CN111049056A - Novel system for monitoring ground wire of power grid and realizing power transmission locking of circuit breaker - Google Patents
Novel system for monitoring ground wire of power grid and realizing power transmission locking of circuit breaker Download PDFInfo
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- CN111049056A CN111049056A CN201911408932.9A CN201911408932A CN111049056A CN 111049056 A CN111049056 A CN 111049056A CN 201911408932 A CN201911408932 A CN 201911408932A CN 111049056 A CN111049056 A CN 111049056A
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- grounding
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- power transmission
- power supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
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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
Abstract
The invention provides a novel system for monitoring a grounding wire of a power grid and realizing power transmission locking of a circuit breaker, which comprises a front-end grounding and signal monitoring device and a rear-end signal receiving and locking power transmission device which are communicated with each other; when the front-end grounding and signal monitoring device locks the power branch or bus to be overhauled, the power branch or bus to be overhauled can form a grounding state, and a front-end grounding signal is generated and sent to the rear-end signal receiving and locking power transmission device; when the power branch or bus to be overhauled is loosened, the grounding state formed by the power branch or bus to be overhauled can be automatically removed; after the rear-end signal receiving and locking power transmission device receives the front-end grounding signal, the electric connection between a closing control loop on the circuit breaker and an external power supply is automatically cut off, and the power transmission locking of the circuit breaker is realized. By implementing the invention, the power transmission accident with the temporary working grounding wire can be fundamentally solved, and the operation safety of the power grid is improved.
Description
Technical Field
The invention relates to the technical field of power line ground protection, in particular to a novel system for monitoring a ground wire of a power grid and realizing power transmission locking of a circuit breaker.
Background
In the maintenance work of the power branch or the bus, in order to prevent dangerous hidden dangers such as human body electric shock casualty accidents caused by power transmission of a circuit breaker which is switched on by mistake in an opposite side transformer substation or a local side transformer substation and induced electric shock, before the maintenance work, grounding disconnecting links (such as 1DG and 2DG shown in figure 1) are connected or temporary working grounding wires (such as 1 grounding wire and 2 grounding wire shown in figure 1) are additionally arranged.
Generally, the grounding disconnecting link is provided with a monitoring contact connected to a background computer display system, so that a remote dispatcher can observe the opening and closing states of all grounding disconnecting links, and a malignant misoperation event of power transmission of the grounding disconnecting link in a closed state can be avoided.
On the one hand, however, the removal condition of the additionally-installed temporary working grounding wire cannot be accurately judged, and particularly, remote dispatching and substation (power plant) personnel cannot confirm the removal condition of the temporary working grounding wire in remote mountain line maintenance or feeder line maintenance work of 10kV users. For example, as shown in fig. 2, a branch line 1 of a power supply station 10kV cable on the east side of the cable is modified in case of power failure, and after a field operator operates the cable on the east side and the branch line 1 has power failure, a group of temporary working grounding wires (for example, grounding wire No. 1) are installed on a #10 pole of the cable on the east side of the cable on the 10 kV. The construction personnel of the transformation construction contract unit transact work tickets as required, and a group of temporary work grounding wires (No. 2 grounding wires and No. 3 grounding wires respectively) are respectively arranged on two sides of a working place of a branch wire 1 of a 10kV east-Jia lateral line, namely a #11 rod and a #12 rod, and three groups of grounding wires are arranged together. After the reconstruction construction is finished on the same day, the reconstruction engineering contract unit constructor removes two groups of temporary working grounding wires of No. 2 and No. 3 which are responsible for installation, and then transacts the reconstruction working finishing procedure of the branch wire 1 of the Jiadong side wire of the 10kV first wire. After several hours, the power supply bureau duty-shift dispatcher turns the branch line 1 of the east-A lateral line of the 10kV A line into the running state for maintenance. In the case that the east line G1 disconnecting link of the 10kV first line is in a maintenance transfer state, under the condition that No. 1 temporary working grounding wire is not monitored and removed, the G1 disconnecting link is closed and reports that the G1 disconnecting link is closed to a duty dispatching dispatcher, and a 10kV first line breaker 1DL is closed when the order is waited, so that a malignant misoperation event of power transmission with the No. 1 temporary working grounding wire occurs.
On the other hand, the existing circuit breaker closing control circuit (as shown in fig. 3) cannot forcibly disconnect the power supply for locking, so that accidents such as power transmission with an additional temporary working grounding wire occur occasionally, and power grid accidents are caused. The working principle of the existing circuit breaker closing control circuit is that the switch KK is arranged in a closing position, a positive end (+ DC) of an external power supply passes through the switch KK, a resistor R1 and the relay SHJ is electrically conducted to a negative end (-DC), so that the relay SHJ is excited, a normally open contact SHJ-1 of the relay is closed, and at the moment, the positive end (+ DC) of the external power supply passes through the resistor R2 again, the circuit breaker closing coil HQ is electrically conducted to the negative end (-DC), the circuit breaker closing coil HQ is excited, the circuit breaker closing power transmission is realized, and therefore the circuit breaker closing control circuit cannot be forcibly disconnected to lock the power supply.
Therefore, the problem that the condition can not be accurately judged to the above-mentioned temporary work earth connection that installs additional demolishs, leads to taking the accident such as temporary work earth connection power transmission that installs additional occasionally to take, needs a system that monitors and realizes circuit breaker power transmission shutting voluntarily to ground wire temporary additional installation urgently, can fundamentally solve the area and install temporary work earth connection power transmission accident additional, has improved electric wire netting operation safety.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a system for monitoring a novel grounding wire of a power grid and realizing power transmission locking of a circuit breaker, which can fundamentally solve the power transmission accident caused by additionally installing a temporary working grounding wire and improve the operation safety of the power grid.
In order to solve the technical problem, an embodiment of the present invention provides a system for monitoring a novel ground wire of a power grid and locking a power transmission of a circuit breaker, including a front-end ground and signal monitoring device and a rear-end signal receiving and locking power transmission device, which are in communication with each other; wherein the content of the first and second substances,
one end of the front-end grounding and signal monitoring device is matched with a power branch line or a bus to be overhauled, and the other end of the front-end grounding and signal monitoring device is connected with the input end of the rear-end signal receiving locking power transmission device in a wireless mode and used for enabling the power branch line or the bus to be overhauled to form a grounding state when the power branch line or the bus to be overhauled is locked, generating a front-end grounding signal and transmitting the front-end grounding signal to the rear-end signal receiving locking power transmission device; when the power branch or bus to be overhauled is loosened, the grounding state formed by the power branch or bus to be overhauled can be automatically removed;
the output end of the rear-end signal receiving and locking power transmission device is connected in series between a switching-on control loop on a circuit breaker which controls power transmission and corresponds to the power branch or bus to be overhauled and an external power supply, and the rear-end signal receiving and locking power transmission device is used for automatically cutting off the electric connection between the switching-on control loop on the circuit breaker and the external power supply after receiving a front-end grounding signal generated by the front-end grounding and signal monitoring device, so that the circuit breaker can not be switched on to realize power transmission locking.
The front-end grounding and signal monitoring device comprises a fastening chuck, an adjusting mechanism, a fastening rod, a grounding wire, a micro-motion triggering mechanism and a signal transmitting box; wherein the content of the first and second substances,
the two ends of the fastening chuck are bent oppositely and locked into a ring shape through a fastening piece, and a space for accommodating the power branch line or the bus to be overhauled to pass through is formed inside the ring of the fastening chuck;
the adjusting mechanism comprises an insulating part and a metal conducting part; the bottom end of the insulating part is sleeved on the top end of the fastening rod and is in rotating fit with the top end of the fastening rod to realize height adjustment, and the top end of the insulating part is connected with the bottom end of the metal conductive part; the top end of the metal conductive part sequentially penetrates through the outer ring wall and the inner ring wall of the fastening chuck and is positioned in a space formed by the fastening chuck and used for accommodating the electric branch line or the bus to be overhauled, and the grounding line is connected between the two ends of the metal conductive part;
the bottom end of the fastening rod is fixed on the ground;
one end of the grounding wire, which is far away from the adjusting mechanism, is grounded;
the micro-motion trigger mechanism is arranged on the inner wall of the ring of the fastening chuck, is opposite to the metal conductive part of the adjusting mechanism, and comprises a bottom plate, two conductive contacts, a spring, a pressing plate, a contact and a metal conductive plate; the two conductive contacts are arranged on the bottom plate and are connected with the signal transmitting box through corresponding wires; two ends of the spring are respectively fixed on the bottom plate and the pressing plate; the contact is arranged on one side of the pressing plate away from the bottom plate, and a metal conducting strip matched with the two conducting contacts is formed on the side surface of one side of the pressing plate facing the bottom;
the signal transmitting box is arranged on the outer wall of the ring of the fastening chuck, and a first power supply and a signal transmitting circuit board are arranged in the signal transmitting box; the first power supply and the signal transmitting circuit board are connected into a loop by two leads connected with two conductive contacts on the micro-motion trigger mechanism; the signal transmitting circuit board is also connected with the input end of the rear end signal receiving locking power transmission device in a wireless mode, and generates and transmits a front end grounding signal when a loop formed by the signal transmitting circuit board and the first power supply is electrically conducted;
when the adjusting mechanism is adjusted to move towards the micro-motion triggering mechanism to a first position to lock the to-be-overhauled power branch or bus, the to-be-overhauled power branch or bus can form a grounding state, a contact on the micro-motion triggering mechanism drives a pressing plate to extrude a spring, and a metal conducting plate of an upper pressing plate of the micro-motion triggering mechanism is driven to be abutted against two conducting contacts of a bottom plate to realize that a first power supply in a signal transmitting box supplies power to the signal transmitting circuit board, so that the signal transmitting circuit board generates a front-end grounding signal and transmits the signal to an input end of a rear-end signal receiving locking power transmission device; or
When the adjusting mechanism moves to a second position far away from the micro-motion triggering mechanism to loosen the power branch line or the bus to be overhauled, the grounding state formed by the power branch line or the bus to be overhauled can be automatically removed, and the spring on the micro-motion triggering mechanism automatically recovers to drive the metal conducting strip of the upper pressing plate of the micro-motion triggering mechanism to be separated from the two conducting contacts of the bottom plate to realize the power failure between the first power supply and the signal transmitting circuit board in the signal transmitting box, so that the signal transmitting circuit board can not generate a front end grounding signal.
The signal transmitting circuit board is integrated with a signal transmitting circuit; wherein the content of the first and second substances,
the signal transmitting circuit comprises a first relay, a first indicator light and a signal transmitter; the coil control end is connected with the first indicator light in series and then connected with the first power supply through two wires connected with the two conductive contacts on the micro-motion trigger mechanism to form a loop, and the normally open contact is connected with the signal transmitter in series and then connected with the first power supply through two wires connected with the two conductive contacts on the micro-motion trigger mechanism to form another loop.
The signal transmitter comprises a baseband chip for generating a front-end grounding signal and a signal transmitter chip; one end of the signal transmitter chip is connected with the baseband chip, and the other end of the signal transmitter chip is connected with the input end of the rear-end signal receiving locking power transmission device in a wireless mode.
The bottom end of the insulating part on the adjusting mechanism is in threaded connection with the top end of the fastening rod, and the length of the bottom end of the insulating part on the adjusting mechanism can be adjusted; wherein, be formed with the internal thread on the bottom inner wall of insulating part, be formed into the external screw thread on the top outer wall of fastening rod.
The top end of the insulating part on the adjusting mechanism is detachably mounted with the bottom end of the metal conducting part.
Wherein, a supporting frame is formed at the top end of the metal conductive part; wherein, the support frame is a concave arc.
The fastening chuck is made of insulating materials, two ends of the fastening chuck are bent oppositely, and the two ends of the fastening chuck are locked into a ring shape through a clamp or a bolt.
The rear-end signal receiving, locking and power transmitting device comprises a signal receiver, an operational amplification chip, a light-emitting triode, an optocoupler, a second relay, a second indicator light and a second power supply; wherein the content of the first and second substances,
a positive power supply end, a negative power supply end, a signal receiving end and a signal output end are formed on the signal receiver; a positive electricity pin, a negative electricity pin, a level signal input end and a level signal output end are formed on the operational amplification chip; a coil control end and a normally closed contact are formed on the second relay;
a positive power supply end and a negative power supply end of the signal receiver are respectively and correspondingly connected with the positive electrode and the negative electrode of the second power supply, a signal receiving end is connected with a signal transmitting box on the front-end grounding and signal monitoring device in a wireless mode, and a signal output end is connected with a level signal input end of the operational amplification chip;
the positive electrode pin and the negative electrode pin of the operational amplification chip are respectively and correspondingly connected with the positive electrode and the negative electrode of the second power supply, and the level signal output end of the operational amplification chip is connected with the base electrode of the light-emitting triode;
the collector of the light emitting triode is connected with the anode of the second power supply, and the emitter of the light emitting triode is connected with the cathode of the second power supply;
the optocoupler, a coil control end of the second relay, the second indicator light and the second power supply are connected in series to form a loop, the optocoupler is arranged close to the light-emitting triode, and the second indicator light is arranged far away from the optocoupler;
the normally closed contact on the second relay is connected in series between a closing control loop on a circuit breaker which controls power transmission corresponding to the power branch or bus to be overhauled and an external power supply;
after the signal receiver receives a front end grounding signal of a signal transmitting box on the front end grounding and signal monitoring device, the operational amplification chip generates a high level signal to drive the light emitting triode to emit light, the optocoupler is driven to be connected with a loop of a coil control end of the second relay, the second indicator light and the second power supply in series, and a normally closed contact of the second relay is opened to cut off connection between a closing control loop on the circuit breaker and an external power supply.
The normally closed contact of the second relay is arranged on a connecting line between a closing control loop on the circuit breaker and an external power supply; or the switch-on control circuit is arranged on a connecting line of the switch-on control circuit on the circuit breaker.
The embodiment of the invention has the following beneficial effects:
when the front end grounding and signal monitoring device locks the power branch or bus to be overhauled, the power branch or bus to be overhauled forms a grounding state and generates a front end grounding signal, the rear end signal receiving and locking power transmission device automatically cuts off the electric connection between a switching-on control loop on the circuit breaker and an external power supply after receiving the front end grounding signal, so that the circuit breaker cannot be switched on to realize power transmission locking, when the front end grounding and signal monitoring device loosens the power branch or bus to be overhauled, the grounding state formed by the power branch or bus to be overhauled is automatically removed and cannot generate a front end grounding signal, the rear end signal receiving and locking power transmission device cannot automatically cut off the electric connection between the switching-on control loop on the circuit breaker and the external power supply after receiving the front end grounding signal, so that the circuit breaker can carry out switching-on and power transmission operation, thereby the temporary additional monitoring on a grounding wire and the automatic power transmission locking, fundamentally solves the area and installs the power transmission accident of earthing for work line additional, has improved the electric wire netting operation safety.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic diagram illustrating connection between a grounding switch and a temporary grounding wire during maintenance of a power branch or a bus in the prior art;
FIG. 2 is a view of an application scenario in which multiple groups of temporary grounding wires are additionally installed during maintenance of power branch wires or buses in the prior art;
fig. 3 is a logic diagram of a closing control loop of a circuit breaker for controlling power transmission during maintenance of a power branch or a bus in the prior art;
fig. 4 is a block diagram of a system for monitoring a novel ground wire of a power grid and implementing power transmission locking of a circuit breaker according to an embodiment of the present invention;
fig. 5 is a schematic physical structure diagram of a front-end grounding and signal monitoring device in a system for monitoring a novel ground wire of a power grid and realizing power transmission locking of a circuit breaker according to an embodiment of the present invention;
FIG. 6 is a block diagram of the structure between the micro-motion triggering mechanism and the signal transmitting box of the front-end grounding and signal monitoring device in FIG. 5;
FIG. 7 is a block diagram of a signal transmitting circuit board in the signal transmitting box of FIG. 6;
FIG. 8 is a schematic diagram of the logic circuit connections of FIG. 6;
fig. 9 is a block diagram of the rear-end signal receiving and locking power transmission device in fig. 5;
fig. 10 is a schematic diagram of the logic circuit of fig. 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 4, a system for monitoring a novel ground wire of a power grid and locking a power transmission of a circuit breaker according to an embodiment of the present invention includes a front-end ground and signal monitoring device 1 and a back-end signal receiving and locking power transmission device 2, which are in communication with each other; wherein the content of the first and second substances,
one end of the front-end grounding and signal monitoring device 1 is matched with a power branch line or a bus to be overhauled, and the other end of the front-end grounding and signal monitoring device 1 is connected with the input end of the rear-end signal receiving locking power transmission device in a wireless mode (such as zigbee, 4G/5G, WIFI, Bluetooth and the like), so that when the power branch line or the bus to be overhauled is locked, the power branch line or the bus to be overhauled can form a grounding state, a front-end grounding signal is generated and sent to the rear-end signal receiving locking power transmission device 2; when the power branch or bus to be overhauled is loosened, the grounding state formed by the power branch or bus to be overhauled can be automatically removed, and certainly, a front-end grounding signal cannot be generated at the moment;
the output end of the rear end signal receiving and locking power transmission device 2 is connected in series between a switching-on control loop on a circuit breaker which controls power transmission and corresponds to a power branch line or a bus to be overhauled and an external power supply, and is used for automatically cutting off the electric connection between the switching-on control loop on the circuit breaker and the external power supply after receiving a front end grounding signal generated by the front end grounding and signal monitoring device 1, so that the circuit breaker can not be switched on to realize power transmission locking.
It should be noted that, a schematic diagram of connection between a closing control loop on the circuit breaker and an external power source can be referred to as shown in fig. 3. At this time, the output end of the rear-end signal receiving and locking power transmission device 2 may be used as a switch between the closing control circuit on the circuit breaker and the external power supply, and the electrical connection between the closing control circuit on the circuit breaker and the external power supply is switched on or off by controlling the on/off state.
It can be understood that there are various designs of signals between the front-end grounding and signal monitoring device 1 and the rear-end signal receiving and locking power transmission device 2, such as infrared signals; meanwhile, the structures of the front-end grounding and signal monitoring device 1 and the rear-end signal receiving and locking power transmission device 2 can be designed simply and can also be designed in a complicated mode.
In one embodiment, the front-end grounding and signal monitoring device 1 comprises a winding belt, a grounding wire and an infrared trigger, wherein once the winding belt is tightly wound on a power branch line or a power bus line to be overhauled, the grounding wire is grounded, and the infrared trigger generates an infrared signal; the rear end signal receiving and locking power transmission device 2 comprises an infrared receiver and an intermediate relay (or a signal trigger switch), and once the infrared receiver receives the infrared signal of the front end grounding and signal monitoring device 1, the intermediate relay is enabled to excite a normally closed contact to be opened (or the signal trigger switch is triggered to be opened) to cut off the electric connection between a closing control circuit on the circuit breaker and an external power supply.
In another embodiment, the front-end grounding and signal monitoring device 1 and the rear-end signal receiving and locking power transmission device 2 adopt a complicated design, as shown in fig. 5 to 10, specifically as follows:
(1) the front end grounding and signal monitoring device comprises a fastening chuck a1, an adjusting mechanism a2, a fastening rod a3, a grounding wire a4, a micro-motion triggering mechanism a5 and a signal transmitting box a6 (shown in FIG. 5); wherein the content of the first and second substances,
the fastening chuck a1 is made of an insulating material (e.g., plastic such as PVC, PVE, etc.), both ends are bent relatively and locked in a ring shape by fasteners (clips, bolts, etc.) on both ends thereof, and a space for accommodating a power branch or bus T (e.g., a line with an arrow in fig. 5, where DL denotes a circuit breaker) to be repaired to pass therethrough is formed inside the ring of the fastening chuck a 1;
the adjusting mechanism a2 comprises an insulating part a21 (such as a hard plastic rod) and a metal conductive part a22 (such as a metal long rod bolt); the bottom end of the insulating part a21 is sleeved on the top end of the fastening rod a3 and is in rotating fit with the top end of the fastening rod a3 to realize height adjustment, and the top end of the insulating part a21 is connected with the bottom end of the metal conductive part a 22; the top end of the metal conductive part a22 sequentially passes through the ring outer wall and the ring inner wall of the fastening chuck a1 and is positioned in a space formed by the fastening chuck a1 and used for accommodating a power branch line or a bus T to be overhauled, and a grounding line a4 is connected between two ends of the metal conductive part a 22; the top end of the metal conductive part a22 is formed with a support frame a221, and the support frame a221 is a concave arc (such as a half-crescent), which is beneficial to the placement of the power branch or bus T to be repaired so as not to slide. In one example, the bottom end of the insulating part a21 on the adjusting mechanism a2 is in threaded connection with the top end of the fastening rod a3, and the length of the threaded connection can be adjusted; an internal thread is formed on the inner wall of the bottom end of the insulating part a21, an external thread is formed on the outer wall of the top end of the fastening rod a3, and at the moment, height adjustment is achieved by adjusting the length of threaded connection, so that the metal conductive part a22 moves towards or away from the micro-motion trigger mechanism a 5; the top end of the insulating part a21 and the bottom end of the metal conducting part a22 are detachably mounted together, so that the operations of mounting, dismounting, maintenance, replacement and the like are facilitated;
the bottom end of the fastening rod a3 (such as solid wood, hard plastic rod, etc.) is fixed on the ground;
one end of the grounding wire a4 far away from the adjusting mechanism a2 is grounded, so that the power branch or bus T to be overhauled is in a grounding state through the metal conductive part a 22;
the micro-motion trigger mechanism a5 is mounted on the ring inner wall of the fastening chuck a1 and is arranged opposite to the metal conducting part a22 of the adjusting mechanism a2, and comprises a bottom plate a51, two conducting contacts a52, a spring a53, a pressing plate a54, a contact a55 and a metal conducting plate a56 (shown in fig. 6); the two conductive contacts a52 are both arranged on the bottom plate a51 and are connected with the signal transmitting box a6 through corresponding leads L; two ends of the spring a53 are respectively fixed on the bottom plate a51 and the pressure plate a 54; a contact a55 is arranged on the side of the pressure plate a54 away from the bottom plate a51, and a metal conducting strip a56 matched with the two conducting contacts a52 is formed on the side of the pressure plate a54 facing the bottom plate a 51;
the signal transmitting box a6 is mounted on the outer wall of the ring of the fastening chuck a1, and a first power supply a61 (rechargeable battery) and a signal transmitting circuit board a62 (shown in fig. 6) are arranged inside the signal transmitting box a 6; wherein, the first power a61 and the signal transmitting circuit board a62 are connected by two leads L which are connected with two conductive contacts a52 on the micro-motion trigger mechanism a5 to form a loop; the signal transmitting circuit board a62 is also wirelessly connected with the input end of the rear signal receiving and locking power transmission device 2, and generates and transmits a front grounding signal when the circuit formed by the first power supply a61 is electrically conducted;
when the adjusting mechanism a2 moves towards the micro-motion triggering mechanism a5 to a first position to lock the power branch or bus T to be overhauled, the power branch or bus T to be overhauled can be grounded, the contact a55 on the micro-motion triggering mechanism a5 drives the pressing plate a54 to extrude the spring a53, the metal conducting plate a56 of the pressing plate a54 on the micro-motion triggering mechanism a5 is driven to be pressed against the two conducting contacts a52 of the bottom plate a51, so that the first power supply a61 in the signal transmitting box a6 supplies power to the signal transmitting circuit board a62, and the signal transmitting circuit board a62 generates a front-end grounding signal and transmits the signal to the input end of the rear-end signal receiving and locking power transmission device 2; or
When the adjusting mechanism a2 moves away from the micro-motion triggering mechanism a5 to the second position to loosen the power branch or bus T to be overhauled, the grounding state formed by the power branch or bus T to be overhauled can be automatically removed, and the spring a53 on the micro-motion triggering mechanism a5 automatically recovers to drive the metal conducting sheet a56 of the pressing plate a54 on the micro-motion triggering mechanism a5 to be separated from the two conducting contacts a52 of the bottom plate a51, so that the power failure between the first power supply a61 and the signal transmitting circuit board a62 in the signal transmitting box a6 is realized, and the signal transmitting circuit board a62 cannot generate a front-end grounding signal.
It should be noted that the top end (or top portion) and the bottom end (or bottom portion) are all ground-referenced objects, and the direction toward the ground is the bottom end (or bottom portion), and the direction away from the ground is the top end (or top portion).
Further, a signal transmitting circuit is integrated on the signal transmitting circuit board a 62; wherein, the signal transmitting circuit comprises a first relay a621, a first indicator light a622 and a signal transmitter a623 (shown in fig. 7); the first relay a621 is formed with a coil control end ZJ1 and a normally open contact ZJ-1, the coil control end ZJ1 is connected with the first indicator light a622 in series and then connected with the first power a61 through two wires L connecting two conductive contacts on the micro-motion trigger mechanism to form a loop, and the normally open contact ZJ-1 is connected with the signal emitter a623 in series and then connected with the first power a61 through two wires L connecting two conductive contacts on the micro-motion trigger mechanism to form another loop; the signal emitter a623 comprises a baseband chip a6231 for generating a front-end grounding signal and a signal emitter chip a 6232; one end of the signal transmitter chip a6232 is connected to the baseband chip a6231, and the other end is wirelessly connected to the input end of the rear-end signal receiving/locking power transmission device 2.
As shown in fig. 8, a schematic diagram of logical structure connection between the micro-motion trigger mechanism a5 and the signal emission box a6 is shown, wherein a first power supply a61 is installed on the battery ④, the relay ZJ1 is a coil control end of the first relay a621, ZJ1-1 is a normally open contact of the first relay a621, XL series chips are base band chips a6231 and signal transmitter chips are signal transmitter chips a 6232. the logical structure operates on the principle that when a power branch or bus to be overhauled is locked, the contact a56 of the micro-motion trigger mechanism is pressed back to contract the spring a54, and two conductive contacts a52 are shorted through a metal conductive sheet a56, at this time, a positive electricity sent by the positive pole of the first power supply a61 is sent through an LED lamp (indicating the first indicator lamp a622), two conductive contacts a52 shorted by the micro-motion trigger mechanism a5, two conductive wires L, a resistor R5, ZJ1 coil to the negative pole of the first power supply a61, at this time, a resistor ZJ1, a resistor R1, R595, a switch contacts R595, a switch off the normally open the relay, and a switch makes the relay release the power to switch, when a signal emitter 849, a switch, a.
(2) The rear end signal receiving and locking power transmission device 2 comprises a signal receiver b1, an operational amplifier chip b2, a light emitting triode b3, an optical coupler b4, a second relay b5, a second indicator light b6 and a second power supply b7 (rechargeable battery) (as shown in fig. 9); wherein the content of the first and second substances,
a positive power supply end, a negative power supply end, a signal receiving end and a signal output end are formed on the signal receiver b 1; a positive pin, a negative pin, a level signal input end and a level signal output end are formed on the operational amplification chip b 2; a coil control end ZJ2 and a normally closed contact ZJ2-1 are formed on the second relay b 5;
a positive power supply end and a negative power supply end of the signal receiver b1 are respectively and correspondingly connected with the positive electrode and the negative electrode of the second power supply b7, a signal receiving end is connected with a signal transmitting box a6 on the front-end grounding and signal monitoring device 1 in a wireless mode, and a signal output end is connected with a level signal input end of the operational amplification chip b 2;
a positive electrode pin and a negative electrode pin of the operational amplification chip B2 are respectively and correspondingly connected with the positive electrode and the negative electrode of the second power supply B7, and the level signal output end of the operational amplification chip B2 is connected with the base electrode B of the light-emitting triode B3;
a collector C of the light emitting transistor b3 is connected with the anode of the second power supply b7, and an emitter E is connected with the cathode of the second power supply b 7;
the optical coupler b4, a coil control end ZJ2 of a second relay b5, a second indicator light b6 and a second power supply b7 are connected in series to form a loop, the optical coupler b4 is arranged close to the light-emitting triode b3, and the second indicator light b6 is arranged far away from the optical coupler b 4;
a normally closed contact ZJ2-1 on the second relay b5 is connected in series between a closing control loop on a breaker which controls power transmission corresponding to a power branch or bus to be overhauled and an external power supply; the normally closed contact ZJ2-1 on the second relay b5 is arranged on a connecting line between a closing control loop on the circuit breaker and an external power supply; or the switch-on control circuit is arranged on a connecting line of the switch-on control circuit on the circuit breaker;
after the signal receiver b1 receives a front-end grounding signal of the signal transmitting box a6 on the front-end grounding and signal monitoring device 1, the operational amplifier chip b2 generates a high-level signal to drive the light emitting triode b3 to emit light, and a loop formed by connecting the driving optocoupler b4 and the coil control end ZJ2 of the second relay b5 in series, the second indicator light b6 and the second power supply b7 is turned on, so that the normally closed contact ZJ2-1 of the second relay b5 is opened to cut off the connection between the closing control loop on the circuit breaker and the external power supply.
As shown in fig. 10, a schematic diagram of logical structure connection inside the rear-end signal receiving latching power transmission device is shown, wherein a second power supply b7 is installed on a battery ④, a relay ZJ2 is a coil control end of a second relay b5, ZJ2-1 is a normally closed contact of a second relay b5, an LM series chip is an operational amplifier chip b2, a receiver chip is a signal receiver b1, T is a light emitting triode b3, an LED is a second indicator lamp b6, and an optical coupler is an optical coupler b4, at this time, a normally closed contact ZJ2-1 on the second relay b5 is arranged on a connection line of a closing control circuit on a circuit breaker (between a short-connection hole a and a short-connection hole b in fig. 10), the working principle of the logical structure is that the receiver chip receives a front-end grounding signal of a signal transmitting box a6 on a signal monitoring device 1, the front-end grounding signal is amplified through the LM series chip and the light emitting triode T, a locking relay 2 is turned on, the ZJ is turned on the circuit, the front-end grounding connection point of the optical coupler is used for connecting a normally closed relay 2, and the circuit breaker is used for preventing a switching off a circuit breaker with an external DC circuit breaker (a circuit breaker) for preventing a switching on a switching off problem of an electrical fault.
The embodiment of the invention has the following beneficial effects:
when the front end grounding and signal monitoring device locks the power branch or bus to be overhauled, the power branch or bus to be overhauled forms a grounding state and generates a front end grounding signal, the rear end signal receiving and locking power transmission device automatically cuts off the electric connection between a switching-on control loop on the circuit breaker and an external power supply after receiving the front end grounding signal, so that the circuit breaker cannot be switched on to realize power transmission locking, when the front end grounding and signal monitoring device loosens the power branch or bus to be overhauled, the grounding state formed by the power branch or bus to be overhauled is automatically removed and cannot generate a front end grounding signal, the rear end signal receiving and locking power transmission device cannot automatically cut off the electric connection between the switching-on control loop on the circuit breaker and the external power supply after receiving the front end grounding signal, so that the circuit breaker can carry out switching-on and power transmission operation, thereby the temporary additional monitoring on a grounding wire and the automatic power transmission locking, fundamentally solves the area and installs the power transmission accident of earthing for work line additional, has improved the electric wire netting operation safety.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A novel system for monitoring a grounding wire of a power grid and realizing power transmission locking of a circuit breaker is characterized by comprising a front-end grounding and signal monitoring device and a rear-end signal receiving and locking power transmission device which are communicated with each other; wherein the content of the first and second substances,
one end of the front-end grounding and signal monitoring device is matched with a power branch line or a bus to be overhauled, and the other end of the front-end grounding and signal monitoring device is connected with the input end of the rear-end signal receiving locking power transmission device in a wireless mode and used for enabling the power branch line or the bus to be overhauled to form a grounding state when the power branch line or the bus to be overhauled is locked, generating a front-end grounding signal and transmitting the front-end grounding signal to the rear-end signal receiving locking power transmission device; when the power branch or bus to be overhauled is loosened, the grounding state formed by the power branch or bus to be overhauled can be automatically removed;
the output end of the rear-end signal receiving and locking power transmission device is connected in series between a switching-on control loop on a circuit breaker which controls power transmission and corresponds to the power branch or bus to be overhauled and an external power supply, and the rear-end signal receiving and locking power transmission device is used for automatically cutting off the electric connection between the switching-on control loop on the circuit breaker and the external power supply after receiving a front-end grounding signal generated by the front-end grounding and signal monitoring device, so that the circuit breaker can not be switched on to realize power transmission locking.
2. The system for monitoring the novel grounding wire of the power grid and realizing the power transmission locking of the circuit breaker according to claim 1, wherein the front-end grounding and signal monitoring device comprises a fastening chuck, an adjusting mechanism, a fastening rod, a grounding wire, a micro-motion triggering mechanism and a signal transmitting box; wherein the content of the first and second substances,
the two ends of the fastening chuck are bent oppositely and locked into a ring shape through a fastening piece, and a space for accommodating the power branch line or the bus to be overhauled to pass through is formed inside the ring of the fastening chuck;
the adjusting mechanism comprises an insulating part and a metal conducting part; the bottom end of the insulating part is sleeved on the top end of the fastening rod and is in rotating fit with the top end of the fastening rod to realize height adjustment, and the top end of the insulating part is connected with the bottom end of the metal conductive part; the top end of the metal conductive part sequentially penetrates through the outer ring wall and the inner ring wall of the fastening chuck and is positioned in a space formed by the fastening chuck and used for accommodating the electric branch line or the bus to be overhauled, and the grounding line is connected between the two ends of the metal conductive part;
the bottom end of the fastening rod is fixed on the ground;
one end of the grounding wire, which is far away from the adjusting mechanism, is grounded;
the micro-motion trigger mechanism is arranged on the inner wall of the ring of the fastening chuck, is opposite to the metal conductive part of the adjusting mechanism, and comprises a bottom plate, two conductive contacts, a spring, a pressing plate, a contact and a metal conductive plate; the two conductive contacts are arranged on the bottom plate and are connected with the signal transmitting box through corresponding wires; two ends of the spring are respectively fixed on the bottom plate and the pressing plate; the contact is arranged on one side of the pressing plate away from the bottom plate, and a metal conducting strip matched with the two conducting contacts is formed on the side surface of one side of the pressing plate facing the bottom;
the signal transmitting box is arranged on the outer wall of the ring of the fastening chuck, and a first power supply and a signal transmitting circuit board are arranged in the signal transmitting box; the first power supply and the signal transmitting circuit board are connected into a loop by two leads connected with two conductive contacts on the micro-motion trigger mechanism; the signal transmitting circuit board is also connected with the input end of the rear end signal receiving locking power transmission device in a wireless mode, and generates and transmits a front end grounding signal when a loop formed by the signal transmitting circuit board and the first power supply is electrically conducted;
when the adjusting mechanism is adjusted to move towards the micro-motion triggering mechanism to a first position to lock the to-be-overhauled power branch or bus, the to-be-overhauled power branch or bus can form a grounding state, a contact on the micro-motion triggering mechanism drives a pressing plate to extrude a spring, and a metal conducting plate of an upper pressing plate of the micro-motion triggering mechanism is driven to be abutted against two conducting contacts of a bottom plate to realize that a first power supply in a signal transmitting box supplies power to the signal transmitting circuit board, so that the signal transmitting circuit board generates a front-end grounding signal and transmits the signal to an input end of a rear-end signal receiving locking power transmission device; or
When the adjusting mechanism moves to a second position far away from the micro-motion triggering mechanism to loosen the power branch line or the bus to be overhauled, the grounding state formed by the power branch line or the bus to be overhauled can be automatically removed, and the spring on the micro-motion triggering mechanism automatically recovers to drive the metal conducting strip of the upper pressing plate of the micro-motion triggering mechanism to be separated from the two conducting contacts of the bottom plate to realize the power failure between the first power supply and the signal transmitting circuit board in the signal transmitting box, so that the signal transmitting circuit board can not generate a front end grounding signal.
3. The system for monitoring the novel grounding wire of the power grid and realizing the power transmission locking of the circuit breaker as claimed in claim 2, wherein the signal transmitting circuit board is integrated with a signal transmitting circuit; wherein the content of the first and second substances,
the signal transmitting circuit comprises a first relay, a first indicator light and a signal transmitter; the coil control end is connected with the first indicator light in series and then connected with the first power supply through two wires connected with the two conductive contacts on the micro-motion trigger mechanism to form a loop, and the normally open contact is connected with the signal transmitter in series and then connected with the first power supply through two wires connected with the two conductive contacts on the micro-motion trigger mechanism to form another loop.
4. The system for monitoring the novel grounding wire of the power grid and locking the power transmission of the circuit breaker as claimed in claim 3, wherein the signal transmitter comprises a baseband chip for generating a front-end grounding signal and a signal transmitter chip; one end of the signal transmitter chip is connected with the baseband chip, and the other end of the signal transmitter chip is connected with the input end of the rear-end signal receiving locking power transmission device in a wireless mode.
5. The system for monitoring the novel grounding wire of the power grid and realizing the power transmission locking of the circuit breaker as claimed in claim 2, wherein the bottom end of the insulating part on the adjusting mechanism is in threaded connection with the top end of the fastening rod, and the length of the threaded connection is adjustable; wherein, be formed with the internal thread on the bottom inner wall of insulating part, be formed into the external screw thread on the top outer wall of fastening rod.
6. The system for monitoring the novel grounding wire of the power grid and realizing the power transmission locking of the circuit breaker according to claim 5, wherein the top end of the insulating part and the bottom end of the metal conducting part are detachably arranged on the adjusting mechanism.
7. The system for monitoring the novel grounding wire of the power grid and realizing the power transmission locking of the circuit breaker as claimed in claim 6, wherein a supporting frame is formed at the top end of the metal conductive part; wherein, the support frame is a concave arc.
8. A system for monitoring the ground wire of electric network and locking the power supply of breaker according to claim 7, wherein said fastening clip is made of insulating material, and its two ends are bent relatively and locked into a ring shape by a clip or a bolt.
9. The system for monitoring the novel grounding wire of the power grid and realizing the power transmission locking of the circuit breaker according to claim 2, wherein the back-end signal receiving and locking power transmission device comprises a signal receiver, an operational amplifier chip, a light emitting triode, an optical coupler, a second relay, a second indicator light and a second power supply; wherein the content of the first and second substances,
a positive power supply end, a negative power supply end, a signal receiving end and a signal output end are formed on the signal receiver; a positive electricity pin, a negative electricity pin, a level signal input end and a level signal output end are formed on the operational amplification chip; a coil control end and a normally closed contact are formed on the second relay;
a positive power supply end and a negative power supply end of the signal receiver are respectively and correspondingly connected with the positive electrode and the negative electrode of the second power supply, a signal receiving end is connected with a signal transmitting box on the front-end grounding and signal monitoring device in a wireless mode, and a signal output end is connected with a level signal input end of the operational amplification chip;
the positive electrode pin and the negative electrode pin of the operational amplification chip are respectively and correspondingly connected with the positive electrode and the negative electrode of the second power supply, and the level signal output end of the operational amplification chip is connected with the base electrode of the light-emitting triode;
the collector of the light emitting triode is connected with the anode of the second power supply, and the emitter of the light emitting triode is connected with the cathode of the second power supply;
the optocoupler, a coil control end of the second relay, the second indicator light and the second power supply are connected in series to form a loop, the optocoupler is arranged close to the light-emitting triode, and the second indicator light is arranged far away from the optocoupler;
the normally closed contact on the second relay is connected in series between a closing control loop on a circuit breaker which controls power transmission corresponding to the power branch or bus to be overhauled and an external power supply;
after the signal receiver receives a front end grounding signal of a signal transmitting box on the front end grounding and signal monitoring device, the operational amplification chip generates a high level signal to drive the light emitting triode to emit light, the optocoupler is driven to be connected with a loop of a coil control end of the second relay, the second indicator light and the second power supply in series, and a normally closed contact of the second relay is opened to cut off connection between a closing control loop on the circuit breaker and an external power supply.
10. The system for monitoring the novel ground wire of the power grid and locking the power transmission of the circuit breaker according to claim 9, wherein the normally closed contact of the second relay is arranged on a connecting wire between a closing control loop on the circuit breaker and an external power supply; or the switch-on control circuit is arranged on a connecting line of the switch-on control circuit on the circuit breaker.
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| CN201911408932.9A CN111049056B (en) | 2019-12-31 | 2019-12-31 | System for monitoring power grid grounding wire and realizing power transmission locking of circuit breaker |
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