| Brand | Wone |
| Model NO. | LVQB SF6 gas insulated current transformer |
| Rated voltage | 40.5kV |
| Series | LVQB |
Product introduction:
LVQB series current transformers are SF6 gas insulated, inverted structure to meet the IEC/IEEE standard.The series connected transformer in the line has the functions of electricenergy measurement, metering, relay protec tion and transient protection.
Product features:
●The primary winding is of through type conductive rod structure with good dynamic and thermal stability.
●The maximum thermal stability current is 63kA/3s (when the primary winding is in series).
●The primary winding passes through the center of the secondary winding without the influence of magnetic flux leakage, and the measurement accuracy reaches 0.1 and 0.2s
●The upper shell is of aluminum alloy welding structure, and the top is equipped with a metal explosion-proof disc. If the internal high-energy discharge occurs, when the gas pressure exceeds 1.0MP a, the explosion-proof disc will break, so as to achieve the purpose of pressure release, improve product safety, and there is no danger of explosion.
●The secondary winding is poured into the aluminum shield housing with organic materials, and the measuring and protection lines at the secondary side will not be subject to electrical attack due to insulation breakdown.
●The optimized electrode shielding structure improves the internal and external electric field distribution of the product, and the insulation performance is excellent. The local discharge test is conducted under the power frequency test voltage.
●The cast aluminum footing is directly cast on the external insulating bushing, and the bottom plate bolt is fixed with the footing from the bottom up to avoid water ingress and ponding from the base fastener. The secondary outlet box is cast with stainless steel or aluminum alloy. The dust-proof, waterproof and breathable sealing structure meets the requirements of IP55.
●The secondary terminals for users to connect are Phoenix special terminal blocks, which are more convenient and fast to plug, pull and connect.
●The sealing ring is made of ethylene propylene diene monomer (EPDM) and imported fluor silicone rubber. It is suitable for areas with high and low temperature changes and harsh ambient temperatures. The annual air leak age rate is less than 0.5%.
●The product performance remains unchanged after rigorous transportation vibration test.
●The shell, base and junction box are all made of aluminum alloy. The nameplate is made of stainless steel. All exposed parts will never rust. The base is equipped with a density meter, which can display the gas pressure inside the transformer (the displayed value is automatically converted to the internal gas pressure at 20 ℃) and density. When the internal pressure of the transformer drops to the alarm pressure, it will provide a signal and require gas supplement.
Remark: Approximate dimensions and weights for special requirements, please consult us.
-
40.5kV 72.5kV 126kV 145kV Oil immersed current transformer
-
110kV and 50kV AC SF6 Gas Insulated Voltage Transformer
-
Inductive Voltage Transformer for GIS
-
JLD Combined instrument transformer
-
Station Service Voltage Transformer
-
LB Oil immersed hair pin current transformer
-
TYD Capacitor voltage transformer
-
Why Regular Transformer Maintenance Matters: 5 Serious Consequences of Neglecting ItI. Allowable TemperatureWhen a transformer is in operation, its windings and iron core generate copper loss and iron loss. These losses are converted into heat energy, causing the temperature of the transformer's iron core and windings to rise. If the temperature exceeds the allowable value for a long time, the insulation will gradually lose its mechanical elasticity and age.The temperature of each part of the transformer during operation is different: the winding temperature is the highest, folRockwell09/12/2025 -
How to Implement Condition-Based Maintenance for Power Transformers? A Complete 4-Step Process Analysis1. Definition of Condition-Based MaintenanceCondition-based maintenance refers to a maintenance method where decisions on whether and how to perform maintenance are determined based on the real-time operating status and health condition of equipment. It has no fixed maintenance methods or schedules. The prerequisite for condition-based maintenance is the establishment of equipment parameters and the comprehensive analysis of various operational information of the equipment, so as to make reasonaNoah09/12/2025 -
Can't choose a dry-type transformer? Get expert advice – free.Traction Rectifier TransformersRated capacity: 800 to 4400 kVA; Voltage class: 10 kV and 35 kV; Rectifier pulse number: 12-pulse and 24-pulse. Compared with 12-pulse rectifier circuits, 24-pulse rectifier circuits can reduce the harmonic pollution of the power grid by 50%, and no filtering equipment is needed at this location. It is suitable for power supply systems of urban subways and rail transit.Excitation Rectifier TransformersRated capacity: 315 to 3000 × 3 kVA; Voltage class: 10 kV, 13.8Vziman09/12/2025 -
SG10 Series Transformer Overload Protection Solution | Prevent Overheating and Damage, View NowOperating Conditions in National Standard GB 6450-1986Ambient temperature: Maximum ambient temperature: +40°C Daily average maximum temperature: +30°C Annual average maximum temperature: +20°C Minimum temperature: -30°C (outdoor); -5°C (indoor) Horizontal axis: Product load; Vertical axis: Average coil temperature rise in Kelvin (note: not in Celsius).For Class H insulation products, the long-term temperature resistance of insulation materials is stipulated by the state as 180°C. However, the inRockwell09/12/2025 -
High harmonics? Your transformer may be overheating and aging fast.This report is based on the analysis of one-day power quality monitoring data of your company's distribution system. The data shows that there is significant three-phase current harmonic distortion in the system (with a high total harmonic distortion of current, THDi). In accordance with international standards (IEC/IEEE), harmonic currents at this level have posed substantial risks to the safe, reliable, and economical operation of the power supply transformer, mainly manifested in additional hLeon09/12/2025 -
Ultimate Guide to AC Contactor Abnormal Noise: From Electromagnetic Noise to Mechanical Vibration, Accurate Diagnosis and HandlingIn electrical control systems, AC contactors are among the commonly used electrical components, and they are also a common source of various electrical faults. After long-term use—especially in harsh environments with high levels of dust—AC contactors may sometimes emit squeaking or rattling noises after being pulled in and held. The causes of this phenomenon are analyzed as follows.Squeaking Noise After Pull-In and HoldingA fully functional AC contactor makes no noise when energized and pulledFelix Spark09/11/2025
