SU1053181A2 - Device for checking serviceability of discrete-type automatic equipment - Google Patents

Abstract

DEVICE FOR CHECKING THE CORRECTION OF DISCRETE AUTOMATIC EQUIPMENT BY AUTH. St. 966805, characterized in that / in order to expand its area of application by extending a test for protection whose intrinsic response time is shorter than the return time of the time delay element, an inverter and an element are added to it, and one of the inputs is cb & kipka through the inverter with the output element of the exposure time-. No, the second input. with the closing contact of the control key, and the output element And is connected to the dynamic input of the trigger control. (L D1 from 00

Description

The invention relates to electrical engineering, in particular, to relay protection devices and anti-emergency automation (RZA) of electrical installations and can be used, 9 for monitoring the operability of discrete automation equipment, such as relay protection devices, without disabling the protected object and without remove rech from work.

On the main auth, sv. No. 966805 a known device for checking the operability of discrete automatics equipment, used to monitor the health of the relay protection, without turning off the protected effect and without removing the relay protection from operation, containing a control signal source connected via a control key to one input of the signal tripper, the output of which is connected to the indicator and verifiable. the unit connected to the input unit connected to the switching mechanism, the second input of the trigger signal is connected to the output of the tested unit, a time delay element whose input is connected to the output

 the OR gate, one input of which is connected with the output of the tested block, and the second input through the opening contact, of the control key is connected to the source of the control

. signal output

The time is connected to one of the inputs of the element And through the current sensor is connected to the output of this element and the switching mechanism, the second input of the element And is connected to the output of the checked up block, the input of the indicator is connected to the output of the current sensor.

The known device functions correctly in those relay protection devices in which the time of return of the time element of the monitoring device is shorter than the response time of the tested protection unit. Recently, however, new types of electronic high-speed protections have appeared, in which their cumulative time is less than the return time of the holding element. time control device. This limits the scope of application of the known device.

The purpose of the invention is to expand the field of application of the device by extending the protection control to an intrinsic response time of which is shorter, while the return time of the ele- ment is delayed.

This goal is achieved by the fact that in the TV U service, to verify the health of the equipment of discrete automation, an inverter and an I element, one of the inputs of which is connected via an inverter, are introduced in addition.

the output of the time delay element, the second input from the base: the control key contact, and the output of the AND element. Connected to the dynamic trigger input of the control panel.

The drawing shows the f / function of the proposed device. The device contains an input unit 1, n {) an overlay 2-relay protection block consisting of a measuring-logic block 3 of relay protection and after, in conjunction with it, a connected output body 4 of relay protection, switching mechanism 5, control unit 5, control trigger 7, control signal source B, control trigger state indicator 9, element OR 10, time delay element 11, AND element 12, current sensor 13, sensor state indicator 14

current / disconnecting contact 15 of the control key, closing contact 16 of the control key additional element And 17, the inverter 18.

One of the inputs I and 17 is connected through the inverter 18 with the output of the time delay element. The second input element I is connected to the closing contact 16 of the key 6 of the control. The output element And 17 is connected to the dynamic input of the trigger control 7.

In the initial state (in the absence of the command Control II. KEYL control is turned off. When contact 15 is closed, and contact 16 is open, control trigger 7 is in state 0 indicator 9 is turned off. The signal from source 8 of the control signal to device 2 relay protection does not come in. Device 2 relay protection acting through the element AND

12 to the switching mechanism of the switch 5 and consisting of the measuring logic unit 3 and the output organ 4, to: it is on duty. A signal arrives at its input.

from the input unit 1, carrying information about the state of the protected object. The control signal from the source 8 through the closed contact 15 of the control b key is fed to the element OR

10 and from its output to the input element 11 time delay, which at. This will be in a workable: state. The control signal from the direct output of the time-delay element 11 through the current sensor 13 enters the circuit of the switching mechanism 5. The level of the control signal is selected so that the integrity of the electrical circuits of the switching mechanism 5 is checked without

its triggering.

With a good switching mechanism 5, the Tofta sensor 13 is in the excited state and the indicator 14 is turned on. If the chain

control mechanism 5 switching

faulty; if there is an open circuit or an unacceptably high resistance, then the current sensor 13 does not work and the indicator 14 will be turned off, indicating a malfunction. Simultaneously, a signal from the direct output of the time delay element 11 is fed to one of the inputs of the element 12. The second input of this element is connected to the output of the test of device 2. The signal from the output of the time 11 element through the inverter 18 enters the input of the AND element 17 and prohibits his work.

When an emergency condition of the protected object occurs, the device 2 of the relay protection is activated. em and sends a signal to the input of the element 12. At the second input of the element, there is already a signal of the time-delay element 11. Therefore, the signal from device 2 without any delay passes through the element 12 to the switching mechanism. .

The device works as follows.

The control command is given by the switch of turning on the control key b, the normally closed contact 15 of which is then opened and the normal one.

but open contact 16 is closed. The control signal through the element OR 10 to the input element of the time delay is interrupted

and the delay time switch is turned off, and the control signal through the current sensor 1.3 to the switching mechanism circuit is stopped. Current sensor 13 and indicator 1 are turned off. The signal at the input of the logical element AND 12 from the element 14 of the time delay disappears. At the same time, the signal from inverter 18 at the output of element 11 is interrupted; At the same time, the control signal from the source 8 of the control signal through the element 17 to the trigger input 7 is prohibited. The signal from the source of the control signal 8 through the contact 16 of the control key 6 and the element 17 is fed to the input of the trigger 7 ,. The control trigger 7 switches to state 1, the signal from its direct output enters the protection input 2 and simultaneously turns on the indicator 9. Thus, the control signal is sent to the protection input 2. It is resolved only after the time delay element passes failed condition.

Relay protection 2 is activated (if OK), and gives a signal to

input elements OR 10i. And 12 and simultaneously on the R trigger trigger 7 control. The signal from the relay protection device 2 to the switching mechanism 5 can flow through

the time determined by the setting of the element 11 time delay, as the second input of the logic element And 12 signal: from the element 11 time delay is missing. Time

act element 11 shutter speed. time is chosen longer than

device return time 2.

The control trigger 7 switches to the O state and turns off the control signal source 8 from the protection input 2 and turns off the indicator 9. The relay protection 2 returns to the initial state. Element 11 time exposure does not work, so

how is the response time longer

relay protection return time 2. The switching mechanism will not turn on. Thus, the control signal is given only after returning to the uncracked state of the element .11,

if it is checked, the protection is intact, the indicator. 9 is switched on briefly for the time of the pilot signal, and the control is not accompanied by the operation of the switching mechanism 5. If not operational, the control signal through the block 3 and the output body 4 to the output of the relay protection device 2 n-passes, the trigger 7 is not transferred and the puller 9 remains permanently on. If the switching mechanism 5 is operational, then the current sensor 13 and the indicator 14 are on. If switching mechanism 5 is faulty,: fo current sensor 13 and indicator. 14 off. ; - -.

When using the proposed device, the reliability of the control, which consists in preventing the possibility of false triggering of the switching mechanism during control, is increased, the scope of application is expanded. Nor does it include a proliferation control monitoring institute whose intrinsic response time is less than the return of the time element of the monitoring device.

Claims (1)

DEVICE FOR CHECKING THE DAMAGE OF DISCRETE AUTOMATIC EQUIPMENT by ed. St. No. 966805, characterized in that, in order to expand the scope of its application by extending the protection test, whose own response time is less than the return time of the time delay element, an inverter and an I element are added to it, one of the inputs of which is connected through the inverter to the output of the element time delay, the second input is with the closing contact of the control key, and the output of the element And is connected to the dynamic input of the control trigger.