KR102617698B1 - Gas Insulated Switchgear with embedded rechargeable DC power supply - Google Patents

Abstract

This relates to a local control panel of a gas insulated switchgear with a built-in rechargeable direct current supply device and a gas insulated switchgear including the local control panel. Direct current power is supplied to the monitoring and control circuit of the gas insulated switchgear through the direct current supply line of the substation. During supply, the A contact point of the relay is turned on and the B contact point is turned off, so that the battery is charged by the DC power supplied through the DC supply line. While the supply of DC power to the monitoring and control circuit through the DC supply line of the substation is stopped, the battery is charged. The A contact point of the relay is turned off and the B contact point is turned on at the same time, so that the DC power discharged from the battery is supplied to the supervisory control circuit, which cannot be solved by UPS, such as converter failure or disconnection of the DC supply line between the converter and the gas insulated switchgear. Even when a problem occurs with the supply of direct current power, it is possible to supply direct current power to the gas insulated switchgear.

Description

{Gas Insulated Switchgear with embedded rechargeable DC power supply}

It relates to a local control panel of a gas-insulated switchgear with a built-in rechargeable direct current supply device and a gas-insulated switchgear including the local control panel.

A substation is a facility that changes the voltage in the process of sending power produced by a power plant to users through transmission and distribution lines. It is equipped with various power facilities such as main transformers, on-site transformers, and gas insulated switchgear. Substation facilities can be divided into AC facilities that consume AC power and DC facilities that consume DC power. Recently, most substations have a UPS (Uninterruptible Power Supply) installed. The UPS converts the DC power charged in the battery into AC power and supplies AC power when a problem occurs in the AC power supply within the substation, such as a power outage. It plays a role.

The UPS is a facility that prepares in case a problem occurs in the supply of AC power within the substation. DC power is supplied to the DC equipment within the substation by a main transformer or a converter that converts AC power supplied from the UPS into DC power. In case of converter failure or disconnection of the DC supply line connected to the converter output, it cannot be resolved by supplying AC power from the UPS. Gas insulated switchgear is a device that protects power equipment and power systems within a substation by quickly blocking overcurrent, and the operation of circuit breakers, etc. within it is controlled using direct current power. Accordingly, if a problem occurs in the supply of direct current power within the substation, control of the gas insulated switchgear becomes impossible, resulting in serious damage such as damage to the power equipment and power system within the substation and fire.

A rechargeable type that enables supply of direct current power to the gas insulated switchgear even when problems with supplying direct current power that cannot be solved by UPS (Uninterruptible Power Supply), such as converter failure or disconnection of the direct current supply line between the converter and the gas insulated switchgear, occur. The object is to provide a local control panel of a gas insulated switchgear with a built-in direct current supply device and a gas insulated switchgear including the local control panel. It is not limited to the technical challenges described above, and other technical challenges may be derived from the description below.

The local control panel of the gas insulated switchgear with a built-in rechargeable direct current supply device according to one aspect of the present invention is a monitoring control circuit that is driven by direct current power supplied through the direct current supply line of the substation to monitor and control the gas insulated switchgear. ; a relay having contact points A and B that are turned on or off in opposite directions depending on whether direct current power is supplied to the monitoring and control circuit through the direct current supply line; And a battery whose positive terminal is connected to the A and B contacts of the relay and whose negative terminal is connected to the negative line of the direct current supply line.

While direct current power is supplied to the monitoring and control circuit through the direct current supply line, the contact point A is turned on and the contact point B is turned off, so that the battery is charged by the direct current power supplied through the direct current supply line, and the contact point B is turned on. While the supply of direct current power to the supervisory control circuit through the supply line is interrupted, the contact point A is turned off and the contact point B is turned on, so that the direct current power discharged from the battery is supplied to the supervisory control circuit.

One end of the A contact point is connected to the positive line of the DC supply line and the other end is connected to the positive terminal of the battery, and while DC power is supplied to the supervisory control circuit through the DC supply line, the A contact point is turned on. The positive terminal of the battery is connected to the positive line of the direct current supply line through the A contact point, so that the battery can be charged by direct current power supplied through the direct current supply line.

While the supply of direct current power to the monitoring and control circuit through the direct current supply line is interrupted, the contact point A is turned off, thereby disconnecting the positive line of the direct current supply line through the contact point A and the positive terminal of the battery. The monitoring and control circuit can be electrically separated from the direct current supply line.

The local control panel may further include a circuit breaker that is inserted between the positive line of the DC supply line and the other end of the A contact point and is opened when the magnitude of the current flowing into the battery from the DC supply line exceeds the reference current value. there is.

One end of the B contact point is connected to the positive terminal of the supervisory control circuit and the other end is connected to the positive terminal of the battery, and the B contact point is turned off while DC power is supplied to the supervisory control circuit through the DC supply line. The connection between the positive terminal of the battery and the positive terminal of the supervisory control circuit through the B contact point is broken, so that discharge from the battery to the supervisory control circuit can be blocked.

While the supply of direct current power to the supervisory control circuit through the direct current supply line is interrupted, the B contact point is turned on, so that the positive terminal of the battery is connected to the positive terminal of the supervisory control circuit through the B contact point, thereby discharging the battery. Direct current power may be supplied to the supervisory control circuit.

The local control panel may further include a circuit breaker that is inserted between one end of the B contact point and the positive terminal of the supervisory control circuit and is opened when the amount of current flowing from the battery into the supervisory control circuit exceeds a reference current value. there is.

The local control panel is inserted between the anode line of the DC supply line and the anode terminal of the monitoring control circuit and has a circuit breaker that opens when the magnitude of the current flowing into the monitoring control circuit from the DC supply line exceeds the reference current value. More may be included.

A gas insulated switchgear according to another aspect of the present invention includes a main body that receives power reduced by a main transformer of a substation or supplies the received power to a distribution line of a power system; and a local control panel that monitors the status of the main body and controls the operation of the main body.

While DC power is supplied to the monitoring and control circuit of the gas insulated switchgear through the DC supply line of the substation, the A contact point of the relay is turned on and the B contact point is turned off, so that the battery is charged by the DC power supplied through the DC supply line, While the supply of DC power to the monitoring and control circuit through the DC supply line of the substation is interrupted, the A contact point of the relay is turned off and the B contact point is turned on, causing the DC power discharged from the battery to be supplied to the monitoring and control circuit, causing converter failure and converter failure. Even when a DC power supply problem that cannot be solved by UPS occurs, such as a disconnection of the DC supply line between the gas insulated switchgear and the gas insulated switchgear, it is possible to supply direct current power to the gas insulated switchgear.

As a result, it is possible to control the gas-insulated switchgear even in the event of a DC power supply problem that cannot be solved by the UPS, such as a converter failure or disconnection of the DC supply line between the converter and the gas-insulated switchgear. It can prevent various accidents caused by loss of control, preventing damage to property and casualties. In addition, when inspecting and repairing the wiring network within a substation, inspection and repair are possible without loss of direct current power to the gas insulated switchgear. In particular, as the charging and discharging of the battery is controlled using only relays rather than a software control method using a microprocessor, highly reliable direct current power supply that is not affected by software virus infection, etc. is possible.

Figure 1 is a configuration diagram of a GIS substation to which an embodiment of the present invention is applied.
FIG. 2 is an exemplary diagram of the actual structure of the gas insulated switchgear 2 shown in FIG. 1.
Figure 3 is an example of a failure in the direct current supply line of the GIS substation shown in Figure 1.
FIG. 4 is a configuration diagram of the monitoring and control module 200 of the local control panel shown in FIG. 2.
FIG. 5 is a diagram showing the supply path of DC power when DC power is supplied to the monitoring and control circuit 201 shown in FIG. 4.
FIG. 6 is a diagram showing the path of DC power when the supply of DC power to the monitoring and control circuit 201 shown in FIG. 4 is stopped.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. Embodiments of the present invention provide direct current power to the gas insulated switchgear even when problems with the supply of direct current power that cannot be solved by a UPS (Uninterruptible Power Supply), such as converter failure or disconnection of the direct current supply line between the converter and the gas insulated switchgear, occur. It relates to a local control panel of a gas-insulated switchgear equipped with a rechargeable direct current supply device that enables supply, and a gas-insulated switchgear including the local control panel. Hereinafter, this gas insulated switchgear may be simply referred to as “GIS.”

Figure 1 is a configuration diagram of a GIS substation to which an embodiment of the present invention is applied. The GIS substation shown in Figure 1 refers to a substation where GIS is installed according to an embodiment of the present invention, and transforms AC power flowing in from the upper power system, for example, converting 170kV AC power into 25.8kV AC power. , power is distributed through a plurality of distribution lines 10 in the lower power system of the GIS substation. The GIS substation shown in Figure 1 includes a main transformer (MTR) (1), a gas insulated switchgear (GIS) (2), a substation transformer (STR) (3), and an uninterruptible UPS (UPS). It consists of Power Supply (4), converter (5), and AC equipment (6). Among the power supply lines shown in Figure 1, the thick solid lines represent alternating current supply lines, and the thin solid lines represent direct current supply lines. The GIS substation shown in FIG. 1 may further include other components in addition to the components described above.

The main transformer 1 reduces the voltage of AC power flowing in from the upper power system of the GIS substation shown in FIG. 1. The main transformer 1 of this embodiment reduces 170 kV power to 25.8 kV power. As shown in FIG. 1, the main transformer 1 is generally installed outdoors due to heat and noise generation, and other components such as the gas insulated switchgear 2 are installed indoors. The gas insulated switchgear (2) is a switchgear filled with SF ₆ gas as an insulating material and serves to open and close the AC power supply from the main transformer (1) to the plurality of distribution lines (10) and the on-site transformer (3). The on-site transformer (3) transforms the AC power supplied from the main transformer (1) through the gas insulated switchgear (2) and supplies it to the UPS (4), converter (5), and AC equipment (6).

The UPS (4) converts the alternating current power supplied from the on-site transformer (3) into direct current power and charges the battery inside it. In the event of an emergency such as a power outage, the UPS (4) converts the direct current power charged in the battery into alternating current power and transmits it from the substation as shown in FIG. 1. It serves to supply power to the power system and converter (5). The converter (5) converts AC power supplied from the on-site transformer (3) or UPS (4) into DC power and supplies it to a plurality of local control panels (LCP) of the gas insulated switchgear (2), thereby controlling each local It plays a role in allowing the control panel to operate. The AC equipment 6 is equipment that uses AC power within the substation shown in FIG. 1, and examples include ventilation equipment and firefighting equipment of the substation.

The gas insulated switchgear (2) is located in the busbar section (20), main bay (21), first feeder bay (22), second feeder bay (23), and Taipei (Tie Bay) ( 24), and Section Bay (25). Each bay, including the main bay (21), the first feeder bay (22), the third feeder bay (23), the taipei bay (24), and the section bay (25), consists of a main body and a local control panel. A bundle of the main bay (21), the first feeder bay (22), and the second feeder bay (23) is called a bank, and the gas insulated switchgear (2) has several banks connected in sequence, and several banks. It consists of a structure in which a taipei (24) and a section bay (25) are inserted between the banks.

The bus unit 20 is a common power line installed in each of the main bay 21, the first feeder bay 22, the third feeder bay 23, the Taipei 24, and the section bay 25, and is connected to the main bay 21. ), serves to transmit alternating current power between the first feeder bay (22), the third feeder bay (23), Taipei (24), and section bay (25). The bus bar unit 20 of this embodiment consists of double bus bars (#1 Bus, #2 Bus).

The main body of the main bay (21) receives AC power reduced to 25.8kV by the main transformer (1) and serves to supply AC power to the busbar unit (20), and is connected to the main transformer (1) to supply AC power to the main transformer (1). (1) A circuit breaker (CB, Circuit Breaker) to protect the power equipment supplied with power from the busbar unit 20 by blocking overcurrent from the busbar unit 20, and a double busbar of the busbar unit 20 for maintenance and inspection of the substation, etc. It consists of two disconnectors (DS, Disconnecting Switch) connected to and an earthing switch (ES, Earthing Switch) to maintain the grounding state of the gas insulated switchgear (2). The local control panel of the main bay 21 monitors the status of the main body of the main bay 21 and controls the operation of the main body.

The main body of the first feeder bay (22) receives AC power from the bus unit (20) and supplies AC power to the on-site transformer (3), and the bus unit (20) is used for maintenance and inspection of the substation. Two disconnectors (DS) connected to a double busbar, a circuit breaker (DS) connected to the busbar unit 20 through the two disconnectors (DS) to protect the on-site transformer (3) by blocking overcurrent from the busbar unit (20). CB), and an earthing switch (ES) to maintain the grounding state of the gas insulated switchgear (2). The local control panel of the first feeder bay 22 monitors the status of the main body of the first feeder bay 22 and controls the operation of the main body.

The main body of the second feeder bay 23 serves to receive AC power from the busbar unit 20 and supply AC power to the distribution line 10, and is connected to the busbar unit 20 for maintenance and inspection of the substation. Two disconnectors (DS) connected to a double busbar, a circuit breaker (DS) connected to the busbar unit 20 through the two disconnectors (DS) to protect the distribution line 10 by blocking overcurrent from the busbar unit 20. CB), and an earthing switch (ES) to maintain the grounding state of the gas insulated switchgear (2). The local control panel of the second feeder bay 23 monitors the status of the main body of the second feeder bay 23 and controls the operation of the main body.

The main body of Taipei (24) performs the role of switching one of the dual busbars of the busbar unit (20) that is currently being used for power transmission to another busbar when necessary, such as substation inspection, and maintenance and inspection of the substation. For this purpose, two disconnectors (DS) are connected to the double busbars of the busbar section 20, and are connected between the double busbars of the busbar section 20 through the two disconnectors (DS) to prevent overcurrent from one busbar to the other busbar. It consists of a circuit breaker (CB) to protect the power equipment supplied with power from the busbar unit 20 by blocking the circuit breaker (CB), and an earthing switch (ES) to maintain the grounding state of the gas insulated switchgear (2). The local control panel of Taipei 24 monitors the status of the main body of Taipei 24 and controls the operation of the main body.

The main body of the section bay (25) serves to separate or connect a plurality of banks made up of a main bay (21), a first feeder bay (22), and a second feeder bay (23), and connects neighboring banks to each other. Two pairs of disconnectors (DS) installed at both ends of a double busbar connected between banks, a circuit breaker (CB) placed between each pair of disconnectors (DS) to block overcurrent between each pair of disconnectors (DS), and gas. It consists of an earthing switch (ES) to maintain the grounding state of the insulating switchgear (2). The local control panel of the section bay 25 monitors the status of the main body of the section bay 25 and controls the operation of the main body.

FIG. 2 is an exemplary diagram of the actual structure of the gas insulated switchgear 2 shown in FIG. 1. Figure 1 shows a circuit diagram of the single-phase gas insulated switchgear 2 in order to reduce drawing complexity, and Figure 2 shows a three-phase separated gas insulated switchgear according to the circuit diagram of the gas insulated switchgear 2 shown in Figure 1 ( An example of the actual structure of 2) is shown. In FIG. 1, in order to reduce drawing complexity, the gas manometer (GM), potential transformer (PT), and current transformer (CT) shown in FIG. 2 are omitted. As described above, each bay, including the main bay 21, the first feeder bay 22, the third feeder bay 23, the taipei bay 24, and the section bay 25, consists of a main body and a local control panel.

The bus bar unit 20 is a part corresponding to “#1 Bus” and “#2 Bus” shown in FIG. 1, and is a three-phase separation type, so it consists of six bus bars. Each of the three disconnectors (DS) is a part corresponding to the single disconnector (DS) shown in Figure 1, and is connected to each of the three busbars and is used to separate the circuits of each bay for maintenance and inspection of the substation. do. Each of the three ground disconnectors (DS/ES) corresponds to the disconnector (DS) and ground switch (ES) arranged adjacent to each other in Figure 1, and the disconnector (DS) and ground switch (ES) connected to each of the three busbars. ) can be implemented as a three-way switch combined. Each of the three circuit breakers (CB) is a part corresponding to each circuit breaker (CB) shown in FIG. 1 and is used to block overcurrent when an overcurrent occurs due to a short circuit or ground fault in the power system.

The gas pressure gauge (GM) is used to measure the pressure value of SF ₆ gas charged inside the main body of each bay. The insulating gas charged inside the main body of each bay may be a type of gas other than SF ₆ gas. Each of the three transformers (PT) is used to measure the voltage value of the current flowing in each phase of each bay. Each of the three current transformers (CT) is used to measure the current value of the current flowing in each phase of each bay. Each of the three plug-in sockets (PS, Plug-in Socket) is a socket into which a power cable is inserted to connect one of the dual busbars of the busbar unit 20 to the power system. If the main body shown in FIG. 2 is the main body of the first feeder bay 22, the power cable connected by the plug-in socket (PS) becomes the distribution line 10. If the main body shown in FIG. 2 is the main body of the main bay 21, the power cable connected to the plug-in socket (PS) becomes a power cable connected to the main transformer (1).

According to the example shown in Figure 2, the main body of each bay includes three disconnectors (DS), three ground disconnectors (DS/ES), a gas pressure gauge (GM), three transformers (PT), and three current transformers (CT). , and three plug-in sockets (PS). The body of each bay shown in FIG. 2 may be one of the main bay 21, the first feeder bay 22, or the second feeder bay 23. The local control panel of each bay is installed in each bay to monitor the main body status of each bay and control main body operation, including the DS manipulator (DSM, Disconnecting Switch Manipulator), CB manipulator (CBM, Circuit Breaker Manipulator), and supervisory control. It consists of a module 200.

The DS operator (DSM) closes or opens each of the three disconnectors (DS) and the three ground disconnectors (DS/ES) under the control of the supervisory control module 200. The CB operator (CBM) turns on or opens each of the three circuit breakers (CB) described above under the control of the monitoring control module 200. The monitoring control module 200 is a circuit for monitoring the main body status of each bay of the gas insulated switchgear and controlling the main body operation of each bay. It is equipped with relays and various measuring instruments to monitor the status of each bay, and is operated by the user. Alternatively, when each bay malfunctions, an operation signal is received from the relay to open each of the DS manipulator (DSM) and CB manipulator (CBM).

Figure 3 is an example of a failure in the direct current supply line of the GIS substation shown in Figure 1. As described above, the UPS 4 serves to convert direct current power charged in the battery into alternating current power and supply it to the power system and converter 5 in the event of an emergency such as a power outage. The main causes of power loss in the substation that cannot be solved by UPS (4) are as follows. Firstly, the converter 5 is broken. This case is mainly caused by aging deterioration of the converter's internal components or overcurrent damage. Second, this is a case where the direct current supply line between the converter (5) and the gas insulated switchgear (2) is disconnected. In this case, it is mainly caused by a short circuit between wires due to damage to the wiring coating, or loosening of the screws in the screw connection part of the terminal block.

Thirdly, there is a case where the wiring between two neighboring bays is disconnected. The monitoring control module 200 of the local control panel receives direct current power through these bay-to-bay connections and shares status information of various manipulators. Fourth, the internal wiring of the gas insulated switchgear is disconnected. Fifth, there is a case where the power supply to the wiring network is interrupted by an operator to inspect the wiring network within the substation. As shown in FIG. 3, when the converter 5 fails or the DC supply line is disconnected, the power supply to the monitoring control module 200 is cut off, making control of the gas insulated switchgear impossible. In other words, control of the operation of the circuit breaker by the monitoring control module 200 becomes impossible, and various accidents may occur.

FIG. 4 is a configuration diagram of the monitoring and control module 200 of the local control panel shown in FIG. 2. Referring to FIG. 4, the monitoring control module 200 of the local control panel shown in FIG. 2 includes a monitoring control circuit 201, a user interface 202, a relay 203, a battery 204, and three MCCBs (Molded Case Circuit Breaker) (205, 206, 207). As shown in FIG. 4, the local control panel according to this embodiment has a built-in rechargeable direct current supply device consisting of a relay 203, a battery 204, and three MCCBs 205, 206, and 207. The monitoring control circuit 201 and the user interface 202 are driven by direct current power supplied through the direct current supply line of the substation.

The direct current supply line shown in FIG. 4 is a two-strand line connected to the output terminal of the converter 5 and consists of a positive line (P) and a negative line (N). The solid line shown in FIG. 4 represents a power line for transmitting direct current power supplied through the direct current supply line of this substation, and the dotted line shown in FIG. 4 represents the state of the gas insulated switchgear (2) or the disconnector (DS). , indicates a signal line for transmitting signals to control the circuit breaker (CB). In Figure 4, "P" represents the positive terminal, and "N" represents the negative terminal of each of the monitoring circuit 2011, the control circuit 2012, the user interface 202, and the battery 204. Hereinafter, the positive terminal of the monitoring and control circuit 201 refers to the common positive terminal of the monitoring circuit (2011) and the control circuit (2012), and the negative terminal of the monitoring and controlling circuit 201 refers to the common positive terminal of the monitoring circuit (2011) and the control circuit (2012). refers to the common negative terminal of

The monitoring and control circuit 201 is driven by direct current power supplied through the direct current supply line of the substation to monitor and control the gas insulated switchgear (2). Referring to FIG. 4, the monitoring and control circuit 201 consists of a monitoring circuit 2011 and a control circuit 2012. The monitoring circuit (2011) has its power input terminal connected to the DC supply line of the substation and is driven by DC power supplied through the DC supply line of the substation. The gas pressure value of each bay is measured by a gas pressure gauge (GM). , each bay of the gas insulated switchgear 2 shown in FIG. 2 based on the voltage value of each phase measured by each of the three transformers (PT) and the current value of each phase measured by each of the three current transformers (CT). Monitor the status of In order to monitor the status of each bay, the monitoring circuit 2011 may be equipped with a power meter that calculates the amount of power in each phase based on the voltage value of each phase and the current value of each phase, a power factor meter that calculates the power factor, etc.

The control circuit (2012) has its power input terminal connected to the DC supply line of the substation and is driven by DC power supplied through the DC supply line of the substation. The status of each bay or the user is being monitored by the monitoring circuit (2011). According to the operation, the operation of each of the three disconnectors (DS), each of the three ground disconnectors (DS/ES), and each of the three circuit breakers (CB) are controlled. For example, the control circuit 2012 opens the circuit breaker (CB) installed on the line of the phase when the current value of any phase of each bay being monitored by the monitoring circuit 2011 exceeds the reference current value preset by the user. You can. This can be implemented with an overcurrent relay (OCR) connected to each circuit breaker (CB). The control circuit 2012 turns on or opens at least one of three disconnectors (DS), three ground disconnectors (DS/ES), and three circuit breakers (CB) according to a user operation command input through the user interface 202. You can do it.

The user interface 202 has its power input terminal connected to the DC supply line of the substation and is driven by DC power supplied through the DC supply line of the substation. The user receives three disconnectors (DS) and three ground disconnectors (DS). /ES), receives operation commands for the three circuit breakers (CB) or displays the status of each bay being monitored by the monitoring circuit (2011) to the user. For example, the user interface 202 may receive a command from the user to open three disconnectors (DS) for maintenance, inspection, etc. of the substation. If the gas pressure value of a bay being monitored by the monitoring circuit 2011 is less than the standard pressure value, the user interface 202 may display an alarm indicating that the gas pressure value of the bay is less than the standard pressure value. The user interface 202 may be implemented as a combination of a display panel and a touch screen panel, or as a combination of a plurality of buttons and lamps.

The relay 203 includes an A contact 2031 and a B contact 2032 that are turned on or off in opposite directions depending on whether DC power is supplied to the monitoring and control circuit 201 through the DC supply line of the substation. One end of the A contact point 2031 of the relay 203 is connected to the positive line (P) of the direct current supply line of the substation, and the other end is connected to the positive terminal of the battery 204. One end of the B contact point 2032 of the relay 203 is connected to the positive terminal of the supervisory control circuit 201, and the other end is connected to the positive terminal of the battery 204.

The battery 204 has its positive terminal connected to the A contact point 2031 and B contact point 2032 of the relay 203, and its negative terminal connected to the negative line (N) of the DC supply line of the substation. While the supply of direct current power to the supervisory control circuit 201 through (N) is interrupted, it is discharged and serves to supply direct current power to the supervisory control circuit 201. The battery 204 serves to supply direct current power to the monitoring and control circuit 201. The battery 204 normally supplies direct current power to the supervisory control circuit 201 in order to supply direct current power to the supervisory control circuit 201 while the supply of direct current power to the supervisory control circuit 201 through the direct current supply line of the substation is interrupted. It is charged while being supplied. The battery 204 of this embodiment is preferably a lithium ion battery with high energy storage density.

The first MCCB (205) is inserted between the positive line (P) of the DC supply line of the substation and the positive terminal of the power input terminal of the monitoring control circuit 201, and flows into the monitoring control circuit 201 from the DC supply line of the substation. It opens only when the amount of current exceeds the reference current value preset by the user. In a normal state where the magnitude of the current flowing into the monitoring and control circuit 201 from the DC supply line of the substation is less than or equal to the reference current value, the input state of the first MCCB (205) is maintained. The first MCCB (205) serves to protect the monitoring and control circuit (201) from overcurrent flowing from the converter (5).

The second MCCB (206) is inserted between the positive line (P) of the substation's DC supply line and the other end of the A contact point (2031) of the relay 203 to control the current flowing into the battery 204 from the substation's DC supply line. It opens only when its size exceeds a reference current value preset by the user. In a normal state where the magnitude of the current flowing into the battery 204 from the DC supply line of the substation is below the reference current value, the input state of the second MCCB 206 is maintained. The second MCCB (206) serves to protect the battery 204 from overcurrent flowing from the converter (5).

The third MCCB (207) is inserted between one end of the B contact point (2032) of the relay (203) and the positive terminal of the power input terminal of the supervisory control circuit (201), and flows into the supervisory control circuit (201) from the battery (204). It opens only when the amount of current exceeds the reference current value preset by the user. In a normal state where the magnitude of the current flowing from the battery 204 to the monitoring and control circuit 201 is less than or equal to the reference current value, the closed state of the third MCCB (207) is maintained. The third MCCB (207) serves to protect the monitoring and control circuit (201) from overcurrent flowing from the battery (204).

FIG. 5 is a diagram showing the supply path of DC power when DC power is supplied to the monitoring and control circuit 201 shown in FIG. 4. In Figure 5, the supply path of direct current power is indicated by a dashed-dotted line. Referring to FIG. 5, while direct current power is supplied to the monitoring and control circuit 201 through the direct current supply line of the substation, the A contact point 2031 of the relay 203 is turned on and the B contact point 2032 of the relay 203 is turned on. is turned off so that the battery 204 is charged by direct current power supplied through the direct current supply line of the substation. The positive terminal of the battery 204 is connected to the positive line (P) of the direct current supply line of the substation through the A contact point 2031 of the relay 203 depending on whether direct current power is supplied to the monitoring and control circuit 201. The negative terminal of the battery is always connected to the negative line (N) of the substation's direct current supply line.

While direct current power is supplied to the monitoring and control circuit 201 through the direct current supply line of the substation, the A contact point 2031 of the relay 203 is turned on, and the positive terminal of the battery 204 is connected to the A contact point 2031 of the relay 203. It is connected to the anode line of the DC supply line of the substation through and the battery 204 is charged by DC power supplied through the DC supply line of the substation. At the same time, while direct current power is supplied to the monitoring and control circuit 201 through the direct current supply line of the substation, the B contact point 2032 of the relay 203 is turned off, thereby causing the battery ( The connection between the positive terminal of the battery 204 and the positive terminal of the monitoring and control circuit 201 is cut off, so that discharge from the battery 204 to the monitoring and controlling circuit 201 is blocked.

FIG. 6 is a diagram showing the path of DC power when the supply of DC power to the monitoring and control circuit 201 shown in FIG. 4 is stopped. In Figure 6, the supply path of direct current power is indicated by a dashed line. Referring to FIG. 6, while the supply of direct current power to the monitoring and control circuit 201 through the direct current supply line of the substation is interrupted, the A contact point 2031 is turned off and the B contact point 2032 of the relay 203 is turned on, thereby discharging the battery. The DC power discharged from (204) is supplied to the monitoring and control circuit (201). The positive terminal of the battery 204 is connected to the positive terminal of the power input terminal of the supervisory control circuit 201 through the B contact point 2032 of the relay 203 depending on whether direct current power is supplied to the supervisory control circuit 201. . The negative terminal of the power input terminal of the monitoring and control circuit 201 is always connected to the negative line (N) of the direct current supply line of the substation.

While the supply of direct current power to the monitoring and control circuit 201 through the direct current supply line of the substation is interrupted, the A contact point 2031 of the relay 203 is turned off, thereby supplying direct current to the substation through the A contact point 2031 of the relay 203. The connection between the positive line of the line and the positive terminal of the battery 204 is disconnected, and the monitoring and control circuit 201 is electrically separated from the direct current supply line of the substation. At the same time, while the supply of direct current power to the monitoring and control circuit 201 through the direct current supply line of the substation is interrupted, the B contact point 2032 of the relay 203 is turned on, so that the positive terminal of the battery 204 is connected to the B contact point of the relay 203. It is connected to the positive terminal of the power input terminal of the monitoring control circuit 201 through the contact point 2032, and direct current power discharged from the battery 204 is supplied to the monitoring control circuit 201.

According to the embodiment of the present invention as described above, while direct current power is supplied to the monitoring control circuit 201 of the gas insulated switchgear 2 through the direct current supply line of the substation, the A contact 2031 of the relay 203 is turned on and the B contact point 2032 is turned off, so that the battery is charged by DC power supplied through the DC supply line, and while the supply of DC power to the monitoring and control circuit 201 through the DC supply line of the substation is interrupted, the relay As contact A turns off and contact B turns on, the DC power discharged from the battery is supplied to the supervisory control circuit 201, resulting in failure of the converter 5 and the DC power between the converter 5 and the gas insulated switchgear 2. Even when a problem with the supply of direct current power that cannot be solved by the UPS (4), such as a disconnection of the supply line, occurs, it is possible to supply direct current power to the gas insulated switchgear (2).

As a result, even if a DC power supply problem that cannot be solved by UPS occurs, such as a failure of the converter (5) or disconnection of the DC supply line between the converter and the gas insulated switchgear (2), the gas insulated switchgear (2) As control becomes possible, various accidents caused by the inability to control the gas insulated switchgear can be prevented, thereby preventing damage to property and casualties. In addition, when inspecting and repairing the wiring network within the substation, inspection and repair are possible without loss of direct current power to the gas insulated switchgear (2). In particular, as the charging and discharging of the battery is controlled using only relays rather than a software control method using a microprocessor, highly reliable direct current power supply that is not affected by software virus infection, etc. is possible.

So far, the present invention has been looked at with a focus on preferred embodiments. A person skilled in the art to which the present invention pertains will understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the equivalent scope should be construed as being included in the present invention.

1 ... peripheral transformer
2 ... gas insulated switchgear
3 ... On-site transformer
4...UPS
5 ... converter
6 ... AC equipment
10 ... distribution line
20 ... mother ship unit
21 ... Main Bay
22, 23... Feeder Bay
24 ... Taipei
25 ... section bay
200 ... monitoring control module
201 ... supervisory control circuit
2011 ... Supervision circuit
2012 ... Control Circuit
202 ... user interface
203 ... relay
2031 ... A contact
2032 ... B contact
204 ... battery
205, 206, 207... MCCB

Claims (9)

In the local control panel of a gas insulated switchgear with a built-in rechargeable direct current supply device,
It is driven by direct current power supplied through the direct current supply line of the substation and includes a monitoring and control circuit that monitors the status of each bay of the gas insulated switchgear and controls the operation of the gas insulated switchgear,
The DC supply line is a two-strand line connected to the output terminal of a converter that converts AC power supplied from the transformer of the substation or UPS (Uninterruptible Power Supply) into DC power and supplies it to the local control panel. The anode line and It consists of a cathode line,
a relay having contact points A and B that are turned on or off in opposite directions depending on whether direct current power is supplied to the monitoring and control circuit through the direct current supply line; and
The positive terminal is connected to the A and B contacts of the relay, and the negative terminal further includes a battery connected to the negative line of the direct current supply line,
The positive terminal of the battery is connected to the positive line of the direct current supply line through the A contact point of the relay or to the positive terminal of the supervisory control circuit through the B contact point of the relay,
While DC power is supplied to the monitoring and control circuit through the DC supply line, the A contact point is turned on and the B contact point is turned off, so that the battery is charged by the DC power supplied through the DC supply line,
While the supply of direct current power to the supervisory control circuit through the direct current supply line is interrupted, the contact point A is turned off and the contact point B is turned on, so that the direct current power discharged from the battery is supplied to the supervisory control circuit. local control panel. According to claim 1,
One end of the A contact point is connected to the positive line of the direct current supply line and the other end is connected to the positive terminal of the battery,
While DC power is supplied to the monitoring and control circuit through the DC supply line, the A contact point is turned on, so that the positive terminal of the battery is connected to the positive line of the DC supply line through the A contact point and is supplied through the DC supply line. A local control panel, characterized in that the battery is charged by direct current power. According to claim 2,
While the supply of direct current power to the monitoring and control circuit through the direct current supply line is interrupted, the contact point A is turned off, thereby disconnecting the positive line of the direct current supply line through the contact point A and the positive terminal of the battery. A local control panel wherein the monitoring and control circuit is electrically separated from the direct current supply line. According to claim 2,
A local circuit breaker is inserted between the anode line of the direct current supply line and the other end of the A contact point and is opened when the amount of current flowing into the battery from the direct current supply line exceeds a reference current value. panel. According to claim 2,
One end of the B contact point is connected to the positive terminal of the supervisory control circuit and the other end is connected to the positive terminal of the battery,
While direct current power is supplied to the supervisory control circuit through the direct current supply line, the contact point B is turned off, thereby disconnecting the positive terminal of the battery and the positive terminal of the supervisory control circuit through the contact point B, thereby disconnecting the battery from the battery. A local control panel, characterized in that discharge to the supervisory control circuit is blocked. According to claim 5,
While the supply of direct current power to the supervisory control circuit through the direct current supply line is interrupted, the B contact point is turned on, so that the positive terminal of the battery is connected to the positive terminal of the supervisory control circuit through the B contact point, thereby discharging the battery. A local control panel, characterized in that direct current power is supplied to the supervisory control circuit. According to claim 2,
A local circuit breaker is inserted between one end of the B contact point and the positive terminal of the supervisory control circuit and opens when the amount of current flowing from the battery into the supervisory control circuit exceeds a reference current value. panel. According to claim 1,
It further includes a circuit breaker that is inserted between the positive line of the direct current supply line and the positive terminal of the monitoring control circuit and is opened when the magnitude of the current flowing into the monitoring control circuit from the direct current supply line exceeds the reference current value. Features a local control panel. A main body that receives the power reduced by the main transformer of the substation or supplies the received power to the distribution line of the power system; and
A gas insulated switchgear as claimed in claim 1, comprising a local control panel that monitors the status of the main body and controls the operation of the main body.

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