CN115549041B - Unmanned electric power system and control method - Google Patents

Unmanned electric power system and control method Download PDF

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Publication number
CN115549041B
CN115549041B CN202211308344.XA CN202211308344A CN115549041B CN 115549041 B CN115549041 B CN 115549041B CN 202211308344 A CN202211308344 A CN 202211308344A CN 115549041 B CN115549041 B CN 115549041B
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China
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isolating switch
grounding
switch
circuit breaker
power distribution
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CN115549041A (en
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李强生
李丹行
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Individual
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261Sectionalised 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
    • H02H7/262Sectionalised 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit 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
    • H02J13/00004Circuit 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses an unmanned electric power system, which comprises: a main branch line input with high-voltage electricity, wherein the main branch line is connected to a power distribution network and comprises a first isolating switch, a first circuit breaker and a second isolating switch which are sequentially connected in series; the isolating switches are arranged on the main branch line, and the grounding isolating switches and the voltage transformers are arranged on the other end of the main branch line and are grounded; and the measurement and control center is connected with the bypass branch lines, the first isolating switch, the first circuit breaker and the second isolating switch, and controls the states of the first isolating switch, the first circuit breaker and the second isolating switch according to the on-off and/or detection voltage of the isolating switch, the grounding isolating switch and the voltage transformer, so that the power failure on the main circuit branch line is realized. The control method of the invention operates according to a plurality of steps, and the operation result of the last step is self-checked before each operation step, thereby preventing misoperation and ensuring operation safety.

Description

Unmanned electric power system and control method
Technical Field
The present invention relates to a power control system, and more particularly, to an unmanned power system and a control method.
Background
The supply of electric power brings civilization to human beings, and various human beings are free from the electric power requirement. At present, some personnel are required to perform on-site power cut and transmission operation in the power system management of China. The method is characterized by comprising the steps of power grid overhaul, emergency defect treatment, power grid distribution and normal power failure construction, and personnel field treatment is required. At present, the power grid of China adopts ultra-high voltage power transmission across regions, and then is transformed into high voltage or industrial voltage in cities, wherein the voltages are large, and serious safety risks exist for human bodies. In operation, once misoperation occurs, large-area power failure is caused in a large-scale power supply system, equipment and facilities are destroyed, huge economic loss is brought to the country, casualties are necessarily caused, and unfortunately, family is brought.
Disclosure of Invention
The invention aims to provide an unmanned electric power system, which aims to solve the technical problems of casualties and misoperation caused by manual operation in the prior art. The unmanned power system disclosed by the invention comprises:
the main bus and the bypass bus are provided with input high voltage;
the main circuit branch line comprises a first disconnecting switch, a first circuit breaker and a second disconnecting switch which are sequentially connected in series, wherein one end of the first disconnecting switch is connected with the main circuit bus, the other end of the first disconnecting switch is connected with the first circuit breaker, one end of the second disconnecting switch is connected with the power distribution network, and the other end of the second disconnecting 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;
the first grounding isolation disconnecting link is characterized in that 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;
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 bus;
the measurement and control center is electrically connected with the other ends of the first voltage transformer and the second voltage transformer and used for acquiring mutual inductance voltages on the first voltage transformer and the second voltage transformer;
and the measurement and control center is also in communication connection with the first isolating switch, the first circuit breaker, the second isolating switch, the third isolating switch, the first grounding isolating switch and the second grounding isolating switch and is used for receiving and controlling the control states of the first isolating switch, the first circuit breaker, the second isolating switch and the second grounding isolating switch.
In the power system, a main bus is adopted for power supply during normal operation, a bypass bus is adopted for standby power supply after the main bus is powered off, the control of the main bus is controlled by a third isolating switch which is not controlled by people, the third isolating switch is controlled to be closed by the measurement and control center under the condition that the first voltage transformer detects that the main bus is not powered, and the third isolating switch is in a normally open state under other conditions.
When the main circuit branch line is powered off, the first circuit breaker is disconnected through the measurement and control center, the second isolating switch is disconnected remotely, the self-checking is performed after the operation, then the first isolating switch is disconnected, the fact that the two ends of the first circuit breaker do not have voltage is guaranteed, after the first isolating switch and the second isolating switch are disconnected, and after the self-checking is completed, the first grounding isolating switch is closed, reverse voltage of a power distribution network can be avoided at the moment, and the safety of the main circuit branch line needing to be overhauled is guaranteed. According to the invention, each operation needs to carry out self-checking on the state of the previous operation, and the switch operation is completed by combining with a remote control measurement and control center, so that the manual operation is avoided.
The invention aims to provide an unmanned electric power control method, which aims to solve the technical problems of casualties and misoperation caused by manual operation in the prior art.
The unmanned electric power control method disclosed by the invention comprises the following steps:
step 1: setting a power system according to the above;
step 2: powering off the main branch line 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 opens the first breaker;
step 22, judging whether the step 21 is completed or not, 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 completed 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 completed 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 inductance voltage exists on the first voltage transformer or not according to the first voltage transformer, if no voltage exists, controlling the first grounding isolation disconnecting link to be closed by the measurement and control center, and executing a step 27; otherwise, go to step 26;
step 26: the measurement and control center controls the first grounding switch to be normally opened;
step 27: and judging whether the step 25 is finished or not, if not, stopping the operation, if so, detecting whether the second voltage transformer has voltage, if so, controlling the second grounding isolation disconnecting link to be in a normally-open state, and if not, controlling the second grounding isolation disconnecting link to be closed.
In the invention, unmanned operation is firstly carried out on the first circuit breaker, the main line branch is disconnected, and then the second isolating switch and the first isolating switch which are arranged in front and behind the first circuit breaker are disconnected, so that the first circuit breaker is not in a high-voltage working state; the state of the third isolating switch on the bypass bus is self-checked, so that the third isolating switch is in an off state, and no high voltage is ensured on the main branch line; detecting the voltage of the input end of a power distribution network by using a first voltage transformer, ensuring that no voltage is input to the power distribution network, and then controlling the first grounding isolation disconnecting link to be closed; the voltage on the third isolating switch and the first voltage transformer is self-checked particularly before the first grounding isolating switch is closed, so that the first grounding isolating switch is opened and cannot be grounded when the third isolating switch is closed or the voltage on the first voltage transformer is detected to be in the voltage state, and therefore power faults caused by direct grounding of high voltage are prevented; after the first grounding isolation disconnecting link is closed, the influence of the rear-end power distribution network on the voltage on the front-end main branch line can be avoided, and personnel safety is guaranteed. Finally, detecting the voltage of the main circuit bus according to a second voltage transformer, and controlling the second grounding isolation disconnecting link to be in a normally-off state when the voltage of the main circuit bus is electrified; when the main bus does not have voltage, the second grounding isolation disconnecting link is controlled to be closed, so that the line safety is ensured.
According to the control method, the first isolating switch, the first circuit breaker, the second isolating switch, the first grounding isolating switch, the second grounding isolating switch, the first voltage transformer and the second voltage transformer are operated according to a plurality of steps, the self-checking of the operation result of the previous step is needed before each operation step, misoperation is prevented, the next operation can be completed after the self-checking is completed, and therefore operation safety is guaranteed.
According to the invention, the electrical equipment is remotely controlled through the measurement and control center, so that manual operation is not needed, the occurrence of manual irregular operation is avoided, and the safety is improved.
Drawings
FIG. 1 is a schematic diagram of the electrical connections of the unmanned power system of the present invention;
fig. 2 is a schematic diagram of the electrical connection of the power distribution network of the present invention.
Detailed Description
The invention is further illustrated and described below in conjunction with the specific embodiments and the accompanying drawings:
referring to fig. 1, an unmanned power system of the present invention includes: the system comprises a main way bus, a bypass bus, a main way branch line and a measurement and control center.
Wherein, the main way bus and the bypass bus are provided with input high voltage. The high voltage is derived from an ac/dc trans-regional transmission voltage.
The main circuit branch line is used for entering a transformer substation and an internal power circuit of the transformer substation, and the transformer substation obtains power through the main circuit branch line and transmits the power to the power distribution network after power transformation, and distributes the power to each power distribution center of the city. The main branch line one end is connected to the main bus bar, the other end is connected to the power distribution network, the main branch line comprises a first disconnecting switch, a first circuit breaker and a second disconnecting switch which are sequentially connected in series, one end of the first disconnecting switch is connected with the main bus bar, the other end of the first disconnecting switch is connected with the first circuit breaker, one end of the second disconnecting switch is connected with the power distribution network, and the other end of the second disconnecting switch is connected with the first circuit breaker. In this embodiment, the first and second disconnectors are mechanical knife switches that physically close or open the main branch line, while the first circuit breaker is an electrically controlled isolation device that is electrically remote from the main branch line by internal means.
The power system further includes: the third disconnecting switch, the first grounding disconnecting switch and the second grounding disconnecting switch.
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 the power transformation power for standby, when no voltage exists on the main bus and the voltage needs to be output to the power distribution network, the third isolating switch is closed when power is ensured, and the third isolating switch is in a normally-open state under other conditions.
The first grounding isolation disconnecting link is characterized in that 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 is cut off on a branch line of a main circuit, the influence of power distribution network power on the front end is prevented from causing power accidents due to voltage reflux on the branch line of the main circuit. The first grounding isolation disconnecting link power distribution network input end is closed when no voltage exists, and at the moment, the safety of the front-end main branch line can be protected. Wherein the first grounded isolation knife is normally open when the third isolation is closed, and in other cases. Particularly, when the third isolation is closed, the first grounding isolation switch is forbidden to be grounded, and the standby high voltage from the main branch line can be directly grounded, so that circuit damage and power accidents are caused.
The power system further comprises a first voltage transformer and a second voltage transformer, wherein one end of the first voltage transformer is connected with a main bus at the input end of the power distribution network; and one end of the second voltage transformer is connected with the main 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 disconnecting link can be closed. The second voltage transformer is used for detecting whether the main bus has voltage or not, and when the main bus has voltage, the second grounding isolation disconnecting link is in a normally-off state; when no voltage exists on the main bus, the second grounding isolation disconnecting link is controlled to be closed, and the main bus can be prevented from being suddenly electrified or the reverse flow of the voltage on the main branch line can be prevented, so that the operation safety on the main branch line is ensured.
The measurement and control center is electrically connected with the other ends of the first voltage transformer and the second voltage transformer and used for acquiring mutual inductance voltages of the first voltage transformer and the second voltage transformer;
and the measurement and control center is also in communication connection with the first isolating switch, the first circuit breaker, the second isolating switch, the third isolating switch, the first grounding isolating switch and the second grounding isolating switch and is used for receiving and controlling the control states of the first isolating switch, the first circuit breaker, the second isolating switch and the second grounding isolating switch.
In this embodiment, the power failure maintenance of the main branch line is completed by the measurement and control center through remote unmanned operation of the first isolating switch, the first circuit breaker, the second isolating switch, the third isolating switch, the first grounding isolating switch and the second grounding isolating switch, and in the maintenance process, the self-detection is performed on the operation of the previous step before each operation according to the above operation process, thereby ensuring that no misoperation occurs.
Specifically, the measurement and control center controls the first isolating switch, the first circuit breaker and the second isolating switch to be opened and closed, controls the third isolating switch, the first grounding isolating switch and the second grounding isolating switch to be opened and closed according to the mutual inductance voltage of the first voltage transformer and the second voltage transformer, detects the states of the first isolating switch, the first circuit breaker, the second isolating switch, the third isolating switch, the first grounding isolating switch and the second grounding isolating switch which are opened and closed last time before each opening and closing, and performs the next operation when the operation is configured to be allowed.
Referring to fig. 2, in the present invention, the power distribution network includes: the power distribution branch, the third grounding isolation disconnecting link and the power 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 circuit comprises a fourth isolating switch, a second circuit breaker and a fifth isolating switch which are sequentially connected; one end of the fourth isolating switch is connected with the main circuit 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 connected with the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch respectively and used for controlling the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch to be opened and closed.
Further, 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 live induction tester is connected with the power distribution control center and is used for sending detection signals to the power distribution control center.
The power distribution control center controls the fourth disconnecting switch, the second circuit breaker and the fifth disconnecting switch to be opened or closed, controls the third grounding disconnecting switch to be opened or closed according to the test voltage of the live induction tester, detects the states of the fourth disconnecting switch, the second circuit breaker, the fifth disconnecting switch and the third grounding disconnecting switch which are opened or closed last time before each opening or closing, and performs the next operation when the third disconnecting switch is configured to be allowed to operate.
The invention also discloses an unmanned electric power control method. The method comprises the following steps:
step 1: the power system is set according to the above.
Step 2: powering off the main branch line 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 opens the first breaker;
step 22, judging whether the step 21 is completed or not, 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 completed 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 completed 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 inductance voltage exists on the first voltage transformer or not according to the first voltage transformer, if no voltage exists, controlling the first grounding isolation disconnecting link to be closed by the measurement and control center, and executing a step 27; otherwise, go to step 26;
step 26: the measurement and control center controls the first grounding switch to be normally opened;
step 27: judging whether the step 25 is finished, if not, stopping the operation, if so, judging whether the second voltage transformer has voltage or not, if so, controlling the second grounding isolation disconnecting link to be in a normally-open state, and if not, controlling the second grounding isolation disconnecting link to be closed;
step 3: and electrifying the main circuit branch according to an electrifying maintenance method.
Wherein, the step 3 comprises the following steps:
step 31: detecting whether the first grounding isolation disconnecting link is in a disconnection state, if not, controlling the first grounding isolation disconnecting link to be disconnected, and if so, executing a step 32;
step 32, judging whether the step 31 is completed, if not, executing the step 32, if yes, controlling the third isolating switch and the second grounding isolating switch to be in a disconnection state, otherwise, controlling the third isolating switch and the second grounding isolating switch to be disconnected, and if yes, executing the step 33; step 33: judging whether the step 32 is finished, if not, executing a 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: a determination is made as to whether step 34 is complete, if not, step 34 is performed and if so, the first circuit breaker is controlled to close.
Further, the step 1 further includes:
step 11: setting a power distribution network according to the above content;
further, the method further comprises:
step 4: powering off the power distribution branch 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 disconnected;
step 42: detecting whether step 41 is completed, such as stopping execution if not completed; if the operation is finished, the fifth isolating switch is controlled to be turned off;
step 43: detecting whether the step 42 is completed, if not, stopping execution, and if so, controlling the fourth isolating switch to be opened;
step 44: and detecting whether the step 43 is completed, if the execution is not completed, judging whether the load has voltage or not, if so, controlling the third grounding isolation disconnecting link to be in an open state, and if not, controlling the third grounding isolation disconnecting link to be closed.
Step 5: and (5) electrifying the power distribution branch according to an electrifying maintenance method.
Further, the method step 5 includes:
step 51: controlling the third grounding isolation disconnecting link 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 completed, 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 completed, if not, stopping the operation, and if so, controlling the second circuit breaker to be closed. In the invention, unmanned operation is firstly carried out on the first circuit breaker, the main line branch is disconnected, and then the second isolating switch and the first isolating switch which are arranged in front and behind the first circuit breaker are disconnected, so that the first circuit breaker is not in a long-time high-voltage working state; the state of the third isolating switch on the bypass bus is self-checked, so that the third isolating switch is in an off state, and no high voltage is ensured on the main branch line; detecting the voltage of the input end of a power distribution network by using a first voltage transformer, ensuring that no voltage is input to the power distribution network, and then controlling the first grounding isolation disconnecting link to be closed; the voltage on the third isolating switch and the first voltage transformer is self-checked particularly before the first grounding isolating switch is closed, so that the first grounding isolating switch is opened and cannot be grounded when the third isolating switch is closed or the voltage on the first voltage transformer is detected to be in the voltage state, and therefore power faults caused by direct grounding of high voltage are prevented; after the first grounding isolation disconnecting link is closed, the influence of the rear-end power distribution network on the voltage on the front-end main branch line can be avoided, and personnel safety is guaranteed. Finally, detecting the voltage of the main circuit bus according to a second voltage transformer, and controlling the second grounding isolation disconnecting link to be in a normally-off state when the voltage of the main circuit bus is electrified; when the main bus does not have voltage, the second grounding isolation disconnecting link is controlled to be closed, so that the line safety is ensured.
According to the control method, the first isolating switch, the first circuit breaker, the second isolating switch, the first/second grounding isolating switch and the first/second voltage transformer are operated according to a plurality of steps, the self-checking of the operation result of the previous step is needed before each operation step, misoperation is prevented, the next operation can be completed after the self-checking is completed, and therefore operation safety is guaranteed.
According to the invention, the electrical equipment is remotely controlled through the measurement and control center, so that manual operation is not needed, the occurrence of manual irregular operation is avoided, and the safety is improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been 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 to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (6)

1. An unmanned power system, the system comprising:
the main bus and the bypass bus are provided with input high voltage;
the main circuit branch line comprises a first disconnecting switch, a first circuit breaker and a second disconnecting switch which are sequentially connected in series, wherein one end of the first disconnecting switch is connected with the main circuit bus, the other end of the first disconnecting switch is connected with the first circuit breaker, one end of the second disconnecting switch is connected with the power distribution network, and the other end of the second disconnecting 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;
the first grounding isolation disconnecting link is characterized in that 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;
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 the 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 used for acquiring mutual inductance voltages on the first voltage transformer and the second voltage transformer;
the measurement and control center is also in communication connection with the first isolating switch, the first circuit breaker, the second isolating switch, the third isolating switch, the first grounding isolating switch and the second grounding isolating switch and is used for receiving and controlling the control states of the first isolating switch, the first circuit breaker, the second isolating switch and the second grounding isolating switch;
the measurement and control center controls the first isolating switch, the first circuit breaker and the second isolating switch to be opened and closed, controls the third isolating switch, the first grounding isolating switch and the second grounding isolating switch to be opened and closed according to the mutual inductance voltage of the first voltage transformer and the second voltage transformer, detects the states of the first isolating switch, the first circuit breaker, the second isolating switch, the third isolating switch, the first grounding isolating switch and the second grounding isolating switch which are opened and closed last time before each opening and closing, and performs the next operation when the operation is allowed;
the power distribution network includes:
a power distribution branch circuit, one end of which is connected to the main branch circuit, and the other end of which is connected to a load, wherein the power distribution branch circuit is used for acquiring power distribution; the power distribution branch circuit comprises a fourth isolating switch, a second circuit breaker and a fifth isolating switch which are sequentially connected; one end of the fourth isolating switch is connected with the main circuit 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 connected with the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch respectively and 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;
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 live induction tester is connected with the power distribution control center and is used for sending detection signals to the power distribution control center;
the power distribution control center controls the fourth disconnecting switch, the second circuit breaker and the fifth disconnecting switch to be opened or closed, controls the third grounding disconnecting switch to be opened or closed according to the test voltage of the live induction tester, detects the states of the fourth disconnecting switch, the second circuit breaker, the fifth disconnecting switch and the third grounding disconnecting switch which are opened or closed last time before each opening or closing, and performs the next operation when the states are configured to be allowed to operate.
2. An unmanned power control method, comprising the steps of:
step 1: providing a power system comprising: the main bus and the bypass bus are provided with input high voltage;
the main circuit branch line comprises a first disconnecting switch, a first circuit breaker and a second disconnecting switch which are sequentially connected in series, wherein one end of the first disconnecting switch is connected with the main circuit bus, the other end of the first disconnecting switch is connected with the first circuit breaker, one end of the second disconnecting switch is connected with the power distribution network, and the other end of the second disconnecting 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;
the first grounding isolation disconnecting link is characterized in that 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 the main circuit bus of the power distribution network input end, 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 bus, and the other end of the second voltage transformer is connected with the grounding end;
the measurement and control center is electrically connected with the first voltage transformer and the second voltage transformer and used for acquiring mutual inductance voltages of the first voltage transformer and the second voltage transformer;
the measurement and control center is also in communication connection with the first isolating switch, the first circuit breaker, the second isolating switch, the third isolating switch, the first grounding isolating switch and the second grounding isolating switch;
step 2: powering off the main branch line 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 opens the first breaker;
step 22, judging whether the step 21 is completed or not, 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 completed 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 completed 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 inductance voltage exists on the first voltage transformer or not according to the first voltage transformer, if no voltage exists, controlling the first grounding isolation disconnecting link to be closed by the measurement and control center, and executing a step 27; otherwise, go to step 26;
step 26: the measurement and control center controls the first grounding switch to be normally opened;
step 27: and judging whether the step 25 is finished or not, if not, stopping the operation, if so, detecting whether the second voltage transformer has voltage, if so, controlling the second grounding isolation disconnecting link to be in a normally-open state, and if not, controlling the second grounding isolation disconnecting link to be closed.
3. The unmanned electric power control method according to claim 2, further comprising:
step 3: powering up the main branch according to a power-up maintenance method;
the step 3 comprises the following steps:
step 31: detecting whether the first grounding isolation disconnecting link is in a disconnection state, if not, controlling the first grounding isolation disconnecting link to be disconnected, and if so, executing a step 32;
step 32, judging whether the step 31 is completed, if not, executing the step 32, if yes, controlling the third isolating switch and the second grounding isolating switch to be in a disconnection state, otherwise, controlling the third isolating switch and the second grounding isolating switch to be disconnected, and if yes, executing the step 33; step 33: judging whether the step 32 is finished, if not, executing a 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: a determination is made as to whether step 34 is complete, if not, step 34 is performed and if so, the first circuit breaker is controlled to close.
4. The unmanned electric power control method according to claim 3, wherein the step 1 further comprises:
step 11: setting a power distribution network;
the power distribution network power distribution branch circuit is connected with the main branch circuit at one end and the load at the other end, and is used for acquiring power distribution power; the power distribution branch circuit comprises a fourth isolating switch, a second circuit breaker and a fifth isolating switch which are sequentially connected; one end of the fourth isolating switch is connected with the main circuit 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 connected with the fourth isolating switch, the second circuit breaker, the fifth isolating switch and the third grounding isolating switch respectively and 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.
5. The unmanned power control method of claim 4, wherein the method further comprises:
step 4: powering off the power distribution branch 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 disconnected;
step 42: detecting whether step 41 is completed, such as stopping execution if not completed; if the operation is finished, the fifth isolating switch is controlled to be turned off;
step 43: detecting whether the step 42 is completed, if not, stopping execution, and if so, controlling the fourth isolating switch to be opened;
step 44: detecting whether the step 43 is completed, if the execution is not completed, judging whether the load has voltage or not, if so, controlling the third grounding isolation disconnecting link to be in an open state, and if not, controlling the third grounding isolation disconnecting link to be closed; step 5: and (5) electrifying the power distribution branch according to an electrifying maintenance method.
6. The unmanned electric power control method according to claim 5, wherein the method step 5 comprises:
step 51: controlling the third grounding isolation disconnecting link 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 completed, 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 completed, if not, stopping the operation, and if so, controlling the second circuit breaker to be closed.
CN202211308344.XA 2022-10-25 2022-10-25 Unmanned electric power system and control method Active CN115549041B (en)

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CN215733486U (en) * 2021-06-16 2022-02-01 中国电建集团华东勘测设计研究院有限公司 Main transformer high-voltage side circuit breaker control system suitable for offshore converter station access

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