Connection dyn11 pad mounted transformer 2000kva is a three phase oil immersed distribution transformer with a pad mounted housing design. It can be directly installed on the outdoor ground and is widely used in industrial parks, commercial complexes and urban distribution networks, etc.
The core feature lies in the Dyn11 vector group, the high voltage side is connected in a triangle (D), the low voltage side is connected in a star (Y) with the neutral point being isolated, and the phase of the low-voltage side voltage lags behind that of the high voltage side by 30°. This connection method gives it unique advantages in the parallel operation of multiple transformers and in suppressing zero sequence current.
Under the operating condition of a star connection with neutral point grounding, the third harmonic current generated by nonlinear loads (such as frequency converters, LED driving power supplies, UPS front end rectifiers) will form a closed loop within the delta winding. The specific mechanism is as follows: The third harmonic currents are in phase with each other in terms of time phase and cannot flow out through the neutral line on the star side, but can circulate within the delta winding and dissipate their energy in the form of heat.
The measured data indicates that a connection dyn11 pad mounted transformer 2000kva can reduce the third harmonic distortion rate on the low voltage side by approximately 60% to 80%, thereby effectively purifying the voltage waveform on the low voltage bus and extending the service life of the subsequent precision electronic equipment.
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Product Name: |
Connection dyn11 pad mounted transformer 2000kva |
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Phase Number: |
3 Phase, |
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Frequency: |
50/60 Hz |
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Connection Symbol: |
Dyn11 |
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HV Voltage : |
11 kV / 12 kV / 20 kV / 33 kV |
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LV Voltage : |
0.415 kV / 0.433 kV / 0.690 kV |
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Tapping Range: |
±2×2.5% or ±5% |
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Cooling Class: |
ONAN / ONAF |
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No Load Loss : |
≤ 1800 W |
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Load Loss : |
≤ 16000 W |
Q: For a connection dyn11 pad mounted transformer 2000kva , why must special attention be paid to the eliciting method of its neutral point and grounding continuity instead of directly following the experience of small capacity transformers?
A: The rated current on the low voltage side of the connection dyn11 pad mounted transformer 2000kva has approached 3000A (taking 400V as an example), which is much higher than that of common small capacity equipment. Although the Dyn11 connection can isolate the zero sequence current on the high voltage side, the neutral point on the low voltage side needs to withstand extremely large unbalanced currents. For example, when providing power to a large number of single phase lighting or control circuits, the neutral current may reach more than 50% of the phase current.
If the practice of transformers below 1000kVA is blindly adopted in the project, using thinner neutral busbars or relying solely on a single grounding link will cause the neutral point to overheat, the connection terminals to melt, and even lead to severe neutral point displacement, burning out a large number of single phase equipment.
Therefore, when placing an order, it is necessary to clearly specify the requirement: the cross sectional area of the neutral busbar should be no less than 70% of the phase line (it is recommended to be of the same cross section), and a detachable grounding link plate and a neutral point overload monitoring device should be equipped. Ignoring this point, the connection dyn11 pad mounted transformer 2000kva may suffer a neutral point burnout accident within half a year of operation, while the routine factory tests cannot expose this hidden danger.
Ring Type
Terminal Type
Transformer Body
Address
No. 391, Jingqi Road, Yanpan Industrial Zone, Yueqing City, Zhejiang Province, China
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