CN212781196U - Loop reliability testing device based on TTL level communication - Google Patents

Abstract

The utility model discloses a return circuit reliability testing arrangement based on TTL level communication, its characteristic includes: the device comprises a power supply, a master control CPU, an LCD display, an LED indicator lamp, a buzzer, a key and a signal transceiving module. The utility model discloses can measure its secondary side ground reliability under the mutual-inductor operation or the outage circumstances, compensate the not enough condition of current trade instrument, increase production utility tool for electric power maintainer.

Description

Loop reliability testing device based on TTL level communication

Technical Field

The utility model discloses electric power system secondary cable detection area, specific return circuit reliability testing arrangement based on TTL level communication that says so.

Background

The transformer of the power system mainly measures the main parameters of the line such as voltage, power, current and electric energy of the line and is used for protection, measurement and the like. A high-voltage loop is connected to the primary side of the mutual inductor, and the secondary side of the mutual inductor must be reliably grounded in order to ensure the safety of personnel and equipment on the secondary side; the measurement accuracy is ensured, and the secondary side cannot be grounded in multiple points; therefore, the secondary side of the transformer must be grounded at one point, and only one point is grounded.

At present, a multi-point grounding fault finder for the secondary side of a common mutual inductor on the market does not have a reliable grounding tester for the secondary side of the mutual inductor, and whether the grounding of the secondary side of the mutual inductor is reliable or not can not be maintained, and the grounding can only be confirmed before capital construction operation when power is cut off in overhaul.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a solve the weak point that above-mentioned prior art exists, provide a return circuit reliability testing arrangement based on TTL level communication to can measure its secondary side ground reliability under the mutual-inductor operation or the outage condition in phase, compensate the not enough condition of current trade instrument, increase production utility for electric power maintainer.

The utility model discloses a solve technical problem and adopt following technical scheme:

the utility model relates to a return circuit reliability testing arrangement's characteristics based on TTL level communication include: the device comprises a device power supply, a master control CPU, an LCD display, an LED indicator lamp, a buzzer, a key and a signal transceiving module;

the LCD display is connected with the main control CPU and used for displaying test sending signals, test receiving signals and line connection states;

the LED indicator lamp comprises a power indicator lamp and a fault indicator lamp, is respectively connected with the main control CPU and is used for displaying the fault state of the device and the fault state of the line to be detected under the working state of the device;

the buzzer is connected with the main control CPU and used for alarming the fault state of the detected line;

the keys comprise switch keys and test keys, are respectively connected with the main control CPU and are used for starting and stopping the device and starting and stopping the test function;

the device power supply is connected with each module and supplies power to each module.

Loop reliability test device's characteristics also lie in: the signal transceiving module comprises a signal transmitting circuit and a signal receiving circuit;

the signal transmitting circuit receives TTL level signals transmitted by an I/O port of a pin P0.0 of the singlechip of the main control CPU, and transmits the TTL level signals to a tested circuit after sequentially passing through a resistor R1, an optocoupler U1 and a resistor R3;

the signal receiving circuit is an I/O port of a P0.1 pin of a singlechip P which transmits a signal returned by a tested line to the main control CPU after passing through a resistor R4 and an optocoupler U2 in sequence.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the device of the utility model communicates by sending TTL level, and the level receiving and sending design high-voltage isolation circuit ensures the safety of the device; the communication level takes the tested circuit as a communication channel, the tested loop is used for constructing the communication channel, and the reliability of the communication channel is judged through the receiving and signaling results, so that the line connection reliability of the tested circuit is judged according to the quality of the communication channel.

2. The utility model discloses the device utilizes TTL level communication mode as test signal, does not have the influence to the operational equipment, can be used to power system mutual-inductor secondary side ground reliability to detect, can ensure equipment, personnel and system safety, and equipment has solved electric power protection personnel and has detected the work use tool problem at PT CT secondary side ground reliability.

Drawings

FIG. 1 is a structural diagram of the device of the present invention;

fig. 2 is a schematic diagram of the signal transceiver module of the present invention.

Detailed Description

In this embodiment, as shown in fig. 1, a loop reliability testing device based on TTL level communication is divided into a device power supply, a main control CPU, an LCD display, an LED indicator, a buzzer, a key, and a signal transceiver module.

The power supply of the device is composed of 2 No. 5 batteries, is convenient to carry, is connected with each module and supplies power to each module.

The main control CPU selects an Intel 80c51 singlechip to realize the functions of receiving keys, controlling signals, calculating, displaying and indicating, etc.

The LCD display selects a 2.13-inch black-and-white screen, has the characteristic of low power consumption, and meets the requirements of less item display content, low power consumption of a portable instrument power supply and the like. The LCD display is connected with the main control CPU and used for displaying test sending signals and receiving signals and line connection states;

the LED indication design comprises 2 LEDs, a power supply indication and a fault indication which are respectively connected with a main control CPU. When the power supply meets the requirement that the equipment works, the power supply indication LED is turned on to light; the fault indication is that after the test key is pressed, the signal cannot be measured, the connection of the tested circuit is abnormal, and the alarm indication is given.

The buzzer is designed with a small buzzer and is connected with the main control CPU, after a test key is pressed down, a signal cannot be measured, the connection of a tested circuit is abnormal, and the buzzer gives an alarm to prompt a tester.

The keys are designed as switch keys and test keys. And are respectively connected with a main control CPU, and the switch key functions as a power switch of the equipment; the test key starts a test function, and when the test key is pressed, the test key automatically rebounds, and when the test key is pressed, the test key receives the test key to start the test function.

The signal transceiver module is designed with a TTL level transmitting and receiving circuit to realize the generation and the receiving of the measuring signal, the CPU controls the signal transmitting and judges the connection reliability of the tested loop according to the receiving signal.

As shown in fig. 2, the signal transmission circuit comprises a single chip P0.0I/O port, a resistor R1, an optocoupler U1 and a resistor R3; TTL level signals are output from an I/O port of a P0.0 pin and are isolated by an optical coupler to be emitted.

The signal receiving circuit comprises an I/O port of a P0.1 pin of the singlechip, a resistor R2, an optocoupler U2 and a resistor R4; the transmitted TTL level returns to an optical coupler U2 through a tested loop, and the optical coupler is received by a P0.1I/O port after being isolated; wherein, the resistor R2 is a pull-up resistor and is connected to the power supply inside the equipment; the resistor R3 and the resistor R4 are connected with a tested circuit, the resistor R3 sends and the resistor R4 receives;

when testing the circuit, the meter pen can be reliably connected on the tested circuit, the test key is pressed, the port P0.0 sends out a 01010101 test code, if the port P0.1 receives a 01010101 signal, the tested circuit is well connected; if the received signal loses data, the connection is not reliable; and if the data cannot be received, the circuit is disconnected.

Claims (1)

1. A loop reliability testing device based on TTL level communication is characterized by comprising: the device comprises a device power supply, a master control CPU, an LCD display, an LED indicator lamp, a buzzer, a key and a signal transceiving module;

the LCD display is connected with the main control CPU and used for displaying test sending signals, test receiving signals and line connection states;

the LED indicator lamp comprises a power indicator lamp and a fault indicator lamp, is respectively connected with the main control CPU and is used for displaying the fault state of the device and the fault state of the line to be detected under the working state of the device;

the buzzer is connected with the main control CPU and used for alarming the fault state of the detected line;

the keys comprise switch keys and test keys, are respectively connected with the main control CPU and are used for starting and stopping the device and starting and stopping the test function;

the signal transceiving module comprises a signal transmitting circuit and a signal receiving circuit;

the signal transmitting circuit receives TTL level signals transmitted by an I/O port of a pin P0.0 of the singlechip of the main control CPU, and transmits the TTL level signals to a tested circuit after sequentially passing through a resistor R1, an optocoupler U1 and a resistor R3;

the signal receiving circuit transmits a signal returned by a tested line to an I/O port of a P0.1 pin of a singlechip P of the main control CPU after passing through a resistor R4 and an optocoupler U2 in sequence;

the device power supply is connected with each module and supplies power to each module.

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