CN208539572U - Three-phase imbalance power distribution circuit - Google Patents

Abstract

This programme discloses a kind of three-phase imbalance power distribution circuit, including power supply and main road output par, c；Transformer unit and wire inlet unit are sequentially ingressed between main road output par, c and power supply, main road output par, c is connected with load cell, reactive compensation unit in turn and adjusts unit；Adjusting unit includes three-phase imbalance regulating device and reactor, and reactor accesses main input part, and three-phase imbalance regulating device accesses main input part by reactor；Reactive compensation unit includes capacitor, overheat protector and the first knife-like switch; first knife-like switch accesses main circuit importation; overheat protector accesses main circuit importation by the first knife-like switch, and capacitor accesses main circuit importation by overheat protector；Load unit includes load and the second knife-like switch, and the second knife-like switch accesses main circuit part, and load accesses main circuit part by the second knife-like switch.This programme solves the problems, such as voltage fluctuation zero passage in three-phase imbalance power distribution circuit.

Description

Three-phase imbalance power distribution circuit

Technical field

The utility model belongs to electron electric power technical field, in particular to a kind of three-phase imbalance power distribution circuit.

Background technique

Comprehensive distribution box is a kind of novel integrated control for integrating electric energy distribution, metering, protection, control, reactive compensation Case processed.It is widely used in substation, factory, industrial and mining enterprises, large power plant, petroleum, chemical company, large-scale steel mill, high level Build the occasions such as power center (PC), reactive compensation, metering, electric energy distribution.

Wherein, three-phase imbalance power distribution circuit is the core composition in comprehensive distribution box, to three-phase load unbalance tune During section, main voltage fluctuation and the harmonic wave etc. reduced by reactive compensation unit in circuit, so that power consumption is reduced, And electric appliance is protected.Although being more advantageous to it however, the amplitude of voltage fluctuation can be adjusted in reactive compensation unit The normal operation of electric appliance, but during voltage fluctuation is adjusted, reactive compensation unit is carrying out reactive compensation to circuit element When, long-time high current passes through, and it is various because of harm caused by high current to will cause arcing etc.；And it is existing to generate voltage fluctuation zero passage As, and the electromagnetic wave generated in zero point can impact the health of human body.

Utility model content

The utility model is intended to provide a kind of three-phase imbalance power distribution circuit, to solve prior art three-phase imbalance distribution There are voltage fluctuation zero passage in circuit, the problem of influencing human health.

Three-phase imbalance power distribution circuit in this programme, including power supply and main road output par, c；Main road output par, c and electricity Transformer unit and wire inlet unit are sequentially ingressed between source, transformer unit is close to one end of power supply；The main road output section Divide and is connected with load cell, reactive compensation unit and adjusting unit in turn；Adjust unit include three-phase imbalance regulating device and Reactor, reactor access main input part, and the three-phase imbalance regulating device accesses main input portion by reactor Point；The reactive compensation unit includes capacitor, overheat protector and the first knife-like switch, and it is defeated that the first knife-like switch accesses main circuit Enter part, the overheat protector accesses main circuit importation by the first knife-like switch, and the capacitor passes through thermal overload Protector accesses main circuit importation；The load unit includes load and the second knife-like switch, and the second knife-like switch accesses main electricity Road part, the load access main circuit part by the second knife-like switch.

The working principle and beneficial effect of this programme: electric current enters master through transformer unit, wire inlet unit from power supply Road output par, c adjusts unit and reactive compensation unit and the electric current output in main road output par, c is adjusted, flows through master The electric current of road output par, c is suitble to loaded work piece.Voltage is adjusted in capacitor in adjustment process, makes at its voltage fluctuation Three-phase imbalance regulating device is fed back in suitable section, while by result, three-phase imbalance regulating device passes through reactor Voltage fluctuation zero passage is avoided, there are voltage fluctuation zero passage, shadows to solve in three-phase imbalance power distribution circuit in the prior art The problem of ringing human health.Three-phase load unbalance self-checking device passes through real-time detection load current after opening, and analyzes Then the idle content of load current makes inverter generate the reactive compensation electric current met the requirements according to setting value, final to realize The purpose of dynamic passive compensation, optimizes power quality.And connected by reactor with three-phase load unbalance regulating device, into Higher hamonic wave in one step limiting short-circuit current and circuit avoids a little and fluctuates zero passage, so that circuit operation is more steady. And process is charged and discharged by capacitor, the charge on two-plate has cumulative process to prevent the voltage on capacitor from dashing forward The case where becoming, further avoiding voltage fluctuation zero passage generation.Overheat protector is avoided by the make and break process to circuit The case where equipment and route are damaged when electric current is excessive occurs；In conjunction with the first knife-like switch, avoids overheat protector and event occur Barrier, leads to not the case where controlling connecting and disconnecting of the circuit.This programme by adjust unit and reactive compensation unit and The setting of the second knife-like switch of load unit, so that circuit effectively increases while avoiding voltage fluctuation zero passage from happening The overall stability of circuit.

Further, the transformer unit includes transformer, and transformer uses star delta-connection.By using star connection delta Method, Eliminate highter harmonic are conducive to the normal operation of load.

Further, the wire inlet unit includes the first current transformer and third knife-like switch, and third knife-like switch passes through described Transformer connects the power supply, and first current transformer connects the transformer by third knife-like switch, and the main road is defeated Part connects the transformer by the first current transformer out.By the first current transformer, it can be achieved that current variation number According to accurate capture.

Further, access has distribution transformer monitoring terminal between the third knife-like switch and transformer.Become by distribution Depressor monitor terminal TTU can information collection and control to transformer, the operating condition of its real-time monitoring transformer, and capable of adopting The information of collection is transmitted to main website or other intelligent apparatus, data needed for providing distribution system operation control and management.

Further, between the third knife-like switch and the first current transformer, the reactor and main road output section point it Between, between first knife-like switch and overheat protector, between second knife-like switch and load be equipped with breaker.Pass through Breaker is set, the power on/off for controlling coupled equipment at any time is conducive to.

Further, described disconnected between the breaker in first knife-like switch and reactive compensation unit, in load unit The second current transformer is equipped between road device and load.By the second current transformer, can further realize to current variation The accurate capture of data.

Detailed description of the invention

Fig. 1 is the circuit diagram of the utility model three-phase imbalance power distribution circuit.

Specific embodiment

The utility model is described in further detail below by specific embodiment:

Embodiment is substantially as shown in Fig. 1: three-phase imbalance power distribution circuit, including power supply and main road output par, c；Main road Wire inlet unit and the transformer using the access of star delta-connection are sequentially ingressed between output par, c and power supply, transformer is close to electricity The one end in source；Wire inlet unit includes the first current transformer TA1 and third knife-like switch QK3 and distribution transformer monitoring terminal TTU, Distribution transformer monitoring terminal accesses power supply by transformer, and third knife-like switch accesses transformation by distribution transformer monitoring terminal Device, the first current transformer access distribution transformer monitoring terminal by third knife-like switch, and main road output par, c passes through the first electricity Current transformer connects transformer.Main road output par, c is connected with load cell, reactive compensation unit in turn and adjusts unit；It adjusts Unit includes three-phase imbalance regulating device SPC and reactor L, and reactor accesses main input part, and three-phase imbalance is adjusted Device accesses main input part by reactor；Reactive compensation unit includes that capacitor, overheat protector and the first knife are opened QK1 is closed, the first knife-like switch accesses main circuit importation, and overheat protector accesses main circuit input unit by the first knife-like switch Point, capacitor accesses main circuit importation by overheat protector；Load unit includes load and the second knife-like switch QK2, Second knife-like switch accesses main circuit part, and load accesses main circuit part by the second knife-like switch；Third knife-like switch and the first electricity Between current transformer, between reactor and main road output par, c, between the first knife-like switch and overheat protector, the second knife-like switch Circuit breaker Q F is equipped between load；Between breaker in first knife-like switch and reactive compensation unit, in load unit The second current transformer TA2 is equipped between the breaker and load.

Electric current enters main road output through transformer, distribution transformer monitoring terminal, the first current transformer from power supply Part adjusts three-phase imbalance regulating device and reactor in unit, and the capacitor and thermal overload in reactive compensation unit are protected The electric current output in main road output par, c is adjusted in shield device, and the electric current for flowing through main road output par, c is suitble to loaded work piece. Voltage is adjusted in capacitor in adjustment process, so that its voltage fluctuation is in suitable section, while result being fed back to Three-phase imbalance regulating device, three-phase imbalance regulating device avoid voltage fluctuation zero passage by reactor, to solve existing The problem of having in technology in three-phase imbalance power distribution circuit there are voltage fluctuation zero passage, influencing human health.

Above-described is only the embodiments of the present invention, and the common sense such as well known specific structure and characteristic are herein in scheme It does not describe excessively.It should be pointed out that for those skilled in the art, in the premise for not departing from the utility model structure Under, several modifications and improvements can also be made, these also should be considered as the protection scope of the utility model, these all will not influence The effect and patent practicability that the utility model is implemented.This application claims protection scope should be with the content of its claim Subject to, the records such as specific embodiment in specification can be used for explaining the content of claim.

Claims (6)

1. three-phase imbalance power distribution circuit, including load unit, power supply and main road output par, c；Main road output par, c and power supply it Between be sequentially ingressed into transformer unit and wire inlet unit, transformer unit is close to one end of power supply；It is characterized in that, the main road Output par, c is connected with load cell, reactive compensation unit in turn and adjusts unit；Adjusting unit includes that three-phase imbalance is adjusted Device and reactor, reactor access main input part, and the three-phase imbalance regulating device accesses main road by reactor Importation；The reactive compensation unit includes capacitor, overheat protector and the first knife-like switch, the first knife-like switch access master Circuit importation, the overheat protector access main circuit importation by the first knife-like switch, and the capacitor passes through Overheat protector accesses main circuit importation；The load unit includes load and the second knife-like switch, and the second knife-like switch connects Circuit part is become owner of, the load accesses main circuit part by the second knife-like switch.

2. three-phase imbalance power distribution circuit according to claim 1, it is characterised in that: the transformer unit includes transformation Device, transformer use star delta-connection.

3. three-phase imbalance power distribution circuit according to claim 2, it is characterised in that: the wire inlet unit includes the first electricity Current transformer and third knife-like switch, third knife-like switch connect the power supply, first current transformer by the transformer The transformer is connected by third knife-like switch, the main road output par, c connects the transformation by the first current transformer Device.

4. three-phase imbalance power distribution circuit according to claim 3, it is characterised in that: the third knife-like switch and transformer Between access have distribution transformer monitoring terminal.

5. three-phase imbalance power distribution circuit according to claim 4, it is characterised in that: the third knife-like switch and the first electricity Between current transformer, between the reactor and main road output par, c, between first knife-like switch and overheat protector, institute It states and is equipped with breaker between the second knife-like switch and load.

6. three-phase imbalance power distribution circuit according to claim 5, it is characterised in that: first knife-like switch and idle benefit It repays and is equipped with the second current transformer between the breaker between the breaker in unit, in load unit and load.