CN109975588B - Three-phase five-wire system rural area electricity larceny prevention device and method - Google Patents
Three-phase five-wire system rural area electricity larceny prevention device and method Download PDFInfo
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- CN109975588B CN109975588B CN201910361311.3A CN201910361311A CN109975588B CN 109975588 B CN109975588 B CN 109975588B CN 201910361311 A CN201910361311 A CN 201910361311A CN 109975588 B CN109975588 B CN 109975588B
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- 230000005611 electricity Effects 0.000 title claims abstract description 50
- 230000002265 prevention Effects 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 15
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 230000001012 protector Effects 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/04—Housings; Supporting racks; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/24—Arrangements for avoiding or indicating fraudulent use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/25—Arrangements for indicating or signalling faults
Abstract
The invention relates to an electricity larceny prevention device and method for a three-phase five-wire system rural area, and belongs to the technical field of electricity larceny prevention in rural areas. The technical proposal is as follows: a Z-shaped intelligent switch (4) is arranged in a distribution transformer station JP cabinet (1), an E-shaped intelligent switch (5) is arranged in an ammeter box, a single-core armoured insulating wire is adopted as a zero wire of a 0.4kV low-voltage overhead insulating wire made of three-phase five wires, an armoured layer is made of nonmagnetic metal, the armoured layer is grounded, and other wires are common insulating wires; the Z-shaped intelligent switch is directly connected to a 0.4kV low-voltage overhead insulated wire made of three-phase five wires; and an E-type intelligent switch in the ammeter box is connected with a 0.4kV low-voltage overhead insulated wire made of three-phase five wires. The beneficial effects of the invention are as follows: the illegal user private connection phenomenon is restrained, a safe electricity utilization environment is provided, the electricity stealing risk in rural areas is obviously reduced, and the line loss rate of the station area is effectively reduced.
Description
Technical Field
The invention relates to an electricity larceny prevention device and method for a three-phase five-wire system rural area, and belongs to the technical field of electricity larceny prevention in rural areas.
Background
Currently, urban residents mostly adopt a three-phase five-wire system (TN-S system), wherein five wires in the three-phase five-wire system refer to: 3 phase lines and one ground line and one zero line. The low-voltage power transmission mode with the widest application of low-voltage power supply in the general rural area is a three-phase four-wire system, three phase lines and zero lines are adopted for power supply, the zero lines are led out from a neutral point of a transformer and are grounded, the voltage is 380/220V, any phase line and zero line are taken to form a 220V power supply line for general household use, and the voltage among the three phase lines is 380V for general motor use. The three-phase five-wire system is one more ground wire than the three-phase four-wire system, and is used for places with higher safety requirements and equipment requirements of uniform grounding. China prescribes that the voltage between the phase lines (i.e. line voltage) of the civil power supply line is 380V, and the voltage between the phase lines and the ground line or neutral line (i.e. phase voltage) is 220V. The house lead-in wire generally adopts a single-phase two-wire system, namely any one phase of three phase wires and a neutral wire (serving as a zero wire). If the high-power electric appliance is encountered, the grounding wire needs to be arranged by oneself. The three-phase five-wire standard wire has the following colors: yellow on line A, green on line B, red on line C, light blue on line N, and yellow-green on line PE. The difference of electricity supply and sales in some rural areas is large, the line loss is too high, the electricity supply and use order is disordered, and the electricity stealing phenomenon is serious. The main manifestations are: firstly, taking a zero line and a fire line on a low-voltage overhead conductor through a metal hook or taking only the fire line on the low-voltage overhead conductor to be introduced into a residential building, and adopting a self-home zero line to steal electricity; secondly, the inside of the meter is damaged, shorted and changed, so that the meter cannot normally measure or the meter is inaccurate; thirdly, the lead wire is connected on the distribution area in a private way to steal electricity. The damage metering device can check and treat the user through on-site check, but the work of the power utilization check personnel is very little in face of a huge user group. Meanwhile, the private electricity larceny has the characteristic of irregular time and unfixed private grounding point, so that great difficulty is brought to striking electricity larceny.
Disclosure of Invention
The invention aims to provide a three-phase five-wire system rural area electricity larceny prevention device and method, which can be used for restraining illegal user private connection, providing a safe electricity utilization environment, obviously reducing the electricity larceny risk in rural areas, effectively reducing the line loss rate of a platform area and solving the problems in the background technology.
The technical scheme of the invention is as follows: a three-phase five-wire system rural area electricity larceny prevention device comprises a distribution transformer station JP cabinet, an electric meter box, a Z-shaped intelligent switch and an E-shaped intelligent switch, wherein the Z-shaped intelligent switch is installed in the distribution transformer station JP cabinet, the E-shaped intelligent switch is installed in the electric meter box, a single-core armoured insulating wire is adopted as a zero line of a 0.4kV low-voltage overhead insulating wire of the three-phase five-wire system, the wire consists of an outer sheath, an armouring layer, a main insulating layer and a wire core, the outer sheath, the armouring layer, the main insulating layer and the wire core are arranged from outside to inside, the armouring layer is made of nonmagnetic metal materials, the armouring layer is grounded, and other wires adopt common insulating wires.
The distribution transformer station JP cabinet, the Z-type intelligent switch and the E-type intelligent switch are all public equipment known in the art and are sold in the market.
The integrated power distribution cabinet of the distribution transformer is called as JP cabinet for short, and along with the continuous deep transformation of rural power grids, a large number of JP cabinets are applied to rural power lines and all power distribution areas. Z-type intelligent switches and E-type intelligent switches are also switching devices commonly used in the art.
The connecting wire of the Z-shaped intelligent switch in the distribution transformer station JP cabinet is directly connected to a 0.4kV low-voltage overhead insulated wire made of three-phase five wires, and wiring is carried out according to wiring requirements specified by the Z-shaped intelligent switch.
The E-type intelligent switch in the ammeter box has a leakage protection function, and is connected with a 0.4kV low-voltage overhead insulated wire of a three-phase five-wire system according to the wiring requirement specified by the E-type intelligent switch.
A three-phase five-wire system rural area electricity larceny prevention method comprises the following steps:
the power distribution transformer station JP cabinet is internally provided with a Z-shaped intelligent switch, the ammeter box is internally provided with an E-shaped intelligent switch, a zero line of a 0.4kV low-voltage overhead insulated wire made of three-phase five wires is a single-core armored insulated wire, an armor layer is made of nonmagnetic metal, the armor layer is grounded, and other wires are common insulated wires;
the connecting wire of the Z-shaped intelligent switch in the distribution transformer station JP cabinet is directly connected to a 0.4kV low-voltage overhead insulated wire made of three-phase five wires to form primary anti-electricity-theft protection; the E-type intelligent switch in the ammeter box has an electricity leakage protection function, and is connected with a 0.4kV low-voltage overhead insulated wire made of three-phase five wires according to the wiring requirement specified by the E-type intelligent switch to form a secondary electricity larceny prevention protection;
in the running process, if a user who steals electricity directly hangs and takes two-phase electricity on a low-voltage wire through a metal hook, the outer sheath of the armored zero wire is damaged, an armor layer is hung, a grounding loop is formed through the armor layer, a Z-type intelligent switch senses that the low-voltage power network has a grounding fault, and the switching-off operation is automatically carried out; if a user steals electricity, the user takes the live wire to introduce a private house on the low-voltage overhead conductor through the metal hook, and when the user steals electricity by adopting the home zero line, an electricity utilization loop is formed to bypass the E-shaped intelligent switch, so that the E-shaped intelligent switch with the electric leakage protection function can be caused to operate to switch off, and the illegal user private connection phenomenon is effectively restrained.
Separating an ammeter box main body and a control part of a three-phase five-wire rural area to respectively form an ammeter box main body and an ammeter box control box, arranging an E-type intelligent switch and various ammeter in the ammeter box main body, and arranging a household control switch in the ammeter box control box; the meter box main body is arranged at a higher position on the electric pole, and the meter box control box is arranged at a lower position on the electric pole.
A four-core armored cable is led out from the three-phase five-wire system, and is led into the meter box main body after penetrating through the protective sleeve; the connecting wire (the zero line and the fire wire of each household two phases) between the meter box main body and the meter box control box penetrates through the protective sleeve to be protected; the meter box main body is connected with the shell of the meter box control box through the shell grounding wire and is connected with the grounding electrode.
The beneficial effects of the invention are as follows: the illegal user private connection phenomenon is restrained, a safe electricity utilization environment is provided, the electricity stealing risk in rural areas is obviously reduced, and the line loss rate of the station area is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the wiring structure of the present invention;
FIG. 2 is a schematic diagram of the installation of an electric meter box of the present invention;
FIG. 3 is a schematic diagram of a Z-type intelligent switch employed in an embodiment of the present invention;
FIG. 4 is a schematic diagram of an E-type intelligent switch employed in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a Z-type intelligent switch installation according to an embodiment of the present invention; the method comprises the steps of carrying out a first treatment on the surface of the
FIG. 6 is a schematic diagram of an installation of a distribution transformer JP cabinet according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an embodiment of the present invention in a block diagram installation;
in the figure: distribution transformer station JP cabinet 1, table case main part 2, table case control box 3, Z intelligent switch 4, E intelligent switch 5, pole 6, four core armoured cable 7, connecting wire 8 between table case main part and the table case control box, casing earth connection 9, earthing pole 10, distribution transformer 11, steal electric user one 12, steal electric user two 13, A phase line L1, B phase line L2, C phase line L3, zero line N, earth connection PE, live wire L.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and the examples.
The utility model provides a rural area electricity larceny prevention device of three-phase five wires system, contain distribution transformer station JP cabinet 1, the ammeter case, Z type intelligent switch 4 and E type intelligent switch 5, install Z type intelligent switch in distribution transformer station JP cabinet, install E type intelligent switch in the ammeter case, the 0.4kV low pressure overhead insulated wire zero line of three-phase five wires system adopts single core armoured insulated wire, this wire comprises oversheath, armor, main insulating layer and sinle silk four parts, oversheath, armor, main insulating layer and sinle silk are by outside-in setting, the armor is nonmagnetic metal material, the armor is earthed, other wires adopt ordinary insulated wire.
The distribution transformer station JP cabinet, the Z-type intelligent switch and the E-type intelligent switch are all public equipment known in the art and are sold in the market.
The integrated power distribution cabinet of the distribution transformer is called as JP cabinet for short, and along with the continuous deep transformation of rural power grids, a large number of JP cabinets are applied to rural power lines and all power distribution areas. Z-type intelligent switches and E-type intelligent switches are also switching devices commonly used in the art.
The connecting wire of the Z-shaped intelligent switch in the distribution transformer station JP cabinet is directly connected to a 0.4kV low-voltage overhead insulated wire made of three-phase five wires, and wiring is carried out according to wiring requirements specified by the Z-shaped intelligent switch.
The E-type intelligent switch in the ammeter box has a leakage protection function, and is connected with a 0.4kV low-voltage overhead insulated wire of a three-phase five-wire system according to the wiring requirement specified by the E-type intelligent switch.
A three-phase five-wire system rural area electricity larceny prevention method comprises the following steps:
the power distribution transformer station JP cabinet 1 is internally provided with a Z-shaped intelligent switch 4, the ammeter box is internally provided with an E-shaped intelligent switch 5, a zero sequence wire of a 0.4kV low-voltage overhead insulating wire made of three-phase five wires adopts a single-core armoured insulating wire, an armoured layer is made of nonmagnetic metal, the armoured layer is grounded, and other wires adopt common insulating wires;
the connecting wire of the Z-shaped intelligent switch in the distribution transformer station JP cabinet is directly connected to a 0.4kV low-voltage overhead insulated wire made of three-phase five wires to form primary anti-electricity-theft protection; the E-type intelligent switch in the ammeter box has an electricity leakage protection function, and is connected with a 0.4kV low-voltage overhead insulated wire made of three-phase five wires according to the wiring requirement specified by the E-type intelligent switch to form a secondary electricity larceny prevention protection;
in the operation process, if a first electricity stealing user 12 directly hangs and takes two-phase electricity on a low-voltage wire through a metal hook, an armor zero-wire outer sheath is damaged, an armor layer is hung, a grounding loop is formed through the armor layer, a Z-type intelligent switch senses that a grounding fault occurs in a low-voltage power grid, and a brake separating operation is automatically carried out; if the second electricity stealing user 13 takes the live wire to introduce into a residential house on the low-voltage overhead conductor through the metal hook, when electricity stealing is carried out by adopting the home zero line, an electricity consumption loop is formed to bypass the E-shaped intelligent switch, and the E-shaped intelligent switch with the electricity leakage protection function is caused to operate to break the gate, so that the illegal user private connection phenomenon is effectively restrained.
Separating an ammeter box main body and a control part of a three-phase five-wire rural area to form a ammeter box main body 2 and a ammeter box control box 3 respectively, arranging an E-type intelligent switch 5 and various ammeter in the ammeter box main body, and arranging a household control switch in the ammeter box control box; the main body of the meter box is arranged at a higher position on the electric pole, and the control box of the meter box is arranged at a lower position on the electric pole 6.
A four-core armored cable 7 is led out from the three-phase five-wire system, and is led into the meter box main body after penetrating through the protective sleeve; a connecting wire 8 (a zero line and a fire line of each household two phases) between the meter box main body and the meter box control box adopts a bunched cable; the meter box main body and the housing of the meter box control box are connected through a housing grounding wire 9 and are connected with a grounding electrode 10.
In the examples:
the zero line of the 0.4kV low-voltage overhead insulated wire made of three-phase five wires adopts a single-core armored insulated wire, the wire consists of an outer sheath, an armor layer, a main insulating layer and a wire core, the armor layer is made of nonmagnetic metal, the armor layer is grounded, and other wires adopt common insulated wires. The PE line in fig. 1 is the metal armor layer outside the zero line.
Z-type intelligent switch:
the manufacturing factory: zhejiang Yian power electronics Co.Ltd
Equipment model: EA3-6/630
The main functions are as follows:
1. the Z-type intelligent switch adopts a base core of a high breaking type molded case circuit breaker, and has the characteristics of compact structure and high breaking capacity;
2. the protection functions of overload, short circuit, open phase, overvoltage, undervoltage, residual current, specific electric shock and the like are integrated, and automatic reclosing is integrated;
3. the load current, the voltage, the residual current and the phase of each phase can be displayed;
4. the electric shock protection function is not affected by the leakage current of the circuit. In most cases, the trip protection can be achieved under 50mA in accordance with a specific electric shock waveform;
5. the working load current can be adjusted and set according to the capacity of the transformer in the transformer area, so that the transformer cannot be burnt out due to overload of the load, and the working load current can also be used as a load control switch;
6. the residual current action value is multi-gear adjustable;
7. the anti-interference capability is strong, a multi-stage lightning protection circuit is adopted, surge voltage can be effectively restrained, lightning is induced, various tip interferences are eliminated, and the operation is stable and reliable;
8. the breaking time is adjustable. The total protection of the station area can be set at 0.3s, and the secondary protection can be set at 0.2s, so that the phenomenon of override trip and simultaneous trip can not occur;
9. the leakage alarm function is used for checking the leakage fault of the circuit or not allowing a power failure place;
10. each time the fault trips, the phase, the numerical value and the tripping reason can be displayed, and the latest 64 fault tripping records are automatically memorized.
The Z-type intelligent switch is arranged in the distribution transformer station JP cabinet and used as primary leakage protection of a station area, namely when the current in and out of a loop is unbalanced, the Z-type intelligent switch trips.
The zero sequence wire of the low-voltage overhead insulated wire adopts a single-core armored insulated wire, the armor layer is made of nonmagnetic metal, and the armor layer is grounded; the other leads are common insulated leads. When a user who steals electricity directly hangs and takes two-phase electricity on a low-voltage wire through a metal hook in the operation process, the armored zero wire is damaged, the ground wire and the zero wire are connected, the Z-type intelligent switch senses that the low-voltage power network has a ground fault, and the switching-off operation is automatically performed.
E-type intelligent switch:
the manufacturing factory: zhejiang Yian power electronics Co.Ltd
Equipment model: EA3-6F
The main functions are as follows:
1. the protection functions of overload, short circuit, electric leakage, overvoltage, undervoltage, power failure and the like are integrated, and manual and automatic reclosing is integrated;
2. the working load current can be set according to the capacity of the transformer in the transformer area, so that the transformer cannot be burnt out due to overload, and the working load current can also be used as a load control switch;
3. the liquid crystal screen is adopted, so that the current voltage, current, real-time residual current and other parameter information can be displayed;
4. the residual current action value is multi-gear adjustable, and the residual current action gear value can be reasonably selected according to the leakage current of the installation circuit;
5. the anti-interference capability is strong, a multi-stage lightning protection circuit is adopted, surge voltage can be effectively restrained, lightning is induced, various tip interferences are eliminated, and the operation is stable and reliable;
6. the breaking time is adjustable. The device can form action time level difference with the upper and lower level protectors to realize hierarchical protection, and the override trip and simultaneous trip phenomena can not occur;
7. the protector power supply side voltage faults (under voltage, overvoltage and power failure) are subjected to opening protection, and the protector is automatically switched on when the power is turned on or the voltage is recovered to be normal;
8. and the leakage alarming function is used for line leakage fault maintenance or a place where power failure is not allowed. The device is also provided with a voice module, and when the leakage is blocked, a voice prompt is sent out;
9. each time of fault tripping can display numerical value, tripping reason and occurrence time, automatically memorize the latest fault tripping record (19 times at most) and can be checked by keys;
10. the device is provided with an external control interface, and can be used for remote switching on and off;
11. automatically counting the operation time of the protector;
12. the product is provided with an RS-485 communication port, and is internally provided with a LORA wireless communication module (optional matching), and the intelligent digital control technology is adopted, so that the networked management and the remote monitoring can be realized.
Claims (1)
1. A three-phase five-wire system rural area electricity larceny prevention method is characterized by comprising the following steps: a Z-shaped intelligent switch (4) is arranged in a distribution transformer station JP cabinet (1), an E-shaped intelligent switch (5) is arranged in an ammeter box, a zero sequence wire of a 0.4kV low-voltage overhead insulating wire made of three-phase five wires adopts a single-core armoured insulating wire, an armoured layer is made of nonmagnetic metal, the armoured layer is grounded, and other wires adopt common insulating wires;
the connecting wire of the Z-shaped intelligent switch in the distribution transformer station JP cabinet is directly connected to a 0.4kV low-voltage overhead insulated wire made of three-phase five wires to form primary anti-electricity-theft protection; the E-type intelligent switch in the ammeter box has an electricity leakage protection function, and is connected with a 0.4kV low-voltage overhead insulated wire made of three-phase five wires according to the wiring requirement specified by the E-type intelligent switch to form a secondary electricity larceny prevention protection;
in the operation process, if a first electricity stealing user (12) directly hangs and takes two-phase electricity on a low-voltage wire through a metal hook, an armor zero-wire outer sheath is damaged, an armor layer is hung, a grounding loop is formed through the armor layer, a Z-type intelligent switch detects that the grounding current occurs in a low-voltage power grid, and the switching-off operation is automatically carried out; if a second electricity stealing user (13) is hung on the low-voltage overhead wire through a metal hook to take a live wire to be introduced into a residential building, when electricity stealing is carried out by adopting a home zero line, an electricity consumption loop is formed to bypass an E-type intelligent switch, and the E-type intelligent switch with an electricity leakage protection function is caused to operate to switch off, so that illegal user private connection is effectively restrained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910361311.3A CN109975588B (en) | 2019-04-30 | 2019-04-30 | Three-phase five-wire system rural area electricity larceny prevention device and method |
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| CN201910361311.3A CN109975588B (en) | 2019-04-30 | 2019-04-30 | Three-phase five-wire system rural area electricity larceny prevention device and method |
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| CN109975588B true CN109975588B (en) | 2023-12-05 |
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