Applying The Function Parameter Settings - Siemens SIPROTEC 7SA6 Manual

Distance protection relay for all voltage levels

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Table of Contents

Pickup Modes

Applying the Function Parameter Settings

C53000-G1176-C156-2

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

gle-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 (set-

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 DIS ANR = Im-

pedance (address 114 ) for pick-up type when configuring the protection functions

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

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 114 (see Section 5.1). Below, parameters are given and dis-

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

appear that apply for the selected pick-up mode.

With the U/I(/ ϕ ) pick-up mode you have the option to determine the voltage measuring

and, if applicable, the phase-angle measuring for phase–to–earth measuring units,

Short-circuit angle

Short-circuit