Seg WI Series User Manual

9.4.3
Test Windings, Test Sockets
CT Type Prim. Current Range Injected C–D
Test Current
Induced
Current
W2, WE2 16 … 56 A 1 A 50 A
W3 32 … 112 A 1 A 100 A
W4 64 … 224 A 1 A 200 A
W5 128 … 448 A 1 A 400 A
W6 256 … 896 A 1 A 800 A
The test windings transfer only a limited current range in a reliably linear magnetic
induction. There is a limit current, above which the induced secondary current does not
increase any further. As a consequence, it is not possible to perform a secondary test using
the test sockets if the pickup threshold is above this limit current.
These limit currents for the test sockets depend on the CT type. At SEG, the following values
have been measured.
CT Type
(see also ╚═▷ “WIC1 CTs”, ╚═▷ “3.3.2 Selection of a
WIC1-Compatible Current Transformer”)
Maximum Test
Current
[In
,min
]
Maximum Test
Current
as Injected C–
D Test Current
[A]
Maximum Test
Current as a
Primary Value
[A]
WE2 [16 – 56 A], Construction Type 1, WIC1-WE2AS1 17.5 5.6 280
W2 [16 – 56 A], Construction Type 1, WIC1-W2AS1 25 8.0 400
W3 [32 – 112 A], Construction Type 1, WIC1-W3AS1 17.5 5.6 560
W4 [64 – 224 A], Construction Type 1, WIC1-W4AS1 12.5 4 800
W5 [128 – 448 A], Construction Type 1, WIC1-W5AS1 4 1.28 512
WE2 [16 – 56 A], Construction Type 2, WIC1-CT2‑5P 22.5 7.2 360
W2 [16 – 56 A], Construction Type 2, WIC1-CT2‑10P 25 8.0 400
W3 [32 – 112 A], Construction Type 2, WIC1-CT3 20 6.4 640
W4 [64 – 224 A], Construction Type 2, WIC1-CT4 20 6.4 1280
W5 [128 – 448 A], Construction Type 2, WIC1-CT5 10 3.2 1280
228 WIC1 WIC1-1.0-EN-MAN
9 Technical Data
9.4.3 Test Windings, Test Sockets

Seg WI Series Specifications

General

Brand	Seg
Model	WI Series
Category	Relays
Language	English