Wuhan GDZX Power Equipment Co., Ltd Company News

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.

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”

【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.

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.

Zinc oxide surge arresters (MOAs) protect power equipment from lightning and switching overvoltage. Over time, their insulation and leakage current may change, so regular testing is important. Below are answers to common questions from our customers. 1. Do new arresters need testing?  Yes. Test before installation or commissioning to set baseline data. 2. How often should they be tested?  Every 1–2 years, checking leakage current, resistive current, and reference voltage. 3. When should testing be done immediately?  After: Visible damage (cracks, discharge marks) Moisture or dirt on the base or housing Lightning strikes or switching surges Leakage current alarms 4. During overhauls or maintenance?  Yes. Include surge arrester testing in scheduled inspections or repairs. Benefits of a Tester Accurate leakage current measurement (separates resistive and capacitive parts) On-line testing without disassembly Works with various voltage levels for substations and transmission lines Summary Surge arresters are the grid’s first line of defense. Routine testing with a quality instrument prevents failures and outages.Need advice on test intervals? Contact our team — we’ll create a plan based on your equipment and environment. Tip:A clear testing schedule plus reliable instruments = safe and stable power systems.

A portable transformer oil chromatograph is a high-tech instrument specifically designed for on-site gas chromatographic analysis of insulating oil in power transformers and other oil-filled electrical equipment (such as reactors, instrument transformers, and bushings).Its core purpose is to detect fault-characteristic gases dissolved in oil, diagnose potential internal faults, and serve as a key tool for condition-based maintenance (CBM) and preventive testing in the power industry. Key Concerns for Users: 1.Accuracy and Reliability of Analysis Our device adopts the classic “three-detector process,” completing full analysis of seven dissolved gases (H₂, CH₄, C₂H₄, C₂H₆, C₂H₂, CO, CO₂) in a single injection. The results are highly consistent with those from laboratory-grade chromatographs, with qualitative deviation ≤1% and quantitative deviation ≤3%, ensuring precise and trustworthy data. 2.Portability and Rapid DeploymentWith an advanced compact modular design, the instrument weighs less than 15 kg and comes with a trolley case, making it easy to carry to field sites. It provides timely, accurate data for transformer inspections while saving substantial manpower and time. 3.Intelligent and User-Friendly OperationA fully computerized touch-screen interface allows real-time monitoring of temperature and carrier-gas flow across four channels. Parameters are set with one touch, and users only need simple power-on/off operations to perform routine testing, greatly reducing the operating threshold. 4.Stability and Protection FunctionsThe system features multiple safeguards: automatic bridge-current cutoff when pressure or flow exceeds preset limits, protection of the thermal-conductivity detector in case of carrier-gas loss, and automatic shutdown with fault alerts if temperature control fails—ensuring long-term stable operation. 5.Networking and Data ManagementBuilt-in 10/100 M adaptive Ethernet enables fast remote data transmission. The dedicated chromatograph workstation for power systems supports centralized management of multiple devices, providing trend analysis, over-limit alarms, three-ratio diagnostics, and more to help O&M teams make informed decisions. Technical Advantages at a Glance: Minimum detectable concentration: H₂ 2 µL/L, CO 1 µL/L, CH₄ 5 µL/L, C₂H₄/C₂H₆/C₂H₂ 0.1 µL/L Temperature range: ambient + 4 °C to 450 °C, control accuracy ±0.05 °C Six temperature-control zones, ≥20-step programmed heating Dimensions: 450 × 430 × 230 mm; weight < 15 kg Certification and Market Recognition: This portable oil chromatograph has been tested by the Shandong Provincial Institute of Metrology, with all performance indicators reaching international advanced levels. It was awarded the Shandong Provincial Key New Product title in 2020 and received government funding for technology transformation.The instrument complies with international standards IEC 60567:2011 and IEC 60599:2015.

In the power industry, insulation performance is the key to ensuring the safe and reliable operation of electrical equipment. To verify insulation levels, the Power Frequency Withstand Voltage Test has become an essential inspection during manufacturing, installation, and operation stages. What is the Power Frequency Withstand Voltage Test? The Power Frequency Withstand Voltage Test, also known as the AC Withstand Test, applies a power-frequency voltage higher than the rated operating voltage to electrical equipment for a specified duration. Its purpose is to check whether the insulation can withstand the applied voltage without breakdown or flashover. This is one of the most fundamental and critical insulation tests. Why is the Test Necessary? 1. Verify Insulation StrengthEquipment such as cables, transformers, switchgear, and instrument transformers must operate under long-term power-frequency voltage. This test ensures their insulation strength meets requirements and can withstand real operating conditions. 2. Detect Potential DefectsInsulation may deteriorate due to factors such as moisture, aging, surface damage, or manufacturing flaws. By applying a higher voltage, this test helps uncover hidden issues early, allowing timely maintenance and repair. 3. Comply with Industry StandardsInternational and national standards (IEC, IEEE, GB, etc.) mandate power frequency withstand voltage testing as a critical step for factory inspection, acceptance testing, and preventive maintenance. 4. Ensure Grid and Personnel SafetyInsufficient insulation in service may lead to breakdown, short circuits, outages, or even personal injury. This test significantly reduces such risks, ensuring both system stability and operator safety. Conclusion The Power Frequency Withstand Voltage Test is not only a “quality checkpoint” in the manufacturing and operation of electrical equipment, but also an essential safeguard for the safe and stable operation of the power grid. By verifying insulation performance, detecting potential defects, and meeting industry standards, it plays a vital role in improving the safety and reliability of power systems. Power safety is never a small matter — it starts with reliable withstand voltage testing to safeguard every kilowatt-hour of electricity.

The ZXVLF series Very Low Frequency (VLF) high-voltage generator is a specialized device for conducting withstand voltage tests and insulation diagnostics on medium- and high-voltage power cables, rotating electrical machines (such as generators and large motors), and other capacitive electrical equipment (such as power capacitors and cable accessories). By generating a 0.1Hz ultra-low frequency sinusoidal high voltage, it provides an equivalent replacement for power frequency (50Hz/60Hz) withstand voltage testing. This eliminates the challenges associated with testing large-capacity specimens (such as long cables) at power frequencies, which typically require bulky, cumbersome equipment that is difficult to transport and handle on-site.  It is widely used for cables, generators, motors, transformers, and switchgear, fully meeting IEC, IEEE, and national power industry standards.       Key Features High Intelligence: Digital frequency conversion technology with microcomputer control enables fully automatic boosting, lowering, and measurement. Easy Operation: Simple wiring, 7-inch LCD touch screen, and user-friendly interface. Comprehensive Protection: Over-voltage and over-current protection on both HV and LV sides, fast response (≤10ms), ensuring safety. Safe & Reliable: Controller and HV generator are connected via low-voltage photoelectric isolation for maximum safety. Stable Output: Equipped with HV/LV closed-loop negative feedback circuit to eliminate capacitance rising effect. Accurate Sampling: Voltage and current data are directly sampled on the HV side for true and precise results. Well Equipped: 7-inch capacitive touch screen, LCD display, automatic storage, and printing functions. Wide Test Range: Multiple frequency options (0.1Hz, 0.05Hz, 0.02Hz) to cover different test objects. Portable: Compact and lightweight, convenient for field testing. Multi-language Display: Supports Chinese-English switch, other languages customizable.

When two conductors touch, you’d expect electricity to flow freely — but in reality, it doesn’t.On a microscopic level, metal surfaces are rough, so current only passes through a few tiny spots. This creates contact resistance. Why it matters:Too much contact resistance in switches, breakers, or busbar joints can cause: Overheating  Power losses  Damaged contacts Equipment failure What causes it? Constriction effect – Current squeezed through tiny contact spots Surface films – Oxides, moisture, or dirt blocking current Material factors – Some metals (like silver, gold) resist oxidation better than copper How do we test it? The standard way is the DC voltage drop method: Apply high current (100A–600A) Measure the tiny voltage drop Use Ohm’s law R=U/IR = U / IR=U/I to calculate resistance In short:Contact resistance may be small, but it can cause big problems. That’s why regular testing is essential to keep electrical equipment safe and reliable. Do you monitor contact resistance in your projects?

Introduction:Circuit breakers are the guardians of our power systems. When a fault occurs, such as a short circuit or overload, they act instantly to disconnect the faulty part of the circuit, preventing accidents from spreading. Ensuring that circuit breakers operate reliably is critical — and that’s where circuit breaker testers come in. What is a Circuit Breaker Tester? A Circuit Breaker Tester is a specialized electrical testing device used to detect, verify, and evaluate the performance of high- and low-voltage circuit breakers. It helps power professionals ensure that circuit breakers are ready to perform when the grid demands. Main Functions 1. Operating Time TestMeasures the closing and opening time, as well as three-phase asynchronism, to determine whether the circuit breaker operates accurately and responsively. 2. Mechanical Characteristic TestEvaluates parameters such as opening/closing speed, stroke, over-travel, and rebound amplitude to assess the mechanical performance of the breaker. 3. Dynamic Characteristic TestAnalyzes dynamic current and voltage waveforms to study the breaker’s behavior during operation. 4. Main Circuit Resistance TestMeasures the contact resistance of the breaker to assess its conductivity and contact condition. 5. Minimum Break Time and Reclosing TestChecks the breaker’s ability to open and close repeatedly within a short time, ensuring it meets the fast switching requirements of the power grid. Application Scenarios Power plants and substations Power maintenance departments High-voltage switchgear manufacturers Electrical research institutes Conclusion:In short, a circuit breaker tester is like a “doctor” for circuit breakers. By conducting a series of electrical and mechanical tests, it ensures that breakers operate safely, quickly, and reliably — keeping the power grid secure at all times.

Core Definition A Relay Protection Tester (also known as an Automated Test Set) is a specialized electronic device designed to test and verify the performance and reliability of protective relays in power systems. Functions & Capabilities Fault Simulation: Accurately generates fault signals such as overcurrent, over/under voltage, distance protection, differential protection, and frequency deviation. Logic Verification: Ensures the relay can correctly and promptly issue trip commands to circuit breakers when abnormal conditions are detected. Setting Verification: Confirms that the relay operates precisely at the configured set points (current, voltage, time) as required by the grid standards. Automated Testing: With dedicated software, the tester can automatically run complex test sequences and generate comprehensive test reports. Application Value Relay protection testers are essential for ensuring the safe and stable operation of power systems. They are widely used for: Routine maintenance and inspection of power equipment Acceptance testing of new installations before commissioning Post-fault analysis to verify relay operation and protection logic The importance of relay testing lies in the fact that, during a short circuit or ground fault, the reliability and speed of relay operation (often within milliseconds) directly determine whether: Equipment is protected from severe damage The power grid remains stable or suffers a large-scale blackout Safety incidents can be prevented Thus, relay protection testers are an indispensable tool in power plants, substations, and transmission networks. GDZX Advantages GDZX offers a wide range of relay protection testers, from standard models to advanced automated solutions, meeting diverse testing requirements across the power industry.Feel free to contact us anytime for detailed solutions and quotations.

.gtr-container-promo-xyz789 { font-family: Verdana, Helvetica, "Times New Roman", Arial, sans-serif; color: #333333; line-height: 1.6; padding: 15px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; word-break: normal; } .gtr-container-promo-xyz789__greeting { font-size: 16px; font-weight: bold; margin-top: 0; margin-bottom: 15px; text-align: left !important; } .gtr-container-promo-xyz789__section-title { font-size: 18px; font-weight: bold; margin-top: 25px; margin-bottom: 15px; text-align: left !important; } .gtr-container-promo-xyz789__policy-title { font-size: 16px; font-weight: bold; margin-top: 20px; margin-bottom: 10px; text-align: left !important; } .gtr-container-promo-xyz789__call-to-action { font-size: 14px; margin-top: 25px; margin-bottom: 0; text-align: left !important; } .gtr-container-promo-xyz789 p { font-size: 14px; margin-top: 0; margin-bottom: 10px; text-align: left !important; } .gtr-container-promo-xyz789 strong { font-weight: bold; } .gtr-container-promo-xyz789__table-wrapper { overflow-x: auto; margin-bottom: 20px; } .gtr-container-promo-xyz789 table { width: 100%; border-collapse: collapse !important; border-spacing: 0 !important; margin-bottom: 15px; min-width: 300px; } .gtr-container-promo-xyz789 th, .gtr-container-promo-xyz789 td { border: 1px solid #cccccc !important; padding: 10px 12px !important; text-align: left !important; vertical-align: top !important; font-size: 14px; word-break: normal; } .gtr-container-promo-xyz789 th { font-weight: bold; background-color: #f0f0f0; color: #333333; } .gtr-container-promo-xyz789 tr:nth-child(even) { background-color: #f9f9f9; } .gtr-container-promo-xyz789__benefits-list { list-style: none !important; margin: 0 !important; padding: 0 !important; margin-bottom: 15px; } .gtr-container-promo-xyz789__benefits-list li { position: relative; padding-left: 25px; margin-bottom: 8px; font-size: 14px; text-align: left; } .gtr-container-promo-xyz789__benefits-list li::before { content: "•"; position: absolute; left: 0; top: 0; color: #007bff; font-weight: bold; font-size: 16px; line-height: 1.6; } @media (min-width: 768px) { .gtr-container-promo-xyz789 { padding: 25px 40px; } .gtr-container-promo-xyz789__greeting { font-size: 18px; margin-bottom: 20px; } .gtr-container-promo-xyz789__section-title { font-size: 20px; margin-top: 30px; margin-bottom: 20px; } .gtr-container-promo-xyz789__policy-title { font-size: 18px; margin-top: 25px; margin-bottom: 12px; } .gtr-container-promo-xyz789 p { margin-bottom: 12px; } .gtr-container-promo-xyz789__table-wrapper { overflow-x: visible; } } Dear Valued Customers, To express our sincere gratitude for your continued support, we are pleased to announce the September Procurement Festival with exclusive benefits, designed to maximize the value of your purchases. Promotion Policies Policy 1: Tiered Cash Discounts Order Amount (USD) Discount (USD) ≥ 10,000 600 ≥ 30,000 1,500 ≥ 50,000 2,500 ≥ 100,000 4,500 ≥ 200,000 8,000 Policy 2: Flexible Discounts Discounts can be exchanged for equivalent products to meet different purchasing needs. Policy 3: Extended Warranty During the promotion period, all orders enjoy an extended warranty from 1 year to 2 years for added peace of mind. Why Choose Us? High-quality products with strict quality control Limited-time promotion with maximum annual savings Extended warranty and worry-free after-sales service Promotion period is limited: September 1 – October 31, 2025Seize this opportunity and contact our sales team to get your personalized quotation and procurement plan!