Thyristor Contactor for rapid switching of Capacitors in Low Voltage Grids

Dynamic compensation
Fast switching of capacitors with thyristor contactor

Power grids are connected not only motor´s and other electricity consumers
the continuously over a long period of time have the same electrical power.

In many industrial company and office buildings equipment and systems are installed, which have large changes of in performance at very short intervals.

Typically these are:

• Welders
• Electric resistance welding
• Crane systems
• Presses and punches
• Squaring shear
• Elevator
• Electromagnets
• Data centers
• Wind turbines

 

Arise in many of these plants, due to the rapid change of the load, power supply problems.

A conventional reactive power compensation system switches with contactors turn on
and off .
Because these at an arbitrary time three-phase switches to, are must be the capacitors discharged before, since otherwise a short circuit is switched.
The discharge time is usually longer than a half minute. 
At this time,  can be compensated but thus no short peaks.
This can cause that a large number of fast switching electrical consumers a with contactors power compensation system never switch.

Remedy the dynamic reactive power compensation.

These three phases are not together, but switched with thyristor in the zero crossing of each phase.
It is therefore possible in very short times (in milliseconds) wear-free supply and switch on and off.

The major advantages are clear:

->very short regulate time	-->Real time
->the current zero crossing switching	-->no interference (Transient) by operation
->operation of frequency converters	-->no interference from the automatic power factor correction unit
->continuous desired cos	-->optimum power grid relief
->eliminate Power-line flicker	-->Reduces voltage dip
->Wear and maintenance	-->o wear and of less maintenance

Standard types technical Data

Typ	FE-TS15H2			FE-TS25H2			FE-TS50H2
Mains voltage / V (+/- 10%)	400	440	480	400	440	480	400	440	480
Nominal current / A	22	20	18	36	33	30	72	66	60
Max. continuous current A	26	26	26	50	50	50	100	100	100
i2t (Tvj=125°C, 8,3…10ms) / A2s	1150	1150	8000	3600	3600	8000	15000	15000	10500
VRRM, VDRM / V	1800	1800	2200	1800	1800	2200	1800	1800	2200
Discharge capacitors	Attention: It’s not allowed to use discharge reactors. The used discharge resistors have be dimensioned bigger as in applications with contactors.
Recovery time	Typically 1 period
Switched phases	2, half controlled
Supply voltage	From power circuit (optional: separate supply)
Power consumption supply	max. 9VA
Voltage trigger signal	8 - 30V DC
Consumption trigger signal	2mA at 12V DC
Over temperature protection	N / A			integrated in firing unit
Dimensions w x d x h / mm	appr. 185 x 202 x 188			appr. 200 x 160 x 215
Weight	2,9			4,3
Power losses at nominal current / W	41	37	33	68	61	52	122	111	104
Cooling	AN, air natural
Protection class	IP 20			IP10
Humidity	10% - 95% (without moisture condensation)
Max. altitude	1000m above sea level (operation at higher altitude with reduced power possible)
Max. ambient temperature	+45°C (operation with nominal power) +65°C (operation with reduced power)
Min. ambient temperature	-10°C

 

Other types available:         up to 690 V        (depending on the type)
up to 130 kVar (depending on the type)

 

Caution:

• Never use the discharge reactors.
• The discharge resistors must be adjusted performance power- and proof voltage.

 

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