JOSEF LLJ-1000FG Leakage Relay Hardware Tools

Description :

　　LLJ-15FG leakage relay; LLJ-63FG leakage relay

　　LLJ-120FG leakage relay; LLJ-100FG leakage relay

　　LLJ-200FG leakage relay; LLJ-250FG leakage relay

　　LLJ-400FG leakage relay; LLJ-500FG leakage relay

　　LLJ-320FG leakage relay; LLJ-630FG leakage relay

　　LLJ-1000FG leakage relay;

　　1、 Product Usage and Characteristics

　　The LLJ-FS series leakage relay (hereinafter referred to as the relay) is suitable for use in AC voltage systems ranging from 660V to 1140V, with a frequency of 50Hz and a current of 15~4000A. It is used to determine whether there is a neutral point in the circuit

　　Leakage protection This relay can be used to form a leakage protection device with circuit breakers, AC contactors, magnetic starters, etc. equipped with shunt release or voltage loss release, for the purpose of leakage and electric shock protection

　　A leakage alarm device is composed of various sound and light indicating devices such as buzzers and signal lights.

　　LLJ relay is divided into guide rails There are two installation methods for the panel Small size, easy to use, fixed or adjustable action values, reliable action, stable continuous power supply, and easy operation. Can adapt to users from all over the world,

　　It can be used for ground fault protection of power lines to prevent equipment accidents or electrical fires caused by ground fault currents, and can also be used to provide indirect electric shock protection for human electric shock relief. it

　　Suitable for low-voltage distribution systems with direct grounding at the center point of the power system or underground coal mine distribution systems without neutral grounding, it is a safe new product for network transformation. The action time of this relay is fast

　　Speed type and delay type, when used together, provide graded protection for main and branch lines.

　　2、 Working principle

　　This relay is an electronic current operated leakage relay, mainly composed of a zero sequence current transformer electronic circuit, a test circuit, and an outlet relay. Its working principle is as follows: the wiring is shown in the diagram on the right, and when passing through

　　When there is ground leakage in the circuit of the zero sequence current transformer, iAtiB+iC+iN head will be 0, and an induction signal will be generated on the side of the zero sequence current transformer. This signal is processed by an electronic circuit, and when the leakage current reaches

　　When the action value is reached, the thyristor is turned on, the outlet relay is activated, and the main circuit breaker or contactor is controlled to disconnect using normally open and normally closed contacts, thereby achieving the purpose of protection. The experiment is carried out by resistance

　　Composed of buttons and other components, when the button is pressed, current flows through the transformer, which is equivalent to leakage in the main circuit, and the product should be activated.

　　3、 Technical data

　　Rated voltage: 380660690

　　Rated leakage current (mA): 30mA~500mA User selected

　　Rated leakage non operating current (mA): 15mA-250mA User selected

　　Fast action time type: ≤ 0.1S

　　Action time delay type: 0.1~1s

　　Contact capacity: 220V5A

　　Action current 30~500mA

　　Zero sequence aperture: 25mm~220mm

　　Host size: 88 * 36 * 60mm

　　4、 Model meaning

　　S: Delay type (no S for fast type)

　　T: Installation method: T represents embedded panel type

　　Leakage relay is a type of device that detects circuit contact (leakage) and sends a mechanical opening and closing signal to the control circuit device. It can be combined with various specifications of low-voltage circuit breakers or AC contactors to form a residual current operated protector. Nowadays, a relatively complete rural low-voltage power grid classification (second or third level) leakage protection mode has been achieved, which has become an important component of the overall line protection device and plays an important role in preventing line and equipment leakage and personal electric shock.

　　Due to the use of residual current relays for equipment protection, their safety performance should be able to be tested. For this purpose, a test button is added to the leakage relay to test its protective performance. When the button is pressed, a test current flows through the magnetic ring, and the leakage relay should act quickly. If the leakage relay does not operate, it indicates that there is a fault and it must be stopped immediately. The commonly used residual current device is equivalent to a combination of automatic switch and residual current relay, mainly used for personal safety protection. The human body can feel a current of 2 mA when exposed to 50 Hz AC power, while a current of 30 mA or higher can be fatal. Therefore, when selecting, attention should be paid to the magnitude of the operating current of the leakage protector. In order to reliably operate under small signals, the leakage protector is equipped with an electronic circuit that ignites small signals.

• Leakage relay