SU480134A1 - Resistance relay - Google Patents

Description

pulse, another trigger delay element and the output element OR, to the input of which is also connected the main trigger delay element. FIG. 1 shows the structural scheme of the proposed relay. The following notation is used in the diagram: 1 is a diagram of the formation of electrical quantities, 2 is the logical element "AND, 3 is the logical element OR", 4 is the main element of the delay on response, 5, 6 is the element of the delay on operation, 7 is the pulse extender, 8 - output element “OR. In the proposed resistance relay in order to increase noise immunity and reduce distortion of the dynamic response characteristic of the relay, it is provided to act on two circuits. The relay operates on the first circuit (the main element of the delay pa operation 4 is the OR element (8) occurs when the CONDITION is fulfilled: where the coincidence time by the sign of EI and ES, 4ad (5 + .Ai) ms is the time delay for element 4 to operate. The time setting corresponds to the response characteristic of the resistance relay in the form of a circle. For AC2 - (5 + At) ms, where D is 5ms, the response characteristic of the relay has the form of an ellipse, the ratio of the major and minor axes of which depends on D (Fig. 2). The action of the relay along the second circuit (the trigger delay element 5 is the OR element (8) occurs when the condition is: ass, 5 ms - time delay for element 5 to be triggered. At the same time, the relay on the second circuit cannot be generated from single pulses (one or several) at the output of the element “OR (3). This action is ensured by the presence in the considered circuit of the pulse expander 7 (the duration of the output pulse is not less than 10 ms) and the delayed response element 6. Single impulses for the operation of the relay, which may be false, are eliminated by element 6, which delays the appearance of the signal at the input of the element "OR (eight). So, for the detuning from a single impulse to trigger, the time delay of element 6 should be: 10 if, 20 ms. By increasing the time delay h, it is possible to adjust the number of first pulses per actuation, from which it is desirable to rebuild. The action of the proposed resistance relay is as follows: 1) With the coincidence time of the sign of the compared electrical quantities / co lp, the output of element 4 but is a signal with a frequency of 100 Hz, which through the element "OR (8) affects the output device of the relay. The characteristic of the relay in the complex plane of resistance has for this chain, as already indicated, the appearance of an ellipse (Fig. 2). The response time of the relay along this circuit lies within the limits of ed, (cf, (rear, + S) MSvK. 2) With the coincidence time of the sign of the compared electrical quantities / coinc 4ad2, the response signal with a frequency of 100 Hz e of output 5 is fed to the input of the pulse expander 7. Due to the presence of a delay element 6, a relay is triggered along this circuit (i.e., the signal at the input of the element "OR (8) occurs only after time t. If through time / s the output impulses 5 turned out to be false, are absent, the relay is not triggered, as there is no signal on the input ale “OR (8)”. The relay response characteristic along this circuit is a circle (FIG. 2), and the relay response time, depending on s, is cp, (, 4-10) ms, and, obviously, significantly differ from the response time of the relay in the first circuit. Thus, the proposed device allows, firstly, to get rid of interference and virtually eliminate the difference between the dynamic response characteristic and the static response, and secondly, to perform the relay resistance depending on the response time from the location on complex resistance plane of the resistance vector at the input of the relay. At the same time, the proposed relay operates almost without additional deceleration during metal short circuits in the protected zone (elliptical operation area in Fig. 2). Subject of the Invention A resistance relay comprising connected in series a circuit for generating electrical quantities, elements "AND," OR, a main actuation delay element, characterized in that, in order to improve the dynamic response characteristic and increase noise immunity, it further comprises connected to the output of said element OR serially connected one element of the delay for triggering, the expander of pulses, another element of the delay for triggering and the output element “OR, to the input in which you also plug in the main element of the response delay.

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