Toshiba GR200 Series Instruction Manual page 141

Line differential protection ied

Hide thumbs Also See for GR200 Series:

Table of Contents

The PSB operation is permitted when phase-overcurrent elements (OCCR) are operating.

The thresholds of OCCR elements are defined with VCT rated current multiplied by 0.08 (i.e.,

secondary rated 1A×0.08 or 5A×0.08).

a. PSBSIN and PSBSOUT in ZS

Figure 2.10-25 Example of PSB element characteristic

The setting of PSBSIN adjusts automatically so that the PSBS operates properly in

accordance with the operation of ZS. The shaded area formed by the rectangle, which is

tangential with the elements (circles) in both directions of ZS, determines the size of PSBSIN.

For example, in Figure 2.10-25, Z2S is the most distant measuring element in the forward

direction; Z3S is the most distant measuring element in reverse direction; the top line of the

PSBSIN function is similar to the tangent of Z2S, the bottom line of the PSBSIN function is

similar to the tangent of Z3S. The outer element PSBSOUT encloses the inner element

PSBSIN with a width which can be set using the setting [PSBSZ].

Figure 2.10-25 illustrates the ZS elements are separately placed in the forward and

reverse directions. If all ZS elements are placed in one direction (in other words, elements are

not placed in the forward and the reverse), the inner and outer are constructed with the ZS

element and the other symmetrical element (see Figure 2.10-26). The symmetrical element is

as large as the largest ZS element; the symmetrical one will be placed by pivoting the largest

one around the origin.

6F2S1914 (0.49)

b. PSBGIN and PSBGOUT in ZG

GRL200 (Soft 033 & 037)

Chapters

Table of Contents