CN204515063U - Leakage monitoring device - Google Patents

Abstract

The utility model relates to a device capable of detecting leakage signals in time, in particular to a leakage monitoring device, comprising: a main control module, a leakage detection module, a simulated leakage module, an alarm module, a display module and a power supply module, the main control module They are respectively connected with the leakage detection module, the analog leakage module, the alarm module and the display module, and the power supply module supplies power for the whole device; the utility model is applicable to the electric power department.

Description

Leakage monitoring device

technical field

The utility model relates to a device capable of detecting leakage signals in time, in particular to a leakage monitoring device.

Background technique

At present, various protection devices for low-voltage distribution transformers (referred to as transformers) include various high-voltage circuit breakers, lightning arresters, etc. Such protection measures, but due to the variety of transformer capacity levels and complex lines, it is difficult to be foolproof with various protection measures, especially the leakage fault of the transformer, which may occur in any part, and the general leakage protection is in the main circuit. Moreover, whether the leakage protection circuit itself is effective or not can not be monitored in real time, which leads to the failure of timely detection of transformer leakage faults. Due to the aging of the power grid, changes in the production environment, and grounding points in the power grid, short circuits to ground will occur, cables and motors will be damaged. Leakage accidents often occur in windings. After leakage accidents, it will not only lead to personal electric shock accidents, but also cause single-phase grounding, which will develop into phase-to-phase short circuit, and then cause electrical fire accidents, which will bring many adverse effects to normal production and life.

Contents of the invention

The utility model overcomes the deficiencies in the prior art, and the technical problem to be solved is to provide a device capable of detecting leakage information at all times.

The utility model is realized by adopting the following technical solutions:

A leakage monitoring device, comprising: a main control module, a leakage detection module, a simulated leakage module, an alarm module, a display module and a power supply module, and the main control module is respectively connected to the leakage detection module, the simulated leakage module, the alarm module and the display module , the power module supplies power to the entire device;

The circuit structure of the leakage detection module is as follows: the current transformer T1 and the current transformer T2 are respectively connected in series on the phase line and the neutral line of the power supply line, and the primary side of the transformer T3 is wound with two groups of identical coils, and the current The signal output ends of the transformer T1 and the current transformer T2 are respectively connected to the primary side coil of the transformer T3;

The anode of the output terminal of the secondary side of the transformer T3 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to one end of the capacitor C1 in parallel, and the cathode of the diode D2 is connected to the positive input of the comparator IC1, and the transformer T3 The negative pole of the secondary side output terminal of the secondary side is connected in parallel with the other end of the capacitor C1, the positive pole of the diode D2 and one end of the resistor R1, and then grounded, and the other end of the resistor R1 is connected in parallel with one end of the resistor R2, and then connected with the negative input end of the comparator IC1 , the output end of the comparator IC1 is connected in parallel with the other end of the resistor R2 and then connected with one end of the resistor R3;

The other end of the resistor R3 is connected to the positive input terminal of the comparator IC2, the negative input terminal of the comparator IC2 is connected to one end of the resistor R4 in parallel and then connected to one end of the resistor R5, and the other end of the resistor R4 is connected to +5V The power supply is connected, the other end of the resistor R5 is grounded, the output end of the comparator IC2 is connected to the anode of the diode D3 after the resistor R6 is connected in series, and the cathode of the diode D3 is the signal output end a1 of the leakage detection module.

There are multiple leakage detection modules, which can detect leakage information of multiple branches at the same time. The current transformer T1 and current transformer T2 are identical, and they are symmetrically placed on the phase line and the neutral line respectively. When there is no leakage in the line , The secondary side of the transformer T3 does not generate an induced potential. When there is leakage in the line, the secondary side of the transformer T3 generates an induced potential, which is amplified by the comparator and then outputs a leakage signal.

The leakage monitoring device also includes a temperature detection module 7 , and the temperature detection module 7 is connected to the above-mentioned main control module 1 .

Compared with the prior art, the utility model has the beneficial effects that: the utility model collects the leakage situation of each equipment through the leakage collection module, and sends the leakage situation to the main control module, and the alarm and display connected by the main control module The module sends out leakage alarm and display, can measure the leakage situation on site, is convenient to use, can detect the leakage information of multiple branches at the same time, and the detection is accurate, and is also equipped with an analog leakage module, which can test whether the leakage detection circuit is effective; the structure of the whole device Simple and easy to use.

Description of drawings

Fig. 1 is a schematic diagram of the circuit structure of the utility model.

Fig. 2 is a circuit diagram of the leakage detection module in the utility model.

In the figure: 1-main control module, 2-leakage detection module, 3-analog leakage module, 4-alarm module, 5-display module, 6-power supply module, 7-temperature detection module.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

A leakage monitoring device, as shown in Figure 1, comprises: a main control module 1, a leakage detection module 2, an analog leakage module 3, an alarm module 4, a display module 5, a power supply module 6 and a temperature detection module 7, the main control The module 1 is respectively connected with the leakage detection module 2, the analog leakage module 3, the alarm module 4, the display module 5 and the temperature detection module 7, and the power supply module 6 supplies power for the whole device.

As shown in Figure 2, the circuit structure of the leakage detection module 2 is: the current transformer T1 and the current transformer T2 are respectively connected in series on the phase line and the neutral line of the power supply line, and the primary side of the transformer T3 is wound with two groups For the same coils, the signal output ends of the current transformer T1 and the current transformer T2 are respectively connected to the primary side coil of the transformer T3, and the turns ratio of the primary side and the secondary side of the transformer T3 is 1:5.

The anode of the output terminal of the secondary side of the transformer T3 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to one end of the capacitor C1 in parallel, and the cathode of the diode D2 is connected to the positive input of the comparator IC1, and the transformer T3 The negative pole of the secondary side output terminal of the secondary side is connected in parallel with the other end of the capacitor C1, the positive pole of the diode D2 and one end of the resistor R1, and then grounded, and the other end of the resistor R1 is connected in parallel with one end of the resistor R2, and then connected with the negative input end of the comparator IC1 , the output end of the comparator IC1 is connected in parallel with the other end of the resistor R2 and then connected with one end of the resistor R3.

The other end of the resistor R3 is connected to the positive input terminal of the comparator IC2, the negative input terminal of the comparator IC2 is connected to one end of the resistor R4 in parallel and then connected to one end of the resistor R5, and the other end of the resistor R4 is connected to +5V Connected to the power supply, the other end of the resistor R5 is grounded, the output end of the comparator IC2 is connected to the anode of the diode D3 after the resistor R6 is connected in series, and the cathode of the diode D3 is the signal output end a1 of the leakage detection module 2 .

There are multiple leakage detection modules 2, which can detect leakage information of multiple branches at the same time. The current transformer T1 and the current transformer T2 are identical, and they are symmetrically placed on the phase line and the neutral line respectively, and the lines have no leakage , the secondary side of the transformer T3 does not generate an induced potential, and when there is leakage in the line, the secondary side of the transformer T3 generates an induced potential, which is amplified by the comparator and then outputs a leakage signal.

The utility model collects the leakage situation of each equipment through the leakage collection module, and sends the leakage situation to the main control module, and the alarm and display module connected to the main control module sends a leakage alarm and display, and can measure the leakage situation on site, which is convenient It can detect the leakage information of multiple branches at the same time, and the detection is accurate, and it is also equipped with an analog leakage module, which can test whether the leakage detection circuit is effective; the whole device has a simple structure and is easy to use.

The above embodiments of the utility model have been described in detail in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiments. Make various changes below.

Claims (3)

1. A leakage monitoring device, characterized in that it includes a main control module (1), a leakage detection module (2), an analog leakage module (3), an alarm module (4), a display module (5) and a power supply module (6 ), the main control module (1) is respectively connected with the leakage detection module (2), the analog leakage module (3), the alarm module (4) and the display module (5), and the power supply module (6) supplies power for the whole device ; The circuit structure of the leakage detection module (2) is as follows: the current transformer T1 and the current transformer T2 are respectively connected in series to the phase line and the neutral line of the power supply line, and the primary side of the transformer T3 is wound with two sets of identical coils, The signal output terminals of the current transformer T1 and the current transformer T2 are respectively connected to the primary side coil of the transformer T3; The anode of the output terminal of the secondary side of the transformer T3 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to one end of the capacitor C1 in parallel, and the cathode of the diode D2 is connected to the positive input of the comparator IC1, and the transformer T3 The negative pole of the secondary side output terminal of the secondary side is connected in parallel with the other end of the capacitor C1, the positive pole of the diode D2 and one end of the resistor R1, and then grounded, and the other end of the resistor R1 is connected in parallel with one end of the resistor R2, and then connected with the negative input end of the comparator IC1 , the output end of the comparator IC1 is connected in parallel with the other end of the resistor R2 and then connected with one end of the resistor R3; The other end of the resistor R3 is connected to the positive input terminal of the comparator IC2, the negative input terminal of the comparator IC2 is connected to one end of the resistor R4 in parallel and then connected to one end of the resistor R5, and the other end of the resistor R4 is connected to +5V The power supply is connected, the other end of the resistor R5 is grounded, the output end of the comparator IC2 is connected to the anode of the diode D3 after the resistor R6 is connected in series, and the cathode of the diode D3 is the signal output end a1 of the leakage detection module (2). 2. The leakage monitoring device according to claim 1, characterized in that there are multiple leakage detection modules (2). 3. A leakage monitoring device according to claim 1 or 2, characterized in that: the leakage monitoring device also includes a temperature detection module (7), the temperature detection module (7) and the above-mentioned main control module ( 1) connected.