SU1076998A2 - Device for checking serviceability of discrete-type automatic equipment - Google Patents

Abstract

DEVICE FOR CHECKING TGS. EQUALITY OF DISCRETE AUTOMATIC EQUIPMENT, auth. 547895, that is, so that, in order to control the reliability, it is additionally introduced a second source of a control signal, a second trigger, a state indicator of the second trigger, the first and / / second element, you And, element OR, connected by the first input to the first input of the first trigger, the first input of the first element And and the first input of the second element And connected by an output to the input of the second trigger status indicator, and the second input with the inverse output of the second trigger connected via direct output via second the source of the control signal to the output of the protected block, with the first input of the second trigger connected to the output of the first element AND, and the second input to the output of the OR element connected by the second input to the second input§ of the first element And and the second input of the first trigger.

Description

ABOUT

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about about

00 The invention relates to electrical engineering, namely, to relay protection devices and emergency automation of electrical installations, and can be used to monitor the health of discrete automation equipment without disconnecting the protected object and removing the relay protection from operation. According to the main author, No. 547895, a device for checking the health of discrete automatics equipment is used to monitor the health of relay protection without disabling the protected object and without removing the relay protection from operation and containing a source of control signal connected via a control key trigger and verifiable block associated with the switching mechanism of the switching device. In addition, the device contains a trigger, one input of which is connected to the control key, the output is connected to the checked block and trigger status indicator, and the second trigger input is connected between the checked block and the switching mechanism of the switching device 1. A disadvantage of the known device is that the setpoint of operation of the measuring logic unit of the relay protection is not verified. In operation, spontaneous changes of the setpoint are possible (aging of elements, breakage of circuits in the circuit of measuring bodies). This leads to incorrect operation of the protection — triggered in the mode without short circuit or when an external short circuit, i.e. to failure of protection, false or excessive triggering. The prior art device only detects setpoint deviations that lead to a failure in response. Deviation of the setpoint, leading to false or redundant actions, it does not detect, which reduces the reliability of the control and limits its functionality. The purpose of the invention is to increase the reliability of the control. This goal is achieved by the fact that in the device for checking the operability of discrete automatic equipment, the second source of the control signal, the second trigger, the state indicator of the second trigger, the first and the second element AND the OR element connected by the first input to the first input of the first the input of the AND element and the first input of the second element AND connected with the input of the state indicator of the second trigger, and the second input with the inverse output of the second trigger connected th output through a second power control signal to the output unit to be protected, the first input of the second flip-flop connected to the output of the first AND gate and the second input - to the output of the OR gate, a second input connected to a second input of the first AND gate and a second input of the first flip-flop. The drawing shows a block diagram of the proposed device. The proposed device contains a protected block 1, a relay protection device 2, a relay protection measuring logic unit 3, an output element 4, a switching mechanism 5, a control key b, a first trigger 7, a first control signal source 8, an indicator 9: the first trigger, the second trigger 10, the second indicator 11 of the second trigger, the second source 12 of the pilot signal, the first 13 and the second 14 elements AND, as well as the OR 15 element. In the initial state, the control key 6 is off, the control trigger 7 is in the O state. Indicator 9 you the key. The relay protection device 2 control signal from source 8 is not received. The second trigger 10 of the control is in the state O. The indicator 11 is off. In the source 12 of the control signal is not excited and from him to the device 2 relay protection control signal is also not received. Relay protection device 2 acting on switching mechanism 5 and. consisting of the measurement logic unit 3 and the output unit 4, is in the duty mode. At its input comes a signal from unit 1, carrying information about the state of the protected object. The device works as follows. When the Control command is given, the control key b is closed and the signal from the source 8 of the control signal is fed to the first input (S) of the trigger 7, while the latter switches to the state. Indicators 9 and 11 are turned on. In the event that the control signal has a level above the response threshold of the measuring unit 3, the relay protection device 2 is activated (if there is no refusal to operate.) And sends a signal to the switching mechanism 5, the second input R of the trigger 7 and input element And 13. The trigger 7 switches to the state O and turns off the source of the control signal. Returns to the initial state of the device 2 relay protection. The indicator 9 is turned off. The signal from the input of the relay protection device 2 disappears, but the switch does not turn off. At the same time, the trigger 10 of the control switches to state 1, since both elements of the element And 13 are present 1. The indicator 11 is turned off. At the same time, the source 12 of the control signal is energized.

If the control signal has a level lower than the response threshold of the measuring logic unit 3, the output of the relay protection device, if it is normal, the signal does not appear and the trigger 10 remains in state 1, and the indicator 11 in the off state condition. If the relay protection device is defective, a signal appears at its output, resetting trigger 10 through element 15. This activates indicator 11. The control signal source 12 and the relay protection device return to their original state. The signal from the input of the device 2 relay disappears. But you are the key; does not turn off.

When you remove the control command, all items return to their original state.

Thus, if the protection is in good condition, the indicators 9 and 11 are briefly turned on only for the duration of the test signals. If the protection has a failure to respond, the indicators 9 and 11 do not turn off and the monitoring stops. If the protection has a failure type of False Response or Excessive Response remains on only, indicator 11.

5 Thus, the proposed device provides increased reliability of control, as a result of the possibility of detecting all types of failures of relay protection devices, as well as

Q expansion of the field of application, since it is possible to use a monitoring device to detect the propensity of the Failure Protection; , type Overkill.

Claims (1)

DEVICE FOR CHECKING THE FEATURES OF THE DISCRETE AUTOMATIC EQUIPMENT by ed. No. 547895, about t - -l and moreover, in order to increase the reliability of control, a second control signal source, a second · ”· swarm trigger, an indicator of the state of the second trigger, the first and. the second element is,, you AND, the OR element, connected by the first input to the first input of the first trigger, the first input of the first And element and the first input of the second And element, connected by the output to the input of the status indicator of the second trigger, and the second input - with the inverse output of the second trigger connected by direct output through the second control signal source to the output of the protected unit, the first input of the second trigger connected to the output of the first AND element, and the second input to the output of the OR element connected by the second input to the second input do <§ of the first element And and the second input of the first trigger.