Page 66 - Current & voltage sensors catalog

NCS125T railway current sensors
For infrastructure only

Technical data

Utilisation
Sensors to measure DC, AC or pulsating currents with
a galvanic insulation between primary and secondary
circuits.

3

Output current shielded cable NCS125T-4AF –
Output voltage shielded cable – NCS125T-4VF
Nominal primary current A 4000 4000
Measuring range A 20000 20000
Not measured overload 1 s/h A peak 80000 80000
Secondary current I S1 at I PN mA ±20 –
mA ±20 –
Secondary current I S2 at I PMAX
Residual current I S10 @ +25 °C μA ≤±250 –
Residual current I S20 @ +25 °C μA ≤±180 –
Thermal drift coefficient (outputs I S1, I S2) μA/°C ≤±4 –
Measuring resistance (outputs I S1, I S2) Ω 0 ... 350 –
Secondary voltage V S1 at I PN V – ±10
V – ±10
Secondary voltage V S2 at I PMAX
Residual voltage V S10 @ +25 °C mV – ≤±100
Residual voltage V S20 @ +25 °C mV – ≤±50
Thermal drift coefficient (outputs V S1, V S2) mV/°C – ≤±2
Measuring resistance (outputs V S1, V S2) Ω – 10000 ... ∞
Rms accuracy 50 Hz (without offset) (1) at I PN @ +25 °C % ≤±1 ≤±1
@ +25 °C % ≤±3 ≤±3
Rms accuracy 50 Hz (without offset) (1) at I PMAX
Gain thermal drift -25 ... +85 °C %/°C ≤0.03 ≤0.03
Gain thermal drift -40 ... -25 °C %/°C ≤0.1 ≤0.1
Linearity (typical) % ±0.5 ±0.5
Delay time (typical) μs ≤3 ≤3
di/dt correctly followed A / μs ≤100 ≤100
Bandwidth @ -1 dB kHz 0 … 10 0 … 10
No load consumption current (I A0+) @ -40 °C mA ≤180 ≤180
No load consumption current (I A0-) mA ≤35 ≤35
Dielectric strength Primary/Secondary 50 Hz, 1 min kV r.m.s. 20 20
Supply voltage ± 25% V DC ±24 ±24
Mass kg 1.4 1.4
Operating temperature °C -40 … +85 -40 … +85
Storage/startup temperature °C -50 … +90 -50 … +90
(1) Maximum current I PN generated: 5000 A r.m.s.

General data Primary connection
– Plastic case and insulating resin are self-extinguishing. Hole for primary conductor.
– Two fixing modes: The temperature of the primary conductor in contact with the case
- Horizontal or vertical with fixing holes in the case moulding must not exceed 100 °C.
- By bar using the intermediate side plate kit (Refer to Accessories
and options on the following page)
– Max tightening torque for M6 screws (side plate mounting): 2 N.m Secondary connection
– Direction of the current: Shielded cable 6 x 2000 mm (cross section 0.5 mm²)
- Output current (I S1 and I S2): A primary current flowing in the
direction of the arrow results in a positive secondary output cur-
rent on terminals I S1 and I S2.
- Output voltage (V S1 and V S2): A primary current flowing in the
direction of the arrow results in a positive secondary output volt-
age on terminals V S1 and V S2.
– Burn-in test in accordance with FPTC 404304 cycle

64 | ABB