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Section 11 Impedance Test
This program is used for the impedance setting calibration of the three-stage or
four-stage distance protection. Generally the substations which more than of 110KV voltage
levels equip with distance protection device.
1. [ Inter-phase setting ]
Inter-phase impedance short - circuit setting, the program set to four stages, i.e., Z1, Z2,
Z3 and Z4. According to the Z / φ to input, or R, X – mode, the protect value is generally
represented by a net resistance, the resistance component can be negligible, so the
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
.
2. [ Grounding setting ]
Single phase impedance short - circuit setting, the program set to four stages, i.e., Z1, Z2,
Z3 and Z4. According to the Z / φ to input, or R, X – mode, the protect value is generally
represented by a net resistance, the resistance component can be negligible, so the
Summary of Contents for HT-802
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