RU1807456C - Device for testing relays - Google Patents

Abstract

The invention relates to measurement technology and can be used to categorize relay groups. The aim of the invention is to increase the reliability of control results. The device contains two NO elements, a trigger delay element, a key element, two indicators. 1 ill.

Description

The invention relates to automatic control devices and can be used to verify the operability and timing of electromagnetic relays.

The purpose of the invention is to increase the reliability of control results.

The drawing shows a diagram of a device containing a winding 1i-1k, opening 1i-1 -1k-1 and closing 1i-2-1k-2 contacts of monitored relays, the first 2 and second 3 elements NO, RS-trigger 4, delay element 5, key element 6, first 7 and second 8 indicators, and - the first inputs of the elements NO 2 and Z / in - the second inputs of the elements NO 2 and 3.

The device operates as follows.

Before starting work, the RS flip-flop 4 is brought to its initial position (there is no signal at the output) by supplying a signal to the R-input from the installation input of the device. The operation of the device begins with the inclusion of a key 6, which supplies an electrical signal to the device circuit. If the monitored relays are operational, there is no signal at the input to and is present at the input a and the output of the element NO 2. The appearance in this case of the indication on indicator 7 indicates the operability of the monitored relays. The logic of operation of elements NO 2 and 3 is shown in the following table.

The technical implementation of the NO element on various types of elements (relays, transistors, diodes, ICs) does not cause difficulties, because voltage surges even when switching the windings of outdated relays (the dynamic resistance of the inputs of the device's ERI is 20-50 Ohms) of the type RES22, RES6, etc. do not exceed 1-3 V, and modern relays of the RES49, RES60 type (power consumption - milliwatts) or reed switches (power consumption - microwatts) will cause 1V voltage surges. High-voltage transistors and ICs have a rated value of the maximum working voltage of 250 V .

If the monitored relays are operable and the response time does not exceed the maximum permissible value equal to the delay time of element 5, then the signal at input a of element NO 3 appears earlier than at input at, and signals at the output of element NO 3 appear at the S-input and output of the RS-flip-flop 4. The appearance in this case of the indication on indicator 8 indicates that

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controlled relays are operable and their response time does not exceed the maximum permissible value.

If the monitored relays are operational and their response time exceeds the maximum permissible value equal to the delay time of element 5, then the signal at the input to element NO 3 appears earlier than at input a. At the same time, there are no signals at the outputs of the element NO 3 and RS-trigger 4. The absence in this case of an indication on indicator 8 when there is an indicator on indicator 7 indicates that the monitored relays are operational, but their response time exceeds the maximum permissible value.

If at least one of the monitored relays is inoperative, i.e. if not once, at least one of the contacts 1i- i - 1k-1 or. if at least one of the contacts 1 i --2 -1 to -1 fails, there is no signal at the output of the element NO 2. The absence in this case of indication on indicator 7 (and also on indicator 8) indicates that in the group controlled relays have at least one inoperative.

The device's ability to register the maximum permissible response time of monitored relays makes it indispensable in a whole series of practical cases. This property allows the implementation of fundamentally new, more efficient control algorithms for complex systems and technical processes.

The presence of an indication for any operational types of state of the monitored relays allows reducing the number of erroneous monitoring results by at least one order. The presence of two indicators in the device allows timely detection of failures and ensures the highest possible level of operational reliability. This is optional

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increases the reliability of control results.

The device has a minimum implementation time of the control process. In fact, the process of monitoring high-quality relays can be completed with the indicator 8 on, i.e. In this case, the duration of the monitoring process from the moment of switching on to the moment of switching off the key 6 can be measured in units of seconds. This indicates a high productivity of the device and the minimum amount of electrical energy consumed by it.

Claims (1)

SUMMARY OF THE INVENTION Relay monitoring device comprising a delay element, a first indicator, a power source, wherein, in order to increase the reliability of the monitoring results, an RS trigger, two NO elements, a second indicator and a key element connected to the first output to the positive pole of the power source, and the second output through the series-connected windings of the monitored relays to the negative terminal of the power source and to the first terminals of the first and second indicators, the second terminal The element is also connected to the first terminals of the NC contacts of the group of monitored relays, to the input of the delay element and through the series-connected NC contacts of the group of monitored relays to the first input of the first element NO, connected by the second input to the second terminals of the NC contacts of the group of monitored relays, and the output With the second the output of the first indicator and with the first input of the second element NO, connected by the second input to the output of the delay element, and the output to the single input of the RS-trigger, connected direct output with the second output of the second indicator, the zero input of the RS-trigger is the installation input of the device,