CN210669533U

CN210669533U - Resonance point debugging loop of high-voltage power filter device

Info

Publication number: CN210669533U
Application number: CN201922065517.XU
Authority: CN
Inventors: 孙晓武; 李印达; 郭向明; 李冲; 冯源
Original assignee: Wuxi Power Filter Co ltd
Current assignee: Wuxi Power Filter Co ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-06-02
Anticipated expiration: 2029-11-26

Abstract

The utility model discloses a high voltage electricity filter's resonance point debugging return circuit and debugging method, the characterized in that in debugging return circuit: the debugging loop comprises a filter capacitor, a filter reactor, a harmonic signal generator, an ammeter, a dual-channel oscillometer and a connecting wire, wherein the harmonic signal generator, the filter capacitor, the filter reactor and the ammeter sequentially pass through the connecting wire to form a loop, and the dual-channel oscillometer measures the voltage of the capacitor and the reactor. The utility model discloses the debugging return circuit is simple, the requirement of the long-term safety of high-pressure filter equipment that can make, stable, reliable work.

Description

Resonance point debugging loop of high-voltage power filter device

Technical Field

The utility model relates to an electric energy quality field especially relates to a high voltage electricity filter's resonance point debugging return circuit.

Background

In order to ensure reliable and normal operation of the power system and improve the stability and the power quality of the power system, the harmonic waves of the power grid need to be treated.

In recent years, the harmfulness of harmonics has become increasingly serious due to rapid development of power electronic technology and wide application in power systems, transportation, industrial equipment and household life. Harmonic waves can reduce the efficiency of generation, transmission and use of electric energy, the harmonic waves cause the waveform distortion of voltage and current in an electric power system, and the harmonic voltage and the harmonic current with the same frequency can generate active power and reactive power loss of the same harmonic wave, so that the voltage of a power grid is reduced, and the capacity of the electric power system is wasted. Electrical equipment can also overheat under the action of harmonic waves, vibration and noise interference are generated, the aging of insulation is accelerated, the service life is seriously influenced, and even faults and burnout can be caused if the insulation is not controlled. In addition, the harmonic wave can also cause local series resonance and parallel resonance in the power grid, and the harmonic wave content is amplified, so that the equipment of the capacitor and the reactor is damaged. Harmonic waves can also bring problems to relay protection equipment, cause misoperation of a relay protection device, seriously threaten stable and safe operation of a power supply and distribution system, and cause unnecessary consequences. For weak current equipment such as computer networks, cable televisions and communication outside the power system, harmonic waves in the power system are coupled in modes such as conduction and electromagnetic induction, so that the systems are greatly interfered, and the harmonic waves can seriously affect communication equipment and electronic devices.

The common filtering modes are an active filtering mode and a passive filtering mode, and the passive power filtering device has the advantages of good safety, high reliability, simple circuit structure, low manufacturing cost and low operation cost, and is widely applied to power systems.

In the practical use of the high-voltage power filter device, the resonance point of each filter branch is the key for the safe operation of the device and the achievement of the expected effect of the design. Due to the factors such as component manufacturing deviation, the high-voltage filter device must be debugged at a resonance point in practical application.

The filtering branch of the high-voltage filtering device mainly comprises a filtering capacitor and a filtering reactor. The working principle is common knowledge, but the debugging instruments and methods are different.

The document CN203502518U discloses a portable tuning and debugging test box for parallel power filters, which provides a tuning and debugging circuit, where the test circuit includes a voltmeter, a high-power digital signal generator, a resistor, a current meter, and a connecting wire.

From the document CN 203502518U: 1) the high-power digital signal generator is a voltage source; 2) and the measurement of the voltages of the capacitive reactance loop, the capacitor and the reactor is realized by using a single-pole double-throw switch in the measurement loop. Because the resistance exists in the measuring loop, when measuring 3 voltages in the debugging process, the loop impedance values are different, the current values are different, and the voltage value error is larger. In addition, when the filter reactors are stacked, the error of the measuring circuit in measurement is large.

In summary, the resonant point tuning loop of the high voltage power filter is a technique to be solved.

Disclosure of Invention

In order to solve the problem, improve high voltage electricity filter device resonance point debugging efficiency, accuracy, the utility model provides a high voltage electricity filter device's resonance point debugging circuit.

The utility model adopts the following technical proposal.

The utility model provides a high voltage electricity filter's resonance point debugging return circuit, high voltage filter's filtering branch road mainly is that filter capacitor and filter reactor constitute, and the debugging return circuit mainly comprises filter capacitor, filter reactor, harmonic signal generator, ampere meter, binary channels oscillograph and connecting wire. The harmonic signal generator, the filter capacitor, the filter reactor and the ammeter are connected in sequence through the connecting wires to form a loop. The dual-channel wave indicator consists of an A port, a B port and a com port, the com port is a public connection, the A port and the com port form a measurement channel A, and the B port and the com port form a measurement channel B. The com port of the dual-channel wave indicating meter is connected to the joint of the filter capacitor and the filter reactor, the A port of the dual-channel wave indicating meter is connected to the joint of the filter reactor and the ammeter, and the B port of the dual-channel wave indicating meter is connected to the joint of the harmonic signal generator and the filter capacitor.

The harmonic signal generator is a current source type signal generator, the frequency range is 0-3 KHz, and the current is 0-5A.

The double-channel wave indicator has A, B measuring channels, can measure AC/DC voltage, current and frequency, and selects voltage measuring grade.

The ammeter is a digital ammeter or a digital multimeter, and the current is 0-5A.

The material of the connecting wire is 2.5mm²The copper wire of (1).

Furthermore, the harmonic signal generator can also be a portable low-power harmonic power supply.

Furthermore, the dual-channel wave indicator can also be a multi-channel wave indicator or a multi-channel oscilloscope, and the wiring positions of the measurement channels A and B and the loop can be changed.

Furthermore, the filter reactor adopts a dry type hollow core and cake type structure, the inductance is continuously adjustable, and the noise is less than 70 decibels.

Furthermore, when the filter reactor is three-phase stacked, 3 harmonic signal generators and 3 ammeters are selected.

Furthermore, when the filter reactors are stacked in three phases, the connection parts of the filter capacitors and the filter reactors of the three-phase branches are connected in parallel and then connected with the com port, the voltage value of the A, B, C-phase debugging loop is sequentially measured by the dual-channel wave indicator, and the port A and the port B of the dual-channel wave indicator are sequentially connected into the A, B, C-phase debugging loop.

The utility model has the advantages that: the error in the debugging process of the resonance point of the high-voltage power filter device is reduced, the debugging accuracy is improved, and the working efficiency is improved.

The utility model discloses the debugging return circuit is simple, the requirement of the long-term safety of high-pressure filter equipment that can make, stable, reliable work.

Drawings

Fig. 1 is a schematic diagram of the debugging circuit of the present invention.

Fig. 2 is a circuit diagram of fig. 1.

Fig. 3 is a schematic diagram of a debugging loop during three-phase stacking of the filter reactors.

In the figure, 1-filter capacitor; 2-a filter reactor; 3-a harmonic signal generator; 4-an ammeter; 5-double-channel oscillograph; 6-connecting a wire;

a 51-A port; 52-com port; 53-B port.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

As can be seen from fig. 1 and 2:

a filtering branch of the high-voltage filtering device mainly comprises a filtering capacitor (1) and a filtering reactor (2), and a debugging loop mainly comprises the filtering capacitor (1), the filtering reactor (2), a harmonic signal generator (3), an ammeter (4), a dual-channel wave indicator (5) and a connecting wire (6). The harmonic signal generator (3), the filter capacitor (1), the filter reactor (2) and the ammeter (4) form a loop through a connecting wire (6) in sequence. The dual-channel wave indicating meter (5) consists of an A port (51), a B port (52) and a com port (51), the com port (51) is a public connection wire, the A port (51) and the com port (52) form a measurement channel A, and the B port (53) and the com port (52) form a measurement channel B. A com port (52) of the dual-channel wave indicating meter (5) is connected to the joint of the filter capacitor (1) and the filter reactor (2), an A port (51) of the dual-channel wave indicating meter (5) is connected to the joint of the filter reactor (2) and the ammeter (4), and a B port (53) of the dual-channel wave indicating meter (5) is connected to the joint of the harmonic signal generator (3) and the filter capacitor (1).

As can be seen from fig. 3:

furthermore, when the filter reactors (2) are stacked in three phases, the connection positions of the filter capacitors (1) and the filter reactors (2) of the three-phase branches are connected in parallel and then connected with the com port (52), the double-channel wave indicator (5) sequentially measures the voltage value of the A, B, C-phase debugging circuit, the A-phase debugging voltage value is shown by a solid line, and the B, C-phase debugging circuit is shown by a dotted line.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A resonance point debugging loop of a high voltage power filtering device, the debugging loop characterized by: the debugging loop comprises a filter capacitor, a filter reactor, a harmonic signal generator, an ammeter, a double-channel oscillometer and a connecting wire, the harmonic signal generator, the filter capacitor, the filter reactor and the ammeter are connected in sequence through a connecting wire to form a loop, the dual-channel wave indicating meter consists of an A port, a B port and a com port, the com port is a public wiring, said a port, com port, constitutes a measurement channel a to measure voltage, said B port, com port constitutes a measurement channel B to measure voltage, the com port of the dual-channel wave indicating meter is connected to the joint of the filter capacitor and the filter reactor, the A port of the dual-channel wave indicating meter is connected to the joint of the filter reactor and the current meter, the B port of the dual-channel wave indicating meter is connected to the joint of the harmonic signal generator and the filter capacitor, and the harmonic signal generator is a current source type signal generator.