Surveillance camera installation and monitoring camera power supply configuration

Power refers to the speed of work done by an object in a unit of time, that is, the power is a physical quantity that describes how fast the work is done. The amount of work is constant, and the shorter the time, the greater the power value. The formula for finding power is power = work / time.

Physical meaning: A physical quantity that indicates how fast an object performs.

Physical definition: The power done in unit time is called power. Power is the physical quantity that indicates how fast an object does work.

formula

Power can be divided into electric power, power of force, and the like. Therefore, the calculation formula is also different.

Electric power calculation formula: P = W / t = UI; in the pure resistance circuit, according to Ohm's law U = IR substituted P = UI can also get: P = I * IR = (U * U) / R

In dynamics: power calculation formula: 1. P = W / t (average power) 2. P = FV; P = Fvcosa (instantaneous power)

Because W=F(f force)×S(s displacement) (the definition of work), the formula for power can also be derived P=F·v:P=W /t=F*S/t=F* V (this formula is suitable for objects to make uniform linear motion)

unit

P represents power, the unit is "Watt", abbreviated as "Watt", and the symbol is "W". W stands for work, the unit is "Joule", referred to as "Joke", and the symbol is "J". "t" indicates time, the unit is "second", and the symbol is "s".

The higher the power, the higher the speed, the higher the maximum speed of the car, and the maximum power is often used to describe the dynamic performance of the car. The maximum power is generally expressed in horsepower (PS) or kilowatts (kW), and 1 horsepower is equal to 0.735 kilowatts. 1W=1J/s

How to properly configure the camera power of the entire monitoring system?

In the implementation of many programs, it was found that the power supply capacity of the original design was not enough, and additional equipment was needed, which caused a phenomenon with the party. In fact, because the camera starts at a moment, the starting current is very large, and the loss of long-distance transmission in engineering, the power required by the surveillance camera is not simply added to the rated power of all cameras. The correct way is to add the power of the camera of the entire monitoring system and multiply by 1.3 times. This is the actual power required by the camera, and then add about 30% of the loss. Finally, add 30% of the margin. Expansion will be used in the future.

for example:

If there is a fixed gun camera in a commercial building, and the rated power of each surveillance camera is 4W, how do we configure the camera power supply?

According to the above calculation method, we calculated that the rated power of the camera is 4W*100 units=400W.

The actual power used by the camera is 400W*1.3=520W

After considering the loss, the power required by the camera is 520W*1.3=676W.

With the power supply margin, the power supply that the camera finally needs to be configured is 676W*1.3=878W.

Summarized as follows: the power required to be configured by the camera = the rated power of the camera *1.3*1.3*1.3

(Note: If the monitoring distance is extremely long, it is necessary to increase the power supply appropriately and increase the power supply voltage)

What is the most taboo for the surveillance camera power supply?

The most taboo is that the entire monitoring system shares a power supply. The reasons are as follows:

1. When the system is being repaired, it is often necessary to turn the power on and off. All the cameras are started at the same time when the power is turned on, and the starting current is particularly large, and the impact on the power supply is great, and the power supply is severely burned.

2. All surveillance cameras share one power supply. When the power supply fails, the entire closed-circuit monitoring system is paralyzed. In particular, some important entrance and exit images cannot be monitored, which may cause unnecessary trouble.

3. What should be the correct approach? For example, a commercial building has 100 fixed cameras, which require a total of about 800W of power. The correct configuration should be 4, each 200W. In this way, when a power supply fails, the camera of the important entrance and exit can be connected to other good power supplies without affecting the operation of the entire system.