SU714555A2 - Device for testing operability of discrete automatics apparatus - Google Patents

Description

(54) DEVICE FOR INSPECTION OF SPECIFICATION: TI OF DISCRETE AUTOMATIC EQUIPMENT

The invention relates to the field of electrical engineering, in particular, to devices for relay protection and emergency control of electrical installations.

According to the main author. St. No. 547895 a known device for testing the health of discrete automation equipment used to monitor the operability of the relay protection to disable the protected object and without removing the relay protection from operation. This device contains a control source connected via a control key to the indicator, and the block to be checked, connected to the switching mechanism of the switching apparatus, a trigger, one input of which is connected to the control key, an output connected to a test unit and an indicator, and a second trigger input key between checked emym unit and the switching mechanism.,

The disadvantage of this device is that the response time of the automation equipment is not checked. It is known that relay protection is multistage and, under selectivity conditions, each stage operates with equal lag time 21. Deviation of Delay from the required value of 1 results in correct action of the fault and its failure.

This disadvantage reduces the control efficiency and reduces the scope of application of the known device.

The aim of the invention is to increase the efficiency of control and expand its scope. An increase in the monitoring efficiency is achieved by detecting parametric Failures caused by the deviation of the response time of the protection devices from the calculated value. This allows control to be extended to multistep protections.

This is achieved by the fact that a one-shot with a delay element RS and a trigger with an indicator are additionally introduced into the device for checking the health of the equipment of discrete automatics, with this input S of an additional trigger and input of the one-vibrator connected to the forward output of the main

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the trigger, the switching input R of the switching arniapaifa of the optional trigger is connected to the output of the mechanism, and to the output of the synchronizer: and the input is connected to the additional trigger, and the output is connected to the distributor.

FIG. 1 shows a diagram of the device; fig, 2-5 temporary. Diagrams of his work. Accept the following notation. 1 - input unit, 2 - relay protection device, 3 - measuring and logic unit of relay protection, 4 - input relay protection body, 5 - switching device of switching device, 6 - control key, 7 - main control trigger, 8 - source of control signal , 9 - trigger status indicator 7, 10 - one-shot with input delay element, 11 - additional trigger with synchronizer input R, 12 - trigger status indicator P.

The input S of the secondary trigger of the trigger Pi of the one-shot 10 is connected to the direct output of the control trigger 7. The output of the single spreader 10 is connected to the second synchronization input C of the additional trigger 11 Input R of the additional trigger II is connected to the output of the relay protection 2. Indicator 12, signaling a failure protection time is calculated; connected to the forward output of additional trigger II.

In the initial state, the key 6 is open, the main control trigger 7 is in the state O. The indicator 9 is switched off. The signal from the source of the control signal 8 does not come to the relay protection device 2. The relay protection device 2, acting on the switch 5 switch and akku mechanism, is then on from the measuring and logic unit 3 and the input unit 4, is on duty. At its input, a signal is received from the input unit 1, which carries information about the state of the object. 1 On the one-shot 10 and the input of the additional trigger control 11 signal from the main trigger 7 is not received. Single Vibrator reset. Auxiliary trigger 11 is in state O. Indicator 12 is off.

The device works as follows. When the control command is given, the control key 6 is locked and the signal from the control signal source 8 nOcfjMef S of the control trigger 7. The control trigger 7 switches to the state .1, the signal from its direct output goes to the protection input

2 and simultaneously turns on the indicator 9, starts the delay line of the one-shot 10 k and is fed to the input of the additional trigger 11. The additional trigger 11 switches

c in state 1 and turns on the indicator 12 Relay protection 2 operates (if there is no hardware failure) and sends a signal to the switch-off mechanism, input R of the main trigger 7 and input R of the additional trigger 11, simultaneously (if there is no parametric failure) to the input of the additional trigger 11 receives a signal from the one-shot 10. Control trigger 7 switches to state O, turns off the pilot signal source from protection input 2 and turns off indicator 9. At the same time, additional trigger 11 switches to state O and off reading indica-top 12.

Since the signal from protection input 2 disappears, due to the properties of output organ 4, the switch does not turn off. Thus, if the protection is in good condition, the indicators 9 and 12 are briefly switched on for the time of the passing of the control signal through the block 3 and the output organ 4.

An additional trigger 11 returns to its initial state under the condition that the signals from the relay protection 2 and from the one-shot 10 coincide. A time diagram explaining the monitoring process when the relay protection device is in good condition is shown in FIG. 2

If the response time of the relay circuit is not within the specified limits, the signals from the relay protection 2 and from the one-shot 10 at the inputs R and C of the additional trigger do not match and it does not return to its original state. Indicator 12 does not turn off and signals that the response times of the relay protection do not match its calculated setting, i.e. about parametric failure. The time diagrams shown in Fig. 3 and Fig. 4 explain the process of control in case of a parametric failure of the relay protection.

If the hardware failure changes, then a control signal arrives at the relay protection device 2, the latter will not work and the signal at its output will not work. Triggers 7 and II remain in state 1. Indicators 9 and 12 are on and signal a complete loss of protective performance. A timing diagram explaining this situation is shown in FIG. five.

Thus, if the relay protection is normal and its response time is within the specified limits determined by its installation, then during monitoring the indicators 9 and 12 are turned on briefly for the monitoring time. If the protection response time is not within the specified limits, i.e. a parametric failure occurs, then the add-on trigger does not drop and ishchkayur 12

remains permanently on, malfunction signal. In the case of a gutter failure, both triggers (7,11) fail and both indies (9,12) will be lit continuously, signaling an abnormality. The advantage of this device is the possibility of detecting parametric failures of the relay protection and emergency control devices.

The proposed device can be implemented on the basis of elements, serially produced 1st by the industrial standard, its application is reliable, and the reliability of the relay equipment 3i (iiQitbi, improves the control effectiveness, expands its application area. As a result, the uninterrupted power supply of consumers increases and the number of avtoi decreases. and invented a device for checking the health of the network of discrete automation according to auth st.

N 547895, characterized in that, in order to increase the efficiency of monitoring and expanding its field of application, a single vibrator with the element is additionally introduced

delays and RS trigger with an indicator. In this case, the auxiliary trigger and the one-shot input are connected to the direct output of the main trigger, the additional trigger input R is connected to the output of the switching mechanism of the switching device, the additional trigger input C is connected, and its output is connected with indicator.

Information sources,

taken into account in the examination

1. Authors certificate of the USSR N 547895, cl. H 02 H 3/04, 1977.

2. Fedoseev A. M. Relein Protection of Electric Systems M., Energie, 1976, p. 49-50.

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Claims (2)

Formula of the invention A device for checking the operability of discrete automation equipment according to ed. No. 547895, characterized in that, in order to increase the monitoring efficiency and expand its scope, an additional one-shot with a delay element 5 and an RS trigger with an indicator are introduced, while the input S of the additional trigger and the input of the single-shot are connected to the direct output of the main trigger, input R of the additional trigger is connected to the output of the switching mechanism of the switching device, the input C of the additional trigger is connected to the output of the one-shot device, and its output is connected ', with the indicator. , 5 Sources of information taken into account during the examination 1. USSR author's certificate No. 547895, cl. H 02 H 3/04, 1977. 2. Fedoseev A. M. Relay protection of electrical systems M., ’’ Energy, 1976, p. 49-50. Trigger 1 Trigger p X ns Lonely Rotor / O Protection Device 2 -z "ip-3 Indicator 9 Indicator / g δ '7777777777, Trigger 7 77 /// T \ Trigger // 1 1 X cop 77777. . 0 bottom 8 and $ rrator gr ty max Su mi'η ^ // Device protection 2 f — K — Z— ^ A ---- . Indicator 9 77777 FZ indicator . 7 ////////, fig z Fig.Z