Development of street lamp leakage protector

Scratch into the 2nd Army - the development of the school and the application of road safety protector Guizhou Provincial Electrical and Mechanical School 550003 Wang Zi Guizhou Provincial Institute of Electronics Zhang Qiaoying Guiyang City Qiao Deng Guanqiao Yangzhong Guizhou Dakeda Technology Industrial Company Chen Guodi [Aid] In view of the hybrid safety protection of street lamp metal rods, a voltage-type power-saving protector has been designed, which makes the mistakes of the transmission voltage type electro-chemical protection device and the operation action, 0 and insured. The problem between the bodies.

As an important part of urban design, street lamps have developed rapidly with the increasing intensity of urban construction. Traditional cement poles have been replaced by beautiful metal poles. However, metal poles are electrical conductors and are distributed along densely populated streets in urban areas. The wire joints, ballasts, triggers and other components of the street lamps are installed in the lamp post. During the operation of the street lamp, the insulation fails due to aging, damage, etc., and the lamp post becomes a charged body. Personal injury or death occurred.

It is not advisable to use zero-connection protection in the public power grid. Therefore, the cities in China mainly use grounding protection. Regardless of whether it is connected to zero or grounded, there is no guarantee that the culvert voltage will be reduced to the nationally specified safety voltage U2V. In order to reduce the grounding load and improve the safety of individual cities, the connection of the grounding bodies with conductors has indeed improved the safety. However, this increase is relative, and the absolute value of the leakage voltage is lower than the safety voltage requirements. There are problems such as huge construction cost and failure of the connecting conductor after corrosion. What is more serious is that the conductors of the protected body are connected by conductors. If any of the poles leak, the value of all the poles will become 1. After the next clock, 00 is again 1, and the cycle is repeated. 4, 8,; = phase clock source, see Figure 2 timing diagram. If you are using four phases. Five-phase, or six-phase stepping electrical phase can be achieved by using this method [phase separation. Of course, it can also be implemented by using other phase separation circuits.

When the time of the 8253 channel 2 arrives, the output pulse stops, and at the same time, the high level of the output of the channel 2 passes through the dipole camp, and the phase output is all cleared, and the motor stops running. And the value is 1, ready for the next start.

If you want to achieve the stepping motor double H beat sequence, just add the inverter to the output QO, Ql, 2 respectively. For the 7 implementation with [0 direction control, select analog switch 4066 to form 8, 0 commutation circuit, when 樵. 1 When the value of 0 changes to 1, the step motor reversal 2 software part and the stepper motor interface related programs are: 8253 control word, counting the initial value of the input. Motor direction control and trigger start.

The control of 8253 is as follows: 51, 50 selects the counter channel; just 1, 褛0 is the read/write indication bit; 12, "0" determines the working mode 8 count value format.

When the foot 1 is 01, the count value is 8 bits. When the foot 1 and the yang are 11, the smart value is 16 bits. In the circuit using the cascade as shown in Figure 1, under the 8-bit count, the maximum number of pulses that can be generated is 1 and in the 16-bit counting mode, the maximum number of pulses can be up to 18 [0 yards The user can select according to the maximum operating angle of the stepping motor.

The following is the subroutine of the 8253 control word and the initial value of the count, where 3 is the address of the 0~3 deduction 3, the order is the first address of the initial value storage unit, and the count value is 8 [0 yards of the double universe number) The low position is in the front, the high position is in the back, and the points are stored in order.

0 ¥ 4, 7 plus; 1 mode 2 18 [off motor running subroutine: to: 41 ¥ 5 delay 10 sentences to generate a negative pulse, so that the motor eyebrows in the actual application, the initial value of the count and input The frequency of the pulse determines the running speed of the motor. The higher the timing pulse frequency, the faster the speed and the faster the speed. The stepping motor is easy to lose the step and affect the positioning accuracy. The maximum speed of the stepper motor is 100~0 steps/smart. The port and the count value of the step and the step angle of the stepping motor 0 determine that the angle of the stepper motor is small, and the witch = white.

DJNAR7LOOPRET.1 determines the direction of motor operation and the application of "Electrician according to surgery 12, wearing soldiers and charging, the hidden danger is even greater.

The civil leakage protector is widely used and the technology is very mature, but it is current type, the leakage current is 30, the road is placed outdoors, the underground is thick and the environment is humid, and the leakage current of the underground is shrinking. It is much larger than 30A, so the existing current type leakage protector cannot be used. The traditional voltage type leakage protector has not been applied due to serious malfunction and refusal. Therefore, the safety protection of metal poles has become a big problem in the street lamp industry in China.

The road leakage protector we developed successfully solved the malfunction of the voltage leakage protector, the problem of rejection and the isolation between the protected body. The street light leakage protector has the following characteristics: 3 using electronic technology and The combination of electrical technology, control of strong electricity from the micro-string, the accuracy of the operating voltage, reliable work, completely solve the major mishaps of the 7-voltage leakage protector malfunction and rejection.

There is an isolation device between the lamp pole and the lamp post, which can reliably detect each lamp post. It is not possible to charge multiple poles due to leakage of the pole, and it is also easy to find fault points. A voltage type leakage protector is used. The leakage voltage acts as a control signal for the action of the protector, which overcomes the interference of the electric leakage current in a humid environment and is not affected by the grounding resistance.

1 electric composition and Wang Zuo principle The leakage protector is mainly operated by a switching circuit. Part of the leakage protection control circuit and the smart isolation circuit, as shown in Figure 1.

1.1 Working Switch Circuit This part is not only the switch of street lamp, but also the actuator of leakage protector. This topic selects the AC contactor as the working switch of the road. The electromagnetic coil is powered by the switch control power supply 12, and the normally open contact is used as the street light. The switch of 6 is connected to the main power supply. L2 power transmission, Kl coil energized, normally open contact closed, street light power is turned on, street light E is on; L2 power is off, Kl line is de-energized, normally open contact is disconnected, main power is cut off, street light 6 is off.

1.2 Sampling Isolation Circuit It consists of diodes of a common cathode. The cathode is connected to the sampling terminal FV3 of the leakage protection module FV. The anode of each diode is connected to each metal lamp and is protected by the protection body. The electrical function, the leakage signal can be transmitted from the leakage lamp pole to the module, but can not be transmitted to other poles, so that it can be reliable and smart, and it will not enlarge the leakage hazard, and it is convenient to check the fault point.

1.3 Leakage Protection Control Circuit This circuit consists of a leakage protection module FV and an AC contactor K2. The electromagnetic coil of K is connected to the line circuit of the normally closed contact in series connected to the main power supply 2 in series. , is the leakage protector technology core. It is a dedicated electronic switch developed by itself. When the sampling end wind 3 collects the leakage signal, it compares with the set reference voltage, amplifies and turns FV on, K2 acts and locks itself, K2 normally closed contact opens, "coil loses power, normally open contact breaks Turn on, cut off the leakage power supply, and achieve safety protection.

2 voltage type leakage protector malfunctions and refusal to solve the problem of malfunction and rejection, the essence is to improve the accuracy of the action of the voltage type leakage protector, "guarantee reliable operation. The conventional voltage type leakage protectors are all composed of electromagnetic components, and the performance of the electromagnetic components is unstable and the properties are not good. For reasons such as poor air gap accuracy, there are serious problems of malfunction and rejection. We use a QC contactor or relay as the actuator. On the basis of the electromagnetic component, an electronic control circuit, the aforementioned leakage protection module port, is added, as shown in Figure 2. It consists of an electronic switch [, voltage comparison.

Device A is composed of devices, and the forward input of the comparator is the sampling end of the module. When the leakage voltage is at the set reference voltage, the comparator is turned over and the output signal is turned on. The circuit shield is a very mature electronic circuit, which can greatly improve the accuracy of the action and meet the working requirements of the leakage protector. At this point, the problem of malfunction and rejection of the voltage type leakage device has been completely solved.

3 seats away from the problem roads are distributed on both sides of the street, every 30 or so, a switch box can control 250 盏, a switch cabinet can control 8~200 盏, the route is very long, can not be rooted every time the detection line, not It is possible to equip each lamp with a leakage protector. Therefore, it is necessary to use a root wire to detect a plurality of light poles. If the feed wires are directly connected to the respective light poles, the respective light poles will be turned on, and the light poles will leak. Will make all connected poles live, leaving 7 more hidden dangers.

We use the unidirectional conductive and leakage signal of the diode to be half-wave rectified, and then added to the sampling terminal FV3 of the leakage protection module. The isolation rectifier diodes of all the light poles can be connected in series, that is, parallel operation, and the light pole The diode between the pole and the pole becomes an anti-series circuit, so that the 7-drain protection module and the pole are electrically connected, and the pole and the pole are isolated from each other. The test results show that the rated leakage current of the leakage protector is 42. The rated leakage does not work for 21/break time is less than 013.

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