SU809069A1 - Device for testing operational gaps in electromagnetic relay - Google Patents

Description

one

The invention relates to electrical measuring equipment, in particular, to devices for converting and measuring non-electrical quantities using electromagnetic and electronic devices.

Devices are known for monitoring the moment of movement of the electromagnetic relay 1.

However, in such devices a limited number of parameters are controlled.

It is also known a device for monitoring the operating gaps of an electromagnetic relay, which contains a power source, a measuring transducer having one input and one output and designed to sense the effect of the test relay, memory cells, a multi-input measurement unit for relay parameters and a start button, in which (|) The moment when the core stops is measured and the movement of the core is measured from the moment the contacts are closed to the moment when the core 2 stops.

The disadvantages of this device are the dependence of the readings of the recording device on the supply voltage of the winding of the relay under test, i.e. on the speed of the core, which is clearly non-linear

character, and when a device chooses a narrow task, from measuring and dropping the contact pressure only at the closing contact, whereas in practice it is necessary to measure all the main working gaps of the relay: the dip and contact pressure of the opening and closing contacts, the contact solution and the core stroke throughout it range. In addition, the block for removing the current pulse of the winding of the relay for monitoring the moment of stopping of the core has a large fault if the relay under test is slow acting, for example, having copper sleeves on the cores.

The purpose of the invention is to expand the ability to control the working gaps of the electromagnetic relay.

The goal is achieved by the fact that a device for controlling the working gaps of an electromagnetic relay, which contains a power source, a measuring transducer having one input and one output, is designed to perceive the effect of the test relay core, memory cells, a multi-input measurement unit of the relay parameters and a start button, introduced trigger trigger measuring transducer, the key element of the measuring transducer having two inputs, the recorder of the moment of stopping of the cor, having two inputs and two outputs, triggers for monitoring the moment of measuring the state of the closing and opening contacts of the test relay, key elements associated with the corresponding triggers for monitoring the moment of measuring the state of the contacts of the tested relay, and a key element for controlling the stop of the core and having two inputs that store cells for monitoring dips of break contacts, memory cells for controlling the working gap between the core and the pole tips of the test relay, having one input and two outputs, which stores a cell for monitoring closing contact solutions in the initial core position, having one input and three outputs, two-input adders for monitoring contact solutions of the tested relay and closing contact dips, and a time delay unit, the output of the key element of the measuring transducer, one of the inputs of the key elements associated with the triggers controlling the moments of change of the state of the closing and opening contacts, as well as the key element intended to started to control the stop of the core, the output of this key element is connected to the input of the storage cell controlling the working gap between the core and the pole lugs of the test relay, one of the outputs of the specified memory cell is connected to one of the inputs of the two-input adder to control the contact contact dips, another output of the same memory the cells are connected to the multi-input measuring unit of the parameters of the relay; the output of the two-input adder for controlling the closing contact dips is connected to the multi-input CB relay unit measuring parameters output key member associated with the trigger control moments measuring state of the switching contacts is coupled to the input of the memory cell to control the switching contacts of the solution in the rest position of the armature, one of whose outputs is connected to another input of the two-input adder for. monitoring the failures of the closing contacts, and its other output is connected to one of the inputs of the two-input adder for monitoring solutions of the contacts of the test relay, the third output of the specified storage cell is connected to the multi-input measuring unit of the relay parameters, the output of the key element connected to the trigger for monitoring the timing of opening contacts the test relay connected to the input of the memory cell to control the failure of the break contacts, one of the outputs of which is connected to another

an input of a two-input adder for monitoring solutions of contacts of a relay under test, and its other output is connected to a multi-input measuring unit of relay parameters; one of the inputs of the recorder stopping moment recorder is connected to another input of a key element designed to monitor the stopping of the relay; another recorder output is connected to one of the inputs trigger trigger measuring transducer, the output of which is connected to the unit

time delay and one of the inputs of the key element of the measuring converter, the other input of which is connected to the output of the measuring converter, another input of the switching on trigger of the measuring converter is connected to the start button, the output of the time delay block is connected to another input of the recorder of the moment of stopping cor and one of the inputs of each trigger control of the moments of state change of the closing and opening contacts, other inputs of the specified flip-flops are intended for connection respectively make and break contact of the test relay.

FIG. Figure 1 shows the structural electrical circuit of the device proposed;

in fig. 2 is a graph of output versus time movement.

Test relay 1 is energized from the power source through start button 2. The relay anchor is connected to the measuring

A P converter (PI) 3, in which the sensor 4 and the signal conversion unit 5 are input. The signal from the output of the measuring converter is fed to one of the inputs of the key element 6.

The task of converter 3 is to realize the functional and linear connections between two physical quantities — the physical gap of the relay and the voltage at the output of the converter. The principle of operation of the measuring transducer is based on the eddy current effect. In this case, it is possible to use converters of another type that would solve a similar technical problem in the device. The working clearances are measured during the operation time of the electromagnetic relay. Consequently, the dynamic characteristics of the converter and memory cells that record and store information about the value of a parameter determine the capabilities of the device for measuring the parameters of high-speed relays. Measurement of parameters with sufficiently high accuracy is achieved with a relay response time of more than 1.5 ms. The fixture corresponding to the moments of opening or closing of contacts of the coordinates of the core, represented by a certain voltage value at the output of the PI, can determine various working gaps of the relay: dip (joint stroke) of the contacts, solution between the contacts, contact pressure, working gap between the bark and pole pieces and Another point and in FIG. 2 corresponds to the moment of opening of the opening contact, point b to the moment of closing of the closing contact, point C to the moment when the cor. The other input of the key element 6 receives a signal from the trigger 7 for switching on the measuring transducer 3. The inputs for trigger 7 are connected to the recorder 8 of the moment of the cor cor and to the start button 2. One of the inputs of the recorder 8 receives a signal from the key element 6. The contacts 9 of the relay 1 are connected to the input of triggers controlling the moments of their change of state. So the normally open contact is connected to one of the inputs of the trigger 10 control of the shorting contact, and the normally open contact is connected to one of the inputs of the trigger 11 of the control of the normally open contact. A signal from the output of the key element 6 is also fed to one of the inputs of the key elements 12-14, which are associated with the corresponding triggers controlling the state of the contacts of the tested relay. The second input of the key element 14, designed to control the stopping of the core, receives a signal from the recorder 8. The second input of the key element 12 is connected to the trigger 10 to control the moments of change of the contact contact state, and to the second input of the key element 13 a trigger signal 11 is applied. change the state of the break contact. The outputs of the key elements are connected to the storage cells 15-17, and the output of the key element 14 is connected to the storage cell 17 to control the working gap between the core and the pole tips of the relay under test, the output of the key element 12 is central to the storage cell 16 in the source The position of the core and the output of the key element 13 is connected to the memory cell 15 to control the failures of the closing contacts. One of the outputs of the memory cell 15 is connected to a two-input adder 18, where one of the outputs of the memory cell 16 is also connected. One of the outputs of the memory cell 17 and the other of the outputs of the memory cell 16 are connected to a two-input adder 19. Other outputs of the memory cells 15 and 17 and the third the output of the memory cell 16 is connected to the multi-pass relay measurement unit 20. The input of the time delay unit 21 receives a signal from trigger 7, and its output is connected to another recorder input 8 of the moment the core stops and to one of the inputs of triggers 10 and 11 of the control of the measuring moments of the NIN state of the closing and disconnecting contacts 9 of the tested relay 1. After pressing the starting button 2 in the winding of the relay-1 current flows. When the closing contact of this button, connected to one trigger input 7, is opened, the latter is activated and opens the key 6 of the measuring transducer 3. The time delay unit 21 does not respond to this change in the state of the trigger 7. From the moment of pushing the test relay core, the voltage from the IP 3 output, proportional to the core or contact movement, goes to the recorder 8 input of the relay core moment and to the inputs of key elements 12-14. In the initial state, the triggers 10 and 11 and the recorder 8 are in such a position that the key elements 12-14 are open. Therefore, the voltage from the output of the PI 3 through the key elements is fed to the inputs of the storage cells 15-17, made, for example, according to the circuit of an integrating amplifier with a resistive negative feedback. At the moment of opening of the opening contact 9, the trigger 11 changes its state and turns off the key element 13, as a result of which the voltage at the output of the memory cell 15 is proportional to the value of the failure of the opening contact. At the moment of closing the closing contact, the trigger 10 changes its state and turns off the key element 12, and at the moment the core stops, the recorder 8 changes its state, turning off the key element 14. Therefore, at the output of the adders 18 and 19, the voltage equivalent the solution between the contacts and the working gap. The voltage from the outputs of the cells 15-17 is fed to the inputs of the unit 20, where they are compared with the reference nominal value of the corresponding parameter, measured by digital and measuring instruments and recorded, if necessary, using a digitizer. The parameters of the contact solution during the flight of the core and the failure of the closing contact are obtained with the help of adders 18 and 19, as a result of subtracting the output voltages of the correspondingly storing cells 15 and 16, 16 and 17. The resulting voltages equivalent to the values of parameters are also fed to the inputs of block 20, where they are processed in the order above. After stopping the relay, recorder 8 is activated, which causes triggering of trigger 7 in the opposite state. In this case, the key element 6 is turned off and removes the voltage of the signal of the measuring converter from the inputs of the cells, and the voltage from the trigger 7

1) a time delay to the input b; 1 21 of the time delay, the setting of which is adjustable by the operator.

The block 21 processes and supplies a reset pulse to the inputs of the 10 and I and reinster1 and the trigger 8, and drives them to their initial state. PP ;; THIS key elements 12-14 o open and information, cells 15-17, are erased behind a storage capacitor; a hidden key element for combining feedback of an integrating cell amplifier {fig. 1, this circuit is not shown). Thus, I remember :; , iHii cells in normal idle state can not receive charge and sauaHUieHbi: i cant be affected by random interference. In order to obtain information on the purpose of the parameters, it is necessary to return the start button to its initial position, reset the information, de-energize the relay and repeat the measurement cycle as described above. The reset of the block 20 is carried out, similarly to the reset of the trigger 7, at the moment when the start button is pressed to the "measurement of parameters" position.

It is noted that in the device, by means of various methods, the Ij and il triggers and the recorder 8 are protected from vibration of contacts or a relay core. The triggers SO and li are triggered by the first closure of the contact, and peii-iCTpaTop 8 is triggered by the first moment that the derivative of the function at zero is equal to zero.

ZI ... iH 1 The snapshots of the working gaps. Multi-contact relays additionally, each KoiiTaKT is inputted to a trgge-N) 10 and P contact; , -. 9, key elements 12 and 1: zon.mi;: a; common cells 15 and 16 and two-input service stations 18 and 19. These elements are connected and work in a circuit similar to the first triple contact .

Thus, the proposed device is designed with high accuracy in time to trigger relays to obtain the linx information of all the working gaps of the relay, with: me of contacts and for any correlating cor.

Claims (2)

1. USSR author's certificate number 190485, cl. H 01 H 49/00, 1956. 2. USSR author's certificate No. 190484, cl. H 01 H 49/00, 1956 (prototype).  I - i u  | g Fi, g.2