System for controlling residual health index for emergency operation control when transmission lines have failure simultaneously

Abstract

A system is provided that utilizes the remaining healthy phase when a simultaneous fault occurs in two lines of an ultra-high voltage transmission line. The system is characterized by a transmission line blocking unit that protects the transmission line, a transmission line protection relay unit that detects the failure of operation of the transmission line blocking unit, an emergency operation control panel that executes a selected circuit breaker closing mode when a circuit breaker closing mode is selected in the event of an emergency, and a circuit breaker closing unit that closes the circuit breakers of the transmission line blocking unit to form a temporary line using the remaining healthy phase according to the circuit breaker closing mode.

Description

Technology Field

[0001] The present invention relates to a technology for utilizing residual healthy phases, and more specifically, to a residual healthy phase control system that performs emergency operation control in the event of a simultaneous failure of two lines of an ultra-high voltage transmission line according to the circuit breaker closing mode. Background Technology

[0002] According to the 10th Basic Plan for Electricity Supply and Demand ('23.1.13), the projected composition of new and renewable energy sources is expected to continuously increase in rated capacity (effective capacity) from 32.8GW (6.1GW) in '23 to 108.3GW (14.5GW) in '36, accounting for approximately 45.5% of the total power composition of 239GW (rated capacity).

[0003] As such, while renewable energy sources continue to increase, the reinforcement of power facilities is being delayed, leading to growing uncertainty in the power grid. Furthermore, failures in overhead transmission lines caused by natural disasters, such as wildfires resulting from climate change, have been occurring frequently recently.

[0004] In particular, if simultaneous failures occur in two lines of ultra-high voltage transmission lines of approximately 345kV or higher, system stabilization devices are used to disconnect nearby generators from the system or cut off certain loads to resolve power system instability. If additional failures occur in power facilities at this time, there is a high possibility that a large-scale widespread power outage will occur due to the resulting ripple effect.

[0005] Over the past 15 years, approximately 450 wildfires occurred annually, and about 2.3 cases resulted in transmission line failures; however, in 2022, 620 wildfires occurred, of which 59 resulted in transmission line failures. This is the result of winter precipitation being very low at about 14.7% of the average, and large-scale wildfires occurring intensively in March and April, when dry weather conditions persisted.

[0006] According to global climate change projections, if the average global temperature rises by about 2°C, the area affected by wildfires is predicted to increase by up to about 35%, and wildfires are expected to become more frequent and larger.

[0007] To address these problems, management measures for power facilities are being established. One such measure involves changing the phase layout of the substation outgoing section when a simultaneous failure of two transmission lines occurs due to a wildfire, and when the failure location is mainly at the lowest phase and restoration is expected to take a long time due to the need for replacement caused by power line damage. Figure 1 illustrates this method.

[0008] Referring to Fig. 1, in the case of a method for changing the phase arrangement of the substation outgoing section, if damage occurs to the lower power line of #1, 2T / L (Transmission / Line) due to a wildfire, the power line of the lower arm of #2T / L is removed, the upper power line of #1T / L (Phase A) is moved, and the A phase of #1T / LS / T (Substation) is moved to the position of the #2T / LS / TA phase. In this case, it is necessary to review the insulation spacing between the substation outgoing phases.

[0009] Alternatively, there is a method of bypassing the wildfire section. A diagram illustrating this is shown in Fig. 2. Referring to Fig. 2, in the case of the wildfire section bypass configuration plan, if a section of power line damage occurs at the bottom of #1 and 2T / L due to a wildfire, the disconnection status of both #1 and 2T / L lines is checked, and bypass operations such as disconnecting jumper wires are prepared. The bypass operations are then carried out. That is, after connecting the wires at the bottom of #2T / L and the top of #1T / L, one line is energized.

[0010] Through these methods, a plan was established to supply power urgently after configuring a temporary single line in a sound manner.

[0011] However, the above measures are difficult to apply in places where the inter-phase insulation spacing is insufficient, and they are difficult to apply to ultra-high voltage transmission lines of about 345kV or higher with long inter-phase distances due to construction issues, so there is a disadvantage that additional measures and / or technologies are required to solve this.

[0012] To elaborate, the interruption of transmission line routes of approximately 345kV or higher results in power system instability and / or excessive constraint costs. In fact, when two lines—approximately 765kV Sintaebaek-Sinhanul (March 4) and approximately 765kV Sinseosan-Dangjin Thermal Power Plant (April 9)—failed simultaneously due to wildfires in 2022, power generation constraint costs amounted to approximately 81.8 billion won.

[0013] Therefore, if power lines are severely damaged due to disasters such as wildfires and restoration is expected to take a long time, measures must be taken to operate one line temporarily by mobilizing measures such as changing the phase layout of substation outgoing sections or rerouting the wildfire section in order to ensure the stable operation of the power system. For locations where such measures are impossible, emergency operational control is required. Prior art literature

[0014] 1. Republic of Korea Registered Patent No. 10-2166859 (Registration Date: October 12, 2020) The problem to be solved

[0015] The present invention is proposed to resolve the problems according to the background technology above, and aims to provide a system and method for utilizing the remaining healthy phase when a simultaneous failure occurs in two lines of an ultra-high voltage transmission line.

[0016] In addition, the present invention has another objective of providing a system and method capable of supplying power through a temporary single line by combining healthy phases, even in locations where a plan to change the phase arrangement of the substation outgoing section or a plan to configure a wildfire section bypass is impossible. means of solving the problem

[0017] To achieve the above-mentioned objectives, the present invention provides a system that utilizes the remaining healthy phase when a simultaneous fault occurs in two lines of an ultra-high voltage transmission line.

[0018] The above system is,

[0019] Transmission line blocking unit that protects the transmission line;

[0020] A transmission line protection relay that detects the operation failure of the above-mentioned transmission line interruption unit;

[0021] An emergency operation control panel that executes the selected circuit breaker closing mode when the circuit breaker closing mode is selected in the event of an emergency; and

[0022] The circuit breaker closing unit is characterized by closing the circuit breakers of the transmission line blocking unit to form a temporary circuit using the remaining healthy phase according to the circuit breaker closing mode.

[0023] At this time, the circuit breaker closing mode is characterized by being composed of a first circuit breaker closing mode (Mode1) and a second circuit breaker closing mode (Mode2).

[0024] In addition, the above-mentioned first circuit breaker closing mode 1 (Mode 1) is characterized by configuring temporary lines with the transmission line (T / L) A phase of the first line (#1) and the transmission line (T / L) B and C phases of the second line (#2), wherein the remaining healthy phases are the A and B phases of the first line (#1) and the B and C phases of the second line (#2), and the faulty phases are the C phase of the first line (#1) and the A phase of the second line (#2).

[0025] In addition, the above circuit breaker closing mode (Mode 2) is characterized by configuring temporary circuits with phases A and B of the transmission line (T / L) of the remaining healthy circuit (#1) and phase C of the transmission line (T / L) of the second circuit (#2).

[0026] In addition, the system is characterized by including a switching circuit that, in the event of a fault, simultaneously opens all phases switched on the 1st line (#1) transmission line (T / L) and the 2nd line (#2) transmission line (T / L).

[0027] In addition, the above batch opening is characterized by automatically turning off the switch after a certain period of time if phases A, B, and C are not simultaneously switched on after the input signal is generated and only two or one phase is switched on.

[0028] In addition, the above emergency operation control panel is characterized by including: a closing mode execution module that executes the circuit breaker closing mode; a trip operation module that generates a trip signal for the protection operation of the transmission line breaker; and a phase failure operation module that separates or releases the phase failure of the circuit breaker.

[0029] In addition, the above emergency operation control panel is characterized by including a status monitoring module that monitors the contact status of the transmission line breaker.

[0030] In addition, the above-described state monitoring module is characterized by receiving the three-phase contact status of line 1 and line 2 and determining whether the circuit breaker is in an open state or a closed state.

[0031] In addition, the above-mentioned emergency operation control panel is characterized by including a synchronization verification module that performs a synchronization check of the distribution panel to obtain synchronization conditions.

[0032] In addition, the emergency operation control panel is characterized by including a logic circuit that finally executes the selected circuit breaker closing mode by multiplying the selected circuit breaker closing mode and the synchronization condition.

[0033] In addition, the system is characterized by including a switch unit that adds an on / off by a user to the product of the selected circuit breaker closing mode and the synchronization condition for a final decision in the logic circuit.

[0034] In addition, the above synchronization check is characterized by checking whether there is synchronization between the B-phase voltage of a single-circuit busbar and the B-phase of a single-circuit or two-circuit transmission line (T / L).

[0035] In addition, for the above synchronization check, one phase voltage among the voltages of the 1st line (#1) transmission line and the 2nd line (#2) transmission line is received as input, and the voltage is distinguished as live when abnormal and dead when lower than that compared with a certain voltage, and the line voltage is distinguished as live and dead according to the user selection mode (43M Mode).

[0036] In addition, for closing the circuit breaker according to the above synchronization check, a condition signal is generated that allows the circuit breaker to be closed when the voltage magnitude and phase synchronization conditions are simultaneously satisfied with the abnormal busbar voltage (live), the abnormal busbar voltage (dead), the above line voltage (dead), and the above line voltage (live), which are inputs and distinguished by comparison with a certain voltage, and a certain amount of time has elapsed.

[0037] In addition, the above fixed time is characterized as being 200ms.

[0038] On the other hand, another embodiment of the present invention provides a method for controlling residual healthy phases during a simultaneous transmission line failure, characterized by comprising: (a) a step in which a transmission line protection relay detects an operation failure of a transmission line circuit breaker; (b) a step in which an emergency operation control panel executes a selected circuit breaker closing mode as the circuit breaker closing mode is selected when an emergency occurs; and (c) a step in which the circuit breaker closing unit closes the circuit breakers of the transmission line circuit breaker to form a temporary circuit using the residual healthy phase according to the circuit breaker closing mode.

[0039] At this time, the above step (b) is characterized by including: a step in which a closing mode execution module executes the circuit breaker closing mode; a step in which a trip operation module generates a trip signal for the protection operation of the transmission line breaker; and a step in which a phase failure operation module separates or releases the phase failure of the circuit breaker.

[0040] On the other hand, another embodiment of the present invention provides a computer-readable storage medium storing a program for executing on a computer the residual healthy phase control method in the event of a simultaneous failure of a transmission line described above. Effects of the invention

[0041] According to the present invention, when simultaneous failures occur in two lines of an ultra-high voltage transmission line, the remaining healthy phase can be utilized.

[0042] In addition, another advantage of the present invention is that power can be supplied through a temporary single line via a healthy phase combination using an emergency operation control panel, thereby preventing a wide-area power outage in the event of an additional power equipment failure.

[0043] In addition, another advantage of the present invention is that losses due to development constraint costs can also be minimized. Brief explanation of the drawing

[0044] Figure 1 is a conceptual diagram illustrating a general method for changing the phase layout of a substation outgoing section. Figure 2 is a conceptual diagram illustrating the implementation of a general wildfire section bypass configuration plan. FIG. 3 is a conceptual diagram for analyzing simultaneous faults in two lines of an ultra-high voltage transmission line according to an embodiment of the present invention. FIG. 4 is Example 1 showing the circuit breaker closing mode 1 in case of an emergency in FIG. 3. FIG. 5 is Example 2 showing the circuit breaker closing mode 2 in case of an emergency in FIG. 3. FIG. 6 is a configuration diagram of a residual healthy phase control system in the event of a simultaneous transmission line failure according to an embodiment of the present invention. Figure 7 is a diagram showing the detailed operation of the emergency operation control panel illustrated in Figure 6. Figure 8 is a diagram showing the operation of the switch unit illustrated in Figure 6. Figure 9 is a diagram showing the operation of the circuit breaker (CB) closing mode illustrated in Figure 6. FIG. 10 is a diagram showing the operation of creating a condition signal that can close a circuit breaker according to an embodiment of the present invention. FIG. 11 is a drawing showing a circuit breaker closing operation for final closing of a temporary single-line circuit breaker according to an embodiment of the present invention. FIG. 12 is a drawing showing the operation of opening circuit breakers in batches according to an embodiment of the present invention. FIG. 13 is a diagram showing a circuit capable of simultaneously blocking two lines according to an embodiment of the present invention. FIG. 14 is an example of a screen of a diagnostic program according to an embodiment of the present invention. Specific details for implementing the invention

[0045] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0046] When describing each drawing, similar reference numerals are used for similar components.

[0047] Terms such as first, second, etc., may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another.

[0048] For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0049] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains.

[0050] Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0051] A system and method for controlling remaining healthy phases in the event of a simultaneous failure of a transmission line according to an embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0053] FIG. 3 is a conceptual diagram for analyzing simultaneous faults in two circuits of an ultra-high voltage transmission line according to an embodiment of the present invention. Referring to FIG. 3, the transmission line (T / L) is mostly composed of two circuits (#1, #2) between substations, and as shown in the phase arrangement diagram, the first circuit (#1) is arranged in the order of ABC from the top, and the second circuit (#2) is arranged in the order of CBA. Generally, when analyzing the fault, in the case of #1 T / L, the fault tends to occur concentrated in the lowest phase, phase C, and in #2 T / L, the fault also tends to occur concentrated in the lowest phase and the middle phases, phases A and B. At this time, the remaining healthy phases are phases A and B of the first circuit (#1) and phase C of the second circuit (#2).

[0054] The remaining healthy phases can be formed by combining the two lines, the A and B phases of the 1st line (#1) transmission line (T / L) and the C phase of the 2nd line (#2) transmission line (T / L).

[0055] In order to configure a temporary single circuit without changing the substation outgoing line or bypassing the prepaid section, you can select and switch on the healthy phase of the circuit breaker for the transmission line at both substations, but there are three major preliminary measures that must be taken.

[0056] First, to prevent the occurrence of unbalanced current in the system, a circuit must be configured to simultaneously close combined healthy phase circuit breakers, and a circuit capable of synchronous closing at the receiving end by measuring the voltage magnitude and phase difference between the transmitting and receiving ends.

[0057] Second, in gas-insulated switchgear of 345kV or higher, if any one of the three phases is switched on or open, a relay is configured in the circuit to monitor the phase failure state (preventing the occurrence of unbalanced current) and to open the switched phase if the phase failure state is maintained for a certain period of time (100ms). At this time, since the temporary single-circuit configuration method is a phase failure state where only one or two phases are switched on in both #1 and #2 T / L, the circuit must be isolated so that the phase failure relay cannot operate.

[0058] Third, the transmission line protection relay protects #1 and #2 T / L separately. If a fault occurs only in #1 T / L during temporary single-line operation, only the #1 T / L circuit breaker is opened, causing an unbalanced current to be generated in the system due to the phase remaining in #2 T / L. Therefore, a circuit must be configured to open #1 and #2 T / L simultaneously.

[0059] The preliminary measures for utilizing transmission line preference soundness are summarized as follows.

[0060] 1) [Control] Configuration of Batch and Synchronous Closing of Healthy Phase Circuit Breakers by Condition

[0061] ① Considering fault conditions, simultaneously power on healthy lines 1 and 2 (#1, #2).

[0062] (System imbalance current occurs when each phase is individually switched on)

[0063] ② After switching on the pressurizing terminal, check the synchronization conditions of the receiving terminal circuit breakers and switch them all at once.

[0064] (Fault occurs during manual switching due to phase difference between the two substations)

[0065] 2) [GIS (Gas-insulated Switchgear)] Circuit breaker phase loss trip circuit isolation

[0066] ① When switching on healthy phases, only 1 or 2 phases per circuit are switched on => Wiring status

[0067] (Three-phase open due to operation of relay (in GIS) activated during phase loss)

[0068] 3) [Protection] Configuration for simultaneous opening of circuit breakers in the event of a transmission line fault during emergency operation

[0069] ① Configuration of a simultaneous two-line open circuit in the event of a fault on an energized healthy phase

[0070] (System unbalanced current occurs when only one line is open)

[0071] FIG. 4 is an embodiment 1 showing the circuit breaker closing mode 1 (Mode 1) in case of an emergency in FIG. 3. Referring to FIG. 4, the circuit breaker closing mode 1 (Mode 1) in case of an emergency configures a temporary circuit (i.e., 1-circuit operation) using the remaining healthy phases: phase A of the transmission line (T / L) of circuit 1 (#1), and phases B and C of the transmission line (T / L) of circuit 2 (#2). That is, the remaining healthy phases are phases A and B of #1, and phases B and C of #2, and the faulty phases are phase C of #2 and phase A of #2, and the temporary circuit operation is phase A of #1, and phases B and C of #2.

[0072] FIG. 5 is an embodiment 2 showing the circuit breaker closing mode 2 (Mode 2) in case of an emergency in FIG. 3. Referring to FIG. 5, the circuit breaker closing mode 2 (Mode 2) in case of an emergency configures a temporary circuit using the remaining healthy phases, namely phases A and B of the transmission line (T / L) of circuit 1 (#1) and phase C of the transmission line (T / L) of circuit 2 (#2). That is, the remaining healthy phases are phases A and B of #1 and phases B and C of #2, the faulty phases are phase C of #2 and phase A of #2, and the temporary circuit operation is phases A and B of #1 and phase C of #2.

[0073] The receiving end is asynchronous, and the boosting end is switched on after verifying the synchronous condition. At this time, the synchronous check is performed between the B-phase voltage of the single-circuit busbar and the B-phase of the single-circuit or double-circuit transmission line (T / L).

[0074] FIG. 6 is a configuration diagram of a residual healthy phase control system (600) in the event of a simultaneous failure of a transmission line according to an embodiment of the present invention. In particular, FIG. 6 is based on a receiving end substation. Referring to FIG. 6, the residual healthy phase control system (600) may be configured to include an emergency operation control panel (610), a circuit breaker unit (620) that protects the transmission line, a distribution panel (630) that supplies phase voltage, a closing mode operation unit (641) that selects a circuit breaker closing mode, a transmission line protection relay unit (650), a switch unit (660) that turns on and off, a closing circuit unit (671) that controls the closing of a circuit breaker within a Gas-insulated Switch Gear (GIS), a circuit breaker closing unit (672) that controls the closing of a circuit breaker within a GIS, a first protection panel (680) that executes a trip, and a second protection panel (690) that creates or releases a phase loss circuit using a circuit breaker.

[0075] The SCADA server (602) performs the function of monitoring, controlling, and alarming related facilities. That is, it monitors the status of circuit breakers, uses active / reactive power meters, and configures them by combining existing measurement values. SCADA is a system for centrally monitoring or controlling power facilities located at a distance. By simplifying and automating diverse and complex power facilities, and by effectively monitoring, controlling, measuring, and analyzing these facilities and systems in one place, it enables rational operation of facilities and systems and efficient energy management.

[0076] Power facilities are devices installed for power generation, transmission, transformation, distribution, power supply, or use of electricity, and may include generators, substations, transformers, switches, current transformers, circuit breakers, etc.

[0077] The emergency operation control panel (610) may be configured to include a state monitoring module (611) for monitoring the contact status of a transmission line blocking module (620), a synchronization verification module (612) for synchronizing a distribution panel (630), a closing mode execution module (613) for executing a circuit breaker closing mode, a trip operation module (615) for generating a trip signal for protection operation, and a phase separation release module (617) for separating or releasing the phase of the circuit breaker.

[0078] The status monitoring module (611) performs the function of monitoring the contact status of the transmission line blocking unit (620). The transmission line blocking unit (620) may be composed of multiple circuit breakers (8571CB, 8671CB). That is, it monitors whether the A, B, and C phases of the circuit breakers (8571CB, 8671CB) are 'a' contacts. An 'a' contact refers to an open state. That is, normally it is in an open state where it is not connected, but when operated, it becomes a closed state.

[0079] The insertion mode execution module (613) performs the function of executing the insertion mode selected by the insertion mode operation unit (641). To elaborate, the insertion mode operation unit (641) performs the function of selecting the circuit breaker insertion mode (642) through the SCADA server (602). This insertion mode operation unit (641) may be executed by a button menu on the screen of the SCADA server (602), or it may be executed using a program such as an app through a communication terminal (not shown) connected to the SCADA server (602) via communication.

[0080] In Fig. 6, it is illustrated separately for ease of understanding. The communication terminal can be a PC (Personal Computer), mobile phone, smartphone, laptop computer, digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), navigation, notepad, etc.

[0081] The circuit breaker closing mode consists of a first circuit breaker closing mode (Mode 1) and a second circuit breaker closing mode (Mode 2). The first circuit breaker closing mode 1 (Mode 1) configures a temporary circuit with phase A of the transmission line (T / L) of circuit 1 (#1), which is the remaining healthy phase, and phases B and C of the transmission line (T / L) of circuit 2 (#2).

[0082] Of course, the insertion mode execution module (613) executes the insertion mode after checking the synchronization condition at the pressurizing unit. That is, the logic circuit (614) can be configured so that the insertion mode execution and the synchronization condition are logically multiplied. The logic circuit (614) can be composed of multiple logical ANDs (614-1, 614-2) for each circuit breaker insertion. Of course, a switch unit (660) can be configured so that the user can selectively turn the insertion mode execution on or off.

[0083] To elaborate, the user can turn on or off the execution of the insertion mode function using the switch unit (660). In this case, the logic circuit (614) can make the selected insertion mode execute only when the insertion mode execution, the synchronization condition, and the switch on are logically multiplied.

[0084] As the closing mode is executed, the circuit breaker closing unit (672) controls the closing of the circuit breaker within the GIS. That is, it controls the transmission line blocking unit (620). Through this, a temporary circuit can be created. Of course, the user can control the transmission line blocking unit (620) through the switch unit (660), and for this purpose, a closing circuit unit (671) that controls the closing of the circuit breaker within the GIS (Gas-insulated Switch Gear) is configured. In this case, the three phases are separated collectively.

[0085] Referring to FIG. 6, the trip operation module (615) performs the function of generating a trip signal for the protection operation of the transmission line blocking unit (620). That is, it turns off the blocking unit. Of course, additionally, a logical AND (615-1) can be configured to allow the user to decide whether or not to trip.

[0086] Accordingly, the trip operation module (615) generates a trip signal when a circuit breaker operation failure signal is detected from the protection relay unit (650). The trip operation module (615) generates a trip signal when a circuit breaker operation failure signal is detected at a relay on a single transmission line or a relay on a two-line transmission line.

[0087] The first protection unit (680) trips the corresponding circuit breaker when the trip function is turned on by logical AND (615-1).

[0088] The phase disconnection release unit (617) receives the circuit breaker phase disconnection or release command (601) and disconnects or releases the phase disconnection circuit unit (690). Of course, a logical AND (617-1) can be configured so that the user's selection can be a condition. The circuit breaker phase disconnection or release command (601) may be transmitted from the SCADA server (602) or through a communication terminal connected to the SCADA server (602).

[0089] To elaborate, in the case of a phase failure circuit, the circuit breaker consists of a total of three phases, A, B, and C. If power is supplied while even one of these phases is closed or open, problems may occur in the power system. Therefore, it refers to a circuit that combines control cables and various auxiliary relays within the circuit breaker panel to automatically open all phases if any of the A, B, or C phases are closed or open.

[0090] In addition, disconnecting the phase failure circuit means preventing the phase failure circuit from operating, and releasing the phase failure circuit means allowing the phase failure circuit to operate normally.

[0091] Through this emergency operation control panel (610), the circuit breaker phase failure trip circuit can be isolated. That is, during emergency operation, only one or two phases per circuit are connected to create a phase failure state (i.e., a temporary circuit). In addition, the operation circuit of the phase failure relay (installed in the GIS) of the transmission line protection relay unit (650) that operates when the phase failure state is isolated.

[0092] Generally, various auxiliary relays (phase failure relays, phase failure timers, etc.) and control cables are required to configure a phase failure circuit. Operational circuit isolation refers to physically operating or not operating (opening or closing the circuit) these circuits. The emergency operation control panel is the additional facility configured to physically isolate circuits in this way.

[0093] In addition, the circuit breakers can be opened collectively when a fault occurs in the transmission line. That is, the transmission line protection can use the existing protection relay (current differential) of the transmission line protection relay unit (650). In addition, when a fault occurs in the transmission line (T / L) of the first line (#1) or the transmission line of the second line (#2), it can be configured so that all phases connected to the transmission line (T / L) of the first line and the second line (#1, #2) are opened collectively. That is, all phases connected to the transmission line (T / L) of the first line and the second line (#1, #2) can be opened using the connection circuit unit (671).

[0094] FIG. 7 is a diagram showing the detailed operation of the emergency operation control panel illustrated in FIG. 6. Referring to FIG. 7, the #1 and #2 transmission line circuit breaker closing state contacts (711, 712) are received at the site (710), and conditions [#1 A phase or #2 A phase], [#1 B phase or #2 B phase], and [#1 C phase or #2 C phase] are configured. If all three conditions are satisfied (720), it is determined that the circuit breaker is in a 3-phase closing state (732) where phases A, B, and C are all closed, and if none of them are satisfied, it is determined that the circuit breaker is in a 3-phase open state (731) where phases A, B, and C are all open (730). Of course, for this operation logic, a logical OR (721) and a logical AND (722) are configured.

[0095] FIG. 8 is a diagram showing the operation of the switch unit (660) illustrated in FIG. 6. Referring to FIG. 8, switches such as 43S (tentative name), 43M (tentative name), and 43T (tentative name) are installed outside the emergency operation control panel (610) to receive status contacts when ON / OFF, Mode 1 / Mode 2, and TYPE 1 / TYPE 2 are set, and can be used to configure the operation logic. The 43S switch (810) has the final decision for all operation actions of the control panel (610) and can open the circuit breakers collectively when OFF (801, 802) in the temporary circuit operation state. The 43M switch (820) selects 3 phases out of the 6 phases of the #1 and #2 transmission line circuit breakers, and the 43T (830) selects the #1 or #2 transmission line arrangement as ABC or CBA. A NOR gate (811) and a logical AND (812) may be configured for the logic.

[0096] FIG. 9 is a diagram showing the operation of the circuit breaker (CB) closing mode illustrated in FIG. 6. Referring to FIG. 9, after closing the pressurizing end circuit breaker, the voltage of transmission lines #1 and #2 (one phase among phases A, B, and C) is received at the site to synchronously close the receiving end circuit breaker. The line voltage status is monitored (live) when the voltage is above a certain level and (dead) when it is below (910), and the line voltage is live and the line voltage is dead according to the user selection mode (43M Mode). second It enables differentiation (920, 930). Of course, for logic, logical AND (921) and logical OR (922) are configured.

[0097] FIG. 10 is a diagram showing the operation of creating a condition signal that enables closing a circuit breaker according to an embodiment of the present invention. Referring to FIG. 10, for synchronous closing of the circuit breaker, the bus voltage phases A, B, and C of the corresponding substation are received as input, and the bus voltage is monitored as live when the voltage is above a certain level and dead when the voltage is below that level. A condition signal that enables closing the circuit breaker is created (1030) when the bus voltage is dead (satisfying both the bus voltage live and line voltage dead conditions), [(bus voltage live and line voltage dead) and line voltage live and voltage magnitude and phase synchronization conditions are simultaneously satisfied (1010) and maintained for approximately 200ms (changeable) or more} (1020). Of course, for logic, a logical AND (1021), a logical OR (1022), a timer, etc. are configured.

[0098] FIG. 11 is a diagram showing the circuit breaker closing operation for the final closing of a temporary single-line circuit breaker according to an embodiment of the present invention. Referring to FIG. 11, for the final closing of the temporary circuit breaker, switches 43T and 43M are set, and when a closing signal is generated from the control panel or remotely (1110) while the circuit breaker closing condition is satisfied, the circuit breaker can be finally closed (1120, 1130). However, all operations are possible only when the 43S switch is ON. Of course, a chip (1123) is configured to perform logical OR (1121), logical AND (1122), set, or clear (clr) for logic.

[0099] FIG. 12 is a diagram showing the operation of opening circuit breakers in batches according to an embodiment of the present invention. Referring to FIG. 12, if phases A, B, and C are not opened simultaneously after an input signal is generated and only two or one phase is opened, the case is monitored (1210), and after a certain period of time, 43S is automatically turned OFF (1220) to open the circuit breakers in batches (1230). Of course, logical AND (1222), logical OR (1223), timers, etc. may be configured.

[0100] FIG. 13 is a diagram showing a circuit capable of simultaneously blocking two lines according to an embodiment of the present invention. Referring to FIG. 13, in order to simultaneously block transmission lines #1 and #2 in a temporary single-line operation state, a protection relay operation signal is received from each transmission line protection relay (1310), and a circuit is configured to simultaneously block two lines even if only one of the two signals is received (1320) (1330).

[0101] FIG. 14 is an example of a screen of a diagnostic program according to an embodiment of the present invention. Referring to FIG. 14, the operation of the SPS (special protection system) is reflected after a fault in the Sintaebaek-Singapyeong #1,2 T / L. That is, the Sinhanul 1G and Hanul 5G are shut off, the Sh.R (shunt reactor) at both ends is shut off, and the shortfall in power generation is covered by turning on the metropolitan area generator (Yeongheung 1,2,4G). In addition, the 2 phases closed and 1 phase closed functions of the SCMU were utilized, and the R and X values ​​were entered using the existing Singapyeong-Sintaebaek T / L line constants.

[0102] The results are as follows.

[0103] - When 1 phase is closed (2 Phases closed)

[0104]

[0105] - When 2-line phase is closed (1 phase closed)

[0106]

[0107] The trip time based on the reverse phase imbalance rate is calculated as follows.

[0108] - Trip time at 15% imbalance rate: 222 seconds

[0109] - Trip time at 10% imbalance rate: 500 seconds

[0110] The trip time is calculated using the following mathematical formula.

[0111]

[0112] Here, K is the negative-sequence capability constant, and I nom is the rated current.

[0113] Additionally, the steps of the method or algorithm described in connection with the embodiments disclosed herein may be implemented in the form of program instructions that can be executed through various computer means, such as a microprocessor, a processor, a CPU (Central Processing Unit), etc., and recorded on a computer-readable medium. The computer-readable medium may include program (instruction) code, data files, data structures, etc., either alone or in combination.

[0114] The program (instruction) code recorded on the above medium may be those specifically designed and configured for the present invention, or those known and available to those skilled in the art of computer software. Examples of computer-readable recording media may include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs, DVDs, and Blu-rays; and semiconductor memory devices specifically configured to store and execute program (instruction) code, such as ROM (Read Only Memory), RAM (Random Access Memory), and flash memory.

[0115] Here, examples of program (instruction) code include not only machine code, such as that generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter, etc. The aforementioned hardware device may be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa. Explanation of the symbols

[0116] 600: Health control system 610: Emergency Operations Control Panel 611: Status Monitoring Module 613: Insertion Mode Execution Module 615: Trip Operation Module 617: Phase Loss Operation Module 620: Transmission preferred breaker 650: Transmission line protection relay

Claims

Claim 1 A transmission line blocking unit (620) that protects the transmission line; a transmission line protection relay unit (650) that detects the failure of operation of the transmission line blocking unit (620); and an emergency operation control panel (610) that executes the selected circuit breaker closing mode as the circuit breaker closing mode (642) is selected by the closing mode operating unit (641) when an emergency occurs. and includes a circuit breaker closing unit (672) that closes the circuit breakers of the transmission line blocking unit (620) to form a temporary circuit using the remaining healthy phase according to the circuit breaker closing mode; and the emergency operation control panel (610) includes a state monitoring module (611) that monitors the contact status of the transmission line blocking unit (620), a synchronization verification module (612) for synchronization of the distribution panel (630), a closing mode execution module (613) that executes the circuit breaker closing mode, a trip operation module (615) that generates a trip signal for the protection operation of the transmission line blocking unit (620), and a phase failure operation module (617) that separates or releases the phase failure of the circuit breaker; and the trip operation module (615) generates a trip signal in which a circuit breaker operation failure signal is detected at a relay on a single transmission line or a relay on a two-line transmission line, and the phase failure operation module (617) receives a command (601) to separate or release the circuit breaker phase failure circuit A residual healthy phase control system for emergency operation control in the event of a simultaneous transmission line failure, characterized by comprising: a switching circuit unit (671) that disconnects or releases the phase loss circuit unit (690) upon reception and, in the event of a fault, simultaneously opens all phases switched on the 1st line (#1) transmission line (T / L) and the 2nd line (#2) transmission line (T / L); and a state monitoring module (611) that monitors the contact status of the transmission line disconnection unit (620) in the emergency operation control panel (610).

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