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Home ⊙ NEWS ⊙ Hitachi Energy 560CVD11 Multimeter
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Hitachi Energy 560CVD11 Multimeter

From:Hitachi | author:Mr.Chen | Time :2024-08-14 | 180 view: | Share:

560CVD11 Multimeter with FCD, 4U/4I

Can be set to automatically change the screen of the measurement page every 6 seconds and to display each screen once.

CT/VT interface with 3 voltage and 3 current inputs for direct monitoring of 3-wire 85.... .400 VAC

1 A/5 A input for AC transformers

RTU500 serial interface (RS-485)

Display on the front

Applications

The multimeter 560CVD11 is used to measure analog AC input signals from three independent phases with additional inputs for neutral current and voltage.

The module measures the voltage and current per phase directly and generates a series of calculated values.

In addition, the module can detect fault currents and the direction of overcurrent. The modules support configurations with 3 or 4 voltage transformers.

Several versions are available:

Features

The multimeter is a microprocessor-based intelligent electronic device (IED) for measuring current, voltage, power and energy.

Fault current detection and overcurrent indication are also provided.

The current and voltage inputs are connected via transformers only (see Wiring). The modules support configurations with 3 or 4 voltage transformers and 3 or 4 current transformers.

The calculated values are scaled according to the constants programmed by the user for the current and voltage transformers. All values are updated after 200 ms.

Fault current can be measured up to 20 times the rated current.

The current input can withstand 50 times the rated current for 1 second.

The multimeter is equipped with two binary outputs, which are not supported in the RTU500 series configuration.

Energy Values

The combined total value (mid and end readings) is calculated as follows

- Negative Energy

- Positive energy

- Reactive capacitive energy

- Reactive inductive energy

Voltage/Current Distortion (THD)

The 560CVD11 measures the total harmonic distortion (THD) in the voltage and current waveforms of each phase, expressed as a percentage deviation from a pure 50Hz or 60Hz sine wave.

THD is calculated using the Fast Fourier Transform (FFT) algorithm.

- u1. u2. u3. un

- i1. i2. i3. in

Fault current detection

The device has three phases and a neutral for overcurrent detection. The programming of the time-current characteristics is the same for all applications, the

All require the establishment of control variables: trip time delay curve, curve multiplier, pickup current, and reset timing.

Curve references follow ANSI, IEEE and IEC standards (ANSI C37.90. IEEE C37.112-1996. IEC 255-4. BF412).

Directional overcurrent

Detection

Directional overcurrent detection is used to protect multi-source feeders to distinguish between

Directional overcurrent detection is used to protect multi-source feeders to distinguish between faults in different directions. The device has three-phase and neutral overcurrent detection.

It ensures 90° quadrant coordination during phase directional polarization. Therefore, regardless of whether the system is in fault-free or faulted operation.

The selected polarization voltage should be reasonably constant regardless of whether the system is operating without or with faults.

Phase-directed overcurrent

Phase-directed detection requires the determination of whether the current flow in each phase is forward or reverse, depending on the connection of the phase sources, the selected MTA angle, and the voltage and current phases.

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