Hughes' ACR series of reclosers is designed and manufactured in Sweden for use in overhead distribution lines, in distribution substation applications and as an advanced Smart Grid building block.
The ACR recloser purpose is to automatically clear faults with very short interruptions.

The ACR RECLOSER MODEL RANGE:

• ACR120 series for 6/15kV;
• ACR240 series for 22/27kV;
• ACR405 series for 33/40kV;

The ACR recloser of the latest generation has the following advantages:

• Low maintenance. Hughes reclosers are built to remain in operation for more than 30 years without major maintenance due to the highest quality materials used in its construction;
• Live tank construction (1). It completely eliminates the occurrence of internal arc faults and the risk of explosion or destruction inside the recloser switch tank. That makes it repairable in case one of the poles is damaged. It provides improved cooling of the vacuum interrupters due to unhindered air circulation. It has the increased creepage distance that allows the use of reclosers in an environment with a 4th degree of atmospheric pollution and cleaning of insulation without dismantling;
• Solid epoxy insulation (2) of bushings and insulators. Silicon coating provides UV protection, is environmentally friendly, does not contain harmful SF6 gas or oil;
• Vacuum interrupter bottles that can handle 20kA faults for 3s guarantee long term problem free operation in networks with many high current faults;
• Highest quality stainless steel (3) is used for most of the parts to minimize electrochemical corrosion. The use of stainless steel in accordance with DIN50049 / 3.1B, thanks to its non-magnetic properties, completely eliminates the occurrence of any kind of corrosion, including electrochemical corrosion over the entire life of the recloser;
• Spring stored energy operating mechanism (4). It provides turning On and Off the switch module even in the complete absence of power supply (voltage transformer malfunction, full battery discharge);
• Manual charging (5) of the spring mechanism as well as switch operation On and Off are possible with the help of maneuvering arms located on a switch body. The spring capacity is enough for the full reclosing cycle (Off - On - Off);
• Advanced protection relay with functions of directional fault detection, low earth fault detection, intermittent earth fault detection, automatic reverse power flow setting change;

OVX vacuum circuit breaker
The OVX series of vacuum circuit breaker is a modular building system, enabling to build easy tailored switches for different qualified solutions.

The basic OVX can have the following built-in optional components.

• Core balance current transformer (1) measures and detects extreme low earth currents and is suitable for all networks with isolated neutral point. This solution gives a secure detection of extreme low earth currents as the CCT unit combines all three phases in one winding;
• Phase current transformers (2). The OVX can be fitted with a combination of none, two or three phase current transformers with different winding ratio and with multiple tapings and with built in voltage sensors;
• Earth switch (3) is synchronized with the vacuum interrupter and cannot be closed when the vacuum interrupter is closed;
• Disconnector switch (4) gives visible open points of all three phases for extra safety. The disconnector is synchronized with the vacuum interrupter and cannot be open or closed when the vacuum interrupter is closed;