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Principle and installation attention of electric fire monitoring system with residual current

time:2017-09-06 16:11:26source:Ziqi compressorauthor: 赵疆昆Clicks: 0
Core Tip: 1 Electrical fire prevention In order to prevent and reduce electrical fires, should be online monitoring of 220 / 380V power supply line insulation status, you can use the electrical fire monitoring system for leakage detection

First,the industry user electricity characteristics analysis

The "photovoltaic industry" is based on the application of silicon materials for the development of the industry chain, including the production of high-purity polysilicon raw materials, solar cell production, solar cell module manufacturing, manufacturing related equipment. Photovoltaic power generation is considered as the most promising renewable energy in the future. At present, China's PV industry cluster is initially formed, and a nationwide and even global PV production base has been set up in Jiangsu and other provinces.

The industry for large-scale production generally use 110kV or 220kV power supply (and for the same dual-way operation), electricity load, production nature of three shifts for continuous operation, and is not affected by time, season, climate.

Second, the main user of the industry equipment and peak load capacity analysis

1, The main power equipment in the PV industry is the ingot furnace, crucible, growth furnace, cutting equipment, etc. The single crystal furnace avoids the peak response time of 72 hours. The slicing machine and the cross machine avoid peak response time by 5 ~ 6 hours. The industry has a large electricity load and continuity and important (high risk), not suitable for participation in emergency peak, you can arrange to participate in the phase shift peak.

2. Emergency peak shifting When power is cut off, auxiliary equipment such as office lighting, computer facsimile, factory lighting and other non-productive electrical equipment and certain purification plant can only be quickly deactivated without endangering the safety. Therefore, it is urgent Poor peak capacity is weak.

3, the industry users staggered peak stage can be arranged by the central maintenance, shift holiday, stop production lines and other ways.

Third, the industry users involved in the peak load power technology solutions

(A) gap level IV level participation program

1. Staggered peaks:

The implementation of non-productive load-saving electricity management, such as: office lighting, computer fax printing and other office appliances, split and central air conditioning, canteen steamed rice truck, blower, factory road lighting, etc., in each time to reduce or stop .

2 emergency peak:

Immediately disable unproductive loads such as central air conditioners that can be operated intermittently.

(B) Gap level III participation program

1. Staggered peaks:

The implementation of non-productive load-saving electricity management, such as: office lighting, computer fax printing and other office appliances, split and central air conditioning, canteen steamed rice truck, blower, factory road lighting, etc., in each time to reduce or stop . In the early peak, lumbar peak, late peak water pump, slicer, profiler and other non-continuous production load, accounting for about 40% of the total load.

2 emergency peak:

Immediate discontinuation of unproductive loads such as air-conditioning systems, office and lighting systems that can be operated intermittently.

(C) Gap level II level participation program

1. Staggered peaks:

The use of centralized production, centralized maintenance approach, ahead of schedule or over the completion of the planned production tasks, the remaining work day arrangements for staff rotation or equipment maintenance to meet the requirements of avoiding peaks.

2 emergency peak:

Immediately disable non-productive load such as air-conditioning system, office and lighting system, electric cooker, factory lighting and other intermittent operation.

(D) Gap level I-level participation in the program

1. Staggered peaks:

The centralized production and centralized overhaul will be used to complete the planned production tasks in advance or over. The rest of the working days will be arranged for workers to take turns, equipment maintenance or partial suspension of production lines to meet the requirements of avoiding peaks.

2 emergency peak:

Immediately disable non-productive load such as air-conditioning system, office and lighting system, electric cooker, factory lighting and other intermittent operation.

Fourth, the industry users participate in the peak load risk and precautions

The industry is a continuous manufacturing industry that is a high-risk industry where a sudden power outage can result in equipment damage and casualties. For peak load, you must inform the industry 72 hours in advance to stop production line stop production or arrange for overhaul and pay attention to prevent the following accidents:

1. Sudden power loss during the production of polysilicon, especially the transport of toxic and harmful gases and combustible gas equipment to stop working, resulting in a system of positive pressure, resulting in emissions to the environment, causing great pollution, or even an explosion, in a wide range Injury or fatal to personnel within, serious consequences.

2.Circulating cooling water pump is a cooling device used to protect the equipment in the chemical production process. If the auxiliary cooling system stops working after the power is lost, it will also damage the main body of the furnace and cause equipment accidents, which will directly affect the recovery cycle and cause heavy losses, Serious fire and personal injury may result.

3. The main function of the process fan is to transport the material, air and cooling required for the chemical reaction to the production line. In the event of a power failure, the high proportion of other materials in the reaction device may result in the scrap of the batch product or damage to the equipment or even cause personal injury.

4. Fire pump is a flammable and explosive chemical companies in the production process to maintain appropriate pressure and normal operation of security facilities, such as loss of power to stop running to face a fire accident can not be timely rescue, resulting in loss of property casualties.

Therefore, the industry should not be involved in peak load forced pull or remote control equipment with limited power, should guide enterprises to develop effective early emergency plan, take the initiative to cooperate with the implementation of peak shifting, to prevent the occurrence of a vicious accident, the loss to a minimum.

Fifth, the smart power monitoring functions and applications

Hareon Photovoltaic Technology Co., Ltd. is China's largest producer of crystalline silicon solar cells Since its establishment in 2004, Hareon photovoltaic based on the industry, the rapid development in the photovoltaic field specializing in the upstream single crystal rod / polycrystalline cast Ingot, cut square, silicon cutting and other aspects of production. Hairun PV owns Jiangyin Hairun Solar Power Co., Ltd., Otreswer Energy (Taicang) Co., Ltd., Hefei Hairun Photovoltaic Technology Co., Ltd. and Siyang Ruitai Photovoltaic Materials Co., Ltd. four wholly-owned subsidiaries and a controlling stake Company Jiangyin Xinhui Solar Energy Co., Ltd., specializing in the production of solar cells and solar modules, thus Hareon photovoltaic has from silicon rods (silicon ingots) → silicon → solar cells → solar modules more complete production of the PV industry chain . Hairun PV uses a vertically integrated production and service model. Hairun photovoltaic customers and suppliers around the world, and with customers to establish a good business relationship. This stable and continuous supply relationship, so that the products of Hairun photovoltaic for the world clean energy made a significant contribution to the cause.

This project is the power monitoring of polycrystalline ingot substation of Siyang Ruitai Photovoltaic Materials Co., Ltd. According to the requirements of power distribution system management, it is necessary to monitor the high voltage cabinet and low voltage distribution line in the polycrystalline ingot substation to ensure the safe, reliable and efficient use of electricity.

Acrel-3000 power management system, take full advantage of the latest developments of modern electronic technology, computer technology, network technology and fieldbus technology, decentralized power distribution system for distributed data collection and centralized monitoring and management. The secondary equipment of the power distribution system is networked. Through the computer and the communication network, the distributed site equipment of the power distribution substation is connected as an organic whole to realize the remote monitoring and centralized management of the power grid operation.

5.1 System structure description

The monitoring system is mainly used for power monitoring and power management of 20 / 0.4kV power distribution system in polycrystalline ingot substation. The monitoring range is low pressure of 1A, 1C, 1E, 1F, 1M, 1N transformers in substation Line cabinets, cabinets, feeder cabinets and high-pressure side instrumentation, integrated protection device for remote real-time monitoring and power management. The system has a total of 141 An Kerui intelligent instruments, 6 temperature controller, 12 sets of integrated protection, sub-10 bus, low voltage substation and high voltage room away from the duty room not far from the direct use of shielded twisted pair connection to Serial server, and finally connected to the network switch through the network cable to monitor the host through the network switch to achieve the bus on the meter and monitor the host data connectivity.

5.2 Network topology diagram

The monitoring system uses a hierarchical distributed structure, namely the station control layer, communication layer and the interval layer;

Network topology

Interval device layer are: multi-function network power meter, switch, analog acquisition module and intelligent circuit breakers. These devices correspond to the corresponding primary equipment installed in the electrical cabinet, these devices are used RS485 communication interface, through the site MODBUS bus network communication, data acquisition at the scene.

The main network communications layer: communications server, its main function is to gather in the field collection devices collected at the same time, remote control station to the station to complete the scene layer and station control data exchange between layers.


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