CN201549353U - Voltage equalizing device for UHV dry-type smoothing reactor - Google Patents

Abstract

The utility model discloses a voltage-equalizing device of an extra-high voltage dry-type smoothing reactor. The device is characterized in that: the voltage-equalizing device comprises a set of sectional-type upper voltage-equalizing rings which are arranged at the tip of the upper side of the reactor body, at least one set of sectional-type lower voltage-equalizing rings which are arranged at the tip of the lower side of the reactor body; the tip of the lower side of the reactor body is connected with a support column insulator to be used as grounded main insulation; the sectional-type upper/lower voltage-equalizing rings divide a whole circular ring into a plurality of arc sections and are respectively connected to circular tips at upper/lower sides of the reactor body. The voltage-equalizing device of the extra-high voltage dry-type smoothing reactor realizes uniformization of the end electric field distribution of the dry-type smoothing reactor and the support column insulator to the utmost extent, inhibits the corona and the electrical erosion damage of the dry-type smoothing reactor tip and the support column insulator high-voltage side, protects a seal structure of the tip, and increases the reliability of safe running of the dry-type smoothing reactor.

Description

Voltage equalizing device for UHV dry-type smoothing reactor

technical field

The utility model relates to a voltage equalizing device for a direct-current extra-high voltage (±800kV) and a dry-type smoothing reactor insulated with a pillar insulator.

technical background

With the growth of the national economy, China's demand for electricity continues to increase. China's natural conditions and the distribution characteristics of energy and load centers make ultra-long-distance, ultra-large-capacity power transmission inevitable. In order to reduce the loss of transmission lines and save precious land resources, a cost-effective UHV DC transmission method is needed.

Smoothing reactor is one of the most important equipment of ±800kV DC transmission project. It is used to limit the overcurrent when the voltage collapses on the inverter side, stabilize the ripple in the transmitted DC current, and prevent the overvoltage from invading the converter station along the DC line. It plays an important role in affecting the insulation of the converter valve and maintaining the uninterrupted DC current under low load conditions.

The smoothing reactor is at a high potential, and the electric field at its end is concentrated, so it needs to be improved by using a shielding device. As the ground insulation support of the dry-type smoothing reactor, the post insulator is affected by the distributed impedance of the busbar, reactor and earth in the DC transmission system, which makes the electric field distortion on the busbar side of the post insulator more serious, especially near the busbar and reactor side Between the sheds near the flange, the electric field intensity is several times higher than that in the middle shed. If the grading ring is not properly configured, corona discharge and electrical erosion will occur in these areas. At the junction of the post insulator fittings and the mandrel, since the end of the fittings forms a weak interface with the silicone rubber sheath, and the electric field is very concentrated, it is susceptible to electrical corrosion damage and accelerates the deterioration of the insulator under polluting conditions such as rain, fog, wind and dust. Even cause the insulator to break. Therefore, it is of great significance to improve the safe and reliable operation of the UHV smoothing reactor by rationally and scientifically configuring the voltage equalizing device and improving the electric field distribution at the end of the dry-type smoothing reactor and the end of the post insulator.

Contents of the invention

The purpose of this utility model is to provide a voltage equalizing device for dry-type smoothing reactors in UHVDC power transmission systems. Corona and electric corrosion damage at the end of the smoothing reactor and the high-voltage side of the post insulator protect the sealing structure at the end and effectively improve the safe operation reliability of the dry-type smoothing reactor.

In order to achieve the above object, the utility model is realized by taking the following technical solutions:

A voltage equalizing device for an UHV dry-type smoothing reactor, which is characterized in that it includes a group of segmented upper pressure equalizing rings arranged at the upper end of the reactor body, and a set of segmented upper pressure equalizing rings arranged at the lower end of the reactor At least one group of segmented lower voltage equalizing rings, the lower end of the reactor body is connected to the post insulator as insulation to the ground, the segmented upper and lower voltage equalizing rings are divided into several arc segments of the circular integral ring, And respectively connected to the upper and lower round ends of the reactor body.

In the above scheme, two sets of segmented lower equalizing rings are arranged at the lower end of the reactor body, one set is flush with the lower end of the smoothing reactor, and the other set is placed in the smoothing reactor Below the lower end. Or set a set of segmented lower equalizing rings at the lower end of the reactor body, and at the same time set small round equalizing rings on the high voltage side of each post insulator. The small circle pressure equalizing ring is a closed ring or an open ring.

The segmented upper and lower pressure equalizing rings divide the circular integral ring into 6 to 9 segments. The lower end of the reactor body is connected to a post insulator as insulation to the ground, and the post insulator is a straight support structure or a diagonal support structure.

The applicant simulated and calculated the electric field distribution of the dry-type smoothing reactor of the UHV DC transmission equipment, and confirmed that the voltage equalizing device of the dry-type smoothing reactor for the UHV DC transmission system of the utility model has a reasonable configuration structure and can maximize To maximize the uniformity of the electric field distribution at the end of the dry-type smoothing reactor and post insulator, effectively suppress the corona and electric corrosion damage at the end of the dry-type smoothing reactor and the high-voltage side of the post insulator, and protect the sealing structure of the end. Improve the safe operation reliability of the dry smoothing reactor.

Description of drawings

Fig. 1 is an embodiment of the voltage equalizing device of the straight-supported dry-type smoothing reactor of the present invention. In the figure: 1. Segmented voltage equalizing ring at the upper end; 2. Reactor body; 3. Segmented voltage equalizing ring at the lower end; 4. Post insulators.

Fig. 2 is another embodiment of the voltage equalizing device of the straight-supported dry-type smoothing reactor of the present invention. Among the figure: 5, small circle equalizing ring.

Fig. 3 is an embodiment of the voltage equalizing device of the utility model's diagonally braced dry-type smoothing reactor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

Figures 1 to 3 are three different embodiments of the present utility model, and their common structure is: a group of segmented pressure equalizing rings 1 are arranged at the upper end of the reactor body 2; 2. At least one set of segmented pressure equalizing rings 3 is arranged at the lower end.

As shown in Figure 1, a set of segmented voltage equalizing rings 1 is arranged on the upper end of the reactor body 2, placed above the upper end of the smoothing reactor to shield the electric field at the upper end of the smoothing reactor. The lower end is equipped with two sets of segmented equalizing rings, one of which is flush with the lower end of the smoothing reactor, and the other set is placed under the lower end of the smoothing reactor. The bracket is connected to the upper and lower ends of the body 2 of the smoothing reactor, and has the same potential as the body of the smoothing reactor.

As shown in Figure 2, a set of segmented pressure equalizing rings 1 is arranged on the upper end of the reactor body 2; The arc segments of the segmented voltage equalizing rings 1 and 3 are connected to the upper and lower ends of the smoothing reactor with brackets, and are equipotential with the body of the smoothing reactor. The high-voltage side of each post insulator 4 is equipped with a small round pressure equalizing ring 5, and is connected to the flange of the high-voltage side of the post insulator 4 with a bracket, and is at the same potential as the flange.

The straight-supported UHV dry-type smoothing reactor in the embodiment shown in Fig. 1 and Fig. 2 can be composed of two reactors connected in series, and each reactor consists of eight post insulators 4 as insulation to the ground, and two bus post insulators. Post insulator 4 is porcelain or full composite or porcelain core composite insulator.

For the diagonally braced UHV dry-type smoothing reactor, a set of segmented voltage equalizing rings 1 is arranged at the upper end of the reactor body 2, and a set of segmented voltage equalizing rings 3 is arranged at the lower end, which are placed in the smoothing reactor Below the lower end of the device, arc sections 1 and 3 of the voltage equalizing ring are connected to the lower end of the body of the smoothing reactor with brackets, and are at the same potential as the body of the smoothing reactor. When the upper end is equipped with a rain cap and a muffler, the segmented pressure equalizing ring 1 may not be configured, as shown in Figure 3,

The diagonally braced UHV dry-type smoothing reactor shown in Figure 3 can also be composed of two reactors connected in series. Each reactor consists of twelve post insulators as insulation to the ground, and three bus post insulators.

The number of segments of segmented pressure equalizing rings 1 and 3 can be divided into 6 to 9 segments, and the ring diameter and pipe diameter can be determined according to the pressure equalizing shielding effect. Both segmented pressure equalizing rings 1 and 3 are made of metal materials.

The small circular pressure equalizing ring 5 can be a closed ring or an open ring, and the ring diameter and pipe diameter can be determined according to the pressure equalizing shielding effect.

Claims (6)

1. A voltage equalizing device for an UHV dry-type smoothing reactor, characterized in that it comprises a group of segmented upper pressure equalizing rings arranged at the upper end of the reactor body, At least one set of segmented lower voltage equalizing rings is provided at the bottom of the reactor. The lower end of the reactor body is connected to the post insulator as insulation to the ground. The segmented upper and lower voltage equalizing rings divide the circular overall ring into several arcs. segment, and are respectively connected to the upper and lower circular ends of the reactor body. 2. The voltage equalizing device of UHV dry-type smoothing reactor according to claim 1, characterized in that two sets of segmented lower equalizing rings are arranged at the lower end of the reactor body, one of which is the same as The lower end of the smoothing reactor is flush, and the other group is placed under the lower end of the smoothing reactor. 3. The voltage equalizing device of UHV dry-type smoothing reactor as claimed in claim 1, characterized in that a group of segmented lower voltage equalizing rings are arranged at the lower end of the reactor body, and at the same time each The high-voltage side of the post insulator is provided with a small round pressure equalizing ring. 4. The voltage equalizing device of the UHV dry-type smoothing reactor according to claim 3, wherein the small circular voltage equalizing ring is a closed ring or an open ring. 5. The voltage equalizing device of UHV dry-type smoothing reactor according to claim 1, characterized in that, the segmented upper and lower voltage equalizing rings divide the circular integral ring into 6 to 9 segments. 6. The voltage equalizing device of UHV dry-type smoothing reactor according to claim 1, characterized in that, the lower end of the reactor body is connected to a post insulator as insulation to the ground, and the post insulator is a straight bracing structure or diagonal bracing structure.

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