Low Voltage Capacitor Cabinet

Low voltage capacitor cabinet For the project, the transformer capacity is KVA, and a set of low-voltage dynamic compensation cabinet is installed on the side of the low-voltage bus of the transformer. The compensation device has a total installed capacity of 320kvar, which is composed of a capacitor cabinet 320kvar. The scheme is designed to install ZRTBBDL low-voltage dynamic reactive power compensation complete set of equipment on the 0.4kV bus, which can solve the problem of reactive power compensation suppressing harmonic more than 5 times to ensure the safe operation of the equipment, and can effectively track and compensate the reactive power of the system. Fast response speed, equipped with 7% reactor, to suppress more than 5 harmonics to ensure the safe operation of the capacitor.

General technical specifications of low voltage reactive power compensation devices GB/T15576-2008

Low-voltage reactive power local compensation device JB/T7115-2011

Technical conditions of reactive power compensation; JB/T9663-2013 "Low-voltage reactive Power automatic compensation Controller"

Gb GB1028 Current Transformer

Gb GB16847 technical requirements for transient characteristics of current transformers for protection

Gb JB/T5356 Current transformer Test Guide

Gb gb11032-2010 "AC non-clearance metal oxide arrester"

GB/T 15291-2015 "Semiconductor Devices -- Part 6 Thyristors"

Scenario

• Voltage grade 400V;
• Transformer capacity ***KVA;
• Total installed capacity of capacitors 320kvar;

Compensation capacity determination:

According to the requirements the installed compensation capacity of low-voltage dynamic reactive power compensation complete set device (ZRTBBDL) is:

QC=KVar

In the setting of each capacitor branch, the fundamental wave capacity that can be emitted is considered comprehensively and the optimal configuration is adopted. The rated voltage of the capacitor is affected by the following aspects:

Static bus voltage level 0.4kV;

• The voltage at both ends of a capacitor increases by connecting a reactor;
• Voltage oscillations boost the voltage at both ends of a capacitor.
• The rated voltage of capacitor branch is 0.48kV.

Using the relationship between output capacity and installation capacity, the installation capacity of the device can be obtained by the following formula:

- Installation capacity (Kvar)

- Output capacity (Kvar)

-- System nominal voltage 0.4 (kV)

--Voltage limit of compensation capacitor bank 0.48 (kV)

The reactance rate of series reactor is 7%, resisting more than 5 harmonics;

• Altitude: not more than 2000 meters
• Maximum monthly average relative humidity: 95%
• Maximum ambient temperature: +45°
• Minimum ambient temperature: -25°
• Average maximum temperature in 24h of hottest month: +30°
• Pollution: IP30

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