Insulation Detector

Name: Insulation Detector
Brand: DingAnda
SKU: 252544857

Insulation detector use a low-current, high-voltage DC load to measure resistance in wires and windings of motors to detect leakage currents and poor or damaged insulation that can lead to arcing, burned circuits, and risk of electric shock or fire.

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Product Introduction

What is Insulation Detector

Why Choose Us

Innovation

Seeking development through innovation, establishing a brand through responsibility, and creating a model of value for Dinganda National Enterprise; Since its establishment, the company has gathered industry elites and continuously pursued the expansion of production scale, rationalization of product structure, and improvement of corporate culture system, promoting the overall strength of the enterprise.

Quality Service

Company there are more than 20 employees with high/intermediate technical titles and a sales and service team of over 30 people; Management creates value, service enhances advantages, quality first, and service excellence "is the company's development philosophy.

Excellent Quality

Kunpeng spreads its wings, aiming for lofty goals; The road ahead is full of obstacles, and the journey never stops! Our mission is to uphold excellent quality and provide global services to Anda. In the process of development, we continuously contribute excellent products to society, complement the advantages of various sectors of society, and create brilliance together!

Diversified Products

The "Ding Anda" brand has evolved from a glass trading company to a comprehensive and powerful enterprise with diversified operations. We have diversified products in the fields of glass machinery, chemical brand "Glass Doctor", integrated production and sales of doors and windows, intelligent warehousing and logistics, etc.

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Types of Tests the Insulation Detector Can Perform

Spot reading test
The Spot Reading test is the first form of insulation resistance test we'll look at. Simply connect the megohmmeter leads across the insulation to be tested, apply test voltage for a set amount of time (10 mins max), and obtain a resistance measurement. Spot testing is appropriate for systems with a minimal or insignificant capacitance impact, such as a short wiring run.

Time resistance test
The Time Resistance test, commonly known as the dielectric absorption test, is another method for measuring insulation resistance. It entails running a 10-minute test. Measurements are conducted every 10 seconds during the first minute when absorption current has the greatest influence on resistance. Measurements are done once per minute after the first minute.
When you plot the findings, you should observe a curve that begins reasonably quickly and then progressively climbs during the testing time. Moisture, grime, or other causes may be damaging your insulation if the curve is generally flat or begins to drop down as the test goes. This test is best for large rotating electrical machinery.

Step voltage test
The Step Voltage test is a third way. This test is more commonly used in the newer Insulation Testing equipment. It entails comparing the findings of at least two or more test voltages. The test starts with a low beginning test voltage. Measurement is taken at a predetermined time, generally one minute, and then the test voltage is raised. Typically, this rise is five times the original voltage. This procedure can be repeated numerous times, with measurements taking place after one minute and the test voltage increasing at a five-to-one ratio over the preceding voltage.
The Step Voltage test is intended to induce electrical strains on internal insulation fractures, detecting possible faults that would not be disclosed by lower voltage testing. Dry, clean, and in excellent physical condition insulation should yield about the same resistance values over the voltage range.

Why do I need an Insulation Detector?

Insulation Detectors are popular for three main applications:
• Testing the condition or integrity of electrical wires
• Testing the windings of a motor
• Testing electronic devices
The insulation test is performed on conductors to test how resistant they are to current flow and current leakages. A test voltage is applied using the Insulation Detector across the conductor to measure the amount of current flowing through it, thus proving if the insulation in the conductor is in good condition or not.
For motors, it is necessary to test their winding insulation to make sure environmental factors such as moisture, high humidity, and impurities have not affected the quality of the windings. A test voltage of 500 V to 1000 V is applied across the windings, if the resistance is 10 MΩ or greater than the insulation of the winding is in excellent condition.

What Are the Functions of Insulation Detector?

1. Insulation resistance measurement: Its main function is to measure the insulation resistance of electrical insulators. It uses voltage and current to calculate resistance by applying a high DC voltage across an insulator and measuring the resulting current. This measurement helps determine the condition and effectiveness of the insulation.

2. Selectable test voltage: Many Insulation Detectors allow users to select different test voltages according to the type and rating of the insulation being tested. Different insulating materials require specific test voltages to accurately evaluate their insulation resistance.

3. Resistance range: The Insulation Detector provides a wide range of resistance measurement functions to suit various insulation systems.

4. Polarization Index (PI) and Dielectric Absorption Ratio (DAR): Some Insulation Detectors provide additional functions, such as PI and DAR measurements. The polarization index indicates an insulator's ability to recover after a high-voltage stress test, while the dielectric absorption ratio measures an insulator's ability to hold an electrical charge over time.

5. Automatic discharge: Insulation Detectors usually have an automatic discharge function, which can safely discharge the residual voltage in the device or system under test after the insulation resistance measurement is completed.

How Does an Insulation Detector Work?

Voltage application: Insulation testers generate high DC voltages, typically ranging from a few hundred volts to thousands of volts, depending on the insulation being tested. A voltage is applied across the insulator under test.

Insulation resistance measurement: When a high voltage is applied, a small current flows through the insulating material. Insulation testers use sensitive internal circuitry to accurately measure this current.

Ohm's law calculation: The insulation tester uses Ohm's law to calculate the insulation resistance. By measuring the current and knowing the applied voltage, the tester can determine insulation resistance.

Display and readout: The insulation tester provides a digital display or readout that shows the measured insulation resistance in megohms (MΩ) or gigaohms (GΩ). This value indicates the quality and condition of the insulation.

Discharge of capacitive load: After the insulation resistance measurement is completed, some insulation testers have an automatic discharge function. It safely discharges any residual voltage that may exist in capacitive loads, ensuring the safety of technicians and preventing potential electric shock.

What Is the Difference Between Insulation Detector and Megger Test?

These two are often used interchangeably, and they both refer to measuring insulation resistance with an insulation tester or megohmmeter. However, there is a slight difference between the two:
Insulation Testing: The term "insulation testing" is a broad and general reference to the process of measuring insulation resistance. It involves measuring the insulation resistance of various electrical components and systems using any suitable insulation tester, including a megohmmeter.
Megger Testing: The term "megger testing" refers specifically to insulation resistance testing using a brand of insulation tester called a megohmmeter. The term "megger test" has become synonymous with insulation resistance testing, especially when it comes to the use of megger instruments.

The principle of Insulation Detector?

The working principle of insulation resistance tester is based on the fact that insulating materials have a very high resistance to electrical current.

Insulation resistance testers utilize a high-voltage DC signal to be applied to the insulator being tested, and subsequently gauge the current that travels through the insulator. The tester then calculates insulation resistance by dividing the applied voltage by the measured current.

Testers typically have a range of voltage settings, depending on the type of insulation being tested. For example, a lower voltage setting can be used to test low-voltage cables, while a higher voltage setting can be used to test high-voltage cables or motors.

In addition to measuring insulation resistance, some insulation resistance testers can also measure other parameters, such as polarization index (PI) and dielectric absorption ratio (DAR), which can provide additional information about the condition of the insulation.

It is important to note that insulation resistance testing should only be performed by qualified personnel and proper safety precautions should be taken to avoid injury or equipment damage.

Precautions for Insulation Detector

Preparation before testing

Ensure that the electrical equipment to be tested has been disconnected from power and confirm that the equipment is completely voltage free. Check if the switch of the electrical equipment has been turned off and unplug all plugs.

Instrument calibration

Use professional insulation resistance testing instruments, such as multimeters and insulation resistance testers, and perform accurate calibration to ensure the accuracy of test results.

Test environment

Avoid testing in environments with high humidity or low temperature to avoid interference with test results.

Test operation

Select the appropriate test voltage and time. Excessive voltage or time may cause damage to the insulation material of the equipment. Pay attention to the changes in insulation resistance and record the test results in a timely manner.

Safety precautions

During the testing process, the testing personnel should wear long sleeved cotton work clothes and insulated shoes, wear a safety helmet, and the operator should stand on the insulated mat. It is prohibited to use insulation resistance meters during lightning or near high-voltage equipment to avoid danger.

Our Factory

DingAnDa Company was established in 1997 and is located in Tianjin, the logistics center city of North China. After more than 20 years of development, the "Ding Anda" brand has evolved from a glass trading company to a comprehensive and powerful enterprise with diversified operations. We have diversified products in the fields of glass machinery, chemical brand "Glass Doctor", integrated production and sales of doors and windows, intelligent warehousing and logistics, etc; The headquarters is located in the beautiful city of Tianjin, radiating across the country with three major industries: glass, doors and windows, and warehousing. It is sold overseas through Qingdao and Tianjin Linhai ports.
Seeking development through innovation, establishing a brand through responsibility, and creating a model of value for Dinganda National Enterprise; Since its establishment, the company has gathered industry elites and continuously pursued the expansion of production scale, rationalization of product structure, and improvement of corporate culture system, promoting the overall strength of the enterprise.
The factory covers an area of 20000 square meters and has a reasonable talent structure, with multiple mechanical, electrical engineers, and chemical engineering PhDs as technical backbones. There are more than 20 employees with high/intermediate technical titles and a sales and service team of over 30 people; Management creates value, service enhances advantages, quality first, and service excellence "is the company's development philosophy.

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FAQ

Q: How to choose a suitable insulation detector?

A: Choosing a suitable insulation detector requires considering factors such as measurement range, measurement accuracy, output voltage level, and output short-circuit current. At the same time, it is also necessary to choose according to the characteristics of the product under test and the test environment.

Q: What is the main function of the insulation detector?

A: The main function of the insulation detector is to measure insulation resistance. At the same time, it can also measure parameters such as absorption ratio and polarization index to comprehensively evaluate insulation performance.

Q: When measuring capacitive load resistance, what is the relationship between the output short-circuit current of the insulation detector and the measured data?

A: The size of the insulation detector output short-circuit current can reflect the size of the internal resistance of the instrument's internal output high-voltage source. When the product under test has capacitance, the high-voltage source in the insulation detector charges the capacitor through its internal resistance at the beginning of the test, and gradually charges the voltage to the rated output high-voltage value of the insulation detector. If the capacitance value of the product under test is very large, or the internal resistance of the high-voltage source is very large, the charging process will take longer. At the same time, the measured resistance value will be smaller due to the influence of the capacitor charging current.

Q: Why is it required to measure the absorption ratio and polarization index when measuring insulation?

A: In insulation testing, the insulation resistance value at a certain moment cannot fully reflect the insulation performance of the tested product. On the one hand, for insulation materials with the same performance, the insulation resistance is small when the volume is large, and the insulation resistance is large when the volume is small. On the other hand, after the high voltage is applied, the insulation material will have charge absorption and polarization process. Therefore, it is necessary to measure the absorption ratio (the ratio of R60s to R15s) and the polarization index (the ratio of R10min to R1min) to determine the insulation condition.

Q: What is the role of the "G" terminal in the insulation detector?

A: The "G" terminal is a shielding terminal, which is used to eliminate the influence of moisture and dirt in the test environment on the measurement results. It bypasses the current leaking from the surface of the tested product so that the leakage current does not pass through the test circuit of the instrument, thereby eliminating the error caused by the leakage current.

Q: Under what circumstances is it necessary to use the "G" terminal of the insulation detector?

A: In a high-voltage, high-resistance test environment, especially when the surface of the tested product is moist and seriously polluted, the "G" terminal needs to be used to eliminate the error caused by the leakage current.

Q: What effect will the low battery voltage of the insulation detector have on the measurement results?

A: Low battery voltage will cause the circuit to not work properly, so the measured readings are inaccurate.

Q: How to correctly connect the test wires of the insulation detector?

A: The "L", "G", and "E" terminals of the insulation detector should be correctly connected to avoid wrong connections or connecting the "G", "L" wires and the "G", "E" wires to the two ends of the tested product.

Q: What is an insulation detector?

A: An insulation detector is an instrument used to measure the insulation resistance of electrical equipment and to evaluate the insulation performance of the equipment.

Q: Can a megohmmeter be used to directly measure a live tested product?

A: For personal safety and normal testing, it is not allowed to measure a live tested product in principle. Live measurement not only results in inaccurate results, but may also cause danger to testers.

Q: What is the principle of the insulation detector to generate high-voltage DC?

A: Based on the principle of DC conversion, the insulation detector uses a boost circuit to increase the lower supply voltage to a higher output DC voltage. Although the high voltage is high, the output power is small.

Q: What are the reasons for inaccurate measurements of insulation detectors?

A: The reasons for inaccurate measurements may include insufficient battery voltage, incorrect test line connection method, "G" terminal not connected, excessive interference, human reading errors, and excessive errors in the instrument itself.

Q: When measuring insulation resistance, why does the voltage measured by a pointer multimeter drop a lot, while a digital multimeter does not?

A: This is because the internal resistance of a pointer multimeter is small, while the internal resistance of a digital multimeter is relatively large. When measuring with a pointer multimeter, due to the small internal resistance, the output voltage at the L-E terminal of the insulation detector drops a lot, and is not the output voltage during normal operation. A digital multimeter can measure the output voltage more accurately.

Q: What preparations are required before using an insulation detector?

A: Before use, you need to check whether the battery of the insulation detector is sufficient, whether the test line is connected correctly, and whether the instrument is in normal working condition. At the same time, you also need to ensure that the product being tested is powered off and in a safe state.

Q: How long is the calibration cycle of the insulation detector?

A: The calibration cycle of the insulation detector should be determined according to the frequency of use and the measurement accuracy requirements. Generally speaking, it is recommended to calibrate once a year to ensure the accuracy of the measurement results.

Q: The insulation detector suddenly shows a drop in resistance value and rapid swings during the measurement process. What may be the reason?

A: This may be caused by discharge and ignition of some parts of the test system. It is necessary to check whether there is breakdown discharge or arcing in the test line, the product under test, and the instrument itself.

Q: What are the requirements for the storage environment of the insulation detector?

A: The insulation detector should be stored in a dry, ventilated, non-corrosive gas environment. Avoid long-term exposure to high or low temperature environments to avoid affecting the performance and accuracy of the instrument.

Q: What are the maintenance and maintenance methods of the insulation detector?

A: The maintenance and maintenance methods of the insulation detector include regular cleaning of the instrument surface, checking whether the test line is intact, replacing damaged parts, and regular calibration. At the same time, care should be taken to avoid damage to the instrument such as impact or falling.

Q: What environmental factors affect the readings of the insulation detector?

A: The readings of the insulation detector may be affected by environmental factors such as ambient temperature, humidity, electromagnetic interference, and the surface condition of the product being tested. Therefore, it is necessary to try to eliminate the influence of these factors to obtain accurate results during measurement.

Q: How to judge whether the measurement results of the insulation detector are reliable?

A: The reliability of the measurement results of the insulation detector can be evaluated by comparing the consistency of multiple measurement results, comparing with other measurement methods, and referring to relevant standards and specifications. At the same time, it is also necessary to check whether the instrument itself has a fault or the error is too large.

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