Digital SF6 Density With Online Monitoring
HRF-Y63-SZYC
HRF-Y63-JXYC
 
 


1. Purpose：

SF6 high-voltage circuit breakers are widely used in power systems. The reliable operation of SF6 high-voltage circuit breakers has become one of the most critical concerns for the power supply sector. The SF6 gas density relay is used to detect the changes in the SF6 gas density inside the SF6 high-voltage circuit breaker during operation. The quality of its performance directly impacts the operational safety of the SF6 high-voltage circuit breaker.

The HRF-Y63-SZYC Digital Remote SF6 Density Online Monitoring Device (referred to as "pressure gauge") is mainly used for controlling and monitoring the SF6 gas density in sealed containers. It is typically applied to SF6 high-voltage switches, medium-voltage switches, SF6 gas-insulated switchgear (GIS), high-voltage cables, transformers, and current transformers, and is suitable for harsh outdoor environments. The monitor has two or three sets of high-precision action contacts that can transmit alarm, lockout, or overpressure information to the target device terminal when the pressure reaches the preset threshold. Additionally, it has a reliable circuit transmission function, providing an effective platform for real-time data remote reading and information monitoring. The pressure, temperature, and density data are transmitted to the target device (typically a computer terminal), where the data is analyzed and used to control the corresponding terminal actions.

The HRF-Y63-SZYC Digital Remote SF6 Density Online Monitoring Device sends valid data to the target device via current or RS485 signals. The target device can read the density data in real time. The RS485 communication method ensures the integrity and accuracy of the data, providing a solid hardware platform for timely and effective control of the terminal devices.
 
 
2. Features：

1.Stainless steel fully enclosed shell, good waterproof and corrosion resistance, and aesthetic appearance.

2.Gas density signal can be transmitted over long distances.

3.Local display of temperature, pressure, and density.

4.Temperature-sensitive components made from imported materials with high precision and stable compensation performance.

5.Oil-free design, excellent vibration and shock resistance.

6.Uses imported, unique contact device design for truly high-performance components.

7.Electronic remote transmission uses a bus format, reducing the number of connections.

8.Density is transmitted via RS485 signal, suitable for long-distance transmission.



3. Technical Parameters:

1.Measurement Range: Relative Pressure:-0.1—0.25Mpa；/0-0.2Mpa.

2.Accuracy: 0.5 grade (at 20°C); 1.0 grade (at -40°C to 60°C).

3.Enclosure Protection Grade: IP65.

4.Sealing Performance: ≤ 1.0×10-9 Pa·m³/s.

5.Operating Power Supply: DC 24V.

6.Shock Resistance: 500 m/s².

7.Vibration Resistance: 200 m/s².

8.Ambient Temperature: -40 to 60°C, atmospheric pressure 86 to 106 kPa.

9.Relative Humidity: ≤ 95% RH.

10.Communication Protocol: Modbus-RTU, Modbus-TCP.

11.Wiring Instructions: HRF-Y63-SZYC Model Wiring Method.
 
 
 
 
 
 
 
HRF-Y63-SZYC Model Monitor Wiring Diagram

Left Wiring (Alarm Lockout Signal)-Four-Core  
1 Yellow - 2 Blue   Alarm Signal
3 Red - 4 Green     Lockout Signal

Right Wiring (Power Supply and Signal)-Four-Core
1 Yellow  DC 24+ 2 Blue   DC 24-
3 Red   RS 485A  4 Green  RS 485B

12.Wiring Instructions: HRF-Y63-JXYC Model Wiring Method
 
 
 
 
               
Left Wiring: Mechanical Electric Contacts
  1 Yellow-2 Blue   Alarm                               
3 Red-4 Green    Lockout     

Right Wiring: Power Supply and RS485 Output
1 Yellow     24V+ - 2 Blue     24V- 
3 Red    RS485 A - 4 Green RS485 B
 

HRF-Y63-JXYC type monitoring device wiring diagram

 
5. Key Product Technologies:

1.Fully submerged structure design, enhancing temperature sensing.
2.Temperature compensation technology to adjust pressure fluctuations within a wide temperature range.

3.Linear correction and temperature compensation technology for sensors in low humidity environments.

4.Zero-point drift compensation technology for long-term sensor usage and extended calibration periods.

5.High integration and miniaturization technology for SF6 density sensors.

6.Low error rate and anti-interference technology for RS485 communication.


4. EMS, EMC Performance Indicators:

1.Electrostatic Discharge Immunity: According to GB/T 17626.2, Severe Level 4.

2.Radio Frequency Electromagnetic Field Immunity: According to GB/T 17626.3, Severe Level 3.

3.Electrical Fast Transients/Bursts Immunity: According to GB/T 17626.4, Severe Level 4.

4.Surge Immunity: According to GB/T 17626.5, Severe Level 4.

5.Conducted Disturbance Immunity from RF Fields: According to GB/T 17626.6, Severe Level 3.

6.Power Frequency Magnetic Field Immunity: According to GB/T 17626.8, Severe Level 5.

7.Pulsed Magnetic Field Immunity: According to GB/T 17626.9, Severe Level 5.

8.Dampened Oscillatory Magnetic Field Immunity: According to GB/T 17626.10, Severe Level 5.



5. Installation and Usage

1.The remote SF6 density monitor must be installed vertically on the device interface. The explosion-proof cap on the housing should not be opened by unauthorized personnel to avoid affecting the product accuracy due to changes in the internal atmospheric pressure.

2.During installation, use a clean cloth, alcohol, or wet wipe to clean the surface. Apply sealing grease to the O-ring. Tighten the nut at the connection point using a wrench. (Do not move the dial).

3.Gradually adjust the pressure of the monitor to avoid damaging the relay.

4.When the monitor is not in use, the temperature compensation is in a non-compensated equilibrium state. The pointer changes with environmental temperature. When the temperature is higher than 20°C, the pointer is below the 0 mark. When the temperature is below 20°C, the pointer is above the 0 mark. For every 10°C deviation from 20°C, the pointer deviates by approximately 0.02 MPa.After the relay has been filled with an amount of SF6 gas corresponding to its rated pressure value, the relay operates at the relationship values between SF6 gas density and pressure at 20°C.


6. Ordering Instructions:

1.When ordering, please specify the instrument model, rated pressure, alarm pressure, lockout pressure, connection thread, and whether the device is filled with silicon oil.

2.Special customer requirements should be noted in the contract or resolved by agreement.

3.The corresponding rated pressure, alarm pressure, and lockout pressure values will be produced according to the specifications. Common specifications are shown below (customization is available upon request):

7. Acceptance and Storage:

1.Upon receiving the product, the user should check whether the box is intact. If damaged, the cause should be determined immediately.

2.After opening the box, check whether the product is intact and whether the product certificate and manual are complete. Any damage should be reported to the manufacturer immediately.

3.The product should be stored in a dry, ventilated place, with a storage temperature of 0-40°C and relative humidity ≤ 80%. The air should not contain substances that could corrode the product.
 
Digital remote SF6 density relay side appearance diagram 1 (customized according to customer requirements)


 
Schematic diagram 3 on the back of the digital remote SF6 density relay

 
 
 
 
 Figure 1: Digital Remote SF6 Density Monitoring Device Topology
 
 
 
  Figure 2: Remote SF6 Density Monitoring Device Topology
 
(4) SF6 Online Monitoring IED: Deployed in the control room panel, the remote SF6 density monitor aggregates data via an RS485 interface to an 8-port RS-485 hub. The hub uploads the data to the upper management system via the RS485 interface. It analyzes SF6 gas conditions in real-time and triggers event alerts as needed. It displays real-time data, allows historical data queries, summaries, exports, and connects to the power system network or platform as required by actual communication protocols.
 
5.Hub Technical Specifications

(1)Product Overview

HRF-JXQ is an RS-485 bus segmentation hub designed for use in complex electromagnetic environments, with a dual-core, non-stop (continuous operation) design. It addresses the requirements of large RS-485 systems. The RS-485 interface uses optocoupler isolation technology to protect against lightning surges and device failures. Built-in optocouplers and 1500W surge protection circuits provide 2500V isolation voltage, effectively suppressing lightning and electrostatic discharge (ESD). It also prevents lightning strikes and common-ground interference, with external AC24V switch-mode power supply ensuring reliability, suitable for outdoor use.

(2)Product Information

Product Name: 8-port RS-485 Hub
Model: HRF-JXQ
Built-in Power: AC24V
Operation Mode: Asynchronous Half-Duplex
Transmission Medium: Twisted Pair or Shielded Cable
Transmission Rate: 300bps-1152Kbps
Transmission Distance: 0-5 km (115200-300bps)
Dimensions: 155mm × 111mm × 59mm
Installation: Rail Mounting
Operating Environment: -40℃ to 85℃, Humidity 5% to 95%


(3)Interface Terminal Definitions
 
 

 


(4)Product Appearance
 
 
 
 
 
 
 
 
SF6 Remote Transmission Meter Communication Protocol_【V1.0】
 
Baud Rate: 9600bps
Data Protocol: Modbus-RTU
Data Bits: 8
Parity: None
Stop Bits: 1
Each communication is initiated by the master device, and the queried SF6 remote transmission meter returns data. The format is as follows:
 
Read Operation
Send Frame:
Direction: Master -> SF6 Remote Transmission Meter
Format:

 
Return Frame:
Direction: SF6 Remote Transmission Meter -> Master
Format:

Note:
1.For multi-byte data, high byte first, low byte last.
Unused bytes and bits are set to 0 during operation.
2.CRC Checksum: Low byte first, high byte last.
 
Register Mapping Table

Note:
When the temperature returns 0x0325 (850, 85.0℃), it's a normal occurrence that appears briefly during startup.
When the pressure returns 0x2710 (10000, 1.0000 MPa) despite pressure changes, it indicates a fault in the pressure sampling line.
 

6、Station End Display Background Overview:

1.Operating System: Linux, with a human-machine interface (HMI) that uses text, data, tables, graphics, and groupings to display the operational status of production devices clearly and simply, along with alarms. It also provides a safety lock function, allowing operators to adjust the system configuration, modify settings, intervene in operations, and input data.

2.Data Management: It provides various data management options including SQL, Access, dBase, and other ODBC-compliant databases, offering real-time and historical data management, storage, and retrieval capabilities.

3.Data Collection and Processing: It collects analog, digital, pulse, and status signals, performing mathematical and logical operations on the data with a processing accuracy of up to 16 bits.

4.Strong networking capabilities: allows users to build schemes according to their needs, especially suitable for small systems.

5.Industrial Environment Compatibility: Operates in environments ranging from -10℃ to 70℃ with DC 10V to 30V power supply.

6.Advanced and Open: The system follows international standards for hardware, software, and communication, enabling easy interconnection with LANs, WANs, and third-party systems to share network information.

7.Secure Transmission: Uses high-security specifications for data transmission, with both hardware and software products providing secure communication protocols.

8.Processor: High-performance ARM processor, multiple RS232/RS485 serial ports, CAN interface, and 10/100M Ethernet interface.

9.Data Functions: Includes data storage, breakpoint resumption, data conversion, and integrity protection.

10.The time data supports standard ModbusTCP interface to realize communication pre-processing function.

11.Supports power IEC60870-101, 103, 104 protocols, DL/T645, Modbus RTU and other protocols; supports IEC61850 protocol.

12.Hardware Configuration: Uses mainstream configurations such as Intel dual-core processors, 2GB RAM, 2500GB storage, DVD, USB ports, Ethernet, parallel ports, sound card, and 19” LCD monitor.

13.Data Collection: Includes display, alarms, historical data storage, and retrieval functions.

14.Power Supply: DC24V