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What is power _ how to configure the monitoring system power supply

Sep 08, 2017

What is power _ how to configure the monitoring system power supply

Power is the object in the unit time to do the power of the speed, that is, power is to describe the power of the physical speed. The number of power must be, the shorter the time, the greater the power value. Find the power of the formula for the power = work / time.

Physical meaning

Physical meaning: that the object to do the power of the physical speed.

Physical definition: the unit time within the power of the call. Power is the physical quantity that represents the speed of the object

formula

Power can be divided into electrical power, power and so on. So the formula is also different.

In the pure resistance circuit, according to Ohm's law U = IR into P = UI can also be obtained: P = I * IR = (U * U) / R (P = W / t =

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

Since W = F (f force) × S (s displacement) (the definition of power), so the formula for generating power can also be derived P = F · v: P = W / t = F * S / t = F * V (this formula applies to objects to do uniform linear motion)

Unit

P is the power, the unit is "watts", referred to as "tile", the symbol is "W". W that work, the unit is "Joule", referred to as "coke", the symbol is "J". "T" means 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, the maximum power to describe the car's dynamic performance. The maximum power is generally expressed in horsepower (PS) or kilowatts (kW), 1 horsepower equal to 0.735 kilowatts. 1W = 1J / s

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

Many programs in the implementation of the time found that the original design of the power capacity is not enough, the need for additional equipment, resulting in the phenomenon and the body of the passing. In fact, because the camera at the start of the moment, start a large current, coupled with the long-distance transmission of the loss of the project, so the need to monitor the power supply camera, not simply add all the rated power of the camera. The correct approach is to add the rated power of the camera to the entire monitoring system by 1.3 times, which is the actual power required by the camera and then add about 30% of the loss; and finally add 30% of the margin as Future expansion use.

for example:

If a commercial building, there are 100 fixed gun-type camera, each monitor the rated power of the camera is 4W, how do we configure the camera power?

According to the above calculation method, we calculate that the rated power of the camera is 4W * 100 sets = 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

Plus the power margin, the camera finally need to configure the power supply is 676W * 1.3 = 878W

Summarized as follows: the camera needs to configure the power supply = camera rated power * 1.3 * 1.3 * 1.3

(Note: If the monitoring distance is particularly long, need to increase the power supply, and improve the power supply voltage)

Monitor the configuration of the camera power supply, the most taboo what?

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

1) system maintenance time, often need to open, turn off the power. All the cameras in the open power instantly start at the same time, start the current is particularly large, the impact of the power supply is very large, will burn the power seriously,

2) All surveillance cameras share a single power supply, and when the power supply fails, the entire closed-circuit monitoring system is paralyzed. Especially some important import and export of the image can not be monitored, may cause unnecessary trouble.

So the correct approach should be how? As in the above example, a commercial building has 100 fixed cameras, a total of about 800W power supply, the correct configuration should be selected 4, each 200W power supply. In this way, when a power failure, you can import and export of important cameras to other good power supply, and will not affect the work of the entire system.

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