In the field of high-voltage electrical engineering, The reliability of insulators is paramount to the stability of power transmission and distribution networks. Insulators are constantly exposed to environmental stressors, particularly in coastal or industrial regions where salt, dust, and chemical deposits accumulate on their surfaces. When combined with moisture from fog, dew, or light rain, These contaminants form a conducting electrolytic layer that can lead to leakage currents, dry-band arcing, and ultimately, a catastrophic flashover.

The IEC 60507 artificial pollution test chamber is the definitive solution for simulating these harsh conditions in a controlled laboratory environment. By utilizing a specialized artificial pollution test machine, manufacturers and utilities can determine the power frequency withstand characteristics of ceramic and glass insulators designed for AC systems ranging from 1,000 V up to 110 kV. For utilities and manufacturers looking for a reliable high voltage insulator tester, IEC 60507 test chamber from Wewon Environmental Chambers Co., Ltd. offers a turnkey solution that bridges the gap between laboratory simulation and real-world performance.

Equipment Name	Artificial Pollution Test Chamber	General Spec
Equipment Model	WEW-APTC-IEC-60507-H5
Applied Standard	IEC 60507:1991 (Second Edition)
Test Methodology	Section Three: Salt Fog Method
Application Range	AC System Ceramic, Glass, and Composite Insulators (1kV to 110kV)
Rated Test Voltage	Adjustable from 10kV to 110kV (r.m.s)	Power Supply
Frequency Range	48 Hz to 62 Hz
Short-Circuit Current (Isc​)	≥6 A (Standard compliance for Ls​<16 mm/kV)
Source Impedance	Resistance/Reactance ratio (R/X) ≥0.1
Capacitive Ratio	Ic​/Isc​ ratio within the range 0.001 to 0.1
Nozzle Construction	Air nozzle ID: 1.2±0.02 mm; Solution nozzle ID: 2.0±0.02 mm	Fog System
Nozzle Finish	Square-cut and polished tip (Precision atomization)
Spray Column Layout	Dual parallel columns (3.0m ± 0.05m from insulator axis)
Nozzle Spacing	Vertical intervals of 0.6 m
Compressed Air Input	Filtered, oil-free air at 700 kPa±35 kPa
Solution Flow Rate	0.5 dm3/min±0.05 per nozzle
Salinity Selection	2.5 to 224 kg/m3 (standard steps)	Environment
Salinity Tolerance	±5% of the specified value
Solution Temp.	Controlled between 5°C and 30°C
Ambient Temp.	5°C to 40°C (Temp. difference with solution ≤15 K)
Pollution Fallout	Lateral 10-unit collection system (for fallout rate validation)	Pollution Fallout
Leakage Current	High-speed recording of peak pulse amplitude (Ih max​)
Thermal Balance	Automated pre-test thermal equilibrium check
Test Positions	Vertical, Horizontal, and Inclined (Adjustable α angle)	Test Positions
Clearance (H/V)	Minimum 0.5 m per 100 kV (Min. 1.5 m absolute)

The IEC 60507 test chamber primarily focuses on two categories of testing: the salt fog method and the solid layer method. For industrial applications focused on coastal environments, The salt fog method test system described in Section Three is the industry standard. In this method, the insulator is subjected to a defined ambient pollution created by atomizing a salt solution using a high-precision IEC 60507 salt fog spray system for AC systems. The core objective of insulator pollution testing is to verify the specified withstand salinity of an insulator at a given test voltage.

The Withstand salinity test equipment for insulators must be capable of handling a wide range of salinity values to simulate various environmental severities.	1. Key Parameters of the Salt Solution	IEC 60507 the Salt Fog Method (Section Three)：
Salinity Values: Standard values range from 2.5 kg/m³ to as high as 224 kg/m³.
Tolerance: The system must maintain a strict tolerance of ±5% of the specified salinity value.
Purity: The solution is composed of sodium chloride (NaCl) of commercial purity mixed with tap water. If the water hardness exceeds 350 g/m³ of CaCO3, deionized water is recommended to prevent limestone deposits.
Temperature Control: The salt solution temperature must be maintained between 5°C and 30°C.
	2. Fog Spray Nozzle Construction as per IEC 60507 Figure 2
The heart of any high voltage insulator tester is the spraying system. A standard artificial pollution test machine must feature nozzles that adhere strictly to the dimensions specified in Fog spray nozzle construction as per IEC 60507 Figure 2.
Material: Nozzles must be constructed from corrosion-resistant tubes to withstand constant exposure to salt solution.
Air Nozzle Precision: The internal diameter of the air nozzle must be 1.2 mm ± 0.02 mm.
Solution Nozzle Precision: The internal diameter of the solution nozzle must be 2.0 mm ± 0.02 mm.
Mechanical Alignment: The end of the solution nozzle must lie on the axis of the air nozzle within a tolerance of ±0.05 mm.
Surface Finish: The ends of the nozzles must be square-cut and polished to ensure a uniform spray pattern. This level of precision ensures that the atomization process is consistent across all tests,
	3. Testing Layout for Inclined Insulators as per IEC 60507 Figure 3
Not all insulators are installed vertically in the field. Substations and traction lines often utilize insulators in horizontal or inclined positions. Therefore, a professional IEC 60507 test chamber must support the testing layout for inclined insulators as per IEC 60507 Figure 3.
Spray Columns: Nozzles are arranged in two parallel columns on opposite sides of the insulator.
Distance Requirements: The distance between the solution nozzles and the insulator axis must be maintained at 3.0 m ± 0.05 m.
Nozzle Spacing: Nozzles are spaced at 0.6 m intervals along the column.
Alignment: Each spray must point at right angles to the column axis toward its counterpart on the opposite column, within an angle of 1°.
Quantity Formula: The minimum number of nozzles per column (N) is determined by the length of the insulator (H) in meters: N = (H / 0.6) + 3.
One of the most critical technical requirements for artificial pollution tests on high-voltage insulators is the capability of the voltage source.	4. Minimum Short-Circuit Current Testing Plant for Insulators
A standard high-voltage transformer used for dry tests is often insufficient for pollution tests due to the high leakage currents involved. A compliant minimum short-circuit current testing plant for insulators must meet the following criteria:
Short-Circuit Current (Isc): The Isc must be high enough to maintain the test voltage even during intense arcing. As shown in Figure 1, for specific creepage distances (Ls) less than 16 mm/kV, the Isc must be at least 6 A.
Resistance/Reactance Ratio (R/X): Must be equal to or higher than 0.1.｜Capacitive Current Ratio (Ic/Isc: Must be within the range of 0.001 to 0.1.
If the testing plant does not meet the Isc limits shown in Figure 1, the test may still be valid if the ratio of short-circuit current to the highest leakage current pulse (Isc/Ih max) is greater than or equal to 11.
Before a formal withstand test begins, the insulator must undergo a preconditioning process for salt fog method testing. This process ensures the surface of the insulator is uniformly wetted and that any residual newness or hydrophobicity is stabilized.	5. The Preconditioning Process for Salt Fog Method Testing
5.1.  Initial Wetting: The insulator is subjected to the test voltage at the reference salinity for 20 minutes.
5.2.  Voltage Ramping: If no flashover occurs, the voltage is raised in 10% steps every 5 minutes until flashover.
5.3.  Repeated Flashovers: After the first flashover, the voltage is reapplied and raised to 90% of the initial value, then increased in 5% steps until another flashover occurs. This process is repeated until a total of eight flashovers have been recorded.
5.4.  Cleaning: After preconditioning, the fog is cleared, and the insulator is washed with tap water before the actual withstand test commences. Please pay attention to this detail.
The final stage of insulator pollution testing is the withstand test. This procedure confirms if the insulator can reliably operate at a specific salinity and voltage.	6. Withstand Test and Acceptance Criteria
Test Duration: Each individual test run lasts for 1 hour.
Standard Procedure: A series of tests are performed at the specified test voltage and salinity.
Acceptance Criterion: The insulator passes the test if no flashover occurs in three consecutive 1-hour tests.
Second Chance: If one flashover occurs, a fourth test is conducted. The insulator passes if no flashover occurs during this fourth run. Performing a second test is very important.

Prevents voltage drops and stays stable during leakage current spikes and surge activity.	Features powerful short-circuit capacity (Isc​) tailored for minimum short-circuit current testing plants.	Robust Power Source	1. High-Voltage Power Supply	System Core Components:
Ensures minimal voltage fluctuations during testing.	High-precision voltage regulation hardware integrated into the power module.	Precision Voltage Regulator
Manufactured to exact tolerances of Figure 2 for superior, uniform atomization.	Calibrated inner diameters (1.2 mm for air, 2.0 mm for solution) with “square-cut and polished” ends.	Precision Atomization Nozzles	2. Intelligent Spray System
Prevents oil contamination of the insulator surface during tests.	Each nozzle group is equipped with independent flow monitoring and air filtration devices.	Contamination Prevention
Optimizes the Section Three Salt Fog Method with integrated temperature correction for density and conductivity.	Automates the preparation and monitoring of salt solutions ranging from 2.5 to 224 kg/m3.	Automated Salinity Control	3. Pollution Measurement
Accurately verifies spray uniformity across the testing area.	Includes 10 standard collection bins (5 positioned on each side of the test zone).	Salt Spray Collection Device
Allows immediate correction for temperature effects to maintain test validity.	Advanced hardware for real-time monitoring of salt water concentration.	Conductivity Tester
Flexible configurations fully compliant with the Figure 3 layout requirements.	Supports vertical, horizontal, and inclined insulator arrangements while maintaining the required 3.0m nozzle-to-axis distance.	Versatile Test Layout	4. Walk-in Simulation Chamber
Strictly adheres to the standard’s electrical clearance and safety requirements.	Precision-engineered spatial dimensions ensuring a minimum distance of 0.5m/100kV between the insulator and the wall.	Chamber Clearance Design
Ensures long-lasting durability for the most demanding environmental testing conditions.	The interior is constructed using specialized salt spray and corrosion-resistant materials.	Anti-Corrosion Materials

While the artificial pollution test chamber effectively evaluates the electrical performance and flashover resistance of insulators under severe environmental contamination, comprehensive quality assurance requires testing their physical durability as well. In real-world overhead transmission lines, insulators must withstand extreme mechanical tension and structural stress while being simultaneously exposed to dramatic ambient temperature fluctuations. To completely evaluate the mechanical strength of your ceramic and glass insulators and ensure absolute field reliability, we highly recommend exploring our [Thermal-Mechanical Testing Machine for Insulators] as a crucial addition to your high-voltage testing laboratory.