CN209929987U - An intelligent monitoring three-phase unbalanced power supply system - Google Patents

Abstract

The utility model relates to the technical field of power supply, in particular to a power supply system for intelligently monitoring three-phase imbalance, which comprises a main switch, a bus group, a main monitoring module and a secondary monitoring module, wherein the main switch is electrically connected with the main monitoring module; the bus group comprises an L1 phase, an L2 phase, an L3 phase, an N phase and a PE phase which are arranged side by side, the L1 phase, the L2 phase and the L3 phase are electrically connected with a wire outlet end of the main switch, and first current transformers are arranged at the joints of the L1 phase, the L2 phase, the L3 phase and the main switch and are in communication connection with the main monitoring module; compared with the prior art, through setting up main monitoring module and inferior monitoring module, monitor whole power supply system effectively, guarantee three-phase system's balance, monitor when the monitoring module and monitor unusually, can in time adjust and feed back, rationally carry out intelligent dynamic distribution to three-phase load, effectively avoid little electric wire netting unbalanced three phase, solved the potential safety hazard problem that unbalanced three phase brought from the source.

Description

An intelligent monitoring three-phase unbalanced power supply system

technical field

The utility model relates to the technical field of power supply, in particular to a power supply system for intelligently monitoring three-phase unbalance.

Background technique

The intelligent power supply system is also the power distribution system. The intelligent power distribution system is a set of secondary development according to the needs of users and following the standard specifications of the power distribution system. It has strong professionalism, high degree of automation, easy to use, high performance and high reliability. It is a power management system suitable for low-voltage power distribution systems with features such as

At present, because the existing intelligent power supply system is mostly single-phase load or mixed use of single-phase and three-phase load, and the load size and electricity consumption time are different. Therefore, the unbalanced current between the three phases in the power grid exists objectively, and the unbalanced state of electricity consumption is irregular and cannot be predicted in advance. It leads to the long-term unbalance of the three-phase load of the low-voltage power supply system. For three-phase unbalanced current, it will increase the power loss of the line, increase the power loss of the distribution transformer, reduce the output of the distribution transformer, generate zero-sequence current from the distribution transformer, and affect the safe operation of the electrical equipment.

Utility model content

The purpose of the utility model is to provide a power supply system for intelligently monitoring three-phase unbalance in view of the deficiencies in the prior art, and the use of the power supply system can solve the problem of three-phase unbalance.

The purpose of the utility model is achieved through the following technical solutions: the application provides a power supply system for intelligently monitoring three-phase unbalance, including a main switch, a bus group, a main monitoring module and a secondary monitoring module, and the main switch is electrically connected with the main monitoring module; The busbar group includes L1 phase, L2 phase, L3 phase, N phase and PE phase arranged side by side. The L1 phase, L2 phase and L3 phase are electrically connected with the outlet terminal of the main switch. A first current transformer is arranged at the connection, and the first current transformer is connected to the main monitoring module in communication; a plurality of high-voltage circuit breakers and single-phase changeover switches are connected to the busbar group, and the incoming terminal of the high-voltage circuit breaker and the single-phase changeover switch are connected The incoming terminals of the high-voltage circuit breakers are respectively electrically connected with the L1 phase, L2 phase and L3 phase of the bus group, and a plurality of high-voltage circuit breakers and single-phase switching switches are electrically connected with the secondary monitoring module; Current transformer, the outlet end of the single-phase switch is provided with a third current transformer, each of the second current transformer and the third current transformer is connected to the secondary controller in communication; the main monitoring module and the secondary monitoring module are connected in communication; A current transformer monitors the current to generate a negative sequence signal and transmit it to the main monitoring module. The main monitoring module judges whether to transmit the negative sequence signal to the secondary monitoring module according to the negative sequence signal; if the negative sequence signal is transmitted to the secondary monitoring module, the secondary monitoring The module controls the high-voltage circuit breaker and the single-phase switch according to the negative sequence signal.

The third current transformer monitors the current of the single-phase switch to generate a switching signal and sends it to the secondary monitoring module, and the secondary monitoring module judges whether to control the single-phase switch to perform switching according to the switching signal.

Among them, the second current transformer monitors the current of the high-voltage circuit breaker to generate a load signal and transmit it to the secondary monitoring module, and the secondary monitoring module judges whether to transmit the load signal to the main monitoring module according to the load signal; if the load signal is transmitted to the main monitoring module. , the main monitoring module judges whether to disconnect the main switch according to the load signal.

The beneficial effects of the utility model: compared with the prior art, by setting the main monitoring module and the secondary monitoring module, the entire power supply system can be effectively monitored to ensure the balance of the three-phase system. Adjust and feedback, and distribute the three-phase load reasonably, which can effectively avoid the safety hazard caused by the three-phase unbalance.

Description of drawings

The present invention will be further described by using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, under the premise of no creative work, the following drawings can also be used to obtain Additional drawings.

FIG. 1 is a structural diagram of the power supply system for intelligently monitoring three-phase unbalance of the present invention.

Description of drawings: main switch 1 , first current transformer 2 , second current transformer 3 , third current transformer 4 , main monitoring module 5 , detection module 6 .

Detailed ways

The present invention will be further described with reference to the following examples.

A specific embodiment of a power supply system for intelligently monitoring three-phase unbalance of the present invention, as shown in FIG. 1, includes a main switch 1, a bus group, a main monitoring module 5 and a secondary monitoring module 6. The main switch 1 and the main switch The monitoring module 5 is electrically connected; the bus bar group includes L1 phase, L2 phase, L3 phase, N phase and PE phase arranged side by side, L1 phase, L2 phase and L3 phase are electrically connected with the outlet end of the main switch 1, L1 phase, L2 phase The connection between the L3 phase and the main switch 1 is provided with a first current transformer 2, and the first current transformer 2 is communicated with the main monitoring module 5; The incoming terminal of the circuit breaker and the incoming terminal of the single-phase switch are respectively corresponding to the L1 phase, L2 phase and L3 phase of the bus group. Connection; the outlet end of the high-voltage circuit breaker is provided with a second current transformer 3, the outlet end of the single-phase switch is provided with a third current transformer 4, and each second current transformer 3 and third current transformer 4 are connected with the secondary current transformer 4. The controller is connected in communication; the main monitoring module 5 and the secondary monitoring module 6 are in communication connection; the first current transformer 2 monitors the current to generate a negative sequence signal and transmits it to the main monitoring module 5, and the main monitoring module 5 judges whether to transmit the signal according to the negative sequence signal. The negative sequence signal is sent to the secondary monitoring module 6; if the negative sequence signal is transmitted to the secondary monitoring module 6, the secondary monitoring module 6 controls the high-voltage circuit breaker and the single-phase switch according to the negative sequence signal.

In this embodiment, the third current transformer 4 monitors the current of the single-phase switch to generate a switching signal and transmits it to the secondary monitoring module 6. The secondary monitoring module 6 determines whether to control the single-phase switch to perform switching according to the switching signal.

In this embodiment, the second current transformer 3 monitors the current of the high-voltage circuit breaker to generate a load signal and transmits it to the secondary monitoring module 6, and the secondary monitoring module 6 determines whether to transmit the load signal to the main monitoring module 5 according to the load signal; The load signal is transmitted to the main monitoring module 5, and the main monitoring module 5 judges whether to disconnect the main switch 1 according to the load signal.

A power supply system for intelligently monitoring three-phase unbalance in this embodiment is described by taking the monitoring of circuits of 40A and above as an example. When the main monitoring module 5 detects that the negative sequence voltage unbalance exceeds 1.3% and the time lasts for 1 minute. Then the secondary monitoring module 6 will make the loop of the next stage to be adjusted or tripped. If the load imbalance of the three-phase circuit is large and exceeds the specified value, then the load is faulty, and the main switch 1 can be tripped. When the main monitoring module 5 monitors that the unbalance of the load exceeds the standard, the single-phase circuit can be switched. If the L1 phase load is heavy and the B load is light, then part of the L1 phase load can be switched to the L2 phase by switching the single switch switch. To meet the requirements of load balance, how much load is subtracted from L1 and how much load is added by L2 are calculated and intelligently controlled by the secondary monitoring module 6. Compared with the prior art, by setting the primary monitoring module 5 and the secondary monitoring module 6, effectively Monitor the entire power supply system to ensure the balance of the three-phase system. When the monitoring module detects an abnormality, it can adjust and feedback in time, and distribute the three-phase load reasonably, which can effectively avoid the potential safety hazards caused by three-phase unbalance.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Persons should understand that the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims (3)

1. a power supply system for intelligent monitoring of three-phase unbalance, characterized in that: comprising a main switch, a bus group, a main monitoring module and a secondary monitoring module, the main switch is electrically connected with the main monitoring module; The busbar group includes L1 phase, L2 phase, L3 phase, N phase and PE phase arranged side by side, the L1 phase, L2 phase and L3 phase are electrically connected with the outlet end of the main switch, the L1 phase, L2 phase, A first current transformer is arranged at the connection between the L3 phase and the main switch, and the first current transformer is connected in communication with the main monitoring module; A plurality of high-voltage circuit breakers and single-phase changeover switches are connected to the busbar group, and the incoming terminal of the high-voltage circuit breaker and the incoming line terminal of the single-phase changeover switch are respectively corresponding to the L1 phase, L2 phase and L3 phase of the busbar group. connection, a plurality of high-voltage circuit breakers and single-phase transfer switches are electrically connected to the secondary monitoring module; The outlet end of the high-voltage circuit breaker is provided with a second current transformer, and the outlet end of the single-phase switch is provided with a third current transformer, and each of the second current transformers and the third current transformers are connected in communication with the secondary controller; The primary monitoring module and the secondary monitoring module are connected in communication; The first current transformer monitors the current to generate a negative sequence signal and transmit it to the main monitoring module, and the main monitoring module judges whether to transmit the negative sequence signal to the secondary monitoring module according to the negative sequence signal; if the negative sequence signal is transmitted to the secondary monitoring module, the secondary monitoring module The monitoring module controls the high-voltage circuit breaker and the single-phase switch according to the negative sequence signal. 2. The power supply system for intelligently monitoring three-phase unbalance according to claim 1, wherein the third current transformer monitors the current of the single-phase switch to generate a switching signal and transmits it to the secondary monitoring module, and the secondary monitoring module according to the current The switching signal judges whether to control the single-phase switching switch to perform switching work. 3. The power supply system for intelligently monitoring three-phase unbalance according to claim 1, wherein the second current transformer monitors the current of the high-voltage circuit breaker to generate a load signal and transmits it to the secondary monitoring module, and the secondary monitoring module according to the load The signal judges whether to transmit the load signal to the main monitoring module; if the load signal is transmitted to the main monitoring module, the main monitoring module judges whether to disconnect the main switch according to the load signal.

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