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Specifications
working temperature:
-40℃~+85℃
Current Range:
300A
Voltage - Supply:
11.4V~21V
Sensitivity:
0.5mA/A
Mfr. Part #:
LF 310-S
Key Attributes
Model Number:
LF 310-S
Product Description
Product Overview
The LEM LF 310-S is a closed-loop current transducer designed for the electronic measurement of DC, AC, and pulsed currents with galvanic separation between primary and secondary circuits. It offers bipolar and insulated current measurement up to 500 A, featuring high accuracy and very low offset drift over temperature. This transducer is suitable for various industrial applications, including windmill inverters, test and measurement, substations, AC variable speed drives, static converters, battery-supplied applications, UPS, SMPS, and welding power supplies.
Product Attributes
- Brand: LEM
- Model: LF 310-S
- Origin: Switzerland
- Certifications: IEC 61010-1: 2010, IEC 61800-5-1: 2007, IEC 62109-1: 2010, UL 508: 2013, USR, CNR, CSA C22.2 No. 14-13
- Application Domain: Industrial
- Case Material: V0 (According to UL 94)
- Comparative Tracking Index (CTI): 600
Technical Specifications
| Parameter | Symbol | Unit | Value | Conditions |
|---|---|---|---|---|
| Absolute Maximum Ratings | ||||
| Maximum supply voltage (working) | ±UC max | V | ±21 | (‐40 … 85 °C) |
| Maximum primary conductor temperature | TB max | °C | 100 | |
| Maximum steady state primary current | IP N max | A | 300 | (‐40 … 85 °C) |
| UL 508 Ratings and Assumptions of Certification | ||||
| Primary involved potential | V AC/DC | 1500 | ||
| Ambient operating temperature | °C | 85 | ||
| Primary current | A | 0 ... 300 | ||
| Secondary supply voltage | V DC | 0 ... ±21 | ||
| Secondary current | mA | 0 ... 150 | ||
| Insulation Coordination | ||||
| RMS voltage for AC insulation test, 50 Hz, 1 min | Ud | kV | 3.8 | |
| Impulse withstand voltage 1.2/50 μs | UNi | kV | 10 | According to IEC 61800-5-1 |
| Partial discharge RMS test voltage (qm < 10 pC) | Ut | kV | 1.65 | Test carried out with a non insulated bar and completely filling the primary hole. According to IEC 61800-5-1 |
| Clearance (pri. -sec.) | dCl | mm | 10.5 | Shortest distance through air |
| Creepage distance (pri. -sec.) | dCp | mm | 10.8 | Shortest path along device body |
| Application Example Rated Insulation RMS Voltage | ||||
| Basic insulation | UNm | V | 1000 | According to IEC 61800-5-1 CAT III, PD 2 |
| Reinforced insulation | UNm | V | 600 | According to IEC 61800-5-1 CAT III, PD 2 |
| Environmental and Mechanical Characteristics | ||||
| Ambient operating temperature | TA | °C | ‐40 to 85 | |
| Ambient storage temperature | TA st | °C | ‐50 to 90 | |
| Mass | m | g | 107 | |
| Electrical Data (At TA = 25 °C, ±UC = ±15 V, RM = 1 Ω, unless otherwise noted) | ||||
| Primary nominal RMS current | IP N | A | 300 | * |
| Primary current, measuring range | IP M | A | ‐500 to 500 | * |
| Measuring resistance | RM | Ω | 0 | * Max value of RM is given in figure 1 |
| Secondary nominal RMS current | IS N | A | ‐0.15 to 0.15 | * |
| Resistance of secondary winding | RS | Ω | 22.5 | RS (TA) = RS × (1 + 0.004 × (TA + Δtemp−25)) Estimated temperature increase @IP N is Δtemp = 15 °C |
| Secondary current | IS | A | ‐0.25 to 0.25 | * |
| Number of secondary turns | NS | 2000 | ||
| Nominal sensitivity | SN | mA/A | 0.5 | |
| Supply voltage | ±UC | V | ±11.4 to ±21 | * |
| Current consumption | IC | mA | 33 + IS to 38 + IS | ±UC = ±12 V to ±20 V |
| Offset current, referred to primary | IO | A | ‐0.2 to 0.2 | |
| Temperature variation of IO, referred to primary | IO T A | A | ‐0.2 to 0.2 | * |
| Magnetic offset current, referred to primary | IO M | mA | ±0.2 | After 3 × IP N |
| Sensitivity error | εS | % | ‐0.1 to 0.1 | * |
| Linearity error | εL | % of IP N | ‐0.05 to 0.05 | * |
| Total error | εtot | % of IP N | ‐0.2 to 0.2 | 25 … 85 °C; ‐40 … 85 °C |
| RMS noise current referred to primary | Ino | mA | 35 | 1 Hz to 100 kHz (see figure 4) |
| Delay time to 10 % of the final output value | tD 10 | μs | 0.5 | IP N step 0 to 300 A, 100 A/μs, RM = 10 Ω |
| Delay time to 90 % of the final output value | tD 90 | μs | 0.5 | IP N step 0 to 300 A, 100 A/μs, RM = 10 Ω (see figure 2) |
| Frequency bandwidth | BW | kHz | 100 | RM = 50 Ω; −3 dB |
2411271957_LEM-LF-310-S_C5781275.pdf
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