Comparative analysis of the benefits of using digital SF6 integrated on-line monitoring equipment for gas micro-water

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Comparative analysis of the benefits of using digital SF6 integrated on-line monitoring equipment for gas micro-water

发布时间：2018-08-27 来源：ydlcb 浏览次数：31次

110KV using SF6 gas as insulation and arc extinguishing medium; 500KV high-voltage circuit breakers have been widely used at home and abroad, but whether the humidity and density of SF6 gas are within the rated range determines whether the insulation and arc extinguishing performance of SF6 gas is effective or not, so the operation regulations of the national power company mandate: Before and during the operation of the equipment, the density and humidity of SF6 gas must be tested regularly.

With the strong support of Shanghai Electric Power Company, Wevers Testing Technology (Shanghai) Co., Ltd. R & D and production of digital SF6 gas micro-water integrated online monitoring equipment after years of operation practice in Shanghai, Jiangsu, Sichuan, Guizhou, Hebei, Inner Mongolia and Heilongjiang power grid and power plants proved that its technology is advanced and reliable (micro-water monitoring equipment identification conclusions: “ International XIANJIN” Conclusion of density monitoring equipment identification: “ Filled the domestic void ”) The economic and social benefits are considerable. The popularization and use of it is helpful to realize the management objectives of substation unattended and efficiency improvement proposed by the State Electric Power Company.

Based on the statistics of Sichuan Power Supply Company, this paper makes a comparative analysis of SF6 gas online detection equipment before and after use from four aspects: equipment, management, maintenance and environmental protection, in order to obtain quantitative economic and social benefit analysis results for users' reference.

1. Equipment comparison analysis table

1. 3 sets of SF6 micro-water measuring instruments, worth 400,000 yuan

2. Aeration connector 20– 30 sets, 300,000 yuan

3. Four sets of 5750 qualitative leak detector, worth 400,000 yuan

4. Four sets of quantitative leak detector, 600,000 yuan

5. 20 bottles of SF6 gas, 10,000 yuan per bottle, 200,000 yuan

6. One SF6 gas recovery device, worth 500,000 yuan

B: Because the digital SF6 gas micro-water integrated online testing equipment is online measurement and control, the common equipment is basically not used, so it can save more than 2 million yuan.

2. Management comparative analysis table

A: If you do not use the digital SF6 gas micro-water integrated online detection equipment:

1. Can not meet the requirements of state maintenance, should be repaired as much as possible. Because no matter the new or old equipment has no SF6 gas moisture and density comprehensive state display, only the alarm device, when the alarm, SF6 gas has leaked a lot, and some of the gas chamber leakage. 50%.

2. It is not possible to achieve planned power failure, controllability, targeted maintenance, etc., and there are blind power failure maintenance according to regulations. For example: a gas chamber leakage SF6 gas alarm, do not know which gas chamber is leaking. It is possible to test each of the three chambers before servicing them. Water exceeding the standard maintenance and air leakage maintenance are two concepts, to be repaired separately, so often passive power outage, blind follow the test.

3. Can not effectively reduce staff efficiency, because it is not online automatic monitoring, the staff has to visit the site once every two days. Cost of labor, vehicle machinery shift, test equipment maintenance and depreciation costs. A complete test of an air chamber takes about 45 %. 55 minutes, sample gas flow rate 30 %; 45L/h, the emission of SF6 gas is about 35 liters, and then replenish the gas, in short, the operation is complicated, time-consuming and costly. According to statistics, 18 substations in a district of Nanjing require about 18 workers.

4, can not achieve the true sense of automated management, because both the new and old circuit breakers, only the leakage gas alarm system, there is no SF6 gas density, humidity, temperature unified field display, not to mention its dynamic remote transmission, so the senior management can not in the monitoring center or their own office to see the real-time dynamic SF6 gas remote transmission.

B: If the digital SF6 gas micro-water integrated online detection equipment is used:

1. It can fully meet the requirements of state maintenance and repair in the true sense of Guodian Company. Because the digital SF6 gas micro-water integrated online detection equipment displays the density, humidity and temperature of SF6 gas, it can deal with the problems at any time, and will never leak so much SF6 gas.

2. The digital SF6 gas integrated online detection equipment can display the density, humidity and temperature of SF6 gas in each gas chamber, as well as early warning and locking control nodes, so that planned power failure, targeted maintenance and controllable operation can be achieved. The disadvantages of empirical management have been eliminated, and the high level of strict and scientific management has been reached.

3. Achieved the goal of reducing staff and increasing efficiency. According to statistics, after Nanjing adopted the digital SF6 gas micro-water integrated online detection equipment, only 21 workers were used in 40 substations in a district.

4. It can fully achieve scientific and automated management in the true sense of high-level management, because the real-time gas density, humidity and temperature displayed by the digital SF6 gas micro-water integrated online monitoring equipment can be transmitted far.

3. Maintenance comparative analysis table

A: No digital SF6 gas micro-water integrated online testing equipment is used:

1. Take a 110KV substation as an example: 2 transformers, 3 circuit breakers, due to regular power outage maintenance in accordance with the regulations, two days of regular inspection, resulting in external labor costs, vehicle transportation costs, equipment shift costs, test instrument testing costs, machine depreciation costs, SF6 gas and other consumables costs, 15 per year; Two hundred thousand yuan.

2. Power outage maintenance sells about 60,000KW/ h less electricity. A 110KV substation has 2 transformers and 3 circuit breakers, because SF6 micro-water and leak inspection are two concepts. Therefore, it is necessary to regularly test once a year, a total of 3. Four hours. Closing and opening time, simultaneous test, action electric test, contact electric test, micro-water test, etc. According to the average power supply is about 15,000KW/ h, the electricity sold in 4 hours is 31,200 yuan less (15,000KW/ h × 4× 0.52 yuan/degree = 31,200 yuan).

B: The digital SF6 integrated online detection equipment for gas micro-water is used:

1. Because it is online monitoring of the real-time status of remote SF6 gas density, humidity, temperature, etc., the hidden danger can be eliminated in the bud. Therefore, the cost of power outage maintenance and periodic maintenance according to the operation rules of the power grid can be basically eliminated.

2. Online monitoring without power failure without loss. Because no power outage maintenance can create 31,200 yuan of benefits.

Fourth, environmental protection comparative analysis ring table

A: There is no SF6 gas online monitoring of high-voltage circuit breakers, only gas leakage, so that the pressure is lower than the rated alarm value, or regular inspection is detected, due to the impact of ambient temperature changes on the pressure, SF6 gas generally in the alarm, most of the leakage; 50%, which causes SF6 gas to harm the body of maintenance personnel and pollute the atmosphere.

B: Because of the use of digital SF6 gas micro-water integrated online monitoring device, showing the real-time dynamics of SF6 gas, at any time to deal with the problem, so even SF6 gas leakage is rarely, can be targeted, timely and effective solution, thus protecting the environment, reducing the harm to the human body.

V. Comprehensive overview

The above analysis can clearly highlight the main economic benefits of using and not using the digital SF6 gas micro-water integrated online monitoring equipment:

1: If the digital SF6 gas micro-water integrated online monitoring is not used, the following maintenance costs will be spent:

(1) 40 substations above 110KV need to purchase common maintenance equipment of 2.4 million yuan. If it is depreciated for 5 years, each substation will be charged 11,000 yuan per year;

(2) The annual maintenance cost of each substation according to the regulations is 200,000 yuan;

(3) Annual power loss of 31,200 yuan per substation for power outage maintenance;

In total, the above three substations consume 241,200 yuan per year.

(4) If each substation has three circuit breakers, then one circuit breaker will consume 80,400 yuan;

(5) If each circuit breaker has three air chambers, then one air chamber consumes 26,800 yuan;

(6) If each circuit breaker has only one air chamber (this circuit breaker product is new and the price is high), then an air chamber consumes 80,400 yuan per year;

2: If the digital SF6 gas micro-water integrated online monitoring equipment is used, the cost of the above item A can be basically eliminated, so:

(1) The digital SF6 gas micro-water integrated online detection equipment of an air chamber requires about 30,000 yuan, so when a circuit breaker has only one air chamber, if the online monitoring equipment is used in the year, it can save 50,000 yuan SF6 gas repair costs, and then save more than 80,000 yuan SF6 gas repair costs every year.

(2) The digital SF6 gas micro-water integrated online testing equipment required by an air chamber is about 30,000 yuan, then a circuit breaker with 3 air chambers is about 90,000 yuan, but according to the regulations, a circuit breaker will consume 80,400 yuan a year repair costs, obviously the use of digital SF6 gas micro-water integrated online testing equipment, the year can recover 89.3% of the cost.

6. Sincere suggestions

In order to implement the national spirit of socialist construction on technological innovation, management innovation, efficiency first, good word first, saving and efficiency, and environmental harmony, we suggest: take the lead in adopting digital SF6 gas micro-water integrated online testing equipment in a district power supply system in Hohmarket. To evaluate the XIANJIN, stability and appreciable economic benefits of the equipment technology. If it can be achieved, only Hohmarket power supply company can save SF6 gas maintenance costs of 10,000 yuan per year. In addition, the operation and management cost saved by the whole Inner Mongolia Power Grid company in SF6 comprehensive monitoring is huge, and has reached the level of scientific management and automation.