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Outdoor low voltage feeder cabinet with the intelligent power factor compensator

A technology of power factor compensation and feeder cabinet, which is applied in the direction of reactive power adjustment/elimination/compensation, reactive power compensation, and adjustment of electric variables, etc. It can solve problems such as contactor burnout, capacitor current zero crossing, capacitor damage, etc., to achieve Guarantee the quality of power supply, improve the level of automation, and save energy

Inactive Publication Date: 2007-10-24
上海中科电气(集团)有限公司
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AI Technical Summary

Problems solved by technology

However, the existing outdoor low-voltage feeder cabinets generally use fixed-capacity compensation capacitors, and contactors are used for switching operations, so the power factor compensation effect is not ideal, and because the switching of capacitors cannot achieve zero current, the contactors are burned. or capacitor damage occurs from time to time

Method used

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  • Outdoor low voltage feeder cabinet with the intelligent power factor compensator
  • Outdoor low voltage feeder cabinet with the intelligent power factor compensator
  • Outdoor low voltage feeder cabinet with the intelligent power factor compensator

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Embodiment Construction

[0010] The present invention will be further described now in conjunction with accompanying drawing.

[0011] From Figure 1, after the power supply transformer enters the cabinet, it supplies power to the user through the knife fuse switch 1, the low-voltage air circuit breaker 2, and the current transformer 3; the input parameters of the sampling voltage from the line and the sampling current signal from the current transformer 3 Analyzer 5, parameter analyzer 5 has data processing function, data display function, data storage function and data communication function, after the data is processed by power parameter analyzer 5, calculate the power factor value and determine whether to perform power factor compensation and compensation The amount is sent to the corresponding intelligent composite switch 6 to send a control signal. The intelligent composite switch 6 integrates a thyristor switch and a relay, and the thyristor drives the relay to control the switching of the compen...

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Abstract

The outdoor low-voltage feedback cabinet with intelligent power factor compensation device comprises: a cabinet body; in the body, a blade switch, a low-voltage air breaker, a current transformer, a power parameter analyzer calculating the sampled voltage from wire and current from transformer to obtain current power factor and necessary compensation value, an intelligent composite switch switching capacitors for optimal compensation, and some group compensation capacitors. This invention ensures high power factor, saves resource, has well reliability and automation level.

Description

technical field [0001] The invention relates to low-voltage power supply equipment, in particular to a small outdoor low-voltage power supply cabinet matched with a power transformer. Background technique [0002] Small outdoor low-voltage feeder cabinets are generally used in conjunction with 100-300KVA outdoor pole-mounted power transformers to provide users with 380V or 220V mains power. Knife fuse switch, low-voltage air circuit breaker, current transformer and compensation capacitor are placed in a cabinet with functions such as rainproof, moisture-proof, fireproof, and small animals. The secondary of the transformer enters the feeder cabinet through a fuse and air circuit breaker The transformer feeds power to the user, and the capacitor compensates the power factor of the line. However, the existing outdoor low-voltage feeder cabinets generally use fixed-capacity compensation capacitors, and contactors are used for switching operations, so the power factor compensati...

Claims

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Application Information

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IPC IPC(8): H02J3/18G05F1/70
CPCY02E40/30
Inventor 姜岳鑫陈天乐张丽晨
Owner 上海中科电气(集团)有限公司
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