Knowledge

What international standards do Huazheng transformer oil testers comply with?

Huazheng transformer oil testing equipment is built around the test methods laboratories already cite in oil-quality specifications: IEC 60156 specifies the method for determining

Oct 16, 2026

HZ2612 Transformer LV Short Circuit Impedance Tester Routine Maintenance

Moisture-Proofing – In regions with humid climates or during humid seasons, extended periods of non-use can allow moisture to accumulate inside the instrument. To prevent thi

Oct 09, 2026

What Is a BIL Impulse Test? Lightning Impulse Explained

A BIL impulse test applies a standardized lightning impulse voltage to electrical equipment-most commonly power transformers-to verify that its insulation can withstand fast, high-

Sep 18, 2026

Karl Fischer Volumetric vs Coulometric: Which to Use?

Karl Fischer (KF) titration is the reference method for measuring water content in liquids, solids, and gases. Unlike loss-on-drying, KF is specific to water-not total volatile con

Sep 11, 2026

SF6 Gas Applications: Where Sulfur Hexafluoride Is Used and Why

Sulfur hexafluoride (SF6) is a colorless, odorless, chemically inert gas with exceptional dielectric strength and arc-quenching capability. Since the 1960s it has become the domina

Aug 28, 2026

What Is an SF6 Gas Leakage Detector and Why Every GIS Substation Needs One

SF6 - sulfur hexafluoride - is the workhorse insulating and arc-quenching gas inside modern gas-insulated switchgear (GIS), circuit breakers, and high-voltage bus ducts. It's a

Aug 25, 2026

Transformer Oil BDV Value – Assessment and Action Guide

The breakdown voltage (BDV) of transformer insulating oil is the single fastest health check a maintenance team can run - but only if the result is read correctly. Too many enginee

Aug 19, 2026

What Is the Purpose of VLF Testing?

Very Low Frequency (VLF) testing is a field-based method for assessing the integrity of medium- and high-voltage (MV/HV) power cable insulation. It applies low-frequency AC voltage

Aug 12, 2026

What Is an Isoperibol Bomb Calorimeter and How It Measures Calorific Value?

When a coal supplier quotes a heat content of 25,000 kJ/kg, or a diesel spec sheet lists a gross calorific value of 45.5 MJ/kg, or a fire safety lab certifies a building material u

Aug 06, 2026

Pour Point vs Cloud Point vs CFPP: Which Cold Flow Test Tells You What?

Every winter, the same confusion repeats: fuel buyers and lubricant specifiers mix up pour point, cloud point, and cold filter plugging point - and the wrong choice of test can mea

Aug 05, 2026

Introduction to IR, TTR, WR and BDV

1. Full Name & Function of Each Parameter IR – Insulation Resistance Insulation Resistance tests the DC insulation resistance between transformer windings to ground and b

Jul 30, 2026

ASTM D92 vs ASTM D93: Which Flash Point Test Method Should You Use?

Flash point is the lowest temperature at which a liquid gives off enough vapor to ignite momentarily when exposed to a flame. ASTM D92 and ASTM D93 are the two most referenced ASTM

Jul 27, 2026