ComPass Bs 2.0

Directional short-circuit and earth fault indicator with remote switching and freely programmable logic.

The ComPass Bs 2.0 is particularly suitable for use in those substations in a medium voltage network that feature a remote control connection. In addition to the short-circuit and earth fault function, ComPass B 2.0 supplies the collected measured values of current, voltage and power from the station for transmission to the control room. The PT-100 sensor measures the temperature, for example of the transformer or the transformer station. For all measured values limits can be defined, which can also be transmitted to the control room.

The voltage coupling/measurement is done via the capacitive VDS system and/or via resistive (ohmic) voltage sensors. With the simultaneous measurement, the voltage measurement of the VDS system can be automatically calibrated with the resistive voltage measurement. Up to four ComPass B can be connected to one set of resistive voltage sensors.

In addition he offers a control function for switching a load-break switch or circuit-breaker. A free assignment of six binary inputs in combination with a freely programmable logic (PLC functionality) enables the user to define the switching conditions in a flexible manner. Random information, such as the SF6 gas disruption or HV tripped fuse, can be captured via the binary inputs.

Equipment set includes:

  • 1 display unit
  • 3 single-phase current sensors
  • Voltage coupling
  • For remote controlling of a loadbreak switch or circuit-breaker
  • Free assignment of six binary inputs for the collection and transmission of relevant switchgear / station data
  • Freely programmable logic for flexible definition of
    switchgear conditions
  • Clear fault indication and reading on-site: 2 directional arrow LEDs (A, B) and high contrast OLED display
  • High-precision current and voltage measurement (0.5 %)
  • Monitoring of the parameters voltage (V), current (I), load flow direction (A↑ or B↓), power factor (cos φ), power (P, Q, S), energy (E), temperature (T) and frequency (f)
  • Suitable for all types of networks/neutral point treatments
  • Earth fault detection with 6 different earth fault detection methods, also in combination
  • Voltage monitoring with connection to capacitive and resistive (ohmic) sensors in one indicator
  • Limit monitoring: V, I, P, Q, T
  • ComPass Explorer Software: Commissioning and parameterisation via front accessible USB port
  • Your advantage

  • Immediate detection of fault direction
  • Immediate detection of limit violations
  • Measured values available for SCADA and on site
  • Automatic self-calibration of the capacitive voltage inputs, optionally with temperature compensation
  • Remote switching

Technical specifications

Earth fault detection methods

Permanent, earth short-circuit, transient, cos ɸ, sind ɸ, pulse detection

Low-impedance/short-term low-impedance earthed ---
Isolated earthed ---
Resonant earthed ---

LED status display; OLED display, directional arrows red/green

Measured values

Phase currents I1, I2, I3, IE with phase angle

Phase-to-earth voltage V1, V2, V3, VNE and phase-to-phase voltage V12, V23, V31, VNE with phase angle

Load flow direction A↑ or B↓

P, Q, S and cos φ (power factor) (P1,2,3, Q 1,2,3, S 1,2,3, cos φ 1,2,3 via RS485)

Amount of active energy, separate for load flow direction A↑ or B↓, additionally per phase

Operating current I1,2,3, S, P, Q, V12, V23, V31, Ø-vaule adjustable (1 – 60 min), I max. 24 h / 7 days / 365 days, maximum demand indicator Imax. LR , V12max LR, V23max LR, V31max LR, Smax LR, Pmax LR, Qmax LR, Tmin LR, Tmax LR (LR = last reset)

Frequency f

Temperature T

Short-circuit trip current

10 - 2,000 A, self adjustment (200 - 2,000 A)

Response delay short-circuit

20 ms - 60 s

Earth short-circuit trip current

10 - 1,000 A

Response delay earth short-circuit

40 ms - 60 s

Trip current transient method 10 - 500 A
Trip current active current cos ɸ 1 - 200 A
Response delay active current cos ɸ 40 ms - 60 s
Trip current reactive current sin ɸ 1 - 200 A
Response delay reactive current sin ɸ 40 ms - 60 s
Trip current permanent earth fault 1 - 100 %
Response delay permanent earth fault 40 ms - 60 s
Trip current pulse detection 1 - 200 A
Limit overload current 5 - 1,500 A
Limit overvoltage 100 - 200 %
Response delay overload current 40 ms - 60 s
Response delay overvoltage 40 ms - 60 s
Limit undervoltage 1 - 100 %
Response delay undervoltage 40 ms - 60 s
Limit active power 1 - 30,000 kW
Response delay active power 40 ms - 60 s
Trip current reactive power 1 - 30,000 kW
Response delay reactive power 40 ms - 60 s
Limit temperature -40 to +85 °C
Phase currents

±0,5 % (0 - 630 A)

±3 % (630 - 1,500 A)

±5 % (1,500 - 2,000 A)

closed sensor type

Voltages Up to 0.5 % in the range of 80 - 120 %/Vnom (resistive)
Relay contacts 4
Remote contact

Potential-free permanent or momentary contact (>1 s), bistable, NC or NO

Contact capacity: 230 V AC/1 A/62.5 VA max.

220 V DC/1 A/60 W max.

RS485/Modbus-RTU ---
USB port ---
Binary inputs 6
Ethernet interface -
Resistive ---
Capacitive ---
Manual ---
Remote ---
Software via USB ---
Manual reset ---
Remote reset ---
Automatic time reset ---
Reset via interface ---
Reset on current restoration ---
Reset on voltage restoration ---
Reset on restoration of auxiliary supply ---
Reset via Explorer Software ---
Internal power supply

Long-life lithium cell, active flashing time >1000 h, >1000 display activations, shelf life ≥20 years

External auxiliary supply 24 - 230 V AC/DC
CT powered -

Polycarbonate, IP50

Temperature range -30 to +70 °C
Cable diameter -
  1. OLED display: easy to read in all lighting conditions
  2. Displaying the measured values and configuring via the display
  3. Rocker switch for easy handling
  4. Easy parameter setting and commissioning via USB port
  5. Input for PT100
  6. Reverse polarity protected plug-in terminals for quick and easy installation
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