Scheme design of floor type and centre type circuit breaker
For 40.5kV circuit breaker, floor type-mounted seems to be more convenient, the operating mechanism is located directly at the bottom of the pole column, the depth of the handcart can be reduced, the handcart is convenient to pull the handcart out of the cabinet, without the need to transfer the handcart, after all, the 40.5 […]
Design of Internal Arc-Resistant Switchgear
The customer’s requirement is to pass an internal arc fault test with a 40kA 1s rating for a 17.5kV switchgear cabinet that is 650mm wide. Switchgear Cabinet Dimensions: Width: 650mm Depth: 1400mm Height: 2200mm Phase Spacing: 150mm Rated Voltage: 17.5kV Rated Power Frequency Withstand Voltage: 38kV Rated Lightning Impulse Withstand Voltage: 95kV Rated Current: 1250A […]
Contactor Applications
Contactors find application in various scenarios where the switching on and off of loads is necessary during normal operations. These applications include medium voltage public lighting and industrial motors. The combination of a medium-voltage contactor and a fuse controller, such as the F-C controller, is capable of controlling motors up to 12 kV. These medium-voltage […]
Short-time withstand
Low and medium voltage electrical components of the electrical parameters, many are similar, such as short-time withstand current Icw, are required to switchgear in the case of short-circuit faults, due to the circuit breaker tripping time required or faults caused by the absence of tripping, or sectional protection needs to be switched to withstand a […]
Comparison of epoxy resin and ceramics
While there are many formulations of alicyclic epoxy resins and many varieties of ceramics, each with their own specific qualities and parameters, there are some general comparisons . First, in the physical realm, the following relationships are typical: – The weight of an alicyclic epoxy resin is less than 70% of the weight of porcelain, […]
Low Voltage Switchgear Basics
Complete sets of equipment for rated voltages not exceeding 1000V AC and 1500V DC, fixed or mobile, with or without enclosures One or more low-voltage switchgear and related control, measurement, signalling, protection, regulation and other equipment, by the manufacturer is responsible for the completion of all the internal electrical and mechanical connections, with structural components […]
split-type and common box type ring network cabinet
split-type and common box type ring network cabinet, with the high level of manufacturing, the power supply department of the ring network cabinet requirements, so the split ring network cabinet used more and more. Split type, ring network cabinet in full accordance with the switchgear form of design and production, that is, each unit is […]
Medium and low voltage switchgear
Low and medium-voltage switchgear, customised to order requirements and according to specific electrical system diagrams. Engineering requirements vary and it is difficult to standardise and define products. Although the MNS low-voltage cabinets, KYN28 middle cabinet mechanism, appearance is similar, but the specific implementation of the project, large to the current specifications cabinet size, small to […]
Double-Layer Cabinets in Medium-Voltage Switchgear
Double-layer switchgear is not a new concept; it dates back to the 1950s when the United States introduced metal-clad double-layer withdrawable switchgear. This innovative design featured two double circuit breakers, eliminating the need for a separate instrument room. Instruments were integrated onto the door of the circuit breaker room, while relays, terminals, and other components […]
What is contact box
Medium-voltage metal-clad withdrawable switchgear cabinets require a contact box. The so-called contact box is actually a common name in the industry for an insulating sleeve used to install static contacts and to provide electrical isolation from grounded parts such as the mounting plate and the busbar phase. Why need contact box? Withdrawal type i.e. circuit […]