QJGZ(1) Explosion Proof Intrinsic Safe High Voltage Vacuum Electromagnetic Starter

QJGZ(1) Explosion Proof Intrinsic Safe High Voltage Vacuum Electromagnetic Starter

The distribution device is used for high voltage motor direct start in coal mine where is filled with explosive gas(methane mixture) in the neutral point ungrounded three-phase power supplying system of rated voltage is 10KV, 6KV or 3.3KV, 50Hz, rated current range is 50A~630A.


Meaning of type

Technical descriptions
1.Adopts vacuum contactor, voltage(current) transformer and arrester integral installation. With reasonable structure, no additional track, strong with
interconnectivity and simple for maintenance & installation.
2.Uses 32 bit microprocessor intelligent protector of high protection precision and fast response speed; has the protection functions of ground connection, under-voltage, over-voltage, three-phase imbalance, overload, short-circuit, phase break, insulation surveillance, electric latch ,etc.
3.Indicates power grid voltage, current, capacity and insulation capability.
4.Uses RS-485 or CAN communication interface intrinsically safe type (as user’s request) can communicate with the host computer, the device has “4 remote control” function to realize no person on duty in coal mine.
5.With software and hardware self-check function, Malfunction information will be displayed.
6.Fast door-opening design with reliable mechanical and electric interlock, ensures the device is safe and reliable.
7.Distribution device can be used individually or with another one; when two sets of device are used together, flexible connection or non-flexible connection is available .
Updated advantages
The framework adopts manual rolling chassis car, operates with shaft principle, the
car moves steadily, achieves the functions of isolation switch on/off, compares to
traditional structure, it has following advantages:
1 Part of operation
The speed of traditional framework is different changed according to different people’s operation, which causes impact or switch on uncompleted; but for the manual rolling chassis operational framework, the car moves steadily, the speed of switch on/off the break is the same even if different people operates the isolated contacts.
2. Part of life expectancy
Due to fast speed the traditional framework operates in the process of switch on/off, big mechanical impact is effected on the moving contacts and fixed contacts, contact and contact box will be damaged, the life expectancy of contact isolation will be affected. Especially after a long time use, the connection part of contact will be mechanical transformed., the contacting resistance increases, vicious circulation will occur. Switch on/off progress of manual rolling chassis framework is even and steady, moving contact connects more smooth with fixed contact, the framework will not be transformed by people’s operation, which ensures the equipments’ life expectancy.
3 Part of connection
Contacts in the traditional framework connect by using inertia, especially after contacts connect with the complete contact, the contact false connection will occur, that would increase the resistance’s temperature, burn the isolation part and bring disaster. But the new framework of manual rolling classis car moves even and steadily, ensures the contacts can be reliable connected.
3. Part of linkage
Contacts in the traditional framework connect by using of inertia, when the break is closed or opened, it causes mechanical rebound, the small car couldn’t be accurate located, mechanical linkage will be unreliable.
Simultaneous linkage of accurate mechanical and electrical function is adopted in the manual framework with rolling classis, the framework could be operated safely in the mine substation.

The incandescent light source is replaced by LED light source for maintenance.
For the present market, there is no specialized light source for maintaining the high voltage vacuum distribution device, only traditional incandescent light source is adopted, the life expectancy is short, light effect is bad, these will bring unnecessary maintenance work for the equipments; however, we choose LED light source because it has advantages of high effect and unnecessary for maintenance.
Technical data


Rated voltage (KV)

Rated current (A)

Rated short circuit breaking current (A)

Rated short circuit making current (A)

Rated Peak

withstanding current (KA)

Duration of short circuit current (S)

Mechanical life (T)

External diameter of cable(Φmm)

Dimension W×H×D


Weight (kg)

Main circuit

Control circuit






























Refer to the Specific Functions as Follows

Functions description


Protection for short circuit current

Protection for overload current

Over current(over load) protection

Cable insulation surveillance

SectionⅠleakage protection

SectionⅡleakage protection

Generally reverse time limited current protection

Strong reverse time limited current protection

Extreme strong reverse time limited current protection

Power directional leakage protection

Low voltage linkage type current protection

Low(under) voltage protection(with or without time delay)

Alarming with low voltage

Simulated malfunction test function

Infrared remoter operation

Cabinet button operation

System online communication

Main remote measurement

Ia, Ic, Io, Uab, Ubc, P, Q,COSΦ, Insulated resistance

Function of far direction remote closing control and opening control

Protection for action latch

Remote signal

Wind and electricity latch(Choose open or close)

Gas latch(Choose open or close)

Electrical degree measurement

Function of malfunction wave recording intelligent analysis

Function of malfunction and accidents memory recording

Real-time clock

Second Zero differential protection

Hour Zero limitation intelligent backup protection

Self-motivated type different frequency leakage protection

Remote maintenance and soft ware remote updated function

Negative order, phase break and reverse protection

Unbalanced phase

People-computer interface

128×64 dot queue Chinese LCD

Precision of measurement displaying