Maximum allowable voltage of miner

1. The maximum voltage allowed by the circuit depends on the bulb. It's a low-pressure mercury lamp that needs high-pressure arc ignition. The question is vague!

2.

10kV in the power system is only a voltage level, in the power side (power plant) and load side of the provisions are certainly different

the rated voltage of 10kV system in power plant is 10.5kv, which is generally allowed to increase by 5%, which is above 11kv. At the load side, the user power supply standard is mainly considered, which is lower than the power plant voltage

The commonly used voltage levels in China are: 220 V, 380 V, 6.3 kV, 10 kV, 35 kV, 110 kV, 220 kV, 330 kV, 500 kV and 1000 kV. Power system is generally composed of power plants, transmission lines, substations, distribution lines and electrical equipment. Generally, the voltage line above 35kV is called transmission line

The voltage line of

35kV and below is called distribution line. The rated voltage above 1kV is called "high voltage", and the rated voltage below 1kV is called "low voltage"

extended data:

China's safety voltage is 42V, 36V, 24V, 12V and 6V

in AC voltage level, 1kV and below are usually called low voltage, 1kV and above, 35kV and below are called medium voltage, 35kV and above, 220kV and below are called high voltage, 330kV and above, 1000kV and above are called ultra high voltage, 1000kV and above are called ultra high voltage

In

DC voltage level, ± Below 800kV is called high voltage, ± 800kV and above is called UHV

with the increase of load, the adaptability of the current voltage level sequence in some areas of China is limited, so it is necessary to adopt a new voltage level sequence. The implementation scheme of voltage level configuration needs in-depth feasibility study according to the specific situation of the city

for areas with high final load density, it can be considered to graally transition to higher medium voltage distribution voltage. For the areas with low final load density and long power supply distance, higher medium voltage distribution voltage can also be considered

in order to avoid the influence of power supply reliability in the process of introcing new voltage level, the way of installing tie transformer can be used to make power grids with different distribution voltage levels run in parallel

for the regions adopting the new voltage level sequence, the internationally accepted way of graal encroachment can be adopted. After several years of graal transition, the target voltage level sequence mode can be formed

3. High motor voltage will only increase the speed, the voltage increase of 10-20% will not damage the motor.

4.

36V

the safe voltage refers to the voltage that does not cause direct death or disability to people, and the "safe extra low voltage" that allows continuous contact under general environmental conditions is 36V. According to the instry regulations, the safety voltage is not higher than 36V, the safety voltage for continuous contact is 24V, and the safety current is 10mA. The harm degree of electric shock to human body mainly depends on the size of the current passing through the human body and the length of the power on time

extended data

the greater the current intensity, the greater the fatal risk; The longer the ration, the greater the probability of death. The minimum current that can cause people to feel is called sensing current, which is 1mA for AC and 5mA for DC; The maximum current that a person can get rid of after being electrocuted is called escape current, which is 10mA for AC and 50mA for DC

the life-threatening current in a short period of time is called lethal current. If the current of 100mA passes through the human body for 1s, it can be fatal, so the lethal current is 50mA. In the case of electric shock protection device, the current allowed by human body can be considered as 30mA

5.

10kV in the power system is only a voltage level, in the power side (power plant) and load side of the provisions are certainly different

the rated voltage of 10kV system in power plant is 10.5kv, which is generally allowed to increase by 5%, which is above 11kv. At the load side, the user power supply standard is mainly considered, which is lower than the power plant voltage

The commonly used voltage levels in China are: 220 V, 380 V, 6.3 kV, 10 kV, 35 kV, 110 kV, 220 kV, 330 kV, 500 kV and 1000 kV. Power system is generally composed of power plants, transmission lines, substations, distribution lines and electrical equipment. Generally, the voltage line above 35kV is called transmission line

The voltage line of

35kV and below is called distribution line. The rated voltage above 1kV is called "high voltage", and the rated voltage below 1kV is called "low voltage"

extended data:

China's safety voltage is 42V, 36V, 24V, 12V and 6V

in AC voltage level, 1kV and below are usually called low voltage, 1kV and above, 35kV and below are called medium voltage, 35kV and above, 220kV and below are called high voltage, 330kV and above, 1000kV and above are called ultra high voltage, 1000kV and above are called ultra high voltage

In

DC voltage level, ± Below 800kV is called high voltage, ± 800kV and above is called UHV

with the increase of load, the adaptability of the current voltage level sequence in some areas of China is limited, so it is necessary to adopt a new voltage level sequence. The implementation scheme of voltage level configuration needs in-depth feasibility study according to the specific situation of the city

for areas with high final load density, it can be considered to graally transition to higher medium voltage distribution voltage. For the areas with low final load density and long power supply distance, higher medium voltage distribution voltage can also be considered

in order to avoid the influence of power supply reliability in the process of introcing new voltage level, the way of installing tie transformer can be used to make power grids with different distribution voltage levels run in parallel

for the regions adopting the new voltage level sequence, the internationally accepted way of graal encroachment can be adopted. After several years of graal transition, the target voltage level sequence mode can be formed

6.

220V-380V

three phase voltage is the voltage between phases. There are many kinds of voltage standards all over the world, including three-phase voltage of 220 V, three-phase voltage of 380 V and other voltages; In addition, the frequency is also 50 Hz and 60 Hz

the three-phase voltage standard in China is 380V, the frequency between each phase is the same, the frequency is 50 Hz. Because star connection is used to connect residential electricity, if three-phase 380V is used in China, it means line voltage, and its phase voltage is 220V; If we say three-phase 220 V, it means line voltage, and its phase voltage is 127 v. Taiwan and other places are such power sources

Japan is a special case in the world. The East and west of Japan are different power grids, with phase voltages of 120V / 60Hz and 220V / 50Hz respectively. At the same time, it is connected to the triangle connection of residential electricity, so the line voltage and phase voltage in Japan are equivalent

in daily life, the single-phase AC voltage is 220 V, while the three-phase AC voltage is 380 V, and the single-phase AC voltage is 220 v. there are two kinds of voltage, one is phase voltage, that is, the voltage between a live line and a zero line, so the voltage is 220 v

The other is line voltage, that is, the voltage between two arbitrary live wires, which is calculated by various formulas, that is, the line voltage is 1.732 times of the phase voltage. That is, 220 times 1.732 equals 380, so the line voltage is 380V

extended data

there are many reasons for three-phase voltage imbalance, such as single-phase grounding, broken line resonance, etc

If one phase is broken but not grounded, or one phase of circuit breaker and disconnector is not connected, the fuse of voltage transformer is blown, which will cause three-phase parameter asymmetry. When one phase of the line of the previous voltage level is broken, the voltage of the next voltage level shows that the voltage of all three phases decreases

one phase is lower and the other two phases are higher, but their voltage values are close. When the line at the same level is broken, the phase voltage of the broken line is zero, and the phase voltage of the unbroken line is still the phase voltage

When one phase of the line is broken and single-phase grounded, although the three-phase voltage is unbalanced, the voltage value does not change after grounding. Single phase grounding is divided into metallic grounding and non-metallic grounding

When the fault phase voltage is zero or close to zero, the non fault phase voltage increases by 1.732 times and remains unchanged; For non-metallic grounding, the grounding phase voltage is not zero, but decreases to a certain value, and the other two phases increase less than 1.732 times

With the rapid development of instry, the nonlinear power load increases greatly, some loads not only proce harmonics, but also cause power supply voltage fluctuation and flicker, and even cause three-phase voltage imbalance< There are two kinds of unbalanced three-phase voltage caused by resonance:

one is fundamental frequency resonance, which is similar to single-phase grounding, that is, the voltage of one phase decreases and the voltage of the other two phases increases. It is difficult to find the fault point when finding the fault reason. At this time, special users can be checked. If it is not the grounding reason, it may be caused by resonance. The other is frequency division resonance or high frequency resonance, which is characterized by simultaneous rise of three-phase voltage

7. The power supply terminal is the power plant or substation, and the maximum voltage is + 10% of the rated voltage, which is 72.6kv< The maximum voltage of the user terminal is + 5% of the rated voltage, which is 69.3kv.

power quality allowable deviation of supply voltage (GB 12325-90) stipulates that under normal operation conditions of power system, the allowable deviation of the supply voltage of the user's receiving terminal is + 5% ～ - 5% of the rated voltage for power supply of 35kV or above and users with special requirements for voltage quality
the voltage at the power supply terminal should be 5% higher than that at the receiving terminal to overcome the line voltage drop,

8. N You need to be determined by the load allowed by the series circuit.

9. No, only 9-16 is its rated voltage (safe operating voltage)

10. < UL >

R = u / I u = RI the first U1 = 10 * 1 = 10 U2 = 15 * 0.6 = 9 series connection: the current is equal, 0.6 u = RI = (10 + 15) * 0.6 = 15V parallel connection: the voltage is equal, take the small voltage as 9V

< / UL >