CN102928717A - Relay protection tripping matrix test system - Google Patents

Abstract

The invention provides a relay protection tripping matrix test system, including PLC, action indicator lights and man-machine interface; the relay protection tester sends out fault pulse signals to the PLC; The trip outlet of the device, and the output interface used to indicate the switch action, connect the action indicator light, the action indicator light corresponds to the trip outlet, and the hardware number is the same; there is a program stored in the PLC, and the program passes through the input interface used to collect the switch action Receive the action signal of the trip outlet contact of the protection device, if the trip outlet contact acts, send a light signal to the action indicator light through the output interface used to indicate the switch action. The invention only needs to simulate various faults, and can intuitively display the action conditions and action time of each outlet on the indicator light and the touch screen, simplify the debugging process, shorten the debugging time, improve on-site work efficiency, have rich hardware interfaces, and strong function expansion .

Description

Relay Protection Trip Matrix Test System

technical field

The invention is mainly applied in the field of relay protection of electric power system, and is mainly applied in the exit logic detection of protection devices with many tripping exits, such as transformer protection, bus differential protection and failure protection.

Background technique

In the field of power system relay protection, fast and accurate removal of various faults is an important guarantee for the safe and stable operation of the power system. For some protection devices with more complex trip outlets, such as transformer protection, bus differential protection, failure protection, etc., a lot of work needs to be done on the trip outlet circuit during debugging. For such more complicated protection devices at outlets, relay protection debugging The commonly used method in the work is to use a multimeter to test the continuity of the outlet terminal, especially in the test of the trip matrix of the transformer protection outlet, the maximum number of tests can reach one or two hundred times, which not only takes time, but also easily error. Therefore, there are serious problems of low efficiency and unintuitive test results in traditional testing methods.

At present, there is a main transformer tripping matrix inspection device, which can test a large number of outlets at one time, greatly improving the work efficiency, but there are still great deficiencies. The trip matrix inspection device of the main transformer mainly relies on hardware to detect the trip matrix, which is easy to cause errors in test results due to hardware errors, and may even cause incorrect test results.

Contents of the invention

The purpose of the present invention is: for the current problems existing in the testing work of this type of protection trip exit matrix, the present invention provides an effective solution, and the exit logic required for verification of each protection can be directly connected once displayed intuitively.

The technical scheme adopted in the present invention is:

Relay protection trip matrix test system, the AC output of the relay protection tester is connected to the AC input of the protection device, and the relay protection trip matrix test system includes PLC, action indicator light and man-machine interface;

The PLC is connected to the fault pulse output terminal of the relay protection tester through the working switch interface, and the relay protection tester sends a fault pulse signal to the PLC;

The PLC is equipped with several input interfaces for collecting the switching action and several output interfaces for indicating the switching action. The number of the two is the same, and each input interface for collecting the switching action is connected to one of the protection devices. The trip outlet and each output interface used to indicate the action of the switch are connected to an action indicator light. The action indicator light corresponds to the trip outlet of the protection device one by one, and the hardware number is the same;

The PLC internally stores programs and logical operation instructions for executing the programs, and receives the action signal of the trip outlet contact of the protection device through the above-mentioned input interface for collecting switch action conditions. The output interface sends a lighting signal to the action indicator light;

The PLC is connected to the human-machine interface through the communication serial port to set and modify the parameters of the above-mentioned PLC internal program, and at the same time display the results of the PLC internal program after execution.

The PLC is provided with a light test switch, and a light test program is stored inside the PLC. After the light test switch is closed, the PLC sends a lighting signal to all the action indicator lights through the output interface used to indicate the action of the switch, and the test action indicator light hardware system.

The PLC internally stores a program for setting numbers for tripping exits and action indicator lights of the protection device. The PLC inputs the above-mentioned switch numbers through the man-machine interface, and the man-machine interface transmits the data to the PLC flash memory through the serial port.

The PLC internally stores the relay protection tripping matrix test software, and starts the software through the man-machine interface:

First, the working switch interface judges the working state of the relay protection tester, and the relay protection tester sends out a fault pulse to enter the next step, otherwise return to the previous step;

Secondly, the PLC sends a working signal to the internal timer, starts timing, and displays the timing status on the man-machine interface;

Then, according to the hardware serial number sequence of the input interface used to collect the switch action and the output interface used to indicate the switch action corresponding to each group, the trip outlet contact of the protection device is tested in turn. If the trip outlet contact is activated, the drive The corresponding action indicator lights up, and the test results are displayed on the man-machine interface.

The PLC is provided with a reset switch and internally stored with reset software. After the reset switch is closed, the PLC sends an extinguishing signal to all the action indicator lights through the output interface used to indicate the action of the switch, and the man-machine interface returns to the initial state.

The man-machine interface is a device for input and output through a touch screen.

The beneficial effects produced by the present invention are:

In the relay protection tripping matrix test system of the present invention, all the trip outlet circuits of the protection device are connected to the test system, and only need to simulate various faults, the action status and status of each outlet can be intuitively displayed on the indicator light and the touch screen. The action time simplifies the debugging process, shortens the debugging time, and improves the work efficiency on site. The relay protection tripping matrix test system of the present invention can not only record the action of each outlet, but also record the relative time of the action (the action time is accurate to 1ms), and even preset the switch number corresponding to each outlet. After the first experiment, the action status and action time of each switch can be directly displayed on the touch screen. After using the test system, only one-time wiring is required, and each type of protection only needs to conduct a simulated fault experiment, and the action status and action time of each switch under the fault can be displayed intuitively.

The function of the present invention is relatively similar to that of the current main transformer tripping matrix inspection device, but there are differences and more abundant functions. First, the main transformer trip matrix inspection device mainly relies on hardware to realize the detection of the trip matrix, which is easy to cause errors in test results due to hardware errors, and may even cause incorrect test results; while the main functions of the present invention are realized by software, using a powerful The programmable logic controller completes various more abundant functions, the device has strong self-inspection ability, and the hardware interface is rich, and the function expandability is strong. Second, the present invention is equipped with a friendly man-machine interface, and the switch number of the corresponding outlet connected to the test system can be set on the touch screen to make the result more intuitive. For example, the trip logic of each switch (including whether to trip and trip time) can It is intuitively displayed on the touch screen, and even the function of printing reports can be extended. Third, the trip exit indicator light equipped with the device can indicate the status of each exit (with hold) during each test. For some occasions that only need to test whether the exit is active, it is more convenient to check the exit indicator light. In order to prevent Due to the misjudgment caused by hardware damage, the present invention also provides a lamp test program for detecting the correctness of the hardware device of the tripping exit indicator light.

Description of drawings

Fig. 1 is the hardware schematic diagram of relay protection tripping matrix testing system of the present invention;

Fig. 2 is a schematic diagram of the program flow of the relay protection tripping matrix testing system of the present invention.

Detailed ways

As shown in Figures 1 and 2, the present invention provides a relay protection tripping matrix test system. The AC output terminal of the relay protection tester is connected to the AC input terminal of the protection device. The concrete technical scheme of the present invention is described respectively below with hardware device and software method:

(1) Hardware device:

The relay protection tripping matrix test system of the present invention includes PLC, action indicator light and man-machine interface, and the hardware connection is very simple. The basic block diagram is shown in FIG. 1 .

There are several digital input interfaces and several digital output interfaces on the PLC, among which: there is a working switch interface connected to the fault pulse output terminal of the relay protection tester, and the relay protection tester sends fault pulse signals to the PLC. There are several input interfaces for collecting switch action and several output interfaces for indicating switch action, the number of them is the same, and each input interface for collecting switch action is connected to a tripping outlet of the protection device, Each output interface used to indicate the action of the switch is connected to an action indicator light, which corresponds to the tripping outlet of the protection device one by one, and their hardware numbers are the same. In addition, there are three switching value input interfaces, which are respectively used to start the timing, reset and test the lamp, which are called timing switch, reset switch and lamp test switch.

The PLC internally stores programs and logic operation instructions for executing programs, and can complete various logic functions, including lamp test programs, switch number input programs, test programs, and reset programs. The PLC internal program receives the action signal of the trip outlet contact of the protection device through the above-mentioned input interface used to collect the switch action, and if the trip outlet contact acts, it sends a light signal to the action indicator through the output interface used to indicate the switch action , and at the same time, the action status and action time of the switch are displayed on the man-machine interface.

The PLC is connected to the human-machine interface through the communication serial port to set and modify the parameters of the above-mentioned PLC internal program, and at the same time display the results of the PLC internal program after execution. In this specific embodiment, the man-machine interface is a device for inputting and outputting through a touch screen. The data is transmitted between the PLC device and the touch screen input and output device through the serial port, and the touch screen input and output device completes the switch number setting (transmitted to the PLC flash memory through the serial port, and the data will not be lost when the power is turned off), and the function of displaying the action result.

In addition: all the above-mentioned PLC switching input interfaces (i.e. working switch interface, input interface for collecting switch action, etc.) are used to collect fault timing contacts, reset signals, light test signals and tripping outlets from various protection devices. Contact, binary input power supply is 24V. The above-mentioned PLC switching value output interface (that is, the output interface used to indicate the switching action) is used to light up the LED lights for each trip exit, and the connected power supply is 24V.

(2) Software method:

All functions of the present invention are realized by programs, the core technology is the PLC internal program, and the parameters of the above-mentioned PLC internal program are set and modified through the touch screen input and output device, and the results after the execution of the PLC internal program are displayed at the same time.

There is a light test switch on the PLC, and a light test program is stored inside the PLC. After the light test switch is closed, the PLC sends a lighting signal to all the action indicator lights through the output interface used to indicate the switch action, and the hardware system of the test action indicator light is tested. Is it normal.

The PLC internally stores a program for setting numbers for the tripping exits and action indicators of the protection device. Input the number of each switch through the touch screen, and the touch screen transmits the data to the PLC flash memory through the serial port, so that the data will not be lost when the power is off.

The relay protection tripping matrix test software is stored inside the PLC, which is the key technology of the present invention. After starting the software through the man-machine interface:

First, the working switch interface judges the working state of the relay protection tester, and the relay protection tester sends out a fault pulse, then enters the next step, otherwise returns to the previous step;

Secondly, the PLC sends a working signal to the internal timer, starts timing, and displays the timing status on the man-machine interface;

Then, according to the hardware serial number sequence of each corresponding input interface used to collect the switch action and the output interface used to indicate the switch action, the trip outlet contact of the protection device is tested in turn. If the trip outlet contact acts, then The corresponding action indicator light of the driver lights up, and the test results (including action conditions and relative action time) are displayed on the man-machine interface.

A reset switch is set on the PLC, and reset software is stored inside. After the reset switch is closed, the PLC sends a extinguishing signal to all the action indicator lights through the output interface used to indicate the switch action, and the man-machine interface returns to the initial state.

The present invention realizes through the following steps to the process of relay protection tripping matrix test, as shown in the software flowchart of Fig. 2:

1. Wiring: Connect the output contact of the relay protection tester to the trip matrix test system (this contact needs to be opened and connected to start the timing of the trip matrix test system when simulating a fault); The outlet contact is connected to the trip matrix test system;

2. Power on: Power on to enter the welcome interface, and display the current time at the same time, click "Enter System" to switch to the test interface;

3. Set the switch number: The currently displayed switch number defaults to the switch number of the last test (the data is saved in the FLASH chip of the PLC, and it will not disappear after power failure). If there is no need to change it, you can directly test it. If you need to change it, click The "Setting" button can reset the switch number that needs to be changed;

4. Light test: In order to avoid damage to the light-emitting diodes and cause wrong judgments on the trip matrix, it is necessary to test the hardware indication circuit of the device before the test. The specific method is to press the test lamp button at the bottom of the touch screen, and all the indicator diodes of the trip outlet should light up, and after releasing it, all the indicator diodes will go out.

5. Trip matrix test: Put the trip outlet pressure plate on the protection screen, and use the relay protection tester to simulate the fault. After the protection action, the action status and action time of each switch can be obtained on the touch screen. After recording the test results, press the "Reset" button to clear the data and enter the next test.

Claims (6)

1. Relay protection trip matrix test system, the AC output of the relay protection tester is connected to the AC input of the protection device, it is characterized in that: the relay protection trip matrix test system includes PLC, action indicator and man-machine interface; The PLC is connected to the fault pulse output terminal of the relay protection tester through the working switch interface, and the relay protection tester sends a fault pulse signal to the PLC; The PLC is equipped with several input interfaces for collecting the switching action and several output interfaces for indicating the switching action. The number of the two is the same, and each input interface for collecting the switching action is connected to one of the protection devices. The trip outlet and each output interface used to indicate the action of the switch are connected to an action indicator light. The action indicator light corresponds to the trip outlet of the protection device one by one, and the hardware number is the same; The PLC internally stores programs and logical operation instructions for executing the programs, and receives the action signal of the trip outlet contact of the protection device through the above-mentioned input interface for collecting switch action conditions. The output interface sends a lighting signal to the action indicator light; The PLC is connected to the human-machine interface through the communication serial port to set and modify the parameters of the above-mentioned PLC internal program, and at the same time display the results of the PLC internal program after execution. 2. The relay protection tripping matrix test system according to claim 1, characterized in that: said PLC is provided with a light test switch, and the PLC internally stores a light test program. After the light test switch is closed, the PLC passes through to indicate The output interface of the switch action status sends a lighting signal to all action indicator lights to test the hardware system of the action indicator lights. 3. The relay protection tripping matrix testing system according to claim 1, characterized in that: said PLC internally stores a program for setting numbers for the tripping outlet and the action indicator light of the protective device, and the PLC inputs the above-mentioned parameters through the man-machine interface. The number of the road switch, the man-machine interface transmits the data to the PLC flash memory through the serial port. 4. according to claim 1 or 3 described relay protection tripping matrix testing systems, it is characterized in that: described PLC interior is stored with relaying protection tripping matrix testing software, starts software by man-machine interface: First, the working switch interface judges the working state of the relay protection tester, and the relay protection tester sends out a fault pulse to enter the next step, otherwise return to the previous step; Secondly, the PLC sends a working signal to the internal timer, starts timing, and displays the timing status on the man-machine interface; Then, according to the hardware serial number sequence of the input interface used to collect the switch action and the output interface used to indicate the switch action corresponding to each group, the trip outlet contact of the protection device is tested in turn. If the trip outlet contact is activated, the drive The corresponding action indicator lights up, and the test results are displayed on the man-machine interface. 5. The relay protection tripping matrix test system according to claim 1, characterized in that: the PLC is provided with a reset switch, internally stored with reset software, after the reset switch is closed, the PLC passes through the indicator for indicating the action of the switch The output interface sends a extinguishing signal to all action indicator lights, and the man-machine interface returns to the initial state. 6. The relay protection trip matrix testing system according to claim 1, characterized in that: the man-machine interface is a device for input and output through a touch screen.

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