HV BM Split Modules 
The HV BM Split Modules use the proven technology of the HV Breakout Modules for fast and precise measurement of internal conductor current, voltage and power even in confined spaces. HV BM Split Modules can be used to perform measurements in HV power cables or also on busbars.
The HV Split Modules are an part component of the Vector CSM E-Mobility Measurement System and serve as the basis for a wide range of measurement applications. They are used where there is not enough space for the installation of the HV Breakout Modules.
For flexible installation of the measurement technology in confined spaces, the HV BM Split modules consist of three components:
The sensor modules (HV SBM - HV Split Breakout Modules) are each connected to an input of the measurement module (HV SAM - HV Split Acquisition Module) using shielded, HV-safe sensor cables. The HV SBM_I/U is equipped with two sensor cables which are connected to the HV SAM.
The "split" design allows the individual HV Split Breakout Modules and the HV Split Acquisition module to be installed where space is available.
Current measurement
Current measurement is performed via shunt modules consisting of a measurement shunt, temperature sensor for automatic temperature compensation and sensor electronics. Thus the shunt-based measurement principle provides precise measurement results.
The shunt modules built into the current sensors are available with different measurement ranges and are selected to suit the measurement task.
The HV cables are connected to the sensor modules via cable glands and ring terminals. In addition, the shunt module is also available as a encapsulated variant (HV SBM_I open) for connection via M8 bores, e.g. on busbars.
For the measurement of small currents (up to ±10 A or ±50 A) on HV+ and HV- cables the HV SBM_I/U is used. This contains the shunt module for current measurement and also the voltage tap. Thus no additional HV SBM is needed.
Voltage tapping
The HV voltage is tapped in the sensor module with connection via ring terminals. Alternatively, a HV-safe sensor cable with open end can be used. The voltage is measured directly in the HV SAM measurement module.
Measurement module HV SAM (HV Split Acquisition Modul)
The HV SAM measurement module performs data acquisition, filtering, sensor supply, temperature compensation and online calculations. It has one signal socket each for the sensor cables of the HV Split Breakout Modules current and voltage. Data is transmitted via the EtherCAT® interface with up to 1 MHz data rate per measurement channel or via a CAN interface as averaged measured values.
In addition, the highly precise calculated RMS values of current and voltage as well as active power, apparent power, reactive power and power factor can be transmitted via CAN.
| Designation | Measurement of | Cable connection | Connection to HV SAM | |
|---|---|---|---|---|
| Inner conductor current Rated current | Nominal voltage Measurement in HV SAM | Sensor cables permanently installed in HV SBM | ||
| HV SBM_I | ±125 to ±1,000 A Four configurable measurement ranges, depending on shunt module used. | Tap HV- | 1 ring terminal per side | 1 sensor cable |
| HV SBM_I open | ±125 to ±1,000 A Four configurable measurement ranges, depending on shunt module used. | Tap HV- | M8 bores | 1 sensor cable |
| HV SBM_I/U | ±10 to ±50 A Four configurable measurement ranges, depending on shunt module used. | Tap HV+ / HV- | Phoenix terminals | 2 sensor cables |
| HV SBM_U | - | Tap HV+ | 1 ring terminal per side | 1 sensor cable |
Click on the corresponding module designation for more information.
With the HV BM Split Modules, currents and voltages can be measured precisely and at high data rates even when there is too little space available for the installation of HV Breakout Modules. This means that measurements can also be carried out in tightly installed HV power cables of test vehicles or within HV components and in busbars. This also greatly simplifies the benchmarking of electric vehicles.
With the measurement data obtained from the HV BM Split modules and the eMobilityAnalyzer from the Vector CSM E-Mobility Measurement System a variety of analyses in real time can be performed: Inverter and powertrain efficiency calculations, e-motor power analysis, harmonic analysis, PWM analysis, ripple analysis and many more.
