- You must be logged in to create new topics.
David Allen
David Allen
Forum Replies Created
-
AuthorPosts
-
David AllenMember
Reduce core losses via better steel/amorphous alloys; reduce copper losses via larger cross-sections; optimize cooling, PF correction, and operate near design loading.
David AllenMemberInsulation PF test (tan ?) applies AC at rated voltage; dissipation factor indicates dielectric condition of windings, bushings, and oil. Field test per IEC/IEEE.
January 27, 2026 at 8:58 am in reply to: Explain how short circuit test is carried out on a power transformer? #332209David AllenMemberA short-circuit (short-circuit impedance) test energizes one winding at rated current while the opposite winding is shorted. Only copper losses dominate because voltage is low. The test yields impedance, copper losses, and thermal behavior used for protection and fault studies.
David AllenMemberPower transformers are used at key nodes of the electrical network. Typical locations include generator step up substations at power plants, high voltage transmission substations, interconnection points between different voltage tiers, large industrial plants and major distribution substations feeding cities or regions. They serve wherever significant power flows between circuits at different voltage levels. Smaller power transformers also appear inside industrial equipment, traction systems and large renewable plants, linking inverters or generators to medium and high voltage networks.
January 24, 2026 at 4:27 pm in reply to: How do you calculate transformer power from voltage and current? #331697David AllenMemberSingle-phase: kVA = V × I / 1000. Three-phase: kVA = ?3 × V × I / 1000.
January 24, 2026 at 7:11 am in reply to: Where is a residential power transformer installed in neighborhood grids? #331613David AllenMemberResidential transformers are pole-mounted or pad-mounted along streets, stepping MV (e.g., 4-15 kV) to LV (e.g., 120/240 V) for houses and small businesses.
January 23, 2026 at 10:42 pm in reply to: How does a power and distribution transformer differ in application? #331549David AllenMemberPower transformers operate at transmission voltages and high kVA ratings; distribution transformers supply end users at utilization voltages with better regulation at variable loads.
January 23, 2026 at 5:38 am in reply to: What engineering challenges arise when designing the smallest power transformer? #331399David AllenMemberMiniaturization challenges include core saturation, thermal dissipation, winding insulation thickness, parasitics, and efficiency at high frequency (for SMPS designs). Designers balance size, losses, and manufacturability.
January 22, 2026 at 7:59 am in reply to: What does a Saudi power transformer company manufacture for the grid sector? #331200David AllenMemberIt manufactures transmission and distribution transformers, reactors, and related substation components tailored for high temperature and desert operating environments.
January 22, 2026 at 5:52 am in reply to: What key degradation products are removed by the CMM-12R oil regeneration systems? #331169David AllenMemberThe system removes moisture, gases, acidic compounds, and oil decomposition products that accumulate during service, which degrade insulation performance and increase the risk of dielectric failure.
January 22, 2026 at 5:16 am in reply to: What is the primary purpose of the CMM-12R oil regeneration systems? #331161David AllenMemberThe primary purpose of the CMM-12R oil regeneration systems is to restore used transformer insulating oil to a condition close to new by removing degradation products, moisture, gases, acidic compounds, and oxidation by-products. This extends transformer service life and reduces the need for oil replacement.
January 22, 2026 at 1:06 am in reply to: In what climates and environments can the CMM-G operate? #331101David AllenMemberDesigned for harsh climates, the CMM-G supports operations in cold or hot conditions common at wind farms worldwide. Its robust components, trailer mounting, and protective enclosures ensure it maintains performance and reliability across a range of field conditions, minimizing weather-related delays.
January 21, 2026 at 5:38 pm in reply to: Why is moisture removal from transformer insulation crucial? #330989David AllenMemberMoisture in transformer insulation significantly lowers dielectric strength, leading to electrical breakdown under operating stress. Proper drying increases dielectric strength up to 20× compared to undried insulation. Removing both water and air voids restores insulation integrity, extends transformer life, and minimizes risk of insulation failure or short circuits in service.
January 21, 2026 at 3:53 pm in reply to: What industries rely on a power transformer manufacturer in Indonesia? #330963David AllenMemberIn Indonesia utilities, mining companies, oil and gas facilities, cement plants, manufacturing parks, pulp and paper mills and urban infrastructure projects rely on local or regional transformer manufacturers. These industries need distribution and power transformers for substations, internal plant networks and renewable energy projects. Local manufacturing reduces import lead time, eases service logistics and supports government policies on domestic content. Offshore installations and remote mining operations particularly benefit from responsive regional transformer support.
January 21, 2026 at 9:01 am in reply to: Where are Hyundai power transformers manufactured in Alabama? #330847David AllenMemberHyundai Power Transformers USA (Montgomery, AL) manufactures large power transformers for North American utilities, transmission operators, industrial plants, and renewable projects.
January 19, 2026 at 9:01 am in reply to: What are AC power transformers used for in residential and industrial distribution? #330314David AllenMemberAC power transformers enable voltage conversion and isolation from generation to end user. Residential systems rely on distribution transformers to supply 120/240V or 230/400V, while industrial systems may require 3-phase MV step-down for motors, drives, and process equipment.
November 8, 2025 at 8:35 am in reply to: In order to do internal calibration for TOR-3, do you use Standard Oil? If yes, where can we find this Standard Oil? #327196David AllenMemberYes, calibration of the TOR-3 device is performed using certified reference (standard) insulating oil according to IEC 60156. Equivalent calibration oil can be purchased from certified laboratory-oil suppliers; specifications are listed in the TOR-3 manual.
November 8, 2025 at 12:08 am in reply to: Inquiry Regarding Vacuum Drying System for Pad-Mounted Transformers #327164David AllenMemberGlobeCore vacuum drying systems are suitable for pad-mounted transformers. They provide uniform heating and deep dehydration under vacuum. Please provide transformer dimensions and moisture level to prepare a quotation.
November 6, 2025 at 7:12 pm in reply to: Quotation Request for Transformer Oil Testing Equipment – INDIA #327042David AllenMemberGlobeCore supplies transformer oil testing equipment such as breakdown voltage testers (TOR-100), moisture analyzers (TOR-1), and acidity testers. Please confirm the required models and quantities for an official quotation to India.
November 6, 2025 at 8:41 am in reply to: Request for Quotation – Transformer oil colour tester #326990David AllenMemberThe transformer oil color tester measures color according to ASTM D1500 or ISO 2049. We can provide a quotation, datasheet, and lead time for your order.
-
AuthorPosts