SU943651A1 - Device for automatic checking of commutation apparatus pole operation time difference - Google Patents

Description

(5) DEVICE FOR AUTOMATIC COILING MULTI-TIME OF OPERATION OF POLES OF COMMUTATION DEVICE

one

The invention relates to instrumentation technology, and in particular, to means of monitoring the closure and opening of the contact switching apparatus with functionally independent and dependent poles, and can be used to control the difference in the operation of different poles of the switching apparatus while controlling them, and also at. regulation of the difference of work of the field. Soy switching aparatov at their izgolgolenii.

Currently, the opening and closing times of the power contacts of the switching apparatus are measured in accordance with the recommendations using an oscilloscope or an electric stopwatch l.

However, these tools do not provide the necessary performance and do not allow to automate control operations. In addition, it is not possible to perform such test and control work on existing switching devices in operation without isolating their electrical network, which is often accompanied by interruptions in the power supply to consumers and is not safe for the service personnel.

ten

The closest in technical essence and the achieved result to the invention is a device for controlling the switching timing of the relay contacts.

Claims (2)

A disadvantage of the known device is the impossibility of its use on switching devices embedded in existing electrical networks without disconnecting them. In addition to Torbj, the known device does not allow for the state of the arcing chambers during such work. 3 As it is known, there are severe restrictions on the difference in the operation of the poles of switching devices while simultaneously controlling them. They are caused by the desire to reduce the starting ones when the power consumers are switched on into two phases instead of three, and to improve the operation mode of the electrical networks. At that time, it must be borne in mind that the switching time difference is influenced not only by the accuracy of adjustment of the contact system of the switching apparatus, but also by the state of the arcing chambers. In this case, the worse the state of the arc-suppressing chamber of one of the poles, the earlier the contact between the gap is punched and the switching begins in this phase. Therefore, the switching time difference in different phases of the switching apparatus must be determined not only by the metal closure of the contact groups but also by the simultaneous flashing of the electric arc when switching power circuits performed by the switching apparatus during operation. This goal is achieved by the fact that in the device containing the control trigger and the threshold device, there are fire sensors, arcs, the number of which is determined by the number of poles of the switching device, a generator of a fixed frequency, a counter, an OR logic element and two control elements connected with the input of the counter, the output of which is connected to the input of the threshold element, one of the inputs of the control trigger is connected to the output of one of the logic elements AND, whose inputs are connected to the output I will give arc burning sensors, another control trigger input is connected to the output of another AND gate, one of the inputs of which is connected to the output of a fixed frequency generator, and the other to the output of an OR gate, whose inputs are connected to the outputs of the arc burning sensors. The drawing shows a diagram of the device for automatic control of 4 different times of operation of the poles of the switching apparatus. The device contains arc burning sensors 1 in the arc chamber of each pole, AND 2 and 3i logic elements OR, fixed frequency generator 5, control trigger 6, counter 7, threshold element 8. The device operates as follows. With the presence of different-time operation of the different poles of the switching apparatus, which performs the commutation of power circuits, the electric arc flashes earlier in one of the poles than in the others. At the same time, the arc 1 sensor of this pole sends a signal to element 2, as well as element k, through which it enters element 3 and thereby allows signals of a fixed frequency generator 5 through trigger 6; control enters the counter 7. The flashing of the electric arcs in the other poles of the switch is fixed by its arc-burning sensors, the signals of which are fed to the corresponding inputs of elements 2 and 4. When signals from all arc-burning sensors are received, the last 2 signals a signal to the zero input of a trigger control and switches it over, which stops the arrival of pulses of a fixed frequency of the generator 5 in counter 7. The ignition of the arc of the intermediate pole affects the operation of the device. Thus, the number of pulses received in counter 7 is proportional to the maximum difference in the operation of the poles of the switching apparatus and, with appropriate selection of the frequency of the generator 5, is expressed directly in units of time. The total number of pulses arriving at counter 7 is transmitted to a threshold device 8 with an adjustable response threshold. At different switching times in different phases above the norm, the threshold device 8 gives a warning signal that it is necessary to adjust the contact system of the switch or register its arcing chambers. The use of the invention makes it possible to organize control over the adjustment of the contact systems of switching devices directly during their operation, as well as over the condition of their arcing chambers, without disturbing the power supply of consumers. The effectiveness of the proposed device is provided by improving the starting modes of power consumers, as well as the modes of operation of electrical networks. . Apparatus of the Invention A device for automatic control of work-time variance over a switching device, containing a control trigger and a threshold device, characterized in that, in order to expand the functionality of the device, arc-burning sensors are inserted into it, the number of which is determined by the number of switching poles device, a generator of a fixed frequency, a counter, an OR logic element, and two AND logic elements, with the output of the control trigger connected to the counter input, the output of the claws The ori is connected to the input of the threshold element, one of the control trigger inputs is connected to the output of one of the logic elements I, whose inputs are connected to the outputs of arc-burning sensors, another input of the control trigger is connected to the output of another logical element And, one of the inputs of which is connected to the generator output fixed frequencies, and the other to the output of the OR OR, whose inputs are connected to the outputs of arc-burning sensors. Sources of information taken into account in the examination 1.GOST 687-78 AC switches for voltage above 10006 general technical conditions. 2. USSR author's certificate number 391625, cl. H 01 H 9/00, 1969.