LB Oil immersed hair pin current transformer
Key attributes
| Brand | Wone |
| Model NO. | LB Oil immersed hair pin current transformer |
| Rated voltage | 40.5kV |
| Series | LB |
Product descriptions from the supplier
Product introduction:
LB series current transformers are oil impregnated paper insulated, vertical structure to meet the IEC/IEEE stan dard. The series connected transformer in the line has the functions of electric energy measurement, metering, relay protection and transient protection.
Product features:
●LB series current transformers are of oil immersed fully sealed insulation structure. The primary winding is U type. The body is fixed at the bottom of the box. The main insulation is capacitive oil paper insulation, which is wrapped around the primary winding with high-voltage cable paper. Several capacitance screens are set between them. The inner screen is connected to the high potential, and the outer screen can be grounded.
●The upper part of the oil tank is equipped with a porcelain bushing. The primary outlet terminal is on the top of the porcelain bushing. The series and parallel connection are external exchange devices, that is, they can be exchanged outside the porcelain bushing.
●The stainless steel expander is used as the oil compensation device to ensure the oil quality. The oil level indica tion of the product is indicated by the eye-catching displacement indication of the upper window of the expander.
●The product can be equipped with 4-6 secondary windings. The secondary measurement windings made of microcrystalline alloys with high magnetic conductivity can ensure the measurement accuracy to reach class 0.2 or 0.2S × The secondary winding of 600A and above current transformer measurement level has taps to achieve two current ratios.
●The secondary terminal box is cast with aluminum alloy as a whole, with a dust-proof, waterproof and breathable sealing structure
●The connection between product parts adopts argon arc welding, and the whole assembly is filled with high-pressure nitrogen for leak detection, which fundamentally solves the problem of oil leakage of oil immersed products.
●The shell, base and junction box are all made of aluminum alloy. The expander and nameplate are made of stainless steel. All exposed parts will never rust.
●The product is maintenance free.
Remark: Approximate dimensions and weights for special requirements, please consult us.
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Related Knowledges
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Neutral point grounding operation mode for 110kV～220kV power grid transformersThe arrangement of neutral point grounding operation modes for 110kV～220kV power grid transformers shall meet the insulation withstand requirements of transformer neutral points, and shall also strive to keep the zero-sequence impedance of substations basically unchanged, while ensuring that the zero-sequence comprehensive impedance at any short-circuit point in the system does not exceed three times the positive-sequence comprehensive impedance.For 220kV and 110kV transformers in new constructi01/29/2026 -
Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr01/29/2026 -
Why Must a Transformer Core Be Grounded at Only One Point? Isn't Multi-Point Grounding More Reliable?Why Does the Transformer Core Need to Be Grounded?During operation, the transformer core, along with the metal structures, parts, and components that fix the core and windings, are all situated in a strong electric field. Under the influence of this electric field, they acquire a relatively high potential with respect to ground. If the core is not grounded, a potential difference will exist between the core and the grounded clamping structures and tank, which may lead to intermittent discharge.I01/29/2026 -
Understanding Transformer Neutral GroundingI. What is a Neutral Point?In transformers and generators, the neutral point is a specific point in the winding where the absolute voltage between this point and each external terminal is equal. In the diagram below, pointOrepresents the neutral point.II. Why Does the Neutral Point Need Grounding?The electrical connection method between the neutral point and earth in a three-phase AC power system is called theneutral grounding method. This grounding method directly affects:The safety, reliabilit01/29/2026
