Summary
Our company provides 24kV switchgear that are used in
three-phase AC power systems with a rated frequency of 50/60Hz.
Main switchgear characteristics:
1. Solid design and high IP protection
2. Exterior is made from aluminum zinc coated steel plate
3. Electrostatic spray used on cabinet door
4. High accuracy machining
5. Shock resistance
6. Oxidation resistance
7. Protection degree at IP4X level.
8. Anti-misoperation function ensures safety and reliability.
It complies with the following standards: IEC 62271-200, IEC
62271-1, DL/T 404
Ambient condition
1. Environmental ambient temperature: -15~+40 ℃;
2. Relative humidity: daily average ≤95%, monthly average
≤90%;
3. Altitude above sea level: ≤1000m;
4. Earthquake intensity: 8 degree;
5. Safety and Contamination: keep free from flames, explosion,
corrosive gases and
Structure feature
1. Enclosure and baffle plate
The enclosure and baffle plates are made
of Al-Zn coated steel plate assembled with bolts to ensure uniformity in size. It is
strongly antioxidant and corrosion-proof, which makes it superior to similar plates on
mechanical strength. The cubicle is divided into compartments and each is independently
grounded. The cubicle door is coated with a special plastic powder, so that the surface
is anti-impact and corrosion-proof, while ensuring a beautiful appearance.
2. Handcart
The frame of the handcart is made of the
steel and it is assembled with rivets. All handcarts have the same measurements and can
be used interchangeably. Convenient operation thanks to the buttons and position
indicators on the name plate. When the handcart is in the isolating/testing position it
is firmly connected to the earthing system and the instruments and control system is
connected to the cubicle through the secondary circuit. When the handcart is in working
position the primary circuit will be on while the circuit breaker is off.
3. Interlocking device for preventing misoperation
The cubicle has a reliable interlocking
device for protecting the operators and equipment.
4. Pressure-releasing device
The pressure-releasing devices are
respectively mounted on the top of handcart compartment, busbar compartment and cable
compartment to ensure the safety of operators and cubicle.
5. Position interlocking between secondary circuit and the
handcart
The connection between the secondary
circuit of the cubicle and the handcart's secondary circuit is realized through the
secondary plugging pieces. The movable contact lead of the secondary plug, covered with
a nylon bellows, can be connected with the handcart, and the secondary fixed contact
socket is mo united on the right-top of the circuit breaker compartment. The secondary
plug can be connected or released only when the handcart in the testing/isolating
position, however, when the handcart in the working position, the secondary plug will be
locked and not be released.
※: The short-circuit capacity of CT shall be separately considered;
※※: The back aerial outgoing scheme shall add an attached cabinet, and the user
shall consult the manufacturer about its depth. The cubicle of width 800mm applies
to the rated current up to 1250A.
※: As the circuit breaker is used to control 3.6 24kV motor, if the starting current is less than 600A, a metal oxide lightening arrester must be added, and the user shall consult the manufacturer about the detail requirements. As the circuit breaker is used to break capacitor bank, rated current of the capacitor bank shall not exceed 80% of that of the circuit breaker.
