SU1234909A1 - A.c.(voltage) relay - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to relay protection and automation of power systems. The purpose of the invention is to reduce the power consumed from the power source. The relay contains two measuring units 1 and 2, each of which is made in the form of series-connected level indicators (DOW) 4, delay element 5, duration limiting element (EDI) 6 and a common element OR 7. Introduction to each block at its input is The OR-3 switch enables switching of the RI 4 from both the input voltage at the inverting input and from the EDI 6 output signal at the non-inverting input. When choosing toip a little more than 10 ms, the output signals of the duration limiters, overlapping each other in time, provide a continuous output signal. 3 il. U5 (L Out CO 4 CO O CO

Description

The invention relates to electrical engineering, in particular, to relay protection and automation of power systems.

The purpose of the invention is to reduce the power consumed from the power source.

FIG. 1 shows the functional scheme of the proposed relay; in fig. 2 - potentially timing diagrams explaining the operation of the relay; in fig. 3 shows an embodiment of the complete electrical circuit of the relay.

The relay contains two measuring units 1 and 2, each of which consists of a series-connected element OR 3, a level indicator 4, a delay element 5 and a duration limiting element 6, an OR element 7, to the inputs of which are connected the outputs of the duration limiting elements contained in the measuring blocks 1 and 2.

The first measuring unit is triggered with a positive Uux half-wave, the second with a negative one. It should also be noted that the duration limiting element has the property that its output signal appears simultaneously with the appearance of input a, the duration of the output pulses is equal to the duration of the input as long as it does not exceed the specified value, then the duration of the output pulse remains specified and unchanged with increasing duration of input pulses.

The operation of the device is explained by potentially timing diagrams (Fig. 2).

As long as the input voltage amplitude is lower than the reference voltage of level 4 indicators, the circuit as a whole does not work. When the amplitude of the input voltage 8 exceeds the reference voltage at the output of level 4 indicators, pulses 9 and 10 of the corresponding duration appear, but if their duration is shorter than the time of delay elements 5 (1 back), no signal appears at their output and the relay does not works.

If the duration of the said output pulses of the 4 level indicators exceeds 1 back, then the output signals AND 12 and 5 elements 7 and 7 appear, which are fed through the OR 3 elements to the input of the 4 level indicators, ensuring that they are held until the elements 6 return (disappear). duration limits, i.e. the relay is triggered and a signal 13 appears at its output. After the output signal of the duration limiting element 6 disappears, all elements of this measuring unit immediately return, because at this time at the input of this unit there is a half-wave of opposite sign to which it does not react. During the time of the existence of this reverse half-wave, the element of limiting the duration of the block under consideration has time to prepare for repeated operation.

When choosing to: p is slightly more than 10 ms, the output signals of the duration limiters, overlapping each other in time,

° provide a continuous output signal.

As an example in FIG. 3 is shown

The circuit diagram of the relay. Indicators

level for positive and negative

Half-waves are made on operating terminals 14 and 15 operating in comparator mode with a reference voltage. Through the trigger delay circuit, performed on elements 16-19, which serves to detuning from impulse noise, the output unit signal from level indicators P0 is given to duration limit elements 20 and 21, the output signal of which is through diode element OR, performed on diodes 22 and 23 is fed to the output and through additional elements OR to the input of amplifiers 14 and 15.

An additional OR element, for example, in the first measuring unit includes resistors 24 and 25 and a diode 26, and the essence of its operation is that the switching of amplifier 14, which is a level indicator, occurs as from an input voltage across an inverting input, and from the output of the element limiting the duration of the non-inverting input.

Claims (1)

Invention Formula An alternating current (voltage) relay containing two measuring units, each of which is designed as a series-connected level indicator, a delay element and a duration limiting element, connected by an output to the corresponding input of the OR element, the output of which is a relay output that differs in that, in order to reduce the monkness consumed from the power source, an OR element is added to each measuring unit, with one input of an additional element OR connected to the input of the relay, another input - to the output of the limiting element of the duration of the given measuring unit, and the output to the input of the level indicator.  t (rig 2 Compiled by t. Shchegolkova Editor Y. SeredaTehred I. VeresKorrektor .. Demchik Order 2703/55 Circulation 612 Subscription VNIIPI USSR State Committee inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Branch PPP "Patent, Uzhgorod, st. Project, 4