產品簡介

Brief introduction to the products

SZ11型35KV級電力變壓器是在總結以往“7”型、“9”型電力變壓器設計制造經驗的基礎上更新換代的，新產品采用了新技術、新工藝、新材料。新組件、新結構，不僅節能節材，而且運行安全可靠，已在城鄉電網建設與改造工程項目中推薦使用。

SZ11 type 35KV Power Transformer upgrades on the basis of summarizing the design and manufacturing experience of the past “7" type and "9" type power transformers. The new product adopts new technologies, new workmanship, new materials, new components and new structure. It not only saves energy and materials but also makes the operation safer and more reliable, which has been recommended to use in urban and rural power grid construction and renovation projects.

型號及含義

Type Meanings

產品結構

Product Structure

鐵心設計時合理選擇磁通密度，保證正常工作電壓下有一定的裕度，在系統電壓偏高時不出現磁飽和現象，硅鋼片本身的磁滯振動小。鐵心材質選用優質冷軋晶粒取向硅鋼片；鐵心為三相三柱式、鐵心柱多級階梯圓柱形；全斜接縫階梯多級疊片、無孔綁扎；夾件可選板式或槽鋼結構，減少焊接量，增加夾件強度，并通過上下夾件的拉螺桿拉緊器身，結構簡單，增加繞組的抗短路能力；同時采取合理的減振措施。并控制疊片的參差離縫，使鐵心磁阻小，漏磁小。6300KVA及以下的鐵軛與心柱截面形狀相同，8000KVA及以上鐵軛為“D”型，以減少角重。降低損耗，最小級片加寬，增加鐵軛與夾件接觸面，改善鐵軛的夾緊狀態。

繞組內部采用油導向結構／軸向油道，有利于散熱，可大幅度降低銅油溫差，使內部各區域的熱油能充分的冷卻，降低繞組的最熱點溫升；無載調壓變壓器其分接范圍僅為±3×2.5%。故不獨立設置調壓繞組，分接引線置于主線圈本體中部，從而簡化結構。高低壓繞組設計時采用新開發的主縱絕緣結構，嚴格控制安匝分布／沖擊分布．降低材料用量；低壓繞組直接繞制在高強度的絕緣紙筒上，高、低壓繞組在繞制時采用輻向、軸向壓緊裝置，增加繞組的壓緊力，減少運行中的收縮：并用內外撐條進行緊固，加強支撐，提高繞組穩定性。防止其失穩變形：繞組可按要求進行浸漆處理和分相整體套裝；且改進壓板結構，加強端部壓緊，以增強機械強度，提高承受短路能力。

改進引線夾緊結構，采用木材與綁扎相結合的形式，使引線固定牢固不位移和松動。

器身采用新的絕緣框架，進行復合場強計算，保證足夠的絕緣強度，具有較高的填充系數：嚴格控制器身干燥結束后在大氣暴露的時間，避免受潮：器身與油箱采用“剛性定位”，提高產品運輸中承受沖擊的能力。

油箱按免吊心結構設計，現場可直接安裝。布局緊湊，造型美觀、結構新穎，可為鐘罩式或折邊瓦楞式結構（平頂式），簡化結構便于加工；箱體選用寬幅鋼板，減少焊縫，增加機械強度；所有密封面（箱沿、法蘭）進行機械加工，采用“O”型密封結構防止滲漏；變壓器油箱及散熱器應能承受0.05Mpa的壓力，并無滲漏、損傷現象。

主體上的附件應有：端子箱采用不銹鋼箱體。密封良好，便于接線：溫度計座（焊在箱蓋上）二根。置于油箱長軸方向的兩端；氣體繼電器、溫度計、壓力釋放閥引線電纜支架應固定在箱體上，接線引到接線端子箱內。但所有裝在變壓器本體上的附件，最低部件不得低于箱底水平線。

When the iron core is designed, the magnetic flux density should be reasonably selected to ensure that there is some margin under normal working voltage and no magnetic saturation phenomenon when the system voltage is a little high. Magnetic hysteresis vibration of the silicon steel sheet itself is light. The material of the iron core is good quality cold-rolled crystallin grain oriented silicon steel sheet. The iron core is three-phase three -column type and core column multi-ladder cylindrical, totally inclined joint ladder multi-level lamination and no hole binding. The clamping piece can be of plate structure or channel steel structure, to reduce the amount of the welding and increase its strength, and tighten the body through the pulling screw of the upper and lower clamping pieces. The structure is simple and anti-short circuit capacity of the winding is improved. At the same time, take reasonable measures for damping. In addition, control the varied spaced seams of the lamination to decrease the magnetic resistance of the iron core and reduce the magnetic leakage. 6300KVA and the below have the same section shape with core column, and 8000KVA and the above yoke are "D" type to reduce the angle weight. Reduce the loss, widen the smallest class film, increase the contact surface between yoke and clamping piece and improve the clamping state of the yoke.

Internal part of the winding adopts the oil guide structure/ axial direction oil duct which is conducive to heat dissipation and greatly reduced the copper oil temperature, so that the hot oil energy of all the internal regions can be fully cooled to reduce temperature rise of the hottest spot of the winding. The tapping scope of the no-load voltage regulating transformer is only ±3x2.5%; therefore, the voltage regulating transformer winding is not set up independently, and the tapping lead is placed in the center of main coil so as to simplify the structure. The design of the high and low voltage winding adopts the newly developed principal longitudinal insulation structure. to strictly control ampere turns / impact distribution distributing and reduce the amount of the used materials during operation; and use the internal and external supporting strip to tighten, reinforce the support, improve the stability of the winding and prevent instability and deformation. The winding can be given paint dip treatment and split-phase integration packaging; improve the structure of pressing plate and strengthen the end compression to enhance mechanical strength and improve the capability to withstand short circuit.

Improve the clamping structure of lead wire and adopt the form of combining wood with binding to make the lead wire firmly fix without displacement nor loosening.

The body adopts the new insulation frame, and composite field calculation is adopted to ensure adequate insulation strength, which has relatively high filling coefficient. Strictly control the time of the body after drying exposed in the atmosphere and to avoid moisture; the body and the tank adopt "Rigidly Positioning" to improve the capacity of product against the impact during the transportation.

The tank is designed based on the hanging core free structure, which can be installed directly on site. It has compact layout, beautiful appearance and novel structure, it also can be bell or folding corrugated structure (flat-top type), which simplifies the structure convenient for processing. The box body selects wide steel plate to reduce the weld joint and enhance the mechanical strength; mechanical processing is made to all the sealed surfaces (box edge and flange), and "O" type seal structure is adopted to prevent the leakage; the oil tank and the radiator of the transformer should be able to withstand 0.05Mpa pressure, and there is no leakage and damage.

Accessories of main body should contain: the terminal box adopts the stainless steel box with good sealing and easy for wiring; two thermometer seats (soldering on the cover) are placed on the two ends of the macro axis of the oil tank; The lead cable support of gas relay, the thermometer, and pressure release valve should be fixed on the box, the lead is connected into the terminal box. However, the lowest part of all the accessories installed on the body of the transformer can not be lower than the horizontal line on the bottom of box.

技術參數

Technical Parameters

訂貨須知

Order Information

訂貨方在訂貨時應給本公司提供與產品有關的下列數據

1．型號規格

2．額定容量

3．相數

4．頻率

5．電壓組合／分接范圍

6．聯結組標號

7．短路阻抗

8．油箱結構／冷卻方式

9．其它特殊要求／使用條件

The ordering party should provide us with the following data concerning the products:

1. Model and Specification

2. Rated Capacity

3. Phase No

4. Frequency

5. Voltage Combination/ Tapping Range

6. Linkage Group Symbol

7. Short Circuit Impedance

8. Oil Tank Structure/ Cooling mode

9. Other Special Requirements / Application conditions