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Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
                        시안 Xu&Hui 전자 기계 기술 회사 / 시안 XZH 전기 전력 기술 회사 2013년에 중국 시안에 위치한, 전기 측정기 개발에 전념하는제품 라인은 다양한 전기 영역을 테스트하는 다양한 장치를 포함합니다., 지하 케이블 결함 탐지 시스템, 전력 트랜스포머 테스트, AC / DC 히포트 테스트, 단열 저항 테스트 및 기타.풍부한 측정 경험과 함께 혁신을 결합하고 가장 신뢰할 수있는 전기 측정. 설계 개발 생산 및 검사ISO 9001 및 CE고품질의 제품의 일관성을 보장합니다. XZH TEST는 다양한 기술을 마스터하고 있으며 고객에게 최고의 가치를 제공하기 위해 확장된 서비스와 지원을 제공합니다. 우리는 성실히"품질은 우선이고 고객들은 최우선이며, 명예는 신뢰를 받을만한 약속"전기 전력 감지 장비 및 전기 전력 자동화에 대한 연구 개발에 헌신합니다.1등 기업 이미지 구축"또한, 우리는 "정속적인 발전, 최고의 품질"을 기업의 핵심 개념으로 만듭니다. 우리의 목표는 우리의 고객에게 신뢰할 수 있는 테스트 및 측정 장비를 제공하는 것입니다. 더 안전하고 사용하기 쉬운 측정이 더 쉬워집니다. 시안 쑤와 후이 전자 기계 기술 회사 (주) 는 전 세계 협력업체와의 관계를 강화할 것으로 기대합니다.그리고 OEM & ODM Win-Win 협력을 개발하기 위해 우리의 공장을 방문하는 데 따뜻한 비즈니스 파트너를 환영. 우리 팀 공장 장면 우리는 새로운 제품과 기술을 혁신할 수 있는 능력을 가지고 있습니다. 우리는 당신의 프로젝트에 대한 완전한 시스템 솔루션을 제공할 수 있습니다. 우리는 온라인과 오프라인에서 실용적이고 이론적인 교육을 제공합니다. 우리는 기기 수리 및 캘리브레이션을 제공합니다. 인증
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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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