Mine Cable Resistivity Testing Equipment , Electrical Resistance Testing Equipment

Mine Cable Transition Resistance Testing Equipment / Test Apparatus

1. Application

ZY6221 Mine Cable Transition Resistance Tester is a special instrument for testing the transition resistance of rubber soft mineral cable. The instrument uses electric sampler to automatically display the transition resistance value and corresponding phase in the instrument with symbols and figures. It is convenient for sampling and reliable for testing. It is suitable for cable plants, mines, power transmission, scientific research and other units. It is a necessary instrument for quality inspection of mine cable products.

In order to use the equipment safely and correctly and give full play to its role, please read the instructions carefully before using the equipment.

2. Functional Characteristics

The instrument is divided into two parts: electrical test and mechanical transmission mechanism.

(1) Electrical test part: Microcomputer control, no mechanical potentiometer, test current automatic tracking adjustable output.

LED digital display, with unit, decimal point and overload automatic display.

Automatically detect the cable phase and display it with A, B and C luminescent tubes.

(2) mechanical transmission part: manual operation fixture, electric drill drill sampling.

3. Technical Target: Implementation Standard: GB1170 - 74

Measurement range: 0 - 20K Omega.

Range: 2K omega, 20K two gears

Test current: 0 - 5mA adjustable

Measurement accuracy: ± (0.5% reading ± 2 words)

Display: 3 1/2 bit LED digital display 0 --- 1999

Test rack:

(1) Sample length L ≤ 500 mm

(2) Outer diameter of specimen is 20 - 100mm

(3) Probe diameter ≤ 1.5mm

Power supply: 220V ± 10% 50HZ or 60HZ power < 70W

Ambient temperature: -10 ~ 40 ℃

Ambient humidity: less than 85% R.H

Instrument size: 110 * 440 * 320mm

Weight: 3kg

4. Sample Preparation

Except for the products in GB/T 12972.3 standard, take one insulated shielded cable or monitoring cable of arbitrary length and peel off the front of the cable with a knife to expose the sample shielded power line conductor (or monitoring line conductor).

The products in the GB/T 12972.3 standard can be either full length or at least 5m. At one end of the sample, a conductor and a concentric conductor are exposed. At the other end of the sample, the concentric conductor is stripped and bent outward, and the semi-conductive layer on the insulation is exposed at least 0.1m.

After sampling, clamp the sample with cable clamp.

5. Test Procedure

(1) Phase Discrimination

Three connecting wires are used to connect the back pink (positive), yellow (positive) and green (positive) terminals of the tester to three shielded power core conductors respectively. The grounding wires of the phase discriminant wires are connected to the hand drill of the metal needle (the phase discriminant wires are connected outside the hand drill, pay attention to reliable connection). Open the power switch and press the front panel. "Discrimination" key, with a diameter of less than 1.5mm metal needle into the cable, such as the instrument front panel indicator light, the phase has been selected accurately. If the front panel indicator is not on, re-insert the cable with a metal needle less than 1.5mm in diameter until the front panel indicator is on. After selecting the accuracy, it can enter the test step. When judging the phase of UYPTJ cable, three connecting wires are used to connect the rear red (positive), yellow (positive) and green (positive) phases into the metal shield of the ground wire respectively, and the judgment is made by pressing the "discrimination" key.

(2) Test Procedure

Select a good phase, remove the drill (gently pull up, you can drill down), keep the probe. The selected sample shielded power core conductor (or monitoring core conductor) and grounding core conductor are connected to the positive and negative poles of the back plate of the instrument respectively.

In the free state of the sample, press the front panel test range keys (20K, 2K) to measure the resistance of the circuit.

(3) Test points for each power cord and core for monitoring (except for products in GB/T 12972.3 standard).

For the products in GB/T 12972.3 standard, the exposed conductor ends are connected to the terminals of the rear panel (A (positive), B (positive) and C (positive) of the resistor with yellow, green and red connecting wires respectively. The probe of the drill is connected to the other terminal (N (ground)) by a black connecting line. The probe is vertically pressed on the exposed semi-conductive layer. The pressure is (30±5) N (controlled by hand). The resistance of the circuit is measured by pressing the front panel test range keys (20kΩ, 2KΩ). The distance is 20 mm, and 5 values are measured.

The probe of the drill has two metal needles not larger than 1.5 mm and a diameter of 5mm copper and zinc needles. When using a metal needle less than 1.5 mm, insert the probe into the hand drill and the metal needle into the probe provided by the instrument. When using the metal needle of 5 mm, insert the metal needle probe with 5mm into the hand drill. The probe should be inserted in the end, and the hand drill has a self tightening device. The products in GB/T 12972.3 standard use 5 mm copper and zinc needles, while other products use metal needles with diameter less than 1.5 mm. Gently pull up and you can drill down. When testing products in the GB/T 12972.3 standard, do not remove the drill.

6. Test Results And Treatment

The arithmetic average value of five measured values for products in GB/T 12972.3 standard shall not exceed the specified value of the standard.

For the evaluation of the transition resistance values of other mine cable products, the measured values of the transition resistance at each point shall not exceed the standard values.

7. Points For Attention In The Experiment

Discrimination and testing should be carried out separately, and the hand drill must be removed to retain the metal needle (except GB/T 12972.3).

When testing products in the GB/T 12972.3 standard, use the range 2KΩ file. Test the other products using the range 20KΩ file.

The hand drill has the function of positive and negative rotation. The positive probe is inserted into the cable and the metal needle with diameter less than 1.5mm is removed by reverse rotation. The switch is on the upper part of the hand drill.

After use, the front panel test button must be reset, and turn off the power supply.

The measurement error of 2KΩ gear and 20KΩ gear of this instrument is not more than (±0.5%Rd±20d) 200KΩ gear.

The rear panel has three positive terminal posts (red (positive), yellow (positive), green (positive), a negative black terminal, drilling power supply, etc. The "discrimination" key of the front panel range switch is the discrimination function, the 2KΩ gear and 20KΩ gear are the test function, and the display displays the measured values. The measurement shows "1" and the measured data exceed the range (or the connection is not connected well).

The function of the cable clamp is to make the sample straight and convenient to test.

When the power is turned off, the instrument displays different data when it is not tested.