CN204649860U - A kind of multifunctional high pressure fuse device for detecting performance - Google Patents

Abstract

A performance testing device for a multifunctional high-voltage fuse, including an AC constant current source module (1), a rectifier module (2), a filter module (3), an inverter module (4), a filter module (5), and a superposition module (6 ), AC output module (7), DC output module (8), auxiliary power supply (9), driving power supply (10), control circuit (11), display output module (12), detection and feedback module (13). The utility model has a reasonable and simple structural design, skillfully superimposes currents of different frequencies through the superposition module, and can more truly reflect the frequent fusing phenomenon of high-voltage fuses in the distribution network system due to harmonic current immersion.

Description

A performance testing device for a multifunctional high-voltage fuse

technical field

The utility model relates to the technical field of performance detection and testing of high-voltage fuses.

Background technique

In the actual operation process, the voltage transformers in the distribution network often have high-voltage fuse failures, resulting in voltage loss on the secondary side of the voltage transformers and an abnormal increase in the zero-sequence voltage. In this way, it will cause errors in electric energy measurement, or cause false grounding alarms in the system, and zero-sequence voltage protection relays will malfunction, causing operators to take wrong handling measures and expanding the scope of accidents. On the other hand, the replacement of TV high-voltage insurance is more troublesome, which increases the cost of manpower and material resources. The above conditions are not conducive to the safe, reliable, stable and economical operation of the distribution network, and urgently need to be improved.

Ferroresonance overvoltage is a common internal overvoltage of the neutral point not directly grounded distribution network system, including frequency division resonance, fundamental frequency resonance and high frequency resonance, with the increase of the relative capacitance X _C of the system Large, high-frequency resonance, fundamental frequency resonance, and frequency-division resonance may occur in turn, resulting in distribution network overvoltage and PT overcurrent, flashover of weakly insulated equipment and PT high-voltage fuse blown, and even damage to PT, seriously threatening the distribution network Safety. Therefore, it is necessary to simulate the volt-ampere characteristics of PT high-voltage fuses in harmonic environments through a detection device to improve the quality of fuses and prevent frequent blowing of high-voltage fuses.

Contents of the invention

The purpose of the utility model is to provide a multifunctional high-voltage fuse performance detection device to truly reflect the volt-ampere characteristics of the high-voltage fuse under different harmonics and solve the problem of frequent blown high-voltage fuses in the distribution network.

The utility model is for realizing above-mentioned object, and the technical scheme provided is as follows:

A performance detection device for a multifunctional high-voltage fuse, including an AC constant current source module, a rectification module, a filter module, an inverter module, a filter module, a superposition module, an AC output module, a DC output module, an auxiliary power supply, a drive power supply, and a control circuit , a display output module, a detection and feedback module; the AC constant current source module is connected to the rectifier module, the rectifier module is connected to the filter module, the filter module is respectively connected to the DC output module and the inverter module, and the inverter module is connected to the inverter module The filter module is connected, the filter module is connected with the superposition module, the superposition module is connected with the AC output module, the auxiliary power is directly obtained from the external input power, and the auxiliary power is connected with the driving power, the driving power is controlled by the control circuit, and the control circuit also It is connected with the AC constant current source module, the display and control module is connected with the control circuit, the signal of the detection and feedback module is obtained by the AC output module and the DC output module, and then connected with the control circuit.

The output current range of the AC constant current source module is selected according to the actual measured fusing current of the fuse and the current range to be studied. The superposition module can output the sine wave without superimposition, and can also output the clutter after superposition of different frequency waveforms.

The structure design of the utility model is reasonable and simple, and the currents of different frequencies are skillfully superimposed through the superposition module, which can more truly reflect the frequent fusing phenomenon of high-voltage fuses in the distribution network system due to the immersion of harmonic currents. The utility model uses the rectification and inverter technology to obtain the current of 0~300HZ, and outputs the clutter of simulating the low-frequency saturation current and resonance current of the distribution network through the current superposition module, so as to truly reflect the high-voltage fuse of the ungrounded system in different harmonic environments. Volt-ampere characteristics are of great significance, and at the same time play an important role in the selection and quality control of fuses in ungrounded systems where fuses frequently blow.

Description of drawings

Fig. 1 is a schematic diagram of the device structure principle in the utility model;

Fig. 2 is a control panel plane and a detection circuit diagram of the detection device of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to Fig. 1, the embodiment of the present utility model provides a performance detection device for a multifunctional high-voltage fuse, which includes an AC constant current source module 1, a rectifier module 2, a filter module 3, an inverter module 4, a filter module 5, and a superposition module 6 , AC output module 7, DC output module 8, auxiliary power supply 9, drive power supply 10, control circuit 11, display output module 12, detection and feedback module 13, the AC constant current source module 1 is connected to the rectifier module 2, The rectifier module 2 is connected to the filter module 3, the filter module 3 is connected to the DC output module 8 and the inverter module 4 respectively, the inverter module 4 is connected to the filter module 5, the filter module 5 is connected to the superposition module 6, and the superposition module 6 is then connected to the AC output module 7, the auxiliary power supply 9 is directly obtained from an external input power supply, the auxiliary power supply 9 is connected to the driving power supply 10, and the driving power supply 10 is controlled by the control circuit 11, and the control circuit 11 is also connected to the AC constant current source module 1 connected, the display and control module 12 is connected to the control circuit 11 , the signal of the detection and feedback module 13 is obtained by the AC output module 7 and the DC output module 8 , and then connected to the control circuit 11 .

Referring to Figure 2, the left rectangular box is a schematic diagram of the device panel. The functions of each button and screen are as follows: 14 is the power input switch, 15 is the frequency display screen, 16 is the voltage display screen, 17 is the current system screen, 18 is the DC output switch, 19 is the DC stop button, 20 is the The voltage adjustment knob for DC output, 21 is the current adjustment knob for DC output, 22 is the frequency fine-tuning knob for AC output, the frequency can be adjusted arbitrarily within a certain frequency range, and 23 is the fixed frequency adjustment knob for AC output. 24 is the start button of AC output, 25 is the emergency stop button of AC output, 26 is the fixed frequency adjustment knob of superposition channel 1, 27 is the fixed frequency adjustment knob of superposition channel 2, 28 AC The output voltage adjustment knob, 29 is the selection knob for the AC output to be a positive wave or superimposed clutter, 30 is the fixed frequency adjustment knob of the superimposed channel 3, and 31 is the current adjustment knob of the AC output. Figure 2 shows the situation where the tested fuse is connected to the AC output channel, and the fuse can also be connected to the DC output channel to test the influence of the DC output on the performance of the fuse.

The frequency of the current applied to both ends of the fuse in the utility model can be adjusted arbitrarily from 0 to 300 Hz, and currents of 3 or less different frequencies can be arbitrarily superimposed according to requirements; the superimposed current of different frequencies output by the superposition module can more realistically simulate _6.3kV ~ The low-frequency saturation current flowing through the high-voltage fuse at the moment of single-phase grounding restoration in the 35kV ungrounded system and the resonant current flowing through the fuse when ferromagnetic resonance occurs.

According to the disclosure and guidance of the above description and the examples, those skilled in the relevant technical fields can also make various modifications or variations to the above embodiment without departing from the scope of the present utility model, and adopt the same or similar structure Obtaining other constant current alternating devices is all within the protection scope of the present utility model.

Claims (3)

1. A performance testing device for a multifunctional high-voltage fuse, characterized in that it includes an AC constant current source module (1), a rectifier module (2), a filter module (3), an inverter module (4), and a filter module (5 ), superposition module (6), AC output module (7), DC output module (8), auxiliary power supply (9), drive power supply (10), control circuit (11), display output module (12), detection and feedback module (13); the AC constant current source module (1) is connected to the rectifier module (2), the rectifier module (2) is connected to the filter module (3), and the filter module (3) is respectively connected to the DC output module ( 8) It is connected with the inverter module (4), the inverter module (4) is connected with the filter module (5), the filter module (5) is connected with the superposition module (6), and the superposition module (6) is connected with the AC output The modules (7) are connected, the auxiliary power supply (9) is directly obtained from the external input power supply, the auxiliary power supply (9) is connected with the driving power supply (10), the driving power supply (10) is controlled by the control circuit (11), and the control circuit (11 ) is also connected with the AC constant current source module (1), the display and control module (12) is connected with the control circuit (11), and the signal of the detection and feedback module (13) is provided by the AC output module (7) and the DC output module (8) obtain, and then be connected with the control circuit (11). 2. A multifunctional high-voltage fuse performance detection device according to claim 1, characterized in that the output current range of the AC constant current source module (1) is based on the actual fusing current of the measured fuse and the required The current range selected for the study. 3. A performance testing device for a multifunctional high-voltage fuse according to claim 1, characterized in that the superposition module (6) can output sine waveforms without superimposition, and can also output superimposed sinusoidal waveforms of different frequency waveforms. clutter.