TDB ... - Current transformers for cooperation with current relays Type B type

TDB series sensors are able to measure AC and DC currents with a DC-10kHz bandwidth, and 1mA reso-lution.  TDB sensors have an integrated degauss function with DC offset zeroing, which is automatically activated at Power On, or by relay command. This function sets to zero the Dc current measuring errors (DC  offset)  caused  by  terrestral  magnetic  field,  permanent  magnets,  DC  coil  ets...,  temperature  drifts,  mechanical shocks or vibrations. The measuring error of the RMS current (AC+DC) is proportional to the line current and it depends on the geometrical layout of the conductors passing through the sensor hole. It also depend on the distance and the geometrical layout of  the nearby conductors passing outside the sensor hole. The IΔn setting <100mA will be possible only by centering the conductors and with controlled environment conditions (temperature, vibration, EMI).

Technical Data

self estinguishing thermoplastic material	UL 94-V0
max. nominal line current	400Arms Single-phase or 3phase with or without neutral
residual current measure IΔ	Type B – True RMS
measure full range	TDB…3CM: IΔ 1mA÷1,5Aac±2,1Adc TDB…003: IΔ 10mA÷15Aac±21Adc
sensor degauss	500ms voltage pulse
DC offset after degauss	< ±1mAdc
DC offset over temperature	< ±100µAdc/oC (< ±6mAdc@85oC) [-15 oC…+25 oC…+85 oC]
line current error with centred cables	<30μA/A (<3mArms@100A)
sensor connections	4 wires [+Vcc, GND, Vref, Vin]
sensor cable	4 wires 1mm2
bandwidth	DC – 10kHz (-3dB)
shield	high EMI environments
maximum length	10m with shield
safety	IEC 6189-1
maximum primary voltage insulation	720Vac
reference voltage	0,72 kV
test voltage	3kV, 50Hz, 1min.
protection degree	IP20
operating temperature	0...+50°C, U.R./R.H. <90% n.c.
level of insulation	according to IEC 61010-1, IEC 60947-1
storage temperature	-20...+70°C
manufactured according to	IEC/EN 61869-1

Ordering codes

Sensor type	TDB	_ _ _	_ _ _
Size	Ø 28 mm	0 2 8
	Ø 60 mm	0 6 0
	Ø 90 mm	0 9 0
Current	30-300mA		3 CM
	300mA-3A		0 0 3

Dimensions

TDB028	TDB060
TDB090