CN204229223U - Phase selection controller test system in intelligent substation - Google Patents

Abstract

The utility model discloses a phase-selection closing controller test system in an intelligent substation, which comprises an analog output unit, a merging unit, a device to be tested and a wave recorder. The analog output unit is used for providing analog output; the merging unit is used for collecting analog information, and send the collected analog information to the device under test; the device under test includes a phase selection closing controller and an exit relay, which are used for phase selection closing control, and drive the exit relay trigger according to the received data sent by the merging unit. The point is closed; the recorder can record and store analog and digital quantities. The test system of the utility model can not only find out the contact closing time of the export relay and the zero-crossing time of the three-phase sine wave signal by checking and comparing the waveforms recorded by the wave recorder, but also calculate the contact closing time of the export relay and the crossing time of the three-phase sine wave signal. The difference of the zero point time can obtain the accuracy of phase selection closing, and can correct the error of the phase selection closing controller test system.

Description

Phase selection closing controller test system in smart substation

technical field

The utility model belongs to the technical field of electric power system substation automation, in particular to a test system for a phase-selection closing controller in an intelligent substation.

Background technique

When the switchgear is opened and closed, the initial phase angles of the system voltage and current are usually random, especially when the no-load transformer, capacitor bank, shunt reactor and no-load line are closed, a high-amplitude inrush current is often generated Overvoltage and overvoltage will not only cause harm to the switchgear itself, but also cause the relay protection device to malfunction, affect the action behavior of the relay protection and the electrical life of the circuit breaker, and even endanger the normal operation of the power system.

In the 1990s, foreign countries proposed the method of phase selection and closing. With the improvement of switch manufacturing technology, the discreteness of switching equipment closing time is reduced. my country also uses phase selection closing technology in 500KV converter stations. The purpose is to solve the problem of capacitive components in 500KV AC filters and reactive power compensation appliances The problem of high failure. The phase-selection closing technology can greatly reduce the overcurrent and overvoltage of the switchgear during the closing operation, thereby improving the life of the power equipment and the stability of the power system.

The phase selection closing controller is used as the closing phase control of the switchgear, and it is also an intelligent switch opening and closing control technology. For line circuit breakers, selecting the appropriate closing phase of the circuit breaker can reduce the closing transient overvoltage caused by long-term no-load line charging; for circuit breakers that control reactive power compensation capacitors and filter switching, control the closing The phase can reduce the surge current impact caused by switching on the power capacitor, thereby reducing or even eliminating the related electromagnetic impact effect.

At present, there is no instrument that can test the performance of the phase selection closing controller. Since the time after closing of the circuit breaker may be affected by the environment, the size of the operating voltage, the discrete type of the outlet relay, etc., the phase selection closing controller needs to compensate for these effects. In order to check whether the phase selection closing controller has the required outlet relay Discrete compensation and voltage compensation functions require special test systems or equipment to test them. In addition, instruments that can detect and test the phase selection and closing controller system or equipment are also needed, so as to detect whether the test product meets the required technical functions and performances.

At present, there is no special test system or instrument that can be used for the performance test of the phase selection closing controller, and there is no system or equipment for testing the testing system or equipment for testing the performance of the phase selection closing controller.

Utility model content

The purpose of the utility model is to provide a phase selection closing controller test system in an intelligent substation to test the closing accuracy and dispersion of the phase selection closing controller and display the test result information.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a phase selection closing controller test system in an intelligent substation, the system includes:

An analog output unit for providing analog output;

The merging unit is used to collect analog information, and convert the collected analog information into digital information and send it to the device under test;

The device under test includes a phase selection closing controller and an exit relay, which are used for phase selection closing control, and drive the exit relay contacts to close according to the received data sent by the merging unit;

Wave recorder, capable of recording and storing analog and digital waves.

The merging unit has two sets of input channels U1 and U2 and an SV output interface, and the U1 and U2 channels both include 3 sub-channels corresponding to the three-phase voltage input, and are respectively corresponding to the three-phase output voltage connected to the analog output unit; An outlet relay of the device under test is connected in series between the U2 channel and the analog output unit.

The oscilloscope includes at least 3 input channels CHL1, CHL2 and CHL3, each input channel has three sub-channels, the three sub-channels of CHL1 are respectively connected to the three-phase output voltage of the analog output unit; the three sub-channels of CHL2 Corresponding to the three sub-channels connected to the U2 channel of the merging unit; CHL3 connected to the SV output interface of the merging unit.

The analog output unit provides the same analog input source for the U1 and U2 channels of the merging unit and the CHL1 channel of the oscilloscope.

The analog output unit outputs a three-phase sine wave voltage with a frequency of 50 Hz, and the voltage difference between each phase is 120°.

After the two sets of input channels of the merging unit collect analog information and convert it into digital quantities, according to the IEC61850-9 standard, the multi-channel sampling data is combined and packaged into SV Ethernet data and sent to the device under test.

The outlet relay of the device under test is a normally open contact.

The phase-selection closing controller test system in the intelligent substation of the utility model is used for testing the phase-selection closing controller in the intelligent substation, and displays the test result information. Point closing time and three-phase sine wave signal zero-crossing time, calculate the difference between the outlet relay contact closing time and three-phase sine wave signal zero-crossing time, get the accuracy of phase selection closing, and can correct the phase selection closing controller The error of the test system makes up for the defects of the prior art. This test method can make the closing time more accurate.

Description of drawings

Fig. 1 is a schematic diagram of the utility model testing system;

Fig. 2 is the wave recorder 4 CHL3 wave recording result display figure of the utility model;

Fig. 3 is the wave recording result display figure of wave recorder 4 CHL1 of the present utility model;

Fig. 4 is the wave recorder 4 CHL2 wave recording result display figure of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is further introduced.

As shown in Figure 1, it is a schematic diagram of an embodiment of a phase selection and closing controller test system in a smart substation of the present invention. As can be seen from the figure, the system includes: an analog output unit, a merging unit, a device under test and a wave recorder, etc., wherein , the analog output unit is used to provide analog output, including AC and DC; the merging unit is used to collect analog information, and convert the collected analog information into digital information and send it to the device under test; the measured The equipment, including the phase selection closing controller and the exit relay, is used for the phase selection closing control, receives the data sent by the merging unit, sends and receives the GOOSE command, and calculates the appropriate closing phase by analyzing and processing the received data, and in a specific Send within a certain period of time, and drive the outlet relay contact to close; the wave recorder can record and store analog and digital waves, and has a user interface display function. Among them, the analog output unit is connected to the CHL1 channel of the oscilloscope and the U1 and U2 channels of the merging unit; the SV output interface of the merging unit is connected to the SV receiving port of the device under test and the CHL3 channel of the oscilloscope; the outlet of the device under test The relay contacts are connected in series on the connecting line between the U2 channel of the merging unit and the analog output unit.

As shown in Figure 1, the merging unit of this embodiment has two sets of input channels U1 and U2 and one SV output interface. The U1 channel includes three sub-channels, namely U1A, U1B, and U1C three-phase voltage input channels, which are respectively connected to analog The A-phase output voltage UA, B-phase output voltage UB and C-phase output voltage UC of the output unit; the U2 channel includes U2A, U2B, and U2C three-phase voltage input channels, which correspond to the A-phase output voltage UA and B of the analog output unit respectively. phase output voltage UB and phase C output voltage UC.

After the two sets of input channels of the merging unit collect analog information and convert it into digital quantities, according to the IEC61850-9 standard, the multi-channel sampling data is combined and packaged into SV Ethernet data and sent to the device under test.

In addition, there is an outlet relay of the device under test on the connection line between the U2 channel of the merging unit and the analog output unit. The outlet relay of the device under test is a normally open contact, and the three phases correspond to the A-phase outlet relay and B-phase outlet relay respectively. And C-phase outlet relay, A-phase outlet relay is connected in series on the connection line between the U2A channel of the merging unit and the A-phase voltage of the analog output unit, and the B-phase outlet relay is connected in series on the connection line between the U2B channel of the merging unit and the B-phase voltage of the analog output unit On the top, the C-phase outlet relay is connected in series with the connection line between the U2C channel of the merging unit and the C-phase voltage of the analog output unit.

The oscilloscope includes 3 input channels CHL1, CHL2 and CHL3, and each input channel has three sub-channels. The three sub-channels CHL1A, CHL1B and CHL1C of CHL1 correspond to the three-phase output voltages UA, UB and UC; the three sub-channels CHL2A, CHL2B and CHL2C of CHL2 respectively correspond to the three sub-channels U2A, U2B and U2C of the U2 channel connected to the merging unit; CHL3 is connected to the SV output interface of the merging unit. That is to say, the CHL1 and CHL2 channels of the oscilloscope are connected to analog signals for analog wave recording and storage; the CHL3 of the oscilloscope is connected to digital channels for digital wave recording.

The analog output unit provides the same analog input source for the U1 channel, U2 channel of the merging unit and the CHL1 channel of the oscilloscope; the analog output unit outputs a three-phase sine wave voltage with a frequency of 50Hz, and the difference between each phase voltage is 120°.

The test system utilized by the test method of the utility model includes an analog output unit, a device under test, a merging unit and a wave recorder, and the analog output unit is connected to the wave recorder CHL1 channel and the merging unit U1, U2 channels at the same time, and the measured The equipment includes a phase-selection closing controller and an exit relay, and the exit relay contacts are connected in series on the connection line between the U2 channel of the merging unit and the analog output unit; the U2 channel of the merging unit is connected to the CHL2 channel of the oscilloscope; the SV of the merging unit The output interface is connected to the CHL3 of the device under test and the wave recorder at the same time; the test method includes the following steps:

(1) Turn on the analog output unit to output a three-phase AC sine wave voltage signal, the output voltage is 57.74V, and the frequency is 50Hz; configure the SV sending data of the merging unit to make it consistent with the SV receiving configuration of the device under test; turn on Wave recorder, set CHL1 and CHL2 to record and store analog waves, set CHL3 to record and store digital waves, click the start button to start wave recording;

(2) After the device under test receives the phase selection closing command, it drives the outlet relay contact to close, the U2 channel of the merging unit is connected to the connection line of the analog output unit, and the U2 channel starts to collect analog data, which is processed and converted by the merging unit After the digital information is packaged into SV Ethernet data, it is sent to the device under test. At this time, the SV data includes the U1 channel data and U2 channel data of the merging unit;

(3) Check the waveform recorded by the oscilloscope, and judge the accuracy of the phase-selection closing controller of the tested phase-selection closing controller according to the waveform recorded by the oscilloscope.

The waveform recorded by the wave recorder CHL1 is the analog quantity directly output by the analog quantity output unit, which is equivalent to the U1 channel of the merging unit collecting the data of the analog quantity output unit after the wave recorder starts to record, that is, A, B, C three Phase-to-phase AC voltage, as shown in Figure 2; the waveform recorded by the oscilloscope CHL2 is the analog waveform starting when the outlet relay contact starts to close (that is, the closing time), also known as the zero-crossing waveform, which is also equivalent to the U2 channel acquisition What is the data of the analog output unit after the outlet relay of the device under test is closed, that is, the zero-crossing voltage of the three phases A, B, and C, as shown in Figure 3; the waveform recorded by the CHL3 of the merging unit is the digitized Waveforms, including U1 and U2 channels, a total of 6 groups of waveforms, of which U1A, U1B, and U1C of U1 channel are digitized CHL1 waveforms, and U2A, U2B, and U2C of U2 channel are digitized CHL2 waveforms, as shown in Figure 4.

As shown in Figure 4, by comparing and viewing the CHL3 channel waveform (the U1 channel and U2 channel data of the merging unit), you can find out the contact closure time of the exit relay and the zero-crossing time of the three-phase sine wave signal, and calculate the contact closure of the exit relay The difference between the time and the zero-crossing time of the three-phase sine wave signal can obtain the accuracy of phase selection and closing.

By comparing Figure 2 and Figure 4, you can see and compare the CHL1 channel waveform of the oscilloscope recorder (the analog quantity directly output by the analog output unit) and the 1, 2, and 3 channel waveforms of CHL3 (the analog quantity directly output by the analog output unit is combined. Unit digitized waveform) can verify whether the data collected by the merging unit U1 channel has distortion and delay, correct the source voltage data waveform of the recorder CHL3 channel, that is, the analog/digital conversion error, and improve the accuracy of the test system; by comparing Figure 3 And Figure 4, that is, to view and compare the CHL2 channel waveform (zero-crossing waveform) and CHL3 channel 4, 5, and 6 waveforms (the analog output directly output by the analog output unit is digitized by the merging unit), which can verify the U2 channel acquisition of the merging unit Whether there is distortion and delay in the data, correct the zero-crossing voltage data waveform of the CHL3 channel of the oscilloscope, that is, the digitization error of the zero-crossing waveform, and improve the accuracy of testing phase selection and closing.

The above embodiments are only used to help understand the core idea of the utility model, and cannot limit the utility model with this. For those skilled in the art, any modification or equivalent replacement of the utility model according to the idea of the utility model shall be carried out in specific implementation. All changes made in the manner and scope shall be included in the protection scope of the present utility model.

Claims (7)

1. A phase selection closing controller test system in an intelligent substation, characterized in that the system includes: An analog output unit for providing analog output; The merging unit is used to collect analog information, and convert the collected analog information into digital information and send it to the device under test; The device under test includes a phase selection closing controller and an exit relay, which are used for phase selection closing control, and drive the exit relay contacts to close according to the received data sent by the merging unit; Wave recorder, capable of recording and storing analog and digital waves. 2. The phase selection and closing controller test system in intelligent substation according to claim 1, characterized in that: the merging unit has two groups of input channels U1 and U2 and an SV output interface, and U1 and U2 channels all include three corresponding The three sub-channels of the phase voltage input are respectively corresponding to the three-phase output voltage of the analog output unit; the connection line between the U2 channel and the analog output unit is connected with the outlet relay of the device under test. 3. the phase selection closing controller test system in the smart substation according to claim 2, is characterized in that: the oscilloscope comprises at least 3 input channels CHL1, CHL2 and CHL3, each input channel has three sub-channels, The three sub-channels of CHL1 correspond to the three-phase output voltage connected to the analog output unit; the three sub-channels of CHL2 correspond to the three sub-channels of the U2 channel connected to the merging unit; CHL3 connects to the SV output interface of the merging unit. 4. The phase-selection closing controller test system in the smart substation according to claim 3, characterized in that: the analog output unit provides the same analog input source for the U1 channel, the U2 channel of the merging unit and the CHL1 channel of the oscilloscope . 5. The phase selection closing controller test system in a smart substation according to claim 4, wherein the analog output unit outputs a three-phase sine wave voltage with a frequency of 50 Hz, and the voltage difference between each phase is 120°. 6. The phase selection and closing controller test system in intelligent substation according to claim 1, characterized in that: after the two groups of input channels of the merging unit collect analog information and convert it into digital quantities, according to the IEC61850-9 standard, the multi-channel The sampled data is combined and packaged into SV Ethernet data and sent to the device under test. 7. The test system for the phase selection closing controller in the intelligent substation according to claim 2, characterized in that: the outlet relay of the device under test is a normally open contact.