Thyristor switching modules of the KATKA line have been designed especially for switching power factor correction capacitors in rapid reactive power compensation (up to 20 control interventions in one second) in conjunction with fast power factor controllers of the NOVAR line. They can be also used in other applications where contact-less load switching is required.

Characteristics

• switching device with long life
• high number of connections and disconnections
• up to  29 kVar (KATKA 20) with passive cooling
• up to  87 kVar (KATKA 80) with active cooling
• reduced current and voltage interference with the power system
  (connection and disconnection at near-zero power)
• fast connection and disconnection.

Related Documents

KATKA - Manual [390 Kb]
KATKA - Decl. of Conformity [321 Kb]
NOVAR 1312 - Decl. of Conformity [192.8 Kb]
NOVAR 13xx - Prospectus [1.1 Mb]
NOVAR 314RS - Manual [1.3 Mb]

Applications

• The modules are designed to switch a star- or delta-wired, symmetric or asymmetric, capacitive, resistive or inductive load in a 400/230-volt (440/250-volt) system.
• Load is connected under near-zero voltage (typically 5 volts) across the switching device and disconnected on zero-cross current.
• When using power factor correction capacitors, implementation of detuned power factor correction is highly recommended, otherwise an inductance of at least 12 µH must be wired in series with the switch to reduce speed of current rise. A detuning reactor also expands life of power factor correction capacitors and improves control accuracy.
• The modules incorporate class C overvoltage protection varistors. It is further recommended that a class B, 50 kA, lightning current protection device should be installed in the power lead.
• The control voltage is galvanic isolated from the other circuits.
• The modules have a Power pilot light, to indicate voltage presence, and a Control pilot light to indicate closed circuit condition of the module when control voltage is applied.
• Katka 80 modules include thermostat-controlled fans for forced cooling and thermal protection.

Technical Specifications

	Katka 20-D	Katka 20-T	Katka 80-D	Katka 80-T
nominal operating voltage [V]	400/230±10% 440/250±10%	400/230±10% 440/250±10%	400/230±10% 440/250±10%	400/230±10% 440/250±10%
blocking voltage max.[V]	1600	1600	1600	1600
operating current max. [A]	29	22	87	67
rate of current rise dI/dt max.[A/us]	50	50	50	50
conductor cross-section [mm2]	10	10	25	25
number of switches	2	3	2	3
load character	C/R/L	C/R/L	C/R/L	C/R/L
auxiliary voltage (for fan)[V]	-	-	230±10%	230±10%
fan power (temperature controlled)[VA]	-	-	32	32
aux. conductor cross-section [mm2]	-	-	2,5	2,5
fan threshold temperature [°C]	-	-	60±5	60±5
(*) control DC voltage/current [V / mA]	24 / 10	24 / 10	24 / 10	24 / 10
control conductor cross-section [mm2]	2,5	2,5	2,5	2,5
temp. protection (module switched off)[°C]	-	-	100±5	100±5
overvoltage cath. / pollution degree	3 / II	3 / II	3 / II	3 / II
overvoltage protection	„C“	„C“	„C“	„C“
mechanical protection	IP20	IP20	IP20	IP20
operating temp. (max. load) [°C]	-20 ~ +45	-20 ~ +45	-20 ~ +45	-20 ~ +45
operating temp.(75% load) [°C]	-20 ~ +60	-20 ~ +60	-20 ~ +60	-20 ~ +60
storage temp. [°C]	-40 ~ +100	-40 ~ +100	-40 ~ +100	-40 ~ +100
relative humidity – non condensing [%]	5 ~ 95	5 ~ 95	5 ~ 95	5 ~ 95
dimensions w x h x d [mm]	122x192x117	122x192x117	122x245x157	122x245x157
mass [kg]	2,05	2,15	3,35	3,45

(*) polarity-free, 230 V / 50-60 Hz / 5 mA or 24 V / 50-60 Hz / 10 mA on request

Device Types

KATKA 20-D – a module with natural cooling. It switches phases L1 and L3. Phase L2 passes through. It is designed for star- or delta-connected three-phase loads. Maximal operating current is 29 A.

KATKA 20-T – a module with natural cooling. It switches phases L1, L2, and L3. It is designed for star- or delta-connected three-phase loads. Maximal operating current is 22 A.

KATKA 80-D – a module with forced cooling. It switches phases L1 and L3. Phase L2 passes through. It is designed for delta-connected three-phase loads. Maximal operating current is 87 A.

KATKA 80-T – a module with forced cooling. It switches phases L1, L2, and L3. It is designed for star- or delta-connected three-phase loads. Maximal operating current is 67 A.

Accessories

Discharge resistors

Additional discharge resistors 33 kΩ / 13 W can be ordered separately, qty: 3 pcs./ 1 thyristor module. DR resistors are connected directly to the capacitors terminals.

Auxiliary supply ZP 24

Auxiliary supply 24 V DC is common for all thyristor switches modules connected to the power factor controller. The supply is without case, enclosure level IP-20, placed on mounting rail DIN 35 mm. Following information has to be specified upon order: power of the supply (number of connected thyristor modules and appropriate additional relays, as well as their consumption)