PL160515B1 - Circuit for checking an alternating current transformer - Google Patents

Abstract

System for checking the current transformer alternating current, containing two transformers mg ) ki, equality state index and admittance divisor current with an inductive divider, characterized by that the terminal marked with (ZP1) of the primary winding (UP1) of one transformer (PI) is connected to the mass of the system (M2), while the terminals are marked with (ZW1) of the secondary winding (UW1) of the first transformer (PI) and terminals (ZP2 1 ZW2) of the winding primary (UP2) and secondary winding (U W2) of the second of transformer (P2) are connected in the common one the point (W) where the terminals are also connected the setting elements of the capacitor (C) 1 resistor with the conductance (G) of the admittance current divider (ADP), while unmarked winding terminals secondary (UW1) 1 (UW2) of two transformers (PI 1 P2) are connected via resistors (R1 1 R2) to ground the system (M 1) to which the second inductive terminal is connected divider (DI), and the first terminal of this divider (DI) is connected to a common point connections of the second resistor (R2) 1 capacitor (C) and with a terminal of an unmarked secondary winding (UW2) of the second transformer (P2), while the third the divider terminal (DI) is connected to a resistor o conductance (G).

Description

The subject of the ^^ «^. ^ Azku is an AC current transformer current transformer circuit, intended for the application of the electrical measurement technique.

From common use, a system for the AC current transformer generation is known, which includes two transformers, a balance conditioner and an admittance current divider with an inductive divider.

From the article: Dunfee B.L. Fri: The design and performance of multirange current transformer standards for audio frequencies, posted on IEEE Transaction Instuuments and Ι ^ 3ΐΐΓϋκηΐ vol. IM-14, Decsrnmer, 1965, there are known dt derating circuits ^ current transformer with transformers 1, ni η · * 1, where n Is a natural number. The known system includes a couple of transformers, an equilibrium indicator and an admittance current divider with an inductive switch. The disadvantage of the known systems is the lack of motility to directly generate metrics with gears smaller than One.

Wyrnlazek concerns the current transformer dt circuit, characterized in that the marked terminals of the outer windings of the transformer and the terminal marked with the earth connection of the second transformer are connected by a separate point. At this point, the terminals of the rose indicator and the following elements of the current divider: capacitor and resistor are connected. Unmarked terminals of secondary windings of transducers through resistors are connected to the race of the system. An inductive divider is attached to the system and the point of connection of the unmarked secondary terminal of the second transformer with the resistor. A capacitor and a current admittance resistor are connected to the output terminals of the inductive divider. To the connection point to the two resistor ^, which is connected to the race of the circuit, the second terminal of the status indicator rCMn <ooagi is connected. The terminal marked with the pielwotiigo winding is connected to the system msa.

A beneficial effect of the application of the system according to the invention is the fact that it is possible to directly derive a gear with the lower gears, td, Unity, without the need to perform additional measurements.

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The subject of the test It is explained in the example in the figure, which shows the schematic diagram of the system for checking the AC transformer with a ratio smaller than one. The circuit for checking the P2 current transformer consists of a reference transformer P1 with a ratio less than one, whose terminals marked ZH and Tl2 of the secondary windings IM1 and l> 2 and the terminal marked ZP2 of the primary winding UP2 of the transformer P2 are connected to a common point W, to which they are connected. Also * Z balance indicator terminals and element! setting of admittance current divider ADP of capacitor C and resistor of conductance G. Unmarked terminals of secondary windings IM1 and l> 2 transformer! P1 and P2 are connected through the resistor R1 and R2 with the circuit race M. To the terminals of the resistor R2 is connected an inductive divider DI, whose terminals w ^, jśc: Łcwe are connected with the capacitor C and the resistor o G of the admittance current divider ADP. At point Ml a second terminal of the status indicator r! Nweights * Z is connected. The marked terminal ZP1 of the primary winding UP1 of the transformer P1 is connected to the race of the M system. The unmarked terminals of the primary windings UP1 and UP2 of the transformers Fl and P2 are connected to the source of the supply current.

The principle of operation according to the invention consists in comparing the current to a common point V! priming lPl and lP2 and secondary currents 1W1 1 lW2 dividers Pi and P2.

Claims (1)

Patent claim AC current transformer generation circuit, including transformers, equation indicator 1 admittance current divider with an inductive divider, characterized in that the terminal marked / ZP1 / pieiottnegt / UP1 / one transformer / P1 / is connected with the circuit type fV2l, while the terminals marked / 3M / of the main winding of the five transformer / P1 / and the terminals / ZP2 and 3f2 / of the primary winding / ^ 2 ^ / and of the primary winding / WZf of the second transformer / P2 / are connected with a common point A / with which the terminals are connected element of the following capacitor / c / and a resistor with a conductance / G / admUtational current divider / ADP /, while the unmarked terminals of the outer windings / UW1 / and / \ M2 / for two transformers / P1 and P2 / are after? connected by resistors / R1 and R ^ / with the race of the system / Ml / to which the second terminal of the inductive divider / Dl / is connected, and the first terminal of this divider / Dl / is connected with the common connection point of the second resistor / R2 / and the capacitor / C / and with the terminal of the unmarked otor otornego / UW2 / of the second transformer / P2 /, while the third terminal of the divider / Dl / is connected with the resistor t condiutenc Ji / g /.