SU287185A1 - METHOD FOR DETERMINING THE DISTANCE TO THE LOCATION ON THE EARTH - Google Patents

Description

Known methods for determining; spreading to the following location: we scan the earth on the power transmission line With the switch on (Between the earth and the progressed phase of the source of the current, the current is not allowed to be determined; distance to the location of 1POV; Lamer gadflies.

To make it possible to determine the distance to the location of the damage without disconnecting the faults and tras, the formatting; IB substation | branching lines requires source 1C to determine the inductance of the current; of the tested section of the line, where the source of the search is located.

As a compensating device, there will be a use of capacitive and inductive THBiHbie elem.vnty.

For 1 or higher distance accuracy, the moment of resonance can be determined with the help of a phase-sensitive probe, naP | rome | r wattmeter.

In the drawing (an electrical circuit diagram of the device is shown for implementing the shredded method.

An automatic generator with a given or a belt frequency, and an automatic 1 transformer OR a potential meter switched off via a splitter pspformator to the network | Pe, rev) 1st current.

The determination of the distance to the site of the earth fault using the i-path is carried out in the following technology path.

Example 1. To the grounded phase, through switch 2 and separator choodensor 3, turn on the source of alternating current / with ampere meter 4 and subsequently add additional inductance 5. Then the inductance L (in this version of variable) of inductance 5 is set to in which the iB of the electrical circuit provides resonance. The resonance resonance (compensation of inductive capacitance) is set | By maximum indication of a parameter 4 or more precisely - according to indications including instead of an ampere meter or in series with a phase indicator, for example, a wattmeter with a current source connected to it shifted by 90. At resonance in an electrical circuit, it will give zero readings, which indicates the coincidence of the phases of the current vectors and eg l-: enp. Wherein

the distance / to the place of the glance will be equal to:

one.

KM,

L ,,

where LC is the inductance, corresponding to the magnitude of 6M; BONE CO: P, LOSES

capacitor 3; LK - single inductance Ki: lomet1ra

lineage.

With an unregulated additional inductance 5, the resonance 1 can also be achieved by changing the frequency of the current source.

EXAMPLE 2. When using a capacitor 3 ne (the frame capacitance distance / to the point of closure will be (equal to:

; .-,

km,

X,

where is xc

capacitive 1cOP | capacitor 3 capacitance capacitor capacitance –– (Compensation of inductance 1) for the capacitive line segment and additional inductance 5;

X L -inductive resistance corresponding to the value of inductance installed on the additional inductance 5; XL - inductive resistance of one

Kilo / meter line. Example 3. When using a capacitor 3 of variable capacitance without additional inductance 5 distance / to the location of the trigger will be equal to:

km

BUT ,

where Xc, is the capacitance of the capacitor 3 of variable capacitance — when compensating for the inductive resistance of the tested section

LINE.

Example 4. When using a capacitor 3 of a constant capacitance without an additional Inductance 5, the compensation of the inductive resistance of the tested section of the line is achieved by changing the value of the active resistance connected in parallel to the 1K capacitor 3. At This | distance / to the Closed Location. :

;; .sina-COSa

L - Cl1

to

the magnitude of the active resistance connected in parallel to the capacitor 3, obtained by compensating for the inductive resistance, the level of the lipid.

y arctg

where Xs is capacitive resistance of capacitor 3.

One of the advantages of the present (Variant is the ability to use capacitor 3 with a significantly reduced capacity instead of the required value in H | red | 3, especially for (rheniums at industrial or close to 1 frequency).

In addition to the above options, measuring inductance on disconnected lines can be P | p0: it can also be tested with a special measuring device.

The choice of options P | is produced in accordance with the availability of: che | M equipment (capacitor, additional inductance, 1 generator) and in accordance with the conditions of measurement (key or disconnected line, its length and others).

A safety device 6 is used for safeguarding safety.

Subject invention

Claims (3)

1. Method of determining the distance to the ground fault on the power lines by switching between the ground and the alternating phase of the source of alternating current,  characterized in that, with the aim of determining the distance to the closing point without turning off the taps and transformer substations, the specified AC source turns on through a commutator device, establishes a resonance in the electrical circuit, then determines the inductance of the section under test The lines along which the desired distance is. 2. A method according to claim 1, characterized in that capacitive and inductive elements are used as a compensating device. , 3. The method according to claim 1, characterized in that, in order to increase the accuracy of determining the distance, the moment of resonance is determined using a phase-sensitive Dribor, for example a wattmeter. / V // i2 / / / (