Microcomputer integrated protection device-Fornitore globale

12F, Building 4, Hongtong Dinglan Commercial Center, 388 Huilanya Road, Jianggan District, Hangzhou City

Device Overview
The digital protection and measurement device is suitable for the protection and measurement of interval units with voltage levels of 66 kV and below. It has complete protection, measurement, control, incoming line backup and communication monitoring functions, providing a complete solution for the protection and control of substations, power plants, high and low voltage distribution and plant power systems. It can effectively ensure the safe and stable operation of high and low voltage power grids and plant power systems. It can be combined with other protection and automation equipment to form an automation system through communication interfaces. All devices can be installed in a centralized manner through screen grouping, or can be installed on-site in high and low voltage switchgear.
Specific model classification:

name	Comprehensive protection and measurement device	Motor protection device	Incoming line protection device	Current protection device	Voltage protection device
Application scope	Lines, transformers, busbars, capacitors	High Voltage Motors	Incoming line protection, incoming line backup and self recovery function.	Lines, transformers, busbars	PT protection measurement and control

Function configuration table of microcomputer protection device

function	Function Introduction	Comprehensive protection	motor protection	Incoming line backup self switching protection	Current type protection	Voltage type protection
defend protect work ability	current quick-break protection	√	√	√	√
	Time limited current quick break protection	√		√	√
	Time limited overcurrent protection	√	√	√	√
	(Current protection with low voltage lockout, compound voltage lockout, directional lockout)	√		√
	Inverse time overcurrent protection (general, extraordinary, extreme)	√	√	√
	overload protection	√	√	√	√
	Three phase one shot reclosure	√		√
	Acceleration protection after closing the switch	√		√
	Inter phase charging protection	√		√
	Negative sequence current protection section I	√	√	√	√
	Negative sequence current protection section II	√	√	√	√
	Negative sequence overcurrent and inverse time limit protection		√
	Zero sequence overcurrent protection (small grounding system)	√	√	√	√
	Low voltage protection	√	√	√		√
	Overvoltage protection	√	√	√		√
	Zero sequence voltage protection	√	√	√		√
	Low frequency load shedding protection	√
	Protection for motor starting time too long		√
	Prepare for self investment or self recovery			√
	Heavy gas protection (non electricity 1)	√	√		√
	Ultra high temperature protection	√			√
	Light gas protection (non electricity 2)	√	√		√
	High temperature protection (non electricity 3)	√	√		√
	CT disconnection alarm	√	√	√	√
	PT disconnection alarm	√	√	√		√
telemetry remote signaling	Current, voltage, active power, reactive power, power factor, frequency	√	√	√	√	√
telemetry remote signaling	10 remote signaling channels	√	√	√	√	√
matter piece remember record	Protecting events	√	√	√	√	√
	Alarm event	√	√	√	√	√
	Remote signaling displacement event	√	√	√	√	√
	Operation record event	√	√	√	√	√
	Statistics of accident displacement frequency	√	√	√	√	√
control make	Local/remote opening and closing of switches	√	√	√	√	√
	Remote fixed value modification	√	√	√	√	√
	Remote protection input/output	√	√	√	√	√
jump close position	Jump position and close position indication	√	√	√	√	√
jump close position	Jumping position abnormal alarm	√	√	√	√	√
communication	RS485	√	√	√	√	√

1.2 Device Features
U adopts a fully sealed structure, which has good seismic and dust resistance performance
U miniaturization design, small size, light weight, beautiful appearance, easy installation
U adopts a unique reliability design, with no adjustable components, good device stability, and strong anti-interference ability
Fully Chinese LCD display, clear and easy to understand human-machine interface, and extremely convenient operation and setting
The power supply and control circuit of the U device are both AC/DC dual-use
U has an RS485 bus serial communication port and integrates the MODBUS standard communication protocol
U has event sequence recording function, which can record 64 events without losing data in case of power failure
U has a comprehensive self checking function, complete exception records, event records, and operation records, and all information is maintained in case of power failure
U has a small and delicate appearance, a reasonable structure, and uses high-grade and high-quality components, multi-layer board technology, and SMT technology to make the product have high electrical performance
U has a complete circuit breaker operation circuit
Ultra low power consumption

1.3 Reference Standards
GB6162-85 "Electrical Interference Test for Static Relays and Protection Devices"
GB7261-87 Basic Test Methods for Relays and Relay Protection Devices
GB2887-89 "Technical Conditions for Computer Station Sites"
GB 14258-93 Technical Code for Relay Protection and Safety Automation Equipment
GB 50062-92 "Code for Design of Relay Protection and Automation Devices for Power Equipment"
DL/T 527-2002 "Static Relay Protection Device Inverter Power Supply Technology"
IE870-5-103 "Relay Protection Information Interface Standard"
GB/T15145-94 "General Technical Conditions for Microcomputer Line Protection Devices"
GB/T16435.1-1996 "Remote control equipment and systems and interfaces (electrical characteristics)"
GB/T17626.2 "Electrostatic Discharge Immunity Test"
GB/T17626.3 "Radio frequency electromagnetic field radiation immunity test"
GB/T17626.4 "Electrical Fast Transient Pulse Group Immunity Test"
GB/T17626.5 "Surge Impulse Immunity Test"
GB/T17626.6 "Immunity Test for Conducted Disturbance Induced by Radio Frequency Field"
GB/T17626.8 "Power frequency magnetic field immunity test"
GB/T17626-1998 Electromagnetic Compatibility Testing and Measurement Techniques
GB/T14537-1993 "Shock and collision tests for measuring relays and protective devices"

1.4 Device Structure

1.4.1structure

Adopting standard chassis, full panel, back plug-in structure, embedded and rear wiring installation method, strong and weak electrical isolation greatly enhances the electrical performance of its product.

1.4.2 Plugin

The plugins of this device include CPU plugin, AC and TRIP plugin: among them, the CPU plugin is the core of the device, which is a highly integrated CPU, including the functions of RAM, Flash Memory, AD and other chips; The AC plugin includes power supply and analog signal acquisition; The TRIP plugin includes export and import functions.

1.4.2.1 CPU

1) CPU system
The CPU system consists of microprocessors such as CPU, RAM, ROM, Flash Memory, etc. Including a high-performance 16 bit microprocessor CPU, large capacity ROM, RAM, and Flash Memory, this CPU module has extremely strong data processing and recording capabilities. It can implement various complex fault handling schemes and record a large amount of fault data, with a maximum of 500 recorded events. The protection settings and other operational configuration information are also stored in this memory, and these information will not be lost after the device is powered off.
2) Switching input and output section
The input capacity is divided into internal input and external input. The internal input adopts DC5V input, and the power supply is provided by the device power supply itself. The external input adopts a first stage optocoupler to achieve direct input level of DC220V.
There are three relays used to drive the outlet, two of which are trip relays and one is closing relay.
3) Communication section
This plugin contains an RS485 bus network chip with extremely high communication speed and universal interface. The RS485 network is the main communication interface for this device to access the system.
4) Clock circuit
The plugin is equipped with a hardware clock circuit, which uses a high-precision clock chip and is equipped with a battery to maintain stability in case of power failure.
In addition, the CPU plugin adopts multi-layer printed circuit boards and surface packaging technology, with a compact appearance and structure, greatly improving the reliability and electromagnetic interference resistance of the device.

1.4.2.2 Input, output, and operation circuits

1) External input circuit: There are 10 external input circuits set up, and the device software has taken anti shake measures to avoid false transmission.
2) Logic relay: Logic relays are directly driven by CPU plugins, including trip relays and closing relays.

1.4.2.3 AC/DC Circuit

1) DC inverter power supply: After the DC220V voltage input is passed through an anti-interference filtering circuit, the device uses the inverter principle to output the required DC voltage, and adopts a floating ground method, which is not connected to the shell.
2) Analog signal acquisition: After the external current is isolated and transformed by an isolation transformer, it is input to the analog-to-digital converter through a low-pass filter. The CPU samples and processes the data to form various digital protection relays, and calculates various measurement values in real time. The UA, UB, UC, U0, IA, IB, IC, and I0 terminals are used to protect analog inputs.

1.4.3 Human Computer Dialogue Plugin（MMI）

The main function of the Man Machine Dialogue (MMI) plugin is to display and protect information output by the CPU. The display window on this plugin adopts a four line LCD display with eight Chinese characters per line. The human-machine interface is clear and easy to understand, and a universal keyboard operation method is configured, making human-machine dialogue operation convenient and simple. This plugin is also equipped with light indication information, making the operation information of this device more intuitive.

2 Main technical indicators
2.1 Technical Parameters
1) Rated working voltage AC220, DC220V or DC110V (specify when ordering)
2) Rated technical data
a) AC current: 5A or 1A (specify when ordering)
b) AC voltage: 400V or 100V (specify when ordering)
c) Frequency: 50HZ
3) Power consumption
Working power supply: not exceeding 5W during normal operation;
When performing protective actions, do not exceed 10W.
AC current circuit:< 1VA/phase (IN=5A);
<0.5VA/phase (IN=1A);
AC voltage circuit:< 0.5VA/phase;
4) Accurate scope of work:
electric current: 0.04In～20In
Voltage: 0.4V～1.2Un
Frequency: 0.9Fn～1.1Fn
Time: 0～100s
5) Protecting partial accuracy:
a) Fixed value accuracy: ≤ ±5%；
b) Time accuracy:<± 1% set time+35ms
c) Whole set action time: ≤ 35ms；
d) Frequency accuracy: ≤ 0.01Hz；
6) Accuracy of measurement and control part:
a) Accuracy of communication volume: ≤ ±0.2%；
b) Active and reactive power: ≤ ±0.5%；
7) Switch input:
Input type: Passive
Number of photoelectric isolation inputs: 10
Working voltage: AC220V, DC220V or DC110V
8) Open contact capacity:
a) Export relay
Rated current carrying capacity of contacts: 250Vac/220Vdc, 5A
Output type: Passive (air contact)
b) Signal relay:
Rated current carrying capacity of contacts: 250Vac/220Vdc, 5A
Output type: Passive (air contact)
9) Communication interface
number: one
Electrical characteristics: RS485
Transmission method: Asynchronous
Communication protocol: MODBUS
Address: 1~99
Baud rate: ≤ 1Mbps
Communication medium: twisted pair or fiber optic cable

2.2 Environmental Parameters
2.2.1 Electrical Environment
a) Insulation resistance
Under normal test atmospheric conditions, the insulation resistance value between the live circuit part of the device and the non live metal and shell, as well as between various circuits that are not electrically connected, shall be measured using a megohmmeter with an open circuit voltage of 500V; Under normal atmospheric conditions, the insulation resistance of each circuit should not be less than 100 M Ω.
b) Medium strength
Under normal test atmospheric conditions, the device can withstand a power frequency withstand voltage test with a frequency of 50Hz and a test voltage of 2000V for 1 minute without breakdown, flashover, or damage to components.
c) Impulse voltage
Under normal atmospheric conditions, the DC input circuit, AC input circuit, and signal output contact of the device can withstand a short-term impulse voltage test of (1.2/50) μ s standard lightning wave to ground and between circuits, with an open circuit test voltage of 5kV and no insulation damage.
d) Pulse group interference
The device can withstand the 1MHz and 100kHz pulse group interference tests specified in GB/T14598.13-1998 (idt IEC60255-22-1:1988). The severity level of the test is Level III, with a common mode voltage of 2.5Kv and a differential mode voltage of 1kV.
e) Radiated electromagnetic field interference
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9-1995 (idt IEC60255-22-3:1989), with a test field strength of 10V/m.
f) Electrostatic discharge interference
The device can withstand the severity level IV specified in GB/T14598.14-1998 (idt IEC60255-22:2996), which includes electrostatic discharge interference tests with a contact discharge test voltage of 8kV and an allowable deviation of ± 5%, and an air discharge test voltage of 15kV and an allowable deviation of ± 5%.
g) Fast transient interference
The device is capable of conducting a Level IV rapid transient interference test as specified in GB/T14598.10-1996 (idt IEC60255-22-4:1992), with a test voltage of 4kV and an allowable deviation of ± 10%.

2.2.2 Natural Environment
Working temperature:- 25℃～+55℃
Storage temperature:- 40～+85℃
Humidity: 5-95% RH
2.2.3 Mechanical Environment
a) Working conditions: able to withstand vibration response and impact response with severity level I;
b) Transportation conditions: able to withstand vibration durability, impact durability, and collision with a severity level of I.