SU761947A1 - Apparatus for monitoring direct-current electric circuits - Google Patents

Description

The invention relates to electrical engineering and can be used to monitor the operability of electrical installation and the operability of functional elements when checking electrical engineering devices.

A device is known in control systems for determining the presence of a signal in electrical circuits, containing positive and negative buses connected to a DC source, signal relays, the contacts of which are included in the £ 13 indicator circuit.

It is also known a control device containing a transistor amplifier, the 15th input of which is through decoupling. the diodes and the voltage divider are connected to monitored circuits, and the amplifier output is connected to the first signal relay, the second signal relay is connected through isolating diodes to monitored circuits (£ 2].

A disadvantage of the known devices is that they do not allow ‘to determine the magnitude of the signal, the polarity of the signal, interruption or entanglement of the installation in the circuit.

The closest to the invention according to

a technical entity is a device containing two tires, two 30

2

relays connected to one of the buses directly, and to the other: one through the diode in the forward, and the other through the diode in the opposite direction, and two warning lights connected through the closing contacts of each relay and signaling the polarity of the voltage on the device tires £ s ].

However, this device does not determine the presence, polarity and magnitude of a signal in a controlled circuit connected to one of the device’s buses when it is close in magnitude to the potential of another bus connected to a power source, and therefore does not allow to determine the nature of the fault (interruption or entanglement) in controlled circuits.

The purpose of the invention is to expand the functionality by simultaneously determining whether a signal is present at a controlled point of the circuit, as well as its size and polarity.

This goal is achieved by the fact that the device introduced a third bus connected to the other pole of the power source of the controlled circuit and connected in series with the diode761947

mi zener diodes with a stabilization voltage equal to half the voltage of the power source, with the second diode and the winding of the second relay connected in series between the second and third bus, a voltmeter connected to the first and second buses $

through the contacts of the first relay, and to the second and third tires through the contacts of the second relay. ^

The drawing shows a circuit for monitoring electrical circuits. ten

Device to control the electronic. The first circuit contains the first bus 1, the second bus 2 and the third bus 3, with bus 1 and bus 3 connected to the source 4 of the power supply to the controlled circuit 15, winding the first relay 6, winding the second relay 7, first diode 8, second diode 9, zener 10 and 11, warning lights 12 and 13, voltmeter ^:

¹⁴ ·. 20

The device works as follows.

  2 connects alternately to.

monitored circuit 5. In the absence of a signal in the monitored circuit 5, 25

therefore, bus 2, relays b and 7 do not work, because the voltage applied to the windings of relays 6 and 7 is equal to half the voltage of the power source 4 minus the drop on the respective zener diodes 10, 11 ^1.0

I diodes 8, 9 and significantly less than the voltage of the relay B and 7.

When a signal of negative polarity, close to the magnitude of the voltage of the power supply 4, appears through the bus 2, diode 8 and the zener diode 10, it is applied to the winding of the relay b, on the other hand, the positive potential of the source 4 is applied to the winding of the relay 6. The voltage on the winding of the relay 40 6 increases to a value greater than or equal to the trigger voltage.

Relay b will work, “close” contact b-ϊ, which will turn on the signal lamp 12, and two other closing · 'contacts 6-2 and b-3 will connect the voltmeter 14 bus 3'i to the bus 2. The lamp 12 signals the presence of a negative signal polarity, and the voltmeter 14 measures its value. The second half of the circuit works similarly with relay 7.

This device allows you to simultaneously determine the presence, polarity and magnitude of the signal in the controlled circuits due to the inclusion of the relay according to the proposed scheme, determines the breakage or entanglement of the circuit during installation of electrical installations.

Claims (1)

Claim A device for monitoring DC electrical circuits containing a first bus connected to one of the poles of a controlled circuit power source, a second bus connected to a controlled point * of the circuit between which are connected in series the first diode connected cathode to the second bus> and the winding of the first relay , a second diode connected in series, connected by an anode to a second bus, and a second relay winding, signal lamps connected to a power source through the contacts of the corresponding relays, and a voltmeter, characterized in that, in order to extend the functionality by simultaneously determining the presence of a signal at a controlled point of the circuit, as well as its size and polarity, a third bus connected to the other pole of the source, power to the controlled circuit, and zener diodes connected in series with the diodes is introduced into the device with a stabilization voltage equal to half the voltage of the power source, the second diode and the winding of the second relay connected in series between the second and third wires, a voltmeter n dklyuchen to the first and second buses via the relay contacts of the first and third minutes to the second tire through the contacts of the second relay.