Before introducing the current relay in detail,we still recommended to use the company's 94X microcomputer protection device,The series of microcomputer protection device is introduced by our company with current protection, voltage protection that on the basic configuration of digital protection unit,suitable for the 35kV and below voltage level with low current grounding system. Used s the main protection of all kinds of electrical equipment and lines;the price is over 1000 yuan,Generally it requires a time limit over current relay and an inverse time over-current relay in a high pressure tank,the price of the two device has not much difference between the one 94XMicrocomputer protection device,The series microcomputer protection device is the best choice to replace the traditional over current relay.
brief introduction of the Over current relay
Over current relay is a kind of protection used for the relay protection device for main equipment such as motor and transformer.The product has the characteristics of the time limit and the counter time limit,When the main equipment or power transmission and distribution system appears the fault of over load and over current or short circuit ,the over-current relay can reliably act or issue a signal in accordance with a predetermined time limit and remove the fault section So as to achieve the purpose of protecting the main equipment and
power transmission and distribution system.
Working principle of over current relay:
Over current relay achieve the protection of components mainly by the action of Over current protection. Over current relay determine whether the current through the line more than the standard through its own measurement elements，take time relay for delay element，to ensure that the device has a selective action with appropriate delay. At the same time the signal relay is used to send protection action signal.when it normally run ,Over-current relay and time relay are disconnected,When the fault or current is too large to be protected,Current relay run，Starting time relay through the contact of the contact point,After a predetermined delay,the time relay contact closure,Close the breaker trip,then the breaker trip,Faulty line is been removed,At the same time started the signal relay,Signal falling off and switch on the light or sound signal.
Common overcurrent relay model
JGL-10Over current relay with characteristic of inverse time ,used to the relay protection devices such as generators, transformers and power transmission and distribution systems.This product can issue a signal or remove the fault section timely according to the time limit for reliable action,when the equipment is overload or short circuit .mainly use the digital switch setting current value,Intuitive and convenient,change the value of the entire set without testing,The tuning range of 2-9.9A differential 0.1A；High precision, low power consumption, fast action time, high return coefficient.
JSL-10Over current relay is suitable for urban and rural power network power supply lines, transformer protection
, overload and short circuit protection.the realy is Integrated circuit static relay, Digital switch setting current value,Intuitive and convenient,change the value of the entire set without testing,The tuning range of 2.0-9.9A differential 0.1A;High precision, low power consumption, fast action time, high return coefficient,The structure is the same as the GL series over-current relay.
GL-10Overcurrent relay has a characteristic of inverse time ,Applied to the motor, transformer and other main equipment as well as the transmission and distribution system of the relay protection
circuit.When the main equipment or power transmission and distribution system is overload and short circuit fault, the relay can remove the fault part by scheduled time reliable action or signal, to ensure the safety of the main equipment and power transmission and distribution system.