CN115549041A - Unmanned power system and control method - Google Patents
Unmanned power system and control method Download PDFInfo
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- CN115549041A CN115549041A CN202211308344.XA CN202211308344A CN115549041A CN 115549041 A CN115549041 A CN 115549041A CN 202211308344 A CN202211308344 A CN 202211308344A CN 115549041 A CN115549041 A CN 115549041A
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- isolating switch
- grounding
- disconnecting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses an unmanned operation power system, which comprises: the main branch line with high voltage is input and connected to a power distribution network, and comprises a first isolating switch, a first breaker and a second isolating switch which are sequentially connected in series; the isolation switches are arranged on the main branch line, and the grounding isolation disconnecting links and the voltage transformer are arranged on the main branch line, and the other end of the grounding isolation disconnecting links is grounded; and the measurement and control center is connected with the plurality of bypass branches, the first disconnecting switch, the first circuit breaker and the second disconnecting switch and controls the states of the first disconnecting switch, the first circuit breaker and the second disconnecting switch according to the on-off and/or detection voltage of the disconnecting switch, the grounding disconnecting switch and the voltage transformer, so that the power-off of the main branch is realized. The control method provided by the invention is operated according to a plurality of steps, and the operation result of the previous step is self-checked before each operation step, so that misoperation is prevented, and the operation safety is ensured.
Description
Technical Field
The invention relates to a power control system, in particular to an unmanned power system and a control method.
Background
The supply of electric power brings civilization to human beings, and the demand of electric power cannot be kept away from the human beings in all kinds. At present, partial personnel are required to carry out on-site power cut and transmission operation in China power system management. Wherein, in the power grid maintenance, urgent defect treatment, power grid distribution, normal power failure construction, all need personnel field processing. At present, the power grid in China transregional adopts ultrahigh voltage power transmission, and then the power is transformed into high voltage or industrial voltage in cities, and the voltages are all relatively high, so that serious safety risk exists on human bodies. In operation, once misoperation occurs in operation, large-area power failure is caused in a large-scale power supply system, equipment and facilities are damaged, huge economic loss is brought to the country, casualties are inevitably caused, and the family is unfortunate.
Disclosure of Invention
The invention aims to provide an unmanned operation power system, and aims to solve the technical problems of casualties and misoperation caused by manual operation in the prior art. The invention discloses an unmanned operation power system, comprising:
a main bus and a bypass bus each having an input high voltage thereon;
the main branch line comprises a first isolating switch, a first circuit breaker and a second isolating switch which are sequentially connected in series, one end of the first isolating switch is connected with the main bus, the other end of the first isolating switch is connected with the first circuit breaker, one end of the second isolating switch is connected with the power distribution network, and the other end of the second isolating switch is connected with the first circuit breaker;
one end of the third isolating switch is connected with one end of the second isolating switch, and the other end of the third isolating switch is connected with the bypass bus;
one end of the first grounding isolation disconnecting link is connected with one end of the second isolation switch, and the other end of the first grounding isolation disconnecting link is connected with the grounding terminal;
one end of the second grounding isolation disconnecting link is connected with the input end of the first isolation switch, and the other end of the second grounding isolation disconnecting link is connected with a grounding end;
one end of the first voltage transformer is connected with the input end of the power distribution network;
one end of the second voltage transformer is connected with the main circuit bus;
the measurement and control center is electrically connected with the other ends of the first voltage transformer and the second voltage transformer and is used for acquiring mutual induction voltages on the first voltage transformer and the second voltage transformer;
the measurement and control center is also in communication connection with the first disconnecting switch, the first circuit breaker, the second disconnecting switch, the third disconnecting switch, the first grounding isolation disconnecting link and the second grounding isolation disconnecting link and used for receiving and controlling the control state of the measurement and control center.
In the power system, a main bus is adopted for supplying power during normal operation, a bypass bus is adopted for standby power supply after the main bus is powered off, the main bus is controlled by a third isolating switch which is not controlled by a person, the third isolating switch is controlled by the measurement and control center to be closed under the condition that the first voltage transformer detects that the main bus is not supplied with power, and the third isolating switch is in a normally open state under other conditions.
When the main branch line is subjected to power-off operation, the first circuit breaker is disconnected through the measurement and control center, the second isolating switch is disconnected remotely, self-checking is performed after operation, then the first isolating switch is disconnected, it is ensured that no voltage exists at two ends of the first circuit breaker, the first isolating switch and the second isolating switch are disconnected simultaneously, the first grounding isolating switch is closed after the self-checking is completed, the reverse voltage of a power distribution network can be avoided at the moment, and the safety of the main branch line needing to be maintained is ensured. In the invention, each step of operation needs to carry out self-checking on the state of the previous step of operation, and the remote control measurement and control center is combined to complete the switching operation, thereby avoiding manual operation.
The invention aims to provide an unmanned electric power control method, and aims to solve the technical problems of casualties and misoperation caused by manual operation in the prior art.
The invention discloses an unmanned operation power control method, which comprises the following steps:
step 1: setting a power system according to the above content;
and 2, step: the main branch line is powered off according to a power-off maintenance method so as to facilitate maintenance; the power-off maintenance method comprises the following steps:
step 21, the measurement and control center disconnects the first breaker;
step 22, judging whether the step 21 is finished, if not, stopping the operation, and if so, controlling the second isolating switch to be disconnected by the measurement and control center;
step 23: judging whether the step 22 is finished or not, if not, stopping the operation, and if so, controlling the first isolating switch to be disconnected by the measurement and control center;
step 24: judging whether the step 22 is finished or not, if not, stopping the operation, if so, judging whether the third isolating switch is in an off state, and if so, executing the step 25; otherwise, go to step 26;
step 25: judging whether a mutual induction voltage exists on a first voltage transformer according to the first voltage transformer, if no voltage exists, controlling the first grounding isolation switch to be closed by the measurement and control center, and executing the step 27; otherwise, executing step 26;
step 26: the measurement and control center controls the first grounding disconnecting link to be in a normally-disconnected state;
step 27: and (4) judging whether the step (25) is finished, if not, stopping operation, if so, detecting whether voltage exists on the second voltage transformer, if so, controlling the second grounding isolation switch to be in a normally-off state, and if not, controlling the second grounding isolation switch to be closed.
The method comprises the steps of firstly carrying out unmanned operation on a first circuit breaker, disconnecting a main line branch, and then disconnecting second disconnecting switches and first disconnecting switches in front of and behind the first circuit breaker to ensure that the first circuit breaker is not in a high-voltage working state; self-checking the state of a third isolating switch on the bypass bus to ensure that the third isolating switch is in a disconnected state and a main circuit branch line has no high voltage; detecting the voltage of an input end of a power distribution network by using a first voltage transformer, ensuring that no voltage is input into the power distribution network, and then controlling a first grounding isolation switch to be closed; particularly, the voltage on the third isolating switch and the first voltage transformer is self-checked before the first grounding isolating switch is closed, so that the first grounding isolating switch is disconnected and cannot be grounded when the third isolating switch is closed or the first voltage transformer detects that voltage exists, and the power failure caused by direct grounding of high voltage is prevented; when the first grounding isolation disconnecting link is closed, the influence of a rear-end power distribution network on the voltage on the front-end main circuit branch line can be avoided, and the personnel safety is ensured. Finally, the voltage of the main circuit bus is detected according to the second voltage transformer, and when the voltage of the main circuit bus is electrified, the second grounding isolation switch is controlled to be in a normally-off state; and when the main circuit bus does not have voltage, the second grounding isolation disconnecting link is controlled to be closed, so that the circuit safety is ensured.
The control method provided by the invention operates the first isolating switch, the first circuit breaker, the second isolating switch, the first grounding isolating disconnecting link, the second grounding isolating disconnecting link, the first voltage transformer and the second voltage transformer according to a plurality of steps, the operation result of the previous step needs to be self-checked before each operation step, misoperation is prevented, and the next operation can be completed after the self-checking is completed, so that the operation safety is ensured.
The invention remotely controls the electrical equipment through the measurement and control center, thereby avoiding manual operation and avoiding the occurrence of manual irregular operation, and further improving the safety.
Drawings
FIG. 1 is a schematic diagram of the electrical connections of the unmanned operating power system of the present invention;
figure 2 is a schematic diagram of the electrical connection of the power distribution network of the present invention.
Detailed Description
The invention will be further elucidated and described with reference to the embodiments and drawings of the specification:
referring to fig. 1, an unmanned operating power system of the present invention includes: the main circuit bus, the bypass bus, the main circuit branch line and the measurement and control center.
Wherein the main bus and the bypass bus each have an input high voltage thereon. The high voltage is derived from the ac/dc trans-regional transmission voltage.
The main branch line is a power line entering a transformer substation and inside the transformer substation, and the transformer substation acquires power through the main branch line, transmits the power to a power distribution network after power transformation and distributes the power to each power distribution center of a city. The main branch line comprises a first isolating switch, a first breaker and a second isolating switch which are sequentially connected in series, one end of the first isolating switch is connected with the main bus, the other end of the first isolating switch is connected with the power distribution network, the other end of the first isolating switch is connected with the first breaker, one end of the second isolating switch is connected with the power distribution network, and the other end of the second isolating switch is connected with the first breaker. In this embodiment, the first and second disconnectors are mechanical disconnecting switches that physically disconnect or close the main branch line, and the first circuit breaker is an electrically controlled disconnecting device that internally electrically disconnects or disconnects the main branch line.
This electric power system still includes: the third isolating switch, the first grounding isolating disconnecting link and the second grounding isolating disconnecting link.
One end of the third isolating switch is connected with one end of the second isolating switch, and the other end of the third isolating switch is connected with the bypass bus.
The third isolating switch is mainly used for switching power transformation power standby, when no voltage exists on a main circuit bus and voltage needs to be output to a power distribution network, the third isolating switch is closed when power is guaranteed, and the third isolating switch is in a normally-off state under other conditions.
One end of the first grounding isolation disconnecting link is connected with one end of the second isolation switch, and the other end of the first grounding isolation disconnecting link is connected with the grounding end; one end of the second grounding isolation disconnecting link is connected with the input end of the first isolation switch, and the other end of the second grounding isolation disconnecting link is connected with the grounding end. The first grounding isolation disconnecting link is a safety grounding device at the front end of the power distribution network, and when power failure occurs on the main branch line, the influence of power distribution network power on the front end is prevented from causing, and power accidents occur due to reverse flow of voltage on the main branch line. The input end of the first grounding isolation disconnecting link power distribution network is closed when no voltage exists, and the safety of the front-end main circuit branch line can be protected. When the third isolation switch is closed and other conditions exist, the first grounding isolation disconnecting link is in a normally-open state. Particularly, when the third disconnecting switch is closed, the first grounding disconnecting switch is forbidden to be grounded, and the standby high voltage from the main circuit branch line is directly grounded, so that the circuit damage and the power accident are caused.
The power system also comprises a first voltage transformer and a second voltage transformer, wherein one end of the first voltage transformer is connected with a main circuit bus at the input end of the power distribution network; one end of the second voltage transformer is connected with the main circuit bus.
The first voltage transformer is used for detecting the voltage state on the power distribution network, and when no input voltage exists on the power distribution network, the first grounding isolation knife switch can be closed. The second voltage transformer is used for detecting whether the main circuit bus has voltage, and when the main circuit bus has voltage, the second grounding isolation switch is in a normally-off state; when no voltage exists on the main circuit bus, the second grounding isolation switch is controlled to be closed, so that the main circuit bus can be prevented from being suddenly electrified or the reverse flow influence of the voltage on the main circuit branch line can be prevented, and the operation safety on the main circuit branch line can be ensured.
The measurement and control center is electrically connected with the other ends of the first voltage transformer and the second voltage transformer and is used for acquiring mutual induction voltages on the first voltage transformer and the second voltage transformer;
the measurement and control center is also in communication connection with the first disconnecting switch, the first circuit breaker, the second disconnecting switch, the third disconnecting switch, the first grounding isolation disconnecting link and the second grounding isolation disconnecting link and used for receiving and controlling the control state of the measurement and control center.
In this embodiment, the remote unmanned operation of observing and controling center through right first isolator, first circuit breaker, second isolator, third isolator, first ground connection isolation switch, second ground connection isolation switch accomplishes the power failure maintenance of main road branch line, and in the maintenance process, carry out the self-checking to the operation of last step before operation at every turn according to above operation process to the condition that the assurance does not have the maloperation takes place.
Specifically, the measurement and control center controls the first disconnecting switch, the first circuit breaker and the second disconnecting switch to be switched on and off, controls the third disconnecting switch, the first grounding disconnecting switch and the second grounding disconnecting switch to be switched off and switched off according to mutual inductance voltages of the first voltage transformer and the second voltage transformer, detects the states of the first disconnecting switch, the first circuit breaker, the second disconnecting switch, the third disconnecting switch, the first grounding disconnecting switch and the second grounding disconnecting switch which are switched off and switched off last time before each time of switching off and switching off, and performs the next operation when the states are configured to allow the operation.
Referring to fig. 2, in the present invention, the power distribution network includes: distribution branch, third ground connection isolation switch and distribution control center.
One end of a power distribution branch is connected to the main line branch, the other end of the power distribution branch is connected to a load, and the power distribution branch is used for acquiring power distribution; the power distribution branch comprises a fourth disconnecting switch, a second circuit breaker and a fifth disconnecting switch which are connected in sequence; one end of the fourth isolating switch is connected with the main branch line, the other end of the fourth isolating switch is connected with the second circuit breaker, one end of the fifth isolating switch is connected with the load, and the other end of the fifth isolating switch is connected with the second circuit breaker;
one end of the third grounding isolation disconnecting link is connected with the load input end, and the other end of the third grounding isolation disconnecting link is connected with the grounding end;
the power distribution control center is respectively connected with the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch, and is used for controlling the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch to be disconnected and closed.
Furthermore, the power distribution network further comprises a live induction tester arranged near the output end of the power distribution branch, and the live induction tester is used for detecting the voltage on the power distribution branch; the electrified induction tester is connected with the power distribution control center and used for sending detection signals to the power distribution control center.
The distribution control center controls the disconnection or the connection of a fourth disconnecting switch, a second circuit breaker and a fifth disconnecting switch, controls the disconnection and the connection of a third grounding disconnecting switch according to the test voltage of the electrified induction tester, detects the state of the fourth disconnecting switch, the second circuit breaker, the fifth disconnecting switch and the third grounding disconnecting switch which are disconnected and connected last time before the disconnection and the connection of each time, and performs the next operation when the distribution control center is configured to allow the operation.
The invention also discloses an unmanned operation power control method. The method comprises the following steps:
step 1: the power system is set according to the above.
Step 2: the main branch line is powered off according to a power-off maintenance method so as to facilitate maintenance; the power-off maintenance method comprises the following steps:
step 21, the measurement and control center disconnects the first breaker;
step 22, judging whether the step 21 is finished, if not, stopping the operation, and if so, controlling the second isolating switch to be disconnected by the measurement and control center;
step 23: judging whether the step 22 is finished or not, if not, stopping the operation, and if so, controlling the first isolating switch to be disconnected by the measurement and control center;
step 24: judging whether the step 22 is finished or not, if not, stopping the operation, if so, judging whether the third isolating switch is in an off state, and if so, executing the step 25; otherwise, go to step 26;
step 25: judging whether a mutual induction voltage exists on a first voltage transformer according to the first voltage transformer, if no voltage exists, controlling the first grounding isolation switch to be closed by the measurement and control center, and executing the step 27; otherwise, executing step 26;
step 26: the measurement and control center controls the first grounding disconnecting link to be in a normally-disconnected state;
step 27: judging whether the step 25 is finished or not, if not, stopping the operation, if so, judging whether voltage exists on the second voltage transformer, if so, controlling the second grounding isolation switch to be in a normally-off state, and if not, controlling the second grounding isolation switch to be closed;
and step 3: and powering on the main circuit branch according to a power-on maintenance method.
Wherein the step 3 comprises the following steps:
step 31: detecting whether the first grounding isolation switch is in a disconnected state, if not, controlling the first grounding isolation switch to be disconnected, and if so, executing a step 32;
step 32, judging whether the step 31 is finished, if not, executing the step 32, if so, controlling the third isolating switch and the second grounding isolating switch to be in an off state, otherwise, controlling the third isolating switch and the second grounding isolating switch to be off, and if so, executing the step 33; step 33: judging whether the step 32 is finished, if not, executing the step 33, and if so, controlling the first isolating switch to be closed;
step 34: judging whether the step 33 is finished, if not, executing the step 33, and if so, controlling the second isolating switch to be closed;
step 35: and judging whether the step 34 is finished, if not, executing the step 34, and if so, controlling the first breaker to be closed.
Further, the step 1 further comprises:
step 11: setting up a power distribution network according to the above;
further, the method further comprises:
and 4, step 4: the power distribution branch is powered off according to a power-off maintenance method so as to facilitate maintenance; the power-off maintenance method for the power distribution branch circuit comprises the following steps:
step 41: the power distribution control center controls the second circuit breaker to be opened;
step 42: detecting whether step 41 is completed, if not, stopping execution; if the operation is finished, controlling the fifth isolating switch to be disconnected;
step 43: detecting whether the step 42 is finished, if the execution is not finished, stopping the execution, and if the step is finished, controlling the fourth isolating switch to be switched off;
step 44: detecting whether the step 43 is completed, if not, stopping the execution, if so, determining whether the load has a voltage, if so, controlling the third ground isolation switch to be in an open state, and if not, controlling the third ground isolation switch to be closed.
And 5: and powering on the power distribution branch circuit according to a power-on maintenance method.
Further, the method step 5 comprises:
step 51: controlling the third grounding isolation switch to be disconnected;
step 52: detecting whether the step 51 is finished, if not, stopping the operation, and if so, controlling the fourth isolating switch to be closed;
step 53: detecting whether the step 52 is finished, if not, stopping the operation, and if so, controlling the fifth isolating switch to be closed;
step 54: and detecting whether the step 53 is finished, if not, stopping the operation, and if so, controlling the second circuit breaker to be closed. The method comprises the following steps of firstly carrying out unmanned operation on a first circuit breaker, disconnecting a main line branch, and then disconnecting second disconnecting switches and first disconnecting switches in front of and behind the first circuit breaker, so as to ensure that the first circuit breaker is not in a long-time high-voltage working state; self-checking the state of a third isolating switch on the bypass bus to ensure that the third isolating switch is in a disconnected state and a main circuit branch line has no high voltage; detecting the voltage of the input end of a power distribution network by using a first voltage transformer, ensuring that no voltage is input into the power distribution network, and then controlling a first grounding isolation switch to be closed; particularly, the voltage on the third isolating switch and the first voltage transformer is self-checked before the first grounding isolating switch is closed, so that the first grounding isolating switch is disconnected and cannot be grounded when the third isolating switch is closed or the first voltage transformer detects that voltage exists, and the power failure caused by direct grounding of high voltage is prevented; when the first grounding isolation disconnecting link is closed, the influence of a rear-end power distribution network on the voltage on the front-end main circuit branch line can be avoided, and the personnel safety is ensured. Finally, the voltage of the main circuit bus is detected according to a second voltage transformer, and when the voltage of the main circuit bus is electrified, the second grounding isolation switch is controlled to be in a normally-off state; and when the main circuit bus does not have voltage, the second grounding isolation disconnecting link is controlled to be closed, so that the circuit safety is ensured.
The control method provided by the invention operates the first isolating switch, the first circuit breaker, the second isolating switch, the first/second grounding isolating disconnecting switch and the first/second voltage transformer according to a plurality of steps, the operation result of the previous step needs to be self-checked before each operation step, misoperation is prevented, and the next operation can be completed after the self-checking is completed, so that the operation safety is ensured.
The invention remotely controls the electrical equipment through the measurement and control center, thereby avoiding manual operation and avoiding the occurrence of manual irregular operation, and further improving the safety.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. An unmanned electrical power system, the system comprising:
a main bus and a bypass bus each having an input high voltage thereon;
the main branch line comprises a first isolating switch, a first circuit breaker and a second isolating switch which are sequentially connected in series, one end of the first isolating switch is connected with the main bus, the other end of the first isolating switch is connected with the first circuit breaker, one end of the second isolating switch is connected with the power distribution network, and the other end of the second isolating switch is connected with the first circuit breaker;
one end of the third isolating switch is connected with one end of the second isolating switch, and the other end of the third isolating switch is connected with the bypass bus;
one end of the first grounding isolation disconnecting link is connected with one end of the second isolation switch, and the other end of the first grounding isolation disconnecting link is connected with the grounding end;
one end of the second grounding isolation disconnecting link is connected with the input end of the first isolation switch, and the other end of the second grounding isolation disconnecting link is connected with a grounding end;
one end of the first voltage transformer is connected with the input end of the power distribution network;
one end of the second voltage transformer is connected with the main circuit bus, and the other end of the second voltage transformer is connected with a grounding end;
the measurement and control center is electrically connected with the other ends of the first voltage transformer and the second voltage transformer and is used for acquiring mutual induction voltages on the first voltage transformer and the second voltage transformer;
the measurement and control center is also in communication connection with the first disconnecting switch, the first circuit breaker, the second disconnecting switch, the third disconnecting switch, the first grounding isolation disconnecting link and the second grounding isolation disconnecting link and used for receiving and controlling the control state of the measurement and control center.
2. The unmanned power system of claim 1, wherein the measurement and control center controls the first disconnecting switch, the first breaker, and the second disconnecting switch to be turned on and off, controls the third disconnecting switch, the first disconnecting switch from ground, and the second disconnecting switch from ground according to mutual inductance voltages of the first voltage transformer and the second voltage transformer, detects a state of the first disconnecting switch, the first breaker, the second disconnecting switch, the third disconnecting switch, the first disconnecting switch from ground, and the second disconnecting switch from ground, which were turned on and off last time before each of the operations, and performs a next operation only when the operation is configured to be permitted.
3. The unmanned operating power system of claim 1, wherein the power distribution network comprises:
one end of the power distribution branch is connected to the main line branch, the other end of the power distribution branch is connected to a load, and the power distribution branch is used for acquiring power distribution; the power distribution branch comprises a fourth disconnecting switch, a second circuit breaker and a fifth disconnecting switch which are connected in sequence; one end of the fourth isolating switch is connected with the main branch line, the other end of the fourth isolating switch is connected with the second circuit breaker, one end of the fifth isolating switch is connected with the load, and the other end of the fifth isolating switch is connected with the second circuit breaker;
one end of the third grounding isolation disconnecting link is connected with the load input end, and the other end of the third grounding isolation disconnecting link is connected with the grounding end;
and the power distribution control center is respectively connected with the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch, and is used for controlling the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch to be disconnected and closed.
4. The unmanned operational power system of claim 3, wherein the power distribution network further comprises a live induction tester disposed proximate the power distribution branch output, the live induction tester configured to detect a voltage on the power distribution branch; the electrified induction tester is connected with the power distribution control center and used for sending detection signals to the power distribution control center.
5. The unmanned power system as claimed in claim 4, wherein the distribution control center controls opening and closing of a fourth disconnector, a second disconnector, and a fifth disconnector, and controls opening and closing of the third earthing isolator blade according to the test voltage of the live induction tester, and detects the state of the fourth disconnector, the second disconnector, the fifth disconnector, and the third earthing isolator blade which were opened and closed last time before each opening and closing, and performs the next operation when configured to allow the operation.
6. An unmanned power control method, the method comprising:
step 1: providing a power system, the power system comprising: a main bus and a bypass bus each having an input high voltage thereon;
the main branch line comprises a first isolating switch, a first circuit breaker and a second isolating switch which are sequentially connected in series, one end of the first isolating switch is connected with the main bus, the other end of the first isolating switch is connected with the first circuit breaker, one end of the second isolating switch is connected with the power distribution network, and the other end of the second isolating switch is connected with the first circuit breaker;
one end of the third isolating switch is connected with one end of the second isolating switch, and the other end of the third isolating switch is connected with the bypass bus;
one end of the first grounding isolation disconnecting link is connected with one end of the second isolation switch, and the other end of the first grounding isolation disconnecting link is connected with the grounding end;
one end of the first voltage transformer is connected with a main circuit bus at the input end of the distribution network, and the other end of the first voltage transformer is connected with the grounding end;
one end of the second voltage transformer is connected with the main circuit bus, and the other end of the second voltage transformer is connected with a grounding end;
the measurement and control center is electrically connected with the first voltage transformer and the second voltage transformer and is used for acquiring mutual induction voltages on the first voltage transformer and the second voltage transformer;
the measurement and control center is also in communication connection with the first disconnecting switch, the first circuit breaker, the second disconnecting switch, the third disconnecting switch, the first grounding isolation disconnecting link and the second grounding isolation disconnecting link;
step 2: the main branch line is powered off according to a power-off maintenance method so as to facilitate maintenance; the power-off maintenance method comprises the following steps:
step 21, the measurement and control center disconnects the first breaker;
step 22, judging whether the step 21 is finished, if not, stopping the operation, and if so, controlling the second isolating switch to be disconnected by the measurement and control center;
step 23: judging whether the step 22 is finished or not, if not, stopping the operation, and if so, controlling the first isolating switch to be disconnected by the measurement and control center;
and step 24: judging whether the step 22 is finished or not, if not, stopping the operation, if so, judging whether the third isolating switch is in an off state, and if so, executing the step 25; otherwise, go to step 26;
step 25: judging whether a mutual induction voltage exists on a first voltage transformer according to the first voltage transformer, if no voltage exists, controlling the first grounding isolation switch to be closed by the measurement and control center, and executing the step 27; otherwise, executing step 26;
step 26: the measurement and control center controls the first grounding disconnecting link to be in a normally-disconnected state;
step 27: and (4) judging whether the step (25) is finished, if not, stopping operation, if so, detecting whether voltage exists on the second voltage transformer, if so, controlling the second grounding isolation switch to be in a normally-off state, and if not, controlling the second grounding isolation switch to be closed.
7. The unmanned operational power control method of claim 6, further comprising:
and 3, step 3: powering on the main circuit branch according to a power-on maintenance method;
the step 3 comprises the following steps:
step 31: detecting whether the first grounding isolation switch is in a disconnected state, if not, controlling the first grounding isolation switch to be disconnected, and if so, executing a step 32;
step 32, judging whether the step 31 is finished, if not, executing the step 32, if so, controlling the third isolating switch and the second grounding isolating switch to be in an off state, otherwise, controlling the third isolating switch and the second grounding isolating switch to be off, and if so, executing the step 33; step 33: judging whether the step 32 is finished, if not, executing the step 33, and if so, controlling the first isolating switch to be closed;
step 34: judging whether the step 33 is finished, if not, executing the step 33, and if so, controlling the second isolating switch to be closed;
step 35: and judging whether the step 34 is finished, if not, executing the step 34, and if so, controlling the first breaker to be closed.
8. The unmanned power control method of claim 7, wherein the step 1 further comprises:
step 11: setting a power distribution network;
one end of the distribution network power distribution branch is connected to the main line branch, the other end of the distribution network power distribution branch is connected to a load, and the distribution network power distribution branch is used for acquiring distribution power; the power distribution branch comprises a fourth disconnecting switch, a second circuit breaker and a fifth disconnecting switch which are connected in sequence; one end of the fourth isolating switch is connected with the main branch line, the other end of the fourth isolating switch is connected with the second circuit breaker, one end of the fifth isolating switch is connected with the load, and the other end of the fifth isolating switch is connected with the second circuit breaker;
one end of the third grounding isolation disconnecting link is connected with the load input end, and the other end of the third grounding isolation disconnecting link is connected with the grounding end;
and the power distribution control center is respectively connected with the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch, and is used for controlling the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch to be disconnected and closed.
9. The unmanned operational power control method of claim 8, the method further comprising:
and 4, step 4: the power distribution branch is powered off according to a power-off maintenance method so as to facilitate maintenance; the power-off maintenance method for the power distribution branch circuit comprises the following steps:
step 41: the power distribution control center controls the second circuit breaker to be opened;
step 42: detecting whether step 41 is completed, if not, stopping execution; if the operation is finished, controlling the fifth isolating switch to be disconnected;
step 43: detecting whether the step 42 is finished, if the execution is not finished, stopping the execution, and if the step is finished, controlling the fourth isolating switch to be switched off;
step 44: detecting whether the step 43 is completed, if not, stopping the execution, if so, determining whether the load has a voltage, if so, controlling the third grounding isolation switch to be in an open state, and if not, controlling the third grounding isolation switch to be closed;
and 5: and powering on the power distribution branch according to a power-on maintenance method.
10. The unmanned operational power control method of claim 9, the method step 5 comprising:
step 51: controlling the third grounding isolation switch to be disconnected;
step 52: detecting whether the step 51 is finished, if not, stopping the operation, and if so, controlling the fourth isolating switch to be closed;
step 53: detecting whether the step 52 is finished, if not, stopping the operation, and if so, controlling the fifth isolating switch to be closed;
step 54: and detecting whether the step 53 is finished, if not, stopping the operation, and if so, controlling the second breaker to be closed.
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