How to choose household life electricity single phase leakage protector

When the human body and the earth are not insulated from each other, the person touching the phase line on the ground is called a single-phase electric shock. In the low-voltage power grid, when a single-phase electric shock occurs or a household appliance device leaks to the ground, the device that cuts off the power supply can be automatically completed within a specified time, which is called a leakage protector or an automatic leakage switch. Household electricity consumption is generally single-phase. In household electricity consumption, installing single-phase leakage protector is one of the most important technical measures to prevent personal single-phase electric shock and protect the safe operation of household appliances.

1. Must use products that meet national technical standards

The single-phase leakage protectors currently on the market are current-type. The national standard GB6829-86 "Leakage current action protector" promulgated and implemented on July 1, 1987 puts forward specific requirements for the technical conditions and test methods of current type leakage protector products. In the same year, the State Machinery Commission issued a document stipulating that a mandatory safety certification system should be implemented for the leakage current action protector, which is organized and implemented by the China Electrotechnical Products Certification Committee. Products that pass the safety certification will be issued a production license. Therefore, when purchasing a household single-phase leakage protector, the user must select a product that complies with BG6829-86 and is safety-certified. This product will be printed on the manufacturer's product manual with the instructions of “Through the China Electrotechnical Products Certification Committee Safety Certification, Certificate No.××××××, in line with the standard: BG6829-86”.

2. The technical performance indicators of selected products should be suitable for the needs of household electricity

The technical performance indicators of single-phase leakage protector products, for the user to choose, should mainly understand the following items:

(1) Rated voltage, frequency

The rated voltage of the leakage protector is AC 220V and AC 380V. The household use power is single phase, so the rated voltage is 220V/50Hz.

(2) rated current, overcurrent release rated current

The rated current of the leakage protector mainly includes 6, 10, 16, 20, 40, 63, 100, 160, 200, 250, 400A and other specifications. For leakage protectors with overcurrent protection, there are several overcurrent release rated current values ​​at the same rated current. Such as DZL18-20/2 leakage protector, it has leakage protection and overcurrent protection function, its rated current is 20A, but its overcurrent release rated current is 10A, 16A, 20A, that is, the same DZL18-20 There are three different specifications for the /2 model, so pay attention when choosing. Under the AC 220V working voltage, the user can roughly estimate the rated current of the leakage protector with a current of 4.5 to 5A at a load of 1 kW. If the total power of a household electrical equipment is about 4 kW, a single-phase leakage protector with a rated current of 20 A should be used. The selection of the rated current of the overcurrent release should be as close as possible to the actual current of the household electricity. In the above example, although the total power of the household electrical equipment is 4 kW, the chances of all household electrical equipment being fully turned on at the same time are very few, and for a single piece of electrical equipment, the working time is also certain. It is full load. Therefore, in the above example, if the household uses a single-phase leakage protector with overcurrent protection, the rated current of the trip unit should be selected as 16A. Under normal circumstances, the rated current value of 0.85 to 0.9 times can be determined as the rated current value of the overcurrent release.

(3) pole number

The leakage protector has two poles, three poles and four poles. The household life should be equipped with a 2-pole leakage protector.

(4) Rated leakage current

The rated leakage current is the value of the leakage current that must be operated to ensure that the leakage protector operates under the conditions specified by the manufacturer. The rated leakage current of the leakage protector is mainly 5, 10, 20, 30, 50, 75, 100, 300, 500, 1000, 3000 mA and so on. Among them, the sensitivity is less than or equal to 30 mA; the sensitivity is greater than 30 mA and less than or equal to 100 mA: the sensitivity is greater than 1000 mA. The main purpose of the household electric power distribution is to prevent personal electric shock. Therefore, high-sensitivity products with rated leakage current less than or equal to 30 mA should be selected. In fact, if it can be used as a leakage protector for personal protection, it can of course be protected from leakage fire and equipment leakage damage.

(5) rated leakage operation time

The rated leakage operating time is the maximum leakage breaking time corresponding to the rated leakage operating current under the conditions specified by the manufacturer. The rated leakage operation time of the single-phase leakage protector is mainly less than or equal to 0.1 second, less than 0.15 second, less than 0.2 second, and the like. For a fast-type leakage protector less than or equal to 0.1 second, a single-phase leakage protector for household use to prevent personal electric shock is the main purpose, and a quick type product of less than or equal to 0.1 second should be selected.

3. Consideration should be given to the various protection features of single-phase leakage protectors

Recently, the single-phase leakage protector suitable for living in the market, from the protection function, there are three types of leakage protection, leakage protection and overcurrent protection, and leakage, over current and short circuit protection. Special products do not have an overcurrent tripping mechanism, and are generally products with a small rated current.