CONTACTORS TYPE TADN

FIELD DISCHARGE CONTACTORS TYPE TADN FROM 46 TO 6000 AMPS UP TO 1000V

These contactors are made from the combination of the two special executions TDN and TAN, and are fitted as follows:

a) Main contacts, open when the contactor is open, suitable to energize or deenergize the field circuit of generators, motors, synchronous condensers or exciters;
b) Discharge contacts, closed when the contactor is open, suitable to short-circuit, through a proper discharge resistor, the field circuit at the instant preceding the opening of the main contacts. Moreover, when the contactor is closing, the discharge contacts disconnect the field circuit from the discharge resistor, at the instant following the closing of the main contacts. When used for direct-current generators operation, the discharge contacts are adjusted so that they open before the main contacts close and, viceversa, close after the main contacts open;
c) The control circuit is usually of the <<TA>> type with mechanical latch, but can also be of normal type in D.C. as well as in A.C.

The most frequent type of connection, in the case of synchronous generators excited by static exciters, is the one shown in the figured diagram and the characteristics these contactors have to perform are the following.

(Table N°14)

General Characteristics			Characteristics of the Main Contacts (2 poles)					Characteristics of Discharge Contacts (1 pole)
TADN Size	Vn	V'	In	Vcc	I'cc	Icc	ICC0,5	Ind	Iccd	Ichd	ID 15''
TADN Size	[V]	[V]	[A]	[V]	[A]	[A]	[A]	[A]	[A]	[A]	[A]
85	600	700	85	1000	900	800	4000	85	400	2500	1000
125	600	700	125	1000	1200	1000	5000	125	600	3000	1200
190	600	700	190	1000	2000	1500	8000	190	1000	4000	2000
270	750	700	270	1000	3000	2000	15000	270	2500	6000	3000
350	750	700	350	1000	4000	3000	16000	350	3000	7000	3500
550	750	700	550	1000	6000	4000	20000	550	5000	8000	5500
650	750	700	650	1000	7000	5000	20000	650	6000	10000	6500
800	1000	700	800	1000	8000	6000	25000	800	8000	12000	7000
1000	1000	700	1000	1000	10000	8500	25000	1000	10000	15000	8000
1250	1000	700	1250	1000	15000	10000	35000	1250	10000	15000	10000
1600	1000	700	1600	1000	20000	15000	50000	-	-	-	-
2000	1000	700	2000	1000	20000	15000	60000	-	-	-	-
3000	1000	700	3000	1000	20000	15000	80000	-	-	-	-
3200*	1200	1500	3200	2000	15000	15000	100000	-	-	-	-
4000*	1200	1500	4000	2000	15000	15000	100000	-	-	-	-
6000*	1200	1500	6000	2000	15000	15000	100000	-	-	-	-

*Version FSS with double interruption on each main pole
- For higher voltage please ask our technical department
- For TADN size > 1250, use pole R800 or R1000

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