46
impedance angle
（
sensitivity angle
）
is generally 90 degrees or 80 degrees . Two ways
optional, the program automatically translated. Generally protection only has three sections,
enter the setting values to a fixed value of the column during the test. If without the fourth
setting , do set it , at the same time in the [ Test Project ] column do not select
Ⅳ
.
3. [ Fault type ]
The type of fault can be divided to: AN, BN, CN, AB, BC, CA and ABC. Users can single
choice, multiple choices or select all. If you want measured all the projects all at once, the
type of fault can be all selected, input value is elected to the triple jump contacts of protect.
4. [ Fault set ]
[Time before fault]: should be more than the reset time of the device, generally 20
seconds.
[Fault time]: should be more than the action time of the fourth stage impedance,
generally 4-5 seconds.
[Zero sequence compensation factor]: single phase ground, only enter imaginary part,
generally 0.67.
[Segment I short-circuit current]: generally I segment impedance is relatively low, in order
to elevate the short-circuit voltage, should set the short-circuit current larger, typically 10A.
[Segment II short circuit current]: segment II impedance is moderate, so the short-circuit
current is set to a medium value, generally 5A.
[Segment
Ⅲ
short circuit current ]
[segment
Ⅳ
short circuit current]:
Ⅲ
and
Ⅳ
segment Impedance generally relatively large,
in order to reduce the short-circuit voltage ,
short-circuit current should be set lower ,
generally 2A or 3A.
For the distance protection of 500KV
voltage level, due to the secondary rated
current of the current transformer is 1A, the
Summary of Contents for HT-802
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