CS213898B1 - Circuitry for mesuring operation capacity of coupling capacitors - Google Patents

Description

BACKGROUND OF THE INVENTION The invention relates to a circuit for measuring the operating capacity of a 110 kV coupling capacitor of a ripple control transmitter, mainly for determining the dependence of the operating capacity on ambient temperature.

The method used so far to measure the operating capacity of the 110 kV coupling filter capacitors is carried out after installation by the low-voltage resonance method. In this measurement, the results are not the same as when the capacitor battery is connected to a voltage of 50 Hz. Alternatively, the capacity can be measured as a function of temperature at a nominal voltage of 50 Hz with a Shering bridge, but with respect to 110 kV battery power only on one capacitor, so the resulting battery capacity cannot be determined.

These drawbacks are essentially overcome by wiring for measuring the operating capacity of the 10 kV coupling capacitors of the ripple control transmitter, mainly to determine the capacity dependence on the ambient temperature of the invention. It is based on the fact that the two phases of the coupling filter, i.e. the terminals of the capacitor batteries, are connected to the same phase of the network. The secondary winding of the isolation transformer, whose symmetrical center is connected to the station ground terminal, is connected between the ground and the winding terminals of the two respective coupling transformers. The primary winding of this isolation transformer is connected to a frequency source.

Designed and operationally tested circuit enables long-term operational measurement of the capacity of the whole battery 110 kT, which is under voltage of 110 kT at the tone frequency, even

213 898

213 898 at both the resonance and complex impedance measurements. A famous advantage is the fact that the impedance of the connected network does not affect the accuracy of the measurement because it does not apply in the circuit and that the measurement results can be compared both with and without the applied voltage of 50 Ba. Also the content of natural harmonics in the network voltage of 50 Ha. does not affect the accuracy of measurement of operating capacity ·

Connection example for measuring the capacitance of coupling capacitors according to the invention It is schematically shown in the attached drawing.

A switch 7, a voltage measuring transformer 8 and a current measuring transformer 9 are connected to a selected one of the three phases of the network. In addition, two capacitor batteries 5 are connected in parallel.

Each of them is connected to a winding 411 kV coupler whose ground terminals are further connected to the secondary winding of the isolation transformer 1. Its symmetrical center is connected to the station ground 3. The primary winding of the isolation transformer is connected via voltmeter 10 and ammeter 11 to source 2. The switch 7, the voltage transformer 8 and the current transformer 9 are connected to the second selected phase of the network. The remaining phase 6 of the network is connected with a switch 7, a voltage measuring transformer 8, a current measuring transformer 9, a capacitor battery 5, a winding 411 kV of the coupling transformer and a station grounding 3.

In the measurement, the two measured branches of the capacitor battery 5 are connected in parallel and connected to the same 110 kV mains voltage, so that the same 50 Hz current flows through them. Leading out the center of the secondary winding of the isolation transformer 1 cancels the magnetization effect of the 50 Ha currents in this winding · The tonal frequency current flows through the secondary winding of the isolation transformer 1 and closes by the two branches of the capacitor battery 5. of the transformer 1, even to phase 6 of the 110 kV current network and does not flow through the tonal frequency *

Use of the invention is envisaged for mass remote control in power engineering.

Claims (1)

Wiring for measuring the capacitance of the 110 kV coupling capacitors of the ripple control transmitters mainly for determining the dependence of the operating capacity on the ambient temperature, characterized in that the two phases of the coupling filter, ie the capacitor battery terminals (j), are connected to the same phase a secondary winding of the 110 kV winding (4) of two respective coupling transformers is connected to the secondary winding of the isolation transformer (1), whose symmetrical center is connected to the earth ground terminal 13, while the primary winding of this isolation transformer (1) is connected per frequency source (2).