SU579674A2 - Device for checking operating state of discrete automatic apparatus - Google Patents

Description

The invention relates to electrical engineering 8, namely, to relay protection devices and emergency automation of apectric installations, and is an improvement of the known device according to the main auth. 5 No. 547895 ..

The known device makes it possible to check the operability of discrete automation equipment, for example, relay protection, without switching off the control of the controlled object and without removing the equipment from work. (This device contains a reference signal source, connected via a control key with an indicator and a test block associated with the switching mechanism of the switching device, and a trigger. One trigger input is connected with the key-control, the other input is connected between the checked the unit and the switching mechanism, and the output is connected to the tested unit and the indicator.

The disadvantage of the known device is that it does not control the operability of the switching mechanism of the switching apparatus. This limits the functional functions of the switch.

device capabilities and reduces the number of blocks whose health can be checked

The purpose of the invention is to expand the functional capabilities of the device,

Psk; the target is reached by the fact that a block made in the form of two current sensors and a logic element and a direct output nei and inverse output of the second current sensors through the logic element I is connected to the device between the tested block and the switching device switching mechanism second trigger input.

The drawing shows a block diagram of the proposed device.

Equipment 1 discrete automation consists of measuring logic 2 and output 3 organs. The control signal to the measuring and logic body 2 comes from the output of block 4, containing measuring current transformers, voltages, sensors, etc. The output body 3 t1 mechanism switching mechanism 5 switching apparatus

To control the health of the hardware, the hardware 1 of the switching mechanism 5 uses a trigger

6, connected via button 7 to the source 8 of the control signal, the indicator 9 and the newly introduced block 10. 10 is connected between the tested equipment 1 and the switching mechanism of the switching device. This unit includes current sensors 11 and 12 and logic element 13. 13. Direct sensor output 11 and inverse output of sensor 12 are connected to gateways of the logical element. And 13 whose output is connected to the second trigger input 6. Current sensor 11 responds to those mechanical faults: ma 5 switching at which the current is insufficient for triggering the mechanism / interruption Ts9T1I, increasing transient resistances / Contacts, lowering the supply voltage and TatsU,, The current of the current sensor 11 is set equal to the minimum TOK of the switching mechanism 5 Koiv mutational apparatus. Current sensor 12 ryo & is supplied for full and inter-intermittent short-circuits in the switching device circuit. The pickup current of the sensor 12 is selected slightly greater than the maximum current of the serviceable switching mechanism.

To check the operability, the button 7 is pressed. In this case, the trigger 6 is moved to a position in which the signal from the source 8 of the control signal arrives at the indicator 9 and the input of the equipment 1 of the discrete automatics. remote current 11 .: At the same time, at the output of logic 1 and 13, a signal is generated, which arrives at the second time of trigger 6 and transfers it to its initial state. Turning off the signal of source 8 of the counter signal from the indicator 9 and instruments 1.

In order for the health check signal not to lead to a false actuation of the switching mechanism S of the switching device, the total switching time of the trigger 6 and the additional decoding unit 1O and

The return time of the equipment 1 of the discrete automatics should be less than the time of moving the switching device 5 of the switching device.,

If the checked equipment 1 of the discrete automatics is faulty or in the circuit of the switching device switching mechanism 5 the current is insufficient for its operation, then the current sensor 11 will not work. If there is a short circuit in the circuit of the switching device switching mechanism 5, then the current sensor 12.:In the output of the logic element I 13, the signal does not appear and the trigger 6 does not revert to the initial state. From the source 8 of the control signal will be sent to the indicator 9, which signals the fault of the reconstructed equipment of the discrete automation,.

Thus, the proposed device has broader functionality, namely; it provides control of the health of multistage duplicated protection and the switching mechanism of the switching device.

Claims (1)

The formula of invention. A device for checking the operability of an parameter of discrete automation according to aut. No. 547895, which differs from the fact that, in order to expand the functional capabilities, a block is included that is included between the tested block and the switching device of the switching device, made in the form of two current sensors and a logic element And, with the direct output of the first and inverse output of current sensors through; logical ground AND connected to the second input of the trigger. Sources of information taken into account in the examination: lojABTOpcKoe certificate of the USSR in application number 2095356/07, CL. N 02 H 3 / O4.,