AM5SE series microcomputer protection device in the power distribution project of Aurora Gold Mine in Guyana

Abstract: At present, microcomputer protection devices are widely used in power systems, such devices can reasonably monitor the operation status of the power system, and record the location and nature of power system failures in real time, so as to provide reasonable reference information
for the rapid processing of faults.

The AM5SE series microcomputer protection device introduced in this article is applied in foreign projects, which can provide corresponding protection functions for different protection objects of the Aurora Gold Mine Distribution Project in Guyana, which can greatly improve the reliability, safety and quality of substation operation, and is conducive to realizing the comprehensive automation of substations and realizing unmanned or less manned duty
.

Keywords: microcomputer protection; Reliability; Security; Power Supply Quality 1 Overview Zijin Mining Group Co.
, Ltd.
is a large-scale multinational mining group
engaged in copper, gold, zinc, lithium and other metal mineral resources exploration, development, engineering design and technology application research on a global scale.

The company has important mining investment projects in 15 provinces (regions) in China and 13 overseas countries, including Tibet Julong Copper Mine, Heilongjiang Duobaoshan Copper Mine, Fujian Purple Mountain Copper Gold Mine, Xinjiang Aschel Copper Mine, Shanxi Zijin, Guizhou Zijin, Longnan Zijin, etc.
, and Serbia's Chukalu-Peji Copper Mine, Serbian Bor Copper Mine, Congo (Gold) Kamoa Copper Mine, Congo (Gold) Kolwezi Copper Mine, Colombian Buritika Gold Mine
。
By the end of 2021, the company's copper resources reached 62.
77 million tons, of which reserves were 20.
33 million tons; Gold resources amounted to 2,373 tons, of which 792 tons were reserved; Zinc resources reached 9.
618 million tons, of which reserves were 4.
554 million tons
.

The company is accelerating its entry into the field of new energy and new materials, with projects such as Argentine 3Q salt lake lithium mine, Tibet Laguocuo salt lake lithium mine, Hunan Daoxian Xiangyuan hard rock lithium polymetallic mine, etc.
, the overall equivalent of resources exceeds 10 million tons, ranking about the world's major lithium enterprise resource level, and the annual production capacity of the long-term planning equivalent is more than 150,000 tons, laying the foundation
for the company to become an important global lithium producer.

The company ranked 325th in the 2022 Forbes Global 2000 Listed Companies, and ranked (1) in the global gold companies and 7th in the global metal mining companies.
Ranked 407th in the Fortune Global 500 in 2022 and 53rd in the Fortune China 500
.

This project is a 10.
5kV power distribution project for Aurora Gold Mine in Guyana, using KYN28 metal armored handcart vacuum switch cabinet, the inlet cabinet adopts the lower inlet line, and the feeder cabinet adopts the lower outlet
.

The busbar needs to be sleeved with heat shrink casing
.

This project is the cabinet rear sealing plate, the cabinet is installed on the base, so the handcart needs to increase the height of the
base.

The current transformer has an accuracy of 0.
5 steps, and the current transformer of the inlet cabinet is differentiated
.

The protective devices are distributed on the switchgear, and the switchgear is controlled
in situ in the field.

2 Product RequirementsThis time, different microcomputer protection devices
are configured for different objects in the 10.
5kV power distribution project of Aurora Gold Mine in Guyana.

Since the generator set inlet cabinet requires differential protection function, it is necessary to determine the vector of the current at the beginning and end of the generator and detect the fault inside the generator, so the AM5SE-MD motor differential protection device is configured in the inlet cabinet to achieve this function
.

According to the nature of the generator protection, the function of AM5SE-MD motor protection has been adjusted, the start and operation status recognition of the motor in the protection device has been canceled, and the functions of checking the same period, reverse power, phase sequence and so on have been added to meet the actual needs
of the generator set.

The current wiring at the beginning and end of the project is shown in
Figure 1.

If the current at the end and end ends of the site is reversed, you can also change the channel and inlet and outlet direction
of the current inside the AM5SE through the AM5SE internal wiring mapping function.

Figure 1 Generator inlet cabinet part of the primary trunk diagram and current secondary schematic diagram in the station transformer cabinet configuration AM5SE-T transformer protection device, outlet cabinet configuration AM5SE-F line protection device, mother cabinet configuration AM5SE-B with self-projection protection device, these microcomputer protection devices mainly through the following protection functions to achieve real-time monitoring and protection of the equipment operation of the high-voltage cabinet: 3 product program The power distribution project is 10.
5kV Guyana Aurora Gold Mine Project, the high-voltage distribution room is a two-stage busbar, all using a single busbar system, including 33 high-voltage switchgear, the entire distribution room is equipped with a total of 31 protection devices, the above picture scheme is as follows: Figure 2 10.
5kV unit electrical main wiring diagram Figure 3 A system diagram The entire 10.
5kV distribution project is set up with the microcomputer protection model and quantity as follows: 4 Site installation pictures The project microcomputer protection is scattered on the various high-voltage switchgear, The on-site installation is shown in the following figure, and the project has been powered in 2022 and is operating normally
.

Figure 4 Microcomputer protection installation at the site of the Aurora Gold Mine Power Distribution Project in Guyana 5 Conclusion The use of microcomputer protection devices in the power system is an inevitable trend
in the intelligent development of the power grid.

Compared with traditional relays, although the price of microcomputer protection is high, it can greatly improve the reliability, safety and quality of power supply of substation operation, which is conducive to the comprehensive automation of substations, the realization of unmanned or less manned duty, and another way greatly saves costs
.

The power distribution project of Aurora Gold Mine in Guyana, introduced in this article, not only realizes the comprehensive automation of the entire power distribution project by installing corresponding protection devices for each protection object, but also reasonably reduces the labor intensity of the staff and improves the reliability
of the equipment operation.

Reference[1] Ankerui Enterprise Microgrid Design and Application Handbook.
2020.
June Edition[2] Ankerui 35KV and Substation Intelligent Distribution System Design and Product Secondary Principle Atlas.
2020.
October Edition[3] Ankerui User Substation Integrated Automation and O&M Solution.
2021.
11 Edition