Page 20

ΔU₆

ΔU₅

≈

0.13 · (1 + p · 0.5)

(1 + p · 0.03)²

G_БН(p) =

ΔU₅

ΔU₁

ΔU₆

ΔU₅

4 · (1 + p · 0.156) · e^{-p · 0.0053}

1 + p · 0.6

0.13 · (1 + p · 0.5)

(1 + p · 0.03)²

K_БН = 4 · 0.13 = 0.52

7.7. Reactive Current Sensor (DRT) -see fig.9b at the page 21.2

According to adjustment data:
I_a = 0; I_r = I_rн = 21400 · 0.425 = 9100 A

Current transformer ratio K_т =

24000

At I_рн CT output current:

5·9100

24000

1.94 A

KДРТ

KДРТ1

KДРТ2

At 1.94A DRT output voltage: 5 V KДРТ2 = 5/1.94 V/A

K_ДРТ1= 1.94/0.425 A/p.u

In per -units system:

I_рн*

I_rн

I_б

9100

21400

0.425

p.u

ΔU_ДРТ

ΔI_р✱

K_ДРТ

1.94

0.425

11.7

V/p.u

ΔU_{ДРТ -}to Input node to amplifier Д3 in unit БН (page 22.1)