Wuhan GDZX Power Equipment Co., Ltd

ZXCJV-800kV/40kJ Fully Automatic Impulse Voltage Generator: Ideal for High-Performance Lightning Impulse Testing

.gtr-container-k9m2x1 { font-family: Verdana, Helvetica, "Times New Roman", Arial, sans-serif; color: #333; line-height: 1.6; padding: 15px; max-width: 100%; box-sizing: border-box; } .gtr-container-k9m2x1 p { margin-bottom: 1em; text-align: left !important; font-size: 14px; word-break: normal; overflow-wrap: normal; } .gtr-container-k9m2x1__section { margin-bottom: 25px; } .gtr-container-k9m2x1__section-title { font-size: 18px; font-weight: bold; margin-bottom: 15px; color: #0056b3; text-align: left; } .gtr-container-k9m2x1 ul { list-style: none !important; padding-left: 0 !important; margin-top: 10px; margin-bottom: 1em; } .gtr-container-k9m2x1 ul li { list-style: none !important; position: relative !important; padding-left: 20px !important; margin-bottom: 8px !important; font-size: 14px; text-align: left !important; } .gtr-container-k9m2x1 ul li::before { content: "•" !important; position: absolute !important; left: 0 !important; color: #0056b3 !important; font-size: 1.2em !important; line-height: 1 !important; } @media (min-width: 768px) { .gtr-container-k9m2x1 { padding: 30px; max-width: 960px; margin: 0 auto; } .gtr-container-k9m2x1__section-title { margin-bottom: 20px; } .gtr-container-k9m2x1 p { margin-bottom: 1.2em; } .gtr-container-k9m2x1 ul { padding-left: 0 !important; } .gtr-container-k9m2x1 ul li { padding-left: 25px !important; } } Product Overview The ZXCJV-800kV/40kJ Fully Automatic Impulse Voltage Generator is a complete system designed specifically for full-wave lightning impulse voltage testing of high-voltage electrical equipment (such as ring main units, circuit breakers, load switches, composite insulators, etc.) at 110kV and below. The device has a rated voltage of 800kV and a nominal energy of 40kJ, meeting the requirements for impulse testing in national and industry standards such as GB/T 16927.1. Main Circuit and Structural Design The generator body adopts the SGS series main circuit design from HAEFELY GmbH, Switzerland, achieving a highly compact structure. The system has 8 stages, each with a voltage of 100kV and a capacity of 5kJ. Each stage uses a 1.0μF/100kV dry-type fully insulated solid dielectric capacitor, characterized by low inductance, light weight, and no risk of oil leakage. Under normal operating conditions, the casing deformation is less than 1mm. Triggering and Waveform Adjustment System A ball-triggered mechanism is used to achieve non-polarity triggering, with a trigger range greater than 20%, fast and accurate positioning, and minimal wear. The wavefront and wave-tail resistors utilize a non-inductive wound plate structure with constantan wire, externally vacuum-cast with insulating resin. The connectors are 3mm stainless steel spring-pressed, ensuring reliable contact and a smooth output waveform. The system is equipped with three sets of tuning resistors and one set of charging and protection resistors, possessing sufficient heat capacity to support long-term continuous operation. Control and Measurement System The core control system employs the ZX-CS-2020 fully automatic control system, based on a programmable logic controller (PLC). Control signals and status feedback are transmitted via two-core fiber optic cables, effectively isolating electromagnetic interference. The system supports manual, automatic, and programmable control, and features thyristor voltage regulation, constant current charging (voltage stability 0.5%), automatic ball gap adjustment, LCD display of charging voltage (accuracy 1%), and fault protection functions. The measurement system employs the DIMS-6000 digital impact measurement system, equipped with a high-speed digital acquisition card (sampling rate 1.0GS/s, bandwidth 100MHz, 8-bit resolution, 2 channels, 10K record length per channel), and a ZXCR-800kV/800pF weakly damped capacitive voltage divider (partial response time

How the GDZX High Current Generator Reshapes Electrical Testing Standards

.gtr-container-7f3d9e { font-family: Verdana, Helvetica, "Times New Roman", Arial, sans-serif; color: #333; line-height: 1.6; padding: 15px; max-width: 100%; box-sizing: border-box; } .gtr-container-7f3d9e p { font-size: 14px; margin-bottom: 1em; text-align: left !important; } .gtr-container-7f3d9e .gtr-breakthrough-item { margin-bottom: 20px; padding: 15px; border: 1px solid #e0e0e0; border-radius: 5px; box-shadow: 0 2px 5px rgba(0,0,0,0.05); } .gtr-container-7f3d9e .gtr-breakthrough-item-title { font-size: 16px; font-weight: bold; color: #0056b3; margin-bottom: 10px; text-align: left; } @media (min-width: 768px) { .gtr-container-7f3d9e { padding: 25px; max-width: 960px; margin: 0 auto; } } In electrical testing sites across industries such as power, petrochemicals, and railways, engineers have long faced several core pain points: traditional high current generators are bulky and difficult to transport; output accuracy is unstable, affecting the reliability of test results; operation is complex, wiring is time-consuming, and on-site efficiency is low; safety hazards exist, and insufficient overcurrent protection easily damages equipment. These problems not only slow down project progress but also pose potential threats to personnel and equipment safety. Facing these challenges head-on, the DDC-5K01 high current generator achieves four breakthroughs through technological innovation: Breakthrough 1: Lightweight Design Overcomes the Inherent Contradiction Between Power and Size By adopting a low-power, high-capacity autotransformer and a high-permeability iron core, the DDC-5K01 maintains a 5KVA high-power output while its size is only 30%-70% of traditional equipment, solving the core pain points of on-site transport and space occupation. Breakthrough 2: Precise Output Reconstructs Test Reliability Standards The equipment outputs a standard sine wave with a ripple factor below 0.3%, measurement accuracy up to 0.5 class, and current stability of 0.2%, providing reliable data support for critical applications such as transformer ratio testing and busbar protection verification. Breakthrough 3: Intelligent Operation Reshapes Field Work Efficiency True RMS display, automatic contact identification, and flexible switching between series and parallel connections simplify complex testing processes into intuitive operations. It supports series verification of multiple transformers, reducing batch testing time by more than 50%. Breakthrough 4: Comprehensive Safety Assurance System Dual overcurrent and overvoltage protection mechanisms, along with stringent grounding requirements, construct a complete safety protection system, ensuring the safety of equipment and personnel under harsh conditions such as long-term temperature rise tests and impact tests. The DDC-5K01 not only solves the current pain points of electrical testing but also redefines the new standards for efficient and safe testing. In today's increasingly sophisticated testing of power equipment, this solution, which combines "precision, efficiency, safety, and portability," is driving the entire industry toward a smarter and more reliable future.

How to Select the Best Configuration for Power Cable Main Insulation Fault Testing？

To ensure the safe and reliable operation of power systems, it is crucial to locate power cable main insulation faults quickly and accurately. For 35kV, 10kV, and 380V power cable systems with main insulation faults, short circuits, open circuits, grounding, or high-resistance faults, the following testing configurations and methods are recommended. I. Application Scope Applicable to main insulation faults, short circuits, open circuits, grounding, and high-resistance faults in 35kV, 10kV, and 380V power cable systems. II. Testing Objective To rapidly and precisely locate the exact position of the fault point for excavation, repair, and power restoration. For more complex cable faults, the following testing methods are recommended: High-Resistance Fault Elimination Method:Use a high-voltage breakdown source to fully puncture the fault point, then use a fault locator to measure the distance to the fault. Finally, use a pinpoint locator for precise fault location. Conduit Fault Elimination Method:When the cable runs through PE or PVC conduits, sound synchronization and echo within the conduit make it difficult to locate the fault by listening to discharge sounds. The synchronized acoustic–magnetic method combined with noise reduction effectively eliminates this issue. Since magnetic signals are interference-free, they allow for precise pinpointing. Water-Ingress Fault Elimination Method:When a cable fault occurs underwater, the discharge sound becomes muffled, and direct contact with the water surface is restricted, making pinpointing difficult. The synchronized acoustic–magnetic method combined with the step voltage method can effectively resolve this. Magnetic signals remain unaffected, and the step voltage method enables water surface contact for accurate location. III. Testing Solutions Step Test Step  General Solution Function Completion Step 1 Fault Type Identification    Megohmmeter/Multimeter Measurement  Determine the faulty phase and fault type of the cable, prepare for testing Step 2 Fault Distance Measurement Traveling Wave Range Finder (currently in general use), High-Voltage Bridge Measure the distance to the fault point to provide a general range for precise location Step 3 Cable Path Detection Smart Underground Utility Locator Detect the precise path of cables Step 4 Precise Fault Location Acoustic Testing Method, Acoustic-Magnetic Synchronization Method, Step Voltage Method Ultimately pinpointing the exact location of the fault point IV. Recommended Product Configuration for GDZX ZX-A Series Power Cable Fault Testing No. Product Name   Instrument Function 1 ZX-32B Series High-Voltage Signal Generator (Required) Generates high-voltage breakdown fault points (true integration: capacitor and discharge ball gap built-in)(Provides high-voltage signal source for pulse current distance measurement, pulse distance measurement, and precise fault location) 2 ZX-Z10 Cable Fault Locator (Required) Fault Distance Measurement (Automatic distance measurement without manual waveform analysis, foolproof)Automatic Fault Distance Analysis System V3.01, Low-voltage pulse, Pulse current, Remote service (optional features) 3 ZX-A301 Cable Fault Locator (Required) Pinpoint the exact location of the fault point(Waveform display method, intelligent method directly provides acoustic-magnetic delay values, strong noise reduction, adaptive noise reduction, no noise reduction, path compass display, automatic mute) Industry first 4 ZXPD-3000 Cable Path and Identification Instrument (Required) Path detection, screen display of cable location and depth, cable identification, real-time depth measurement, intelligent obstacle avoidance, pipeline survey Scope of Application  Detects various faults in the main insulation of sheathed cables rated at 35kV, 10kV, 380V, etc., including low resistance, high resistance, flashover, open circuits, and ground faults. All the above testing instruments are available with corresponding models on our official website.Contact us today for personalized recommendations and the optimal configuration to meet your testing needs.

Chilean Client Visits GDZX to Deepen High-Voltage Testing Technology Collaboration

On October 9, GDZX welcomed a visiting delegation from Chile. The clients made a special trip to conduct an on-site inspection, focusing on in-depth discussions around high-voltage cable testing equipment and technological collaboration, and have tentatively reached a preliminary cooperation agreement. 01 Conference Exchange Upon the clients’ arrival, GDZX held a brief welcoming meeting. Our representatives extended a warm welcome and introduced GDZX’s development journey and core products through a company video. The clients also shared an overview of their business, highlighting project requirements and technical challenges in 35kV and future 220kV cable testing.     02 Laboratory and production workshop tour Accompanied by our technical team, the clients toured GDZX’s core laboratories and production workshops, gaining a firsthand understanding of the key stages from R&D validation to mass production and delivery. While observing equipment parameter fluctuations on real-time data screens, the clients showed strong interest in the long-term operational stability and data acquisition accuracy of the equipment. During the production workshop visit, the clients focused on the precision machining of core components, the multi-dimensional quality control processes during assembly, and the comprehensive pre-delivery testing standards. They praised the automated inspection equipment and full-process traceability management system, noting that a standardized production system is key to ensuring equipment performance.     03  Showroom Experience Next, the clients moved to the product exhibition hall to gain a comprehensive understanding of GDZX’s offerings: the ZXVLF-80kVB ultra-low frequency high-voltage generator for 35kV cable withstand testing, the ZXJF-2011 digital partial discharge testing system with high-sensitivity detection, the ZXVLF-YJS3 ultra-low frequency dielectric loss high-voltage generator for insulation diagnostics, and the ZXBXZ series series-resonant devices providing solutions for 220kV cable testing. Our specialists provided detailed explanations through physical displays and demonstrations of the operation interfaces, highlighting each device’s innovative design, functional features, and on-site application cases. The clients showed keen interest, frequently stopping to inquire in depth about equipment compatibility and upgrade potential.     04  Workshop Tour Finally, the clients visited the workshop to observe the full production process, from component inspection and module assembly to complete system commissioning. Witnessing that each device undergoes rigorous aging tests and performance calibration before leaving the factory, they expressed appreciation for GDZX’s quality control system, particularly praising the modular design of the series-resonant devices and the craftsmanship of the ultra-low frequency series.            05  Strategic Win-Win Through the on-site visits and technical exchanges, the clients highly praised GDZX’s equipment for its operational stability, advanced technology, and ease of use. They engaged in productive discussions on future collaboration regarding equipment procurement and technical support in the field of high-voltage cable testing. This visit not only deepened the Chilean clients’ recognition of GDZX’s products and technical capabilities but also laid a solid foundation for future cooperation. GDZX will continue to support global power clients in meeting testing challenges with reliable products and professional services, jointly creating a dependable power future.    

How to Choose Insulating Oil Testers? A Complete Guide to Dielectric Strength vs. Dielectric Loss & Resistivity

Both types of equipment are used for testing the electrical properties of insulating oil, but their test parameters and applications differ. Below is a separate explanation: 1.Insulating Oil Dielectric Strength Tester Main Test Items: Breakdown voltage of insulating oil (dielectric strength). Measures the voltage at which the oil sample is electrically punctured by gradually increasing the applied voltage. Purpose: Evaluates the oil’s ability to withstand electric fields. Determines whether the oil contains moisture, impurities, bubbles, or other factors affecting insulation performance. This is the most basic and commonly used test for insulating oil in power systems. Applicable Scenarios: Routine maintenance of oil-immersed equipment such as transformers, reactors, and capacitors. Periodic preventive testing. 2.Insulating Oil Dielectric Loss & Volume Resistivity Tester Main Test Items: Dielectric loss factor (tgδ): Indicates the dielectric energy loss in the oil. Volume resistivity: Reflects the oil’s resistance to leakage current. Purpose: Provides a more detailed assessment of oil aging, moisture content, and dissolved impurities. Can detect potential problems that may not be revealed by dielectric strength testing alone. Offers an in-depth evaluation of both oil quality and equipment insulation condition. Applicable Scenarios: Situations with high requirements for equipment safety and reliability. Acceptance testing of new oil or post-maintenance evaluation of critical equipment. Further diagnosis of abnormal oil samples. How to Choose? Basic Monitoring: If only routine, periodic testing is needed → Dielectric Strength Tester is sufficient. In-depth Diagnosis: If a comprehensive assessment of oil condition (aging, moisture, impurities) is required → Dielectric Loss & Volume Resistivity Tester is recommended. Comprehensive Application: Many power companies use both devices together, first screening with the dielectric strength tester, then confirming with the dielectric loss/resistivity tester. Combined use can build a complete insulating oil testing system, from basic to advanced, providing the most reliable protection for the safe operation of power equipment.

How to Distinguish and Select: Ground Resistance, Loop Resistance, and Insulation Resistance Testers?

This is a common question in electrical testing.Although the names of these three instruments sound similar, their purposes, test objects, and methods are completely different: 1.Ground Resistance Tester What it measures: The resistance between a grounding device and the earth. Ensures that lightning current or fault current can be safely discharged into the ground. Applications: Substation grounding grids Power equipment grounding systems Lightning rod grounding Building grounding systems 2.Loop Resistance Tester What it measures: The contact resistance of high-current circuits, such as switchgear, cable joints, and busbar connections (typically in the micro-ohm range). Focuses on whether the contact points may overheat, ensuring reliable current transmission. Applications: Contact resistance of high-voltage circuit breakers Busbar and cable joint testing Electrical performance testing during factory inspection or maintenance of HV switchgear 3.Insulation Resistance Tester (commonly called “Vibrometer”) What it measures: The insulation resistance between electrical equipment and ground or between phases. Evaluates the insulation condition to prevent leakage current or breakdown. Applications: Insulation testing of motors, transformers, and power cables Control panels and wiring inspection Household appliances insulation check Key Differences Tester Test Object Test Purpose Resistance Range Test Voltage/Current Ground Resistance Tester Grounding system – Earth Check grounding reliability Ohms to tens of ohms Low-frequency current, auxiliary electrode method Loop Resistance Tester Contacts, circuit connections Check contact quality Micro-ohm level High current (tens to thousands of amperes) Insulation Resistance Tester Insulating materials Check insulation quality Mega-ohms to giga-ohms High DC voltage (commonly 500V – 5kV) In simple terms: Ground resistance: checks “how well you are connected to earth” Loop resistance: checks “how good the circuit contact is” Insulation resistance: checks “whether the insulation is reliable”

How to Choose an SF6 Density Relay Tester? Six Key Factors Buyers Should Know

【News】How to Choose the Right SF6 Density Relay Tester? In power systems, the SF6 density relay plays a vital role in ensuring the safe operation of SF6 electrical equipment such as GIS switchgear and circuit breakers. Since it operates infrequently during service, it may suffer from issues like sluggish action, poor contact, or degraded temperature compensation over time. Therefore, regular verification with an SF6 Density Relay Tester is essential to ensure reliable performance. For buyers, facing various models and brands on the market often raises the question: How should I choose the right tester? The following points may serve as a practical guide. 1. Accuracy and Compliance with Standards Accuracy is the top priority when selecting a tester. Choose products that comply with IEC and national power industry standards. Higher accuracy ensures more reliable assessment of relay performance. Check if the device is supplied with a calibration certificate from the manufacturer or a third-party authority. 2. Applicability and Compatibility Since SF6 density relays vary across manufacturers: Confirm whether the tester supports pressure-gauge type, contact-type, and other relay models. Ensure it is suitable for both laboratory calibration and on-site testing. Verify that the interfaces and accessories are universal and easy to connect. 3. Ease of Operation For field engineers, user experience directly affects efficiency: Does the tester support automatic testing / one-key start? Is it equipped with a touch screen and bilingual (Chinese/English) menu for easier use? Can it store test data, export via USB, or print directly, making reporting more convenient? 4. Portability and Structural Design Field testing requires instruments to be durable and portable: Choose models that are lightweight yet robust. Ensure the housing has shockproof, moisture-proof, and dust-proof protection. Check if it comes with a built-in air pump or external gas source option, offering more flexibility. 5. Safety and Environmental Protection With stricter safety and environmental standards, these functions are crucial: The tester should provide overpressure and leakage protection to ensure operator safety. It should include SF6 gas recovery capability to prevent emissions and meet environmental regulations. 6. After-Sales Service and Maintenance A reliable tester is backed by dependable service: Does the supplier provide periodic calibration, technical training, and operational guidance? Is there prompt and professional after-sales support? Are spare parts readily available to ensure long-term use? Conclusion For buyers, choosing an SF6 Density Relay Tester is not just about comparing prices. A wise decision should consider accuracy, compatibility, ease of operation, portability, safety, environmental performance, and after-sales service. Only then can the equipment truly safeguard SF6 electrical devices, reduce maintenance risks, and deliver long-term value.

What’s the Difference Between an Arrester Discharge Counter Tester and a Zinc Oxide Arrester Tester? How to Choose？

In power systems, surge arresters protect transformers, switchgear, and other equipment from lightning and switching overvoltages. To ensure their reliable performance, professional testing instruments are often required. Two commonly used devices are the Arrester Discharge Counter Tester and the Zinc Oxide Arrester Tester. Although both are used in arrester inspections, they differ significantly in function and application. 1. Differences in Function and Test Items Instrument Main Test Items Key Features Arrester Discharge Counter Tester Checks the working status and discharge count of an arrester’s online monitoring device (discharge counter); verifies the connection between the counter and the arrester Compact, lightweight, and easy to operate; mainly used to confirm whether the counter is sensitive and records accurately Zinc Oxide Arrester Tester Measures key parameters of a zinc oxide arrester, such as reference voltage, leakage current, and V–I characteristics Provides a comprehensive assessment of the arrester’s insulation and aging status, serving as an important tool for evaluating arrester health 2. Application Scenarios Arrester Discharge Counter TesterSuitable for routine inspections, quick on-site checks, or acceptance testing of new installations, ensuring the counter is correctly installed and functions reliably. Zinc Oxide Arrester TesterPrimarily used for maintenance and troubleshooting. During annual preventive tests or fault diagnosis, it measures leakage current and other indicators to assess whether the arrester has issues such as moisture ingress, aging, or breakdown. 3. How to Choose Need to quickly verify a discharge counter → Choose the Arrester Discharge Counter Tester for its portability and simple operation. Need a full assessment of arrester performance → Choose the Zinc Oxide Arrester Tester, which provides complete electrical characteristic data, ideal for maintenance teams or laboratories. For large substations or professional service units, it’s recommended to use both: start with the counter tester for routine patrols, then use the zinc oxide tester for in-depth evaluation, creating a complete maintenance system. ConclusionThe Arrester Discharge Counter Tester and Zinc Oxide Arrester Tester are not substitutes but complementary tools for different testing objectives. When purchasing, users should consider their actual testing needs, maintenance schedule, and budget to select the right device—or a combination of both—to better ensure the safe and stable operation of power systems.