subway
When we arrived at the subway station ahead, there were stairs leading up, and several people ran up the stairs. Several wild beasts were watching eagerly below.
Several people ran upstairs. The monster chased him upstairs.
There is an abandoned subway upstairs, there are no screen doors on the platform, and there is a bad smell all around. There are subway tracks going forward and behind, extending to who knows where, and there is an abandoned subway car in the middle.
Several people went up to try to open the door of the subway car. They found that there was no braking device, so they opened it and got in.
The monster was chasing after him, and Fu Shuo subconsciously hit it with a flashlight. It was discovered that the monster had bitten the flashlight and bit out the battery inside.
"For the first time, I discovered that people rely on sucking electricity to fill their stomachs. This power outage is probably caused by them," Fu Shuo said.
"The battery is direct current, and the power supply is alternating current." Yonghan said.
"You don't care what kind of electricity it is, anyway, one is constant and the other is big and small. Anyway, they can be used as food." Fu Shuo said.
The monster used the tentacles next to its mouth to drain the battery, and looked at the subway car, trying to find a way to get in again. Started hitting the car window with his paws and mouth. Several people started to go to the rear of the carriage. Fu Shuo opened the rear door, revealing the railroad tracks in front.
After running for a while, there was a door next to it. The monster chased after him, so Yonghan threw the flashlight over to delay for a while. Inside is an abandoned subway control center, with some dashboards and some scattered wires next to it.
There was a window next to the house, and the monster got in through the window. Several people got under the console and sniffed the wires after entering the house.
Yonghan gestured, and several people moved to the other door step by step using the console as a shield. A monster rushed over, climbed on the console, looked around, waving its tentacles, and drool dripped to the ground.
As they neared the door, Yonghan took out an old table leg from the trash pile nearby as a weapon.
Several people ran out quickly. The monster is still checking the electrical wiring inside the house.
track
I ran out of the house and saw a rail car, which may have been left by the workers who originally repaired the circuit. This rail car should be able to shuttle between various power supply systems. The workers walk one route, and the railcars walk another route.
"How to activate this?" Fu Shuo asked.
Yonghan looked at it and said, "Wait a moment and use the electrician's instructions to open it. I'll apply for a password online."
At this time the monster ran out. Qu Fei threw the flashlight over and delayed for a while.
He filled out some basic information, hit submit, and a moment later the electrician's instructions came to his handheld meter. He entered instructions on the operating panel of the rail car and started the rail car.
Hearing the sound of the rail car starting and running, the monster chased after it again. They defended themselves with wooden and iron rods.
The rail car ran for a while and gradually slowed down, as if it was out of power. They went to the power distribution room next to it to find a rechargeable battery, and then installed it again. During this time the agent threw the flashlight over.
"The flashlight is gone. Next time I have to throw away my mobile phone and handheld instruments." Yonghan said.
After walking for a while, I saw a running figure. It turned out to be Electrician Shuo.
"Come up quickly!"
He jumped on the rail car.
"Thank you for meeting us. Otherwise, what would you do if there were so many monsters? But you will need to use your flashlight later, and your handheld meter to attract their ideas. They absorb electricity."
The end of the track is reached and the railcar gradually slows down. They jumped out of the car and looked for the exit. Fu Shuo told Shuo to quickly throw the flashlight.
Shuo said, "Why are you throwing the flashlight?" Fu Shuo took it and threw the flashlight, and a group of monsters rushed towards him. "Delay time." Fu Shuo said.
Yonghan said: "Look for the exit quickly. There is an exit here on the map."
Testing Center
Squeezing into a room, the space is relatively large, and there are power detectors inside.
"What's next?" Qu Fei said.
"This door is relatively far on the map." Fu Shuo said.
Several people ran towards the marked door. The monsters chased in and seemed to be more numerous than before. Qu Fei, Yong Han, Shuo ran to the left. Meng frame started and Fu Shuo ran to the right. Just go around this testing center. When I got to the door, I found that there was an electronic lock on the door and it was locked.
"You also need to register an electrician account to unlock the door."
"Throw something away as soon as possible." Yonghan said, throwing Shuo's electrician's handheld instrument out. Shuo was very dissatisfied, "Why didn't you throw it away?"
"We have all thrown it away." Yonghan said.
The door opened, and it was a small room. It seemed that the only way to get out was through other doors next to it. Yonghan continued to look for the door and opened it. Fu Shuo came over to the house to see if the testing equipment could still be used. It showed that it could detect voltage, current, power harmonics, etc. After opening, the voltage and current cannot be measured. Only harmonics can be measured.
Yonghan came in and closed the door.
"These detectors correspond to the electrical energy in different locations. There are monsters in some places, and because they are sucking electrical energy, the electrical energy characteristics are different."
"Now we can only see harmonics," Fu Shuo said.
Harmonics refer to components that are greater than integer multiples of the fundamental frequency obtained by Fourier series decomposition of periodic non-sinusoidal alternating currents. They are usually called high-order harmonics, and the fundamental wave refers to its frequency and power frequency. Same component as 50Hz. The interference of higher harmonics is more harmful to the current power system.
The frequency of harmonics must also be equal to an integer multiple of the frequency of the fundamental wave. A wave with a frequency three times the fundamental wave is called a third harmonic, a wave with a frequency five times the fundamental wave is called a fifth harmonic, and so on.
There are harmonics generated at the power supply end: the three-phase windings of the generator are not absolutely symmetrical, and the core is not absolutely uniform.
Harmonics generated in the power transmission and distribution process: The magnetization curve of the iron core is in a nonlinear saturation state, producing odd harmonics.
Harmonics generated by power equipment: rectifier thyristor equipment. Frequency conversion equipment. Gas discharge type electric light source. Household electrical appliances. In electrical equipment containing windings, the power waveform changes due to changes in unbalanced current. Some equipment has a certain voltage regulation and rectification function, which will produce high-order odd harmonic components.
"Analyze the harmonic characteristics and look at the spectrum. The peaks of the first, second and third harmonics are different from those in a normal room."
"Which one is the normal room?"
"The room we are in now." Yonghan said. "We can use harmonics to mark the room and location of the monster, and then find the escape route."
Because there are no monsters in this small room, the power consumption curve here is considered normal. Look at the harmonic waveforms in other rooms. Some are slightly different. If there is an obvious difference, there should be monsters. This kind of monster that absorbs electric energy, let's call it the electricity-sucking beast for now.
Yonghan marked an S shape on the map, and the route bypassed the room where the electricity-sucking beast was. Several people started leaving along this route.
