High-voltage capacitor banks with automatic power control, UKKZ

High-voltage capacitor banks with automatic power control

Adjustable capacitor banks UKRM are meant for power factor correction (cos φ) of electrical plants of industrial companies and distribution networks for voltage of 6-10 kV frequency 50 Hz, with an alternating load. The banks secure maintenance of the set power factor at hours of maximum and minimum loads in a work regime of grid assembly unit as well as exclude increasing regime of reactive power generation (overcompensation).

Automatically adjustable capacitor banks application permits to form a precise balance of reactive power in a grid without operator presence, to reduce current loads at electricity transmission lines, transformers and distribution equipment connecting with reactive power transmission, as well as to stabilize a voltage in electrical system units, what gives a possibility to reduce the charges for energy payment and to connect additional load.

Adjustable capacitor banks of reactive power compensation are meant for operation in closed industrial premises at normal operation conditions. For operation in regions with cold climate at low temperatures the adjustable capacitor banks are supplied to be installed in modules which secure keeping necessary regime of bank operation.

Capacitor Bank description

By the design the banks UKRM-6(10) consist of input cell and capacitor cells (adjustable and non-adjustable), the quantity of which depends on bank’s power. The cells present the assembled weldable metal cabinets, inside of which an apparatus of main and auxiliary circuits is placed. An access to the cells is secured through the doors from facade side.

In the input cell there are current transformers, a disconnector with a drive, control and measuring instruments, devices of relay protection and automatics. At input cell door there are amperemeters, signaling lamps, reactive power controller. Left of the door there are blocking locks for a protection from the access to current-carrying parts when the bank is switched on and a drive of disconnector’s main blades. To the right from the door there is a drive of grounding blades.

Three phase capacitors and fuses are installed in non-adjustable capacitor cells. Three phase capacitors, fuses, current limiting reactors and vacuum contactors are installed in adjustable capacitor cells. Each capacitor has built-in discharge resistors and is protected by installed current-limiting fuses. The fuses has an actuation indicator, and for observing of fuses condition there are peep-holes in capacitor cell doors.

Capacitor banks secure the following:

  • in automatic control regime: automatic maintenance of the set power factor by means of switching on/off of regulation steps;
  • in manual regime: a possibility of manual switching on and off of regulation steps by turns;
  • protection from rated current increase;
  • current indication of static capacitor banks;
  • emergency signaling at protections actuation;
  • voltage protection (max/min);
  • overload protection by means of higher harmonics currents
Type designation Bank power, kvar Constant part power, kvar Regulation step, kvar Overall dimensions, mm* Weight, kg, not more* Normative document
length width height
UKRM56(57)-6,3(10,5)-450-(2×225) U3 450 225 2770 825 1830 905

СТ 1474-1917-АО-4-027-2012
and according to approved technical requirements

UKRM56(57)-6,3(10,5)-450-(3×150) U3 150 915
UKRM56(57)-6,3(10,5)-750-(5×150) U3 750 3670 1235
UKRM56(57)-6,3(10,5)-900-(4×225) U3 900 225 1240
UKRM56(57)-6,3(10,5)-900-(2×450) U3 450 2770 955
UKRM56(57)-6,3(10,5)-900-(3×300) U3 300 3470 1120
UKRM56(57)-6,3(10,5)-900-(450+2×225) U3 450 225 1130
UKRM56(57)-6,3(10,5)-900-(450+3×150) U3 150
UKRM56(57)-6,3(10,5)-1125-(5×225) U3 1125 225 3670 1265
UKRM56(57)-6,3(10,5)-1350-(3×450) U3 1350 450 3470 1145
UKRM56(57)-6,3(10,5)-1350-(450+4×225) U3 450 225 4370 1455
UKRM56(57)-6,3(10,5)-1350-(450+2×450) U3 450 3470 1170
UKRM56(57)-6,3(10,5)-1350-(450+3×300) U3 300 4170 1315
UKRM56(57)-6,3(10,5)-1350-(900+2×225) U3 900 225 3470 1185
UKRM56(57)-6,3(10,5)-1350-(900+3×150) U3 150 1195
UKRM56(57)-6,3(10,5)-1500-(5×300) U3 1500 300 4370 1470
UKRM56(57)-6,3(10,5)-1800-(450+3×450) U3 1800 450 450 4170 1235
UKRM56(57)-6,3(10,5)-1800-(900+3×300) U3 900 300 1380
UKRM56(57)-6,3(10,5)-1800-(900+4×225) U3 225 4370 1520
UKRM56(57)-6,3(10,5)-1800-(900+2×450) U3 450 3470 1235
UKRM56(57)-6,3(10,5)-1800-(1350+2×225) U3 1350 225 4170 1400
UKRM56(57)-6,3(10,5)-1800-(1350+3×150) U3 150 1407
UKRM56(57)-6,3(10,5)-2250-(5×450) U3 2250 450 4370 1545
UKRM56(57)-6,3(10,5)-2250-(900+3×450) U3 900 4170 1425
UKRM56(57)-6,3(10,5)-2250-(1350+4×225) U3 1350 225 5070 1235
UKRM56(57)-6,3(10,5)-2250-(1350+2×450) U3 450 4170 1450
UKRM56(57)-6,3(10,5)-2250-(1350+3×300) U3 300 4870 1600
UKRM56(57)-6,3(10,5)-2250-(1800+2×225) U3 1800 225 4170 1465
UKRM56(57)-6,3(10,5)-2250-(1800+3×150) U3 150 1475
UKRM56(57)-6,3(10,5)-2700-(1350+3×450) U3 2700 1350 450 4870 1640
UKRM56(57)-6,3(10,5)-2700-(1800+2×450) U3 1800 4170 1515
UKRM56(57)-6,3(10,5)-2700-(1800+4×225) U3 225 5070 1800
UKRM56(57)-6,3(10,5)-2700-(1800+3×300) U3 300 4870 1660
UKRM56(57)-6,3(10,5)-2700-(2250+2×225) U3 2250 225 1680
UKRM56(57)-6,3(10,5)-2700-(2250+3×150) U3 150 1690
UKRM56(57)-6,3(10,5)-3150-(1800+3×450) U3 3150 1800 450 1705
UKRM56(57)-6,3(10,5)-3150-(2250+2×450) U3 2250 1730
UKRM56(57)-6,3(10,5)-3150-(2700+2×225) U3 2700 225 1745
UKRM56(57)-6,3(10,5)-3150-(2700+3×150) U3 150 1755
UKRM56(57)-6,3(10,5)-3600-(2700+2×450) U3 3600 450 1795

* As per customer’s request, it is possible to produce banks with different requirements from the table.

Symbol structure of capacitor bankswith automatic power control

UKRM UKRM capacitor bankwith automatic power control;
ХХ- 56- disconnector availability at the input: 56- with disconnector, 57- without disconnector;
ХХ- 10,5- – rated voltage, kV;
ХХХ 3150 – rated power, kVAr;
(ХХХ+ (2700+ a constant part, kVAr;
3х150) 3х150) – quantity х power of compensation steps, pcs. х kVAr;
Х U climatic performance as per GOST 15150-69;
Х 3 location category as per GOST 15150-69.

For instance: UKRM56-10,5-3150 (2700+3х150) U3- capacitor bankwith automatic power control with disconnector availability at the input, rated voltage 10,5 kV, rated power 3150 kVAr, a constant part – 2700 kVAr, 3 steps of adjustment by 150 kVAr, climatic performance and location category as per GOST 15150-69 – U3.

The result of reactive power compensation using capacitor banks is reflected in the following:

  • power factor correction, absence of penalty/fines from energy saving companies;
  • reduction of active power losses during transmission and distribution of electricity;
  • reduction of voltage losses during transmission and distribution of electricity;
  • an increase in carrying capacity of transformers, power transmission lines, an ability to connect an additional load.

If there are nonlinear elements in the load circuit, which are accompanied by non-sinusoidal distortions of voltage or current curve, it is necessary to compensate the reactive power taking into account the harmonic spectrum by means of higher-harmonic filters or filter capacitor banks.
For a climatic performance UHL1, it is possible to place capacitor banks in a warmed block-modular building.