Huazheng HZDL130 Primary Current Injection Test

I.Summary

Characteristics

1. Voltage and current 6 and half LCD display, with higher display precision and more accurate experimental results

2. 128*64 dot matrix liquid crystal display, display data more intuitive, faster reading

3. The instrument display lock function, especially for the transformer to read more accurately and quickly than in the experiment

4. Polarity measurement, ct polarity automatic measurement, no need for separate test

5. Time meter: 0.01 s-9999.999 S liquid crystal display

6. Added self-locking function

7. Variable ratio automatic detection function

8. Added internal stop meter function

9. Beautiful and generous PVC panel is adopted to make the panel more resistant to dirt and wear

10. High measuring accuracy, 0.5 grade

Operational aspects

(1) After the completion of wiring, check whether there is any wiring error and whether the connector is in good contact.

(2) During the test, if there is any abnormal phenomenon such as lighting or no display when starting up, the power should be immediately turned off and the wiring should be rechecked.

(3) During actual wiring, the current output terminal should form a circuit, or the instrument will not output current.

(4) The current riser is equipped with random output conductor; The output external copper wire is selected according to 10A/mm2. (two 3-meter test wires are standard)

(5) The capacity of the equipment is designed for short-time work of 5 minutes. If it is used for batch test, the working time should be less than 2.5 minutes. Wait for 10 minutes before the next work. If do temperature rise (30 minutes -24 hours) should be prepared according to long-term working temperature rise.

II.The Technical Features

2.1 Power：5KVA

2.2 Output voltage： series：AC 0～500A（10V） parallel：AC 0～1000A（5V）Stepless adjustable

2.3 Output voltage： (>10V)

2.4 Output waveform: the output current is the standard sinusoidal wave with small burrs, which is better than the standard power system requirements.

2.5 Measuring accuracy :(using grade 0.2S material) the actual value is around 0.3; Each current can be smoothly, smoothly and continuously adjustable, and the precision is higher than 0.5 level. The current voltmeter shows true and effective value with high accuracy and stability.

2.6 Output current mode: true RMS value is continuously adjustable;

2.7 Structure and form: integrated

2.8 wiring mode: according to requirements

2.9 current stability: 0.2%;

III.Working principle

The instrument measuring circuit includes a current measuring circuit and a current measuring circuit. (voltage test can be added as required) with extended volt-ampere characteristics.

The current measurement circuit includes micro-current zero impedance CT, program-controlled amplifier circuit and sampling circuit.

Voltage measurement circuit includes PT isolated signal acquisition circuit, program controlled amplifier circuit and sampling circuit.

By 16 bit single chip microcomputer using computer digital real-time acquisition method, by measuring the voltage signal amplitude, according to the voltage proportional relationship, high pressure can be calculated measured voltage value, by measuring the voltage signal amplitude and setting value compared to realize the function of automatic timing, according to the current proportion relations, can calculate the current output size, by measuring the current/voltage signal amplitude comparing with set point to realize the function of over-current protection.

Transportation and Maintenance

1.Transportation

This product must be packed during transportation. The packing cases should be wooden cases with foam and other shock-proof layers. Packaged products, should be able to road, rail, air transport. In the process of transportation, it shall not be placed in the open carriage, and the warehouse shall pay attention to prevent rain, dust and mechanical damage.

2. Store

The instrument should be stored in a room with ambient temperature of -20℃ ~ 60℃, relative humidity not exceeding 85%, ventilation and no corrosive gas. It should not be placed close to the ground and walls.

3. The moisture

In humid climate or wet season, if the instrument is not used for a long time, it is required to turn on the power once a month (about 2 hours) to release moisture and protect electronic components.

4. Prevent exposure

When the instrument is used outdoors, avoid or reduce direct sunlight exposure to the display screen as much as possible.It can't be put in a very damp warehouse.