GW5-40.5 and GW4-40.5 are two different models of 40.5kV high voltage disconnectors. The main differences are in structural design, installation method, operating performance and applicable scenarios. The following are the key differences between the two:
1. Structural design
GW5 series:
Adopts a double-column horizontal rotary structure. The knife switches in horizontal rotation when opening and closing. The structure is symmetrical and the opening and closing action is stable.
Usually three-pole split type (each pole operates independently), and mechanical linkage is achieved through connecting rods.
The base is mostly welded with channel steel or steel plate, suitable for harsh outdoor environments.
GW4 series:
Adopts a double-column split structure. When the knife switches in, the two pillar insulators rotate in opposite directions, and the middle is disconnected or closed.
Compact structure, three-pole linkage design (synchronous operation of three poles through mechanical connecting rods), saving installation space.
2. Installation method
GW5:
Usually needs to be installed in phases, and each pole is fixed independently. It is suitable for substations with larger space or occasions that require phase maintenance.
The base installation requirements are high and the horizontality must be ensured.
GW4:
Designed for integral installation, the three poles share a set of bases, which is easy to install and suitable for places with limited space.
3. Operational performance
GW5:
The opening and closing torque is small, the operation is easier, and it is suitable for manual or electric operation.
Due to the horizontal rotation design, the arc extinguishing ability is strong, which is suitable for high-capacity current switching.
GW4:
The opening and closing speed of the split-center structure is faster, but the operating force is slightly larger, and it is often necessary to be equipped with a stronger operating mechanism (such as CJ6 electric mechanism).
4. Applicable scenarios
GW5:
It is mostly used in outdoor substations, especially suitable for occasions that require phase-splitting operation (such as single-pole maintenance).
Commonly used in new energy sites such as wind power and photovoltaics, and adapt to harsh environments such as strong winds and high altitudes.
GW4:
Applicable to compact substations or distribution systems, emphasizing space and cost saving.
Commonly used in urban power grids, industrial power distribution and other scenarios that are sensitive to installation size.
5. Other differences
Insulation performance: GW5 has a larger insulation distance and stronger pollution resistance due to its split-phase design; GW4 relies on the split-center design of the support insulator, and attention should be paid to insulation maintenance in a dirty environment.
Maintenance convenience: GW5's split-phase structure is convenient for single-pole maintenance, while GW4's integrated design requires three poles to be shut down for maintenance.
Summary
| Features | GW5-40.5 | GW4-40.5 |
|---|---|---|
| Structure | Double-column horizontal rotating type | Double-column center-open type |
| Installation | Phase-separated installation, independent base | Three-pole linkage, integral base |
| Operation | Small torque, smooth opening and closing | Fast opening and closing speed, requires greater operating force |
| Applicable scenarios | Outdoor, high altitude, split-phase maintenance | Compact space, urban power distribution |
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