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Device Overview

The ENR-WXZ196 series intelligent harmonic elimination device is a newly developed product by our company designed to address the severe accidents of voltage transformer(PT)burnout or even explosion frequently caused by ferromagnetic resonance in neutral ungrounded or resistance/arc suppression coil grounded systems with voltage levels of 66kV,35kV,10kV,6kV,3kV,and below.This device utilizes the 80C196 microcontroller as the core component for detection and control,employs high-power,non-contact components for harmonic elimination,and features an LCD display,signal indicator lights,and a mini printer as the human-machine interface,combined with advanced intelligent software for simpler,more intuitive,and accurate operation.

This device can monitor and display the voltage components of four frequencies(17Hz,25Hz,50Hz,150Hz)in the PT open-delta voltage in real-time.In case of a fault,it can quickly activate and distinguish between overvoltage,ferromagnetic resonance,and single-phase grounding,providing corresponding alarm signals.If it is a resonance fault,it can rapidly initiate harmonic elimination components to suppress the resonance.Additionally,it is equipped with a communication interface to transmit fault information to relevant departments,enabling remote control.

II.Working Principle

The device uses the 80C196 microcontroller as its core to continuously monitor the PT open-delta voltage(i.e.,zero-sequence voltage).Under normal operating conditions,this voltage remains below 30V,and the high-power harmonic elimination components within the device remain in a blocking state,having no impact on the system.When the PT open-delta voltage exceeds 30V,it indicates a system fault.The device then collects data from the voltage transformer's open-delta voltage,analyzes the data,and determines the current fault condition.If it detects ferromagnetic resonance at a certain frequency,the device rapidly activates the harmonic elimination circuit to suppress it.For overvoltage or grounding faults,the device provides corresponding alarm signals.

For various faults,the device can issue separate alarm signals,display and print the faults,automatically record and store relevant fault information,and report it to the host computer.

III.Model Description

IV.Technical Parameters

1.Power Supply:DC/AC220V;

2.Voltage Level:1;

3.Number of Bus Sections:1-4 sections(optional),specify when ordering;

4.Eliminable Resonance Frequencies:17Hz(3rd subharmonic),25Hz(2nd subharmonic),50Hz(power frequency),150Hz(3rd harmonic)and higher frequency ferromagnetic resonances.

5.Terms of Use

1.Ambient temperature:-35°C to 55°C;equipped with a wide-temperature LCD display;

2.Relative humidity≤95%;

3.Atmospheric pressure:80 to 110 kPa;

4.Altitude:below 5 km.

VI.Device Features

1.Fast speed and high precision in data collection,computation,logical judgment,and control output,with strong capabilities in interference resistance,self-checking,and self-recovery;

2.Integrating various domestic technologies and years of field operation experience,it ensures stable performance,safety,and reliability;

3.Equipped with a wide-temperature LCD display and Chinese menu,it offers intuitive operation,clear information display,and easy debugging;

4.The chassis is made of aluminum-magnesium alloy with a brushed film finish,combining aesthetics with strong anti-interference capabilities;

5.Real-time display of voltage components at 4 different frequencies(3rd harmonic/17Hz,2nd harmonic/25Hz,power frequency/50Hz,3rd harmonic/150Hz)for the PT open-delta voltage;

6.Capable of identifying overvoltage,ferromagnetic resonance,and single-phase grounding,and quickly eliminating ferromagnetic resonance;it provides alarm signals for various faults,displaying,printing,and saving relevant information(with 3 pairs of normally open contacts and 1 pair of normally closed contacts);it can also promptly print fault reports(including fault type,fault time,and voltage components at 4 frequencies for PT open-delta voltage);

7.Equipped with a memory function,it can store the latest 20 fault records,which will not be lost after power failure.

8.Equipped with high-power,contactless harmonic elimination components for rapid startup;

9.Simple and convenient debugging and maintenance;suitable for PTs of various voltage levels;

10.Can be configured with communication interfaces to transmit various fault information to relevant departments,suitable for unattended substations.

Appendix

7.Ordering Instructions

(1)Model and quantity of the equipment.

(2)If the usage conditions of the equipment cannot be met or other requirements exist,please specify when placing the order.