What part of the circuit do I need to test? / What is the proper test voltage?
The U.S. Department of Housing and Urban Development, Manufactured Housing and Standards Division issued a memorandum in June of to All Primary Inspection Agencies and All State Administrative Agencies regarding dielectric strength testing of modular and manufactured homes as specified in standard # 24 CRF .810(a).
The memorandum states the requirements of the Dielectric Withstand test:
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"The wiring of each manufactured home is to be subjected to a dielectric strength test between live parts and the manufactured home's ground and between neutral and the manufactured home's ground. The test is either to be performed between 900 to volts for one minute or between to volts for one second. The test is conducted on each manufactured home to stress the insulation to determine if it is capable of resisting transient power line surges to which the wiring may become subjected, identify any low resistance areas of the insulating material and any dielectric breakdown paths of failures that may exist."
Please note that the test is not to be conducted from phase to phase, or between the hot and neutral conductors as this could result in damaging appliances that may be connected. The standard does not specify whether AC or DC should be used to perform the test, but the voltage ranges indicated in the standards have historically been accepted as AC values.
AC voltages are normally specified as root-mean-square (RMS) values. The RMS voltage is the effective value of a varying or alternating voltage; this value will produce the same power loss as a continuous voltage when applied to a pure resistive load. The peak value of a sine wave is actually 1.414 times greater than the RMS voltage (Figure 1). To perform an equivalent DC test, the test potential would be 1.414 times the RMS value to achieve the equivalent peak voltage. Using the RMS values specified in 24 CRF .810(a) the DC equivalents would be to volts for a one-minute test or to volts for a one second test.
Hengfeng DC hipot tester is also called dc dielectric test sets, it provide the most dependable, portable DC high voltage sources for checking the quality of electrical power cables, motors, switchgear, insulators, transformers and capacitors,which is suitable for electric power branch, power department of factories, scientific research units, railway, chemical industry, and power plants.
Product Description
Hengfeng DC hipot tester is also called dc dielectric test sets, it provide the most dependable, portable DC high voltage sources for checking the quality of electrical power cables, motors, switchgear, insulators, transformers and capacitors.
DC dielectric testing is performed by applying controlled high voltages to the unit under test at or above insulation system operating level. Measuring the leakage current helps determine the unit under test's ability to withstand overvoltages such as lightning strikes and switching surges.
DC hipot test kit is suitable for electric power branch, power department of factories, scientific research units, railway, chemical industry, and power plants.
DC Hipot Test Kit Features
1. Large color touch screen with stylus pen
2. Real-time display voltage, current, test progress, and discharge process
3. Full range smooth voltage regulation
4. Automatic raise voltage/hold voltage/drop voltage/discharge
5. Automatic MOA test function
6. Over-voltage and over-current protection
7. Automatic memory with time/date
8. Built-in thermal printer
9. USB port
10. Powerful PC software
Technical specification
30KV-400KV/2-10mA can be customized
Specifications
60KV/2/3/5/10mA
80KV/2/3/5/10mA
100KV/2/3/5/10mA
120KV/2/3/5/10mA
200KV/2/3/5/10mA
250KV/2/3/5/10mA
300KV/2/3/5/10mA
400KV/2/3/5/10mA
Voltage measurement accuracy
±'1.0 %rdg±0.1KV'
Current measurement accuracy
±'1.0 %rdg±2uA'
Power supply
220VAC±50HZ
Voltage stability
Random flunctuation, grid change is 10%, the flunctuation '1%
Working mode
Intermittent work
Maximum continuous time is 30 minutes
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Working environment
Temperature: -10'40'
Relative humidity' 85% no condensation
Altitude: below m
Storage environment
Temperature: -20'70'
Relative humidity' 85% no condensation
Altitude: below m
High voltage DC tester Included accessories
Digital high voltage microammeter
1
Power cord
1
IF output cable
1
Ground lead
1
High voltage discharge and grounding discharge rod
1
Ground lead for discharge rod
1
Current limiting resistor
1
Microammeter cable
1
High voltage output cable
1
DC Hipot Test Kit advantages
High Voltage Testing:
DC dielectric test equipments are designed to apply high voltages to electrical components and systems, allowing rigorous testing of insulation integrity and dielectric strength. This helps identify potential weaknesses or faults in the insulation material that could lead to electrical failures or safety hazards.
Detect insulation defects:
By subjecting electrical equipment and components to high voltage stress, DC hipot test kit can detect insulation defects such as cracks, voids, moisture ingress and contamination. This early detection can help prevent catastrophic failures, downtime and costly repairs by catching problems before they escalate.
Comprehensive testing:
The DC hipot test sets can perform comprehensive insulation testing on various electrical equipment, including cables, transformers, motors, generators, switchgear and other high-voltage equipment. This versatility makes it an important tool for electrical maintenance, quality assurance and compliance testing in various industries.
Safety guarantee:
DC withstand voltage tester provides the necessary safety verification process to ensure that electrical equipment and systems can withstand voltage stress without compromising safety. By performing routine withstand testing, organizations can reduce the risk of electric shock, fire, and other hazards caused by insulation failures.
Preventive Maintenance:
Implementing regular withstand testing as part of a preventive maintenance program can help extend the life of your electrical assets and reduce the likelihood of unplanned failure or outage. By identifying insulation weaknesses early, organizations can proactively address problems and avoid costly repairs or replacements.
As a professional dc dielectric test set supplier, Hengfeng has 18 years of experience in research, development, manufacturing, and service. We offer customized firmware and software services based on customer-provided specifications. Before leaving the factory, each instrument undergoes multiple tests and comes with a calibration certificate.