A ring main unit (RMU) is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ring-type distribution network. 

The main functions of a Ring Main Unit (RMU) are circuit control, isolation from faulty equipment, and controlling circuits to switch functions. The main ring unit is deployed in a secondary distribution system 

Each RMU switchgear has three main functions. It controls the circuit to switch functions, isolates faulty equipment from the remaining circuit, and protects the circuit from short-circuit faults, the ground-fault current, as well as overloads. 

Ring Main Unit (RMU) is medium voltage switchgear that is employed in secondary distribution networks. They are utilized in-ring main electrical power distribution systems to provide a continuous power supply to the customer by shifting sources in event of any emergency or repair on the primary source. 

Categories. Ring main units can be characterized by their type of insulation: air, oil or gas. The switch used to isolate the transformer can be a fusible switch, or may be a circuit breaker using vacuum or gas-insulated interrupters 

Ready to Use Packaged Sub station is a type tested assembly comprising of an enclosure containing a medium voltage switchgear compartment, a distribution transformer compartment, a low voltage switchboard compartment along with interconnections to transform energy from medium to low voltage Systems.

The package & unit substation is a combination of the Ring Main unit, The Transformer and The Low-Voltage panel. A unit substation is a combination of a Transformer and a Low Voltage panel. These substations are used for effective electrical power distribution in medium voltage to low voltage distribution systems. 

Package Substations are an efficient option to select when a large amount of power is required to feed a site with distributed LV especially when the customer site has access to a suitably rated high voltage power supply. 

Packaged Substation Also called Compact Secondary Substation (CSS) is a type tested and arc tested assembly comprising an enclosure containing medium voltage (MV) switchgear, distribution transformers, low voltage (LV) switchboards, connections and auxiliary equipment to supply LV energy from MV systems. 

A package substation usually consists of an RMU (Ring Main Unit) or a HV switch (High-Voltage switch), cast resin transformer, transformer housing, high-power copper or aluminium busbar which is directly connected to a main LV Switchboard. 

It has Two Types Indoor and Outdoor depends on uses 

Major Advantages 

1. Fully compartmentalized design; Easy to install, operate & require very Less Maintenance; Cost Effective & Space Saving; Reduced Electrical Losses as CSS 

2. Compact and occupies less floor space. Available in both Indoor and Outdoor Versions. Tailed configuration to meet customer requirements. SCADA Compatible ... 

3. Compact and occupies less floor space. Available in both Indoor and Outdoor Versions. Tailed configuration to meet customer requirements. SCADA Compatible ... 

Our company leading supplier of superior quality Porcelain Clad Vacuum Circuit Breakers PCVCB. This equipment is extensively used for backup protection of power Transformers, motors, capacitor banks and power distribution systems. The operation of opening and closing of current carrying contacts and associated arc interruption take place in a vacuum chamber in the breaker which is called vacuum interrupter. The vacuum interrupter consists of a steel arc chamber in the centre symmetrically arranged ceramic insulators. It is such kind of circuit breaker where the arc quenching takes place in vacuum. 

Applications:

• Distribution Networks

• Capacitor switching

• Frequent switching duties

• Arc furnace duty

• Rapid Auto-reclosing etc

A VCB PANEL IS A TYPE OF CIRCUIT BREAKER WHERE THE ARC QUENCHING OCCURS IN VACUUM ENVIRONMENT. VCB TECHNOLOGY IS IDEAL FOR MEDIUM VOLTAGE APPLICATIONS. VACUUM CIRCUIT BREAKER IS RENOWNED TECHNOLOGY TODAY AND IS ALSO KNOWN AS THE MOST RELIABLE CURRENT INTERRUPTION TECHNOLOGY FOR MEDIUM VOLTAGE SWITCHGEARS 

VCB Panel has Two type of Interlocking  system for safe and reliable operation for operator safety

Electrical interlock means configuring the electrical circuit so that the control circuit or the lockout circuit of the mechanical lockout device operates only in the condition that the switchgear can be opened and closed . it is cab be achieved through Numerical Relay and Logic or SCADA Computer based programming.

In Case of MECHANICAL interlock is an arrangement of signals, points and appliances, operated from a panel or lever frame, so interconnected by Mechanical locking or electrical locking or both that their operation must take place in proper sequence to ensure safety”. exist between the functions can be transferred to exist between the levers 

A mechanical interlock is an interlock that is physically connected to another device to prevent unintended actions. 

Electrical VCB Panel has two type of design Indoor as well as outdoor. 

All Routine test/ FAT performed as per IES and IS.

The primary purpose of a relay is to protect the electrical system from too high of a voltage or current, allowing the safe operation of any equipment it connects to. They're commonly found in a variety of applications, from commercial and industrial uses to home and consumer products 

Electromechanical relays are used in motor control circuits, automotives, power systems, etc. Numerical relays are mainly used in generating stations and substations. 

Numerical relays can be programmed and that's what makes them a focal point of interest. When numerical protection relays are being used on a protection device, they provide accurate protection, better reliability, easy troubleshooting, communication, and fault information.