SU568910A1 - Device for automatic inspection of electric circuit parameters - Google Patents

Description

The device works as follows.

On the first command from the unit /, relay 5-1 is turned on. With its switching contact, it connects the switching group Il to the DSP circuit. With the second command, the relay is turned on 7-1 and with a contact, connects the controlled day 8-1 to the DSP. By the third command, 1VK “makes a 6-2 relay and connects the controlled circuit 8-2 to the DSP with its contact. As a result, the disconnected circuits 8-1 and 8-2 are connected to block 2. Next, at the command of block 1, the insulation resistance is measured. E: If the value of the insulation resistance is within the limits of invalid values, the verification process is terminated and the command is issued to turn on the corresponding signal in block 3. If the value of the insulation resistance turns out to be permissible, then through a command from the / block, under the condition that there are branches in circuit 8-2, it is checked by dialing the reliability of its connection to the DSP. If the 8-2 circuit is single, then according to the command from block 1, the relay 6-2 is reset, and the rel-7-2 is triggered, remaining in the on state, as a result, the circuits 8-2 and 8- / are combined in the DSP circuit.

When a new command is received from block 1, a 8-3 circuit is connected to the DSP. After checking this circuit with respect to the combined circuits 8-.1 and 8-2 and the absence of unacceptable deviations in the resistance of the insulation, as commanded by unit 1, it is disconnected from the DSP and connected to the DSP, remaining in this position. The process is then repeated and, for testing, monitored circuits are connected in series to the CCT. Then, at the command from block 1, the 5-U relay is turned off. As a result, the switching group ii is disconnected from the DSP circuit, and all the monitored circuits within this group, i.e., the circuits 8-1-S-tn remain connected to the DSP circuit. Further, at the command from block 1, relay 5-2 is turned on, the process is repeated for the switching group g. After completing the test, all circuits in this group are commanded by the unit / process is repeated for subsequent switching groups up to r. .

For the purpose of illustrating the advantages of the proposed device, an example of testing three disconnected chains having branches in the form of chains 8-1, 8-6 is considered. By the first command from the unit /, the relay relay 5-1 is turned on, as a result of which the tested circuits are prepared for testing by unit 2. With the following commands from the unit / relay 6-1, 6-2 is activated and the unit 2 is measured by the circuit: DSP - relay 5-1 - relay 6-1 - circuit 8-1 and 8-2 - relay 6-2, and if the resistance value is within acceptable limits, the monitored circuits 8-1 and 8-2 are in reliable contact.

Further, on commands from the unit / relay 6-1 and 7-2 are released, they remain on the memory and the circuits 8-3 and 8-4 are connected to the DSP using the relay 6-3. On a command from the unit /, the insulation resistance between the disconnected circuits 8-1, 8-4 is measured. If the value of the insulation resistance is within the limits of non-tolerable values, the verification process is terminated. A command is issued to turn on the corresponding signal in block 3. If the value of the insulation resistance turns out to be permissible, then, at the command of unit 1, relay 7-4 turns on and the presence of contact of the monitored circuit 8-3 and 8-4 pro is checked by ringing, and a circuit is formed: DSP-relay 5-1 - , relay 6-3 - controlled circuit 8-3 and 8-4 - relay 7-4. If the resistance value is within the range, then the controlled circuits 8-2 and 8-3 are in contact.

Further, on commands from the unit / relay 6-3 is released, and relay 7-4 remains on the memory. Then, at the command of the unit /, relay 6-5 is turned on and a circuit 8-5 and 8-6 is connected to the DSP. The command from block 1 measures the insulation resistance between the disconnected chains 8-1-8-6. After measuring the value of the insulation resistance, the reliability of the contact between the chains 5-5 and 8-6 is checked. This completes the verification process.

The use of the proposed device allows, in comparison with the known device, to significantly increase the reliability of the control. In addition, the device for automatical monitoring of electrical circuit parameters uses one-contact high-speed relays using magnetically controlled contacts (MK-27-3), which increases labor productivity and allows an increased test voltage to be applied (for example, when checking printed circuit boards). ).

Claims (2)

1. A device for automatic monitoring of electrical depot parameters, for example, insulation resistance values, containing controlled circuits combined into groups, a control unit, the first output —which is connected to the measuring unit, the second output — to the first input of the alarm unit, and a third output of the control unit is connected to the commutating and isolating relays, the second input of the alarm unit is connected to the measuring unit connected through direct and feedback circuits to the contacts of the isolating relays, characterized in that spruce enhance the reliability of measurement, each controlled circuit is connected to the two normally open contacts of the switching relay, which second contacts are connected through normally closed contact and a relay decoupling circuit connected € obratEoy measuring communication units. 2. The device is used in accordance with claim 1, so that the number of initiating relays is chosen from the condition of the permissible leakage current of the com-5 mutation groups. The source of information taken into account in the examination: 1. USSR Author's Certificate No. 385242, cl. G 01 R 31/02, 1971. -one Ptjz