Surge arrester monitoring & accessories 3EX — surge counters, leakage current meters, ACM condition monitors (3EX5), control spark gap (3EX6), LCM 500
3EX
- Full monitoring range: surge counter 3EX5 030, surge counter with leakage current meter 3EX5 050 (up to 30 mA; 50 mA on special model 3EX5 050-2), sensor and display 3EX5 060 / 3EX5 062, ACM basic 3EX5 080-0, ACM advanced 3EX5 080-1, control spark gap 3EX6 040 / 3EX6 020, portable LCM 500
- Surge counters respond from 200 A (8/20 µs discharge current), withstand the 100 kA high-current impulse (4/10 µs) and resolve 5 impulses per second; passive auxiliary contact for remote metering on the -1 versions
- ACM measures total leakage current and determines its resistive component via 3rd-harmonic analysis with temperature correction and network-harmonic compensation, indicated by traffic-light LEDs — solar powered, no batteries and no galvanic connection to the arrester main circuit, fully silicone-encased with no hollow spaces
- ACM advanced adds daily leakage-current trend registration stored for more than 5 years, a detailed surge-current history with per-impulse energy logging, wireless PC readout via USB wireless module and free Service Tool software, and IEC 61850 / ISCM readiness; an installed ACM basic upgrades without modifying the arrester
- The 3EX5 062 display installs up to 200 m from its 3EX5 060 ground-wire sensor; monitoring devices and accessories (e.g. D91 line clamp, earth terminals) are added to the arrester order code per the HV surge arrester product guide
Arrester condition monitoring and early fault detectionAsset management and remaining-service-life assessmentRemote leakage-current and surge-event supervisionMonitoring of HVDC and FACTS arresters
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Specifications
Main
| Product family | 3EX |
| Product type | Surge arrester monitoring devices and accessories |
| Portfolio | Surge counters, surge counters with leakage current meter, sensor & display, ACM Arrester Condition Monitor (basic/advanced), control spark gap, LCM 500 portable measuring system |
| Purpose | Early fault detection, recording of operating states and remaining service life as input to asset management; arrester service life up to 30 years without maintenance |
| Installation | Integrated into the arrester ground connection (counters, sensors, ACM, control spark gap); LCM 500 portable with clamp-on ammeter |
Surge counters 3EX5 030 / 3EX5 050
| Response sensitivity (8/20 µs) | 200 A |
| High-current impulse withstand (4/10 µs) | 100 kA |
| Resolution | 5 impulses per second |
| Leakage current indication (3EX5 050) | mA meter, peak value / √2, bilinear scale |
| Leakage current measuring range (3EX5 050) | up to 30 mA; up to 50 mA on special model 3EX5 050-2 |
| Remote indication | Optional passive auxiliary contact (3EX5 030-1, 3EX5 050-1) |
Sensor & display 3EX5 060 / 3EX5 062
| Response sensitivity (4/10 µs and 8/20 µs) | 1000 A |
| Response sensitivity (30/60 µs) | 200 A |
| Response sensitivity (rectangular wave) | 100 A |
| Leakage current measuring range | mA meter, up to 20 mA, logarithmic scale |
| Sensor-to-display distance | up to 200 m; connecting leads from 3 m to 30 m per the HV product guide |
| Local measurement | Display provides a connection for local leakage current measurement (e.g. oscilloscope) via accessory measuring lead |
ACM — Arrester Condition Monitor
| Measured variables (basic) | Number of surge current impulses; total leakage current; 3rd harmonic of leakage current with temperature correction and harmonic compensation (3 LEDs) |
| Measured variables (advanced) | Surge current impulse analysis (time stamp, peak value, pulse width, energy content); total leakage current; 3rd-harmonic analysis; arrester energy absorption per impulse |
| Trend registration (advanced) | Daily leakage current measurement at user-defined time, stored for more than 5 years |
| Power supply | Solar — no external power, no batteries, no galvanic connection to the arrester main circuit |
| Data readout (advanced) | Wireless to PC via USB wireless module (3EX5 085 per the monitoring catalog; 3EX5 086 per the 2021 HV product guide) and free Service Tool software |
| System integration | Meets requirements of future ISCM systems (IEC 61850-ready) without hardware replacement; basic version upgradable to advanced without arrester modification |
| Enclosure | Fully encased in silicone with no hollow spaces — moisture penetration impossible |
Order numbers
| Surge counter | 3EX5 030; with auxiliary contact 3EX5 030-1 |
| Surge counter with leakage current meter | 3EX5 050; 3EX5 050-1; 3EX5 050-2 (50 mA) |
| Sensor / display | 3EX5 060 / 3EX5 062 |
| ACM basic / advanced | 3EX5 080-0 / 3EX5 080-1 |
| Control spark gap | 3EX6 040; 3EX6 020 |
| Portable live condition monitoring | LCM 500 — measures the 3rd-harmonic leakage current component without interrupting operation; Siemens-arrester correction data built into the software |
| Upgrade from ACM basic to ACM advanced | 3EX5 081 |
| ACM advanced (USB wireless module) | 3EX5 086 |
| Connecting lead (required for operation) | 3EX5 063- plus a length code (lengths from 3 m to 30 m) |
| Mounting bracket for surge counter | 3EX5 930 |
| Connection cable for monitors | 3EX5 952 |
| Earth lead | 3EX5 955 |
Sensarrester — 24/7 monitoring
| Data access | 24/7 real-time data access to the actual arrester condition and historical data via app or web browser |
| Live alerts | Alert function for critical arrester conditions via email or push notification |
| Historical data | Historical data within a chosen time period |
| Event log | Shows the leakage current curve and the weather conditions at the time of a surge event |
| System integration | Integration into the Sens-family |
Documents & downloads
Catalog A full range of monitoring solutions for surge arresters
Catalog High-voltage surge arresters — Product guide (accessories & monitoring, pp. 109–111)
Catalog High-voltage surge arresters — Product guide, accessories & monitoring devices (current online edition)
Brochure Our portfolio of surge arresters & composite insulators — Sensarrester 24/7 monitoring (current online edition)
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