Huazheng Manufacture HZ5374 OEM 4000A Primary Current Injection Test Kit

 HZ5374 primary current injection tester, referred to as (upper) is a test equipment developed by our company. It combines the advantages of similar products at home and abroad. It adopts numerical control technology and has strong anti-interference ability. Compared with the previous generation up , due to the low power consumption, large capacity self-coupling voltage regulator and the converter made of high magnetic permeability iron core, it has the advantages of large output power, small size and light weight. It is mainly used for primary busbar protection and various current transformer transformation ratio test items, and is widely used in scientific research, production and electrical test sites of electric power, railway, petrochemical, metallurgical and mining enterprises.

1. Principle block diagram (omitted)

2. Working principle

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

2. The voltage measurement circuit includes a PT isolation signal acquisition circuit, a program-controlled amplifier circuit and a sampling circuit.

3. The 16-bit single-chip microcomputer uses the computer digital real-time acquisition method to calculate the high-voltage measured voltage value by measuring the voltage signal amplitude and according to the voltage proportional relationship, and realizes automatic timing by comparing the measured voltage signal amplitude with the set voltage value. Function, according to the current proportional relationship, the output current of the device can be calculated, and the function of over-current protection can be realized by comparing the amplitude of the current/voltage signal with the set value.

1. Voltage output              7.Stop                                 13.Power Switch

2. Signal input                  8.Locking                            14.Grounding

3. Secondary current       9.Power Input

4. Current display            10.Normally open port

5. Time display                11.Normally closed port

6. Start                            12.Current Regulation

1. Transportation

This product must be packaged during transportation, and the packing box should be wooden box, and the packing box should be cushioned with foam and other shockproof layers. The packaged products should be able to be transported by road, railway and air. It should not be placed in an open-air car during transportation, and the warehouse should be protected from rain, dust, and mechanical damage.

2. Storage

The instrument should be stored in a room with an ambient temperature of -40°C to 60°C, a relative humidity not exceeding 82%, ventilation, and no corrosive gases. It should not be placed close to the ground and walls.

3. Moisture-proof

In humid areas or in humid seasons, if the instrument is not used for a long time, it is required to turn it on once a month (about two hours) to let the moisture escape and protect the electronic components.

4. Anti-exposure

When the instrument is used outdoors, try to avoid or reduce direct sunlight exposure to the display screen, and it cannot be placed in a very humid warehouse.