SU25619A1 - Direct current relay - Google Patents

Description

 CyyiiiectByet p drills, for which proper operation of the operating current should remain almost constant. An example of such a relay can serve as a slow-acting, i.e., releasing its measles only after a certain period of time after the working current is interrupted, the relay operating on kauarakt, etc.

Meanwhile, the resistance of the copper winding of the relay varies depending on the temperature and the changes can, in the case of outdoor installation, reach significant values. When the supply voltage of the relay source is constant, the current through the relay coil will also be replaced, but in the reverse direction. The result of the conditions will be a change in the response time of the relay, reaching with a slow-acting relay up to 60 when the resistance changes with the corresponding fluctuations of temp.

The present invention aims to reduce the mentioned oscillations of the relay mode to practically acceptable limits, and consists in the fact that part of the relay coil is partitioned and provided with an appropriate number of branches, and the turns lying between two adjacent branches are short-circuited by contacts controlled by bimetallic plates .

The drawing shows a diagram of the relay, in series with the part: winding

which vk; lk cheny coils 5, 5 and 4; To these turns .3, hj / i 4 are connected with a help and the wires are contacts 7. 7 and 5, respectively, equipped with adjusting screws. Around the contacts 7, 6 and about are bimetallic plates 10, 9 and 6, connected to each other and connected to one of the terminals of the relay. The number of Zhitkov of each branch is selected by the following considerations. For a relay to function normally, a certain number of amps are required; when the temperature rises, the resistance of the coil increases; consequently, the strength of the current, and with it the ampere-turns, decrease. If you turn off or short out part of the turns, the current will increase, but at the same time the number of turns will decrease. If the reduction in the number of turns causes a proportional decrease in the total c6 resistance and winding, then the total number of ampere turns remains the same as when the full winding is turned on, that is, turning off will not give any benefits in the desired direction. A necessary condition for obtaining an increase in the number of amPer-turns when a part of the winding is disconnected is that in this case the decrease in resistance goes faster than the decrease in the number of turns, i.e.. so that the current increases faster than the coils decrease. This can be achieved in various ways: by closing the outer layers of the winding, in order to enhance the TjjeiSyeMoro effect 9T LAYERS can be MADE from a wire of greater resistance, or by winding special sections, from a wire of greater resistance than the main winding.

Since the practice does not require full legs. Constancy of ampere-turns changes by jumps, such as due to the circuit, is quite acceptable. The number of short-circuit steps is taken in: Compliance with the expected limit - temperature variation with the required degree of accuracy.

In those cases when the relay coil is continuously energized, its temperature is determined by both the external temperature and the amount of heat released in the winding. In order for the regulating device to respond to the temperature of the relay itself, the bimetallic plates are set in such a way that they are exposed to this temperature by strengthening them, for example, on the core of the relay.

The contact screws S, 6 and 7 are adjusted so that the plates will come into contact with each other as the temperature rises; in this case, there is a sequential short circuit of the winding parts 4, 3 2. When the temperature drops, the winding parts, 3 2, turn on in the reverse order:

.- .. EXAMPLE FET 3 About the Bibliography.

 direct current, powered by a constant voltage source, is different because the windings of its electromagnet are connected to bimetallic plates b, 9, 10 so that when the temperature rises a part of the windings is shunted and the ampere turns of the included part the relays did not change, despite the increase in the resistivity of the winding wire.