CN214377959U - Saturable reactor of high-voltage direct-current transmission converter valve - Google Patents

Abstract

The utility model relates to a high voltage direct current transmission converter valve saturable reactor, saturable reactor is external to have thyristor return circuit and valve tower cooling circuit, saturable reactor includes metal winding, flexible cooling pipeline, insulating part and iron core, the coiling of flexible cooling pipeline is in metal winding's the outside, metal winding and the common pouring of flexible cooling pipeline are in the insulating part, and flexible cooling pipeline stretches out the insulating part, the iron core sets up the outside at the insulating part, the intussuseption of flexible cooling pipeline is filled with the coolant liquid, flexible cooling pipeline links to each other with valve tower cooling circuit, metal winding links to each other with the thyristor return circuit. Compared with the prior art, the utility model has the advantages of the radiating effect is good, effectively weaken vibrations conduction, reduce part fault rate.

Description

Saturable reactor of high-voltage direct-current transmission converter valve

Technical Field

The utility model belongs to the technical field of the high voltage direct current transmission protection technique and specifically relates to a high voltage direct current transmission converter valve saturable reactor that can adopt the installation of shock attenuation fixed mode is related to.

Background

In a high-voltage direct-current transmission converter valve, a saturable reactor is an important component and is generally connected in series with an anode of a thyristor. The saturable reactor plays a role in limiting the change rate of current flowing through the thyristor and bearing main voltage stress when the converter valve receives lightning impulse or steep wave impulse, thereby protecting the thyristor.

At present, the existing converter valve saturable reactor is generally cooled by cooling liquid, and heat brought by resistance loss in a coil and hysteresis loss and eddy current loss in an iron core is taken away. The saturable reactor widely used at present has a structure as shown in fig. 1, and adopts a hollow metal winding, and an insulating material is poured outside the winding and surrounds an iron core at the outside. The cooling circuit passes through the hollow core of the winding. The problems with this type of reactor are mainly twofold:

on the one hand, the heat generated by the iron core is partly conducted to the cooling liquid through the insulation material poured by the winding, and partly diffused outwards through air convection. The insulating material between the hollow winding and the iron core is thick, and the heat conductivity of the insulating material influences the heat dissipation effect of the iron core, so that the temperature of the iron core is high, and the aging of the insulating material is easy to accelerate;

on the other hand, high-frequency mechanical vibration is generated under the action of electromagnetic force in the working state of the reactor, and the vibration may cause the water pipe joint between the hollow winding and an external cooling system to be loosened, so that cooling liquid is leaked.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high voltage direct current transmission converter valve saturable reactor that the radiating effect is good, effectively weaken vibrations conduction, reduce part fault rate in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

a saturable reactor of a high-voltage direct-current transmission converter valve is externally connected with a thyristor loop and a valve tower cooling loop, and comprises a metal winding, a flexible cooling pipeline, an insulating part and an iron core; the flexible cooling pipeline is wound on the outer side of the metal winding; the metal winding and the flexible cooling pipeline are cast in the insulating part together, and the flexible cooling pipeline extends out of the insulating part; the iron core is arranged on the outer side of the insulating part; the flexible cooling pipeline is filled with cooling liquid; the flexible cooling pipeline is connected with the valve tower cooling loop; the metal winding is connected with the thyristor loop.

Preferably, the flexible cooling pipeline is a cooling pipeline made of a flexible high-molecular waterproof insulating material.

Preferably, the insulator is made of epoxy resin.

Preferably, the flexible cooling pipeline is connected with the valve tower cooling circuit through a pipeline joint.

Preferably, the metal winding is electrically connected with the thyristor loop through a metal braided strap.

Preferably, the flexible cooling lines extend beyond the insulating member by more than 20 cm.

Preferably, the cooling liquid is deionized water.

Preferably, the saturable reactor is installed in the converter valve in a damping and fixing mode.

More preferably, the saturable reactor is installed in the converter valve through a damper.

More preferably, the saturable reactor is mounted in the converter valve through a spring.

Compared with the prior art, the utility model discloses following beneficial effect has:

firstly, the heat dissipation effect is good: the converter valve saturable reactor adopts the arrangement that the winding is arranged inside and the flexible cooling pipeline is arranged outside, and the winding and the cooling liquid pipeline are jointly poured in the insulating material; an iron core is fixed on the outer side of the insulating part; the flexible cooling liquid pipeline is tightly attached to the metal winding in structural design, and simultaneously is close to the iron core as much as possible, so that heat generated by the iron core can be taken away.

Secondly, effectively weakening vibration conduction: the converter valve saturable reactor adopts a flexible cooling pipeline, and the flexible cooling pipeline exceeds an insulating part by a certain length and then is connected with a valve tower cooling loop; meanwhile, the saturable reactor is arranged on the converter valve in a shock absorption mode such as a shock absorber or a spring, so that the shock transmission of the shock to the outside is reduced while the shock amplitude of the reactor is increased, the probability that the reactor and elements in the valve tower break down due to the shock is facilitated, and the problem that the reactor in the prior art is loosened due to the fact that the self shock is transmitted to the connection position between the reactor and an external cooling system through the rigid winding is effectively solved.

Drawings

FIG. 1 is a schematic diagram of a converter valve liquid cooling saturable reactor in the prior art;

FIG. 2 is a schematic structural diagram of a middle saturable reactor of the present invention;

FIG. 3 is a side view of the middle saturable reactor of the present invention;

fig. 4 is a top view of the middle saturable reactor of the present invention;

fig. 5 is a schematic view of the cross-sectional structure a-a in fig. 4.

The reference numbers in the figures indicate:

1. metal winding, 2, flexible cooling pipeline, 3, insulating part, 4, iron core.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

The utility model discloses a converter valve saturable reactor is applied to in the 500kV direct current transmission converter valve that has adopted liquid cooling system. The direct current transmission converter valve is generally connected with a saturable reactor in series at the anode of each thyristor, and the utility model discloses a saturable reactor is the demand in this respect that aims at. The saturable reactor is described in detail below:

a saturable reactor of a high-voltage direct-current transmission converter valve is structurally shown in figures 2, 3, 4 and 5, the saturable reactor is externally connected with an existing thyristor loop and a valve tower cooling loop, the saturable reactor comprises a metal winding 1, a flexible cooling pipeline 2, an insulating part 3 and an iron core 4, the flexible cooling pipeline 2 is wound on the outer side of the metal winding 1, the metal winding 1 and the flexible cooling pipeline 2 are jointly cast in the insulating part 3, the flexible cooling pipeline 2 extends out of the insulating part 3, the iron core 4 is arranged on the outer side of the insulating part 3, cooling liquid is filled in the flexible cooling pipeline 2, the flexible cooling pipeline 2 is connected with the valve tower cooling loop, the metal winding 1 is connected with the thyristor loop, the metal winding 1 also extends out of the insulating part 3, but only has insulation requirements, an air gap also meets the insulation requirements under the condition of linear extension, therefore, certain length change can be carried out according to external electrical connection, the protruding portion may not reduce the pitch.

The flexible cooling pipeline 2 is connected with the valve tower cooling loop through the pipeline connector, no other rigid connection is arranged between the connector and the reactor body except for the connection with the flexible cooling pipeline 2, so that the flexible connection between the flexible cooling pipeline 2 and the valve tower cooling pipeline is ensured, and the transmission of vibration to the pipeline connector is reduced by utilizing the flexible cooling pipeline 2. The metal winding 1 does not bear the function of a cooling pipeline in the traditional saturable reactor, has no special requirements on design, and can realize the body function of the metal winding.

The saturable reactor is installed in the converter valve in a damping and fixing mode, such as a damper, a spring and the like, the damper can adopt a reactor damping and noise reducing device described in Chinese patent CN204828480U, and the metal braided belt meeting the current-carrying requirement is adopted for electrical connection between the metal winding 1 and the thyristor loop.

The fact that the length of the flexible cooling line 2 extending beyond the insulating element 3 exceeds 20cm already ensures good damping, so that the connection to the valve tower cooling circuit is not specifically defined. Since the mass of the reactor body is extremely large compared to the cooling pipe of the protruding portion, vibration approximately regarded as a fixed amplitude acts on the cooling pipe protruding portion. The reaction is carried out by a deflection calculation formula of the simple load lower beam, and the acting force of the cooling pipe and the fixed end of the external cooling loop is inversely proportional to the third power of the extending length, so that the longer the extending length is, the more the vibration transmission is favorably reduced. However, the self weight of the pipeline linearly increases along with the lengthening of the extending part, and in order to ensure that the pipeline is not broken due to self-weight stretching, 20cm is a reasonable length. In practical application, the requirement of shock absorption should be ensured to be met, and meanwhile, the self-weight cannot obviously extend (within 10%). The breaking elongation of the ethylene propylene diene monomer is generally over 100 percent, and if the breaking elongation of the used material is less than 100 percent, the elongation is required to be not more than 10 percent of the breaking elongation in practical use.

The flexible cooling pipeline 2 in this embodiment is made of a flexible polymer waterproof insulating material, specifically EPDM (ethylene propylene diene monomer), and dithiodimorpholine and TMTD are used as a vulcanization system.

The insulating member 3 in this embodiment is made of epoxy resin.

The cooling liquid in the embodiment adopts deionized water, the reactor cooling liquid is deionized water, and the electric conductivity is less than 0.5 mu S/cm at the temperature of 45 ℃. In the case of an operating current of 3000A, the iron loss is about 310W, the copper loss is about 670W, and the total heating power P is 980W, which are obtained from the factory test results and simulation calculation of the reactor with the same current. Setting the average reactor flow a to about 10L/min, for the one adopted

The tube corresponds to a flow rate of about 0.943 m/s. The specific heat capacity of the cooling water is 4.2 multiplied by 103J/(kg DEG C), and the temperature rise of the cooling water after passing through the reactor is about 1.4 ℃, so that effective heat dissipation can be realized. For the reactor with higher working current, the flow rate of the cooling water should meet the condition that the flow rate a is more than or equal to 0.01P (flow unit L/min, power unit W).

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A saturable reactor of a high-voltage direct-current transmission converter valve is externally connected with a thyristor loop and a valve tower cooling loop and is characterized by comprising a metal winding (1), a flexible cooling pipeline (2), an insulating part (3) and an iron core (4); the flexible cooling pipeline (2) is wound on the outer side of the metal winding (1); the metal winding (1) and the flexible cooling pipeline (2) are cast in the insulating part (3) together, and the flexible cooling pipeline (2) extends out of the insulating part (3); the iron core (4) is arranged on the outer side of the insulating part (3); the flexible cooling pipeline (2) is filled with cooling liquid; the flexible cooling pipeline (2) is connected with a valve tower cooling loop; the metal winding (1) is connected with the thyristor loop.

2. The saturable reactor for the high-voltage direct current transmission converter valve according to claim 1, wherein the flexible cooling pipeline (2) is a cooling pipeline made of flexible high polymer waterproof insulating material.

3. The saturable reactor for HVDC converter valves according to claim 1, characterized in that the insulator (3) is specifically made of epoxy resin.

4. The saturable reactor for the HVDC converter valve according to claim 1, wherein the flexible cooling pipeline (2) is connected with the valve tower cooling circuit through a pipeline joint.

5. The saturable reactor for the HVDC converter valve according to claim 1, wherein the metal winding (1) is electrically connected with the thyristor loop through a metal braided strap.

6. The saturable reactor for HVDC converter valve according to claim 1, wherein the flexible cooling line (2) extends beyond the insulator (3) by more than 20 cm.

7. The saturable reactor for the HVDC converter valve according to claim 1, wherein the coolant is deionized water.

8. The saturable reactor for the high-voltage direct current transmission converter valve according to claim 1, wherein the saturable reactor is installed in the converter valve in a damping and fixing mode.

9. The saturable reactor for a high voltage direct current transmission converter valve according to claim 8, wherein the saturable reactor is installed in the converter valve through a shock absorber.

10. The saturable reactor for a high voltage direct current transmission converter valve according to claim 8, wherein the saturable reactor is installed in the converter valve through a spring.

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