CN209929987U

CN209929987U - Power supply system for intelligently monitoring three-phase imbalance

Info

Publication number: CN209929987U
Application number: CN201920901654.XU
Authority: CN
Inventors: 田雨; 丁贵武; 欧宗现; 刘楷; 蒲小刚
Original assignee: Fujian Guangrun Energy Technology Co Ltd; Guangdong Kaineng Environmental Protection & Energy Co Ltd; Ningde Kaineng Environmental Protection Energy Co Ltd; Yangjiang Can Open Environmental Protection Energy Co Ltd; Guangdong East Can Kai Energy Co Ltd
Current assignee: Fujian Guangrun Energy Technology Co Ltd; Guangdong Kaineng Environmental Protection & Energy Co Ltd; Ningde Kaineng Environmental Protection Energy Co Ltd; Yangjiang Can Open Environmental Protection Energy Co Ltd; Guangdong East Can Kai Energy Co Ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2020-01-10
Anticipated expiration: 2029-06-14

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

Power supply system for intelligently monitoring three-phase imbalance

Technical Field

The utility model relates to a power supply technical field, concretely relates to unbalanced power supply system of intelligent monitoring three-phase.

Background

The intelligent power supply system is a power distribution system, and the intelligent power distribution system is a set of electric energy management system which is secondarily developed according to the requirements of users and following the standard specification of the power distribution system, has the characteristics of strong professional, high automation degree, easy use, high performance, high reliability and the like, and is suitable for a low-voltage power distribution system.

At present, the existing intelligent power supply system is mostly single-phase load or single-phase and three-phase load mixed use, and the load is different in size and different in power utilization time. Therefore, the unbalanced current between three phases in the power grid is objective, and the electricity utilization imbalance condition is irregular and cannot be predicted in advance. Resulting in long term imbalance of the three-phase load of the low voltage power supply system. For three-phase unbalanced current, the problems of increasing the electric energy loss of a line, increasing the electric energy loss of a distribution transformer, reducing distribution output, generating zero-sequence current by distribution transformer, influencing the safe operation of electric equipment and the like can be caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the not enough among the prior art, provide an unbalanced power supply system of intelligent monitoring three-phase, adopt this power supply system can solve the unbalanced problem of three-phase.

The purpose of the utility model is realized through the following technical scheme: the application provides a power supply system for intelligently monitoring three-phase unbalance, 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; the bus bar group is connected with a plurality of high-voltage circuit breakers and single-phase change-over switches, the incoming terminals of the high-voltage circuit breakers and the incoming terminals of the single-phase change-over switches are respectively and correspondingly electrically connected with the L1 phase, the L2 phase and the L3 phase of the bus bar group, and the high-voltage circuit breakers and the single-phase change-over switches are electrically connected with the secondary monitoring module; a second current transformer is arranged at the wire outlet end of the high-voltage circuit breaker, a third current transformer is arranged at the wire outlet end of the single-phase change-over switch, and each second current transformer and each third current transformer are in communication connection with the secondary controller; the main monitoring module is in communication connection with the secondary monitoring module; the first current transformer monitors current to generate a negative sequence signal and transmits the negative sequence signal to the main monitoring module, and the main monitoring module judges whether to transmit the negative sequence signal to the secondary monitoring module or not according to the negative sequence signal; if the negative sequence signal is transmitted to the secondary monitoring module, the secondary monitoring module controls the high-voltage circuit breaker and the single-phase change-over switch according to the negative sequence signal.

The third current transformer monitors the current of the single-phase change-over switch to generate a switching signal and transmits the switching signal to the secondary monitoring module, and the secondary monitoring module judges whether to control the single-phase change-over switch to carry out switching work according to the switching signal.

The second current transformer monitors the current of the high-voltage circuit breaker to generate a load signal and transmits the load signal to the secondary monitoring module, and the secondary monitoring module judges whether to transmit the load signal to the main monitoring module or not 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 utility model has the advantages that: 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 the module and monitor unusually, can in time adjust and feed back, rationally distribute three-phase load, can effectively avoid the potential safety hazard that unbalanced three-phase brought.

Drawings

The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.

Fig. 1 is the utility model discloses the unbalanced power supply system's of intelligent monitoring three-phase structure chart.

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

Detailed Description

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

The utility model discloses a specific implementation mode of a power supply system for intelligently monitoring three-phase imbalance, as shown in figure 1, comprising a main switch 1, a bus group, a main monitoring module 5 and a secondary monitoring module 6, wherein the main switch 1 is electrically connected with the main monitoring module 5; 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 an outlet end of the main switch 1, a first current transformer 2 is arranged at the joint of the L1 phase, the L2 phase and the L3 phase with the main switch 1, and the first current transformer 2 is in communication connection with the main monitoring module 5; the bus bar group is connected with a plurality of high-voltage circuit breakers and single-phase change-over switches, the incoming terminals of the high-voltage circuit breakers and the incoming terminals of the single-phase change-over switches are respectively and correspondingly electrically connected with the L1 phase, the L2 phase and the L3 phase of the bus bar group, and the high-voltage circuit breakers and the single-phase change-over switches are electrically connected with the secondary monitoring module 6; a second current transformer 3 is arranged at the wire outlet end of the high-voltage circuit breaker, a third current transformer 4 is arranged at the wire outlet end of the single-phase change-over switch, and each second current transformer 3 and each third current transformer 4 are in communication connection with the secondary controller; the main monitoring module 5 is in communication connection with the secondary monitoring module 6; the first current transformer 2 monitors current to generate a negative sequence signal and transmits the negative sequence signal to the main monitoring module 5, and the main monitoring module 5 judges whether to transmit the negative sequence signal to the secondary monitoring module 6 or not according to the negative sequence signal; if the negative sequence signal is transmitted to the sub-monitoring module 6, the sub-monitoring module 6 controls the high-voltage circuit breaker and the single-phase change-over 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 the switching signal to the secondary monitoring module 6, and 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 the load signal 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; if the load signal is transmitted to the main monitoring module 5, the main monitoring module 5 determines whether to turn off the main switch 1 according to the load signal.

In the power supply system for intelligently monitoring three-phase imbalance of the present embodiment, the loop monitoring of 40A and above is taken as an example for description. When the main monitoring module 5 monitors that the negative sequence voltage unbalance exceeds 1.3% and the time lasts for 1 minute. The secondary monitoring module 6 will cause the loop of the next stage to adjust or trip. If the load imbalance of the three-phase circuit is large and exceeds a specified value, 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 loop can be switched, if the load of the L1 phase is heavy and the load of the B is light, part of the load of the L1 phase can be switched to the L2 phase in a single-switch switching mode, the load balance requirement is met simultaneously, the load of the L1 phase is subtracted, the load of the L2 phase is added, the load is calculated and intelligently controlled and switched by the secondary monitoring module 6, compared with the prior art, the whole power supply system is effectively monitored by arranging the main monitoring module 5 and the secondary monitoring module 6, the balance of a three-phase system is ensured, when the monitoring module monitors the abnormity, the adjustment and the feedback can be carried out in time, the three-phase load is reasonably distributed, and the potential safety hazard caused by the unbalance of the three phases.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The utility model provides an unbalanced power supply system of intelligent monitoring three-phase which characterized in that: the system 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 bar 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 an outlet end of a main switch, a first current transformer is arranged at the joint of the L1 phase, the L2 phase and the L3 phase with the main switch, and the first current transformer is in communication connection with the main monitoring module;

the bus bar group is connected with a plurality of high-voltage circuit breakers and single-phase change-over switches, the incoming terminals of the high-voltage circuit breakers and the incoming terminals of the single-phase change-over switches are respectively and correspondingly electrically connected with the L1 phase, the L2 phase and the L3 phase of the bus bar group, and the high-voltage circuit breakers and the single-phase change-over switches are electrically connected with the secondary monitoring module;

a second current transformer is arranged at the wire outlet end of the high-voltage circuit breaker, a third current transformer is arranged at the wire outlet end of the single-phase change-over switch, and each second current transformer and each third current transformer are in communication connection with the secondary controller;

the main monitoring module is in communication connection with the secondary monitoring module;

the first current transformer monitors current to generate a negative sequence signal and transmits the negative sequence signal to the main monitoring module, and the main monitoring module judges whether to transmit the negative sequence signal to the secondary monitoring module or not according to the negative sequence signal; if the negative sequence signal is transmitted to the secondary monitoring module, the secondary monitoring module controls the high-voltage circuit breaker and the single-phase change-over switch according to the negative sequence signal.

2. The power supply system for intelligently monitoring three-phase imbalance of claim 1, wherein: the third current transformer monitors the current of the single-phase change-over switch to generate a switching signal and transmits the switching signal to the secondary monitoring module, and the secondary monitoring module judges whether to control the single-phase change-over switch to carry out switching work according to the switching signal.

3. The power supply system for intelligently monitoring three-phase imbalance of claim 1, wherein: the second current transformer monitors the current of the high-voltage circuit breaker to generate a load signal and transmits the load signal to the secondary monitoring module, and the secondary monitoring module judges whether to transmit the load signal to the main monitoring module or not 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.