Tonghui TH2840 Series - Transformer Single-Machine Test; Circuit for Transformer Single-Machine Test; Some Parameters of Transformer; Transformer Single Test Circuit and TURN Test

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Chapter 6 Transformer Single-machine Test
6.1 Circuit for transformer single-machine test
6.1.1 Some parameters of transformer
C
R1 R2
C1 C2
L1 L2
M
6.1.2 Transformer single test circuit and TURN test
SEC+
SEC-
Hc
Hp
Lp
Lc
U1
U2
Nsp = U2 / U1
TH2818
On TH2840X, TURN test has 4 display modes:
 Ns: Np =U2/U1
 Np: Ns =U1/U2
 Ns = Np*U2/U1
 Np =Ns*U1/U2
The above U1 and U2 are the values automatically measured by the instrument, and the values of
Np and Ns need to be set by the user in advance on the corresponding turns ratio parameters on the
< Single Setup> page.
It is recommended that users put the winding group with more turns in primary winding rate, the
reasons are as follows: