CN201838975U - Overload monitoring device for distribution line - Google Patents

Abstract

The utility model relates to a power distribution line overload monitoring device, which comprises a monitoring module, an electric parameter measurement module, a switching value detection module, an alarm output module, and a PC. Module, alarm output module, PC connection. Compared with the prior art, the utility model has the advantages of multiple functions, selecting different alarm points according to different protective appliances, and the like.

Description

A distribution line overload monitoring device

technical field

The utility model relates to an overload monitoring device, in particular to an overload monitoring device for power distribution lines.

Background technique

The conventional protection used for distribution lines mainly includes miniature circuit breakers, molded case circuit breakers, and fuses to realize overload and grounding protection of distribution lines, and some important circuits, such as fire protection, medical treatment, security facilities, etc., suddenly lose power For lines with greater losses than overload, the overload protection should act on the signal rather than cut off the circuit.

Protection is required for these important distribution lines for subsequent maintenance of electrical lines. As a distribution line, the cause of overload is that the line current is too large, which leads to aging of the line, reduced insulation, and electric shock and fire accidents.

Contents of the invention

The purpose of this utility model is to provide an overload monitoring device for power distribution lines in order to overcome the above-mentioned defects in the prior art.

The purpose of this utility model can be achieved through the following technical solutions:

A distribution line overload monitoring device, characterized in that it includes a monitoring module, an electrical parameter measurement module, a switching value detection module, an alarm output module, and a PC. Module, alarm output module, PC connection.

The monitoring module is a microprocessor.

The PC is provided with a display, which displays the status information of the monitoring module in real time.

Compared with the prior art, the utility model has the following advantages:

1. The monitoring module uses Freescale's 32-bit microprocessor as the core to complete the measurement of the three-phase current, three-phase voltage and leakage current of the distribution line, and integrates the alarm function that the miniature circuit breaker and the molded case circuit breaker do not have.

2. According to the set overload current, the monitoring module realizes the two-stage alarm function, and the setting parameters have a password lock function.

3. The switching value detection function can realize the detection of the opening, closing and tripping status of the plastic case switch.

4. Programmable relay can realize remote control, linkage, local control and other functions, which is convenient and flexible.

5. RS485 communication interface, which can realize system networking. The utility model is particularly suitable for the alarm requirements of important circuits such as fire protection and security protection.

Description of drawings

Fig. 1 is the control schematic diagram of the utility model;

Fig. 2 is a structural block diagram of the utility model;

Figure 3 is a time-current graph.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, the reason for the overload of the distribution line is that the line current is too large, which leads to aging of the line, reduction of insulation, and electric shock and fire accidents. The utility model respectively proposes overload two-stage alarm protection methods after studying the protection characteristics of miniature circuit breakers, molded case circuit breakers and fuses.

As shown in Figure 2, a distribution line overload monitoring device includes a monitoring module 1, an electrical parameter measurement module 2, a switching value detection module 3, an alarm output module 4, and a PC 5, and the monitoring module 1 is connected with the The electrical parameter measurement module 2, the switching value detection module 3, the alarm output module 4, and the PC 5 are connected.

The monitoring module 1 is a microprocessor. The PC 5 is provided with a display, which displays the status information of the monitoring module in real time.

Work process of the present utility model is as follows:

1) The electrical parameter measurement module 2 collects the distribution line parameters, and the switch value detection module 3 collects the switch parameters, and transmits the distribution line parameters and the switch parameters to the monitoring module 1 in real time;

2) The monitoring module 1 judges the type of the protective device of the distribution line. If the type of the protective device is a miniature circuit breaker, perform step 3), if the type of the protective device is a molded case circuit breaker, perform step 6), if the type of the protective device is For the fuse, perform step 9);

3) The monitoring module obtains the current current value of the distribution line according to the distribution line parameters and switch parameters, and the monitoring module 1 judges whether the current current value is greater than the current value of the miniature circuit breaker alarm section 1. If yes, perform step 4) , if no, return to step 1);

4) The monitoring module 1 carries out the alarm of the first section of the miniature circuit breaker, and at the same time judges whether the current current value is greater than the current value of the second section of the miniature circuit breaker alarm, if yes, execute step 5), if not, return to step 3);

5) The monitoring module 1 judges whether the time when the current current value is greater than the current value of the second stage of the miniature circuit breaker alarm is greater than the action delay time of the second stage of the miniature circuit breaker alarm. Module 1 gives an alarm for the 1st stage of the miniature circuit breaker;

6) The monitoring module 1 obtains the current current value of the distribution line according to the parameters of the distribution line and the switch parameters, and the monitoring module judges whether the current value is greater than the current value of the molded case circuit breaker alarm section 1, if yes, go to step 7 ), if not, return to step 1);

7) The monitoring module 1 alarms the first section of the molded case circuit breaker, and at the same time judges whether the current current value is greater than the current value of the second section of the molded case circuit breaker alarm. If yes, perform step 8), if not, return to step 6);

8) The monitoring module 1 judges whether the time for the current current value to be greater than the current value of the second stage of the molded case circuit breaker alarm is greater than the action delay time of the second stage of the plastic case circuit breaker alarm. No, the monitoring module sends an alarm for the first section of the molded case circuit breaker;

9) The monitoring module 1 obtains the current current value of the distribution line according to the distribution line parameters and the switch parameters, and the monitoring module judges whether the current current value is greater than the current value of the fuse alarm section 1, if yes, execute step 10), If not, return to step 1);

10) The monitoring module 1 alarms the first section of the fuse, and simultaneously judges whether the current current value is greater than the current value of the second section of the fuse alarm, if yes, execute step 11), if not, return to step 9);

11) The monitoring module 1 judges whether the time when the current current value is greater than the current value of the second stage of the fuse alarm is greater than the action delay time of the second stage of the fuse alarm. 1 stage alarm.

The current value of the miniature circuit breaker in the step 3) is 1.13 times of the rated current.

The current value of the miniature circuit breaker in the step 4) alarming stage 2 is 1.45 times of the rated current.

The current value of the first stage of the alarm stage of the molded case circuit breaker in step 6) is 1.05 times the rated current.

The current value of the second stage of the molded case circuit breaker alarm in step 7) is 1.3 times the rated current.

The current value of the fuse alarm stage 1 in the step 9) is 1.25 times of the rated current.

The current value of the fuse alarm stage 2 in the step 10) is 1.45 times of the rated current.

As shown in Figure 3, it is a time-current graph;

code name illustrate I normal operating range II Alarm 1 section action interval III Alarm 1 stage action, alarm 2 stage non-action interval IV Alarm 2-stage action interval T1 Alarm 2-stage action delay time setting value I1 Alarm 1 stage current value I2 Alarm 2 stage current value

Claims (3)

1. A distribution line overload monitoring device, characterized in that, comprises a monitoring module, an electric parameter measurement module, a switching value detection module, an alarm output module, and a PC, and the described monitoring module is respectively connected with an electric parameter measurement module, a switch Quantity detection module, alarm output module, PC connection. 2. A distribution line overload monitoring device according to claim 1, wherein the monitoring module is a microprocessor, and the microprocessor is provided with an RS485 communication interface. 3. A distribution line overload monitoring device according to claim 1, characterized in that said PC is provided with a display.

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