Karakaraka ko da Turanci ko Power Capacitor Bank

Takaitaccen Bankin Capacitor

Bankin capacitor na nufin kungiyar capacitor da ake amfani da shi don gudanar da kuma fitar da energy mai jiragen a cikin system mai jiragen, wanda ke taimaka waɗannan binciken da zai iya duba ingantaccen quality mai jiragen.

Voltage Tolerance na System

Bankin capacitor ya kamata yin aiki daidai har zuwa 110% daga rated peak phase voltage da kuma 120% daga rated RMS phase voltage.

KVAR Rating

Capacitor unit suna da rating KVAR. Standard capacitor unit da ake samu a market, suna da rating KVAR kamar haka. 50 KVAR, 100 KVAR, 150 KVAR, 200 KVAR, 300 KVAR da 400 KVAR. KVAR da za su bar da shi a cikin system mai jiragen ana iya canzawa da formula ta haka.

Temperature Rating na Bankin Capacitor

Wadannan ne suna da biyu daga abubuwan da ke fara heat a bankin capacitor.

Bankin capacitor na outdoor type suna da aiki a fadar wasu inda da sunlight ke fara bayar a cikin capacitor unit. Capacitor na iya fara heat daga furnace na gaba da shi a kan da shi a yi aiki. Production of heat in the capacitor unit is also initiated from the VAR delivering by the unit.

Production of heat in the capacitor unit is also initiated from the VAR delivering by the unit.

Saboda haka, don radiate wannan heat, ya kamata akwai takamfa masu yawan rayuwar. Maximum allowable ambient temperatures a cikin da bankin capacitor ya kamata yin aiki suka baka a cikin tabular form,

Heat Management

Proper ventilation and spacing are necessary to manage heat from external and internal sources to maintain capacitor bank efficiency.

To ensure proper ventilation, there should be adequate spacing between capacitor units. Sometimes, forced airflow can be used to speed up heat dissipation from the bank.

Capacitor Bank Unit or Capacitor Unit

Capacitor bank units or simply called capacitor units are manufactured in either single phase or three phase configuration.

Single Phase Capacitor Unit

Single phase capacitor units are designed either double bushing or single bushing.

Double Bushing Capacitor Unit

Here, the terminal of the both ends of capacitor assembly are come out from the metallic casing of the unit through two bushing. The entire capacitor assembly, this is series parallel combination of required number of capacitive elements is immersed in insulating fluid casing. Hence, there will be an insulated separation between conducting part of the capacitor element assembly go through bushing, there will be no connection between conductor and casing. That is why double bushing capacitor unit is known as dead tank capacitor unit.

Single Bushing Capacitor Unit

In this case casing of the unit is used as second terminal of assembly of capacitor element. Here single bushing is used to terminal one end of the assembly and its other terminal is internally connected to the metallic casing. This is possible because except terminal, all other conducting portion of the capacitor assembly is insulated from the casing.

Three Bushing Capacitor Unit

A three phase capacitor unit has three bushings to terminate 3 phase respectively. There is no neutral terminal in 3 phase capacitor unit.

BIL or Basic Insulation Level of Capacitor Unit

Like other electrical equipments a capacitor bank has also to with stand different voltage conditions, like power frequency over voltages and lightening and switching over voltages.

So Basic Insulation Level must be specified on every capacitor unit rating plate.

Internal Discharge Device

Capacitor units usually have an internal discharge device that quickly reduces residual voltage to a safe level, typically 50 V or less, within a specified time. The discharge period is part of the unit’s rating.

Transient Over Current Rating

Power capacitor may undergo over current situating during switching operation. So the capacitor unit must be rated for allowable short circuit current for specified time period. So, a capacitor unit should be rated with all the above mentioned parameters.

So a power capacitor unit can be rated as follows,

• Nominal system voltage in KV.

• System power frequency in Hz.

• Temperature class with allowable maximum and minimum temperature in oC.

• Rated voltage per unit in KV.

• Rated output in KVAR.

• Rated capacitance in µF.

• Rated current in Amp.

• Rated insulation level (Nominal voltage/Impulse voltage).

• Discharge time/voltage in second/voltage.

• Fusing arrangement either internally fused or externally fused or fuseless.

• Number of bushing, double/single/triple bushing.

• Number of phase. Single phase or three phase.