ANSYS电力变压器仿真案例

Cut-away of typical 3ph oil-filled power transformer
Oil-flow though winding having LV layers and HV disks
电力变压器温升计算
—模型介绍
• Maxwell 3D 涡流场求解器 • 频率 = 60Hz sinusoidal • 铁心相对磁导率= 300 • 铁心电导率= 0 • 只考虑LV 线圈集肤效应和
BranchCurrent(VI9) Setup1 : Transient
BranchCurrent(VI10) Setup1 : Transient
BranchCurrent(VI11) Setup1 : Transient
BranchCurrent(VI12) Setup1 : Transient
Calculate Field
Calculate Field Accuracy
Error Acceptable?
Yes
No Refine Mesh
Display Simulation Results
Adaptive meshing is available for all non-transient solvers
Simplorer
System / Circuit
IA
A
IB
A
IC
A
PMSYNC
ICA: PP := 6
Torque
J
A
D2D
GAIN
PExprt
Magnetics Design
ANSYS Mechanical
Thermal / Stress
Maxwell 2D/3D
Electromagnetics / Forces / Losses
20.00
Time [ms]
30.00
Curve Info
Current(HV) Setup1 : Transient
BranchCurrent(VI1) Setup1 : Transient
BranchCurrent(VI2) Setup1 : Transient
BranchCurrent(VI3) Setup1 : Transient
2.00 0.00
Curve Info
NodeVoltage(IH1_delta) Setup1 : Transient
NodeVoltage(IH1_tease) Setup1 : Transient
NodeVoltage(IH2_delta) Setup1 : Transient
NodeVoltage(IH2_tease) Setup1 : Transient
电力变压器温升计算
—油流结果
LV 层绕组- 在绕组顶部的油流分析结果
电力变压器温升计算
—温升结果
温度分布(in Kelvin)
mechanical stress analysis
Maxwell – Mechanical Two-way Coupling
Stress Analysis
Two way coupling non-transient solvers and ANSYS stress solver is possible in R14
…
传统设计流程
概念设计
初始设计
制作原型
原型测试
否
合格?
是
生产
传统设计流程
几轮调整 调整=
ANSYS设计理念：仿真驱动产品开发
概念设计
仿真驱 动研发
物理样机 生产
虚拟样机替代传统原型样机试制 仿真分析模拟真实测试项目
大大地提高了产品开发的一次成功率
ANSYS设计工具
Q3D
Parasitics extractor
铁心 高压线圈 低压线圈 左拉板
下夹件
电力变压器温升计算
—网格
CFD 网格 • 单元数: 12 M • 单元类型 : 主要是六
面体 • 交界面上流体与固体
网格节点对应
导体网格
绝缘件网格
铁心网格
流体网格
多物理场耦合流程
电磁 → 热、温升 or 结构
Click to edit Master text styles
Stress Analysis
B Field
Force Distribution
Field Calculation Updated Mesh
Magnetic Forces
Stress Calculation
Displacements
Displacements of mesh nodes
vibro-acoustic issues
1e-006u
涌流计算
Magnetizing current at
start
Inrush current at switching
event
Return to magnetizing current at end
Fluid Flow in Oil Filled Transformer 变压器油流计算
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
Time [ms]
涌流计算
原边角接绕组：外电路建模
LabelID=IV_A
Rwinding
LWindingA
LWindingA_extend
Rwinding
LWindingB
LWindingB_extend
Rwinding
ANSYS Fluent
Fluid Flow / Thermal
Model order Reduction Co-simulation Field Solution
Model Generation
ANSYS核心技术之一：自动自适应网格剖分
Geometry (no mesh data)
Create Initial Mesh
ANSYS电力/高压产品研发
内容提要
ANSYS电力产品设计解决方案 ANSYS应用案例
结论
高压产品设计中的技术挑战
电场强度 绝缘设计 电位分布 电容计算 …
电场
磁场
磁场强度 涡流损耗
电动力 材料非线性
..
结构强度 应力和形变 频谱分析 热分析 屈曲分析 ….
结构场
流体场 温度场
温升计算 散热分析 气体/液体流动
5.6010
20.00
10.00
Curve Info
Current(Wye_A) Setup1 : Transient
Current(Wye_B) Setup1 : Transient
Current(Wye_C) Setup1 : Transient
-6.00
0.00
2.00
4.00
06.0.000
LWindingC
LWindingC_extend
+ + +
+
+ + +
+
+ + +
+
V S_232
V S_260
V S_278
V S_279
LabelID=IVswtich
1ohm
+
1V
0V
LabelID=V270
0
Model V
vmodel1
Model V
vmodel2
V S_280
V S_281
BranchCurrent(VI4) Setup1 : Transient
BranchCurrent(VI5) Setup1 : Transient
BranchCurrent(VI6) Setup1 : Transient
BranchCurrent(VI7) Setup1 : Transient
BranchCurrent(VI8) Setup1 : Transient
Force Distribution
Maxwell
ANSYS Mechanical
Deformed Mesh
Maxwell – Mechanical Two-way Coupling
Stress Analysis
Example: Air inductor
Maxwell – Mechanical Two-way Coupling
Approach:
The Force distribution is transferred as load into ANSYS Mechanical The node displacement information is sent back to Maxwell as deformed
mesh
绝缘子污秽计算
• 采用半导体层模拟污秽层 • 计算漏电流和电场分布
涡流损耗计算
3kW solid
2kW slotted
14
Current in LV Parallel Disks 低压线圈不平衡电流
• LV has 15 parallel disks in external circuit • Note significant radial flux crossing disk1 and disk 15 • Will cause extra current in parallel disks
BranchCurrent(VI13) Setup1 : Transient
BranchCurrent(VI14) Setup1 : Transient
BranchCurrent(VI15) Setup1 : Transient
max 1581.8327 3283.5012 2366.1423 2623.5965 2608.6789 2643.0542 2656.7616 2664.7992 2666.1958 2663.1977 2652.7513 2637.4442 2600.8232 2615.6017 2319.0715 3339.4979
40.00
50.00
• Unbalanced currents in LV conductors • Highest current in top and bottom disks
短路电动力
Y1 [kV] Y1 [A] OVC(Hoop_Stress_Wye_B)
Ansoft LLC 6.00
4.00
1500.00 12.00
14.00
1000.00
16.00
500.00
Maxwell2DDesign_delay
-20.00
0.00 -500.00
-30.00 0.00
2.00
4.00
-1000.00 6.00
-1500.00
8.00 Time [ms]
10.00
12.00
14.00
16.00
-2000.00
Example of coupled approach for vibro-acoustic analysis
The domain includes a combination of 3 physics: a electro-magnetic transformer, an aluminium shield (tank) (deformable solid), a volume of air (acoustic environment).
Current in LV Parallel Disks 低压线圈不平衡电流
Y1 [A]
Ansoft LLC 4000.00 3000.00 2000.00 1000.00 0.00 -1000.00 -2000.00 -3000.00 -4000.00 0.00
10.00
Winding Currents
绝缘设计
Critical path for creep stress “line1”
电位通过调节绝缘间隙，降低电场强度
电场计算
• Electric field analysis of HV bushings
• Can consider capacitive grading foils
8.00
10.00
Time [ms]
-10.00
Maxwell2DDesign_exp
Current Secondary Wye
Maxwell2DDesign_exp
Ansoft LLC 2500.00
2000.00
Hoop Stress - Wye Ph B
Curve Info OVC(Hoop_Stress_Wye_B) Setup1 : Transient
NodeVoltage(IH3_delta) Setup1 : Transient
NodeVoltage(IH3_tease) Setup1 : Transient
-2.00
-4.00
Voltage Primary
max 4.2310 5.6305 4.1838 5.5564
4.23A52nsoft LLC 30.00
邻近效应 • 采用¼ 对称模型
• 模型中保留绝缘件，以便 直接导出到FLUENT
电力变压器温升计算
—损耗结果
损耗结果 • 铜耗：Maxwell直接计算
– HV winding = 6,252 W – LV winding = 26,438 W
上夹件 右拉板
• 附加损耗：在Fluent设置
– 铁耗= 10,000 W – 上夹件 = 1,000 W – 下夹件 = 1,000 W – 左拉板 = 500 W – 右拉板 = 1,000 W