak
831
Maximum residual/discharge voltage with current wave 8/20 μs (fast-front/lightning)
5.0 kA

kVpeak
888
10 kA

kVpeak
925
20 kA

kVpeak
999
Maximum residual/discharge voltage with current wave 1/(2-20) μs (FOW as per IEEE, steep front as per IEC) External inductive effects neglected
10 kA

kVpeak
990
Technical data for housing
Short-circuit capability
High current, 0.2 s

kArms
65
Low current

Arms
600
External insulation - Requirements as per IEC 60099-4
LIWL, 1.2/50 μs

kVpeak
1298
50 Hz, wet (60 s)

kVrms
623
SIWL, wet (250/2500 μs)

kVpeak
1038
External insulation - Sum of tested values on individual empty unit housing
LIWL, 1.2/50 μs

kVpeak
2505
50 Hz, wet (60 s)

kVrms
1212
SIWL, wet (250/2500 μs)

kVpeak
2002
Creepage distance (nominal)
mm

mm
14287
mm/kV (Us)

mm/kV (Us)
26
Creepage distance class
Heavy (25 mm/kV (Us))
Specified long-term load (SLL)

Nm
8000
Specified short-term load (SSL)

Nm
20000
Insulator colour/material
Brown Porcelain
Dimensions
12f
Mass (kg)
595
Amax (mm)
5763
B (mm)
2000
C (mm)
1000
D (mm)
1200
Shipping data
Unit
1-pack
Volume

kg
5,1
Gross

kg
805
2-pack
Volume

m3
7,9
Gross

kg
1500
3-pack
Volume

m3
7,9
Gross

kg
2105
6-pack
Volume

m3
7,9
Gross

kg
2105
Each crate contains a certain number of arrester units and accessories for assembly and erection. A packing list is attached externally on each crate. Each separate crate is numbered and the numbers of all crates and their contents are listed in the shipping specification. Hitachi Energy reserves the right to pack arresters in the most effective/economic combination. Alternate or non-standard crates may involve additional charges. The table above is to be seen as an approximation and specific data for deliveries may differ from the values given.