SU1358016A1 - Method of calibrating electromagnetic disconnectors of automatic circuit-breakers - Google Patents

Abstract

The invention relates to electrical engineering and can be used in the calibration of electrical protective devices. The purpose of the invention is to reduce the complexity of the calibration process due to the automatic compensation of technological errors at the calibrated releases. Prior to calibration of a batch of electromagnetic releases, for the current, the setpoint characteristics of one of the batch samples and for various currents in the coil of the reference electromagnet are determined. Then, according to the family of tractive characteristics of the reference electromagnet, such values of the gap and winding current are determined at which it develops the same tractive force as the release. After installing the calibrated releaser 9 in the installation device of the standard § 3 × 10), FIG. f

Description

The electromagnet 3 is set using the scale 5 and the pointer 6 to the position corresponding to the current value of the setpoint of the calibrated splitter 9, while the rod 7 of the electromagnet 3 contacts the gear 8 of the release 9. Through the coil A of the electromagnet 3

The invention relates to electrical engineering and can be used in the calibration of electrical protective devices.

The aim of the invention is to reduce the laboriousness of the calibration process by automatically compensating for technological errors at the calibrated releases.

FIG. 1 shows a device for carrying out the proposed method; in fig. 2 - the release at different positions of the core.

A device for calibrating electromagnetic breakers of circuit breakers (Fig. 1) contains a screwdriver 1 -c electric motor drive 2, a control system that is connected to a power source, a reference electromagnet 3, the coil 4 of which is also connected via a measuring device calibrated in the setpoint currents power supply, scale 5, calibrated at the same setpoint currents, and pointer 6, by means of which the reference electromagnet 3 can be moved to the position corresponding to the setpoint current, the rod 7 the reference electromagnet 3, which, when calibrated, acts on the bore 8 of the release 9 and is rigidly connected to the core 10 of the electromagnet 3, the pressure device 11 fixing the position of the core 8 of the release 9 relative to the stem 7, squares 12 and 13, table 14, on which the reference is fixed an electromagnet 3 and a release 9, the opposing spring 15 of which, tightened with a nut 16, transmits the force to the bark 8.

Prior to calibration, a batch of electromagnetic trips is determined for the setpoint current Ipj, and the current corresponding to the settable value of the calibrated release is chosen. In this case, the rod 7 of the electromagnet 3 acts on the measles 8 with a given force. S distance and current. remain constant when calibrating the entire batch of releasers, 2 Il.

characteristics on one of the samples of the electromagnetic release 9 (Рр f (c / p)), where Рр is the trip force of the release, с / р is the evaluating working gap for various currents in the coil 4 of the reference electromagnet 3; (PJ f (ty j), where PJ is the th force of the reference electromagnet, the working gap. Then for nominal

the gap, (or for the average value of the tolerance field equal to / po (, + o / pp / 2) - and the setpoint current Ip of the release 9. determine its pull force Pp f (lp | ,, / p) and the angle of inclination d trash

The characteristics, which in the working area, where the working gap due to technological errors in the manufacture and assembly of the release can vary from c / pj (Fig. 2), has a linear relationship. Then, based on the family of tractive characteristics of the reference electromagnet, such values of the gap f and the winding current Ijg are determined, at which it develops

about

Po) as

same traction

and trip and provides such

the same angle of inclination (o (p) t goby

characteristics in the clearance tolerance area

trip unit

After installing the calibrated releaser 9 in the installation device, the reference electromagnet 3 is set using the scale 5 and pointer 6 to the position corresponding to

the current value of the set point of the calibrated release 9, while the rod 7 of the electromagnet 3 contacts the core B of the release 9. Through the coil 4 of the electromagnet 3, the current corresponding to the value of the set point of the calibrated release 9 is passed through a measuring device calibrated in the current of the release set point 9. When This rod 7 of the electromagnet 3 acts on the measles 8 with a given force.

When calibrating the batch of releasers to the setpoint current 1p, distance S (Fig. 1) between the fixed reference planes of the working clearances of the release 9 and the reference electromagnet 3 is set so that at the nominal clearance fpg in the release 9 and when the rod 7 of the reference electromagnet 3 is in contact Corore 8 regarded the gap of the reference electromag- 15 differing in that

filament 3 is cG and a current Ij is delivered to the winding, and the distance S and the current Ij remain constant when calibrating the entire batch of releasers.

During calibration, the force of the pre-tightened opposing spring 15 of the releaser 9 is gradually weakened, which brings this force to the value at which the measurine 8 of the releaser 9 starts to move, after which the nut 16 is fixed, thus eliminating the possibility of calibration.

Since, due to technological variation, the gap from sample to sample may vary, with a smaller clearance, c / p (for 1p const) to measles 8

Rch

the release, greater force acts, and vice versa, with a larger gap

Cp2 HS Measles 8 acts less effort.

 Thus, the proposed calibration method provides automatic compensation for the technological variation of the working gap of the release, and this leads to an accurate calibration of the release for a given setpoint current.

Claims (1)

Invention Formula The method of calibrating the electromagnetic circuit breaker releases, at which the normalized gap between the core and the core pole is established, sets the adjusting device with a counter force greater than the value corresponding to the set current to be calibrated, passes a calibrated current through the coil equal to the set point and changes the position of the release device before the trip. five in order to reduce the laboriousness of the calibration process by automatically compensating for technological errors at the calibrated releases, 0 measures the force at the moment of moving, developed by the release ring while passing the setpoint for gap values equal to the nominal and permissible extreme deviations, after which the auxiliary reference electromagnet is set so that its rod touches the release core and is determined The x core of the tripping device is the current in the coil of the reference electromagnet and its position, at which the magnitude of the force on its core will be equal to the corresponding tripping force of the release, then the reference electromagnet nit is set poured so that with the nominal gap in the trip unit and in contact with the electromagnet rod reference releasers anchor it at the previously defined stream razvi0 shaft force equal to the force of the armature trip unit at a nominal gap and current setpoint and the current passed through the winding calibrated reference electromagnet. Editor L. Langazo Compiled by N.Glekler Tehred A.Kravchuk Order 6003/53 Circulation 697 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 FIG. 2 Proofreader A. Obruchar