SU530280A1 - Control software for wiring correctness - Google Patents

Description

It is also known a device comprising a switch connected to the inputs of the monitored product and a program block, a measurement block and one output of the power source, and diode keys of two zener diodes and one resistor each. This device is closest to the invention by its technical essence and the achieved result. The aim of the invention is to increase the accuracy of measurements by equalizing the positive and negative half-waves of the supply voltage when testing an electrical breakdown. This goal is achieved by connecting a zener diode connected by an anode to a power source between a common bus connecting all resistors and a power source with a stabilizing voltage equal to the stabilizing voltage of the stabilizers connected to the product being tested. The drawing shows a diagram of the described control software. As a control device, a system of diode keys 1 is used, each of which consists of one resistor 2 5 and two zener diodes 6-9 and 1О-13. The stabilization voltage of the zener diodes should correspond to the following equality: 0.8 and, (6-9) and (10-13). Each of the zener diodes 6-9 is connected to the contacts 14-17 of the switch and terminals for testing the evioro of the product 18. Each of the zener diodes of the Yu-13 is connected to the contacts 19-22 and the terminals of the software plate 23, on which jumpers are assembled with a program imitating the tested product. The switch contacts are switched in pairs and alternately (14 and 19, 15 and 20, etc.). All resistors 2-5 are connected by a common bus and through the Zener diode 24 are connected to the source. A brush 2 5 of the power switch is connected to the common power supply, and a brush 26 is connected to the resistor 27 and the input of the threshold amplifier 28. The output of the amplifier 28 is connected to a lamp 29 signaling about the problem of isolation Zener diode 24 serves to equalize the negative half-wave of the

with a positive half wave

by. Noah.

With a negative voltage half-wave and j. The scheme works as follows.

The zener diodes 10 and 11 will be shifted in the right direction and, and current will flow through them and through resistors 2 and 3. The zener diodes 6 and 7 will be locked, the current through the brush 26 will flow through the following circuits:

- voltage stabilization

st

3.9

8.9 zener diodes;

  ca. voltage across zener diode 24 at forward bias.

 and

and and

Since -dd-gd

ST

st

Z48, 9

then the first parts of both equations will be equal, which testifies to the fact that the error during testing of electrical installation on the breakdown is minimized. busbar power supply U p ,, resistor 27, brush 26, insulation resistance, zener diodes 8.9, biased in the forward direction, resistors 4.5 and through the punched Zener diode 24 to the power supply (Jr, p Voltage applied The product to be tested will be determined by the formula: i -m + i5 27 1.3 U8, Y, is the current flowing through the resistor 27, proportional to the value of the insulation resistance; D and g (- voltage drop on the zener diodes 8, 0 at forward displacement; i. - voltage stabilizing the stabilization of r4 litron 24; and - voltage applied to testing the number of terminals in the tested voltage is the resistance value the resistive value of the resistor of the key. With the opposite polarity of the supply voltage - U the circuit works as follows. Stabilized; and 11 will be punctured and through them both resistors 2 and 3 will flow current, since the stabilization voltage of Zener diodes 10 and 11 is less than the stabilization voltage of Zener diodes 6 and 7: the latter will be locked and a current proportional to flow through the resistor 27. The value of resistance and tion ol. The magnitude of the voltage applied to the test product will be determined by the formula: U Unp. .T-JM, Ti- (Tn - i)