RU2616497C1 - Method for periodic testing of digital substation - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: method for the periodic testing of a digital substation consists in that the digital terminals of relay protection periodically form test sequences for controlling the performance of each protection. Test signals are formed, which differ from operating signals. The test signals are set to the measuring current and voltage transformers and to the high-voltage circuit breakers control systems. Response test signals are received. The sent test signals trigger the protection. The current and voltage transformers receive and send back the received signals in parallel with the operating ones. The received signals are treated by the relay protection terminals in parallel with the operating input signals.

EFFECT: periodic testing without the tested equipment withdrawal from operation.

2 dwg

Description

The invention relates to the electric power industry, and in particular to a method for constructing a testing process for electric power equipment of a substation incorporating electronic devices and a computing module.

A known method of constructing a computational process for testing electronic devices in the production process using diagnostic tests, which consists in the fact that the computational process for testing electronic devices is implemented in a computational module, and the control equipment performs its indication and control (“Test-fit control unit and its testing procedures” / VB BRODIN, AV KALININ - Scientific session of MEPhI-2007. T. 1. Automation. Microelectronics. Electronics. Electronic measuring systems. Computer medical systems, pp. 94-96). The known method works as follows: when testing boards, input vectors (diagnostic tests) are introduced into the computational module through the instrumental serial port, based on which the computational module generates a packet via the instrument interface in the microcontroller of the input / output device, which actually sets the signals on the output lines of the block electronic device.

The disadvantage of this method is: insufficient monitoring of the operations performed, data exchange and status of input / output devices; the transition between diagnostic tests is associated with the reprogramming of the computing device via the instrumental serial port, the writing of diagnostic tests is carried out in a special development environment for programs for the computing module.

A known method of constructing a computational process for testing equipment (patent for the invention RU 2480807 C2, from 08.07.2011), adopted as a prototype, which consists in the fact that when testing electronic devices form diagnostic tests; performing tests, implement the computational process of testing and form data packets in the input / output device; an input / output device generates signals at the outputs; control equipment provides indication and control of the computing process. Unlike the previous method, in this method, the computing process implemented by the computing module is performed in the monitoring equipment, exchanging with the input / output device in transit through the computing module.

The disadvantages of the analogue and prototype is that for testing it is necessary to bring out the tested equipment from work.

The objective of the invention is to develop a method for periodic testing of a digital substation, which eliminates the disadvantages of analog and prototype.

The technical result of the invention is to conduct periodic testing without putting the tested equipment out of operation.

The specified technical result is achieved in that in the method of periodic testing of a digital substation, which consists in the fact that digital relay protection terminals periodically generate test sequences for monitoring the operability of each protection, which are included in this relay protection terminal, generate test signals in each test sequence that differ from the working signals by the presence of the sign "test", send test signals to digital measuring current transformers and voltage They send test signals to digital control systems for high-voltage circuit breakers, receive response test signals from digital measuring current and voltage transformers, receive test signals from digital control systems for high-voltage circuit breakers, while the relay protection terminal controls the content and time of receipt of response test signals in this test sequence, generates a fault signal when the content of the response test signals does not match the reference values for this test sequence, generates a fault signal when the response times of the test signals do not fall within the reference time intervals for this test sequence, according to the invention, the test signals sent to the digital current and voltage measuring transformers cause a test operation of the controlled protection, the digital current and voltage measuring transformers receive and send back the received test signals in parallel with the working signals, without stopping For continuous measurement of currents and voltages, received test signals, digital relay protection terminals process in parallel with the working input signals, generate test signals for digital control systems of high-voltage switches, which, when receiving test signals, generate response test signals for digital terminals in parallel with the working signals, while sending digital control systems for high-voltage off STUDIO test signals are identical except for the presence of the attribute "test" working signals both the content and the time delay relative to the received test signals, without performing any switching high voltage as a result of the test signals.

Thus, the technical result is achieved by testing the computational module of the equipment under test, performing testing with exchange with the input / output device in transit through the computational module, while the computational module of the tested equipment is finalized as follows: parallel to the main working working channel of information processing, the test a channel that either transits incoming test signals in transit, or in the test channel, the processing logic of the main channel is completely repeated Ala computing module.

The implementation of the method is illustrated by functional diagrams in FIG. 1, FIG. 2. In FIG. 1 shows a generalized structure of digital equipment:

- input signals 1,

- along with the main working channel 2 for passing information - you must add a test channel 3 for passing information, which completely (according to the logic of signal processing) repeats the main channel for passing information, but receives signals with the sign “test”,

- in the test channel - the sign “test” is added to the output signals, which is understood and correctly processed by other devices,

- both channels form the control output signals 4.

In FIG. Figure 2 shows the simplest example of a power grid with basic and test signals. There is a power supply 5, a high-voltage switch 6, a digital measuring current transformer 7, load 8.

The main signal transmission channel: the current in the line is controlled by a measuring transformer 7, the signal from which 9 goes to the relay protection terminal 10, when the current in the line exceeds the set current cutoff setting (for simplicity we consider the simplest current protection), signal 11 is sent to turn off the switch 6.

Information transmission test channel (dashed lines): the testing device 12 delivers a test signal 13 to the measuring transformer 7, while the parameters of the test signal (current amplitude in our example) are sufficient to trigger the tested protection (current cut-off in our example) of the relay protection terminal 10. The measuring transformer 7 simply transmits the test signal together with the main signal 9 to the relay protection terminal 10. The test signal 13 is processed by the relay protection terminal 10 according to the same logic as the main signal al (that is, the logic of the current cut-off). In the test channel 3 of the relay protection terminal 10, the current cutoff is triggered, and the relay protection terminal 10 outputs a test trip signal (along the line of the main channel 11) to the high-voltage switch 6. In this case, of course, when the test signals are received, the high-voltage switch 6 does not switch , it simply provides the test device 12 with a test signal 14 confirming receipt of the test signal for shutting down.

Thus, the testing device 12 outputs test signals 13 to the controlled system (5-8), receives test signals 14 of the system response from the system, and thus tests and monitors this system: the testing device 12 generates a fault signal when the content of the response test signals 14 does not match the reference the values for this test sequence 13, if the timing of receipt of the response test signals 14 does not fall in the reference time intervals for this test sequence 13.

In this case, the entire signal flow chain will be monitored.

- A test request 13 is sent to the measuring transformer 7 (from the testing device 12), containing the test signals that the measuring transformer 7 should send (checking the operation of the logic of the measuring transformer 7 - the transit of the test signals 13).

- The test signal 13 arrives (at terminal 10) from the measuring transformer 7, with a value sufficient to trigger the tested protections (checking the communication line 9 for measuring signals).

- There is a test operation of the protections, with the issuance of test signals for controlling the switches (checking the operation of the protection logic of the relay protection terminal 10).

- A test signal is applied to the high-voltage switch 6 (check of communication line 11 for control signals).

- Receipt of confirmation 14 from the high-voltage switch 6 about the successful completion of the test command (checking the operation of the logic of the high-voltage switch 6 - transit of the test signals).

In the energy sector, there is a transition to a maintenance system for electrical equipment in a state that requires continuous monitoring of the condition of the equipment.

- Reducing the cost of operating equipment (reducing maintenance, increasing the overhaul period, switching to a maintenance system for electrical equipment as it is) [CONCEPT FOR THE DEVELOPMENT OF RELAY PROTECTION AND AUTOMATION OF THE ELECTRIC NETWORK COMPLEX, JSC Russian Grids dated June 22, 2015 No. 356pr www.rosseti.ru/ investment / science / tech / ... ogenie.pdf].

Inside microprocessor-based relay protection and automation terminals, there is continuous self-monitoring, checking the functioning of individual units. In addition to the terminals, there are many other equipment in the protection and control circuit of the substation: current and voltage measuring transformers, high-voltage switches, communication lines.

With the transition to digital technology, with the advent of digital substations, each electric power device incorporates electronic devices, the computational module becomes digital: signal and control circuits work with digital signals, with fiber-optic communication lines. For such a digital substation, it is possible to expand continuous self-monitoring, checking the operation of individual units by the entire digital substation: by periodically polling the substation equipment with test queries proposed by the “Method of periodic testing of digital substation”.

The digital substation standard is described in the document “Communication networks and systems for automation systems in the electric power industry” IEC 61850. IEC 61850-9-2 (lightweight version of IEC 61850-9-2 LE) describes the mechanisms for receiving information from digital measuring transformers, the transmission of analog samples values over Ethernet (in the ISO / IEC 8802-3 Ethernet standard) - the so-called process bus. SV signals (Sampled Values - IEC 61850-9-2 standard) transmit digitized instantaneous values from digital measuring current and voltage transformers (CTs and VTs) to the process bus, where signals from many digital CTs and VTs are combined, transmitted directly in the form of a standardized Ethernet frame. At the same time, inside this Ethernet frame is already provided (in IEC 61850-9-2 standard) the “Reserved 1” field is reserved 2-byte field, the default value is 0x0000 (write two bytes in the number system with base 16). If the high byte of this field is set to 1 (that is, the value 0x0100 is transmitted), then digital CTs and VTs are in test mode. To transmit the test sign, you can also use the second field “Reserved 2” (reserved 2) - the reserved field for additional security parameters, the default value is 0x0000.

In other words, the international standard IEC 61850 already stipulates the operation mode of devices in test mode, a place for the sign “test” is provided in the signal format. The operation of the equipment in accordance with the proposed “Method for periodic testing of a digital substation” does not contradict the IEC 61850 digital substation standard.

Thus, the proposed “Method for periodic testing of a digital substation” allows you to periodically test the operability of digital substation equipment without stopping operation, without shutting down the equipment, while testing the computing module of the equipment under test (relay protection terminal), performing testing with exchange with the input / output device through computing module (measuring transformers, high-voltage switches).

Claims (1)

The method of periodic testing of a digital substation, which consists in the fact that digital relay protection terminals periodically generate test sequences for monitoring the operability of each protection that are included in this relay protection terminal, generate test signals in each test sequence that differ from operating signals by the presence of the sign “test” ", Send test signals to digital current and voltage transformers, send test signals to digital systems at by high-voltage circuit breakers, receive response test signals from digital measuring transformers of current and voltage, receive test signals from digital control systems of high-voltage circuit breakers, while the relay protection terminal controls the content and time of receipt of response test signals in this test sequence, generates a malfunction signal when the content does not match response test signals to the reference values for a given test sequence, generates a signal n if the test signals sent to the digital current and voltage transformers cause test operation of the controlled protection, the digital current and voltage transformers receive and send the received back test signals in parallel with the working signals, without stopping the continuous measurement of currents and voltages, received dough The digital relay protection terminals process the signals in parallel with the working input signals, and, based on the processing of the input test signals by the logic of controlled protection, generate test signals for digital control systems for high-voltage circuit breakers, which, when receiving test signals, generate response test signals for digital terminals in parallel with the working signals, In this case, the test signals sent by the digital high-voltage circuit-breaker control systems are identical, except for the sign “test”, the working signals both in content and in time delays relative to the received test signals, while doing not perform any high-voltage switching as a result of receiving test signals.

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