SU113317A1 - Instrument for testing polarized and electromagnetic telegraph type relays - Google Patents

Description

The known devices for testing polarized and electromagnetic telegraph type relays can be used to determine the neutrality, differential, return, return coefficient and closing reliability of the relay contacts.

The proposed device is more perfect than the known ones, since it allows to receive pulses with a frequency (50 baud), which is independent of the power supply voltage fluctuations.

For this purpose, a device used a relay frequency divider, made in the form of two relays, included in the industrial frequency network and the rectified current circuit, so that the relay of one relay oscillates with the frequency of supplied alternating current, and that of the second with half the frequency.

The drawing shows the electrical circuit of the proposed device. The device is powered from AC mains through transformer 1, rectifier 2 and filter 3.

The rectangular pulses of the required frequency of 25 Hz (50 baud) are obtained by means of a relay frequency divider consisting of two polarized relays 4 and 5. One of these relays operates from an alternating current network - 50 Hz, and the other divides this frequency in half.

In order to avoid damage to the contacts of the tested relays 6 t 7 (when the contacts of the relay and 5 are closed), incandescent lamps 8 are installed in their circuits, which light up during a short circuit. The same lamps 9 are used to signal the reliability of the closure of the contact groups of the relays to be tested when triggered and released.

To extinguish the spark between the contacts of the relay 5, a spark-suppression loop JO is inserted, consisting of two capacitors.

The measuring circuit of the device allows to check the neutrality of the sensor, the current of the tested relay, the neutrality of the tested relays 6 (type RP-4) and 7 (type TPM), the output of relay 6 and 7, the current in the first winding of the tested relay 11 (type RCM) , current in the second winding of the relay //. Required switching to meter. the device’s circuitry is carried out by a switch 12,

In addition to the switch 12, additional controls are installed on the front panel of the device: a switch 13 for switching the contact groups of the tested telephone relays and determining whether the indicator lights 9 are close to close; a switch 14 for changing the current in the windings of the tested telephone relay of the RCM type in determining the response current or the release current; switch 15 to turn on the device; a button 16 for switching the windings of a tested relay of the TPM type, as well as for switching on a milliammeter 17; button 18 for disconnecting the circuit of the tested relays of the TPM and RP-4 type and connecting the circuit of the tested relay of the PKM type; in addition, it serves to determine the reliability of operation and release of the telephone relays of the PKM type;

control knobs for setting the recoil and setting the operating current in the windings of the tested telegraph relays.

Subject invention

An instrument for testing polarized and electromagnetic telegraph type relays, which can be used to determine neutrality, differential, return, return coefficient and contact closure reliability of a relay, which is connected to the industrial current frequency network, characterized in that, in order to obtain independent oscillation supplying the device, for example, pulse frequency (50 baud), adopting a relay frequency divider, included in the industrial frequency network and in the rectified current circuit, so that the relay of one relay oscillates with the frequency peremepnogo let down current and the armature of the second - with a frequency twice mensche