Huaneng Lancang River Hydropower Co., Ltd. (Party A) and Shenzhen Tafu Automation Technology Co., Ltd. (Party B) have discussed and signed the following agreement regarding the technical characteristics, design, and scheme of the installation equipment, material procurement, installation, and commissioning of the temperature measurement device for the slip ring chamber of Huaneng Manwan Hydropower Plant

• Mandatory regulations and standards to be enforced

GB 5892-2006 "Infrared Emissivity Measurement Method"

GB 50254Code for Construction and Acceptance of Low Voltage Electrical Equipment Installation Engineering

GB 50171-2012 "Code for Construction and Acceptance of Panel, Cabinet and Secondary Circuit Wiring in Electrical Equipment Installation Engineering"

DL/T 5132-2001 "Design Specification for Secondary Wiring of Hydroelectric Power Plants"

DL/T 5081 "Technical Specification for Automation Design of Hydroelectric Power Plants"

Q/HN-1-6300. SCXX-2012 "Technical Specification for Unmanned Duty of Large and Medium sized Hydropower Stations"

GB 13978-2008 "Digital Multimeter"

Q/GDW 468-2010 State Grid Corporation of China Enterprise Standard: Calibration Specification for Infrared Thermometers and Infrared Thermal imagers

• System Design

1. System Architecture

Non contact infrared temperature measurement probes are selected for the temperature measurement components of the collector ring. Each unit is equipped with 4 infrared probes, with two probes installed in the+X and - X directions to measure the negative electrode temperature of the collector ring. Two probes are installed in the+Y and - Y directions to measure the positive electrode temperature of the collector ring. The output signal of the infrared probe is transmitted to the temperature dial digital multimeter of the unit through a shielded cable. The 4-20mA analog signal output by the digital multimeter is sent to the remote display of the monitoring system. The alarm outlet contacts are connected in series and sent to the monitoring system for water machine protection, as shown in the following figure.

1. Installation method of infrared sensor

The infrared sensor is fixed on the metal column shown in the figure using an L-shaped mounting bracket, and can be bolted or directly welded to the metal column for fixation. Install an infrared probe on the positive electrode of the collector ring (upper layer in Figure 2) in both the+Y direction and the opposite - Y direction. Install an infrared probe on the positive electrode of the collector ring (lower layer in Figure 2) in both the+X direction and the opposite - X direction. Arrange and fix the infrared probe lead wires, and connect them to the terminal block installed inside the slip ring chamber.

1. Installation method of on-site display instrument

Install four multifunctional digital displays on the temperature instrument panel of the unit, which are used to connect the four infrared temperature probes installed in the slip ring chamber for local display and signal remote transmission, for on-site inspection by operation and maintenance personnel.

1. Input/output signals

serial number	content	Technical Requirements
1	Sensor working power supply	24V DC， Provided by a digital multimeter
2	Sensor output signal	4～20 mA DC
3	Remote transmission signal of digital display meter	4～20 mA DC
4	Alarm signal	High temperature in the positive electrode+Y direction of the collector ring
		High temperature in the positive electrode Y direction of the collector ring
		High temperature in the negative electrode+X direction of the collector ring
		High temperature in the - X direction of the positive electrode of the collector ring
		The temperature of the positive electrode of the collector ring is too high
		The negative electrode temperature of the collector ring is too high

• Technical parameters of equipment and materials
  1. Performance parameter requirements for infrared temperature probe

serial number	parameter name	requirement
1	environmental level	IP65（NEMA-4)
2	Working environment temperature	0-60℃；
3	working power supply	24V DC；
4	output signal	4-20mA DC；
5	measurement range	0-200℃
6	response time	≤200mS
7	measurement accuracy	± 1% or ± 1.5 ℃, take the highest value
8	repetitiveness	± 0.5% or ± 1.0 ℃, take the highest value
9	emissivity	0.95 or adjustable

1. Performance parameter requirements for digital multimeters

serial number	parameter name	requirement
1	Current input signal	Standard range: 0-1mA、0-10mA、0-20mA、4-20mA、-1/+1mA、-10/+10mA； Adjustable range: -22—22mA。
2	Voltage input signal	Standard range: 0-100mV、0-1V、0-5V、0-10V、0-50V、0-100V、0-200V； ±100mV、±1V、±5V、±10V、±50V、±100V、±200V Adjustable range: -110mV—110 mV； -2 V—11 V； -200V—220V。
3	RTD	PT10、PT100、PT1000； Ni100、Ni1000 2 线或3线； Cu50、Cu53、Cu100；
4	Sensor power supply	Can provide power supply for 2-wire or 3-wire sensors, with a load capacity of 24V 36mA max
5	Current output signal	Standard current output: 0-10mA, 0-20mA, 4-20mA; Adjustable current output: 0-22mA.
6	Voltage output signal	0-10V、0-5V、1-5V；
7	relay output	4-channel SPDT can be set, 2A/250V AC, with power-off contact retention function
8	response time	≤100ms
9	Current output waveform	≤20μA
10	accuracy class	Not less than 0.1%; For RTD signals not less than 0.25%;
11	display	Two rows of LED display, red and green can be set; The main window displays engineering units; Color changes in alarm state;

• System technical indicators

1. Requirements for secondary wiring of cabinets

1. The wiring of the newly installed digital display meter in the cabinet should be neat and beautiful, with clear white markings. The cables introduced from the outside must be clearly marked, arranged neatly and securely tied, and labeled with clear cable tags;
2. Strong and weak current circuits, as well as AC and DC circuits, shall be separated and the same cable shall not be used;
3. Before connecting the control cable, the wire harness should be straightened and tied into a bundle. The spare core wire should be reserved with the longest length and arranged in the bundle to be straightened to the top of the terminal block;
4. The cables of the signal circuit must be properly shielded and grounded;
5. After the wiring is completed, a comprehensive inspection and organization should be carried out to ensure correct wiring and neat appearance.