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Dual power automatic transfer switch common sense
Time:2017-07-20 02:44:53    Page view (445)

Dual power automatic transfer switch common sense
Meet the standard IE60947-6-1: 1998 (version 1.2) "low-voltage switchgear and control equipment, the sixth part, automatic transfer switch electrical appliances" GB14048.11-2002 "low-voltage switchgear and control equipment, automatic transfer switch appliances"

Terminology  
Dual power automatic transfer switch
ATSE) is divided into two levels: CB and PC. CB level: ATSE with overcurrent release, its main contact can be switched on and used to break short circuit current. PC level: ATSE capable of turning on and carrying, but not for breaking short-circuit current.

Use Category: AC-33B, suitable for motor mixed load, that contains the motor, the resistance load and 30% incandescent lamp load, connected and broken 6le, cosφ = 0.5. Use category: AC-31B, for a sense of no sense or micro-sensing, connected and breaking current of 1.5le, cosφ = 0.8.

Selection and use of dual power automatic transfer switch

When the mains and generators power conversion, the first consideration should be the generality of the generator to confirm the utility power, the generator automatically start, to be generators power supply indicators to achieve a stable value before the output, and with the device. Select and use ATS by conversion time

1 According to the relevant requirements of the state and the industry, for the dual-power conversion of fire equipment, the conversion time as soon as possible, but consider the current technical conditions of China's power supply, within 30s. When the fire equipment is in operation, if the sudden power failure, will inevitably lead to power conversion, due to the long conversion time will make the fire equipment to stop running and affect the use, it must increase the secondary control to ensure that the fire fighting equipment to continue to work, so the choice of ATS You should give priority to the choice of fast conversion products. 2 for emergency lighting, according to the current design of our time practice, the general use of the city power grid as emergency lighting power supply. In order to meet the needs of the use and security, allowing the use of urban power grid, but the use of ATS as emergency lighting, power failure in the normal power supply, the power conversion time should be met: evacuation lighting ≤ 15s (conditional time to shorten the conversion time) Lighting ≤ 15s (financial goods trading places ≤ 1.5s), safety lighting ≤ 0.5s.

3 When the generator set is used as the emergency lighting power supply, the generator should be started and converted all the time should not be greater than 15s. Selection and use of quadrupole ATS

(1) According to IEC465.1.5, the four-pole switch is used for the switching between the normal power supply and the standby generator.

⑵ with leakage protection of the dual power switch should be used four-pole switch. Two power switch with leakage protection, the lower power switch should be used four-pole switch.

⑶ two different grounding system between the power switch should be used four-pole switch.

⑷ TN-S, TN-C-S system generally do not need to set a four-pole switch. According to the above requirements, in the choice of ATS, should be based on the specific use of functions and requirements to determine whether to use quadruple ATS.

Selection of ATS with Leakage Protection

ATS whether to install the leakage protection, mainly depends on the nature and characteristics of the use of the load, in order to prevent electric shock and to ensure personal safety, the need to install leakage protection, but in the fire load in order to ensure the continuity and reliability of power, The installation of leakage protection, the two contradictory, it is recommended non-fire use of the ATS in the power side and load side should not install the total leakage protection, if the installation must be installed in the conversion after the outlet of their respective branches, fire The ATS power supply side and the load side should not be installed with leakage protection. 

Double power supply automatic transfer switch zero line connection

The company's dual power supply automatic transfer switch zero line has the following connection:

① four-pole dual power automatic transfer switch, zero (N) line separately, each connected to the grid and standby power grid zero (N) line.

② three-pole dual power supply automatic transfer switch zero line has two kinds of connection: one is the common power supply and standby power supply zero (N) line separately. The other is the common power supply and standby power supply connected to the zero line. When the common power supply and backup power supply connected to the zero line, the commonly used power line or standby power line, can not be dual power supply automatic transfer switch on the installation of the remaining current circuit breaker, or in the dual power supply automatic transfer switch When the conversion is made, the residual current operated circuit breaker will trip automatically. (The company's three-pole dual-power factory separately separated from the zero line)

ATSE is generally not allowed to take a large motor or high sense of anti-load conversion, such as large motor load in the operation of the switch, the power phase gap is large, it will be a huge mechanical stress The At the same time by the motor generated by the back electromotive force caused by over-current or even cause fuse blow or circuit breaker tripping. The solution is often used to resist the absorption or load reduction mode, or automatic transfer switch for the delay conversion type. Two sets of moving contacts are added with a delay before switching to avoid the inrush current caused by switching large motor or transformer loads.

Product Certification Introduction

China from May 1, 2002 on the implementation of low-voltage electrical products from the implementation of 3C certification, as ATSE national standard GB / T14048.11-2002 "automatic transfer switch electrical appliances" in October 2002 release, in April 2003 began to implement. Although the automatic transfer switch electrical appliances are included in the first batch of 3C certification directory, because the country standard later than the implementation, so the current ATSE products can only be CQC certification (ie voluntary certification), ATSE has not yet 3C certification. On the market claiming to obtain 3C certificate "ATSE", actually according to GB14048.3-2003 "switch, isolator, disconnector and fuse combination of electrical" standard access to "transfer switch or electric switch" 3C certificate.

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