4.7
STDE residual magnetization removal module (code PII27175)
This option allows neutralizing the residual magnetization of the power transformer core after the winding resistance
test. The connection to STS is mandatory.
The following image exhibits the STDE option:
Figure 19 - STDE option
The principle of the option is to apply a DC voltage with alternate polarity to the transformer winding, following the
IEEE 62-1995 standard.
The following table lists the STDE main characteristics:
Characteristic
Note
Generator
Constant current, voltage limited
Maximum test current
7 A DC
Maximum test voltage
70 V DC
Current resolution
7 mA
Output current stability
Better than 0.5% of the rated value
Case
Plastic case with handle
Connections
•
Connection to the STS control connector
•
Two sockets to the STS DC output
•
Two sockets to the transformer to be de-magnetized
Cables
•
No 1 interface connection cable to STCS, 2 m long
•
No 6 Cables, 2 m long, one red and one black, for the connection
to the STS
•
No. 2 Cables, 10 m long, for the STDE current output to the
device under test
Table 59 – STDE main characteristics
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