The attached Figure shows the Dry-type distribution transformer equipped for winding varistors (red highlight) and traditional surge arresters (red dotted highlight)
Query: What are the detail schematics of the proprietary arrangement of the ABB for transient voltage protection of transformer windings using varistors ?
ABB Review dated 24 Aug 2020
ABB’s Transient Voltage Protection™ (TVP™) for distribution transformers places varistors strategically along the windings of the transformer in proprietary arrangements to limit transient overvoltages from reignitions that may occur inside of the breaker as well as from any amplified voltages from harmonic resonance inside the transformer.
References:
1) https://new.abb.com/news/detail/66745/safe-and-reliable-transient-protected-transformers
2) https://ieeexplore.ieee.org/document/7349213
The attached Figure shows the Schematic drawing of installation of RC snubbers at the transformer high voltage terminals
RC snubbers with internal resistors were used in the testing. A resistance of 30 Ω and a capacitance of 130 nF were used since these are standard values.
Using an inductive load of about half the rated power of the transformer, it was difficult to find a phase angle where reignitions occurred. A conclusion from this is that indeed the RC snubber does reduce the risk of occurrence of reignitions.
Further, in the cases where reignitions did occur, the number of them was low and in many cases no high over voltages were observed. However, in some cases virtual current chopping did occur and in this case very high voltages were generated.
Further on, increasing the load to the rated load of the transformer increased the risk of reignitions and reignitions followed by virtual current chopping.
Please continue reading here: https://ieeexplore.ieee.org/document/7349213
Transient voltage protection using varistors is a common practice to safeguard transformers from voltage surges and transients. Varistors, also known as Metal Oxide Varistors (MOVs), are nonlinear devices that have a high resistance at normal operating voltages but become conductive when subjected to high voltage transients.
The design of a transient voltage protection system typically involves the following considerations:
Varistor Selection: Choose varistors with appropriate voltage ratings and energy-handling capabilities. ABB, like other manufacturers, provides varistors designed for transient voltage protection applications. Consider factors such as the transformer's voltage rating and the expected magnitude of transient voltages.
Placement: Install varistors at strategic points within the transformer's electrical circuit to provide effective protection. Common locations include the primary and secondary sides of the transformer.
Surge Arresters: Varistors are often integrated into surge arrester devices. Surge arresters are designed to limit the amplitude of transient voltages and divert excessive energy away from the transformer. Ensure that the surge arrester design aligns with the transformer's characteristics.
Coordination with Other Protection Devices: Integrate transient voltage protection with other protective devices such as fuses, circuit breakers, and differential relays to create a comprehensive protective scheme for the transformer.
Grounding: Proper grounding is essential for effective transient voltage protection. Ensure that the transformer and associated protection devices are adequately grounded to facilitate the safe dissipation of transient energy.
For specific details on ABB's Transient Voltage Protection using varistors for transformers, I recommend consulting ABB's technical documentation, and product manuals.
Hi,
Could we have a zoom meeting for an in-depth discussion on the following documents for a systematic analysis of the proprietary system of ABB TVP ?
1) https://new.abb.com/news/detail/66745/safe-and-reliable-transient-protected-transformers
2) https://ieeexplore.ieee.org/document/7349213
I am interested in having an in-depth discussion on the analysis of varistors based ABB TVP and the other four methods of transient voltage protection of transformers such as 1) RC snubber circuits 2) Medium Voltage Chokes 3) Surge Arresters and 4) Transformer Hardening.
If possible, please do let me know when you are free to discuss in depth the analysis of ABB TVP of transformer on the zoom meeting session of around 40 minutes. We can have such subsequent zoom meeting if the situation demands.
I look forward to hearing from you.
Regards
Deepak Lathi
Whenever you are available for zoom meeting, I will explain you the paper (https://sci-hub.se/https://ieeexplore.ieee.org/document/7349213) in details which might help us in our collaborative analysis of the proprietary ABB TVP using varistors.
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