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How much do you know about box-type substations and ring main units?
Release time:
2019-08-14
Ring network cabinet refers to a closed ring network formed by power supply trunk lines in the power supply area in order to ensure the continuity, reliability and safety of high-voltage and low-voltage power supply systems in large residential areas, large shopping malls, and large power companies. The ring network is more than two box-type substations, as shown in the figure below, please pay attention: Rongji igniter
Each independent box-type substation (also known as a combined substation) in the ring network power supply is a factory prefabricated type that integrates high-voltage switchgear, distribution transformers and low-voltage power distribution devices according to a certain wiring method. , Indoor and outdoor very compact power distribution equipment.
At present, the basic structure of the box-type substation has two structures: a high-voltage room, a transformer room, and a low-voltage room, which are arranged in the shape of a mesh or separated in a shape of a pin, with or without operating corridors.
The power supply methods of the box-type substation are: ring network power supply, terminal power supply, and double-inlet power supply (including double-inlet line internal and external bridges), and these three power supply methods are extremely interchangeable. In general, cables or overhead can be used for wire entry. The high-voltage room adopts complete and reliable compact components such as SF6 circuit breaker, vacuum circuit breaker, compressed air load switch, etc., and has a comprehensive anti-misoperation interlock function. The low-voltage room is equipped with functions such as power, lighting, metering, reactive power compensation, and control. Transformers generally use oil-immersed transformers or dry-type transformers, and use temperature control, forced ventilation, and anti-condensation measurement ceremonies. The frame of the box-type power station is welded with formed steel or connected with bolts. The outer shell is mostly made of steel plate, hot-dip galvanized steel plate and aluminum alloy plate, and the surface is coated with protective paint. The following figure shows the power supply system diagram of the ring main unit.
There are two independent power supply lines in the high-voltage primary side transformer power supply line of the ring network power distribution, which adopts the form of single bus segment wiring. When one line is faulty, the other power distribution equipment can supply power.
① The two independent lines of the primary side transformer power supply line are respectively fed with a voltage of 10KV, one of which is stepped down to a voltage of 220/380V by the power transformers T1 and T2 respectively, which are the electrical equipment of Unit 1 and Unit 2. Power supply: The other way is to step down the voltage of 220/380V through the power transformers T3 and T4, respectively, to supply power to the electrical equipment of Unit 3 and Unit 4.
② When one power supply fails and cannot supply power, the high-voltage circuit breaker in the ring network cabinet can be closed. If the left power supply fails, close the high-voltage circuit breaker QF1, and the right high-voltage power supply can be used for the four branches. Transformer power supply.
③ Similarly, when one of the four ring main unit power transformers fails, the low-voltage side circuit breakers QF2, QF3, and QF4 can also be closed, and another power transformer can be used to continue to supply power.
Each independent box-type substation (also known as a combined substation) in the ring network power supply is a factory prefabricated type that integrates high-voltage switchgear, distribution transformers and low-voltage power distribution devices according to a certain wiring method. , Indoor and outdoor very compact power distribution equipment.
At present, the basic structure of the box-type substation has two structures: a high-voltage room, a transformer room, and a low-voltage room, which are arranged in the shape of a mesh or separated in a shape of a pin, with or without operating corridors.
The power supply methods of the box-type substation are: ring network power supply, terminal power supply, and double-inlet power supply (including double-inlet line internal and external bridges), and these three power supply methods are extremely interchangeable. In general, cables or overhead can be used for wire entry. The high-voltage room adopts complete and reliable compact components such as SF6 circuit breaker, vacuum circuit breaker, compressed air load switch, etc., and has a comprehensive anti-misoperation interlock function. The low-voltage room is equipped with functions such as power, lighting, metering, reactive power compensation, and control. Transformers generally use oil-immersed transformers or dry-type transformers, and use temperature control, forced ventilation, and anti-condensation measurement ceremonies. The frame of the box-type power station is welded with formed steel or connected with bolts. The outer shell is mostly made of steel plate, hot-dip galvanized steel plate and aluminum alloy plate, and the surface is coated with protective paint. The following figure shows the power supply system diagram of the ring main unit.
There are two independent power supply lines in the high-voltage primary side transformer power supply line of the ring network power distribution, which adopts the form of single bus segment wiring. When one line is faulty, the other power distribution equipment can supply power.
① The two independent lines of the primary side transformer power supply line are respectively fed with a voltage of 10KV, one of which is stepped down to a voltage of 220/380V by the power transformers T1 and T2 respectively, which are the electrical equipment of Unit 1 and Unit 2. Power supply: The other way is to step down the voltage of 220/380V through the power transformers T3 and T4, respectively, to supply power to the electrical equipment of Unit 3 and Unit 4.
② When one power supply fails and cannot supply power, the high-voltage circuit breaker in the ring network cabinet can be closed. If the left power supply fails, close the high-voltage circuit breaker QF1, and the right high-voltage power supply can be used for the four branches. Transformer power supply.
③ Similarly, when one of the four ring main unit power transformers fails, the low-voltage side circuit breakers QF2, QF3, and QF4 can also be closed, and another power transformer can be used to continue to supply power.
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