CN212084356U

CN212084356U - TT power supply system residual current resistance-capacitance separation type electric fire monitoring detector

Info

Publication number: CN212084356U
Application number: CN202020451311.0U
Authority: CN
Inventors: 黄照东; 谭宇宁; 张金成; 叶小雪; 陈寿文; 赵剑秋
Original assignee: Guangzhou Tianfu Rencai Photoelectric Technology Co ltd
Current assignee: Guangzhou Tianfu Rencai Photoelectric Technology Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-12-04
Anticipated expiration: 2030-03-31

Abstract

The utility model discloses a TT power supply system residual current resistance-capacitance disconnect-type electric fire control detector, include: the voltage sampling module is electrically connected with the MCU processor through a first input interface, and the residual current sampling module is electrically connected with the MCU processor through a second input interface; the reference current sampling module is electrically connected with the MCU processor through a third input interface; the utility model provides a TT power supply system residual current resistance-capacitance disconnect-type electric fire control detector with resistive current separation technique accurate separation out the resistive component leakage current that represents insulating properties from the residual current, the capacitive component leakage current that filtering circuit and equipment arouse.

Description

TT power supply system residual current resistance-capacitance separation type electric fire monitoring detector

Technical Field

The utility model relates to a fire control technical field, more specifically the utility model relates to a TT power supply system residual current resistance-capacitance disconnect-type electric fire control detector that says so.

Background

At present, the real-time online monitoring of the insulation resistance to ground of the three-phase TT power supply system is an important means for the safe operation of a power grid.

However, the current detected by the residual current type electrical fire monitoring detector at home and abroad is the combined current in a loop, capacitive and resistive residual currents cannot be distinguished, the real harmfulness on the circuit is the resistive part, the resistive residual current is an important factor for generating electric leakage and heating to form fire, and the actual situation is that the circuit often contains very large capacitive residual current, so that false alarm or abnormal use is easily generated in the detection process, effective and real data cannot be accurately provided, the reliability of an electrical fire monitoring system is seriously influenced, and much trouble and unnecessary maintenance work is added for operation and maintenance.

Therefore, it is an urgent problem to be solved by those skilled in the art to provide a fire detector capable of separating capacitive and resistive residual currents detected in a circuit.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a TT power supply system residual current resistance-capacitance disconnect-type electric fire control detector with hindering nature current separation technique from the residual current accurate isolation represent insulating properties's resistive component leakage current, capacitive component leakage current that filtering circuit and equipment arouse.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a TT power supply system residual current resistance-capacitance disconnect-type electric fire monitors detector includes:

an MCU processor;

the voltage sampling module is electrically connected with the MCU processor through a first input interface;

the residual current sampling module is electrically connected with the MCU processor through a second input interface;

and the reference current sampling module is electrically connected with the MCU processor through a third input interface.

Preferably, the method further comprises the following steps: the voltage sampling module, the residual current sampling module and the reference current sampling module are also connected with an operational amplification module.

Preferably, the method further comprises the following steps: and the data processing module is electrically connected with the MCU processor through a second output interface.

Preferably, the method further comprises the following steps: and the data display module is electrically connected with the MCU processor through a first output interface.

Preferably, the method further comprises the following steps: and the input end of the analog-to-digital conversion module is electrically connected with the operational amplification module, and the output end of the analog-to-digital conversion module is electrically connected with the MCU processor.

Preferably, the interface module is an RS485 interface.

According to the above technical scheme, compare with prior art, the utility model discloses a TT power supply system residual current resistance-capacitance disconnect-type electric fire control detector is provided, with the accurate resistive component leakage current who stands for insulating properties of separating out in the residual current of resistive current separation technique, capacitive component leakage current that filtering circuit and equipment arouse.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural view provided by the present invention;

fig. 2 is a schematic circuit diagram of an MCU processor circuit according to an embodiment of the present invention;

in fig. 1-2:

the device comprises a 1-MCU processor, a 2-voltage sampling module, a 3-residual current sampling module, a 4-reference current sampling module, a 5-data display module, a 6-interface module, a 7-operational amplification module, an 8-data processing module and a 9-analog-to-digital conversion module.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model discloses TT power supply system residual current resistance-capacitance disconnect-type electric fire control detector, include:

an MCU processor 1;

the voltage sampling module 2 is electrically connected with the MCU processor 1 through a first input interface;

the residual current sampling module 3 is electrically connected with the MCU processor 1 through a second input interface;

and the reference current sampling module 4 is electrically connected with the MCU processor 1 through a third input interface.

In a specific embodiment, the method further comprises the following steps: the voltage sampling module 2, the residual current sampling module 3 and the reference current sampling module 4 are also connected with an operational amplification module 7.

Specifically, the core processing circuit of the MCU processor may be as shown in fig. 2, and includes a single chip microcomputer U4, and a plurality of resistors and capacitors, where pin 19 of the single chip microcomputer U4 is connected to one end of a capacitor C9 and a capacitor C10, pin 20 and pin 21 are connected to the other ends of the capacitor C9 and the capacitor C10, and two ends of the capacitor C9 and the capacitor C10 are sequentially connected;

pins

6, 11, 27, 50, 75 and 100 are connected to one ends of the

capacitors

13, 14, 15, 16, 17, 18 and 19,

pins

10, 26, 49, 74 and 99 are connected to the other ends of the

capacitors

13, 14, 15, 16, 17, 18 and 19, and the two ends of the

capacitors

13, 14, 15, 16, 17, 18 and 19 are connected in sequence; one end of the capacitor 21 is connected with the pin 48, one end of the capacitor 22 is connected with the other end of the capacitor 21, and the other end of the capacitor 22 is connected with the pin 73; the pin 72 is connected with the pin 1 of the pin 6 socket, the pin 76 is connected with the pin 2 of the pin 6 socket, the pin 4 of the pin 6 socket is grounded, and the pin 6 of the pin 6 socket is connected with the positive electrode of the power supply; pin 12 is connected to one end of a crystal oscillator Y1 and one end of a capacitor C23, pin 13 is connected to the other end of a crystal oscillator Y1 and one end of a capacitor C24, the other end of the capacitor C24 is connected to the other end of a capacitor C23 and grounded, pin 14 is connected to one end of a capacitor C25 and one end of a resistor R8, the other end of the capacitor C25 is grounded, the other end of the resistor R8 is connected to the positive electrode of a power supply, pin 94 is connected to one end of a resistor R7, and the other end of the resistor R7 is grounded.

In a specific embodiment, the method further comprises the following steps: and the data processing module 8 is electrically connected with the MCU processor 1 through a second output interface, and the data processing module 8 is electrically connected with the MCU processor 1 through a second output interface.

In a specific embodiment, the method further comprises the following steps: and the data display module 5 is electrically connected with the MCU processor 1 through a first output interface.

In a specific embodiment, the method further comprises the following steps: and the interface module 6 is electrically connected with the MCU processor 1 through a communication interface.

Specifically, the interface module 6 may be an RS485 interface.

In a specific embodiment, the method further comprises the following steps: the input end of the analog-to-digital conversion module 9 is electrically connected with the operational amplification module 7, the output end of the analog-to-digital conversion module 9 is electrically connected with the MCU processor 1, and the analog-to-digital conversion module 9 is used for sampling conversion.

Specifically, the MCU processor 1 may use a high performance single chip microcomputer whose model is STM32H750VB, the analog-to-digital conversion module 9 may use a 6-channel synchronous sampling AD chip ADs8365 to perform high speed synchronous conversion, and chips, sensors, and circuits used by the remaining modules are all conventional choices in the prior art.

The utility model discloses mainly include following process at the monitoring process: the voltages Ua, Ub and Uc are respectively isolated and sampled by a voltage transformer, a current transformer is used for isolating and sampling a reference current Ir, and a residual current CT is used for isolating and sampling the residual current Id of each circuit; the voltage sampling is converted into VA, VB and VC three low-level analog signals through the operational amplification module, the signal of each residual current is converted into an analog signal through the operational amplification module, the signal of the reference current is converted into Ir analog signals through the operational amplification module, the analog-to-digital conversion module starts sampling conversion after receiving the Ir analog signals, an AD chip of the analog-to-digital conversion module can complete within 16.5 clock cycles of the working frequency of the AD chip and inform a single chip microcomputer of EOC (input output) signal reading, the data acquired by the MCU processor are subjected to data processing to obtain the insulation resistance value and the capacitance value of a circuit, and the capacitance-resistance separation of the residual current is realized.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a TT power supply system residual current resistance-capacitance disconnect-type electric fire monitors detector which characterized in that includes:

an MCU processor (1);

the voltage sampling module (2), the voltage sampling module (2) is electrically connected with the MCU processor (1) through a first input interface;

the residual current sampling module (3) is electrically connected with the MCU processor (1) through a second input interface;

the reference current sampling module (4), the reference current sampling module (4) pass through the third input interface with MCU treater (1) electric connection.

2. The TT power supply system residual current resistance-capacitance separation type electric fire monitoring detector as claimed in claim 1, further comprising: the voltage sampling module (2), the residual current sampling module (3) and the reference current sampling module (4) are also connected with an operational amplification module (7).

3. The TT power supply system residual current resistance-capacitance separation type electric fire monitoring detector as claimed in claim 1, further comprising: the data processing module (8), the data processing module (8) pass through the second output interface with MCU treater (1) electric connection.

4. The TT power supply system residual current resistance-capacitance separation type electric fire monitoring detector as claimed in claim 1, further comprising: the data display module (5), the data display module (5) through first output interface with MCU treater (1) electric connection.

5. The TT power supply system residual current resistance-capacitance separation type electric fire monitoring detector as claimed in claim 1, further comprising: the interface module (6), the interface module (6) through communication interface with MCU treater (1) electric connection.

6. The TT power supply system residual current resistance-capacitance separation type electric fire monitoring detector as claimed in claim 2, further comprising: the input end of the analog-to-digital conversion module (9) is electrically connected with the operational amplification module (7), and the output end of the analog-to-digital conversion module is electrically connected with the MCU processor (1).