Applying The Function Parameter Settings - Siemens siprotec 7SA6 User Manual

Distance protection

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Pickup Modes

Applying the Function Parameter Settings

is cut off by the overcurrent stage Iϕ> also comes into effect. The bold dots mark the

settings which determine the geometry of the current/voltage characteristic. The

angle-dependent area which is shaded dark grey within the short-circuit angle area

can either have an effect in forward direction (in direction of line) or in both directions

U/I/ϕ characteristic

Loop pick-up will drop off if the signal falls below 95 % of the respective current value

or exceeds 105 % of the respective voltage value. A hysteresis of 5° applies to phase-

angle measuring.

As the U/I/ϕ fault detection represents an extension of the U/I fault detection according

to Section 6.2.2.2 the same program options apply. Tables 6-3 to 6-6 also apply for

single–phase pick-up.

Depending on the ordered version, the 7SA6 distance protection has a series of pick-

up modes from which the one matching the respective network conditions best can be

selected (also see order data in the Appendix).

If the device does not have an explicit pick-up function or, if you set ',6 $15 =

,PSHGDQFH (address ) for pick-up type when configuring the protection

functions (Section 5.1), all settings dealt with in this section are irrelevant and cannot

be selected.

Available pick-up modes are described in Section 6.2.2.1 and 6.2.2.2 in detail. If the

device has several alternative pick-up modes, one option has been selected when

configuring in address (see Section 5.1). Below, parameters are given and

discussed for all pick-up modes. With the following settings, only those parameters will

appear that apply for the selected pick-up mode.

Short-circuit angle

Short-circuit

C53000-G1176-C133-1

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