QBZ30 (380/660) low price supply of mine vacuum electromagnetic starter

Mine flameproof vacuum electromagnetic starter QBZ-30/660（380） Magnetic starter

. summary

1.1 Purpose

QBZ-60 (30)/660 (380) mining flameproof vacuum electromagnetic starter (hereinafter referred to as the starter) is mainly applicable to underground coal mines with explosive gas mixture (methane) and coal dust. In the AC 50Hz power system with voltage up to 660V, it is used for local or remote control of the corresponding frequency and voltage of mining flameproof three-phase squirrel cage induction Motor For starting and stopping. Reversal of starter switch It has a certain breaking capacity.

The starter has the protection functions of overload, short circuit, phase failure, voltage loss, leakage lockout, overvoltage absorption, etc. The starter can reverse the rotation direction of the motor when it stops.

1.2 Normal working conditions:

a. The altitude does not exceed 2000m;

b. Operating ambient temperature - 5 ℃~40 ℃;

c. The relative temperature of ambient air is not more than 95% (25 ℃);

d. In the place without significant thermal shaking and shock vibration;

e. The installation inclination with the vertical plane shall not exceed 15 °;

f. In the environment without gas or steam that may damage insulation;

g. In places that can prevent rainwater or other liquids from entering;

h. Pollution level: Level 3;

i. Installation category: Class III.

1.3 Product classification

1.3.1 Product explosion-proof type: mine explosion-proof type

Explosion proof sign: Exd Ⅰ

1.3.2 Product model and its meaning:

GB3836 Explosive Environment

Enterprise standard Q/XM001-2011

two . Structure characteristics and working principle

2.1 The starter is controlled by the flameproof shell, AC vacuum contactor installed in the shell, disconnector, control button transformer , JDB protector, fuse, overvoltage protection and other components.

The starter shell is cylindrical, with a protruding bottom and cover. The shell cover and shell body adopt a rotary cover lip type structure, and the upper part of the shell is equipped with a junction box for lead-in and lead-out Cable Yes, the right side of the shell is equipped with a handle for operating the disconnector and a local control button, and a reliable mechanical interlock device is provided, which ensures that the shell cover cannot be opened when the disconnector is closed. Only when the stop button is pressed, the main circuit is disconnected, and the handle of the disconnector is pulled to the "off" position, can the interlocking rod be exited with a special tool and the housing cover be opened.

2.2CKJ _five Series three-phase AC vacuum contactor: used to connect and disconnect power lines, and equipped with two normally open and normally closed contacts for control lines. The working voltage of the contactor is AC36V;

2.3RL _five (2A) Screw fuse: connected to the control circuit for short circuit protection of the control circuit;

2.4R-C resistance capacitance device: connected to the load side of the starter (vacuum contactor) for overvoltage absorption protection.

2.5 Isolating commutation switch: it is used to isolate the power supply of the main line, so that there is no danger of electric shock when repairing the electrical components on the front of the bottom plate; It can also change the rotation direction of the motor when it stops.

2.6 Control button: LA-10, LA-10 start and stop button, for non remote start and stop of starter and signal line.

2.7 Step down transformer BK: for control line and local lighting (100VA), its working voltage is 380, 660/36V, and it can be used when the working voltage of main circuit is 380V, 660V.

2.8 Circuit diagram and working principle of starter.

2.8.1 The electrical schematic diagram of the starter is shown in Figure 1.

2.8.2 Operating principle of starter:

2.8.2.1 Turn on the reversing switch QS, the step-down transformer has 36V AC output, the ground leakage detection circuit in the motor integrated protection JDB detects the load, the insulation meets the requirements, and the normally open contacts 4 and 3 of the relay are closed, so as to prepare for power supply to the control line.

2.8.2.2 Press the start button QA, the contactor KM will pull in, and the main contact of the contactor will pull in.

The contactor coil turns to low current maintenance. At the same time, the parallel connection points at both ends of the starter button are closed to ensure QA self protection.

2.8.2.4 After pressing the stop button TA, the contactor coil is powered off and KM is disconnected.

2.8.2.5 When the motor is started or in the process of operation, overload, short circuit, phase failure, JDB normally open contact is broken, and the contactor is released.

2.8.2.6 Before each start, JDB leakage detection circuit conducts ground leakage detection on the load. When the insulation resistance of the main circuit to the ground does not meet the requirements, JDB normally open contact cannot be pulled in, making the contactor cannot be pulled in.

2.8.2.7 If it is necessary to change the direction of the motor, the contactor shall be disconnected first, and then the GHK handle shall be turned to change the phase sequence.

three . Technical characteristics

3.1 See Table 1 and Table 2 for the main technical parameters of the starter:

Table 1

Table 2