SU539281A1 - Device for fixing electrical quantities - Google Patents

Description

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The invention relates to the field of electrical engineering, in particular, to devices for fixing electrical quantities at short circuit (K-3.) On electrical transmission lines. Demonstrations of devices may be used to determine the distance to the injury.

Similar devices are known that contain an input unit connected by one output to a memory block, and the other through a trigger organ to the delay start block is fault-free. No, the delay end block is memorized, one of the outputs of which is connected via a logic circuit I to a control unit with a voltage converter the output number, and the other outputs of the memory start delay block and the memory end delay block, are connected to a memory block, which is connected to the counting input through the voltage converter; ika pulses, and the power unit.

When a detectable signal is detected at the device input, the triggering organ is triggered, the block of the memory start delay sets the beginning of the computed electrical quantity to be fixed in the memory. The end of memory delay block sets the final moment of the memorization process and sends a signal about the end of the memory to the input of the element I. When it appears on

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the second input element And the signal from the external contact alarm signaling (AC) about the emergency shutdown element And starts the control unit. AC signal is affected by

pulse counter, set it to the ready state. The control unit gives permission to the voltage converter — the number to convert the electrical quantity recorded in the memory into the number of pulses, which are recorded by a pulse counter.

A disadvantage of the known devices is that in the event of an emergency shutdown in case of interfacial short circuits, when no signal appears at the input of the measuring unit, is to be fixed, the AC signal sets the pulse counter to the ready state. This significantly complicates the actions of the staff on duty, impairs the operation

devices, since the information is not recorded (the measuring unit does not work), and the alarm on the counter is triggered. Thus, the known devices do not provide the necessary level of suitability.

The proposed device differs from the known ones in order to increase reliability between the control unit and the voltage converter — the number is switched on a time element, and the control unit is connected to the power supply of the pulse counter.

The drawing shows a block diagram of the proposed device.

The device contains a triggering organ i, an input unit 2, a delay unit 3 start memory, a delay unit 4 end memory, a storage unit 5, a logical element AND 6, a control unit 7, a voltage converter - the number 8, a time element 9, a pulse counter 10 and power supply unit 11.

The connection entered between the control unit and the power supply of the pulse counter provides the connection to the power supply voltage counter (ensures the state of readiness of the counter) after the appearance at the inputs of the element AND of the AC signals and the storage of the electrical value in the block 5. Thus, the control unit sets pulse counter to ready state only if there is a fixed signal.

The device works as follows. Before the occurrence of a fixed signal, it is in standby mode, ready to receive information, the pulse counter is de-energized and does not consume energy.

When a fixed signal appears at the input of block 2, it generates a signal that ensures the triggering of the trigger, prepares the memory block 5 for operation. The trigger triggers block 3, which, after a delay time, causes Paspeineiiiie to begin to store in block 5 the value proportional to the fixed signal tension The delay 4 determines the end moment of the memorization process, and also signals the end of the memory to input element AND 6. When | the second input of the element AND signal from the external AC contact is received and the control unit 7 starts up, which provides the ready state of the counter 10 by connecting a supply voltage thereto. In addition, the control unit with a time delay (which is provided by element 9) gives permission to start converting the stored electrical value into a series of pulses by a voltage-number converter 8. The pulses are recorded in the counter and by their number judge the value of the input signal being fixed .

Thus, the additional connection between the control unit 7 and the power supply circuit of the counter 10 ensures the readiness of the counter only if there are emergency shutdown signals and the end of the memorization process at the inputs of the element And 6, and the time element 9 ensures the start of operation of the converter 8 after setting the meter to the ready state, which excludes the possibility of loss or distortion of information days.

Claims (1)

Invention Formula A device for fixing electrical quantities, e.g. voltage, comprising an input unit connected by one m output to a storage unit, and another through a triggering organ to the memory start delay unit, a memory end delay unit, one of whose outputs through a logic The I circuit is connected to the control unit, the output of which is a voltage-to-digital converter, the other outputs of the memory start delay block and the memory end delay block are connected to a storage unit, which is connected to the counter input counter, through a voltage converter, as well as a power supply unit, characterized in that, in order to increase reliability, between the control unit and the voltage converter, the number is included a time element, and the control unit is connected to the power supply circuits of the meter Pulse. uircupyeHnu. Signal