Thytronic NG10 User Manual

FUNCTION CHARACTERISTICS
61
NG10 - Manual - 04 - 2022
B) Choosing the transformer side
[1]
(RefSide) that the current amplitude compensations are taken
as a reference: the side reference chosen by the relay is the one with the lowest mismatching
coefficient. If the two sides have an equal value of the mismatching coefficient, the reference is
chosen as the side with the index H
D) If H is the reference side for current amplitude compensation, the current amplitude factors M (w)
are calculated as follows:
M
(H)
= [m
H
/ m
H]
] / [I
nH
/I
nH
] = 1
M
(L)
= [m
L
/ m
H]
] / [I
nL
/I
nH
]
If L is the reference side for current amplitude compensation, the current amplitude factors M (w)
are calculated as follows:
M
(H)
= [m
H
/ m
L]
] / [I
nH
/I
nL
]
M
(L)
= [m
L
/ m
L]
] / [I
nL
/I
nL
] = 1
Polarity matching
P (w) is the matrix of the amperometric polarity of w side. It allows us to consider each with its own
input current phase angle (coefficient +1 with NORMAL setting) or with opposite phase angle (with
coefficient -1 REVERSE setting), allowing correction of any sw current polarity reversals due to
connection errors.
P(w) is defined as:
The coefficients of amperometric polarity (C09-C10POL for p
L1(H)
, C11-C12POL for p
L2(H)
, C13-
C14POL for p
L3(H)
, C01-C02 POL for p
L1(L)
, C03-C04 POL for p
L2(L)
, C05-C06 POL for p
L3(L)
)
can each take the value +1 (NORMAL) or -1 (REVERSE), based on the programming of the same
coefficients in the Set \ Polarity menu. If the amperometric polarity correspond to those of the cor-
responding wiring diagram programming is +1, otherwise -1.
Note 1 settings of the differential protection are referred to the CT’s rated current on the side chosen by the relay as a reference for amplitude compen-
sation in (Inref).
The side chosen as a reference for amplitude compensation (RefSide) and the primary CT rated current of that side (Inref) are displayed in the
Set \ Base menu
P
(H)
= 0 p
L2(H)
0
p
L1(H)
0 0
0 0 p
L3(H)
P
(L)
= 0 p
L2(L)
0
p
L1(L)
0 0
0 0 p
L3(L)

Thytronic NG10 Specifications

General

Brand	Thytronic
Model	NG10
Category	Protection Device
Language	English