Wuhan GDZX Power Equipment Co., Ltd

When Should You Choose a Zinc Oxide Surge Arrester Tester? – Frequently Asked Questions

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.

Why Choose a Portable Transformer Oil Chromatograph?

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.

Why Do We Conduct Power Frequency Withstand Voltage Tests?

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.

ZXVLF Series Very Low Frequency (VLF) AC Hipot Tester

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.

What is Contact Resistance?

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?

What is a Circuit Breaker Tester and Why It Matters for Power System Safety

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.

What is a Relay Protection Tester?

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.

GDZX-September Procurement Festival · Limited-Time Promotion！！！

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