ERL L-PRO 4000, Руководство пользователя

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7 Acceptance/Protection Function Test Guide
D02706R02.30 L-PRO 4000 User Manual 7-9
The multiplier used to compensate phase-to-ground impedances:
21N Reach Settings
Zone 1 Reach: Mho 4.72

Zone 2 Reach: Quadrilateral X: 7.38

, R: 6.00

Zone 3 Reach: Mho Forward 17.7

, Reverse 0.50

Zone 4 Reach: Mho Forward 0.00

, Reverse 4.72

Compensated 21N1 setting 4.72

(Zone 1 phase-to-ground compensated Mho
impedance):
where
Z
1
- Positive Sequence Impedance
Z
2
- Negative Sequence Impedance
K
0
- Factor
(6)
1 + K
0
= (1 + 0.57

-9.5

)
= (1 + 0.562 – j 0.094)
= (1.562 – j 0.094) = 1.569


3.5

(7)
(8)
K
0
Z
0
Z
1
–
3 Z
1

------------------ =
3.38 j 9.57 +
17.7 80
 
------------------------------
10.15 70.52
 
17.7 80
 
---------------------------------- 0.57 9.5 –
  
= = =
4.41 1.03 –
 
j 15.38 j 5.81 –
 
+
 
3 5.9 80
  
------------------------------------------------------------------------------------ =
4.72

80
 
1.569 3.5

–
 
7.40

76.5
 
=