CN204615392U

CN204615392U - Intelligent distribution transformer

Info

Publication number: CN204615392U
Application number: CN201520344739.4U
Authority: CN
Inventors: 李绍全; 金鑫
Original assignee: QINGDAO FATE ELECTRIC APPLIANCE TECHNOLOGY Co Ltd
Current assignee: QINGDAO FEITE MEASUREMENT AND CONTROL ENERGY SAVING TECHNOLOGY Co.,Ltd.
Priority date: 2015-05-26
Filing date: 2015-05-26
Publication date: 2015-09-02
Anticipated expiration: 2025-05-26

Abstract

The utility model discloses a kind of Intelligent distribution transformer, it comprises a main transformer and a series transformer; Main transformer comprises primary coil I and the first secondary coil I, and series transformer comprises second subprime coil I, primary coil II and secondary coil II, and primary coil II is coupled with secondary coil II; Wherein: the first secondary coil I is connected secondary coil II, and secondary coil II bypass in parallel, bypass arranges bypass switch; Second subprime coil I series primary coils II, a compensation condenser of also connecting therebetween; Second subprime coil I and primary coil I are coupled as the power supply of series transformer; Second subprime coil I classification series voltage-regulating switch, in parallel between each tap changer.Can realize user side voltage automatically keeps output voltage stabilization within ± 5% in the excursion of-20%-0, power factor >=0.9.

Description

Intelligent distribution transformer

Technical field

The utility model relates to a kind of Intelligent distribution transformer being mainly used in solving end distribution user low-voltage problem.

Background technology

For long distance powedr transmission, end distribution user that radius of electricity supply is larger, low-voltage problem is very outstanding.In peak of power consumption, sometimes voltage drop reaches more than 20%, and light hours voltage is higher, adopts common electrical distribution transformer to be difficult to solve the defective problem of quality of voltage.

The generation of low-voltage problem is long mainly due to transmission line, line impedance is large.When load current is large, line drop increases, and load current hour pressure drop reduces, and causes terminal voltage fluctuation range large.Existing transformer can only accomplish qualitative transformation, cannot accomplish automatic tracking and compensating.

Utility model content

Technical problem to be solved in the utility model is: provide one to have automatic Regulation and compensate function, effectively can regulate the Intelligent distribution transformer of 10kV line end voltage.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of Intelligent distribution transformer, and it comprises a main transformer and a series transformer; Main transformer comprises primary coil I and the first secondary coil I, and series transformer comprises second subprime coil I, primary coil II and secondary coil II, and primary coil II is coupled with secondary coil II; Wherein: the first secondary coil I is connected secondary coil II, and secondary coil II bypass in parallel, bypass arranges bypass switch; Second subprime coil I series primary coils II, a compensation condenser of also connecting therebetween; Second subprime coil I and primary coil I are coupled as the power supply of series transformer; Second subprime coil I arranges classification loop, series voltage-regulating switch on classification loop, in parallel between each tap changer.

Optimize, described second subprime coil I is divided into level Four series voltage-regulating coil, and number of turn level Four series voltage-regulating coil from less to more respectively correspondence is arranged in series tap changer K1, K2, K3, K4.

Intelligent distribution transformer of the present utility model, in long distance transmission line, offsets the impact of line inductance with series capacitor.Because series capacitor and the line inductance electric current that is cascaded is identical, 90 degree, the voltage delay electric current of capacitor, the voltage leading current of inductance 90 degree, therefore capacitance voltage just just in time oppositely can cancel each other with inductive drop.When the capacitive reactance of series capacitor is equal with the induction reactance of line inductance, the voltage of line inductance is just offset completely with capacitance voltage, so the ability to transmit electricity of electrical network improves greatly, voltage stability also improves greatly.It adopts series transformer to access the mode of series capacitor, reduce line impedance and reduce voltage fluctuation, adopt autotransformer automatic Regulation to realize voltage stabilizing more further when load peak voltage drop is excessive, there is automatic Regulation and compensate function, mainly for the problem that 10kV line end voltage is low.This Intelligent distribution transformer adopts from low-pressure side series voltage-regulating transformer, simultaneously in conjunction with series-parallel comprehensive reactive power compensation technology, with the synthetical automatic control strategy of voltage first, reactive balance, realize voltage stabilizing to export, with the synthetical automatic control strategy of voltage first, reactive balance, realize voltage stabilizing and export, idle object up to standard, can realize user side voltage automatically keeps output voltage stabilization within ± 5% in the excursion of-20%-0, power factor >=0.9.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Fig. 1 is the circuit connection diagram of the utility model Intelligent distribution transformer embodiment.

Embodiment

Embodiment 1

As shown in Figure 1, the Intelligent distribution transformer of the present embodiment, it comprises a main transformer and a series transformer; Main transformer comprises primary coil I 1 and the first secondary coil I 2, and series transformer comprises second subprime coil I 5, primary coil II 4 and secondary coil II 3, and primary coil II 4 is coupled with secondary coil II 3; Wherein: the first secondary coil I 2 series connection secondary coil II 3, secondary coil II 3 bypass in parallel, bypass is arranged bypass switch 6; Second subprime coil I 5 series primary coils II 4, a compensation condenser 7 of also connecting therebetween; Second subprime coil I 5 and primary coil I 1 are coupled as the power supply of series transformer; Second subprime coil I 5 is divided into level Four loop, and number of turn level Four series voltage-regulating coil from less to more respectively correspondence is arranged in series tap changer K1, K2, K3, K4, in parallel between above-mentioned each tap changer.

The Intelligent distribution transformer of the present embodiment adopts the mode of series transformer access series capacitor 7, reduce line impedance and reduce voltage fluctuation, adopt when load peak voltage drop is excessive autotransformer automatic Regulation to realize voltage stabilizing more further, there is automatic Regulation and compensate function.Low mainly for 10kV line end voltage.

When by-pass switch 6 closes, Intelligent distribution transformer does not have voltage regulation function, can only use as common transformer, and output voltage promotes 5%, and main transformer voltage regulation coil regulates compensation condenser terminal voltage to realize imaginary power automatic compensation by electronic switch.When by-pass switch 6 is opened, voltage regulation coil changes the secondary voltage be applied on series transformer by electronic switch, thus realize on-load voltage regulation, the electric current now flowing through capacitor is directly proportional to load current for the ampere-turn equilibrium principle of series transformer, capacitor plays the effect of string benefit, can realize idle output and load is followed the tracks of naturally, the capacitance voltage simultaneously series transformer superposed also plays booster tension effect.When K1 closes, when K2, K3, K4 open, pressure regulation 6%, Intelligent distribution transformer output voltage promotes 11%; When K2 closes, when K1, K3, KD4 open, pressure regulation 12%, Intelligent distribution transformer output voltage promotes 17%.When K3 closes, when K1, K2, K4 open, pressure regulation 16%, Intelligent distribution transformer output voltage promotes 23%, and when K4 closes, when K1, K2, K3 open, pressure regulation 24%, Intelligent distribution transformer output voltage promotes 29%.

Claims

1. an Intelligent distribution transformer, is characterized in that: it comprises a main transformer and a series transformer; Main transformer comprises primary coil I and the first secondary coil I, and series transformer comprises second subprime coil I, primary coil II and secondary coil II, and primary coil II is coupled with secondary coil II; Wherein: the first secondary coil I is connected secondary coil II, and secondary coil II bypass in parallel, bypass arranges bypass switch; Second subprime coil I series primary coils II, a compensation condenser of also connecting therebetween; Second subprime coil I and primary coil I are coupled as the power supply of series transformer; Second subprime coil I arranges classification loop, series voltage-regulating switch on classification loop, in parallel between each tap changer.

2. Intelligent distribution transformer according to claim 1, is characterized in that: described second subprime coil I is divided into level Four series voltage-regulating coil, and number of turn level Four series voltage-regulating coil from less to more respectively correspondence is arranged in series tap changer K1, K2, K3, K4.