Automatic Transfer Switch Equipment

Automatic Transfer Switching Equipment (ATSE).

Mainly applicable to the rated voltage AC does not exceed 1000V or DC does not exceed 1500V emergency power supply system, interrupted during the conversion of power supply to the load.

Definitio:

1.1 Transfer Switch Equipment (Transfer Switch) TSE

Transfer Switch equipment (Transfer switch)

An appliance that converts one or more load circuits from one power source to another.

1.2 Automatic Transfer Switch Equipment (ATSE) Automatic Transfer Switch Equipment (ATSE)

An appliance consisting of one (or more) transfer switch appliances and other necessary appliances for monitoring the power supply circuit and automatically switching one or more load circuits from one power supply to another.

In the electrical industry, it is referred to as “dual power automatic transfer switch” or “dual power switch”.

Classification :

ATSE can be divided into two levels: PC and CB.

Pc-level ATSE: only complete the function of automatic conversion of dual power supplies, and does not have the function of short-circuit current breaking (only can be connected and carried);

CB ATSE: both to complete the dual power automatic conversion function, but also with the short-circuit current protection (can be switched on and broken) function.

Use the basic principles of category selection“”

5.1 Special attention should be paid to the indicators of selection: rated short-circuit switching and breaking capacity of CB class ATSE.

5.2 In principle, the ATS automatic switch is not used as a short-circuit protection appliance, but only as a power automatic switch.

5.3 The rated current of the ATSE shall be greater than or equal to the setting current of the upper air circuit breaker.

5.4 According to the nature of each power supply and different uses to determine the switching mode: self-feeding self-recovery, self-feeding not self-recovery.

5.5 According to the nature of each power supply, specify the preferred power supply and do not specify the preferred power supply;

And determine the relevant functions such as over and under voltage detection, frequency detection, phase loss detection, communication interface, electrical and mechanical interlock, continuous adjustable delay conversion, can achieve automatic, remote, emergency manual control.

The Function of ATSE

1. One Basic function – Dual power conversion.

In the GB/T14048.11-2008 standard, a transfer switch is defined as an appliance that converts one or more load circuits from one power source to another;

Automatic transfer switchgear (ATSE) is an electrical apparatus consisting of one (or more) transfer switchgear and other necessary electrical apparatus for monitoring the power supply circuit and automatically switching one or more load circuits from one power supply to another power supply.

That is, between the two power supplies, choose a consistent standard to supply power to the load, which is the most basic function of ATSE.

2. Additional Features – Protection features.

According to GB/T14048.11-2008 standard, ATSE is divided into two categories: PC level and CB level, PC level is only to complete the basic function of ATSE – dual power conversion; In addition to the conversion function, the CB ATSE is also given the function of over-current (short circuit) protection.

in fact, the CB ATSE is a product that used to complete the power conversion function with a combination of double circuit breakers.

Environmental condition

1.1 Ambient air temperature: + 40℃ ~ -5℃ (UL is specified in other standards).
1.2 The altitude shall not exceed 2,000m.
1.3 Atmospheric Conditions:
① Humidity. When the maximum temperature is +40 ° C, the relative humidity of the air does not exceed 50%, and higher relative humidity can be allowed at lower temperatures, such as 90% at 20 ° C (daily environment).
② Pollution level: Pollution level 2 (household and similar);
Pollution level 3 (industrial grade).
Industrial electrical appliances are generally suitable for pollution level 3 environment.
1.4 Overvoltage category (installation category) : IV — power level (incoming end), III — distribution level, II — load level (control appliance).
1.5 Electromagnetic environment: Environment A (non-public power grid, with high disturbance sources), environment B (public power grid, without high disturbance sources).