Technical parameters: Rated working voltage
Rated working current
Breaking capacity
Agreed heating current +,
Operating angle
Number of mechanical operation cycles forward and reverse
/> The auxiliary contact is equipped with two pairs of auxiliary contacts, one normally open and one normally closed, for external circuit use. , ,
Dimensions*
Weight
Model
Installation and use:
/type-/type isolation commutation switch, according to the center height of its operating shaft and the way of use Different, it can be divided into horizontal type and vertical type
The horizontal installation center height and installation dimensions are as shown in the figure. The vertical installation center height is 3, and the installation dimensions are shown in Figure 3. The operating mechanism should be kept flexible during use. A small amount of lubricating oil can be added to the hinges of the moving parts to regularly check the working conditions of the contacts. If singeing is found on the contacts, they need to be repaired and repaired in time
Measure the closing condition of the contacts. After each load breaking, the working condition of the contacts needs to be checked.
Purpose:
type isolation commutation switch (hereinafter referred to as the isolation switch) is suitable for underground coal mines with AC rated operating voltage and rated current up to 3 and In the type electromagnetic starter, Linken explosion-proof is used to isolate the main circuit and change the phase sequence of the power supply under no load conditions. The isolator is equipped with reliable advance-action auxiliary contacts, which under normal circumstances ensure that the isolator can operate, connect and disconnect the isolated power supply and commutation under no load conditions. Under special circumstances (such as contact Welding failure of the contactor, etc.), the isolator has a certain breaking capacity. The improved isolating switch
of our factory has the characteristics of fast breaking, small contact resistance, non-melting and welding of the contacts, and long service life.
This isolator is an indispensable basic electrical component in large-capacity explosion-proof electromagnetic starters for mines.
Normal working conditions:
The altitude of the installation site does not exceed Condensation occurs on the surface of the product, so when the maximum temperature is +℃, the relative humidity of the air does not exceed. At lower temperatures
, higher relative humidity is allowed, such as up to +℃
A place without significant vibration and impact, without rain and snow damage, and without gas and dust that can corrode metal and damage insulation.
Structure:
The structure of the isolator is as shown in the figure. It consists of two parts: the contact assembly and the operating mechanism.
The contact assembly consists of three-phase static contacts, forward moving contact group and reverse moving contact group, closed arc barrier arc extinguishing cover, and insulating arc-resistant plastic frame and cover
. The silver alloy contact system adopts a single breakpoint snap-on structure, which is characterized by a double-backrest symmetrical structure for the static contact, and a magnetic conductor is set in the contact circuit to enhance the self-excited magnetic field. When breaking large currents, a strong electric repulsion force is generated between the static contact and the moving contact arm, which is beneficial to increasing the breaking speed. At the same time, it can also strengthen the arc blowing magnetic field and reduce the stagnation of the arc on the contacts. time, and increase the arc voltage rise rate, so that the arc quickly enters the arc extinguishing grid, thereby greatly improving the arc extinguishing effect during breaking. The forward and reverse moving contact groups use the operating mechanism and the cross conductive plate to realize the connection, breaking and replacement of the phase sequence of the moving and static contacts.
The operating mechanism consists of an operating panel, a coaxial four-bar linkage mechanism, an operating arm and an energy storage spring linkage mechanism. The two output shafts of the forward and reverse movable contact groups are connected to their respective operating arms. The power is input through the static contacts. When the operating panel is in the zero position, the forward and reverse movable contact groups are disconnected. state, the power supply is isolated. When the operating panel rotates clockwise, it drives a set of four-bar linkage mechanisms to drive the forward moving contact group to rotate and the static contacts close. The power is turned on, and the four-bar linkage mechanism passes dead center 3. After
Self-locking, the contacts gain the final pressure, the spring is stretched to store energy, and another set of four-bar linkage keeps the reverse moving contact group away from the static contacts, forming forward and reverse moving contacts
Head group interlock status. When breaking, turn the operating panel counterclockwise to the zero position. When the annular groove drives the four-bar linkage mechanism to pass the dead center, the tension spring immediately releases its energy and drives the contact group to quickly separate. Cut off the power when the operating panel moves from zero. By turning counterclockwise, the reverse movable contact group and the static contact can be closed and connected. When connected, the conductive plate is crossed to change the phase sequence of the output power supply and achieve phase commutation.
The auxiliary contact on the isolator is controlled by the cam of the operating panel. When the operating panel is at the zero position, the main circuit is isolated and its contacts are in a normally open (normally closed) state
When turned on During operation, its contacts lag behind the main contacts in closing (or opening); during breaking operations, their contacts lead in opening (or closing) in advance of the main contacts. Therefore, under normal circumstances, the isolator can reliably ensure making, breaking and reverse commutation under no-load conditions.
HG-315/1140 isolation switch