SKJ1、2 Series Low-Voltage Reactive Power Compensation Assemblies

Rated voltage :400, 690V

Rated frequency : 50, 60Hz

Rated compensation capacity of one cubicle:SKJ1:60~ 390kvar;SKJ2:60~300kvar

Sampling current : 1A or 5A

Measuring error: Voltage : + 0.5%, Current: + 1.0%, Reactive power: + 1.0%

Connection of capacitors : "▲","Y" or "Ⅲ"

Working mode: Automatical cycle putting on and cutting off, Coding putting on and cutting off 

Compensation mode: Three phases, separate phase and mixing mode(three phases and single phase mixing compensation)

Dynamic respone time : <100ms, > 10s adjustable

Max allowed current : Continuous service at below 1.3 times of rated current (In)

Control circuit number : 1~12

Switch component:

a. Contactor special for capacitors

b. Contactless switch:

①SCR (silicon controlled rectifier):No inrush current when putting on, fast dynamic compensation;

②Complex switch (consists of SCR and relays): No inrush current when putting on and reducing power loss of SCR.

Series reactor:

a.Without series reactor : Using in the power system where the short circuit capacity and compensation capacity needed are not too big and the harmonics can be negligible.

b.With series reactor : limiting the inrush current (peak over current) caused by switching of switch to 50 In and below (100 In and below as stipulated in GB/T 12747 standard).

c.Series reactor with harmonic suppressed function(Non tuned filter):

①Reactor with 7% reactance ratio(for the system where there are comparatively large fifth harmonic and upper);

②Reactor with 14% reactance ratio(for the system where there are comparatively large third harmonic and upper)

Note : eries with reactor having other reactance retio is avialable by negotiating

d.Series reactor with filtering function(Tuned filter), the 80% ~ 90% each harmonic currents in power system can be filtered.

Note : The configuration of circuits and the reactance ratio of series reactor can be chosen by negotiating