CN101368999B - Detection apparatus for portable anti-parallel thyristor zero-cross trigger - Google Patents

Abstract

The portable anti-parallel thyristor zero-crossing trigger detection device provided by the invention can be carried around, and can detect the zero-crossing trigger at the zero-crossing trigger manufacturer and the site where the anti-parallel thyristor switch is used. The detection device includes a fuse, an anti-parallel thyristor module, a capacitor, an indicator light, a current transformer, and a zero-crossing comparison circuit. Working power supply, after pressing the test button of the detection device, the control command signal is transmitted to the anti-parallel thyristor zero-crossing trigger, and the zero-crossing trigger starts to send a trigger signal after the zero-crossing comparison.

Description

A portable anti-parallel thyristor zero-crossing trigger detection device

technical field

The patent of the invention belongs to the field of power electronics application and power system technology, and mainly relates to a portable anti-parallel thyristor zero-crossing trigger detection device.

Background technique

The traditional detection method for anti-parallel thyristor zero-crossing trigger is to make a detection platform for anti-parallel thyristor zero-crossing trigger, and use an oscilloscope to display the waveform at the instant of zero-crossing trigger. Due to its large size and heavy weight, this detection platform is only suitable for manufacturers that produce anti-parallel thyristor zero-crossing triggers. When the anti-parallel thyristor switch fails in the industrial field, it is impossible to judge whether the fault point is the zero-crossing trigger. Therefore The zero-cross trigger can only be removed and replaced as a whole, which causes a lot of waste and a lot of work.

The portable anti-parallel thyristor zero-crossing trigger detection device introduced in the present invention can directly detect the zero-crossing trigger or switch no matter in the manufacturer of the zero-crossing trigger or in the industrial use site of the anti-parallel thyristor switch, without any Auxiliary equipment, replacing the traditional detection platform, is small in size, light in weight and easy to carry. At present, the same or similar technology has not been seen at home and abroad.

Contents of the invention

The portable anti-parallel thyristor zero-crossing trigger detection device of the present invention is mainly composed of a fuse, an anti-parallel thyristor module, a capacitor, an indicator light, and a zero-crossing comparison circuit.

The basic principle of this device: connect the trigger line and control command line of the anti-parallel thyristor zero-crossing trigger to the device correctly and then turn on the working power.

After pressing the "Test" button, the control command signal is transmitted to the anti-parallel thyristor zero-crossing trigger, and the zero-crossing trigger starts to send a trigger signal after the zero-crossing comparison.

If the trigger signal of the zero-crossing trigger can be sent out correctly at the zero-crossing moment, the anti-parallel thyristor module is turned on, and there is no inrush current when the capacitor is energized, the working indicator light is on, indicating that the zero-crossing trigger is working normally.

If the zero-crossing trigger is faulty and the zero-crossing trigger signal cannot be sent out, or cannot be sent out at zero-crossing, the working indicator light will not be on.

This device is equipped with a current detection device in the capacitor circuit, which can detect the current of the capacitor in real time. When the anti-parallel thyristor module is not triggered at the zero-crossing moment, there will be an inrush current higher than its rated current value at the moment when the capacitor is turned on. After the detection device detects the inrush current, it will send a signal to disconnect the working circuit of the indicator light, so that the indicator light will not be lit, so as to judge whether the zero-crossing trigger of the anti-parallel thyristor is faulty.

The advantages of the portable anti-parallel thyristor zero-crossing trigger detection device of the present invention:

1. It can be carried around, which is convenient for detection at the industrial site of the anti-parallel thyristor switch;

2. The device itself has a zero-crossing comparison circuit, which does not require an oscilloscope during detection, reducing the number of auxiliary equipment used;

3. When detecting the anti-parallel thyristor zero-crossing trigger or anti-parallel thyristor switch in the field, it is not necessary to separate it from the main equipment, and only need to lead the relevant lines to the detection system.

Description of drawings

1 is a schematic diagram of the internal structure of a portable anti-parallel thyristor zero-crossing trigger detection device according to the present invention;

Fig. 2 is a schematic diagram of a zero-crossing comparator circuit in the present invention;

Fig. 3 is a connection diagram of the present invention and an anti-parallel thyristor zero-crossing trigger.

Detailed ways

Referring to Fig. 1, the electrical primary part of the present invention mainly includes: a main circuit composed of fuses, anti-parallel thyristor modules, and capacitors; a display circuit composed of indicator lights and normally closed contacts of relays.

Referring to Fig. 2, the electrical secondary part of the present invention mainly includes: a DC power supply TF1, a current sampling circuit composed of a current transformer PTA1, a capacitor C1C2, a diode D1D2, a resistor R1R2, and an operational amplifier U1; it is composed of a resistor R3R4R6 and an operational amplifier U2 The comparison circuit; the reference voltage circuit composed of resistor R5, capacitor C3, and regulator DZ1; the signal output circuit composed of resistor R7, transistor Q1, and relay RLY1; the control command signal output circuit composed of button S1 and +12V DC power supply.

Fig. 3 shows an application example of the present invention---detecting the zero-crossing trigger performance of the anti-parallel thyristor zero-crossing trigger. Wiring as shown in the figure, the output control command signal terminals out1 and out2 of the present invention are connected with the command input terminals In1 and In2 of the anti-parallel thyristor zero-crossing trigger; the anti-parallel thyristor module trigger lines G1, K1, G2, K2 of the present invention It is connected with the pulse output terminals G1, K1, G2, and K2 of the anti-parallel thyristor zero-crossing trigger.

When working, the present invention is correctly connected with the anti-parallel thyristor zero-crossing trigger according to Fig. 3, and the AC220V working power supply is connected. At this time, the anti-parallel thyristor module in the present invention is not turned on, and the indicator light is off.

Press the button S1, the +12V control command signal is sent to the anti-parallel thyristor zero-crossing trigger, and the anti-parallel thyristor zero-crossing trigger sends a trigger pulse to the terminals G1, K1, G2, K2 of the present invention at the zero-crossing moment, and the anti-parallel thyristor The module is turned on, and a current is generated in the primary circuit.

In Figure 2, the current transformer PTA1 measures the current in the primary loop, and outputs a voltage signal after being converted by the operational amplifier U1. When the primary loop current is at the rated value, the output voltage signal is 2V. In the reference voltage loop, the regulator DZ1 is connected in series with the resistor R5 to output a constant reference voltage of 2.2V. The operational amplifier U2 compares the reference voltage with the measured primary loop current value (which has been converted into a voltage signal), and the output level of the comparison loop is added to the resistor R7. If the capacitor is turned on at the zero-crossing moment, no inrush current will be generated, the actual measured value of the current is less than the reference value, the comparison circuit outputs a low level, there is no voltage on R7, the transistor Q1 is not turned on, and the relay RLY1 does not act. The indicator light is on, indicating that the anti-parallel thyristor zero-crossing trigger is working normally. If the capacitor is not turned on at the zero-crossing moment, an inrush current will be generated, the measured value is greater than the reference value, the comparison circuit outputs a high level, the transistor Q1 is turned on, the relay RLY1 operates, and the indicator light in the primary circuit does not light up, indicating that the anti-parallel thyristor The zero cross trigger is not working properly.

The invention has been described in terms of preferred embodiments. Obviously, various modifications and substitutions will occur to others upon reading and understanding the above detailed specification. It is intended that the present invention be constructed to include all such modifications and substitutions as come within the scope of the appended claims or their equivalents.

Claims (2)

1. A detection device for detecting a portable anti-parallel thyristor zero-crossing trigger or an anti-parallel thyristor switch, comprising a fuse, an anti-parallel thyristor module, a capacitor, an indicator light and a zero-crossing comparison circuit, characterized in that the The anti-parallel thyristor zero-crossing trigger or the trigger line and control command line of the anti-parallel thyristor switch are connected to the detection device, and then the working power is turned on. After pressing the test button of the detection device, the control command signal is transmitted to the anti-parallel thyristor zero-crossing trigger. On the anti-parallel thyristor switch, the anti-parallel thyristor zero-crossing trigger or the anti-parallel thyristor switch sends out a trigger signal. If the trigger signal of the zero-crossing trigger or switch can be sent out correctly at the zero-crossing moment, the anti-parallel thyristor module of the detection device If there is no inrush current when the capacitor is energized, the working indicator light will be on, indicating that the zero-crossing trigger or switch is working normally. If the zero-crossing trigger or switch is faulty, the trigger signal of the zero-crossing trigger or switch cannot If it is issued, or cannot be issued correctly at the zero-crossing moment, the working indicator light will not be on. 2. The detection device for detecting portable anti-parallel thyristor zero-crossing trigger or anti-parallel thyristor switch as claimed in claim 1, characterized in that a current detection device is installed in the capacitor circuit, which can detect the current of the capacitor in real time, when The anti-parallel thyristor module is not triggered at the zero-crossing moment, and there will be an inrush current higher than its rated current value at the moment when the capacitor is turned on. After the current detection device detects the inrush current, it will send a signal to disconnect the working circuit of the indicator light. The indicator light is not lit, so as to determine whether the anti-parallel thyristor zero-crossing trigger or the anti-parallel thyristor switch is faulty.

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