CN202126467U - Low-voltage arc controllable simulation generation device - Google Patents

Abstract

A low-voltage arc controllable analog generating device relates to the technical field of arc protection and solves the technical problems of fault arc performance detection and generation mechanism research. The device includes an arc generating mechanism, a circuit interface module, and a control module; the arc generating mechanism includes a fixed electrode fixed on the base, a horizontal slide table slidably installed on the base, and a movable electrode fixed on the horizontal slide table, driven The stepper motor that slides on the horizontal slide, and the relay connecting the two electrodes; the circuit interface module includes an AC arc voltage synchronous sampling circuit and an AC current synchronous sampling circuit; the control module controls the movement of the movable electrode by controlling the stepper motor , so that an arc is generated between the two electrodes, the arc is extinguished by controlling the relay, and the arc voltage and current are collected through the circuit interface module. The device provided by the utility model can simulate the occurrence of a fault arc, which is beneficial to the performance detection of the related fault arc of electrical equipment and the research on the generation mechanism of the fault arc.

Description

Low-voltage arc controllable analog generator

technical field

The utility model relates to an arc protection technology, in particular to a technology of a low-voltage arc controllable analog generating device. the

Background technique

Arc faults can easily cause electrical fires and damage electrical equipment, resulting in casualties and major economic and property losses.

However, at present there is no equipment for the performance detection of electrical equipment and the research on the mechanism of fault arc generation, so the current electrical equipment and electrical lines can only use conventional line protection devices (such as residual current protection circuit breakers, fuses device) for passive protection.

Utility model content

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the utility model is to provide a low-voltage arc controllable simulation that can simulate the occurrence of fault arcs, which is beneficial to the detection of related fault arc performance of electrical equipment and the research on the mechanism of fault arc generation. generating device.

In order to solve the above technical problems, the utility model provides a low-voltage arc controllable analog generating device, which is characterized in that it includes an arc generating mechanism, a circuit interface module, and a control module;

The arc generating mechanism includes a base, a horizontal slide table, a screw rod, a stepping motor, a relay and two electrodes, one of which is a copper rod and the other is a carbon rod, and the base is fixed on On the floor, and a linear horizontal slide rail is fixed on the base, the horizontal slide table is slidably installed on the horizontal slide rail of the base, the stepper motor is installed on the base, and its power shaft is connected to the screw shaft , the screw rod is threadedly connected with the horizontal slide table, the two electrodes are fixed electrode and movable electrode respectively, the fixed electrode is fixed on the base, the movable electrode is fixed on the horizontal slide table, and is connected with the fixed electrode The electrodes are in electrical contact, and the two normally open contacts of the relay are respectively connected to the two electrodes;

The circuit interface module includes an AC arc voltage synchronous sampling circuit and an AC current synchronous sampling circuit. The AC arc voltage synchronous sampling circuit includes a voltage sampling amplifier and a voltage transformer. The voltage sampling amplifier has an output terminal and two input terminals. , one of the input terminals is connected to its output terminal through a voltage sampling resistor; the voltage transformer has two windings, and the two ends of one of the windings are respectively connected to the two input terminals of the voltage sampling amplifier, and one end of the other winding is passed through A current limiting resistor is connected to an electrode of the arc generating mechanism, and the other end of the winding is connected to the other electrode of the arc generating mechanism; the synchronous sampling circuit for alternating current includes a current sampling amplifier and a current transformer, and the current sampling amplifier has One output terminal and two input terminals, one of which is connected to its output terminal through a current sampling resistor; the current transformer has an induction winding, and the two ends of the induction winding are respectively connected to the two inputs of the current sampling amplifier end;

The control module is provided with a voltage signal collection port, a current signal collection port, a motor control port, and a relay control port, the voltage signal collection port is connected to the output terminal of the voltage sampling amplifier, and its current signal collection port is connected to the output terminal of the current sampling amplifier. The motor control port is connected to the stepper motor in the arc generating mechanism, and its relay control port is connected to the control coil of the relay in the arc generating mechanism.

The low-voltage arc controllable simulation generating device provided by the utility model uses the control module to control the operation of the stepping motor in the arc generating mechanism to control the movement of the movable electrode, so that an arc is generated between the two electrodes to simulate the occurrence of a fault arc, and through the circuit The interface module collects the arc voltage and arc current, and through the analysis of the arc voltage and current characteristics, it detects the relevant fault arc performance of electrical equipment and studies the fault arc generation mechanism.

Description of drawings

Fig. 1 is a structural block diagram of a low-voltage arc controllable analog generating device according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of the arc generating mechanism in the low-voltage arc controllable analog generating device of the embodiment of the present invention;

Fig. 3 is a circuit diagram of the circuit interface module in the low-voltage arc controllable simulation generating device of the embodiment of the present invention.

Detailed ways

The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present utility model. All similar structures and similar changes of the utility model should be included in the protection of the utility model. scope.

As shown in Figures 1-3, a low-voltage arc controllable simulation generator provided by the embodiment of the present invention is characterized in that it includes an arc generating mechanism, a circuit interface module, and a control module 3;

Described electric arc generating mechanism comprises base 11, horizontal slide table 13, screw mandrel 14, stepping motor 12, relay 17 and two electrodes, one electrode in described two electrodes is a copper rod, and another electrode is a carbon rod, The base 11 is fixed on the floor object, and a linear horizontal slide rail is fixed on the base 11. The horizontal slide table 13 is slidably installed on the horizontal slide rail of the base 11, and the stepper motor 12 is installed on the base 11, its power shaft is connected to the screw rod 14, and the screw rod 14 is screwed to the horizontal slide table 13. The two electrodes are respectively a fixed electrode 16 and a movable electrode 15, and the fixed electrode 16 is fixed on the base 11, the movable electrode 15 is fixed on the horizontal slide table 13, and is in electrical contact with the fixed electrode 16, and the two normally open contacts of the relay 17 are respectively connected to the two electrodes;

The circuit interface module includes an AC arc voltage synchronous sampling circuit 21 and an AC current synchronous sampling circuit 22. The AC arc voltage synchronous sampling circuit 21 includes a voltage sampling amplifier A1 and a voltage transformer T1. The voltage sampling amplifier A1 has an output terminal, two input terminals, one of which is connected to its output terminal through a voltage sampling resistor R1; the voltage transformer T1 has two windings, and the two ends of one of the windings are respectively connected to two voltage sampling amplifiers A1 At the input end, one end of the other winding is connected to an electrode of the arc generating mechanism (connected to the fixed electrode 16 in this embodiment) through a current limiting resistor R2, and the other end of the winding is connected to the other electrode of the arc generating mechanism (in this embodiment connected to the movable electrode 15 in the embodiment); the AC current synchronous sampling circuit 22 includes a current sampling amplifier A2 and a current transformer T2, and the current sampling amplifier A2 has an output terminal and two input terminals, one of which is connected to its output terminal through a current sampling resistor R3; the current transformer T2 has an induction winding, and the two ends of the induction winding are respectively connected to the two input terminals of the current sampling amplifier A2;

The control module 3 is provided with a voltage signal acquisition port, a current signal acquisition port, a motor control port, and a relay control port, and its voltage signal acquisition port is connected to the voltage sampling amplifier output terminal in the AC arc voltage synchronous sampling circuit 21, and its current signal acquisition port The port is connected to the output end of the current sampling amplifier in the AC current synchronous sampling circuit 22, its motor control port is connected to the stepper motor 12 in the arc generating mechanism, and its relay control port is connected to the control coil of the relay 17 in the arc generating mechanism.

In the embodiment of the utility model, the control module is also provided with a keyboard interface, a collection signal output port and an alarm signal output port.

In the embodiment of the utility model, the control module is a computer.

When using the embodiment of the utility model, one output terminal of the power supply AC is connected in series with the load 4 to the movable electrode 15 (or fixed electrode), and the other output terminal of the power supply AC is connected to the fixed electrode 16 (or movable electrode), Connect the induction winding of the current transformer T2 with the connection line between the power supply and the load, connect the keyboard interface of the control module to a keyboard, and connect the acquisition signal output port of the control module to an external analysis device (such as an oscilloscope). Connect the alarm signal output port of the control module to an external alarm device (such as a warning light or a buzzer).

The working steps of the utility model embodiment are as follows:

The operator first inputs to the control module the number of fault arcs to be simulated and the threshold range of the arc voltage judgment voltage signal (between 0.3-0.8V) to the control module, and then inputs the arc generation command;

After the control module receives the arc generation command, it outputs the motor control signal through its motor control port to drive the stepper motor in the arc generation mechanism to rotate forward, and the screw rod rotates forward synchronously with it, so that the horizontal slide moves away from the fixed electrode. , the fixed electrode and the movable electrode are also separated, so that the air between the fixed electrode and the movable electrode is broken down to generate an arc;

The control module collects the voltage of the load line in real time through its voltage signal acquisition port and the AC arc voltage synchronous sampling circuit, and collects the current of the load line in real time through its current signal acquisition port and the AC current synchronous sampling circuit, and takes the collected voltage and current first. Then judge the jump characteristics of the collected voltage. If the collected voltage is within the threshold range of the arc voltage judging voltage signal, and it is judged that there is current in the load line through the collected current, it is determined that an arc is generated;

After the control module detects the occurrence of an arc, it outputs a motor control signal through its motor control port to stop the stepping motor in the arc generating mechanism, and counts the number of arc occurrences. When the number of fault arcs is consistent, an arc extinguishing signal is output through the relay control port, so that the armature of the relay in the arc generating mechanism is attracted to the two normally open contacts, so that the arc between the fixed electrode and the movable electrode is extinguished , and then output a motor control signal through its motor control port to make the stepper motor in the arc generating mechanism reverse and return to the original position of mutual electrical contact;

When the control module determines that the collected voltage is an arc, it outputs it to an external analysis device for analysis through its collection signal output port;

When the control module detects that the arc is abnormal, it outputs a motor control signal through its motor control port to make the stepper motor in the arc generating mechanism reverse and return to the original position of mutual electrical contact, and outputs a signal through its alarm signal output port. Alarm signal to external alarm equipment to remind the operator;

The abnormality of the arc includes the unstable combustion when the arc occurs, the arc signal exists when there is no arc generation instruction, and the short circuit is caused by the gap between the two electrodes during the arc generation process.

Claims (1)

1. a low-tension arc controllable simulation generating means is characterized in that: comprise arc generator structure, circuit interface module, control module;

Said arc generator structure comprises base, horizontal sliding table, screw mandrel, stepper motor, relay and two electrodes, and an electrode in said two electrodes is a copper rod, and another electrode is a carbon-point; Said base is fixed on and lands on the thing, and on base, is fixed with rectilinear horizontal slide rail, and said horizontal sliding table is slidingly mounted on the horizontal slide rail of base; Said stepper motor is installed on the base; Its line shaft and screw mandrel are coupling, and said screw mandrel is threaded with horizontal sliding table, and said two electrodes are respectively fixed electorde, movable electrode; Said fixed electorde is fixed on the base; Said movable electrode is fixed on the horizontal sliding table, and contacts with fixed electorde is electric, and two normally opened contacts of said relay connect two electrodes respectively;

Said circuit interface module comprises alternating current arc voltage synchronous sampling circuit, alternating current synchronized sampling circuit; Said alternating current arc voltage synchronous sampling circuit comprises voltage sample amplifier, voltage transformer (VT); Said voltage sample amplifier has an output terminal, two input ends, and one of them input end is received its output terminal through a voltage sample resistance; Said voltage transformer (VT) has two windings; Two input ends of voltage sample amplifier are received at the two ends of one of them winding respectively; One end warp, one current-limiting resistance of another winding is received an electrode of arc generator structure, and the other end of this winding is received another electrode of arc generator structure; Said alternating current synchronized sampling circuit comprises current sample amplifier, current transformer, and said current sample amplifier has an output terminal, two input ends, and one of them input end is received its output terminal through a current sampling resistor; Said current transformer has an induction winding, and two input ends of current sample amplifier are received at the two ends of this induction winding respectively;

Said control module is provided with voltage signal acquisition mouth, current signal acquisition port, Electric Machine Control mouth, relay control mouth; Its voltage signal acquisition mouth connects the voltage sample amplifier out; Its current signal acquisition port connects the output terminal of current sample amplifier; Its Electric Machine Control mouth connects the stepper motor in the arc generator structure, the control coil of the relay in its relay control mouthful connection arc generator structure.

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