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China Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
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Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. Has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical measurement instrument, the product line covers a wide range of devices for testing various electrical area, such as underground cable fault locating system, power transformer test, AC/DC Hipot test, Insulation resistance test and so on. With rich measurement experiences of innovation combining and advanced technology to provide the most reliable electrical measurement. The design development production and Inspection is performed at the ISO 9001 and CE which gurantee a consistency of high quality products. XZH TEST masters a variety of technologies as well as extended service and support to deliver the highest value to our customers. We sincerely hold the tenet of "quality first, customers supreme, honor commitment trust worthy".Stays commitment R&D about electric power detection equipment and electric power automation, since its foundation, the company keeps living up to the belief of: "Create high-quality brand, casting first-class enterprise image". Also, we make the "steady development, the best quality "as the core concept of the enterprise. Our goal is to provide our customers with reliable test and measurement equipment that more safe and easy to use, we make measurement easier! Xi'an Xu & Hui Electromechanical Technology Co., Ltd expect to strengthen the relationship with world-wide cooperators, and warm-heartedly welcoming business partners to visit our factory for developing the OEM & ODM win-win Cooperation. Our Team Factory scene We have the ability to innovate new products and technologies. We can provide complete system solutions for your project. We provide online and offline practical and theoretical training. We provide instrument repair and calibration. Certification
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A 26-kilometer cable with the fault point precisely located at 3100 meters 2025-12-25 In the vast wind farm of Inner Mongolia, a 26-kilometer-long high-voltage cable had malfunctioned. Previously, a team had attempted to locate the fault by excavating at a point 3 kilometers away, based on their experience, but found nothing. Where exactly was the fault located? Was it necessary to blindly excavate for tens of kilometers? When the Xi'an Xuzhihui technical team arrived on site, they faced not only a technical challenge but also a test of trust regarding the importance of "precision." Insulation test: Using the XHMR-5000V insulation resistance tester, an insulation test was performed on phase B relative to ground. At 5000V, the resistance was 0.09 MΩ (at 500V), while all other measurements were above GΩ. The conclusion is that phase B has a high-resistance leakage fault to ground. Total length verification: First, using the XHGG502 cable fault tester, the total length of the cable was measured to be approximately 26008.7 meters using the low-voltage pulse method, which is consistent with the documented length of 26 kilometers, establishing an accurate baseline for subsequent distance measurements. Withstanding voltage test: Based on our experience, we suspected there might be underlying hidden defects. We then used the XHYB-5/50 test transformer and XHCC-6/40 pulse energy storage capacitor to conduct a DC withstand voltage test. When the voltage rose to 26kV, the fault point in phase B was punctured. Using the high-voltage flashover method of the XHGG502 cable fault tester, at the moment the voltage was applied to 33kV and the fault point discharged, the instrument successfully captured the discharge waveform, and the approximate distance to the fault point was measured to be around 3101.3 meters. We took the XHDD503C cable fault locator to a location near 3101.3 meters, but could not hear the discharge sound at the fault point. We then connected two 40/6 capacitors in parallel and increased the voltage to approximately 30kV.  We were then able to hear the discharge sound. After excavation, the fault point was confirmed to be at 3100 meters. The function of the capacitor: In high-voltage flashover testing, the pulse capacitor is an energy storage element. It stores electrical energy and then releases it at the moment of breakdown at the fault point, generating a powerful impulse discharge current. The principle of parallel connection: When capacitors are connected in parallel, the total capacitance increases (C_total = C1 + C2), but the working voltage remains unchanged. This results in a significant increase in the total stored energy (E = 1/2 * C * U²). At the same voltage, a larger capacitance can store and release more electrical energy. During discharge, the instantaneous impulse current is larger, and the arc generated at the fault point is more intense and expands more rapidly, thus exciting stronger mechanical vibrations and sound waves.
Science Popularization Mini-Lesson: Measurement using a Smart Digital Resistance Meter 2025-12-23 Intelligent Digital Resistance MeterMeasuring the DC resistance of conductors using the bridge method is cumbersome and inefficient.  However, using a DMM (digital multimeter) or an intelligent digital resistance meter to measure DC resistance is fast, has a wide measurement range, and is easy to operate, making it widely used. The measurement range is 10⁻⁷ to 10⁶ Ω, with accuracy levels of 0.25, 0.05, and 0.02. The diagram shows the principle block diagram of a smart digital resistance measuring instrument. The figure shows the measurement principle circuit of one type of instrument, also known as the voltage drop method.  Because the resistance being measured is small, the influence of lead and contact resistance must be considered. Therefore, this instrument uses a four-wire measurement method. In the diagram, P1 and P2 are the voltage terminals, and C1 and C2 are the current terminals. To improve the instrument's resolution and increase its measurement range, an adjustable constant current source is typically used.  For small resistances, the current I is increased as much as possible, and a 16-bit or 24-bit high-precision A/D converter is employed. Considering the instability of the constant current source, the circuit samples and analyzes the input current and voltage signals almost simultaneously using the A/D converter. The entire instrument operates under the control of a CPU, and the resistance value is finally displayed in digital form. The figure shows the external appearance of several intelligent digital resistance measuring instruments. Testing Precautions: When using the four-terminal method for measurement, be sure to follow the wiring method shown in the diagram (internal measurement method): the two voltage terminals should be on the inside, and the two current terminals on the outside.  The other end of the cable, connecting to the three phases and ground, must be reliably connected using thick, short copper wires.
Science Education Mini-Lesson: The Bridge Method (for measuring electrical resistance) 2025-12-23 Single-arm bridge: The principle is shown in the figure. In the figure, R1 and R2 are standard resistors, and R3 is a variable resistor. Adjust R3 to balance the bridge, so that the current flowing through the galvanometer IG = 0, i.e., UA = UB. At this time, I2 = I3, IX = I1, I3R3 = IXRX, and I2R2 = I1R1.  Therefore, RX = R1/R2 * R3. In practice, due to the resistance of the connecting wires to RX, the single-arm bridge cannot be used for measuring small resistances.  Furthermore, the regulations stipulate that the connecting wire resistance should not exceed 0.2% of the measured resistance value; if it exceeds this value, correction is required. There are many models of single-arm bridges, such as QJ-23, QJ-24, QJ-49, QJ-57, and QJ-67, with a measurement range of 1-108Ω and accuracies of 0.2, 0.1, and 0.05/0.01 levels. The figure shows the appearance of several DC single-arm bridges. Double-Arm Bridge: Single-arm bridges are only suitable for measuring DC resistances greater than 1Ω. For measuring DC resistances less than 1Ω, a double-arm bridge can be used, the principle of which is shown in the figure. In the figure, the measured resistance RX and the standard resistance RN are connected using a four-terminal connection. C1, C2, C3, and C4 are current terminals, and P1, P2, P3, and P4 are voltage terminals. When the bridge is balanced, IG=0, I1=I2, I3=I4, I1R=IRX+I3R’, I2R1=IRN+I4R2, R=R’, R1=R2, RX=R/R1*RN.  There are many models of double-arm bridges, such as QJ-42, QJ-44, QJ-19, and QJ-65, with a measurement range of 10⁻⁶ to 11Ω and accuracies of 0.2, 0.05, and 0.02 grades.  Single and Double Arm Bridges These bridges combine the functions of both single-arm and double-arm bridges, offering a wide measurement range, typically between 10⁻⁶ and 10⁷ Ω.  Examples include the QJ-31, QJ32, QJ36, and QJ47 models, with accuracies of 0.1, 0.05, and 0.02 levels, as shown in the figures below, which illustrate the external appearance of several types of DC single and double arm bridges.
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