Current sensors

Description

CR and CRR current transducers (with breaking capacity) are used for measurements and protection in low, medium and high voltage power grids. Excellent electrical parameters, low weight and compact design allow them to replace the traditional core type transformers. CRR transducers with breaking capacity can be installed on the existing cables or insulators.
PCB (Printed circuit board) transducers developed by the Tele & Radio Research Institute feature constant sensitivity at a measured current range.
Due to a wide measurement band and high accuracy, CR and CRR transducers are also used in the power quality analysers.
Fig.2 and 3 shows connection diagram between the current transducer and the bay control unit.
Advantages:

excellent linearity from 0.1 A to 100 kA
wide measuring range - to 20 kHz (Fig. 1)
no overvoltage at secondary circuit open
high overload resistance
non-invasive measurement
wide operating temperature range

Fig. 1. Coupling coefficient S (sensitivity) vs. current frequency f

Technical parameters

Input/output circuit
Maximum operating voltage	250 V
Withstand test voltage	2 kV
Protection level
Case	IP 68
screw connection	IP 00
crimp connection	IP 40
Environmental conditions
Operating temperature	-40°C … +85°C
Storage temperature	-55°C … +90°C

Type	Inner diameter	S (conversion factor) [mV/A]		Measuring range	ID [kA]	Ith [kA]	Rc [Ω]			Ro
Type	[mm]	50 Hz	60 Hz	min ... max	<1h	<1s	-40°C	25°C	85°C	[kΩ]
	54	0,52	0,62	0,2 A ... 300 kA	48	300	330	440	540	≥ 30
	54	0,52	0,62	0,2 A ... 300 kA	48	300	540	550	570	≥ 30
	54	1,05	1,26	0,1 A ... 150 kA	24	150	660	880	1080	≥ 30
	54	1,05	1,26	0,1 A ... 150 kA	24	150	1075	1100	1140	≥ 30
	54	2,10	2,52	50 mA ... 75 kA	12	75	1320	1760	2200	≥ 40
	54	2,10	2,52	50 mA ... 75 kA	12	75	2190	2240	2280	≥ 40
	52	3,18	3,82	30 mA ... 50 kA	8	50	1475	1970	2350	≥ 40
	52	3,18	3,82	30 mA ... 50 kA	8	50	2435	2450	2540	≥ 40
	52	5,16	6,19	20 mA ... 30 kA	5	30	2390	3200	3950	≥ 40
	52	5,16	6,19	20 mA ... 30 kA	5	30	3940	4130	4200	≥ 40
	52	6,34	7,60	15 mA ... 25 kA	4	25	2950	3950	4850	≥ 40
	52	6,34	7,60	15 mA ... 25 kA	4	25	4870	4990	5120	≥ 40
	25	1,08	1,30	0,1 A ... 150 kA	24	150	390	525	650	≥ 30
	25	1,08	1,30	0,1 A ... 150 kA	24	150	705	690	680	≥ 30
	25	2,16	2,50	50 mA ... 75 kA	12	75	785	1050	1295	≥ 30
	25	2,16	2,50	50 mA ... 75 kA	12	75	1325	1360	1370	≥ 30
	78	1,04	1,25	0,1 A ... 150 kA	24	150	865	1155	1480	≥ 30
	78	1,04	1,25	0,1 A ... 150 kA	24	150	1460	1480	1500	≥ 30
	78	2,08	2,50	50 mA ... 75 kA	12	75	1730	2310	2850	≥ 40
	78	2,08	2,50	50 mA ... 75 kA	12	75	2885	2980	3200	≥ 40
	120	1,15	1,38	0,1 A ... 150 kA	24	150	1400	1870	2300	≥ 40
	120	1,15	1,38	0,1 A ... 150 kA	24	150	2280	2350	2415	≥ 40
Transducers with breaking capacity
	52	1,05	1,26	0,1 A ... 150 kA	24	150	660	880	1080	≥ 30
	52	1,05	1,26	0,1 A ... 150 kA	24	150	660	880	1080	≥ 30
	52	3,18	3,82	30 mA ... 50 kA	8	50	1475	1970	2350	≥ 40
	52	3,18	3,82	30 mA ... 50 kA	8	50	2425	2450	2540	≥ 40

S - conversion factor (sensivity) for grids 50Hz or 60Hz

Measuring range – transducer accuracy class is ≤0,5% within this range ≤0,5%

ID - maximum continuous current

Ith - maximum instantaneous current (≤1 s)

Rc – self-resistance of transducer

Ro – recommended load resistance

Installation

The transducers are installed on the cable or insulator and connected to the bay control unit with a shielded twisted pair. The display should be connected to PE from the control unit side only.

Fig. 2. Wiring diagram of CR transducer

Fig. 3. Wiring diagram of CRR transducer

Documantation

Manual:

Catalogue card:

Contact

Tele & Radio Research Institute

str. Ratuszowa 11
03-450 Warsaw
tel.: +48 22 590 73 91
e-mail: energetyka@itr.org.pl
www: itr.org.pl

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