CN105629125A - Transformer DC magnetic bias detecting apparatus - Google Patents

Abstract

The invention relates to power field and specifically relates to a transformer DC magnetic bias detecting apparatus. The transformer DC magnetic bias detecting apparatus is composed of five parts including a transformer neutral point Hall current sensor and vibration sensor, a real-time acquisition device, a wireless communication device, a control chamber monitoring microcomputer, and a remote state monitoring center. The transformer DC magnetic bias detecting apparatus is a full-automatic high-precision real-time monitoring apparatus, may display the DC current amplitude and polarity of the neutral point of a main transformer and a frequency-domain amplitude change of acceleration in real time, may clearly display a relation between the DC current distribution rule of the neutral point of the main transformer in a transformer station and the frequency-domain amplitudes of acceleration, determines the degree of DC magnetic bias of the transformer instantly in order to protect the transformer.

Description

A transformer DC bias detection device

technical field

The invention relates to the field of electric power, in particular to a transformer DC bias detection device.

Background technique

When the high-voltage DC device operates on a single pole ground circuit, it may have an impact on the AC device in the same area. Two substations at different DC potentials form a loop through the transmission line, and DC current will flow to the neutral point of the transformer and the transformer winding. The DC bias phenomenon will appear in the transformer, which will increase the noise and vibration of the transformer. The harm to the transformer is long-term, and there is no effective quality inspection method at present. Therefore, it is necessary to establish an effective real-time monitoring device for transformer DC bias.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a transformer DC bias detection device, the transformer DC bias detection device is composed of five parts, transformer neutral point Hall current sensor and vibration sensor, Real-time acquisition equipment, wireless communication equipment, monitoring microcomputer in the control room, and remote state monitoring center; the transformer neutral point Hall current sensor and vibration sensor, real-time acquisition equipment, wireless communication equipment, and the monitoring microcomputer in the control room are connected through wires; The monitoring microcomputer in the control room is connected with the remote monitoring center through the optical fiber network.

The real-time acquisition device uses the current acquisition card NI-9239.

The wireless communication device adopts the Mesh wireless network communication method.

The monitoring microcomputer in the control room adopts an industrial-grade 32-bit processor.

Compared with the prior art, the beneficial effect of the present invention is: the monitoring device is a complete set of automatic, high-precision, real-time monitoring device, which can display the amplitude and polarity of the DC current at the neutral point of the main transformer and the frequency of the acceleration in real time. The domain amplitude change can clearly display the distribution law of the DC current at the neutral point of the main transformer of each substation and the corresponding relationship with the frequency domain amplitude of the acceleration, and can instantly judge the degree of DC bias of the transformer and protect the transformer.

Description of drawings

Fig. 1 is a structural schematic diagram of a transformer DC bias detection device according to the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

An embodiment of a transformer DC bias detection device of the present invention: a transformer DC bias detection device, said transformer DC bias detection device consists of five parts, namely transformer neutral point Hall current sensor and vibration Sensors, real-time acquisition equipment, wireless communication equipment, monitoring computer in the control room, and remote state monitoring center; the neutral point Hall current sensor and vibration sensor of the transformer, real-time acquisition equipment, wireless communication equipment, and the monitoring computer in the control room pass through wires Connected; the monitoring computer in the control room is connected with the remote monitoring center through the optical fiber network.

The real-time acquisition device uses the current acquisition card NI-9239.

The wireless communication device adopts the Mesh wireless network communication method.

The monitoring microcomputer in the control room adopts an industrial-grade 32-bit processor.

Claims (4)

1. a transformer DC magnetic bias detecting device, it is characterized in that: described a kind of transformer DC magnetic bias detecting device is made up of five parts, transformer neutral point Hall current sensor and vibrating sensor, Real-time Collection equipment, wireless telecommunications system, the monitoring microcomputer of control room, remote condition monitoring center; Described transformer neutral point Hall current sensor and vibrating sensor, Real-time Collection equipment, wireless telecommunications system, control room monitoring microcomputer connected by electric wire; The monitoring microcomputer of described control room is connected with remote monitoring center by optical networking.

2. a kind of transformer DC magnetic bias detecting device according to claim 1, it is characterised in that: described Real-time Collection equipment uses current acquisition card NI-9239.

3. a kind of transformer DC magnetic bias detecting device according to claim 1, it is characterised in that: described wireless telecommunications system adopts Mesh wireless network Tongxu method.

4. a kind of transformer DC magnetic bias detecting device according to claim 1, it is characterised in that: the monitoring microcomputer of described control room adopts technical grade 32 bit processor.