Bachmann|GM260| Grid Measurement Module

Description
The Bachmann GM260 is a high-precision grid measurement module for three-phase electrical networks, supporting two independent three-phase branches with common voltage monitoring.

Features

• Measures current, voltage, frequency, power, power factor, phase angle
• Direct input up to 480 VRMS line-to-line
• True RMS calculation including harmonics up to the 40th
• Two integrated 4-quadrant energy meters
• Compact design for dual three-phase branch measurement
• Fully integrated in Bachmann SolutionCenter

Technical Specifications

Voltage Measurement

• Quantity: 3
• Max rated voltage: 480 VRMS (L-L), 277 VRMS (L-N)
• Measuring range: 70–625 VRMS (L-L), 36–361 VRMS (L-N)
• Accuracy: ≤ ±0.1%
• Overload (continuous): 680 VRMS (L-L), 390 VRMS (L-N)
• Short-term overload: 1039 VRMS (L-L), 600 VRMS (L-N)
• Input impedance: > 2 MΩ

Current Measurement

• Quantity: 6
• CT rated current: 1 ARMS
• Measuring range: 0.01–1.2 ARMS
• Accuracy: ≤ ±0.3%
• Continuous overload: 1.2 ARMS
• Short-term overload: 20 ARMS (1s, 5x, 300s interval)
• Burden: 75 mVA

Frequency Measurement

• Rated: 50/60 Hz
• Range: 45–65 Hz
• Accuracy: ≤ ±0.010 Hz (≤ ±0.005 Hz with filtering)
• Update interval: 20 ms (50Hz), 16.67 ms (60Hz)

Power Measurement

• Types: Active (P), Reactive (Q), Apparent (S), per phase and total
• Accuracy: ≤ ±0.4%
• Calculation standard: DIN 40110-2
• Update interval: 20 ms (50Hz), 16.67 ms (60Hz)

Energy Metering

• Counters: 2 (independent 4Q)
• Accuracy: ≤ ±0.4%
• Resolution: 1 Wh
• Memory: Nonvolatile, update cycle: 1s