It's just that the calculation of short-circuit current is a bit complicated?

For reference, just change it to the following.

Article 3.3.65438 +0? In a substation with two or more main transformers, it is recommended to install two transformers with the same capacity as each other for backup. If a reliable low-voltage standby power supply can be introduced from outside the substation, a transformer can also be installed. When there is only one power inlet and one main transformer in the 35kV substation, a transformer can be installed in front of the power inlet circuit breaker.

Article 3.3.2? The DC bus of substation should be connected by single bus or segmented single bus. When using segmented single bus, the battery should be able to switch to any bus.

Article 3.3.3? A set of 1 10V or 220V fixed lead-acid batteries or cadmium-nickel batteries shall be used as the operating power supply for important substations. A set of silicon rectifier should be used for charging and floating charging. The operating power supply of other substations should be a complete set of small-capacity cadmium-nickel battery devices or capacitor energy storage devices.

Article 3.3.4? The capacity of the battery pack shall meet the following requirements:

A, the floor accident power outage 1h discharge capacity:

The second is the maximum impact load capacity at the end of accident discharge.

The capacity of Cd-Ni battery in small capacity Cd-Ni battery device should meet the requirements of tripping, signal and relay protection.

Article 3.3.5? Substation should be equipped with a fixed maintenance power supply.

Article 3.5.65438 +0? The following elements in the substation shall be controlled in the control room:

First, the main transformer;

Two, bus section, bypass and bus circuit breaker;

3. 63 ~ 1 10 kv indoor and outdoor distribution equipment lines and 35 kv outdoor distribution equipment lines. Feeders of 6 ~ 35kV indoor distribution equipment should be controlled locally.

Article 3.5.2? Substations with people on duty should be equipped with central accident signal and early warning signal devices that can repeatedly act, automatically release the delay or manually release the sound. In the substation on duty, simple accident signal and repeated alarm signal devices can be installed. Unattended substations can be equipped with simple accident signals and early warning signals. When the remote control device stops, these signals will be switched to the local control of the substation. The control circuit of circuit breaker should have monitoring signal.

Article 3.5.3? A group locking device shall be installed between the disconnector and the corresponding circuit breaker and grounding circuit breaker. The distribution equipment in the house should be equipped with facilities to prevent it from entering the living space by mistake. The power supply of interlocking circuit shall be separated from the power supply of relay protection and control signal circuit.

Article 3.2.65438 +0? The main wiring of the substation should be determined according to the status of the substation in the power grid, the number of outgoing circuits, the characteristics of equipment and the nature of load. It should also meet the requirements of reliable power supply, flexible operation, convenient operation and maintenance, investment saving and easy expansion.

Article 3.2.2? When the operation requirements can be met, the high voltage side of the substation should be less connected or not connected with circuit breakers. ?

Article 3.2.3? When the 35 ~ 1 10 kV line is ≤ secondary, bridge, line transformer group or line branch connection shall be adopted. When it is more than twice, it is appropriate to use expansion bridge, single bus or segmented single bus connection. When 35 ~ 63kV lines have 8 or more lines, double bus connection can also be used. 1 10kV line has 6 circuits or more, double bus connection shall be adopted.

Article 3.2.4? In 35 ~ 1 100 kV, the main wiring adopts single bus, segmented single bus or double bus. When the circuit breaker is not allowed to be repaired during power failure, bypass facilities can be set up.

When there is a bypass bus, first of all, it is advisable to use a segmented circuit breaker or a bus coupler circuit breaker as the wiring of the bypass circuit breaker. 1 10kV lines have six or more circuits, and 35 ~ 63 kV lines have eight or more circuits, so special bypass circuit breakers can be installed. The breaker in the 35 ~ 1 10 kV circuit of the main transformer can also be connected to the bypass bus when conditions permit. The main wiring with SF6 circuit breaker should not be equipped with bypass facilities.

Article 3.2.5? When the substation is equipped with two main transformers, the 6 ~ 10 kV side should adopt segmented single bus. When the line is above 12 loop, double bus can also be used. Circuit breakers are not allowed to be repaired during power failure, and bypass facilities can be set up. When handcart high-voltage switchgear is used in 6 ~ 35kV distribution equipment, it is not appropriate to set bypass facilities.

Article 3.2.6? When it is necessary to limit the short-circuit current of 6 ~ 10 kV line in substation, one of the following measures can be adopted:

First, the transformers operate separately;

Second, use high impedance transformer;

Third, install a reactor in the transformer circuit.

Article 3.2.7? The lightning arrester and voltage transformer connected to the bus can share a set of isolating switches. The lightning arrester on the outlet of transformer should not be equipped with isolating switch.

Article 3.6. 1? The lighting design of substation should meet the requirements of the current national standard "Lighting Design Standard for Industrial Enterprises".

Article 3.6.2? Emergency lighting should be installed in the control room, indoor distribution equipment room, storage battery room and main passages in the house.

Article 3.6.3? The installation position of lighting equipment should be convenient for maintenance. Lighting of outdoor power distribution equipment and lighting devices can be installed in the framework of power distribution equipment, but they should meet the requirements of the current national standard "Code for Design of Overvoltage Protection of Power Equipment".

Article 3.6.4? When observing the screen in the monitoring position of the main screen and the working position in front of the screen in the control room, there should be no obvious reflected glare and direct sunlight.

Article 3.6.5? Explosion-proof illuminators should be used for indoor lighting of lead-acid batteries, and switches, fuses, sockets and other electrical appliances that may generate sparks should not be installed in the battery room.

Article 3.6.6? The lighting voltage in the cable tunnel should not be higher than 36V. If it is higher than 36V, safety measures should be taken to prevent electric shock.