general outline　　Describe
The HL-731 series protection measurement and control device is a high-performance protection measurement and control device developed to meet the needs of power system development and the market, integrating measurement, control, and communication. Mainly applicable to power systems and other industry users with voltage levels of 35KV and below.

particular　　drop
1. Adopting advanced 32-bit embedded ARM processors
2. Humanized human-machine interface, easy and intuitive operation
3. SOE and self-test report with power-off hold
4. Complete software and hardware self checking, redundant design of secondary watchdog software and hardware, strong anti-interference performance
5. Fully sealed embedded chassis design, large screen with full Chinese character display, can be assembled or directly installed on the switchgear
6. Safe and reliable high-speed fieldbus technology, supporting dual networks, multiple communication interfaces, and multiple communication protocols
7. DCS measurement interface (4-20mA analog output)
8. The device is equipped with a clock synchronization interface to ensure that the device's clock is synchronized with the system

Specification

rated data
DC power supply: 220V ± 20% or 110V ± 20%
AC power supply: 85V~265V
AC voltage: 100/ V，100V
AC current: 5A or 1A
Frequency: 50Hz

Power consumption
DC circuit: ≤ 5W
AC voltage circuit: ＜ 0.5VA/phase (at rated 220V)
AC current circuit: ＜ 0.5VA/phase (rated at 5A)
＜ 0.1VA/phase (rated at 1A)
work environment
Environmental temperature: -10 ℃ to+55 ℃ to ensure normal operation
Relative humidity: 5～95%
Atmospheric pressure: 86～106KPa
thermal stability
2 times the rated current for continuous operation
10 times the rated current can run continuously for 10 seconds
40 times the rated current can run continuously for 1 second
DCS measurement interface output
Output range: 4～20mA
Output accuracy: Level 0.5
Contact capacity
Jumping and closing outlet (normally open contact): 5A, DC 220V (suction)
Signal outlet (normally open contact): 5A, DC 220V (suction)
Switching input: air contact input, conducting current<10mA
measurement accuracy
Voltage and current: Level 1
Frequency: 0.02Hz
P Q、COSΦ： Level 2
Remote signaling resolution:< 2ms
Electricity integration accuracy: Level 2
GPS timing accuracy:<1ms
communication
RS485: The communication speed is adjustable from 9.6 to 115.2 kbps, supports dual network, and the communication medium supports shielded twisted pair cables.
anti-jamming performance
Capable of withstanding the severe level IV electrostatic discharge test specified in GB/T14598.14-1998 (idt IEC255-22-2) standard.
Capable of withstanding the harsh level III electromagnetic field interference test specified in GB/T14598.9-1995 (idt IEC255-22-3) standard.
Capable of withstanding 1MHz pulse group interference test of severity level III specified in GB/T14598.13-1998 (idt IEC255-22-1) standard.
Can withstand the rapid transient interference test of severity level IV specified in GB/T14598.10-1996 (idt IEC255-22-4) standard.
Mechanical properties
Vibration
The device should be able to withstand the vibration durability test with a severity level of 1 as specified in GB/T11287.
The device should be able to withstand the vibration response capability test with a severity level of 1 as specified in GB/T11287.
Impact
The device should be able to withstand the impact durability test with a severity level of 1 as specified in GB/T14537.
The device should be able to withstand the impact response capability test with a severity level of 1 as specified in GB/T14537.
Collision
The device should be able to withstand a collision test with a severity level of 1 as specified in GB/T14537.
Moisture and heat resistance performance
Can withstand the damp heat test specified in Chapter 21 of GB7261.
Mainly following standards
GB/T14598.13-1998 (idt IEC255-22-1) Electrical interference test for measuring relays and protective devices.
First article: 1MHz pulse group interference test
GB/T14598.14-1998 (idt IEC255-22-2) Electrical interference test for measuring relays and protective devices.
Article 2: Electrostatic Discharge Test
GB/T14598.9-1995 (idt IEC255-22-3) Electrical interference test for measuring relays and protective devices.
Article 3: Radiated Electromagnetic Field Interference Test
GB/T14598.10-1996 (idt IEC255-22-4) Electrical interference test for measuring relays and protective devices.
Article 4: Fast Transient Interference Test
Other indicators meet the general technical requirements for static relay protection and safety automatic devices (DL478-92).

1. Basic configuration

The HL-731 incoming backup self switching device (hereinafter referred to as the device) is suitable for the backup power supply self switching and measurement and control of incoming switches. The system schematic diagram is as follows. During normal operation, a busbar has two incoming lines, one in operation and one standby.

Protection function

1.　　 Bidirectional incoming line self switching function

2.　　 PT disconnection detection of busbar

3.　　 PT disconnection detection for two incoming lines

4.　　 Control circuit disconnection detection for two switches

Measurement and control function

1.　　 14 channel remote signal input acquisition, device remote signal displacement, accident remote signal

2.　　 2-channel pulse input

communication

　　 The communication card of the device supports multiple communication interfaces, and users can choose high-speed RS485 according to their engineering needs CAN。

Working principle

The device introduces bus voltage and incoming line voltage for voltage and non voltage discrimination. The bus voltage setting, bus non voltage setting, incoming line voltage setting, and incoming line non voltage setting can all be independently adjusted.

To prevent the misoperation of the incoming switch caused by PT three-phase disconnection, each incoming switch introduces a phase current, and the no current setting can be adjusted.

The device introduces 1DL and 2DL switch position contacts as system operation mode discrimination, automatic charging, and automatic switching mode selection.