Chengji Distribution Network Microcomputer Protection and Measurement Device Manufacturer Direct Sales

HPC800 series universal microcomputer protection and measurement deviceBasic Introduction

This device is a microcomputer based product suitable for distribution networks and substations with voltage levels below 110KV, where the neutral point is not grounded, grounded through arc suppression coils, or grounded through small resistors. Provide protection, control, measurement, and monitoring functions for transmission lines and main equipment such as transformers, capacitors, and motors. The device adopts a modular design, which enables it to be conveniently equipped in a single switchgear, and can also be centrally assembled and installed in a distributed manner. Through standardized fieldbus interfaces, multiple nodes can work together to achieve system level management and comprehensive information sharing.

This series of devices adopts a three-level programmable mode of component engineering user and on-site programmable technology (ISP), with PLC functions suitable for power systems. On the basis of replacing traditional methods, it can achieve secondary solutions that cannot be completed. Therefore, this device conforms to the development direction of technology in this field and is an ideal basic equipment for constructing transformer and distribution automation systems.

　　Product Overview and Application Scope

This device is a microcomputer based product suitable for distribution networks and substations with voltage levels below 110KV, where the neutral point is not grounded, grounded through arc suppression coils, or grounded through small resistors. Provide protection, control, measurement, and monitoring functions for transmission lines and main equipment such as transformers, capacitors, and motors. The device adopts a modular design, which enables it to be conveniently equipped in a single switchgear, and can also be centrally assembled and installed in a distributed manner. Through standardized fieldbus interfaces, multiple nodes can work together to achieve system level management and comprehensive information sharing.

This series of devices adopts a three-level programmable mode of component engineering user and on-site programmable technology (ISP), with PLC functions suitable for power systems. On the basis of replacing traditional methods, it can achieve secondary solutions that cannot be completed. Therefore, this device conforms to the development direction of technology in this field and is an ideal basic equipment for constructing transformer and distribution automation systems.

　　Main features and functions

N adopts a high-performance digital signal processor (DSP2812). It has the characteristics of high-speed computing capability and real-time signal processing. The hardware design is refined and equipped with industrial grade components to ensure stable and reliable operation of the device.

N has a unique three-level programming mode of component level, engineering level, and user level, which can provide up to 31 x 7 types of protective components. Component types, parameters, and other parameters can be set on-site/remotely. The switch input and relay output are programmable, making it easy to achieve interlocking/locking and coordination with other devices.

Measurement of high-speed and high-precision AC signals with a sampling frequency of 1600Hz. Multiple FFT calculations of AC signals are completed in milliseconds, and the measured values are digitally corrected to effectively suppress noise and offset.

Powerful vectorization calculation method based on 12 external analog channels; Multiple derived AC signal characteristics can be obtained, including positive, negative, zero sequence, power, etc.

The fault recording with a density of 32 points per cycle is used to record the current and voltage waveforms during faults, and the starting element for fault recording is optional.

N can continuously record 30 events, with full event recording of protection actions including fault time, fault type, and fault peak value, and maintain power failure for easy fault query and analysis.

Surface mounting process, multi-layer board wiring. The main signal circuit is equipped with electromagnetic interference absorbing components, and the device has excellent electromagnetic compatibility characteristics, suitable for harsh electromagnetic environments.

Ethernet, CAN, RS485 communication interfaces.

　　Basic functions and protective component library

The unique protective component library provides core protection functions for the device.

The three-level programming mode of n component level, engineering level, and user level can provide up to 31 × 7 types of protective components.

The type of n component can be set on-site, and the component parameters can be set on-site/remotely.

Each device can simultaneously support any 14 types of protective components coexisting.

Four switch quantity protections/alarms coexist. The switch input and relay output are programmable.

The functions of each protective component are independent of each other and have their own set of values and data records.

　　measurement

The device adopts a newly improved measurement technology and has powerful vectorization operation function. Due to the different digital processing of various analog values, the fundamental, high-frequency, and DC components are effectively separated, eliminating the impact of offset and noise on measurement accuracy. Effectively compensating for the decay of signal measurement components, ensuring long-term operation of the device in harsh environments.

Phase A and C currents

Voltage of phases A, B, and C, line voltage

Positive and negative sequence currents, positive and negative sequence voltages

Zero sequence current

Zero sequence voltage

N grid frequency

N active power

N reactive power

N power factor

　　harmonic

In order to facilitate on-site power grid analysis, the device has the function of measuring and recording high-order harmonics.

The percentage values of the 2nd, 3rd, 5th, and 7th harmonic content of the channel can be observed on the harmonic screen.

　　control

A closing relay. A circuit breaker relay.

Four programmable relays.

A pre alarm signal output relay.

N comes with an independent anti tripping circuit that does not require closing current. (Can be selected for use according to the on-site environment)

N has the ability to monitor circuit disconnections during operation.

　　Discrete input

A 14 channel AC220V/DC220V voltage level switch input isolated by optoelectronic coupling elements.

The software processing has programmable filtering algorithms that eliminate false positives caused by bounce and instantaneous spark interference.

　　Output relay

The n-trip and closing relays can be selected by software and connected to external hardware, and the switch can be activated or deactivated.

The n signal relay can be configured with both hold type and pulse type relay outputs

　　Control Panel

The device is equipped with a dot matrix of 128 × 64 and a high contrast blue background with yellow text graphic LCD display.

N is a fully Chinese menu driven system that can display measurement data, switch status, real-time data, event records, protection settings, and other system parameters.

The high brightness indicator light is used to indicate operation, closing, opening, faults, and alarms.

The n-panel operation adopts a universal 6-key design, which can be used to select screen menus, switch screens, and set data. It is simple, convenient, and easy to master. The panel operation will not have any impact on the system operation, and the constant value modification is password protected.

Monitoring and self diagnosis

The hardware and software in the device are continuously self monitored. Ensuring high reliability of the device and reducing the need for routine inspections. Scope of monitoring and self diagnosis:

Main operating conditions of n circuit/equipment.

N AT and VT disconnection alarm.

Control circuit disconnection alarm.

Alarm for internal abnormalities (data, fixed values, storage components, ports, communication, etc.) in the device.

　　Event and fault records

Always display the last 30 event records, and if a new fault occurs, it will overwrite the faults of * *. These records can provide a detailed description of the faults in the power system and the response of protective devices. The details of the event record include:

Record fault tripping, switch displacement, and external operations.

N time, component number, fault phase sequence, event value, and event type.

N resolution 2ms, power-off hold, record 30 sets.

　　fault recording

This series of devices provides a fault recorder for detecting changes in current and voltage waveforms.

Each protection component in the protection function library can be associated with this fault recorder.

Record the stopping point at the 6th cycle after the fault.