Automatic transfer switch cabinet AVR for 2 and 3 inputs rated from 50 to 2000 A

produces switchboard electrical equipment with a voltage of 0.4 kV using Schneider electric components:

• Control cabinets for diesel generator sets
• Automatic transfer switch cabinets – ATS
• Switchgears (RU, RSB, ASU)

We also carry out modernization and repair of switchboard equipment by replacing components or installing additional elements using Schneider electric . Automatic transfer switch (ATS) - a cabinet for automatically switching on backup power to consumers in the event of a power failure from the main power source.

"Breeze Motors" offers you to buy automatic transfer switches (ATS) and automatic transfer switch cabinets (SHAVR) for 2 inputs, as well as for 3 inputs, at the following denomination:

50A, 63A, 100A, 200A, 250A, 400A, 630A, 800A, 1000A, 1250A, 1500A, 2000A, 2500A, 3000A.

Differences between 2-input ATS and 3-input ATS

ATS with 2 inputs switches to a backup power source if the current in the main network disappears. If voltage reappears in the network, the ATS will reconnect.

ATS with 3 inputs is used when there are two network inputs and a backup source (dgu). The ATS switches between two inputs depending on the presence of voltage. The ATS will connect to a backup source if there is no electricity in two inputs at once. If voltage occurs in the main network, the ATS will switch back.

control cabinet is a microprocessor system for monitoring, measuring and controlling the generator set. The control provides a simple user interface with the generator set, digital voltage regulation, digital engine speed control, engine starting and stopping, generator set protection, error storage and emergency stop parameters. As a rule, this is built on the basis of well-proven panels: Compact Mage, Com Ap, Manual Mage . Breeze Motors performs programming, configuration and repair of control cabinets.

The automatic transfer switch cabinet (ATS) performs the function of automatically switching to a backup power source when the voltage of the main source disappears or its parameters go beyond acceptable limits.

Cabinets and drawers AVR up to 1000V

Automatic backup power cabinets and boxes

Options for ATS devices:

On request, ATS can be manufactured with the ability to manually switch between inputs, with overvoltage protection, with quality control of the supply voltage of each input, with limiting the power consumed from the input, ATS with equivalent inputs, with a mimic diagram, with control units ATS021, ATS022, ATS500 , siemens Logo!, ONI, PRO-relay EKF, with partitioning according to form 4a, 4b and many others.

Do you need the cheapest possible solution? A manual transfer device (RVR) may be right for you!

The AVR scheme can be developed FREE of charge for our customers for their specific situation!

Call or write to us and get the best equipment at a great price!

You can see prices for AVR drawers and cabinets in the Price List .

Basic requirements for ATS:

• minimum time for the ATS to operate (no more than 1-2 seconds, ideally a fraction of a second) after turning off the main power source.
• 100% switching on of the ATS when the bus voltage disappears
• single launch of AVR. Repeated starting of the backup source is unacceptable without eliminating the short circuit.

Switchgears (RU, distribution board, ASU) are designed to receive, distribute and account for electricity in three-phase alternating current networks with a frequency of 50 Hz, as well as to protect lines during overloads and short circuits.

AVR cabinet design

The shield has a durable body with a high degree of protection. Inside it is located electrical equipment, including such important elements as:

• starters;
• contactors;
• switches;
• machine guns.

Typically the housing is made of metal or high-strength plastic.

On the outside, the ATS board has light indicators and control devices. Thanks to them, you can evaluate the state of the inputs and, if necessary, use the ability to control the device.

Depending on how the cables are laid, their entry into the cabinet may be located at the top or bottom. The presence of a design feature - a control relay panel - allows you to regulate the input voltage and, if necessary, perform more precise parameter settings.

Control cabinet specifications

Operating conditions for the AVR cabinet:

• in terms of resistance to climatic factors, the SHAVR cabinet according to OST32.146-2000 belongs to class K1;
• in terms of resistance to mechanical loads, the SHAVR cabinet according to OST32.146-2000 belongs to class MS1;

The average service life of an AVR cabinet is at least 20 years.

The electrical insulation resistance of the control circuits among themselves and in relation to the housing is not lower than:

• 100 MOhm – under normal climatic conditions;
• 5 MOhm – at high humidity;

The overall dimensions of the AVR cabinet (height, width, depth, weight) depend on the type and brand of components used and the power of the diesel generator set;

The composition of the ATS components can be changed to suit the specific needs of the Customer, which are specified during the Order process.

Typical scheme:

Kinds

The ATS shield is selected depending on the voltage. There are three types of equipment:

• contactors;
• automatic;
• contactless.

ATS shield on contactors. The peculiarity of this type is the presence of two contactors: one starts power from the main source, the second from the backup one. Switching in the event of an emergency occurs instantly. In this case, the cabinet is blocked if one of the inputs is connected: when powered from the main source, the backup one cannot be started, just as vice versa - when the reserve is turned on, the main one will not start. The advantages of this installation are low cost, low heating and low power.

Automatic switchboard AVR. This cabinet is equipped with a special device that prevents sparks in emergency situations. Because of this, the switching time between the main and emergency sources increases, in contrast to the switchboard on contactors. The automatic shield is considered one of the most durable.

Contactless shield AVR. This cabinet is the most expensive of all due to its design feature: the contact group is in a vacuum, there is no electric arc, therefore, contact burning is minimized. There is also almost no electromagnetic interference. It is advisable to use a non-contact shield for currents above 400 A.

ATS in high-voltage circuits

In electrical networks with a voltage class of more than 1 kV, the implementation of an automatic transfer switch is more complex, but the operating principle of the system remains virtually unchanged. Below, as an example, is a simplified version of the 110.0/10.0 kilovolt step-down transformer circuit.

From the above diagram it can be seen that there are no backup transformers. This suggests that each of the buses (Ш1 and Ш2) is connected to its own supply transformer (T1, T2), each of which can become a backup for a certain time, taking on an additional load. In normal mode, sectional switch CB10 is open. The automatic transfer switch controls the operation of the TP through TN1 Ш and TN2 Ш.

When the power supply to Sh1 stops, the AVR turns off the switch B10T1 and turns on the sectional switch SV10. As a result of this action, both sections operate from the same transformer. When the source is restored, the reserve input system will reconnect the system to its original state.

Expansion of ATS functions

Programmable logic controllers (PLC) are used to control circuit breakers according to selected algorithms.
They already contain an ATS program, which only needs to be configured to implement one or another operating mode. Using a PLC, such as the AC500 controller, makes it possible to simplify electrical circuits, although at first glance the device seems complex. The ATS control can be located on the switchboard door in the form of a set of switches, buttons and indications. The standard solution already includes software. It is installed in the PLC.

Purpose

This device is necessary for only one reason - uninterrupted power supply to all electrical appliances of the end user, regardless of external factors. There is no longer any need to restore supplies with the help of a special team.

The human factor has never been canceled anywhere. Serious substations are always put into operation not from one place, but from two. Moreover, they are divided into sections. All this works in so-called electrical systems of the highest category

This is a necessary precaution so that reserve capacity can be quickly brought online, which the end user may not even know about.

The AVR connection diagram is not as complicated as it might seem at first glance. For example, you want to illuminate an important government facility for special purposes. It is necessary to make sure that when the main source is turned off and another is started, the light does not disappear during this very episode.

Requirements

The main indicators during the operation of the automatic transfer system:

• Fast reaction
• Safe inclusion
• Connection only after checking that there is no short circuit, that is, checking for the presence of blocking elements
• Trigger once
• Manual adjustment of the backup connection threshold, that is, a state of rest with small drawdowns within normal limits
• Connect only if the backup system has sufficient energy.

The simple modern diagrams that we will demonstrate will not be able to fully explain all the tricks and nuances of the operation of the automatic transfer switch. There are many logic circuits that only professionals know about. There is even a mechanical lock in case of the most emergency situations.