RET650 RET670 ABB Microcomputer based transformer protection device

RET650 RET670 ABB Microcomputer based transformer protection device

RET650 RET670 ABB Microcomputer based transformer protection device

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contact number:13313705507

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The device can continuously measure phase current, current sequence component and zero sequence current. If the device:

With voltage measurement, it can measure zero sequence voltage, phase voltage and voltage sequence component.

According to the standard configuration, the device also provides frequency measurement. You can also calculate the user preset

The maximum current demand within the limit, the overheat load of the protection object, and based on the negative sequence and

Phase imbalance obtained by the ratio of positive sequence current.

In addition, the device also provides three-phase power and electric energy measurement, including power factor.

The measured value can be accessed remotely through the local man-machine interface or through the communication interface of the device

I asked. Local or remote access can also be realized by using the web page human-machine interface.

The device is equipped with a load distribution recorder. The load distribution function stores a certain time interval

Historical load data obtained by cycle (demand interval). These records are:

COMTRADE format.

Power quality

In the en standard, the power quality is defined by the characteristics of the power supply voltage. Instantaneous, short

Time and long-term voltage fluctuation, imbalance and waveform distortion describe power quality

Main characteristics. Distortion monitoring function is used to monitor total current demand distortion and total voltage

Demand distortion.

Power quality monitoring is the basis for power supply companies to provide industrial customers and important customers

Service. The monitoring system can provide relevant system fault information and possible fault causes

Because. It can also be used before customer complaints, equipment misoperation or even equipment damage or failure

The problem condition of the whole system is detected. The power quality problem is not limited to the system

Power supply test of. In fact, most of the power quality problems come from the client's

Electrical equipment. Therefore, power quality monitoring is not only an effective customer service

And can protect the reputation of power supply companies in terms of power quality and service.

The protection device has the following power quality monitoring functions.

? monitoring voltage fluctuations

? monitoring voltage imbalance

? monitoring current harmonics

? monitoring voltage harmonics

The voltage unbalance and voltage fluctuation monitoring function is used to measure the short time in the transmission and distribution network

Voltage fluctuation and monitoring voltage imbalance.

Voltage and current harmonic functions are provided through current waveform distortion and voltage waveform distortion

Methods for monitoring power quality. These two functions provide the total demand distortion (TDD) and

Short term (average 3 seconds) and long-term demand of total harmonic distortion thd.