CN217882859U - Three-phase load balance adjusting device - Google Patents
Three-phase load balance adjusting device Download PDFInfo
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- CN217882859U CN217882859U CN202221157976.6U CN202221157976U CN217882859U CN 217882859 U CN217882859 U CN 217882859U CN 202221157976 U CN202221157976 U CN 202221157976U CN 217882859 U CN217882859 U CN 217882859U
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Abstract
The utility model provides a three-phase load balance adjusting device, which comprises a three-phase switch, wherein the three-phase switch is constructed to respectively control the on-off of each phase of circuit according to the balance condition of three-phase load current in the circuit; and a three-phase line, each phase of the three-phase line is correspondingly connected with each switch of the three-phase switches, and the three-phase line is configured to carry out single-phase energization according to the opening and closing conditions of the three-phase switches; a detection mechanism connected to the three-phase line, the detection mechanism configured to detect a current condition in the three-phase line; the detection mechanism, the three-phase circuit and the three-phase switch are all installed at the front end of the user electric energy meter. The utility model discloses can solve the unbalanced problem of three-phase load.
Description
Technical Field
The utility model relates to a power equipment technical field, concretely relates to three-phase load balance adjusting device.
Background
In recent years, with the rapid development of industrial and commercial enterprises, the electricity consumption of China society is continuously increased, and the dependence of the masses on electricity is higher and higher. In order to meet the increasing power demand, a large amount of single-phase loads are added in a low-voltage side three-phase four-wire system of a power distribution station area in cities and rural areas. However, these loads are not distributed uniformly, and the service time period is uncertain, which brings great uncontrollable performance to the distribution area, and the situation of unbalanced three-phase load is easy to occur. When three-phase load is unbalanced, the loss of the power distribution network is increased, the electric energy utilization rate is reduced, and the power utilization safety of users and the power supply safety of a system are influenced.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiments of the present invention are directed to provide a three-phase load balance adjustment device, which can solve the problem of unbalanced three-phase load.
According to the utility model discloses an aspect, the utility model discloses an embodiment provides a three-phase load balance adjusting device, include: the three-phase switch is connected with the detection mechanism and is configured to respectively control the on-off of each phase of the line according to the balance condition of three-phase load current in the line; a three-phase line, each phase of the three-phase line being respectively connected to each of the three-phase switches, the three-phase line being configured to perform single-phase energization according to an on-off condition of the three-phase switches; and a detection mechanism connected to the three-phase line, the detection mechanism configured to detect a current condition in the three-phase line; the detection mechanism, the three-phase circuit and the three-phase switch are all installed at the front end of the user electric energy meter.
The detection mechanism is used for detecting the current condition of one electrified phase in the three-phase line, and the power supply phase and the corresponding current magnitude can be obtained through the detection of the detection mechanism. The three-phase switch is used for controlling the connection condition and the disconnection condition of the three-phase line, and the connection and the disconnection of the three-phase line can be controlled according to the balance condition of the three-phase load in the bus line, so that the load of the three-phase load can be adjusted. Only one phase switch or one phase circuit is closed at the same time, so that the short circuit condition is prevented. The three-phase load balance adjusting device is connected to the front end of the user electric energy meter in series and installed on a circuit between the secondary protection box and the user electric energy meter, the power supply can be adjusted through the three-phase load balance adjusting device and then flows into the user electric energy meter, targeted adjustment can be performed on each household, the use is more flexible, and the adjusting effect is more remarkable.
In one embodiment, the three-phase load balancing adjustment apparatus further includes: the three-phase indicator light is connected with the three-phase line in parallel and is configured to be powered on to display a single-phase line which is connected and powered in the three-phase line at present.
The three-phase indicator light is used for displaying which current phase line is in a connected state, and a user can conveniently carry out phase change operation. The on-off condition of a three-phase line in the three-phase load balance adjusting device can be quickly known through the three-phase indicator lamp, and a user is helped to quickly carry out three-phase load balance adjustment.
In one embodiment, the three-phase load balancing adjustment apparatus further includes: the protector is connected with the three-phase line in series, and is configured to break the bus line to protect the three-phase line when the current value of residual current is greater than a preset current value; wherein the residual current represents a current generated when a vector sum of currents of respective phases passing through the protector is not zero.
The protector may include a residual current operated protector, also known as a leakage protector, which is mainly used to protect against dangerous and potentially fatal electric shocks, as well as fire hazards resulting from long-lasting ground fault currents due to the inoperability of overcurrent protection devices. The installation of a residual current operated protector in a low-voltage power grid is an effective protective measure for preventing personal electric shock, electrical fire and electrical equipment damage.
In one embodiment, the three-phase load balancing adjustment apparatus further includes: three-phase buttons, each of the three-phase buttons being respectively connected to each of the three-phase switches, the three-phase buttons being configured to control the three-phase switches to be turned on or off; wherein the three-phase button is controlled by a station manager.
The three-phase button correspondingly controls the three-phase switch, the three-phase button can be controlled by a platform area manager, and the platform area manager directly controls the three-phase switch to be turned on or turned off through the three-phase button. That is to say, the three-phase load balance adjusting device is installed on the user side, when the three-phase imbalance occurs on the user side, the three-phase imbalance adjusting device can be directly processed on site, the phase with lighter load is switched to be used for power supply, and if the other phases have larger load deviation after installation, the three-phase imbalance adjusting device can be switched on site in time.
In one embodiment, the three-phase switch comprises: an AC contactor configured to be turned on or off to connect a single-phase line according to an instruction of the three-phase button.
The contact of the alternating current contactor is locked, so that only the one-phase alternating current contactor is attracted, the short circuit condition is prevented, mechanical equipment has stronger anti-interference capability and low misoperation rate relative to power electronic equipment, and reliable power supply is ensured while load adjustment is carried out.
In one embodiment, the three-phase load balancing adjustment apparatus further includes: a switching mechanism connected to each of the three phase switches, the switching mechanism configured to switch any of the three phase switches to a closed state or an open state based on a balance of three phase load currents in a bus line.
The switching mechanism can comprise a processor and a controller, wherein the processor is connected with the controller, and the processor is used for receiving the power supply phases detected by the detection mechanism and the corresponding current magnitude and judging whether the current line has a three-phase load current imbalance condition.
In one embodiment, the detection mechanism comprises: a transformer connected to the three-phase line, the transformer configured to reduce a current proportion in the three-phase line to detect a current condition in the three-phase line; an ammeter connected to the three-phase lines, respectively, the ammeter configured to detect a current condition in the three-phase lines.
The transformer may comprise a current transformer, which may be capable of converting a large current into a small current for use in a metering or protection system. In a line for supplying power and using electricity, the current difference is from several amperes to several tens of thousands of amperes, and the current in the line is relatively high and is very dangerous if measured directly. In order to facilitate the measurement of secondary instruments such as a detection mechanism and the like, the current in the line needs to be converted into more uniform current, and the transformer can play the roles of current transformation and electrical isolation, so that the safety of a power supply system is improved.
In one embodiment, the three-phase load balancing adjustment apparatus further includes: and the warning bell is connected with the detection mechanism and is configured to ring to warn when the current in the three-phase line is greater than a preset threshold value.
When the current detected in the detection mechanism is larger than a preset threshold value, the warning bell can warn to remind a transformer area manager of adjusting the heavy-load phase, the heavy-load phase is cut off, and the light-load phase is switched on. The warning bell can remind a transformer area manager that the current in the three-phase line is in a problem, so that the three-phase load can be adjusted in time, and the power utilization safety of a user and the safety of a power supply system can be guaranteed.
In one embodiment, the three-phase load balancing adjustment apparatus further includes: a housing, detection mechanism the three-phase line with the three-phase switch is all installed in the housing, the housing structure is for the protection detection mechanism the three-phase line with the three-phase switch.
The detection mechanism, the three-phase circuit and the three-phase switch are arranged in the shell, and the shell can be fixed on the wall surface. The three-phase buttons in the above embodiments may be installed on the housing, and the station manager directly adjusts disconnection and connection of one of the three phases through the three-phase buttons installed on the housing. The shell can play dustproof dampproofing effect, protects three-phase line.
In one embodiment, the three-phase load balancing adjustment apparatus further includes: a fixing mechanism mounted on the housing, the fixing mechanism configured to fix the housing on a wall surface.
The fixing mechanism can fix the three-phase load balance adjusting device on the wall surface, so that a platform area manager can observe and operate conveniently.
The embodiment of the utility model provides a three-phase load balance adjusting device is through setting up detection mechanism, three-phase switch and three-phase line to install at user's electric energy meter front end, play the effect of adjustment three-phase load. The three-phase load balance adjusting device is arranged at the front end of the user electric energy meter, and can directly adjust the three-phase load for each household. Each adjusting device can adjust and switch the electric energy meter controlled by the adjusting device between three-phase loads simply and conveniently, and the load of the phase with heavier load is switched to the phase with lighter load, so that the three-phase loads are balanced. The balance condition of three-phase load current of the electric energy meter controlled by each three-phase load balance adjusting device is observed through the detection mechanism, and when the three-phase load current is unbalanced, the on-off condition of a three-phase line is adjusted according to the actual load, so that the three-phase load is directly adjusted. The three-phase load balance adjusting device is simple in structure, flexible to use, low in cost and high in reliability, can timely process three-phase imbalance caused by unbalanced load increase, reduces the line loss rate, and effectively improves the voltage quality.
Drawings
Fig. 1 is a schematic structural diagram of a three-phase load balance adjustment apparatus according to an exemplary embodiment of the present application.
Fig. 2 is a schematic diagram illustrating a wiring principle of a three-phase load balance adjustment device according to an exemplary embodiment of the present application.
Fig. 3 is a left side view schematic diagram of a three-phase load balance adjustment device according to an exemplary embodiment of the present application.
Fig. 4 is a schematic rear view of a three-phase load balance adjustment device according to an exemplary embodiment of the present application.
Fig. 5 is a schematic bottom view of a three-phase load balance adjustment device according to an exemplary embodiment of the present disclosure.
Description of reference numerals: 1. a three-phase load balance adjustment device; 11. a three-phase switch; 12. a three-phase line; 13. a three-phase button; 14. a detection mechanism; 15. a three-phase indicator light; 16. a housing; 17. an L-shaped buckle; 18. and (6) a groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Further, in the exemplary embodiments, since the same reference numerals denote the same components having the same structure or the same steps of the same method, if an embodiment is exemplarily described, only a structure or a method different from the already described embodiment is described in other exemplary embodiments.
Throughout the specification and claims, when one element is described as being "connected" to another element, the one element may be "directly connected" to the other element or "electrically connected" to the other element through a third element. Furthermore, unless explicitly described to the contrary, the term "comprising" and its corresponding terms should only be taken as including the stated features, but should not be taken as excluding any other features.
Summary of the application
With the continuous improvement of national economy, power utilization equipment is continuously updated, the load structure of a low-voltage distribution network is changed, the requirements of people on the demand and quality of electric energy fields are increasingly improved, the quality of the electric energy quality is of great significance for the safe and stable operation of the electric equipment of the low-voltage power grid, and the quality of the electric energy quality is of great significance for guaranteeing the normal order of the living standard of people. In a low-voltage distribution network in China, the problem of three-phase imbalance exists for a long time, the problem easily causes misoperation of a protection device, influences the reliability of a power supply system, causes the reduction of the quality of electric energy, and poses great threats to the power utilization safety of users and the power supply system.
In the process of life and production power utilization, the situation that the transformer is asymmetric in operation due to three-phase imbalance can be caused, and further loss of the transformer is increased. The power loss of the distribution transformer comprises no-load loss and load loss, and zero-sequence current generated by the transformer can circulate in the wall of an oil tank of the distribution transformer under the condition of three-phase load unbalance, so that extra loss is generated due to heating, and the transformer can be burnt in severe cases.
Three-phase imbalance can also have an impact on distribution line losses. The power loss generated by the current through the conductor is proportional to the square of the line current. In a three-phase four-wire system power supply line, the power loss is as follows: p = I U 2 R U +I V 2 R V +I W 2 R W +I 0 2 R 0 Wherein, I U 、I V 、I W Indicating the current of each associated electrical line, I 0 Represents the neutral current, R U 、R V 、R W Representing the resistance value, R, of each associated electrical line 0 The neutral resistance value is shown. When three-phase loadAt equilibrium, I U ＝I V ＝I W ＝I，I 0 =0, with loss P =3I 2 And R, wherein I represents the current passing through the distribution line, and R represents the resistance value of the distribution line. At maximum unbalance, i.e. 3I for one phase, zero for the other two phases, 3I for neutral current and (3I) for power loss 2 R+(3I) 2 R 0 Therefore, under the condition of conveying the same capacity, the line loss caused by the asymmetry of the three-phase load is larger, and the economic benefit is extremely low during operation.
The three-phase imbalance can also affect a user side, and the three-phase load imbalance can cause one phase or two phases to have overlarge load, so that the line loss is increased, the electric energy quality is reduced to a certain extent, and the daily power consumption of a user is adversely affected. The burning of the transformer causes a local or overall power failure of the power supply system, and certain economic loss can also be caused. In addition, the operating temperature of the transformer is continuously increased due to the eddy current loss, and certain potential safety hazards are brought to human bodies and equipment.
Three-phase imbalance can also affect the safe operation of electrical equipment. Three-phase current value diverse when the three-phase is unbalanced to neutral line has the electric current to pass through this moment, produces impedance voltage drop, causes the drift and the three-phase unbalance of neutral point, can make the consumer electrical equipment of the higher side of voltage burn out when serious, and the consumer electrical equipment of the lower side of voltage also can not normal use, brings serious influence to electrical equipment's safe and stable operation. In addition, because the unbalanced voltage has three voltage components of positive sequence, negative sequence and zero sequence, when the unbalanced voltage is input into the 380V power supply motor, the rotating magnetic field generated by the negative sequence voltage is opposite to the rotating magnetic field generated by the positive sequence voltage, so that the braking effect is achieved, the output power of the motor is reduced, and the efficiency of the motor is reduced. Meanwhile, the temperature rise and the reactive loss of the motor are increased along with the unbalance of three-phase voltage, and the motor runs under the unbalanced condition of three phases, so that huge economic loss and potential safety hazards are brought.
The reason for the three-phase imbalance may be that a large amount of single-phase loads, asymmetric loads and nonlinear loads exist at the user side of the distribution transformer, and when the power users are numerous and distributed and the electricity consumption of the users is aperiodic, the three-phase load distribution is very easy to be unbalanced. Or when a large load of electric equipment is added in the home of an individual user, the three-phase load can be seriously deviated. Therefore, in order to solve the problem of unbalanced three phases and improve the safety of the power supply system, the three phases need to be adjusted when unbalanced, so that the unbalance degree of the three-phase load current is reduced and the power supply quality is improved.
Exemplary devices
Fig. 1 is a schematic structural diagram of a three-phase load balance adjustment device provided in an exemplary embodiment of the present application, and fig. 2 is a schematic wiring diagram of the three-phase load balance adjustment device provided in an exemplary embodiment of the present application, as shown in fig. 1 and fig. 2, an embodiment of the present invention provides a three-phase load balance adjustment device 1, including: the three-phase switch 11 is connected with the detection mechanism 14, and the three-phase switch 11 is configured to respectively control the on-off of each phase of the line according to the balance condition of three-phase load current in the line; a three-phase line 12, each phase of the three-phase line 12 being connected to each of the three-phase switches 11, respectively, the three-phase line 12 being configured to perform single-phase energization according to the opening and closing of the three-phase switches 11; and a detection mechanism 14, the detection mechanism 14 being connected to the three-phase line 12, the detection mechanism 14 being configured to detect a current condition in the three-phase line 12; wherein, detection mechanism 14, three-phase circuit 12 and three-phase switch 11 all install user's electric energy meter front end.
The detection mechanism 14 is used for detecting the current condition of one phase electrified in the three-phase line 12, and the detection of the detection mechanism 14 can obtain the power supply phase and the corresponding current magnitude. The connection and disconnection of the three-phase line 12 are controlled by the three-phase switch 11, and the connection and disconnection of the three-phase line 12 can be controlled according to the balance condition of the three-phase load detected by the front-end equipment, so that the load of the three-phase load can be adjusted. The three phases can comprise an A phase, a B phase and a C phase, for example, the A phase is heavy in load, the C phase is light in load, the load part supplied by the A phase power supply can be found, the power supply of the A phase load is disconnected, then the switch of the C phase load is closed, the C phase line is connected, and the power supply flows into the user electric energy meter from the C phase line of the three-phase load balance adjusting device 1 and then enters the home of the user for supplying power. Only one phase switch or one phase circuit is closed at the same time, so that the short circuit condition is prevented. The three-phase switches 11 are respectively connected in series with the three-phase line 12, and the three-phase line 12 is connected in parallel.
As shown in fig. 1, a distribution transformer outlet is divided into a plurality of branches, each branch includes a low-voltage side in which a, B, C, and N phases appear, wherein the three phases a, B, and C are the above three phases, a distribution transformer is installed on a 10Kv inlet line, KM denotes an ac contactor, KM1, KM2, and KM3 denote an a ac contactor, a B ac contactor, and a C ac contactor, FU denotes a fuse, FU1 and FU2 denote a first fuse and a second fuse, SA denotes a three-phase switch, SA1, SA2, and SA3 denote an a-phase switch, a B-phase switch, and a C-phase switch, CT denotes a transformer, TA denotes an ammeter, and each branch denotes a user.
The three-phase load balance adjusting device 1 is connected in series at the front end of the user electric energy meter and is installed on a circuit between the secondary protection box and the user electric energy meter, and is different from the situation that a device for adjusting three-phase load is installed at a position where a transformer appears in the prior art. The power supply can be adjusted through the three-phase load balance adjusting device 1 and then flows into the user electric energy meter, and can be adjusted in a targeted mode for each household, so that the use is more flexible, and the adjusting effect is more remarkable. For example, a building has six users, and there are six user electric energy meters in total, the three-phase load balance adjustment devices 1 are respectively installed at the front ends of the six user electric energy meters, the power flows into the user electric energy meters through the three-phase load balance adjustment devices 1, and the three-phase load is balanced and adjusted before flowing into the user electric energy meters.
The embodiment of the utility model provides a three-phase load balance adjusting device 1 is through setting up detection mechanism 14, three-phase switch 11 and three-phase line 12 to install at user's electric energy meter front end, play the effect of adjustment three-phase load. The three-phase load balance adjusting device 1 is installed at the front end of a user electric energy meter, and can directly adjust three-phase loads for each household. Each adjusting device can simply and conveniently adjust and switch the electric energy meter controlled by the adjusting device among three-phase loads, and the load of the phase with heavier load is switched to the phase with lighter load, so that the three-phase loads are balanced. The current condition of each three-phase load balance adjusting device 1 is observed through the detection mechanism 14, and when the three-phase load current has an unbalanced condition, the on-off condition of the three-phase line 12 is adjusted according to the actual load, so that the three-phase load is directly adjusted. The three-phase load balance adjusting device 1 is simple in structure, flexible to use, low in cost and high in reliability, can timely process three-phase imbalance caused by unbalanced load increase, reduces the line loss rate, and effectively improves the voltage quality.
In an embodiment, as shown in fig. 1 and fig. 2, the three-phase load balance adjustment apparatus 1 may further include: and a three-phase indicator light 15, wherein the three-phase indicator light 15 is connected with the three-phase line 12 in parallel, and the three-phase indicator light 15 is configured to be electrified and lighted so as to display the single-phase line which is connected and powered in the three-phase line 12.
The three-phase indicator light 15 is used for displaying which current phase line is in a connected state, so that a transformer area manager can conveniently change the phase. For example, when the load of the phase a is heavy and the load of the phase C is light, the switch of the phase a line can be found through the indicator light, the switch corresponding to the phase a line is disconnected, the load is powered off, the phase C switch is pressed again to connect the phase C line, the phase C line supplies power, the power supply enters the breaker through the main of the three-phase load balance adjusting device 1 by the secondary protection, then enters the phase C ac contactor and the user electric energy meter, and finally enters the home of the user to supply power. The three-phase indicator light 15 can quickly know the on-off condition of the three-phase line 12 in the three-phase load balance adjusting device 1, and helps a platform area manager to quickly adjust the three-phase load balance.
In an embodiment, the three-phase load balance adjustment apparatus may further include: the protector is connected with the three-phase circuit in series, and is constructed to break the bus circuit to protect the three-phase circuit when the current value of the residual current is greater than a preset current value; wherein the residual current represents the current generated when the vector sum of the currents of the phases passing through the protector is not zero.
The protector may include a residual current operated protector, also known as a leakage protector, which is mainly used to protect against dangerous and potentially fatal electric shock, and also to protect against fire hazards resulting from long-lasting ground fault currents due to the malfunction of overcurrent protection devices. The installation of a residual current operated protector in a low-voltage power grid is an effective protective measure for preventing personal electric shock, electric fire and damage of electrical equipment. The residual current is current with a sum of current vectors of all phases (including neutral lines) in the low-voltage distribution line being not zero. When an accident occurs at the electricity utilization side, the current flows to the ground from the charged body through a human body, so that the I phase and the I phase of the current in the inlet and outlet wires of the main circuit are unequal in magnitude, and the instantaneous vector synthesis effective value of the current is called residual current and is commonly called electric leakage. The instantaneous current of the residual current flowing through the main loop of the residual current operated protector is effective, so that the residual current changes to indicate that the ground insulation of the live conductor is damaged, and the residual current detecting link is utilized to start the protection device to trip, thereby preventing electric shock and fire caused by grounding arc.
In an embodiment, as shown in fig. 2, the three-phase load balance adjustment apparatus 1 may further include: three-phase buttons 13, each of the three-phase buttons 13 being respectively connected to each of the three-phase switches 11, the three-phase buttons 13 being configured to control the three-phase switches 11 to be turned on or off; wherein the three-phase button 13 is controlled by the station manager.
The three-phase button 13 correspondingly controls the three-phase switch 11, the three-phase button 13 can be controlled by a station area manager, and the station area manager directly controls the three-phase switch 11 to be switched on or switched off through the three-phase button 13. That is, the three-phase load balance adjustment device 1 is installed on the user side, when the three-phase imbalance occurs on the user side, the three-phase imbalance can be directly processed on the site, the phase with the lighter load is switched for power supply, and if the other phases have larger load deviation after installation, the three-phase imbalance can be timely switched on the site.
In an embodiment, the three-phase switch may include: and the alternating current contactor is configured to be switched on or switched off to connect the single-phase line according to the indication of the three-phase button.
The ac contactor is a middle control element, and has the advantages of frequent on-off of the circuit and small current control of large current. The thermal relay can also play a certain overload protection role in the load equipment in cooperation with the work. The ac contactors are KM1, KM2 and KM3 in fig. 1, respectively. Because the alternating current contactor works on and off by depending on the suction force of the electromagnetic field, compared with a manual switching-on and switching-off circuit, the alternating current contactor has higher efficiency and more flexible application, can simultaneously switch on and off a plurality of load circuits, has a self-locking function, and can enter a self-locking state to continuously work after being pulled in by a manual short circuit. Ac contactors are widely used as power breaking and control circuits.
The contact of the alternating current contactor is locked, so that only the one-phase alternating current contactor is attracted, the short circuit condition is prevented, mechanical equipment has stronger anti-interference capability and low misoperation rate relative to power electronic equipment, and reliable power supply is ensured while load adjustment is carried out.
In an embodiment, the three-phase load balance adjustment apparatus may further include: and the switching mechanism is respectively connected with each phase switch in the three-phase switches, and is configured to switch any one of the three-phase switches to a closed state or an open state according to the balance condition of the three-phase load current in the bus line.
The switching mechanism can comprise a processor and a controller, wherein the processor is connected with the controller, and the processor is used for receiving the power supply phases detected by the detection mechanism and the corresponding current magnitude, and judging whether the current line has a three-phase load current imbalance condition according to the device for detecting the three-phase load in the front. For example, when the current situation that the load of the phase A is heavy and the load of the phase C is light is detected, the phase A circuit needs to be cut off, the result of the connection of the phase C circuit is transmitted to the controller, the controller controls the opening and closing of the three-phase switch, the phase A switch is opened, the phase C switch is closed, the phase C circuit is connected, and the power supply flows into the user electric energy meter through the phase C circuit of the three-phase load balance adjusting device and then enters the home of a user to supply power.
The switching mechanism can play the role of automatic switching, and can play a certain role in adjusting the three-phase load when human intervention is not performed. The switching mechanism can also be internally provided with a communication module, the three-phase load condition of each household is transmitted to the master control platform, and the master control platform carries out remote regulation and remote control on the three-phase switch according to the three-phase load condition.
In one embodiment, the detection mechanism may include: a transformer connected to the three-phase line, the transformer configured to reduce a current proportion in the three-phase line to detect a current condition in the three-phase line; and the ammeters are respectively connected with the three-phase lines and are configured to detect the current conditions in the three-phase lines.
The transformer is the CT in fig. 1, and the transformer may include a current transformer, and the transformer may be capable of converting a large current into a small current for measuring or protecting a system. The transformer mainly functions to convert a large current into a standard small current (5A or 1A, both of which are nominal values) in proportion, so as to realize standardization and miniaturization of a detection mechanism, a protector and automatic control equipment (a switching mechanism). Meanwhile, the mutual inductor can be used for isolating a high-voltage system so as to ensure the safety of people and equipment. In the line for supplying power and using electricity, the current phase difference is from a few amperes to tens of thousands of amperes, the current ratio in the line is high, and the direct measurement is very dangerous. In order to facilitate the measurement of secondary instruments such as a detection mechanism and the like, the current in the line needs to be converted into more uniform current, and the transformer can play the roles of current transformation and electrical isolation, so that the safety of a power supply system is improved. The ammeter is TA in FIG. 1, and the ammeter comprises an A-phase ammeter, a B-phase ammeter and a C-phase ammeter, and the passing current condition of each phase is respectively detected.
In an embodiment, the three-phase load balance adjustment apparatus may further include: and the warning bell is connected with the detection mechanism and is configured to ring to warn when the current in the three-phase line is greater than a preset threshold value.
When the current detected in the detection mechanism is larger than a preset threshold value, the warning bell can warn to remind a transformer area manager of adjusting the heavy-load phase, the heavy-load phase is cut off, and the light-load phase is switched on. The warning bell can remind a transformer area manager that the current in the three-phase line is in a problem, so that the three-phase load can be adjusted in time, and the power utilization safety of a user and the safety of a power supply system can be guaranteed.
In an embodiment, the three-phase load balance adjustment apparatus further includes: the shell, detection mechanism, three-phase circuit and three-phase switch all install in the shell, and the shell is constructed as protection detection mechanism, three-phase circuit and three-phase switch.
The detection mechanism, the three-phase circuit and the three-phase switch are arranged in the shell, and the shell can be fixed on the wall surface. The three-phase buttons in the above embodiments may be installed on the housing, and the station manager directly adjusts disconnection and connection of one of the three phases through the three-phase buttons installed on the housing. The shell can play dustproof dampproofing effect, protects the three-phase line.
The currents of the three phases detected by the detection mechanism can be displayed on the housing through an ammeter, so that the current of the three phases can be directly observed by a transformer area manager.
In an embodiment, the three-phase load balance adjustment apparatus may further include: a fixing mechanism mounted on the housing, the fixing mechanism configured to fix the housing on a wall surface.
Can set up fixed establishment on the shell, fixed establishment can include the inflation screw, and the wall is nailed into to the inflation screw, fixed three-phase load balance adjusting device. Fig. 3 is a schematic left-view structural diagram of a three-phase load balance adjustment device according to an exemplary embodiment of the present disclosure, and as shown in fig. 3, the fixing mechanism may further include an L-shaped buckle 17, a hook or a cross bar is disposed on a wall surface, and the three-phase load balance adjustment device 1 is hung on the hook or the cross bar of the wall surface through the L-shaped buckle 17, so as to facilitate detachment and maintenance of the three-phase load balance adjustment device 1. Fig. 4 is a schematic rear view of a three-phase load balance adjustment device according to an exemplary embodiment of the present disclosure, fig. 5 is a schematic bottom view of the three-phase load balance adjustment device according to an exemplary embodiment of the present disclosure, as shown in fig. 4 and 5, the fixing mechanism may further include a groove 18, a clamping strip matched with the groove 18 is disposed on a wall surface, the groove 18 may slide on the clamping strip to fix and disassemble the three-phase load balance adjustment device 1, and the groove 18 is matched with the clamping strip to facilitate the disassembly and maintenance of the three-phase load balance adjustment device 1.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A three-phase load balancing adjustment apparatus, comprising:
three-phase switches configured to control the on or off of each phase line, respectively, according to a balance of three-phase load currents in the three-phase line;
a three-phase line, each phase of the three-phase line being respectively connected to each of the three-phase switches, the three-phase line being configured to perform single-phase energization according to an on-off condition of the three-phase switches; and
a detection mechanism connected to the three-phase line, the detection mechanism configured to detect a current condition in the three-phase line;
the detection mechanism, the three-phase circuit and the three-phase switch are all installed at the front end of the user electric energy meter.
2. The three-phase load balancing apparatus according to claim 1, further comprising:
the three-phase indicator light is connected with the three-phase line in parallel and is configured to be powered on to display a single-phase line which is connected and powered in the three-phase line at present.
3. The three-phase load balancing adjustment device according to claim 1, further comprising:
the protector is connected with the three-phase line in series, and is configured to break the bus line to protect the three-phase line when the current value of residual current is greater than a preset current value; wherein the residual current represents a current generated when a vector sum of currents of respective phases passing through the protector is not zero.
4. The three-phase load balancing adjustment device according to claim 1, further comprising:
three-phase buttons, each of the three-phase buttons being respectively connected to each of the three-phase switches, the three-phase buttons being configured to control the three-phase switches to be turned on or off; wherein the three-phase button is controlled by a station manager.
5. The three-phase load balancing adjustment device of claim 4, wherein the three-phase switch comprises:
an AC contactor configured to be switched on or off to connect a single-phase line according to an instruction of the three-phase button.
6. The three-phase load balancing apparatus according to claim 1, further comprising:
a switching mechanism connected to each of the three-phase switches, the switching mechanism being configured to switch any one of the three-phase switches to a closed state or an open state according to a balance of three-phase load currents in a bus line.
7. The three-phase load balancing adjustment apparatus according to claim 1, wherein the detection mechanism includes:
a transformer connected to the three-phase line, the transformer configured to reduce a current proportion in the three-phase line to detect a current condition in the three-phase line;
an ammeter connected to the three-phase lines, respectively, the ammeter configured to detect a current condition in the three-phase lines.
8. The three-phase load balancing adjustment device according to claim 1, further comprising:
and the warning bell is connected with the detection mechanism, and the warning bell is configured to ring to warn when the current in the three-phase line is greater than a preset threshold value.
9. The three-phase load balancing apparatus according to claim 1, further comprising:
a housing, detection mechanism the three-phase line with the three-phase switch is all installed in the housing, the housing structure is for the protection detection mechanism the three-phase line with the three-phase switch.
10. The three-phase load balancing adjustment device of claim 9, further comprising:
a fixing mechanism mounted on the housing, the fixing mechanism configured to fix the housing on a wall surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221157976.6U CN217882859U (en) | 2022-05-13 | 2022-05-13 | Three-phase load balance adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221157976.6U CN217882859U (en) | 2022-05-13 | 2022-05-13 | Three-phase load balance adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217882859U true CN217882859U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221157976.6U Active CN217882859U (en) | 2022-05-13 | 2022-05-13 | Three-phase load balance adjusting device |
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| Country | Link |
|---|---|
| CN (1) | CN217882859U (en) |
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2022
- 2022-05-13 CN CN202221157976.6U patent/CN217882859U/en active Active
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