CN211786032U

CN211786032U - Line monitoring device and power supply system

Info

Publication number: CN211786032U
Application number: CN202020127258.9U
Authority: CN
Inventors: 赵海龙
Original assignee: Beijing Spaceflight Changxing Technology Development Co ltd
Current assignee: Beijing Spaceflight Changxing Technology Development Co ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-10-27
Anticipated expiration: 2030-01-20

Abstract

The utility model provides a circuit monitoring devices and power supply system. The device includes: the device comprises a first current transformer, a second current transformer and a detector; the first current transformer is sleeved on the A, B, C three-phase power supply line; the second current transformer is sleeved on the N zero line; the secondary coils of the first current transformer and the second current transformer are connected in parallel, the polarities of the parallel ends of the coils are the same, and the parallel ends of the coils are connected with the detector after being connected in parallel. The utility model provides a line monitoring device and power supply system can solve the same current transformer and can not detect the unusual problem of power supply line and zero line simultaneously.

Description

Line monitoring device and power supply system

Technical Field

The utility model relates to an anticreep monitoring technology field especially relates to a circuit monitoring device and power supply system.

Background

At present, a three-phase power supply system is mostly adopted for a power supply system of commercial power. Fig. 1 shows the overall structure of a three-phase power supply system. Referring to fig. 1, the power supply lines of the three-phase power supply system include A, B, C three-phase power supply lines, and nron.

Fig. 2 shows a conventional leakage alarm device for a three-phase power supply system. The current transformer is sleeved on the A, B, C three-phase power supply line and the zero line N, and when the induction current is abnormal, the alarm device can judge and alarm the leakage condition by detecting the abnormality of the value of the induction current.

However, in an actual electrical box the ABC three-phase power supply line is usually not in the same position as the neutral line N. This makes it difficult to install the same circuit transformer on the power supply line and the zero line to monitor the abnormality of both.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a circuit monitoring device and power supply system can solve the same current transformer and can not detect the unusual problem of power supply line and zero line simultaneously.

In order to solve the technical problem, the utility model provides a circuit monitoring device, the device includes: the power supply line being monitored includes: A. b, C three-phase power supply lines, and the N neutral line; the line monitoring device includes: the device comprises a first current transformer, a second current transformer and a detector; the first current transformer is sleeved on the A, B, C three-phase power supply line; the second current transformer is sleeved on the N zero line; the secondary coils of the first current transformer and the second current transformer are connected in parallel, the polarities of the parallel ends of the coils are the same, and the parallel ends of the coils are connected with the detector after being connected in parallel.

In some embodiments, the detector is a DT-200 system detection alarm.

In some embodiments, the power supply line is from mains electricity.

In some embodiments, the power supply line is from a backup power cabinet.

In some embodiments, a backup power cabinet comprises: EPS or UPS.

In some embodiments, the A, B, C three-phase line and the nron line are connected to the load through a 4p switch.

Furthermore, the utility model also provides a power supply system, power supply system includes according to the aforesaid circuit monitoring device.

After adopting such design, the utility model discloses following advantage has at least:

the utility model discloses a current transformer is cup jointed respectively to A, B, C power supply line and N zero line to connect two current transformer's secondary coil in parallel, the polarity is unanimous, keeps the homopolar, is connecting a detector, and like this, the magnetic field offsets each other, and the electric field also offsets each other. The problem that the same current transformer is difficult to use to monitor when the power supply line and the zero line are arranged at different positions in the distribution box can be solved.

Drawings

The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.

Fig. 1 is a block diagram of a power supply system provided in the prior art;

fig. 2 is a structural diagram of an electric leakage monitoring device provided in the prior art;

fig. 3 is a structural diagram of a line monitoring device according to an embodiment of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

As shown in fig. 1, a power supply system in the related art includes: A. b, C three-phase line and N zero line, A, B, C three-phase line and N zero line are connected with load through 4p change over switch, and the load can be a plurality of. As can be seen from FIG. 1, the 4p change-over switch is respectively connected with the ABC three-phase line and the N zero line.

To above-mentioned power supply system, as shown in fig. 3, the embodiment of the utility model provides a line monitoring device, it includes: a first current transformer 101, a second current transformer 102 and a detector 200; the first current transformer 101 is sleeved on the A, B, C three-phase wire; the second current transformer 102 is sleeved on the zero line N; the secondary coils of the first current transformer 101 and the second current transformer 102 are connected in parallel, and the polarities of the parallel coil ends are the same, specifically, the positive leading-out end of the secondary coil of the first current transformer 101 is connected with the positive leading-out end of the secondary coil of the second current transformer 102, the negative leading-out end of the secondary coil of the first current transformer 101 is connected with the negative leading-out end of the secondary coil of the second current transformer 102 to form a parallel circuit, and the positive end and the negative end are connected with the detector 200 after being connected in parallel.

In the working process, because two current transformers which are connected in parallel and keep the same polarity are arranged, magnetic fields generated by the two current transformers are mutually offset, and electric fields are mutually offset. Therefore, under the condition of no electric leakage, the final detection result of the detector is not influenced.

In the above monitoring device, since the currents of the two current transformers need to be detected simultaneously, the detector is preferably a detection alarm of DT-200 series in order to ensure the accuracy of the monitoring result.

For the above power supply system, the power source may be from the mains. However, considering the cost of the double transformer, this condition is not present in many places, and therefore, the power supply system may be in another form, for example, the power supply of the power supply system comes from a backup power cabinet, and then the backup power cabinet may select an emergency power source EPS or an uninterruptible power source UPS.

The above description is only for the preferred embodiment of the present invention, and not intended to limit the present invention in any way, and those skilled in the art can make various modifications, equivalent changes and modifications using the above-described technical content, all of which fall within the scope of the present invention.

Claims

1. A line monitoring device, characterized in that, the power supply line monitored includes: A. b, C three-phase power supply lines, and the N neutral line;

the line monitoring device includes: the device comprises a first current transformer, a second current transformer and a detector; the first current transformer is sleeved on the A, B, C three-phase power supply line; the second current transformer is sleeved on the N zero line; the secondary coils of the first current transformer and the second current transformer are connected in parallel, the polarities of the parallel ends of the coils are the same, and the parallel ends of the coils are connected with the detector after being connected in parallel.

2. The line monitoring device of claim 1, wherein the detector is a DT-200 system detection alarm.

3. The line monitoring device of claim 1, wherein the power supply line is supplied from mains electricity.

4. The line monitoring device of claim 1, wherein the power supply line is powered from a back-up power cabinet.

5. The line monitoring device of claim 4, wherein the backup power cabinet comprises: EPS or UPS.

6. The line monitoring device of claim 1, wherein the A, B, C three-phase line and neutral line are connected to the load through a 4p switch.

7. A power supply system, comprising: a line monitoring device according to any one of claims 1 to 6.