WO2019018969A1

WO2019018969A1 - Reactor having overvoltage suppression function and manufacturing method therefor

Info

Publication number: WO2019018969A1
Application number: PCT/CN2017/094005
Authority: WO
Inventors: 陈邦栋
Original assignee: 江苏思源赫兹互感器有限公司
Priority date: 2017-07-24
Filing date: 2017-07-24
Publication date: 2019-01-31

Abstract

A reactor having an overvoltage suppression function and a manufacturing method therefor. The reactor comprises wire coils, the wire coils comprising a first coil and a second coil, the first coil and the second coil being connected in series, and both ends of the second coil are provided in parallel with guard gaps; when the voltage of the second coil reaches a breakdown voltage of the guard gaps, the guard gaps are broken down to lower the voltage of the reactor. The manufacturing method comprises the following steps: fastening an insulation sleeve on the outer side of an iron core; wrapping high voltage cable paper on the insulation sleeve; winding a first coil; winding a second coil; and connecting the guard gaps and the second coil in parallel. The reactor utilizes the principle of electromagnetic induction, and the guard gaps are additionally provided in an original reactor; when the reactor bears a relatively large voltage, discharge protection is performed, so as to lower the voltage of the reactor, thereby protecting the reactor in a timely manner, and preventing the reactor from being burned and damaged, and the parallel configuration of the guard gaps implements more convenient installation and replacement.

Description

Reactor with suppression overvoltage and manufacturing method thereof

Technical field

The invention relates to the technical field of a capacitive voltage transformer CVT compensating reactor, in particular to a reactor with suppressed overvoltage and a manufacturing method thereof.

Background technique

With the development of society, the expansion of the grid capacity makes the rated value of the system short-circuit capacity increase rapidly. When the power system is short-circuited, a large value of short-circuit current will be generated, and it is difficult to maintain the dynamic stability of the capacitive voltage transformer CVT. Thermally stable, in order to limit the short-circuit current of the capacitive voltage transformer CVT, to protect the power equipment, a reactor must be installed, the reactor can reduce the short-circuit current and keep the voltage of the short-circuit system unchanged. The reactor is a large inductive coil. According to the principle of electromagnetic induction, the magnetic field of the induced current always hinders the change of the original magnetic flux. If the original magnetic flux is reduced, the magnetic field of the induced current is in the same direction as the original magnetic field, if the original magnetic flux increases. The magnetic field of the induced current is opposite to the original magnetic field. According to this principle, if a short-circuit fault suddenly occurs, the current suddenly increases. In this large inductor coil, a reverse potential E is generated which hinders the change of the magnetic flux. Under the action of this reverse potential E, it is inevitable. To generate a reverse current, to limit the sudden increase in current limit, to limit the short-circuit current, thus maintaining the bus voltage level.

The long-term running time of the reactor under the rated load is the service life of the reactor. After long-term reactors under the action of higher temperature, electric field and magnetic field, the mechanical properties of the original materials will be weakened, resulting in damage to the reactor, and the replacement of the reactor is also time-consuming and labor-intensive.

Summary of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a reactor having an overvoltage suppression and a manufacturing method thereof, and a protection gap is added to the reactor, and the reactor is subjected to a large When the voltage is applied, the voltage of the protection gap also rises, and the discharge protection is performed to lower the voltage across the reactor, thereby protecting the reactor.

In order to solve the technical problems in the prior art, the present invention provides a reactor having an overvoltage suppression, comprising a wire coil, the wire coil comprising a first coil and a second coil, the first coil and the second coil being connected in series Connecting, a protective gap is disposed in parallel at both ends of the second coil, and when a voltage across the second coil reaches a breakdown voltage of the protection gap, the protection gap breaks down to reduce both ends of the reactor The voltage, the current value passing through the second coil when the protective gap is broken down is smaller than the maximum current carrying value of the second coil.

Further, the wire diameter of the second coil is larger than the wire diameter of the first coil, and the number of turns of the second coil is smaller than the number of turns of the first coil.

Further, an iron core is further included, the iron core passing through a center of the first coil and the second coil, and an outer side of the iron core is provided with an insulating cylinder.

Further, a protection resistor is further included, the protection resistor is connected in series with the protection gap, and the protection resistor and the protection gap are connected in parallel at both ends of the second coil.

A method for manufacturing a reactor having an overvoltage suppression, the steps are as follows:

The insulating sleeve is sleeved on the outer side of the iron core;

Covering the outer wall of the insulating sleeve with high-voltage cable paper;

Winding a first wire on an outer side of the high voltage cable paper to form a first coil;

Winding a second wire outside the first coil to form a second coil, the second coil being connected in series with the first coil;

Two wires are respectively drawn at two ends of the second coil, and a guard gap is arranged in parallel on the two wires.

Further, the protective gap is a discharge tube.

Further, a fiberglass tube is sleeved on both ends of the coil of the reactor.

Further, an insulating paper is disposed outside the first coil and the second coil.

Further, the first coil and the second coil are wound in a layered manner, and a high-voltage cable paper is disposed between the layers.

Further, a protection resistor is connected in series on the parallel branch having a guard gap.

The beneficial effects of the invention: the protection reactor of the invention utilizes the principle of electromagnetic induction, in the original A protective gap is added to the reactor. When the reactor is subjected to a large voltage, the voltage of the protection gap is also increased. The discharge protection is performed, the voltage across the reactor is reduced, and the reactor is protected in time to prevent damage. Reactors, and the protection gaps are arranged in parallel, making installation and replacement more convenient.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart of a method of making the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

One embodiment of the present invention discloses a reactor having an overvoltage suppression, comprising a wire coil, the wire coil comprising a first coil and a second coil, the first coil and the second coil being connected in series, The wire diameter of the second coil is larger than the wire diameter of the first coil, the number of turns of the second coil is smaller than the number of turns of the first coil, and the second coil is provided with a protective gap in parallel at both ends, when the second When the voltage across the coil reaches the breakdown voltage of the protection gap, the protection gap breaks down to reduce the voltage across the reactor, and the current value through the second coil when the protection gap breaks is smaller than the second coil The maximum current carrying value.

The reactor further includes a core that passes through a center of the first coil and the second coil, and an outer side of the core is provided with an insulating cylinder.

The reactor further includes a protection resistor, the protection resistor and the protection gap string And the protection resistor and the protection gap are connected in parallel at both ends of the second coil for reducing a large current appearing on the line when the protection gap is protected.

The so-called protective gap is a simple lightning protection device composed of two metal electrodes. One of the electrodes is fixed on the insulator, and is connected to the live conductor, and the other electrode is connected to the grounding device through the auxiliary gap, and a predetermined gap distance is maintained between the two electrodes. The protective gap has a simple structure and is easy to maintain. Under normal circumstances, the protection gap is insulated to the ground, and the insulation strength is lower than the insulation level of the protected line. Therefore, when the line is struck by lightning, the protection gap is first broken by overvoltage, and a large amount of lightning current is discharged. Into the earth, the overvoltage is greatly reduced, thus protecting the line and electrical equipment.

In one embodiment of the present invention, a method for fabricating a reactor having an overvoltage suppression is disclosed. As shown in FIG. 1, the steps are as follows:

The insulating sleeve is sleeved on the outer side of the iron core;

Covering the outer wall of the insulating sleeve with high-voltage cable paper;

Winding a first wire on the outer side of the high-voltage cable paper to form a first coil, one end of the first wire is fixed by a fiberglass hose, and the first coil is wound in a layered manner, and the layer is a high-voltage cable paper is disposed between the layers, and the first coil is provided with an insulating paper;

Winding a second wire outside the first coil to form a second coil, one end of the second wire is fixed by a fiberglass hose, the second coil is connected in series with the first coil, and the second coil is divided into Winding in a layered manner, high-voltage cable paper is disposed between the layers, and insulating paper is disposed outside the second coil;

Two wires are respectively drawn at two ends of the second coil, and a guard gap is arranged in parallel on the two wires. The wire diameter of the second coil is larger than the wire diameter of the first coil. When the reactor is subjected to a large voltage, the voltage of the protection gap is also increased, and the discharge protection is performed to play a thicker role, and The thick wire can withstand short-circuit overcurrent and protect the reactor from burning.

In one embodiment of the invention, a protective resistor is connected in series on the parallel branch with a protective gap for reducing the large current that occurs in the line when the protective gap is protected.

In one embodiment of the invention the guard gap is a discharge tube. The discharge tube is a A high voltage protection element for the input of the device. If the voltage at both ends is higher than the protection specification value, a short circuit will occur inside and the input overvoltage will be absorbed. Structurally, the gas discharge tube can be regarded as a symmetrical switch with a small capacitance, which is turned off under normal working conditions, and its inter-electrode resistance is above the mega-ohm level. When the surge voltage exceeds the withstand voltage of the circuit system, the gas discharge tube is broken down and the arc discharge phenomenon occurs. Because the arc voltage is low, it is only several tens of volts, which can limit the further rise of the surge voltage in a short time. . The gas discharge tube uses the above principle to limit the surge voltage and protect the circuit from overvoltage.

The invention has the beneficial effects that the protection reactor of the invention utilizes the principle of electromagnetic induction to add a protection gap on the original reactor, and when the reactor is subjected to a large voltage, the protection gap voltage also increases, the discharge protection is performed, and the reactance is reduced. The voltage at both ends of the device plays the role of protecting the reactor in time, preventing the damage to the reactor from being burnt, and the protection gap is arranged in parallel, and the installation and replacement are more convenient.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. These improvements and retouchings are also considered. It is the scope of protection of the present invention.

Claims

A reactor having an overvoltage suppression, comprising: a wire coil, the wire coil comprising a first coil and a second coil, wherein the first coil and the second coil are connected in series, and the two ends of the second coil Provided in parallel with a protection gap, when the voltage across the second coil reaches a breakdown voltage of the protection gap, the protection gap is broken down to reduce the voltage across the reactor, and the protection gap is broken down The current value through the second coil is less than the maximum current carrying value of the second coil.
A reactor with an overvoltage suppression according to claim 1, wherein the wire diameter of the second coil is larger than the wire diameter of the first coil, and the number of turns of the second coil is smaller than the first The number of turns of the coil.
A reactor having an overvoltage suppression according to claim 1, further comprising an iron core, said iron core passing through a center of said first coil and said second coil, said outer core of said core There is an insulation cylinder.
A reactor having an overvoltage suppression according to claim 1, further comprising a protection resistor, said protection resistor being connected in series with said protection gap, and said protection resistor and said protection gap being connected in parallel Both ends of the coil.
A method for manufacturing a reactor having an overvoltage suppression, characterized in that the steps are as follows:

The insulating sleeve is sleeved on the outer side of the iron core;

Covering the outer wall of the insulating sleeve with high-voltage cable paper;

Winding a first wire on an outer side of the high voltage cable paper to form a first coil;

Winding a second wire outside the first coil to form a second coil, the second coil being connected in series with the first coil;

Two wires are respectively drawn at two ends of the second coil, and are connected in parallel on the two wires Set the protection gap.
The method of manufacturing a reactor having an overvoltage suppression according to claim 5, wherein the protective gap is a discharge tube.
The method of manufacturing a reactor having an overvoltage suppression according to claim 5, wherein a fiberglass tube is sleeved on both ends of the coil of the reactor.
The method of manufacturing a reactor having an overvoltage suppression according to claim 5, wherein the first coil and the second coil are provided with insulating paper.
The method for fabricating a reactor having an overvoltage suppression according to claim 5, wherein the winding manners of the first coil and the second coil are layered and wound, and layers are disposed between layers There is high voltage cable paper.
A method of fabricating a reactor having an overvoltage suppression according to claim 5, wherein the protection resistor is connected in series on the parallel branch having the guard gap.