SU1394066A1 - Device for measuring temperature of windings of h.v. transformers - Google Patents

Abstract

The invention relates to a device for measuring temperature. The purpose of the invention is to increase the reliability of the device. In the positive supply voltage half-wave, the generator 2 excites and emits a high-frequency pulse whose frequency is proportional to the temperature of the quartz resonator 1. The high-frequency signal emitted by the antenna 9 is received by the receiving antenna 17 installed inside the protective case 19 of the transformer and connected to the receiver input of the measuring unit through the bushing 20, 1 sludge

Description

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I The invention relates to the field of temperature measurements and is intended to measure the temperature of current-carrying parts of high-voltage electrical transformers and machines, mainly for measuring the temperature of high-voltage trans-windings (3 orthors).

The purpose of the invention is to increase the reliability of the device by ensuring the stable operation of the device when measuring the temperature at any points of the current-carrying conductors of the transformer winding under different modes of operation (operation.

The drawing shows a principal iaH diagram of a device located on the wide side of the current-carrying winding, and a block diagram of the receiving-iio-measuring unit. I A device for measuring the temperature of the windings of high-voltage trans-Yurmators contains a thermo-dependent quarter-cavity resonator 1, switched on (frequency-driving circuit of a high-frequency generator 2 located inside the transformer case assembled on a transistor 3, for example, according to a three-point capacitive circuit and | capacitors 4-6, inductance 7, resistor 8 and antenna

: 9, a power source comprising: a coil 10 of the inductance, immersed on the core 11, and a ferromagnetic: magnetic clip 12, which covers; current-carrying conductor 13 of the winding: a transformer, insulated from other conductors by insulation 14, a receiving-measuring unit 15, located outside the transformer case and consisting, for example, of a receiver 16 connected to the antenna 17, made inside the transformer case, and digital frequency meter 18, calibrated in degrees of the measured temperature.

A core with an inductance coil and a generator circuit are flooded or. pressed into the dielectric. The resulting dielectric block 19 (shown with a dotted line) is inserted between the ends of the ferromagnetic bracket 12 located at the point of the conductor where the temperature is to be measured and the part where the core with the inductor is located.

The device works as follows.

The alternating load current of the transformer flowing through the current-carrying conductors of the transformer creates

in the ferromagnetic bracket and the core magnetic flux. The magnitude of the flux is determined by the cross section of the core and the magnitude of the nonmagnetic gap. The clearance is chosen so that when

The maximum load current is not the core; ALS. This current induces a voltage in the core inductance sufficient to supply the generator.

In the positive half-voltage of the supply voltage, the generator 2 is energized and emits a high-frequency pulse whose frequency is proportional to the temperature of the quartz resonator 1. The high-frequency signal emitted by the antenna 9 is received by the receiving antenna 17 installed inside the protective case 19 of the transformer

and connected to the input of the receiver of the measuring unit through the bushing 20,

Claims (1)

Invention Formula Device for measuring the temperature of the windings of high-voltage transformers, containing a temperature-sensitive element as a sensitive element A quartz resonator included in the frequency-driving circuit of a high-frequency generator at a transistor with a radiating antenna and a power source, consisting of an inductor with a core, a receiving-measuring unit, characterized in that, in order to increase the reliability of the device, the power source additionally contains ferromagnetic bracket, covering the current-carrying conductor of the transformer winding, between the free ends of which is located with a gap inductance core. Vish Shi Order 2211/38 Circulation 607 Random polygons pr-tie, Uzhgorod, st. Project, 4 Subscription