Bender EDS3090/-91/-92/-96 series

Common features: All are equipped with 2m long shielded wires, connected to EDS195P (M) through BNC connectors, with a protection level of IP40, in compliance with CAT III (AC 600V)/CAT IV (AC 300V) safety levels.

AGE185 coupler (optional):

Function: Expand the system voltage range to AC 42-460Hz 500-790V, DC 400-960V, and adapt to high-voltage IT systems;

Parameters: IP30 protection, safety laboratory connector (green and yellow grounding wire 1mm ²), weight ≤ 200g, size 88.5 × 42 × 21mm.

（2） Key technical parameters

1. Measure performance parameters

Measurement Function Adaptation System Core Parameters Measurement Accuracy Frequency Range

Insulation fault location (main circuit) IT system response value: 2-10mA (default 5mA), positioning current: 10-25mA ± 30%/± 2mA AC 42-460Hz

Insulation fault location (control circuit) IT system response value: 0.2-1mA (default 0.5mA), positioning current: 1-2.5mA ± 30%/± 0.2mA AC 42-460Hz

Residual current measurement (PSA30 series clamp) TN/TT system measurement range: 10mA-10A, response value: 10mA-10A (default 100mA) 42-60Hz: ± 5%; 61-1000Hz：±20% AC 42-1000Hz

Residual current measurement (PSA33 series clamp) TN/TT system measurement range: 2mA-2A, response value: 5mA-1A (default 100mA) with the same accuracy as AC 42-1000Hz as above

2. Environmental and safety parameters

Working temperature: -10 ℃~+55 ℃

Climate rating (IEC 60721): Fixed use 3K22, transportation 2K11, long-term storage 1K22

Mechanical grade (IEC 60721): Fixed use 3M11, transportation 2M4, long-term storage 1M12

Insulation coordination: compliant with IEC 60664-1/IEC 60664-3, rated impulse voltage 4kV (main circuit)/0.8kV (control circuit)

Pollution level: Main circuit level 3, control circuit level 2

Working principle and operation process

（1） Core working principle

1. IT system insulation fault location (EDS mode)

Positioning current injection: The PGH18 series injector injects an adjustable positioning current of 1-25mA into the IT system. When the system voltage is greater than 50V, it is driven by the system's own voltage. When the system voltage is less than or equal to 50V or powered off (only PGH186), it is driven by the built-in 50V DC voltage;

Fault location: Measuring the current distribution around the cable with pliers, there is a significant difference in current before and after the fault point. EDS195P (M) locates the insulation damage point by analyzing the strength and direction of the current signal;

Balance adjustment: When the insulation state of the system changes and causes the positioning current to deviate from the set value, the injector and locator cooperate to adjust and maintain current stability, ensuring positioning accuracy.

2. Measurement of residual current in TN/TT system (RCM mode)

Signal acquisition: Measure the clamp surrounding the three-phase four wire/five wire system line and collect the total residual current (vector sum of phase and neutral line currents);

Data processing: EDS195P (M) filters harmonic interference (1-8 harmonics can be disabled), calculates the actual residual current value, and compares it with the set response value;

Alarm triggered: When the residual current exceeds the response value, the ALARM LED flashes and fault data is recorded for subsequent traceability.

（2） Standard Operating Procedure

1. Insulation fault location (IT system, taking EDS3096PG as an example)

Equipment preparation: Check the connection status of EDS195PM, PGH186 injector, PSA3020/3052 measuring pliers, and ensure that the battery is fully charged or connected to USB power supply;

Injector deployment: Connect PGH186 to the IT system through a safety measurement cable, ensure reliable grounding of the PE end, and select the current level (10mA/25mA) based on the system voltage;

Measurement clamp operation: Use the measurement clamp to wrap around each branch cable in sequence, ensuring that the clamp is tightly closed and avoiding interference;

Mode setting: Switch to "EDS mode" on EDS195PM, select the appropriate measurement clamp type (PSA30xx), adjust the response value (default 5mA for the main circuit);

Fault location: Observe the current value of the LCD display screen. The branch where the current suddenly changes or approaches the injected current is the fault branch, gradually narrowing down the range to the specific fault point;

End operation: After positioning is completed, turn off the power supply of the injector and locator, remove the connecting cable, and erase the fault memory.

2. Residual current measurement (TN-S system)

Equipment preparation: Connect the PSA3052 measuring pliers to EDS195PM via BNC cable, turn on the equipment and switch to "RCM mode";

Measurement clamp deployment: Wrap the measurement clamp around the L1, L2, L3, and N wires (excluding the PE wire) of the TN-S system to ensure coverage of all live conductors;

Parameter settings: Select the type of measuring clamp, adjust the response value (default 100mA), enable or disable harmonic indication;

Data reading: After stabilization, press the "HOLD" button to lock the measurement value and record the remaining current data; If the value exceeds the response value and the ALARM LED flashes, it is necessary to investigate the potential leakage of the circuit;