SU1422252A1 - Magnetoelectronic measurement voltage transformer - Google Patents

Abstract

The invention relates to information and measurement technology. The aim of the invention is to improve the accuracy and reduce the weight and size parameters. The electronic voltage measuring transformer contains a cascade voltage transformer having primary windings 1, secondary equalizing windings 2, additional windings 3. One of the sections has a measuring winding 4 to which the measuring device is connected. The primary windings 1 are connected in series with each other and the input of the electronic amplifier 6 is connected in series with them. The secondary windings 2 are connected in parallel and according to. The outputs of the electronic amplifier 6 are shorted to additional windings 3, and it is connected to an independent power source 7. 1 Il. i O)

Description

4ii 1C N3 GI Yu

The invention relates to information-measuring technology and can be used to accurately transform high voltages. The purpose of the invention is to increase accuracy and reduce the weight and size parameters of measuring transformers ™ of armature,

 The drawing shows the conceptual diagram (the proposed JHoro transformer gauge, j Magnetic measurement electronics (voltage transformer consists of a Cascade transformer having primary windings 1, secondary equalizing windings (nital windings 2, additional windings Zo Number of turns of additional windings 3 significantly less than the number of turns of the windings 1.: One section has a measuring hook 4, to which the connection: whose measuring device (voltmeter) is | 5; In addition, the electronic amplifier is part of the transformer ™ i torus; 6 current having a low input resistance and several high-resistance outputs, the number of which is equal to the number of sections, and a large coefficient K of current amplification, as well as an autonomous voltage source 7, which is not galvanically connected to tires whose potential differs from the potential of tires measured by none.

The primary windings 1 are connected to each other in series and in series with them the input of the electronic amplifier 6. The secondary windings 2 are connected in parallel and according to. Their main purpose is to equalize the parameters of the sections. The electronic amplifier's output is shorted to the additional windings. Zo The electronic amplifier 6 is connected to an independent power supply 7.

The transformer works as follows.

The input voltage causes an electric current in the primary windings 1 If the gain of the electronic amplifier was zero, the value of this code would be determined by the sum of the inductive and active resistances of the windings 1. The input resistance of the amplifier is small, so it has almost no effect on the input current (winding current 1). The electronic amplifier 6 amplifies the winding current 1 K times and creates a current in

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additional windings 3. Since the output impedance of the amplifier is large, and the windings 3 have the number of turns, their current is completely determined by the electronic amplifier and does not depend on the own resistance of the windings and the EMF induced by the input voltage. Since the current of the windings 3 is completely equivalent to the input current in all parameters and differs only in its value, the EMF created by the current in the winding-3 is completely equivalent to the input voltage for all the main parameters (shape, phase, frequency). Moreover, the windings 3 are turned on so that the EMF is subtracted from the input voltage. This leads to a decrease in current with the same number of turns of the primary windings 1.

With a sufficiently large amplification factor for the current of the electronic amplifier 6 (K 1), the input current tends to zero, even if the inductive resistance of the windings 1 is small. This allows sweating sections on ferromagnetic cores, the iron mass of which is small. The latter is due to the fact that inductive tracking of the windings uniquely depends on the magnetic resistance of the magnetic circuit. A decrease in the mass of iron leads to a corresponding increase in the magnetic resistance and a decrease in the inductance of the winding. Accordingly, it is not necessary to wind the windings 1 so that they have a definite relationship between the active and inductive resistances. This allows the primary windings from the microwire to the glass insulation, which drastically reduces the copper mass of the windings and the insulation, as well as the overall dimensions occupied by the winding. The accuracy indicators are higher than the cascade transformers of a similar purpose due to the fact that That the EMF induced by the currents of the windings 3 in the windings 1 and the winding 4 is exactly proportional to the input voltage and does not depend on the inductive and active resistances of the windings 1 and the parameters of the magnetic circuit.

The use of the proposed measuring transformer makes it possible to reduce the weight and dimensions by approximately one order of magnitude and, at the same time, to increase the accuracy. This is especially important31422252.

but for portable measuring devices, in order to reduce the voltage mastransformers, overall dimensions and increase the measurement accuracy, there is a third winding of all sections of the invention, the electronic amplifier has an automagnetoelectric measuring power source and a low

voltage transformer, input input resistance, as well as non-cascade transformer and elec- trical high-resistance outputs, the number of R-amplifier, each Q being equal to the sowing number, and

section cascade transformer electronic amplifier included

contains a ferromagnetic magneto-successively with the primary winding and two windings, and one of the sections, each of its output is connected to

has the third and fourth windings, one of the conclusions of the third winding

The primary windings of all sections of the connection of each section, the second outputs of all nena are consecutive and are the third of their windings connected to the autonomous unit of the transformer, and a quarter of the winding power supply, and the second one section of the winding of all sections are connected to a parallel transformer that distinguishes - very.

Claims (1)

Claim A magnetoelectronic voltage measuring transformer, consisting of a cascade transformer and an electronic amplifier, each section of the cascade transformer containing a ferromagnetic magnetic circuit and two windings, and one of the sections has a third and fourth winding, the primary windings of all sections are connected in series and are the input of the transformer, and the fourth winding the fabric of one section is the transformer output, characterized in that, in order to reduce the overall dimensions and improve the accuracy of measurements, all other sections have a third winding, the electronic amplifier has an autonomous power supply and low input resistance, as well as several high-resistance outputs, the number of _{10 of} which is equal to the number of sections, the input of the electronic amplifier connected in series with the primary windings, each output connected to one of the terminals third winding 15 of each section, the second terminals of all third windings are connected to an autonomous power source, and the second windings of all sections are connected in parallel.