CN210005631U

CN210005631U - Insulation online diagnosis system for air-core reactor

Info

Publication number: CN210005631U
Application number: CN201920698402.1U
Authority: CN
Inventors: 朱东柏; 陈莉娟; 李叶胜; 张恒友
Original assignee: Harbin Yibaili Technology Development Co Ltd; Harbin University of Science and Technology
Current assignee: Harbin Yibaili Technology Development Co Ltd; Harbin University of Science and Technology
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-01-31
Anticipated expiration: 2029-05-15

Abstract

The utility model provides an kinds of insulating online diagnostic system of air reactor, the diagnostic system field that belongs to air reactor the utility model provides an insulating online diagnostic system of air reactor that can the early warning, the reaction is rapid, sensitivity is high, the accuracy is high, the utility model discloses in, there are star frame axle and star frame arm on the air reactor, star frame arm is fixed at star frame epaxially, and insulating online diagnostic system includes frequency sweep power supply circuit, detection circuitry, current transformer, strapping and optic fibre, and current transformer all fixes on every star frame arm through the strapping, and frequency sweep power supply circuit and detection circuitry are connected with current transformer respectively, and detection circuitry's output and fiber connection the utility model discloses mainly used air reactor's fault diagnosis.

Description

Insulation online diagnosis system for air-core reactor

Technical Field

The utility model belongs to the diagnostic system field of air-core reactor, concretely relates to insulating online diagnostic system of air-core reactor.

Background

The reactor is an important device in a power system and plays roles of compensating stray capacitive current, limiting switching inrush current, limiting short-circuit current, filtering, blocking waves and the like, in the current power system, the application of the reactor is quite , in the type of the reactor, the use of a dry-type air reactor accounts for more than , but due to the unique structure and characteristics of the dry-type air reactor, the dry-type air reactor is easy to generate faults such as local arc discharge, insulation damage, turn-to-turn short circuit and the like, so that the stable operation of a power grid is operated, because the working environment of the dry-type air reactor is complex under normal conditions, the probability of faults is increased, in addition, because the manufacturing threshold of the reactor is lower, the quantity of manufacturers for manufacturing the reactor is larger, the used materials are greatly different, so that the quality problem of the reactor is easy to generate, the common faults of the dry-type air reactor mainly include faults such as local overheating, turn-to-turn insulation damage, magnetic leakage and the faults of surrounding metal components, grounding grid, the loss of a high-voltage cabinet internal connection terminal, heating and the like, and the like.

Therefore, there is a need for air core reactor insulation online diagnosis systems with the advantages of capability of pre-judgment, rapid response, high sensitivity and high accuracy.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to current diagnostic system can not judge in advance, the reaction is slow, sensitivity is low, the defect that the accuracy is low, kinds of air core reactor insulation on-line diagnostic system that can judge in advance, the reaction is rapid, sensitivity is high, the accuracy is high is provided.

The utility model relates to an air-core reactor insulation on-line diagnosis system's technical scheme as follows:

the utility model relates to an insulating online diagnostic system of air reactor, there are star frame axle and star frame arm on the air reactor, the star frame arm is fixed at the star frame epaxially, insulating online diagnostic system includes frequency sweep power supply circuit, detection circuitry, current transformer, strapping and optic fibre, current transformer all fixes on every star frame arm through the strapping, frequency sweep power supply circuit and detection circuitry are connected with current transformer respectively, detection circuitry's output and fiber connection.

, the sweep frequency power circuit comprises a rectification module, an inversion module, a switch and a power supply, and the current transformer is connected with the rectification module, the inversion module, the switch and the power supply in sequence.

, the detection circuit comprises a conditioning circuit, a maximum value selection circuit, an A/D converter, a CPU and a photoelectric converter, and the current transformer is connected with the conditioning circuit, the maximum value selection circuit, the A/D converter, the CPU, the photoelectric converter and the optical fiber in sequence.

the method comprises the steps of arranging a rain cover outside the insulation online diagnosis system, fixing the epoxy plate above the rain cover, fixing the insulation electronic bolt on the epoxy plate, and arranging an air gap on the current transformer.

The utility model relates to an insulating online diagnostic system of air-core reactor's beneficial effect is:

the utility model relates to an insulating online diagnostic system of air reactor, this system is according to diagnosing whether the distribution parameter of air reactor coil changes, thereby whether the reactor breaks down in advance before the trouble, it makes the user have sufficient processing time to judge in advance, thereby avoid the emergence of accident, because every distribution parameter of encapsulating is inequality, and regular difference on the frequency spectrum, therefore accessible online diagnosis location encapsulates the judgement in advance, can change through the current distribution that detects air reactor star frame arm and judge whether the insulation of air reactor changes and punctures.

Drawings

FIG. 1 is a front view of an air core reactor for on-line diagnosis;

FIG. 2 is a cross-sectional view of an on-line diagnosis of the air core reactor shown in FIG. 1;

FIG. 3 is a schematic view of a swept frequency power supply installation;

FIG. 4 is a schematic view of the installation of an optical fiber;

FIG. 5 is a circuit diagram of a swept frequency power supply circuit;

FIG. 6 is a circuit diagram of a detection circuit;

FIG. 7 is a functional block diagram of a received signal;

in the figure, 1 is a star frame shaft, 2 is a star frame arm, 3 is a sweep frequency power supply circuit, 4 is a detection circuit, 5 is a mutual inductor, 6 is a strapping tape, 7 is an optical fiber, 8 is a rain cover, 9 is an epoxy plate, 10 is an insulating electronic bolt, and 11 is an air gap.

Detailed Description

The technical solution of the present invention is described in below with reference to the embodiments, but not limited thereto, and all modifications or equivalent replacements of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the protection scope of the present invention.

Example 1

The embodiment is described with reference to fig. 1 to 7, in the embodiment, an air reactor insulation online diagnosis system according to the embodiment includes a spider shaft 1 and a spider arm 2 on the air reactor, the spider arm 2 is fixed on the spider shaft 1, the insulation online diagnosis system includes a frequency sweep power circuit 3, a detection circuit 4, a current transformer 5, a strapping tape 6 and an optical fiber 7, the current transformer 5 is fixed on each spider arm 2 through the strapping tape 6, the frequency sweep power circuit 3 and the detection circuit 4 are respectively connected with the current transformer 5, and an output end of the detection circuit 4 is connected with the optical fiber 7.

More specifically: the frequency sweeping power circuit 2 comprises a rectification module, an inversion module, a switch and a power supply, and the mutual inductance coil 5 is sequentially connected with the rectification module, the inversion module, the switch and the power supply.

More specifically: the detection circuit comprises a conditioning circuit, a maximum value selection circuit, an A/D converter, a CPU and a photoelectric converter, and the mutual induction coil 5 is sequentially connected with the conditioning circuit, the maximum value selection circuit, the A/D converter, the CPU, the photoelectric converter and the optical fiber 7.

In fig. 6, the maximum value selection circuit is a single-tube rectified current, and if only a signal with an ac signal value greater than 0 passes through a diode, that is, a positive half-axis signal of y in a coordinate axis, a capacitor functions as voltage stabilization, a current flowing through the diode charges the capacitor, a value of the capacitor is a peak value of the current signal, that is, a maximum value, a resistor functions to consume electric energy in time, and when the current flowing into the maximum value selection circuit changes, the value of the capacitor can also change in time. The photoelectric converter is used for converting an electric signal into an optical signal for transmission, is safe and efficient, and is selected from a TH-3100 module.

More specifically: the insulation online diagnosis system further comprises a rain cover 8, an epoxy plate 9 and an insulation electronic bolt 10, wherein the rain cover 8 is arranged on the outer side of the insulation online diagnosis system, the epoxy plate 9 is fixed above the rain cover 8, the insulation electronic bolt 10 is fixed on the epoxy plate 9, and an air gap 11 is formed between the mutual inductor 5 and the star frame arm 2.

In the figure 2, an epoxy plate 9 is fixed on a reactor through an insulating electronic bolt 10, a rain cover 8 is a hollow cylinder, the rain cover 8 is buckled on the epoxy plate 9, the reactor is formed by winding a coil, an equivalent circuit is formed by connecting a capacitor and a resistor in series and parallel, distribution parameters of the equivalent circuit are fixed, namely the values of the capacitor, the resistor and the inductor are , when the reactor is enveloped with water and the reactor coil deforms and is placed inside the reactor, the values of the capacitor, the resistor and the inductor change, the equivalent frequency of the system also changes, the maximum value of current also changes, the distribution parameters (namely the capacitor, the inductor and the resistance) change, namely the reactor has the reason, the upper part and the lower part of an air gap 11 are two half parts of the magnet of a wound current transformer, the coil at the lower part is a central shaft of mutual inductance, namely a supporting leg cuboid of the air core reactor is made of magnetic materials, when an alternating current flows through the upper half part of the coil, the coil on the inner part of the magnet is a central shaft of the mutual inductor, the cuboid is a central shaft of the coil, and a sweep current can flow through the star arm, and the magnetic field induction current can also flow through the star arm, and the star induction coil and the magnetic field can flow.

Determination of distribution parameters: the frequency spectrum of the distributed parameter system is measured by a frequency sweep method, the original frequency spectrum is recorded, the actually measured frequency spectrum is compared with the original frequency spectrum, and when the number and the position of extreme values are obviously changed, the coil distributed parameter can be judged to be changed. The reasons for the variation of the coil distribution parameters are: the reactor is sealed and filled with water, the reactor coil is deformed, and discharge exists in the reactor. Therefore, the measurement of the distribution parameter spectrum of the hollow reactor can diagnose the insulation condition of a certain coil.

The frequency sweep method is characterized in that the air reactor adopts a multi-branch parallel structure, fractional turns are adopted for ensuring small circulation current, and the method for realizing fractional turns is a multi-arm star frame, so that a frequency sweep signal, namely a signal f (t) -sin (k omega t), can be injected from a certain star arm of star frames²) That is, current signals of various frequencies are contained in a frequency domain, and frequency spectrums are detected from other star frames; the injection ends can be cyclically (alternately) performed on the star arms of the star frame.

Taking a certain star frame arm as an example, when K is closed, the star frame arm becomes a sweep frequency signal injection star arm, and when K is opened, the star frame arm becomes a detection star arm; when the lowest frequency is injected, the current ratios of other detection star arms when different star arms are injected are respectively recorded, and when the current ratios and the current ratios in the earlier stage are obviously changed, the fact that the reactor coil has a fault can be judged.

The value obtained on the circuit is selected through the maximum value, namely the signal of the last cycles is compared with the signal of the current cycle, the first data is abandoned, the signal of the last cycles is compared with the signal of the current cycle, and when the deviation of the signal of the current later cycle is larger than the fixed value, a fault signal is output to display for pre-judgment.

Claims

1. Insulating online diagnostic system of air reactor, air reactor is last to have star frame axle (1) and star frame arm (2), star frame arm (2) are fixed on star frame axle (1), its characterized in that, insulating online diagnostic system includes frequency sweep power supply circuit (3), detection circuitry (4), current transformer (5), strapping (6) and optic fibre (7), current transformer (5) are all fixed on every star frame arm (2) through strapping (6), frequency sweep power supply circuit (3) and detection circuitry (4) are connected with current transformer (5) respectively, the output and optic fibre (7) of detection circuitry (4) are connected.

2. The air core reactor insulation online diagnosis system according to claim 1, characterized in that the swept-frequency power supply circuit (3) comprises a rectification module, an inversion module, a switch and a power supply, and the current transformer (5) is connected with the rectification module, the inversion module, the switch and the power supply in sequence.

3. The air core reactor insulation online diagnosis system according to claim 1, characterized in that the detection circuit comprises a conditioning circuit, a maximum value selection circuit, an A/D converter, a CPU and a photoelectric converter, and the current transformer (5) is connected with the conditioning circuit, the maximum value selection circuit, the A/D converter, the CPU, the photoelectric converter and the optical fiber (7) in sequence.

4. The air core reactor insulation online diagnosis system according to claim 1, characterized by further comprising a rain cover (8), an epoxy plate (9) and an insulation electronic bolt (10), wherein the rain cover (8) is arranged outside the insulation online diagnosis system, the epoxy plate (9) is fixed above the rain cover (8), the insulation electronic bolt (10) is fixed on the epoxy plate (9), and an air gap (11) is arranged on the current transformer (5).