CN112305288A - Electric energy meter box - Google Patents
Electric energy meter box Download PDFInfo
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- CN112305288A CN112305288A CN202011478229.8A CN202011478229A CN112305288A CN 112305288 A CN112305288 A CN 112305288A CN 202011478229 A CN202011478229 A CN 202011478229A CN 112305288 A CN112305288 A CN 112305288A
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- 230000001012 protector Effects 0.000 claims abstract description 129
- 230000005611 electricity Effects 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 54
- 238000012360 testing method Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 230000033228 biological regulation Effects 0.000 description 4
- 238000007726 management method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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Abstract
The invention discloses an electric energy meter box, relating to the technical field of electric power metering equipment, in particular to an electric energy meter box, which comprises: metering device, voltage transformer and current transformer respectively with the metering device electricity is connected, still includes: the meter box comprises a meter box body and an overcurrent protector, wherein the overcurrent protector is fixedly arranged inside the meter box body. The meter box has the advantages that the overcurrent protector is arranged in the meter box body, the wiring of the voltage transformer and the metering device is verified through the state of the overcurrent protector, when the wiring is wrong, the overcurrent protector is broken to protect the voltage transformer from being burnt, and workers can find out the occurrence point of the wiring mistake through the communication state of the overcurrent protector, so that the checking work efficiency is improved. When the wiring is correct, the overcurrent protector can be detached, and the metering device is put into use.
Description
Technical Field
The invention relates to the technical field of electric power metering equipment, in particular to an electric energy meter box.
Background
According to the regulations of DL/T448-. This provision applies primarily to the substation mode.
For the high-voltage electric energy metering device of the special transformer with the voltage of 35kV or below, an auxiliary contact of an isolating switch and a fuse are not installed on a secondary loop of the electric energy metering device.
The invention discloses an authorized publication number CN201535787U, which is named as a low-voltage comprehensive metering device box of a 10kV distribution transformer, and discloses a meter box, which consists of a box body and an insulating partition plate and is characterized in that: the box body is provided with a front door and a rear door, hinges are arranged in the front door and the rear door, and an anti-theft coded lock and lead sealing are additionally arranged; the product is a metering box capable of accurately metering the power load of a distribution transformer, meets the requirements of technical management regulations DL448-2000 of the electric energy metering device, is suitable for metering devices for checking the line loss of transformers in power stations with the capacity of 10 kilovolts 500kVA or below and users, and has the advantages of small volume, light weight, convenient installation, safety, reliability, low manufacturing cost, good anti-theft performance and wide usability.
The invention provides a low-voltage comprehensive metering device box of a 10KV distribution transformer, which adopts a comprehensive metering box with an integral structure, can reduce the electric quantity consumption among metering instruments, and enables the integral measurement error of the metering instruments to meet the requirements of technical management regulations of electric energy metering devices DL 448-2000. The novel low-voltage comprehensive metering box is used for transmitting the power consumption into the power consumption MIS system through the 485 interface of the electric energy meter and the load control device, so that the power consumption is checked by a meter reading person, the qualification rate of reading, checking and accepting is improved, and the purposes of metering management informatization and power quantity examination are achieved. The product can be used for facilitating metering and calibrating personnel to carry out on-site calibration of the electric energy meter and periodic rotation of equipment, and can flexibly adjust the size of load, thereby solving the problem that the metering device needs to be replaced when a transformer is replaced in the past and reducing the cost of power utilization enterprises. The reliability of the safe operation of the metering equipment is improved.
The patent and the present application are applications in the same technical field, but obviously different in terms of the problems to be solved and the technical solutions to be adopted.
Granted publication No. CN101685147B, patent name: the invention discloses a device and a method for simulating field electric energy metering test. The simulated on-site electric energy metering test device is a novel simulation device designed according to the national relevant electric energy meter site standard and the requirements of DL/T448-2000, and is divided into a real load part and a virtual load part in principle, wherein the real load part consists of a current transformer, a voltage transformer, secondary wiring of the current transformer and an electric energy meter, is a single-bus double-loop circuit and can simulate various actual wiring on site, so that the accuracy and the reliability of electric energy metering are ensured, and meanwhile, the hidden danger brought to the safe operation of an electric power system is also avoided. The virtual load part is composed of a three-phase program-controlled test power supply and a voltage and current wiring switching box, has the characteristics of good stability, strong function, convenient use and the like, and can be used for power supply departments, metering departments, schools and training centers to explain the practical phenomena of three-phase three-wire, three-phase four-wire active and reactive electric energy meter miswiring and the like to students, so that the teaching of the virtual load part is closer to the practical work.
The invention provides a simulated field electric energy metering test device which is used for teaching experiments, and does not provide a specific solution and inspiration for solving the problem of avoiding the problem caused by false wiring in the wiring process.
Disclosure of Invention
The invention provides an electric energy meter box which is used for solving the problem that a mutual inductor is burnt down due to manual wiring errors in the prior art.
The invention adopts the following technical scheme:
an electrical energy meter box comprising: metering device, voltage transformer and current transformer respectively with the metering device electricity is connected, still includes: the meter box comprises a meter box body and an overcurrent protector, wherein the overcurrent protector is fixedly arranged inside the meter box body, one end of the overcurrent protector is electrically connected with the secondary side of the voltage transformer, and the other end of the overcurrent protector is electrically connected with the metering device.
Further, the voltage transformer includes: the transformer comprises a first winding, a second winding, a first connecting point, a second connecting point and a third connecting point, wherein the first connecting point is electrically connected with the same-name end of the secondary side of the first winding, the second connecting point is electrically connected with the non-same-name end of the secondary side of the first winding and the same-name end of the secondary side of the second winding, the third connecting point is electrically connected with the non-same-name end of the secondary side of the second winding, and the second connecting point is grounded.
Further, the current transformer includes: the winding structure comprises a third winding, a fourth connecting point, a fifth connecting point, a sixth connecting point and a seventh connecting point, wherein the fourth connecting point is electrically connected with the homonymous end of the third winding, the fifth connecting point is electrically connected with the non-homonymous end of the third winding, the sixth connecting point is electrically connected with the homonymous end of the fourth winding, the seventh connecting point is electrically connected with the non-homonymous end of the fourth winding, and the fifth connecting point and the seventh connecting point are grounded.
Further, the overcurrent protector includes: the circuit breaker comprises a circuit breaker body and a fuse.
Further, still include: the connecting piece module is fixedly arranged inside the meter box body, the voltage transformer and the current transformer are respectively connected with the metering device through the connecting piece module, and the overcurrent protector is connected with the connecting piece in parallel.
Further, the tab module includes: insulating seat, first binding post, second binding post and conducting strip, first binding post and second binding post is fixed the setting respectively is in the both ends of insulating seat, the conducting strip both ends respectively with first binding post and second binding post can dismantle the connection.
Furthermore, one end of the overcurrent protector is electrically connected with the second connection point, and the other end of the overcurrent protector is electrically connected with the metering device.
Further, the overcurrent protector comprises a first overcurrent protector and a second overcurrent protector, one end of the first overcurrent protector is electrically connected with the first connecting point, the other end of the first overcurrent protector is electrically connected with the metering device, one end of the second overcurrent protector is electrically connected with the third connecting point, and the other end of the second overcurrent protector is electrically connected with the metering device.
Further, the overcurrent protector further comprises: and the circuit breaking indicator lamp is used for indicating the communication state of the circuit breaking body and is connected with the circuit breaking body in parallel.
Further, the disconnection indicating lamp includes: the LED circuit breaker comprises a current-limiting resistor and an LED, wherein one end of the current-limiting resistor is electrically connected with a first end of the circuit breaker body, the other end of the current-limiting resistor is electrically connected with an anode of the LED, and a cathode of the LED is electrically connected with a second end of the circuit breaker body.
The invention has the following positive effects:
an electrical energy meter box comprising: metering device, voltage transformer and current transformer respectively with the metering device electricity is connected, still includes: the meter box comprises a meter box body and an overcurrent protector, wherein the overcurrent protector is fixedly arranged inside the meter box body.
The meter box has the advantages that the overcurrent protector is arranged in the meter box body, the wiring of the voltage transformer and the metering device is verified through the state of the overcurrent protector, when the wiring is wrong, the overcurrent protector is broken to protect the voltage transformer from being burnt, and workers can find out the occurrence point of the wiring mistake through the communication state of the overcurrent protector, so that the checking work efficiency is improved. When the wiring is correct, the overcurrent protector can be detached, the metering device is put into use, the overcurrent protector does not exist, and the metering precision is higher. The overcurrent protector is arranged inside the meter box body, so that the overcurrent protector is not required to be found at present, and the wiring is more convenient.
The meter box is particularly suitable for VV-wired voltage transformers, and the VV-wired voltage transformers usually have a protective grounding point for safety, and the grounding point is one of the reasons that workers are easy to operate by mistake to cause the voltage transformers to be burnt. The over-current protector for test run wiring is arranged in the meter box body of the meter box, the over-current protector is connected into the metering device during wiring, and the over-current protector is removed to be put into operation formally after no problem is found in test run. The voltage transformer burnout condition caused by the error of workers is effectively avoided.
The main body of the overcurrent protector of the meter box is a circuit breaker body, two possible implementation modes of the circuit breaker body are a circuit breaker or a fuse, the circuit breaker is more convenient to use, the circuit breaker is closed in test operation, namely, the circuit breaker is put into use, if mis-wiring occurs, the overcurrent protection function of the circuit breaker causes the circuit breaker to be disconnected, and the overcurrent protection function is realized. The application of the method has the advantages that after the fault is eliminated, the method can be repeatedly used when the system is operated in a trial mode again, and the method has the defect of high cost. The fuse is connected to a circuit before use, when misconnection occurs, the fuse is fused due to overlarge current, after the fault is eliminated, and when the fuse is tried to operate again, the fuse needs to be replaced by a new fuse.
The connecting piece module of the meter box is in modular design and comprises the insulating base, the first connecting terminal, the second connecting terminal and the conducting piece, so that the overcurrent protector can be conveniently connected and detached, the conducting piece can be conveniently connected, and convenience is brought to test operation. After the trial operation is finished and the test operation is put into operation formally, the conducting strip is connected, the conducting strip has small on-resistance, the voltage drop flowing through the connecting strip module is small enough, the influence on the metering precision is small, and the condition of the metering module is met.
The meter box provides two overcurrent protector setting modes of the voltage transformers aiming at VV wiring, one mode is that the overcurrent protector is electrically connected with the second connecting point, and secondary side coils of the two voltage transformers are protected by one overcurrent protector. The other overcurrent mode is that the first overcurrent protector is electrically connected with the first connecting point, the second overcurrent protector is electrically connected with the third connecting point, the two independent overcurrent protectors respectively protect the two secondary coils of the voltage transformer, and the mode can judge which coil is in wiring problem from the open circuit state of the overcurrent protector, so that the fault can be more conveniently checked.
The overcurrent protector of the meter box is provided with the circuit breaking indicator lamp, when the circuit breaking body of the overcurrent protector is broken, the circuit breaking indicator lamp is turned on to indicate the state of the circuit breaking body, a worker can visually observe whether the voltage transformer is correctly wired, the working efficiency is higher, and the difficulty in troubleshooting is smaller.
Drawings
FIG. 1 is an electrical schematic diagram of an embodiment of the present invention employing two over-current protectors;
FIG. 2 is an electrical schematic of an embodiment of the present invention employing an overcurrent protector;
fig. 3 is a structural view of a connection piece module according to an embodiment of the present invention.
In the figure:
a metering device D1;
a first winding L1;
a second winding L2;
a first connection point P1;
a second connection point P2;
a third connection point P3;
a third winding L3;
a fourth winding L4;
a fourth connection point P4;
a fifth connection point P5;
a sixth connection point P6;
a seventh connection point P7;
an insulating base 1;
a first connection terminal 2;
a second connection terminal 3;
a conductive sheet 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, an electric energy meter case includes: metering device D1, voltage transformer and current transformer with metering device D1 electricity respectively is connected, still includes: the meter box comprises a meter box body and an overcurrent protector, wherein the overcurrent protector is fixedly arranged inside the meter box body, one end of the overcurrent protector is electrically connected with the secondary side of the voltage transformer, and the other end of the overcurrent protector is electrically connected with the metering device D1.
More specifically, for the high voltage metering device D1, a voltage transformer is generally used to obtain a voltage signal, a current transformer is used to obtain a current signal, and the metering device D1 calculates electricity consumption data including active power, reactive power and total electric energy consumption through the voltage signal of the voltage transformer and the current signal of the current transformer.
According to the regulations of DL/T448-. This provision applies primarily to the substation mode.
The application principle of the voltage transformer is that the voltage transformer for the electric energy metering device D1 is generally low in secondary circuit voltage, the voltage transformer provided with an auxiliary contact of a disconnecting switch and a fuse is additionally arranged, the auxiliary contact of the disconnecting switch or the fuse can generate certain voltage drop on the auxiliary contact of the disconnecting switch or the fuse, and the voltage drop is not negligible relative to the voltage transformer secondary circuit voltage, so that the metering accuracy of the electric energy metering device D1 is influenced.
Usually, a secondary circuit of the voltage transformer is directly and electrically connected with the electric energy metering device D1, and an auxiliary contact and a fuse of a switch are not added in the middle, so that the metering precision of the electric energy metering device D1 is effectively ensured.
When the electric energy metering device D1 is verified or overhauled, the electric energy metering device D1 is usually required to be detached, and reinstalled and debugged after the operation is completed.
However, due to the characteristics of the voltage transformer, the voltage transformer cannot be short-circuited, and the current transformer cannot be open-circuited, so that an inexperienced worker can cause inevitable loss of the voltage transformer due to negligence: if when the wiring, the wiring is wrong, and the voltage transformer secondary circuit short circuit, as mentioned above, the voltage transformer secondary circuit does not insert fuse or isolator auxiliary contact to lead to voltage transformer to burn out.
The invention is an improvement of the prior art, and the output end of the secondary side of the voltage transformer is provided with an overcurrent protector which is a device for protecting an electric appliance by opening a circuit when the rated current is exceeded.
When the device is used, before wiring, the output end of a target voltage transformer is connected with one end of an overcurrent protector, the other end of the overcurrent protector is connected with a metering device D1, and after the connection is finished, power is supplied, so that the metering device D1 performs normal metering, the voltage transformer is correct in wiring, the overcurrent protector is removed, and the output end of the voltage transformer is connected with the metering device D1, so that the device can be used; if the metering device D1 does not meter correctly after power transmission and the overcurrent protector is open, the wiring is wrong, and the wiring needs to be checked again.
The meter box has the advantages that the overcurrent protector is arranged in the meter box body, the wiring between the voltage transformer and the metering device D1 is verified through the state of the overcurrent protector, when the wiring is wrong, the overcurrent protector is broken, the voltage transformer is protected from being burnt, workers can find out the occurrence point of the wiring mistake through the communication state of the overcurrent protector, and the checking work efficiency is improved. When the wiring is correct, the overcurrent protector can be removed, the metering device D1 is put into use, the overcurrent protector does not exist, and the metering precision is higher. The overcurrent protector is arranged inside the meter box body, so that the overcurrent protector is not required to be found at present, and the wiring is more convenient.
Further, the voltage transformer includes: first winding L1, second winding L2, first connecting point P1, second connecting point P2 and third connecting point P3, first connecting point P1 with the dotted terminal electricity on first winding L1 secondary side is connected, second connecting point P2 with the non-dotted terminal on first winding L1 secondary side and the dotted terminal electricity on second winding L2 secondary side is connected, third connecting point P3 with the non-dotted terminal electricity on second winding L2 secondary side is connected, second connecting point P2 is ground connection.
More specifically, a classic application of the invention is in metering devices D1 using the voltage transformer VV wiring method. The VV wiring method is used for acquiring the voltage of a line in a mode that the coils of two voltage transformers are connected end to end in sequence.
The secondary-side dotted terminal of the first winding L1 is an a-phase, the secondary-side non-dotted terminal of the second winding L2 is a C-phase, the secondary-side non-dotted terminal of the first winding L1 and the secondary-side non-dotted terminal of the second winding L2 are electrically connected, and a connection point at which the two windings are electrically connected is a B-phase.
Since the first winding L1 and the second winding L2 are coils connected in series on one side, as known, the primary side and the secondary side transfer energy through electromagnetic induction, and the two are electromagnetically coupled and electrically insulated, and there is no electrical connection.
However, there is a risk that the secondary side and the primary side are electrically connected during operation, and in some cases, breakdown occurs between the primary side and the secondary side, resulting in a voltage on the primary side being transferred to the secondary side.
This is a dangerous source with extremely high risk, and if the staff does not discover in time that breakdown between the primary side and the secondary side, and then the electrified condition of secondary side that leads to, then can lead to the staff to electrocute.
Therefore, the non-homonymous terminal of the first winding L1 and the homonymous terminal of the second winding L2 of the voltage transformer adopting the VV wiring method are grounded, that is, the phase B is a grounding point.
Therefore, even if the primary side and the secondary side of the winding of the voltage transformer are broken down to cause the secondary side to be electrified due to some reason, the B phase is a grounding point, and therefore the risk of electric shock is not brought to workers.
For the voltage transformer adopting the VV wiring, a worker can cause the grounding of a non-grounding end by negligence, and further the coil is burnt.
One common case is that phase a or phase C is grounded, and at this time, since phase B is grounded, phase a or phase C and phase B form a short circuit loop, which causes the burning of the coil of the voltage transformer.
The meter box is used for connecting a voltage transformer and a metering device D1, and an overcurrent protector is arranged in a meter box body, and one application mode is that when the voltage transformer and the metering device D1 are connected, the overcurrent protector is firstly connected to the output end of the secondary side of the voltage transformer, and then the voltage transformer is connected to the metering device D1. Before the operation, try the power transmission earlier, when overcurrent protector does not produce the open circuit nature protection, explain not lead to the wiring mistake that the mutual-inductor burns out, just can tear overcurrent protector open this moment, with voltage transformer direct access metering device D1, put into use.
The meter box is particularly suitable for VV-wired voltage transformers, and the VV-wired voltage transformers usually have a protective grounding point for safety, and the grounding point is one of the reasons that workers are easy to operate by mistake to cause the voltage transformers to be burnt. The over-current protector for test run wiring is arranged in the meter box body of the meter box, the over-current protector is connected into the metering device D1 during wiring, and the over-current protector is removed to be put into operation formally after no problem is found in test run. The voltage transformer burnout condition caused by the error of workers is effectively avoided.
Further, the current transformer includes: third winding L3, fourth winding L4, fourth connecting point P4, fifth connecting point P5, sixth connecting point P6 and seventh connecting point P7, fourth connecting point P4 with third winding L3 homonymy end electricity is connected, fifth connecting point P5 with third winding L3 non-homonymy end electricity is connected, sixth connecting point P6 with fourth winding L4 homonymy end electricity is connected, seventh connecting point P7 with fourth winding L4 non-homonymy end electricity is connected, fifth connecting point P5 and seventh connecting point P7 ground connection.
More specifically, a common connection method of the current transformer is grounding of a non-homonymous terminal of a coil of the current transformer. The current transformer is electromagnetically coupled with a power supply line and is electrically isolated from the power supply line, but under some special conditions, the coil of the current transformer and an electric line can be broken down, so that the current transformer is electrified.
The condition is very dangerous for workers, so that one end of the current transformer is grounded, and the current transformer is mainly used for preventing personal safety and equipment safety caused by grounding.
For the case of the voltage transformer using VV wiring, the current transformer generally has two windings corresponding to the a phase and the C phase of the VV winding, respectively.
Two windings corresponding to the voltage transformer and the current transformer are connected to the metering device D1, and because the two windings of the current transformer are respectively provided with grounding points, in the installation process of workers, the situation that A phase and/or C phase of the voltage transformer is electrically connected with the non-homonymous end of the current transformer occurs even though a fault occurs, namely the first connecting point P1 and/or the third connecting point P3 are/is electrically connected with the fifth connecting point P5, or the first connecting point P1 and/or the third connecting point P3 are/is electrically connected with the seventh connecting point P7, obviously, the situation that the coil on the secondary side of the voltage transformer is short-circuited at the moment can cause the coil to be burnt.
Further, the overcurrent protector includes: the circuit breaker comprises a circuit breaker body and a fuse.
More specifically, overcurrent protector's main part is the circuit breaker body, and two kinds of possible implementation modes of the circuit breaker body are circuit breaker or fuse, and the circuit breaker more facilitates the use, with the circuit breaker closure in the time of the pilot run, come into operation promptly, if take place the misconnection, the overcurrent protection function of circuit breaker self leads to circuit breaker self disconnection, has realized the overcurrent protection function. The application of the method has the advantages that after the fault is eliminated, the method can be repeatedly used when the system is operated in a trial mode again, and the method has the defect of high cost.
The fuse is connected to a circuit before use, when misconnection occurs, the fuse is fused due to overlarge current, after the fault is eliminated, and when the fuse is tried to operate again, the fuse needs to be replaced by a new fuse.
Further, still include: the connecting piece module is fixedly arranged inside the meter box body, the voltage transformer and the current transformer are respectively connected with the metering device D1 through the connecting piece module, and the overcurrent protector is connected with the connecting piece in parallel.
Further, the tab module includes: insulating seat 1, first binding post 2, second binding post 3 and conducting strip 4, first binding post 2 and second binding post 3 is fixed the setting respectively is in the both ends of insulating seat 1, 4 both ends of conducting strip respectively with first binding post 2 and the connection can be dismantled to second binding post 3.
More specifically, the connection piece module is used for connecting the metering device D1 and the voltage transformer, and is a connection device required in normal operation.
The link module of the present invention includes: insulating seat 1, first binding post 2, second binding post 3 and conducting strip 4, a specific embodiment does, first connecting point P1 is connected with first binding post 2 electricity, second binding post 3 inserts metering device D1, before the commissioning, will overflow the protector both ends and be connected with first binding post 2 and second binding post 3 electricity respectively, realize overflowing the protector and drop into, all the other each tie points analogize in proper order, then the commissioning, after the commissioning wiring is correct, demolish and overflow the protector, connect first binding post 2 and second binding post 3 with conducting strip 4, realize conducting strip 4 and drop into, then begin the official form and move.
The connecting sheet module is in a modular design and comprises the insulating base 1, the first connecting terminal 2, the second connecting terminal 3 and the conducting sheet 4, so that the overcurrent protector and the conducting sheet 4 can be conveniently connected and removed, and the test run work is facilitated. After the trial operation is finished and the test operation is put into operation formally, the conducting plate 4 is connected, the conducting resistance of the conducting plate 4 is small, the voltage drop flowing through the connecting plate module is small enough, the influence on the metering precision is small, and the condition of the metering module is met.
Furthermore, one end of the overcurrent protector is electrically connected with the second connection point P2, and the other end of the overcurrent protector is electrically connected with the metering device D1.
Further, the overcurrent protector comprises a first overcurrent protector and a second overcurrent protector, one end of the first overcurrent protector is electrically connected with the first connection point P1, the other end of the first overcurrent protector is electrically connected with the metering device D1, one end of the second overcurrent protector is electrically connected with the third connection point P3, and the other end of the second overcurrent protector is electrically connected with the metering device D1.
More specifically, the secondary side of the voltage transformer cannot be short-circuited, and the secondary side of the current transformer cannot be open-circuited.
An optimized overcurrent protector setting mode is that the overcurrent protector is electrically connected with a second connection point P2, namely the overcurrent protector is connected with a B-phase output end in series, if an A-phase coil or a C-phase coil is overcurrent, current needs to flow through the B-phase coil, the overcurrent protector is arranged on the B-phase coil, two coils can be protected, and the number of the overcurrent protectors needed by the mode is minimum and the overcurrent protector is saved most.
The other overcurrent protector is arranged in a mode that the overcurrent protectors are respectively arranged on the phase A and the phase C, when a coil where the phase A is located is in overcurrent, the phase A overcurrent protector is in open circuit, and when a coil where the phase C is located is in overcurrent, the phase C wants to be in open circuit. Compared with the former arrangement mode of the over-current protector arranged at the B-phase output end, the arrangement mode can judge which coil is in a wiring problem from the open circuit state of the over-current protector, the fault is more conveniently checked, but the cost of paying is that an over-current protector is additionally arranged, and the wiring is more.
The invention provides two overcurrent protector setting modes of voltage transformers aiming at VV wiring, one mode is that the overcurrent protector is electrically connected with a second connecting point P2, secondary side coils of the two voltage transformers are protected by one overcurrent protector, and the overcurrent protector adopted by the mode is the least and the most economical. The other mode is that the first overcurrent protector is electrically connected with the first connection point P1, the second overcurrent protector is electrically connected with the third connection point P3, the two independent overcurrent protectors respectively protect the two secondary coils of the voltage transformer, and the mode can judge which coil is in a wiring problem from the open circuit state of the overcurrent protectors, so that faults can be more conveniently checked.
Further, the overcurrent protector further comprises: and the circuit breaking indicator lamp is used for indicating the communication state of the circuit breaking body and is connected with the circuit breaking body in parallel.
Further, the disconnection indicating lamp includes: the LED circuit breaker comprises a current-limiting resistor and an LED, wherein one end of the current-limiting resistor is electrically connected with a first end of the circuit breaker body, the other end of the current-limiting resistor is electrically connected with an anode of the LED, and a cathode of the LED is electrically connected with a second end of the circuit breaker body.
More specifically, the overcurrent protector is provided with an indicator lamp for indicating the connected state of the circuit breaker.
After the circuit is connected, if the circuit breaking body is in a connected state, the indicator lamp is in an off state.
If the circuit breaker is in a circuit breaking state, the indicator lamp is turned on to indicate that the circuit breaker is in a circuit breaking state.
One specific embodiment is that the circuit breaking indicator lamp is connected with the circuit breaking body in parallel.
The working principle is that when the breaker is in a connected state, the voltage drop generated on the breaker is very small, and the breaking indicator is in an off state because the breaking indicator is connected with the breaker in parallel.
When the circuit breaking body is in a circuit breaking state, the circuit breaking indicator lamp receives external voltage, and the voltage can light the circuit breaking indicator lamp.
A specific structure of the open circuit indicator lamp is that a current-limiting resistor is connected with a light-emitting diode in series, the indicator lamp takes the light-emitting diode as a light-emitting element, and the light-emitting diode is long and suitable for long-time use.
The overcurrent protector is provided with the circuit breaking indicator lamp, when the circuit breaking body of the overcurrent protector is broken, the circuit breaking indicator lamp is turned on to indicate the state of the circuit breaking body, and a worker can visually observe whether the voltage transformer is correctly wired or not, so that the working efficiency is higher, and the troubleshooting difficulty is lower.
The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (10)
1. An electrical energy meter box comprising: metering device, voltage transformer and current transformer respectively with the metering device electricity is connected, its characterized in that still includes: the meter box comprises a meter box body and an overcurrent protector, wherein the overcurrent protector is fixedly arranged inside the meter box body, one end of the overcurrent protector is electrically connected with the secondary side of the voltage transformer, and the other end of the overcurrent protector is electrically connected with the metering device.
2. The electrical energy meter box of claim 1, wherein the voltage transformer comprises: the transformer comprises a first winding, a second winding, a first connecting point, a second connecting point and a third connecting point, wherein the first connecting point is electrically connected with the same-name end of the secondary side of the first winding, the second connecting point is electrically connected with the non-same-name end of the secondary side of the first winding and the same-name end of the secondary side of the second winding, the third connecting point is electrically connected with the non-same-name end of the secondary side of the second winding, and the second connecting point is grounded.
3. The electrical energy meter box of claim 2, wherein the current transformer comprises: the winding structure comprises a third winding, a fourth connecting point, a fifth connecting point, a sixth connecting point and a seventh connecting point, wherein the fourth connecting point is electrically connected with the homonymous end of the third winding, the fifth connecting point is electrically connected with the non-homonymous end of the third winding, the sixth connecting point is electrically connected with the homonymous end of the fourth winding, the seventh connecting point is electrically connected with the non-homonymous end of the fourth winding, and the fifth connecting point and the seventh connecting point are grounded.
4. The electrical energy meter box of claim 3, wherein the over-current protector comprises: the circuit breaker comprises a circuit breaker body and a fuse.
5. The electrical energy meter box of claim 4, further comprising: the connecting piece module is fixedly arranged inside the meter box body, the voltage transformer and the current transformer are respectively connected with the metering device through the connecting piece module, and the overcurrent protector is connected with the connecting piece in parallel.
6. The electrical energy meter box of claim 5, wherein the tie-in module comprises: insulating seat, first binding post, second binding post and conducting strip, first binding post and second binding post is fixed the setting respectively is in the both ends of insulating seat, the conducting strip both ends respectively with first binding post and second binding post can dismantle the connection.
7. The electrical energy meter box of claim 6, wherein one end of the over-current protector is electrically connected to the second connection point and the other end of the over-current protector is electrically connected to the metering device.
8. The electric energy meter box of claim 6, wherein the over-current protector comprises a first over-current protector and a second over-current protector, wherein one end of the first over-current protector is electrically connected with the first connection point, the other end of the first over-current protector is electrically connected with the metering device, one end of the second over-current protector is electrically connected with the third connection point, and the other end of the second over-current protector is electrically connected with the metering device.
9. The electrical energy meter box of claim 7 or 8, wherein the over-current protector further comprises: and the circuit breaking indicator lamp is used for indicating the communication state of the circuit breaking body and is connected with the circuit breaking body in parallel.
10. The electrical energy meter box of claim 9, wherein the trip indicator light comprises: the LED circuit breaker comprises a current-limiting resistor and an LED, wherein one end of the current-limiting resistor is electrically connected with a first end of the circuit breaker body, the other end of the current-limiting resistor is electrically connected with an anode of the LED, and a cathode of the LED is electrically connected with a second end of the circuit breaker body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011478229.8A CN112305288A (en) | 2020-12-15 | 2020-12-15 | Electric energy meter box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011478229.8A CN112305288A (en) | 2020-12-15 | 2020-12-15 | Electric energy meter box |
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| Publication Number | Publication Date |
|---|---|
| CN112305288A true CN112305288A (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011478229.8A Pending CN112305288A (en) | 2020-12-15 | 2020-12-15 | Electric energy meter box |
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| CN (1) | CN112305288A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358905A (en) * | 2021-06-24 | 2021-09-07 | 深圳市先行电气技术有限公司 | Ammeter overload protection device |
-
2020
- 2020-12-15 CN CN202011478229.8A patent/CN112305288A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358905A (en) * | 2021-06-24 | 2021-09-07 | 深圳市先行电气技术有限公司 | Ammeter overload protection device |
| CN113358905B (en) * | 2021-06-24 | 2022-05-31 | 深圳市先行电气技术有限公司 | Ammeter overload protection device |
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