SF6 recycling system, SF6 recycling system for high-frequency circulation use

SF6 recycling system for high-voltage testing, SF6 recycling system for cyclic use, and SF6 recycling system for high-frequency use. Such systems require repeated communication and scheme design, and sometimes on-site investigation. Shanghai Keshi will tailor a solution that meets the needs of customers. Shanghai Keshi has rich experience in this type of case. Welcome to consult. The fully automatic large-scale SF6 recovery, charging and discharging system mode A (product placed in the test tank) delivered for use in March 2020: test tank closed - vacuum pumping - SF6 filled to design value - post test - SF6 recovery - emptying - test tank open mode B (no test tank): product packaging completed - vacuum pumping to design value - SF6 filled to design value - waiting for test or leak detection, etc. - SF6 recovery - end mode A. Due to the unique insulation ability of SF6, high-voltage insulation test, partial discharge test and other items are often conducted in SF6 gas during the factory test of high voltage and ultra-high voltage products, and the products are placed in the test tank. Shanghai Keshi's clients of this type include: Shanghai Leibosi, Zhejiang Qiyi, Yangzhou Leiyu, Liaoning Weineng, 63761 Unit (confidential project), etc; Mode B: Use SF6 to conduct leak testing on products, with daily cyclic use of SF6 up to several hundred kilograms. The most commonly used methods are GIS shell leak testing, assembly GIL or GIS leak testing, GIL or GIST high voltage testing, etc; Shanghai Keshi's customers of this type include Zhejiang Kaibo, Tai'an Juli, Jiangsu Ankao, Shanghai Zhengtai, etc; In the above two situations, due to the circulation and extensive use of SF6, the speed and recovery of SF6 recovery system .....

SF6 recycling system for high-voltage testing, SF6 recycling system for cyclic use, SF6 recycling system for high-frequency use

This type of system requires repeated communication and scheme design, and sometimes on-site investigation. Shanghai Keshi will tailor a solution that meets the needs of customers.
Shanghai Keshi has rich experience in this type of case. Welcome to consult.


Fully automatic large-scale SF6 recovery, charging and discharging system delivered for use in March 2020

Mode A (product placed in the test tank): Close the test tank - evacuate - fill SF6 to the design value - wait for the test - recover SF6- break the empty space - open the test tank
Mode B (without test tank): After product packaging is completed - evacuate to design value - fill SF6 to design value - wait for testing or leak detection, etc. - recover SF6- end

Mode A: Due to the unique insulation capability of SF6, high-voltage and ultra-high voltage products are often subjected to high-voltage insulation tests, partial discharge tests, and other tests in SF6 gas during factory testing, and the products are placed in test tanks. Shanghai Keshi's clients of this type include: Shanghai Leibosi, Zhejiang Qiyi, Yangzhou Leiyu, Liaoning Weineng, 63761 Unit (confidential project), etc;

Mode B: Use SF6 to conduct leak testing on products, with daily cyclic use of SF6 up to several hundred kilograms. The most commonly used methods are GIS shell leak testing, assembly GIL or GIS leak testing, GIL or GIST high voltage testing, etc; Shanghai Keshi's customers of this type include Zhejiang Kaibo, Tai'an Juli, Jiangsu Ankao, Shanghai Zhengtai, etc;
In the above two situations, due to the circulation and extensive use of SF6, the speed and recovery efficiency of the SF6 recovery system are the core indicators.

Let's give an example to illustrate;
Customer Requirement 1:


This system includes pipelines, SF6 recovery, inflation, and vacuum pumping systems, gas storage tanks, and control systems.
In this planThe customer did not mention the final pressure and vacuum limit values for the SF6 recovery system. The design and manufacturing manufacturer should inform or remind the customer to clarify these important parameters. Once the equipment is delivered and accepted, it may become a failed project.
Of course, there are many other pieces of information here that require confirmation from both the supply and demand sides.



Similar needs of another customer:



Here is some information about a project we delivered and used in March 2019 to share with you. This is a system with a smaller test tank and higher testing frequency.

1、 Testing process
Open the test tank - Place the tested insulation component - Close the lid - Vacuum to the set value - Fill SF6 to the set pressure - Voltage withstand test - Test completed - Recover SF6- Recover completed - Recharge air - After recharging is completed - Open the test tank
SF6 loss - automatically replenish new gas from the gas cylinder (place the cylinder in the recovery device);
2、 Technical parameters
(The following content was discussed and clarified at the Shanghai Keshi site on November 14, 2018)
1. The volume of the test tank is 200 * 300H; 3 parallel vacuum pumps to 5-10 Pa;
2. Work cycle (vacuuming time+filling time+recovery time+air replenishment time)
That is, the entire testing process time minus the withstand voltage testing time; SF6 working time is 5-6 minutes;
3. Recycling efficiency; More than 97%;
4. Fully automated completion;
5. Configure the interface of the purity micro water tester;
6. The connection with the test tank adopts DN13 pipeline and M27 thread.
3、 Main components of the equipment
Cabinet: Dimensions 1600 * 800 * 1700mm, with movable casters
Gas storage tank: 100L
Vacuum pump: 40m3/h oil-free vacuum pump
Compressor: 14m3/h
Filter drying system
solenoid valve
PLC and touch screen
Internal and external pipelines
The following pictures are for reference only






Touch screen settings



4、 Operation process
1. After booting up, the screen displays manual, automatic, and parameter settings.
2. The parameter settings are for various control and protection points, which are set at the factory and may be slightly modified during debugging.
3. Automatically divided into:
A、 evacuate
B、 recycle
C、 inflate
D、 You can choose to complete the entire process with just one click
4. If vacuum pumping is selected, the system automatically opens the corresponding valve, then starts the vacuum pump, reaches the set value, automatically stops and closes the corresponding valve.
5. If recycling is selected, the system automatically opens the corresponding valve, then starts the compressor, and begins recycling until the test tank reaches the set pressure, then automatically closes the valve and stops the machine.

that
The recycling system debugging site



The following picture shows a large SF6 recovery system and a large vacuum pumping unit delivered by Shanghai Keshi in March 2020


The large vacuum units delivered simultaneously use imported Leybold vacuum pumps;



Debugging site