GW9-12/630A outdoor high-voltage disconnector, 10kV new type silicone rubber knife switch for pole installation

The GW9-10 disconnector is a single-phase AC 50Hz outdoor high-voltage switchgear with a rated voltage of 10kV. This equipment is mainly used for power supply isolation or line switching in 10kV power systems when there is voltage but no load. The open position has a visible disconnection mark and a reliable insulation distance. The product is divided into a general type and an anti-pollution type (GW9-10W), with current specifications ranging from 200A to 1250A. Its performance complies with the national standard GB1985—89. Each phase consists of a base frame, a post insulator, a knife switch and a contact. The knife switch is equipped with a contact pressure adjustment screw, a compression spring and a self-locking device, featuring an improved structure with large contact area, low contact resistance and high mechanical strength. Applicable environments include an altitude of ≤1000 meters and a temperature range of -40℃ to +40℃. The general type is suitable for conventional environments, while the anti-pollution type is suitable for heavily polluted areas. During operation, the sequence of closing the disconnector before closing the circuit breaker and opening the circuit breaker before opening the disconnector must be followed; it cannot directly cut off load current.

1) After opening, a reliable insulation gap is established, and the equipment or line to be maintained is separated from the power supply by an obvious disconnection point to ensure the safety of maintenance personnel and equipment.

2) Switch lines according to operation requirements.

3) It can be used to switch small currents in lines, such as the charging current of bushings, busbars, connectors and short cables, the capacitive current of switch grading capacitors, the circulating current during double-bus switching, and the excitation current of voltage transformers, etc.

4) Depending on the specific conditions of different structure types, it can be used to switch the no-load excitation current of transformers with a certain capacity.

High-voltage disconnectors are divided into outdoor high-voltage disconnectors and indoor high-voltage disconnectors according to their installation methods. Outdoor high-voltage disconnectors refer to high-voltage disconnectors that can withstand the effects of wind, rain, snow, pollution, condensation, ice and heavy frost, and are suitable for installation on terraces. According to the structure of their insulation pillars, they can be divided into single-column disconnectors, double-column disconnectors and three-column disconnectors. Among them, the single-column knife switch directly uses the vertical space under the overhead busbar for electrical insulation of the breaking point, so it has the obvious advantages of saving floor area, reducing lead wires, and making the open/closed state particularly clear. In the case of ultra-high voltage transmission, the effect of saving floor area is more significant when a single-column knife switch is used in a substation.

The GW9-10 disconnector is a single-pole disconnector with a single-break vertical opening structure. The post insulators are installed on their respective base frames, and it mainly consists of a base, a post insulator, a main conductive circuit part, a self-locking device, etc. It adopts a knife-switch structure to switch the line for cutting and closing. Each phase of the knife switch is composed of two conductive blades, and compression springs are installed on the outer sides of the blades. Adjusting the height of the springs can obtain the required contact pressure for the switch knife. When the switch is opened or closed, the operating mechanism part is operated with an insulating hook rod, and the knife switch has a self-locking device. When the disconnector is switched, it is operated with an insulating hook rod: the insulating hook rod buckles the lock hook of the disconnector, pulls the lock hook in the opening direction, releases the self-locking device, and then drives the connected conductive plate to rotate to realize the opening action; when closing, the insulating hook rod pushes against the lock hook of the disconnector to drive the rotating shaft to rotate, so that the connected conductive plate rotates to the closing position, and at this time the self-locking device locks the disconnector in the closing position.