Insulation Tester 5kv

HM2305 Insulation resistance tester is designed and developed to evaluate the insulation quality of large high-voltage transformers, motors, generators, long distance power cables, tubular busbars and other electrical insulation under strong interference in the field of high-voltage substations and power plants. It is especially suitable for the testing field of large capacitive strong interference above 110kv.

Hot tags: Insulation Resistance Tester, insulation resistance meter , HV insulation tester

● designed in strict accordance with safety standards, output voltage: 250v、 500v、 1000v、 2500v、 5000v.

● automatic calibration function of the instrument, automatic calibration accuracy before test.

● device self-check function, can automatically detect whether the measurement circuit is normal.

● this instrument has the actual test live voltage measurement function, leakage current measurement function, automatic discharge function, through the actual test live voltage measurement function can intuitively see whether the drop voltage of the test instrument with load meets the national requirements.

● it can automatically measure and remember R15S, R60S and R10min, and automatically display the test value and test time of polarization index (PI), induced absorption ratio (DAR).

● superior anti-interference performance, when the interference current reaches 2mA, the instrument still guarantees the test accuracy and strong anti-interference ability, especially used for 110KV and above large-capacity transformer and long-distance power cable power system.

● automatic discharge: for large capacity test products, after automatic discharge, manual discharge is required.

● analog pointer and digital display coexist, the digital reflects the insulation resistance accuracy of the test, the analog pointer can reflect the dynamic change of insulation resistance during the test.

● alarm function during voltage boost, high voltage output of buzzer warning, away from the test site, the warning sound will automatically stop after the test.

● battery power digital display and under voltage alarm protection function (intelligent battery charging management).

● automatic shutdown function: this instrument has automatic shutdown function. After 10 minutes of measurement, automatic shutdown.

● short circuit protection, short circuit state leakage current large stop test.

● safety specifications

IEC 61010-1 CAT.IV 600V pollution level 2

IEC 61326 EMC specifications: electrical equipment for testing, control and inspection

IEC60529 IP64 (box closed)

The safety performance of the instrument conforms to international standard iec61010-1:2001.

This instrument complies with standard Q/WKD10.

Insulation resistance: 50M (between measuring line and housing)

withstａnd voltage: AC 10kV 50Hz 1min (between measuring line and housing)

operating temperature and humidity: -10℃ ~ +50℃ 85%RH

storage temperature and humidity: -15℃ ~ +55℃ 90%RH

charging power supply: 220V±10%, 50/60 HZ

battery power supply: 16V lithium ion rechargeable battery 2600mAH or measurement while charging, does not affect the test accuracy.

size: 27 ×22 ×15cm

weight: 3kg

test voltage accuracy: 99% to 110% of nominal value

voltage measurement accuracy: 5%+10V

short circuit current: 7-10ma.

display mode: digital and analog pointer dual display.

Manufacturers, laboratories, high-speed production lines, maintenance and other departments that need to meet quality standards

Cable manufacturing plant, switch industry, bus bar, battery, etc.

Electronic devices (capacitors, transistors, circuit boards, IGBTs, relays, etc.)

Household electrical production plants (washing machines, coffee makers, refrigerators, electric heaters, induction cookers, microwave ovens, etc.)

Industrial equipment (compressors, power tools, etc.)

Lighting industry (street lamps, professional lamps, medical lamps, bulbs, etc.)

Information technology industry (modem, satellite receiver, server, printer, ATM, etc.)

Testing center, certification laboratory (electronic instruments, devices, insulating materials such as plastics, ceramics, textiles, etc.)

Railway industry (train wiring, electronic cabinets, cables, etc.)

Transformers, coils, electronic engines, etc.

To measure the insulation resistance, generally use an insulation resistance tester to test. Insulation resistance tester is also called digital megohmmeter, pointer megohmmeter, insulation meter, insulation resistance tester, high voltage insulation resistance tester, insulation resistance measuring instrument, insulation characteristic tester, high voltage megohmmeter, with absorption ratio function Megger, megger with polarization index function, electric shaker, electronic insulation resistance tester, high-power and high-voltage megger, etc.

(1) Principle of insulation resistance tester:

The insulation resistance tester mainly uses a voltage to excite the device or network under test, and then measures the current generated by the excitation, and uses Ohm's law to measure the resistance. For example, compared to the ohmmeter function equipped on a digital multimeter (DMM), these electrical testers apply a much higher voltage when making resistance measurements. The voltage range used by the megohmmeter is usually from 50V to as high as 5 kV; and the voltage of a typical digital multimeter is generally less than 10 V. For insulation testing, the resistance value range that needs to be measured is large, the upper limit can reach 10TΩ, and the required voltage is higher.

(2) Performance of insulation resistance tester:

Insulation resistance testers, usually called megohmmeters or high resistance meters, are widely used to measure generators, motors, power transformers, wiring, electrical appliances and other electrical devices (such as control, signal, communication and power cables) Insulation resistance. They are often used in routine maintenance procedures to indicate changes in the insulation resistance of motors over months or years. A large change in insulation resistance may indicate a potential failure. Therefore, the megohmmeter needs to be calibrated regularly to ensure that the meter itself does not change over time.

(3) How to use the insulation tester:

When the insulation detector is working, it generates high voltage by itself, and the measurement object is electrical equipment, so it must be used correctly, otherwise it will cause personal or equipment accidents. Before using the megohmmeter, you must first make the following preparations:

(1) Before measurement, the power supply of the tested equipment must be cut off and short-circuited to ground. Never allow the equipment to be charged for measurement to ensure the safety of people and equipment

(2) For equipment that may induce high voltage, the measurement must be eliminated after this possibility.

(3) The surface of the measured object should be clean to reduce the contact resistance to ensure the accuracy of the measurement result.

(4) Before measuring, check whether the megohmmeter is in normal working condition, mainly check its "0" and "∞" two points. That is, shake the handle of the hand-cranked generator to make the motor reach the rated speed. When the megger is short-circuited, the pointer should point to the "0" position; when it is open, the pointer should point to the "∞" position.

(5) When using the insulation tester, it should be placed in a stable and firm place and far away from large external current conductors and external magnetic fields.

(6) The wiring must be correct. There are generally three terminals on the megohmmeter, of which L is connected to the conductor part of the object to be measured and the earth insulated, and E is connected to the shell or earth of the object to be measured. G is connected to the shield of the measured object or the part that does not need to be measured. When measuring insulation resistance, generally only the "L" and "E" terminals are used. But when measuring the insulation resistance of the cable to the ground or the leakage current of the device under test is serious, it is necessary to use the "G" terminal and connect the "G" terminal to the shielding layer or shell. After the line is connected, you can turn the crank clockwise. The shaking speed should be slow and fast. When the speed reaches about 120 revolutions per minute (ZC-25 type), keep rotating at a constant speed, and read after 1 minute. And read while shaking. Can't stop reading.

(7) Place the megohmmeter in a horizontal position during panning, and no short circuit between its end buttons is allowed when the handle is rotated. Shaking the handle should be slower and faster. If you find that the pointer is pointing to zero, it means that the measured insulation may have a short circuit. At this time, you cannot continue to shake the handle. To prevent heating and damage of the coil in the watch.

The reading is complete. Discharge the device under test. The discharge method is to remove the ground wire used in the measurement from the megohmmeter and short-circuit the device under test (not the insulation tester discharge).

(4) Precautions for insulation tester:

(1) It is forbidden to measure the insulation resistance during lightning or near high-voltage equipment, only when the equipment is not live. It is also measured without induced electricity.

(2) During the telemetry process. No one can work on the device under test. ,

(3) The insulation tester wires cannot be twisted together. To be separated.

(4) Before the megger stops rotating or before the equipment under test is discharged. Do not touch with your hands. Do not touch the metal part of the lead when removing the wire.

(5) At the end of the measurement. For large-capacitance equipment, discharge.

(6) The measurement cord from the megohmmeter terminal should be well insulated, and an appropriate distance should be kept between the two wires and between the wire and the ground, so as not to affect the measurement accuracy.

(7) In order to prevent the surface leakage resistance of the tested equipment, when using a megohmmeter. The intermediate layer of the device under test (such as the inner insulation between the cable shell cores) should be connected to the protective ring.

(8) Check its accuracy regularly.