Overview
The HV disconnect switch mainly plays a safety role in the power grid.Its task is to open and close circuits under no load to achieve the purpose of power outage maintenance and circuit conversion.
In the closed state, the HV disconnect switch can reliably pass the rated current and carry the short-circuit current;
in the open state, it forms a clearly visible isolation fracture with reliable insulation, so that the lines that need to be repaired or segmented are isolated from the live lines.
Ensure the safety of maintenance personnel and line equipment.
Since the high voltage isolating switch does not have a special arc extinguishing device, it usually only opens and closes lines when there is no load.But when some special use cases, such as switching buses, switching off no-load transformers and no-load buses, etc., it should also be able to separate and combine the bus conversion current (circulating current), the excitation current of the no-load transformer, and the capacitive current of the no-load bus, etc.
Each phase of the HV disconnect switch structure consists of a chassis, a pillar insulator, a blade, contacts and other parts.
There are screws on the side of the blade to adjust the contact pressure and a spring for compression. The upper end is equipped with a fixed pull buckle and a self-locking device connected to it, which is used for opening and closing of the insulated hook rod.
The product has the advantages of large contact area, low contact resistance, good electrical conductivity and high mechanical strength.
Product implementation standards IEC62271-102, IEC60071-2, IEC60694.
Structure of HV disconnect switch
1、Main conductive part
Including: dynamic and static contacts, terminal board, self-locking device, blade,spring, limiter, etc.
2、Insulation part
Mainly refers to insulators
3、Base part
Contains: channel steel seat
4、Nameplates, anti-counterfeiting labels, etc.
5、Install accessories
Includes: installation angle steel, installation bolts, etc.
Selling points
1、Operating mechanism
Brand new operating mechanism refusal to refurbish
2、porcelain insulator
Good insulation high-quality insulator casting Durable
anti-fouling,no cleaning
3、Plastic spray bracket
Hot-dip galvanizing process with plastic，spraying on the
outer layer Not easy to rust support isolation switch
4、Good conductivity
The conductive parts of the wiring are silver plated and have
good adhesion Conductivity.
Operation of HV disconnect switch
HV disconnect switches, or isolation switches, are designed to isolate parts of an electrical circuit by interrupting the flow of electrical current. Unlike circuit breakers, which are meant to protect circuits from overload, HV disconnect switch is operated manually or remotely to ensure safety during maintenance or inspection.
Their operation is straightforward yet critical; by physically separating contacts within the switch, they create an air gap that ensures no current can flow through the circuit being serviced.
The design of these switches varies depending on their application but typically includes rotating, sliding, or swinging mechanisms to open or close the electrical circuit.
They must withstand the high voltages they control, often involving sophisticated insulation and arc suppression technologies to manage the electrical discharges that occur during operation.
Normal Operating Conditions
1、Ambient temperature: -40℃ ~+40℃ ;
2、Relative humidity: the daily average value is not biggerthan 95%, and the monthly average value is not bigger than 90%;
3、Installation location: the altitude does not exceed 1000m;
4、Wind speed: no more than 35m/s;
5、Ice coating thickness: no more than 10mm;
6、Installation location: There should be no risk of fire,explosion, chemical corrosion and severe vibration;
7、Earthquake intensity: no more than magnitude 8;
8、Not suitable for places with burning or explosion hazards,places with severe vibration or impact, conductive and chemical gas and areas with severe pollution and salt spray.
Ordering instruction
1、tem No；
2、Rated Voltage;
3、Rated Current;
4、Whether with arc extinguishing chamber;
5、Whether with mounting bracket ;
6、Please inform us with your special requirements.
