SU553552A1 - Device for checking electrical circuit parameters - Google Patents

Description

one

The invention relates to testing electrical prices.

Devices are known that serve to control electrical prices for various parameters 1. Such devices contain software blocks, which leads to complication of the device itself, as well as to the complexity of its maintenance associated with the preparation of the verification program.

Also known are automatic control devices comprising a pulse generator, a measuring unit, a switching unit, and a relay logic circuit capable of detecting the type of fault in the monitored circuits and controlling the operation of the device 2 itself.

Such devices are closest to the described invention, but the technical essence and the achieved result. The disadvantage of these devices is also the need for a test program.

The proposed device allows to check the parameters of electrical circuits without first drawing up a verification program, which shortens the control cycle while simultaneously compiling a table of disconnected circuits on the device display board.

This is achieved by the fact that the device is equipped with a memory unit made on the relay logic elements. The two inputs of each of these elements are connected to the corresponding fixed contacts of various fields of one of the step finders of the switching unit, and the output of each logical element is in the form of a normally open relay contact, activated by the corresponding contact of the input connector to which the field of the same step finder is connected, and common point block measurement.

The drawing shows the scheme of the proposed device.

The device contains a GI pulse generator, a measuring unit R1B, a memory unit consisting of a relay P1-P50, diodes D1-D50,

resistors R1-R50 and transnanrants L1-L50, two step finders I1 and I2, connectors Ш1, Ш2 and elements of the control circuit: relay Р51- Р59, non-switch В1-ВЗ, diodes Д51-Д53, buttons Кн1-КНЗ and lamps Л51, Л52 .

The device works as follows.

The test object is connected to the device through the connectors Ш1 and Ш2, the contacts of which are connected to the corresponding contacts of the stepping switching finders

block and simultaneously to the contacts of the memory block relay.

With this device, three parameters of electrical circuits can be checked: the message of the circuits, the insulation resistance and

strength nzol tspp. Select test mode

carried out using switch B1.

A check on the message of the circuits is made when the switch B1 is set to the position "1. The relay P52 operates, which connects the moving contact of the step finder I1a to the bus “- through the switching contact 1-2-3 and connects the moving contact of the step finder I1 to the bus“ + ”using contacts 4-5. To eliminate the operation of the memory unit relay P1-P50, switch B2 is set to the Manual position.

Using the KN1 button, the step finder I1 is set to the position corresponding to the number of the circuit to be tested, connected to the Ш1 connector. In this case, the voltage will be applied to the circuit through the movable contact I1a, the movable contact I1c will be energized on the corresponding signal lamp, and through the movable contact I1C the inhibit signal will be given to the corresponding memory block relay.

When the KH2 button is pressed, the stepping finder I2 moves to the first position, and its I2SK contacts are closed. Further operation of the step finder occurs automatically along the chain: the bus “- {- R56 / 1-2, I2GC, I2GC, winding I2 bus“ -. When the step finder I2 arrives in such a position that the voltage applied by the finder I1 is present according to the scheme of the object being checked, the relay P56 is activated, which breaks off the price of the self-seeker I2 contacts 1-2 and contacts 3-4 turns on the lamp L52 the presence of a circuit between the contact of the connector Ш1, corresponding to the position of the step finder I1, and the contact of the connector Ш2, corresponding to the position of the stepwise finder I2.

During the translation of the step finder I1 by the button KH1, the next required position of the relay P56 is turned off and closes the self-driving circuit of the step finder I2, which starts working until the next one is found under voltage.

In the same way, the process is repeated until a complete ringing of the inspected object.

To check the insulation resistance, switch B1 is set to position "2, and switch B2 is set to position" Automatic. The relay P53 is triggered, which contacts 1-2 connects the movable contact of the I1C step-type clamp to the busbar, and contacts 3-4 turns on the circuit for monitoring the insulation resistance of the measuring IB unit. After launching the searcher I1, it is set to the position “1. Contact 1 of the tested cable is connected to the output of the IB / 2, and a common point is connected to the output of the PI / 1. The transparency L1 lights up, but the relay P1 does not work, since the prohibition signal from the I1C / 1 contact is given to the diode D1. In the period between pulses from the GI generator, the insulation resistance is measured between the circuit connected to the contact I1a / 1 and the common point. In the event of a positive measurement, the IB outputs co-exits using switch B1. Le P5L Relay P51 contacts 1-2 prepares the turn-on circuit of the relay P57. At the next impulse GI is triggered

relay F, which contacts 1-2 disables the inhibit signal from the first cell of the memory unit. Relay PL is switched on. Relay P1 is blocked by contacts 1-2, which is a memory that the price tested at a given position of the step finder is disconnected, and contacts 3-4 connects the Ш1 / 1 circuit to a common point. At the same time, the node by the action of the GI pulse, the step finder goes to the position “2. At the same time, the L2 and the

It remains to burn the banner L1, which indicates the number of the disconnected chain.

In the second position of the searcher I1, the measurement of the circuits between the contacts Ш1 / 2 and Ш1 / 1, which is connected to a common point, takes place. AT

the third position, with a positive measurement result in the second position, a measurement takes place between the contacts Ш1 / 3 and Ш1 / 1,2 (common point). Similarly, the measurement and collection of fragmented

chains to a common point in all other positions. If some circuit is not disconnected but the circuit of the object being tested or has low insulation resistance with respect to the dialed circuit (common point), IB issues a corresponding signal that turns on the transparency L51, but the P5I relay does not turn on, and at the next The pulse does not turn on the Ry7 relay, and therefore the corresponding memory relay (P1-P50). This value is not connected to a common point and does not participate in the further check. At the same time, the transnarant corresponding to the number of the unshared pricing goes out after the seeker enters the next position

Thus, for one revolution of the step finder, the selection of disconnected circuits takes place, a complete measurement of the insulation resistance between them (each with each), their memorization necessary for the subsequent verification

the strength of the insulation, and on the scoreboard the table of disconnected circuits is highlighted, by which the result of checking the resistance of the insulation as a whole is monitored.

To test the insulation on breakdown, switch B1 is set to position "3. Relay P54 is activated, which by contacts 1-2, 3-4, 5-6 prepares the switching circuits of the relay of the logic circuit (P57, P58, P59).

Step finder I1 is set to position "1.

Since the previous test of the 11/1 circuit was considered disconnected (relay P1 worked), there is a voltage on the I1c / 1 contact,

which includes relay P58. Relay P58 contacts 1-2 turns on relay P59, contacts 3-4 breaks the turn-on circuit of relay P55. Relay P59 with contacts 1-2 locks and turns off relay P1, contacts 3-4 prepares the turn-on circuit for relay P55.

Relay PI contacts 3-4 disconnects the circuit died 1 from a common point, and contacts 1-2 disables the relay P58. The relay P58 with terminals 3-4 includes the relay P55, which connects the measured circuits to the IB with its contacts. Measurement of the insulation strength between the contact Ш1 / 1 and the common point (with all the other dialed chains) occurs. At the next GI pulse, the relay P57 is activated, which by contacts 1-2 unlocks and turns off the relay P59. Relay P59 contacts 3-4 disables the relay P55. In turn, the relay P55 disconnects the measured circuit from the IB. At the same time, the searcher I1 goes to the next position "2, and the verification process repeats, the disconnected circuits from the common point are successively disconnected, and their insulation strength relative to this point is checked. Thus, for the next turn of the seeker, the disconnected circuits are checked for breakdown, eliminated them sequentially from the table of disconnected circuits. If in any position of the seeker I1 the circuit was not disconnected {not recruited according to the table), then in this position the relay P58 does not work, and therefore the relay P55 does not work, and the connection of this circuit to the IB does not occur.

Claims (2)

1. Copyright certificate 221158, cl. Q01 R 31/02, 1964 2. Copyright certificate № 309319 cl. G 01 R 31/02, 1967