CN209878852U - A three-phase five-wire system anti-theft electric meter box structure in rural areas - Google Patents

Abstract

The utility model relates to a three-phase five-wire anti-stealing electric meter box structure in rural areas, which belongs to the technical field of anti-stealing electricity in rural areas. The technical solution is: separate the main body of the meter box and the control part of the three-phase five-wire rural area to form the main body of the meter box (2) and the control box (3), the E-type intelligent switch (5) and various types of meters Set it in the main body of the meter box, and set the household control switch in the meter box control box; install the main body of the meter box on the higher position on the pole, and install the meter box control box on the lower part of the pole (6) Location. The beneficial effects of the utility model are: curbing illegal users' private connection, providing a safe environment for using electricity, significantly reducing the risk of stealing electricity in rural areas, and effectively reducing the line loss rate in station areas.

Description

A three-phase five-wire system anti-theft electric meter box structure in rural areas

technical field

The utility model relates to a three-phase five-wire anti-stealing electric meter box structure in rural areas, which belongs to the technical field of anti-stealing electricity in rural areas.

Background technique

At present, urban residents mostly use the three-phase five-wire system (TN-S system). The five-wire system in the three-phase five-wire system refers to: 3 phase wires plus a ground wire and a neutral wire. Generally, the most widely used low-voltage power transmission method in rural low-voltage power supply is the three-phase four-wire system, which uses three phase wires plus a neutral wire for power supply. The neutral wire is drawn from the neutral point of the transformer and grounded, and the voltage is 380/220V. Adding a neutral line constitutes a 220V power supply line for general household use, and the voltage between the three phase lines is 380V, which is used by general power supply machines. The three-phase five-wire system has one more ground wire than the three-phase four-wire system, which is used in places with higher safety requirements and uniform grounding of equipment. China stipulates that the voltage between the phase lines of civil power supply lines (ie, line voltage) is 380V, and the voltage between phase lines and ground wires or neutral lines (ie, phase voltage) is 220V. The incoming line generally adopts a single-phase two-wire system, that is, any one of the three phase lines and the neutral line (as a neutral line). In case of high-power electrical appliances, you need to set the grounding wire by yourself. The standard wire colors of the three-phase five-wire system are: A wire is yellow, B wire is green, C wire is red, N wire is light blue, and PE wire is yellow-green. In some rural areas, there is a large gap between supply and sale of electricity, high line loss, disorder in power supply and consumption, and serious electricity theft. The main manifestations are: destroying, short-circuiting, and modifying the inside of the meter, resulting in the meter not being able to measure normally or measuring inaccurately. Destroying metering devices and stealing electricity can investigate and deal with users through on-site inspections, but in the face of a huge user group, the work of electricity inspectors has little effect. At the same time, due to the characteristics of irregular timing and unfixed private grounding point, it brings great difficulty to the work of combating electricity theft.

Utility model content

The purpose of the utility model is to provide a three-phase five-wire anti-theft electric meter box structure in rural areas, to curb the phenomenon of private connection of illegal users, to provide a safe environment for electricity use, to significantly reduce the risk of electricity theft in rural areas, and to effectively reduce the line loss in the station area rate, to solve the above-mentioned problems in the background technology.

The technical scheme of the utility model is: a three-phase five-wire rural area anti-stealing electric meter box structure, which separates the main body of the electric meter box and the control part of the three-phase five-wire rural area to form the main body of the meter box and the meter box respectively. The box control box, the E-type intelligent switch and various electric meters are set in the main body of the meter box, and the household control switch is set in the meter box control box; the main body of the meter box is installed at a higher position on the pole, and the meter box is controlled The box is installed at a lower position on the pole.

The E-type intelligent switch in the meter box has the leakage protection function, and is connected with the three-phase five-wire 0.4kV low-voltage overhead insulated conductor according to the wiring requirements specified by the E-type intelligent switch.

The four-core armored cable is led out of the three-phase five-wire system, and is introduced into the main body of the meter box after passing through the protective sleeve; the connecting line between the main body of the meter box and the control box of the meter box (two-phase zero line and live wire for each household) adopts cluster cables; The main body of the meter box and the casing of the meter box control box are connected through the casing ground wire and connected to the ground electrode.

The beneficial effects of the utility model are: curbing illegal users' private connection, providing a safe environment for using electricity, significantly reducing the risk of stealing electricity in rural areas, and effectively reducing the line loss rate in station areas.

Description of drawings

Fig. 1 is a schematic diagram of the wiring structure of the additional intelligent switch of the present invention;

Fig. 2 is the installation schematic diagram of the embodiment of the utility model;

Figure 3 is a schematic diagram of the installation of the JP cabinet of the power distribution substation according to the embodiment of the present invention;

In the figure: distribution substation JP cabinet 1, meter box main body 2, meter box control box 3, Z-type smart switch 4, E-type smart switch 5, electric pole 6, four-core armored cable 7, meter box main body and meter Connection wire 8 between control boxes, case ground wire 9, ground electrode 10, distribution transformer 11, power stealing user 1 12, power stealing user 2 13, A phase line L1, B phase line L2, C phase line L3, neutral wire N, ground wire PE, live wire L.

Detailed ways

The technical solution of the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

A three-phase five-wire anti-theft meter box structure in rural areas. The main body of the three-phase five-wire rural area is separated from the control part to form the main body 2 of the meter box and the control box 3 of the meter box. Type E The smart switch 5 and various electric meters are arranged in the main body of the meter box, and the household control switch is arranged in the meter box control box; the main body of the meter box is installed at a higher position on the pole, and the meter box control box is installed on the pole 6 on the lower position.

The E-type intelligent switch in the meter box has the leakage protection function, and is connected with the three-phase five-wire 0.4kV low-voltage overhead insulated conductor according to the wiring requirements specified by the E-type intelligent switch.

The four-core armored cable 7 is led out of the three-phase five-wire system, and is introduced into the main body of the meter box after passing through the protective sleeve; the connecting line 8 (the zero line and the live wire of each two-phase two-phase line of each household) between the main body of the meter box and the control box of the meter box is worn through the protection The casing is used for protection; the main body of the meter box and the casing of the meter box control box are connected through the casing ground wire 9 and connected to the ground electrode 10 .

In order to prevent the two-phase electricity from being directly hung on the low-voltage line through the metal hook and the live wire from the low-voltage overhead wire through the metal hook to be introduced into the house, the zero line of the home is used to steal electricity; the utility model also includes the power distribution substation JP Cabinet 1, meter box and Z-type intelligent switch 4, Z-type intelligent switch is installed in the distribution transformer JP cabinet, E-type intelligent switch is installed in the meter box, 0.4kV low-voltage overhead insulated wire zero line of three-phase five-wire system Single-core armored insulated wire is used. The wire is composed of four parts: outer sheath, armored layer, main insulating layer and wire core. The outer sheath, armored layer, main insulating layer and wire core are set from outside to inside. The layer is made of non-magnetic metal material, the armored layer is grounded, and the other wires are ordinary insulated wires. The PE line in Figure 1 is the metal armor layer outside the zero line.

The power distribution substation JP cabinet, the Z-type intelligent switch and the E-type intelligent switch involved in the utility model are all well-known and public equipment in the art, and are all sold on the market.

Distribution transformer integrated power distribution cabinet is referred to as JP cabinet for short. With the continuous deepening of rural power grid transformation, a large number of JP cabinets are used in rural power lines and distribution stations. Z-type smart switch and E-type smart switch are also commonly used switching devices in this field.

The connection line of the Z-type intelligent switch in the JP cabinet of the power distribution substation is directly connected to the 0.4kV low-voltage overhead insulated conductor of the three-phase five-wire system, and the wiring is performed according to the wiring requirements specified by the Z-type intelligent switch.

During the operation, if there is a situation where the power-stealing user-12 directly connects the low-voltage line to the two-phase power through the metal hook, destroy the outer sheath of the armored neutral line, connect the armor layer, and form a grounding loop through the armor layer, Z The type intelligent switch senses the grounding fault of the low-voltage power grid, and automatically performs the opening operation; if the electricity-stealing user 213 hangs on the low-voltage overhead wire through a metal hook and takes the live wire to lead into the house, and uses its own neutral wire to steal electricity, it will cause electricity consumption. The loop bypassing the E-type smart switch will lead to the opening operation of the E-type smart switch with leakage protection function, thus effectively curbing the phenomenon of illegal user private connection.

In the example:

Z type smart switch:

Manufacturer: Zhejiang Yian Power Electronics Technology Co., Ltd.

Device model: EA3-6/630

The main function:

1. The Z-type intelligent switch adopts the base movement of the high-breaking molded case circuit breaker, which has the characteristics of compact structure and high breaking capacity;

2. Integrate protection functions such as overload, short circuit, phase loss, overvoltage, undervoltage, residual current, specific electric shock and automatic reclosing;

3. It can display the load current of each phase, the voltage of each phase, the residual current and the phase;

4. The electric shock protection function is not affected by the leakage current of the line. In most cases, the trip protection can be tripped below 50mA in accordance with the specific electric shock waveform;

5. The working load current can be adjusted and set according to the capacity of the transformer in the station area, so that the transformer will not be burned due to overload, and it can also be used as a load control switch;

6. The residual current action value can be adjusted in multiple gears.

7. Strong anti-interference ability, adopting multi-level lightning protection circuit, which can effectively suppress surge voltage and induced lightning, eliminate various cutting-edge interference, and run stably and reliably.

8. The breaking time is adjustable. It can be set at 0.3s for the general protection of the station area, and can be set at 0.2s for the secondary protection, and there will be no leapfrog tripping and simultaneous tripping;

9. Leakage alarm function, used for line leakage fault inspection or where power outages are not allowed;

10. The phase, value and trip reason can be displayed for each fault trip, and the latest 64 fault trip records can be automatically memorized.

The Z-type intelligent switch is installed in the JP cabinet of the power distribution substation, as the first-level leakage protection of the station area, that is, when the incoming and outgoing currents of the circuit are unbalanced, the Z-shaped intelligent switch trips.

The zero-sequence line of low-voltage overhead insulated conductors adopts single-core armored insulated wires, the armored layer is made of non-magnetic metal material, and the armored layer is grounded; other wires use ordinary insulated wires. In the process of operation, when the electricity-stealing user directly hooks the two-phase power on the low-voltage line through the metal hook, the armored neutral line is damaged, the ground line and the neutral line are connected, and the Z-type smart switch senses a ground fault in the low-voltage power grid. Automatic opening operation.

E-type smart switch:

Manufacturer: Zhejiang Yian Power Electronics Technology Co., Ltd.

Device model: EA3-6F

The main function:

1. Integrate overload, short circuit, leakage, overvoltage, undervoltage, power failure and other protection functions and manual and automatic reclosing in one;

2. The working load current can be set according to the capacity of the transformer in the station area, so that the transformer will not be burned due to overload, and it can also be used as a load control switch;

3. Adopt LCD screen, which can display the current voltage, current, real-time residual current and other parameter information.

4. The residual current action value can be adjusted in multiple gears, and the residual current action gear value can be reasonably selected according to the leakage current of the installation line;

5. Strong anti-interference ability, adopting multi-level lightning protection circuit, which can effectively suppress surge voltage and induced lightning, eliminate various cutting-edge interference, and run stably and reliably;

6. The breaking time is adjustable. It can form an action time difference with the upper and lower protectors to realize hierarchical protection, and there will be no leapfrog tripping and simultaneous tripping;

7. The voltage fault (undervoltage, overvoltage, power failure) on the power supply side of the protector is opened for protection, and the protector automatically closes when the power comes in or the voltage returns to normal;

8. Leakage alarm function, used for line leakage fault maintenance or places where power outages are not allowed. And equipped with a voice module, when the leakage is locked, a voice prompt will be issued;

9. Each fault trip can display the value, the cause of the trip and the time of occurrence, and automatically memorize the latest fault trip record (up to 19 times), which can be checked by pressing the button;

10. With an external control interface, it can be opened and closed remotely.

11. Automatically count the operation time of the protector;

12. The product is equipped with RS-485 communication port, and built-in LORA wireless communication module (optional), adopts intelligent digital control technology, which can realize network management and remote monitoring.

Claims (2)

1. A three-phase five-wire rural area anti-stealing electric meter box structure, characterized in that: the main body of the three-phase five-wire rural area is separated from the control part to form the main body (2) and the control part of the meter box respectively. The meter box control box (3), the E-type intelligent switch (5) and various electric meters are set in the meter box main body, and the household control switch is set in the meter box control box; the meter box body is installed on the pole Install the meter box control box at the lower position on the pole (6). 2. A three-phase five-wire anti-theft electric meter box structure in rural areas according to claim 1, characterized in that four-core armored cables (7) are led out from the three-phase five-wire system and worn through protective sleeves Then introduce the main body of the meter box; the connection line (8) between the main body of the meter box and the control box of the meter box adopts bundled cables; the main body of the meter box and the shell of the control box of the meter box are connected through the shell grounding wire (9), Ground electrode (10) connection.