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Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
                        A Comissão concluiu que a indústria da União não foi sujeita a medidas fiscais. Foi fundada em 2013, localizada em Xi'an, na China, que é uma equipe altamente experiente dedicada ao desenvolvimento de instrumentos de medição elétricos,A linha de produtos abrange uma ampla gama de dispositivos para testes de várias áreas elétricas, tais como sistema de localização de falhas de cabos subterrâneos, teste de transformador de potência, teste AC/DC Hipot, teste de resistência ao isolamento e assim por diante.Com experiências de medição ricas de inovação combinando e tecnologia avançada para fornecer a medição elétrica mais confiável. O desenvolvimento do projecto, a produção e a inspecção são realizados noISO 9001 e CEque garantam a consistência dos produtos de alta qualidade. A XZH TEST domina uma variedade de tecnologias, bem como um serviço e suporte estendidos para oferecer o maior valor aos nossos clientes. Defendemos sinceramente o princípio de"Qualidade em primeiro lugar, clientes supremos, compromisso de honra digno de confiança"A empresa mantém o compromisso com a I&D sobre equipamentos de detecção de energia elétrica e automação de energia elétrica, desde a sua fundação, a empresa continua a viver à altura da crença de: "Criar marca de alta qualidade,"Casting de uma imagem de empresa de primeira classe"Além disso, fazemos do "desenvolvimento estável, a melhor qualidade" o conceito central da empresa. Nosso objetivo é fornecer aos nossos clientes equipamentos de teste e medição confiáveis que sejam mais seguros e fáceis de usar, tornando a medição mais fácil! Xi'an Xu & Hui Electromechanical Technology Co., Ltd. esperam fortalecer a relação com os colaboradores em todo o mundo,e bem-vindos aos parceiros de negócios para visitar a nossa fábrica para desenvolver a cooperação OEM & ODM win-win. A nossa equipa Cena da fábrica Temos a capacidade de inovar novos produtos e tecnologias. Podemos fornecer soluções de sistema completas para o seu projeto. Fornecemos formação prática e teórica online e offline. Fornecemos reparação e calibração de instrumentos. Certificação
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Science Popularization Mini-Lesson: Parallel Equivalent Circuits 2025-12-11 The figure shows the equivalent circuit of a power cable.In the figure, L represents the equivalent inductance of the cable, with a value of 0.1-0.7 mH/km, which can generally be calculated using a formula. Power Cable Equivalent Circuit (a) Theoretical equivalent circuit; (b) Actual equivalent circuitL = 0.05 + 0.2 * ln(ks/r) Where k is a coefficient (k=1 for triangular structure, k=1.26 for parallel structure, see cable structure diagram);S is the distance between the centers of the conductors in mm;R is the radius of the conductor in mm. Cable Structure Diagrams(a) Triangular structure; (b) Parallel structureDue to the relatively small equivalent value of L, it can be considered a short circuit in practical analysis.  The figure shows the equivalent inductance values ​​of some XLPE power cables. Figure RX shows the DC resistance of the power cable core conductor, which is related to the conductor material, core cross-sectional area, and cable length, and conforms to the following relationship: where ρ is the resistivity; at an ambient temperature of 20℃, ρCU = 1.75 × 10⁻⁸ Ω·m, ρAL = 2.83 × 10⁻⁸ Ω·m, and ρsteel strip = 8.79 × 10⁻⁸ Ω·m;LC is the cable length in meters;S is the cable conductor cross-sectional area in mm².The table shows the maximum DC resistance values ​​of some XLPE power cable cores (at 20℃). In the figure, R0 and C0 are two parameters related to the cable insulation material and its structure. R0 is generally small, but much larger than RX, i.e., R’0 ≈ R0; C0 can be considered as the equivalent capacitance between the cable core and the cable metal shield, with a value of 0.1-0.7 μF/km.  It can generally be calculated using a formula. In the formula, ε is the dielectric constant of the insulating medium, such as the dielectric constant of XLPE power cables ε1=2.3, and the dielectric constant of oil-impregnated paper insulated cables ε2=3.3;d1 is the diameter of the conductor core, including the semiconductor shielding layer;d2 is the outer diameter of the insulation. The table shows the single-phase equivalent capacitance of some XLPE power cables.Series equivalent circuits are generally used when analyzing AC circuits.
Popular Science Lesson: Main Electrical Performance Tests for Power Cables 2025-12-09 Since power cables are mainly composed of two parts—metallic conductors and insulators—the electrical performance tests for power cables revolve around these two aspects. Conductor Electrical Performance and Related Tests:* These mainly involve measuring the DC resistance of the conductor, checking the cable phase, and calculating the cable's current carrying capacity. Insulation Electrical Performance and Related Tests:This is the most important and complex type of test for power cables, including two main categories: inspection tests (non-destructive tests) and withstand voltage tests (destructive tests). Inspection tests refer to indirectly judging the insulation condition by measuring certain characteristics of the cable insulation at lower voltages. There are many methods, such as insulation resistance testing and dielectric loss tangent testing. These tests reveal, to a certain extent, the different natures and developmental stages of insulation defects. Withstand voltage tests, on the other hand, simulate various voltages that may occur during operation, applying equivalent or more severe voltages to the insulation to test its withstand capability. This type of test is the most effective, feasible, and irreplaceable. However, withstand voltage tests can only reveal insulation defects when they have developed to a relatively severe level, in the form of breakdown, and cannot clearly reveal the nature and root cause of the insulation. Withstand voltage tests typically take the form of DC withstand voltage tests, AC withstand voltage tests, impulse withstand voltage tests, and partial discharge tests under high voltage.
Science Popularization Mini-Lesson: Electrical Performance Testing of Power Cables 2025-12-06 To ensure safe power supply, power cables undergo a series of electrical performance tests before leaving the factory, after installation, and during use. Based on the purpose of the test, cable tests can be divided into five categories: type tests, sample tests, routine tests, acceptance tests, and preventive tests. (1) Type Test: This is a test conducted by the manufacturer before mass production of a new type of cable. This test compares the performance and quality of the new product with existing products, or directly demonstrates that the new product meets the performance requirements for actual operation.  It is generally only performed once, unless there are changes in materials, structure, or manufacturing process. (2) Sample Test: This is a test conducted by the manufacturer on a certain proportion of cables sampled from a batch.(3) Routine Test: This is a test conducted by the manufacturer on all finished cables to check for problems in the mass production process and to ensure the quality stability of the product.(4) Acceptance Test: This refers to the test performed on cables after new installation and before commissioning, sometimes also including tests after major or minor repairs. (5) Preventive Test: This usually refers to periodic maintenance tests performed on cables during operation to promptly detect potential problems and changes in cable performance, preventing accidents or damage to the cables.
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Edifício B8-01, Fase I, Cidade Industrial Ronghao, n.o 2098, Weiyang 9th Road, distrito de Gaoling, Xi'an, China
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