CN210016327U - Monitoring device and monitoring system for automatic switch of distributed power distribution network - Google Patents

Abstract

The utility model discloses a monitoring device of a distributed distribution network automatic switch, which comprises a circuit parameter acquisition circuit, a switching value input circuit, a communication interface, a control loop, a relay output circuit, a signal acquisition circuit connected with the circuit parameter acquisition circuit, a device power supply, and a controller respectively connected with the circuit parameter acquisition circuit, the switching value input circuit, the communication interface, the control loop, the relay output circuit, the signal acquisition circuit and the device power supply, and also comprises a power direction element and a first display device, the power direction element is arranged between the circuit parameter acquisition circuit and the controller, current direction information flowing through the local monitoring device can be transmitted to the controller, the controller displays the current direction on the first display device, and operation and maintenance personnel can be facilitated to position fault points in the distributed power distribution network. The utility model also discloses a distributed power distribution network automatic switch's monitored control system has above-mentioned beneficial effect.

Description

Monitoring device and monitoring system for automatic switch of distributed power distribution network

Technical Field

The utility model relates to a distribution network automation technical field especially relates to a distributed power distribution network automatic switch's monitoring device and monitored control system.

Background

With the continuous development of the distribution network automation technology and the improvement of the requirement of users on the power supply reliability, the construction and operation of the distribution network automation are very important, and a foundation is laid for fault isolation and rapid recovery of non-fault area power supply.

Feeder automation is an important component of distribution network automation. To realize feeder automation, a reasonable distribution network structure is needed and the condition of ring network power supply is met; the operation mechanisms of the switches in the ring network switches, the load switches and the street power distribution station have to have a remote operation function; a reliable switch operation device power supply, a protection measurement and control device (FTU) and a working device power supply for communication equipment are required to be arranged in the ring network switch cabinet; the communication system is reliable and is not influenced by the external environment. Under the normal state, the feeder line automatic system monitors the states of the feeder line section switch and the interconnection switch and the current and voltage conditions of the feeder line in real time, and realizes remote or local switching-on and switching-off operations of the line switch. And obtaining a fault record when a fault occurs, automatically judging and isolating a fault section of the feeder line, and rapidly recovering power supply to a non-fault area. The fault location, isolation and automatic recovery are of great significance to improving the reliability of power supply and shortening the power failure time of a non-fault area.

The existing fault removal logic is that the automatic switch starts logic judgment (logic judgment time suggestion 2s) after detecting a fault, and if the automatic switch has a fault and the automatic switches on two sides have a fault signal on one side, a fault point is positioned on the rear side of the automatic switch, and then fault removal operation is executed. The existing fault isolation logic is that the automatic switch has no fault, and when only one side of the automatic switches on two sides has fault current, the fault is positioned on the front side of the automatic switches, and then fault isolation operation is executed.

However, the structure of the power distribution network is changed along with the access of the distributed power supply, power supply points in the system are independent from each other, and the fault location and processing process is more complicated when the system is transited from a radiation type network to a network in which user loads are directly connected with the distributed point power supply.

FIG. 1 is a schematic diagram of a "2-1" single-ring network connection mode of a distributed power distribution network; fig. 2 is a schematic diagram of the operation of an automatic switch of a distributed power distribution network in the prior art. As shown in fig. 1, taking a "2-1" single ring network connection mode as an example, CB1 and CB2 are substation-side power sources, FB1 is a distributed power source, and K1 to K8 and K21 to K26 are automatic switches. As shown in fig. 2, when a fault occurs between K4 and K5, since K1 to K5 all sense fault current, according to the slow-acting intelligent distributed logic, the fault should be cut off by the action of K5, isolated by the action of K6, and power is switched on by the action of K8. However, due to the existence of the distributed power supply FB1, the current flowing direction between K5 and K6 is different from the current flowing direction under the traditional power distribution network, so that K4 and K5 get wrong fault point positioning or logic confusion cannot obtain fault point positioning results, and applied fault removal and fault isolation operations cannot be performed. When the line fault trips, operation and maintenance personnel also have difficulty in determining the position of the fault point.

How to enable operation and maintenance personnel to more conveniently confirm the specific position of a fault point in the distributed power grid, reduce the working pressure of the operation and maintenance personnel and accelerate the repair of the fault of the distributed power distribution grid is a technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a distributed power distribution network automatic switch's monitoring device and monitored control system for make fortune dimension personnel can be more convenient confirm the concrete position of fault point in the distributed power grid, alleviate fortune dimension personnel's operating pressure, accelerate the restoration to distributed power distribution network trouble

In order to solve the technical problem, the utility model provides a pair of distributed power distribution network automatic switch's monitoring device, including circuit parameter acquisition circuit, switching value input circuit, communication interface, control circuit, relay output circuit, with the signal acquisition circuit that circuit parameter acquisition circuit connects, the device power, and respectively with circuit parameter acquisition circuit switching value input circuit communication interface control circuit relay output circuit signal acquisition circuit with the controller that the device power is connected, the controller be used for according to the circuit parameter acquisition circuit gathers with the switching value signal control of switching value input circuit input control circuit with relay output circuit carries out the protection action, still includes:

the power direction element is connected with the controller and is connected with a first display device, wherein the first input end of the power direction element is connected with a first relay which is connected with a protection current acquisition module in the circuit parameter acquisition circuit and is used for acquiring quick-break current, the second input end of the power direction element is connected with a second relay which is used for acquiring zero-sequence current and overload values, and the output end of the power direction element is connected with the controller;

the controller judges the direction of the current flowing through the local monitoring device according to the output value of the power direction element and controls the first display device to display the direction of the current.

Optionally, the power direction element is specifically a rectification type power direction relay.

Optionally, the first display device is specifically a touch screen.

Optionally, the electronic device further comprises a first indicator light circuit and a second indicator light circuit connected to the controller;

the controller controls an indicator lamp in the first indicator lamp circuit to be turned on when the current flowing through the local monitoring device is a preset forward current and the forward current is greater than a first preset value;

and the controller controls an indicator lamp in the second indicator lamp circuit to be turned on when the current flowing through the local monitoring device is a preset reverse current and the reverse current is greater than a second preset value.

Optionally, the system further comprises a second display device connected to the controller for displaying status information of the distributed switch protected by the local monitoring device.

Optionally, the system further comprises a wireless communicator connected with the controller.

Optionally, the wireless communicator is specifically a Wi-Fi communicator.

Optionally, the electronic device further comprises a third indicator light circuit, a fourth indicator light circuit and a fifth indicator light circuit, which are connected to the controller;

the controller controls an indicator lamp in the third indicator lamp circuit to light up when a fault removal failure occurs to a corresponding distributed switch, controls an indicator lamp in the fourth indicator lamp circuit to light up when a fault isolation failure occurs to the distributed switch, and controls an indicator lamp in the fourth indicator lamp circuit to light up when a communication abnormality occurs to the distributed switch.

Optionally, the controller further comprises a buzzer circuit connected with the controller;

and the controller controls a buzzer in the buzzer circuit to give an alarm when fault current flows through the local monitoring device.

In order to solve the technical problem, the utility model provides a distributed distribution network automatic switch's monitored control system is still provided, including above-mentioned arbitrary one distributed distribution network automatic switch's monitoring device, still include:

and the remote dispatching desk is in communication connection with the controller of the monitoring device and is used for acquiring and displaying the monitoring information of the monitoring device at the controller.

The utility model provides a monitoring device of distributed distribution network automatic switch, except circuit parameter acquisition circuit, switching value input circuit, communication interface, control circuit, relay output circuit, signal acquisition circuit connected with circuit parameter acquisition circuit, device power, and controller connected with circuit parameter acquisition circuit, switching value input circuit, communication interface, control circuit, relay output circuit, signal acquisition circuit and device power respectively, the monitoring device also comprises a power direction element and a first display device, wherein, the first input end of the power direction element is connected with a first relay for acquiring quick-break current of a protection current acquisition module in the circuit parameter acquisition circuit, the second input end is connected with a second relay for acquiring zero-sequence current and overload value of a zero-sequence current acquisition module connected in the circuit parameter acquisition circuit, the output end is connected with the controller, the first display device is connected with the controller, and the controller judges the direction of the current flowing through the local monitoring device according to the output value of the power direction element and controls the first display device to display the direction of the current. Through connecting power direction component with between circuit parameter acquisition circuit and the controller, provide the direction of the electric current that flows through local monitoring device to the controller, the direction of controller control demonstration electric current on first display device helps fortune dimension personnel to carry out quick, accurate location to the fault point in the distributed power distribution network according to the direction of electric current, consequently compare in prior art, this monitoring device can make fortune dimension personnel confirm the concrete position of feeder fault point more conveniently, has lightened fortune dimension personnel's operating pressure, has accelerated the restoration to distributed power distribution network fault. The utility model also provides a distributed power distribution network automatic switch's monitored control system has above-mentioned beneficial effect, no longer gives unnecessary details here.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained from the drawings without inventive work.

FIG. 1 is a schematic diagram of a "2-1" single-ring network connection mode of a distributed power distribution network;

fig. 2 is a schematic diagram illustrating the operation of an automatic switch of a distributed power distribution network in the prior art;

fig. 3 is a schematic structural diagram of a monitoring device for an automatic switch of a distributed power distribution network according to an embodiment of the present invention;

fig. 4(a) is a circuit diagram of a power steering element according to an embodiment of the present invention;

FIG. 4(b) is a circuit diagram of an actuator loop in the power steering element shown in FIG. 4 (a);

fig. 4(c) is a schematic diagram of a 90 ° wiring method of a power direction element according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a panel of a monitoring device for an automatic switch of a distributed power distribution network according to an embodiment of the present invention;

fig. 6 is a schematic panel diagram of another monitoring device for an automatic switch of a distributed power distribution network according to an embodiment of the present invention;

fig. 7 is a schematic diagram of displaying the fault scenario shown in fig. 2 according to an embodiment of the present invention.

Detailed Description

The core of the utility model is to provide a distributed power distribution network automatic switch's monitoring device and monitored control system for make fortune dimension personnel can be more convenient confirm the concrete position of fault point in the distributed power grid, alleviate fortune dimension personnel's operating pressure, accelerate the restoration to the distributed power distribution network trouble.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Fig. 3 is a schematic structural diagram of a monitoring device for an automatic switch of a distributed power distribution network according to an embodiment of the present invention; fig. 4(a) is a circuit diagram of a power steering element according to an embodiment of the present invention; FIG. 4(b) is a circuit diagram of an actuator loop in the power steering element shown in FIG. 4 (a); fig. 4(c) is a schematic diagram of a 90 ° wiring method of a power direction element according to an embodiment of the present invention; fig. 5 is a schematic diagram of a panel of a monitoring device for an automatic switch of a distributed power distribution network according to an embodiment of the present invention; fig. 6 is a schematic panel diagram of another monitoring device for an automatic switch of a distributed power distribution network according to an embodiment of the present invention.

As shown in fig. 3, the embodiment of the utility model provides a distributed power distribution network automatic switch's monitoring device includes circuit parameter acquisition circuit, switching value input circuit, communication interface, control circuit, relay output circuit, with the signal acquisition circuit that circuit parameter acquisition circuit connects, the device power to and the controller of being connected with circuit parameter acquisition circuit, switching value input circuit, communication interface, control circuit, relay output circuit, signal acquisition circuit and device power respectively, the controller is used for carrying out the protection action according to the switching value signal control circuit and the relay output circuit of the circuit parameter acquisition circuit's collection and the input of switching value input circuit, still includes:

the power direction element is connected with the controller and a first display device connected with the controller, wherein the first input end of the power direction element is connected with a first relay SJ which is connected with a protection current acquisition module in a circuit parameter acquisition circuit and used for acquiring quick-break current, the second input end of the power direction element is connected with a second relay YJ which is connected with a zero sequence current acquisition module in the circuit parameter acquisition circuit and used for acquiring zero sequence current and overload values, and the output end of the power direction element is connected with the controller;

the controller judges the direction of the current flowing through the local monitoring device according to the output value of the power direction element and controls the first display device to display the direction of the current.

In specific implementation, the circuit parameter acquisition circuit comprises a bus voltage acquisition module connected with bus voltages YMc, YMb and YMc, a measurement current acquisition module, a protection current acquisition module and a zero sequence current acquisition module connected with three phase lines, wherein the quick-break overcurrent device is connected with the protection current acquisition module, one end of the quick-break overcurrent device is connected with a first relay SJ in an output mode, the other end of the quick-break overcurrent device is connected with a second relay TJ in an output mode, and the second relay TJ is further controlled by a remote jump signal.

The switch light input circuit comprises a remote control signal terminal, a spring energy storage signal terminal, a handcart working terminal, a handcart testing terminal, remote signaling terminals 5-12, a remote signaling common terminal and the like, wherein the remote control signal terminal, the spring energy storage signal terminal, the handcart working terminal, the handcart testing terminal and the remote signaling terminals 5-12 are all connected with the positive electrode of a 24V device power supply, and the remote signaling common terminal is connected with the negative electrode of the 24V device power supply.

The communication interface can adopt an RS485 communication interface.

The control loop comprises a power supply (+, -) terminal of the control device, a tripping input terminal, a tripping outlet terminal, a closing input terminal, an anti-tripping push-out terminal, a closing outlet terminal, a tripping monitoring terminal and a closing monitoring terminal, and the relay output circuit comprises a tripping output terminal, a closing output terminal and a logic tripping terminal.

The positive electrode and the negative electrode of the power supply of the control device are respectively connected with the power supply ends + KM and-KM of the device, the tripping input terminal and the tripping outlet terminal are connected with the switch TQ, and a hand tripping switch is further arranged on a loop of the tripping input terminal and used for controlling tripping action; the switching-on input terminal, the switching-on outlet terminal and the switching-on terminal of the relay output circuit are connected with the switch HQ, and a hand switch is further arranged on a loop of the switching-on input terminal and used for controlling switching-on action.

The signal acquisition circuit comprises an accident Signal (SJ) acquisition circuit, a forecast signal (YJ) acquisition circuit, a device fault (GZJ) acquisition circuit, a reset input (+, -) circuit and the like, and the accident Signal (SJ) acquisition circuit, the forecast signal (YJ) acquisition circuit and the device fault (GZJ) acquisition circuit are also connected with circuits comprising a signal power supply, a single-phase electric energy meter (DD) and a high-voltage circuit breaker (DL), and particularly shown in figure 3.

Besides, the embodiment of the utility model provides a distributed distribution network automatic switch's monitoring device still includes power direction component and a display device, and the controller passes through the output of power direction component and judges the fault current's of flowing through local monitoring device direction, as the foundation of location fault point. In the embodiment of the utility model, refer to the distributed distribution feeder structure that fig. 1 shows to the electric current that flows out from power CB1 is forward current, and the electric current that flows to power CB1 is reverse current.

The power direction element is also called a power direction relay and is mainly divided into an amplitude comparison type and a phase comparison type according to the principle. The basis for judging the current to be in the forward direction by the phase comparison includes that the current direction is bus → line and the voltage is that the bus is higher than the ground, otherwise, the current is in the reverse direction.

The power direction element can adopt a rectification type power direction relay, the structure of which is shown in fig. 4(a) and 4(b), the power direction element comprises a voltage forming loop, a comparison loop and an actuating element, and the 90-degree wiring mode is shown in fig. 4(c), namely, the power direction element is symmetrical in three phases and has power factor

In the case of (a) in (b),

advance in

90 ° wiring, the parameters are shown in the following table:

TABLE 1 Power Direction element parameter Table

The voltage forming loop consists of DKB and YB, resistors R1 and R2 are used for eliminating shunt running and adjusting balance, a capacitor C1 is used for forming resonance with the excitation reactance of the YB to lead 90 degrees, the memory function of the capacitor C1 is used for eliminating dead zones, and the memory time is tens of milliseconds. The comparison loop is composed of a semiconductor rectifier bridge. The actuator being a polarising relay K_PSee mark ". when current flows in from the terminals, the relay K is polarized_PAnd (4) acting, otherwise, not acting.

Phase voltage

Sum phase current

Is converted into

Then the working voltage is obtained by series connection

Brake voltageAfter rectification, the current enters a circulating current amplitude comparison circuit and is transmitted by a polarized relay K_PAnd (6) executing. Polarized relay K_PThe action equation of (1) is:

when the power direction element is adopted to execute directional current protection (mainly positive direction three-phase symmetrical short circuit protection) of interphase short circuit, the power direction element can be used for the protectionAs a reference, to

For example, the interval of interphase short-circuit protection is [ - α -90 °, - α +90 ° ]]Wherein α is the angle of voltage leading current, generally 45 deg. is taken

And

the included angle of (A) is [ -135 DEG, 45 DEG [ -135 DEG ]]. Principle and phase current direction protection in zero sequence direction protectionSimilarly, the first and second electrodes are arranged in a parallel manner,

is zero sequence voltage U₀，

Is zero sequence current I₀Generally speaking, when a small current grounding system is in a normal state, the zero sequence current leads 90 degrees of zero sequence voltage, and when a fault occurs, the zero sequence voltage after the zero sequence current is 90 degrees, so that the action interval is generally [180 degrees ], 360 degrees]. When a large-current grounding system is in fault, the zero-sequence current leads the zero-sequence voltage by 110 degrees, and the action interval is generally [15 degrees ] and 195 degrees °]Left and right.

Then, for the embodiment of the present invention, the power direction interval of the zero sequence current (zero sequence current I)₀And zero sequence voltage U₀The included angle) is: [0 °, 180 ° ]]dir＝1，[180°，360°]dir is 2; the inter-phase current takes a sensitive angle of 45 DEG, and the power direction interval (And

and

and) Comprises the following steps: [45 °, 225 ° ]]dir＝1， [225°，45°]dir is 2. The dir is 1, and 2 indicates a power flow direction, and is related to an installation direction of the current transformer, and a general installation mode is that a bus side of the ring main unit is a polar end, and the other side is a non-polar end.

Optionally, the first display device may adopt a touch screen.

As shown in fig. 5, the panel effect of the monitoring device for automatic switch of distributed power distribution network according to the embodiment of the present invention is schematically shown in fig. 5, except for the name plate, the device comprises a display window for displaying A phase current, B phase current and C phase current, a voltage and current type selection knob, a condensation controller, a lighting lamp switch, an energy storage indicator lamp, a separating indicator lamp, a closing indicator lamp, a signal source selection knob (OK), a separating and closing selection knob (1SA), a protection tripping outlet pressing plate (LP1), a protection closing outlet pressing plate (LP2), a remote control separating outlet pressing plate (LP3), a remote control closing outlet pressing plate (LP4), a reclosing function input pressing plate (LP5) and a synchronous function input pressing plate (LP6), and also comprises a first display device, words such as "forward fault current I ≧ 828A" or "reverse fault current I ≧ 828A" can be displayed therein.

The indicating lamps with different functions are set to be different colors, for example, the energy storage indicating lamp is set to be yellow, the position dividing indicating lamp is set to be green, and the closing indicating lamp is set to be red; the pressing plates with different functions are set to be different colors, for example, the outlet pressing plate is red, and the functional pressing plate is yellow; the connecting piece is screwed up with the screw type pressing plate, and the opening end is arranged above.

Furthermore, each switch and knob should be provided with a plastic cover to prevent accidental touch.

Optionally, the monitoring device for the automatic switch of the distributed power distribution network may further include a first indicator light circuit and a second indicator light circuit connected to the controller;

the controller controls an indicator light L1 in the first indicator light circuit to light when the current flowing through the local monitoring device is a preset forward current and the forward current is greater than a first preset value;

the controller controls the indicator light L2 in the second indicator light circuit to light when the current flowing through the local monitoring device is a preset reverse current and the reverse current is greater than a second preset value.

The panel effect of the monitoring device added with the first indicator light circuit and the second indicator light circuit is shown in fig. 6, and a forward fault current indicator light and a reverse fault current indicator light can be arranged side by side with other indicator lights.

Optionally, the monitoring device of the automatic switch of the distributed power distribution network may further include a second display device connected to the controller for displaying status information of the automatic switch protected by the monitoring device. The state information of the automatic switch includes "failure removal success/failure", "failure isolation success/failure", "communication abnormality", "operation rejection", and the like.

In order to prompt operation and maintenance personnel more obviously, the monitoring device for the automatic switch of the distributed power distribution network can further comprise a buzzer circuit connected with the controller;

the controller controls a buzzer in the buzzer circuit to give an alarm when a fault current flows through the local monitoring device.

The embodiment of the utility model provides a monitoring device can be for being fixed in the protection measurement and control device on the secondary cell cabinet door with embedded mounting means, is connected with comprehensive measurement and control communication unit through ethernet or RS485 bus, and it should reserve 2 RJ45 network interface above and to correspond to synthesize measurement and control communication unit.

The protection measurement and control device message requirements include:

the event sequence records are classified into equipment fault sequence records and automatic equipment fault sequence records;

the intelligent distributed signals received by the protection measurement and control device are stored as SOE records, such as signals of fault current detected by adjacent switches, fault removal signals sent by adjacent switches, fault isolation signals sent by adjacent switches, action rejection signals sent by adjacent switches, communication fault signals of the switch and the like;

the jitter signal should be filtered during the event sequence recording.

The utility model provides a monitoring device of distributed distribution network automatic switch, except the circuit parameter acquisition circuit, the switching value input circuit, the communication interface, the control circuit, the relay output circuit, the signal acquisition circuit connected with the circuit parameter acquisition circuit, the device power, and the controller respectively connected with the circuit parameter acquisition circuit, the switching value input circuit, the communication interface, the control circuit, the relay output circuit, the signal acquisition circuit and the device power, the monitoring device also comprises a power direction element and a first display device, wherein, the first input end of the power direction element is connected with a first relay which is connected with a protective current acquisition module in the circuit parameter acquisition circuit and is used for acquiring the quick-break current, the second input end is connected with a second relay which is connected with a zero sequence current acquisition module in the circuit parameter acquisition circuit and is used for acquiring the zero sequence current and the overload value, the output end is connected with the controller, the first display device is connected with the controller, and the controller judges the direction of the current flowing through the local monitoring device according to the output value of the power direction element and controls the first display device to display the direction of the current. Through connecting power direction component with between circuit parameter acquisition circuit and the controller, provide the direction of the electric current that flows through local monitoring device to the controller, the direction of controller control demonstration electric current on first display device helps fortune dimension personnel to carry out quick, accurate location to the fault point in the distributed power distribution network according to the direction of electric current, consequently compare in prior art, this monitoring device can make fortune dimension personnel confirm the concrete position of feeder fault point more conveniently, has lightened fortune dimension personnel's operating pressure, has accelerated the restoration to distributed power distribution network fault.

On the basis of the above embodiment, in another embodiment, the monitoring device for the automatic switch of the distributed power distribution network may further include a wireless communicator connected with the controller.

In particular implementations, the wireless communicator may specifically employ a Wi-Fi communicator or a GPRS communicator.

In addition, the monitoring device of the automatic switch of the distributed power distribution network can further comprise a third indicator light circuit, a fourth indicator light circuit and a fifth indicator light circuit which are connected with the controller;

the controller controls the indicator lamp in the third indicator lamp circuit to light when the corresponding automatic switch fails to remove the fault, controls the indicator lamp in the fourth indicator lamp circuit to light when the automatic switch fails to isolate the fault, and controls the indicator lamp in the fourth indicator lamp circuit to light when the automatic switch has communication abnormity.

Each embodiment that distributed distribution network automatic switch's monitoring device corresponds has been elaborated above, on this basis, the utility model discloses still disclose with the distributed distribution network automatic switch's including above-mentioned device monitored control system.

Except the monitoring device of the distributed distribution network automatic switch that above-mentioned embodiment provided, the embodiment of the utility model provides a distributed distribution network automatic switch's monitored control system still includes:

and the remote dispatching desk is in communication connection with the controller of the monitoring device and is used for acquiring and displaying the monitoring information of the monitoring device at the controller.

The foregoing details various embodiments corresponding to the monitoring device for automatic switching of a distributed power distribution network, and on this basis, the corresponding monitoring method includes:

when detecting that a main line of the power distribution network has a fault, the controller analyzes the direction of fault current of a local monitoring device and exchanges detection information with monitoring devices of automatic switches adjacent to two sides;

when the controller analyzes that the fault current of the local monitoring device is preset forward current and the fault current exists on the automatic switch on only one side of the two sides of the local monitoring device, locating a fault point on the rear side of the local monitoring device and controlling to execute fault removal operation;

and when the controller analyzes that the fault current of the local monitoring device is preset reverse current and the fault current exists on the automatic switch on only one side of the two sides of the local monitoring device, positioning a fault point on the front side of the local monitoring device and executing fault isolation operation.

Further, the monitoring method for the automatic switch of the distributed power distribution network can also comprise

And the controller transmits the direction of the fault current of the local monitoring device, the detection information of the adjacent automatic switches, the positioning result of the fault point and the result of executing the protection action to the remote dispatching desk.

In specific implementation, when the controller obtains that the fault current flows through the automatic switch corresponding to the local monitoring device by analyzing circuit parameters, the controller starts logic judgment, if the self fault current is in a forward direction and the fault current flowing through the automatic switch on one side of the two sides is in a reverse direction, if the fault current is in the reverse direction, the controller positions a fault point on the rear side of the switch, and if the outlet conditions of 'switch on position' and 'no voltage' and the like are met within the logic judgment time, a tripping command can be sent; wait Tdz4 time (100ms is switch action time), if not, set fault removal flag.

Or, the self detects the fault and starts the logic judgment, if the self fault current is the positive direction and only one side of the automatic switches has fault current, the fault point is positioned at the rear side of the self fault current, and if the outlet conditions of 'switch on position' and 'no voltage' are met within the logic judgment time, a tripping command can be sent; wait Tdz4 time (100ms is switch action time), if not, set fault removal flag.

If the self fault current is in a reverse direction (the forward direction is suitable for a power distribution network without a distributed power switch), and only one side of the two sides has one fault current, positioning the fault at the front side of the two sides and starting logic judgment; when the switch is closed within the logic judgment time from the pressure to the non-pressure state, a tripping command can be sent out; waiting for Tdz4 time (100ms is switch action time), if not refusing to move the flag bit of "fault isolation success".

After the fault is removed or isolated successfully, the monitoring device sends a signal of fault removal or fault isolation success to the main station; after the fault isolation is successful, the monitoring device should also send a "fault isolation success" signal to the tie switch.

Fig. 7 is a schematic diagram of displaying the fault scenario shown in fig. 2 according to an embodiment of the present invention.

As shown in fig. 7, use the utility model discloses distributed distribution network automatic switch's monitoring device and monitoring method, K4 self detects the fault start logic and judges, and self fault current is forward, and only K5 one side fault current in both sides is reverse, and fault current is reverse switch at its rear side, then fixes a position the fault point at its rear side, so trip, if there is not rejection, sets "failure removal success" sign.

The fault current of the K5 is reverse, only one side of the K4 on two sides has fault current, the fault is positioned on the front side of the fault current, the fault is tripped, and if the fault current is not rejected, a fault isolation success mark is set.

Meanwhile, a forward fault current signal display mark and a reverse fault current signal display mark are added on a monitoring interface of a ring network diagram or a single line diagram of the dispatching desk, so that a dispatcher can clearly know the flow direction of the fault current; and automatic signal light word boards of 'failure removal success' and 'failure isolation success' are added, so that failure points are clear at a glance. The method provides a technical support for rapid fault location of dispatchers and field operation and maintenance personnel, and facilitates analysis of the action condition of the automation equipment after a fault occurs.

It is right above the utility model provides a distributed power distribution network automatic switch's monitoring device, monitoring method and monitored control system have introduced in detail. The embodiments are described in a progressive manner, the emphasis of each embodiment is different from that of other embodiments, and the same and similar parts among the embodiments are referred to each other.

It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. The utility model provides a monitoring device of distributed power distribution network automatic switch, includes circuit parameter acquisition circuit, switching value input circuit, communication interface, control circuit, relay output circuit, with the signal acquisition circuit that circuit parameter acquisition circuit connects, the device power, and respectively with circuit parameter acquisition circuit switching value input circuit communication interface the control circuit relay output circuit signal acquisition circuit with the controller that the device power is connected, the controller be used for according to the circuit parameter that circuit parameter acquisition circuit gathered with the switching value signal control of switching value input circuit input the control circuit with relay output circuit carries out the protection action, its characterized in that still includes:

the power direction element is connected with the controller and is connected with a first display device, wherein the first input end of the power direction element is connected with a first relay which is connected with a protection current acquisition module in the circuit parameter acquisition circuit and is used for acquiring quick-break current, the second input end of the power direction element is connected with a second relay which is used for acquiring zero-sequence current and overload values, and the output end of the power direction element is connected with the controller;

the controller judges the direction of the current flowing through the local monitoring device according to the output value of the power direction element and controls the first display device to display the direction of the current.

2. Monitoring device according to claim 1, characterized in that the power direction element is in particular a commutating power direction relay.

3. The monitoring device of claim 1, wherein the first display device is a touch screen.

4. The monitoring device of claim 1, further comprising a first indicator light circuit and a second indicator light circuit connected to the controller;

the controller controls an indicator lamp in the first indicator lamp circuit to be turned on when the current flowing through the local monitoring device is a preset forward current and the forward current is greater than a first preset value;

and the controller controls an indicator lamp in the second indicator lamp circuit to be turned on when the current flowing through the local monitoring device is a preset reverse current and the reverse current is greater than a second preset value.

5. The monitoring device of claim 1, further comprising a second display device coupled to the controller for displaying status information of distributed switches protected by the local monitoring device.

6. The monitoring device of claim 1, further comprising a wireless communicator connected to the controller.

7. Monitoring device according to claim 6, wherein the wireless communicator is in particular a Wi-Fi communicator.

8. The monitoring device of claim 1, further comprising a third indicator light circuit, a fourth indicator light circuit, and a fifth indicator light circuit connected to the controller;

the controller controls an indicator lamp in the third indicator lamp circuit to light up when a fault removal failure occurs to a corresponding distributed switch, controls an indicator lamp in the fourth indicator lamp circuit to light up when a fault isolation failure occurs to the distributed switch, and controls an indicator lamp in the fourth indicator lamp circuit to light up when a communication abnormality occurs to the distributed switch.

9. The monitoring device of claim 1, further comprising a buzzer circuit connected to the controller;

and the controller controls a buzzer in the buzzer circuit to give an alarm when fault current flows through the local monitoring device.

10. A monitoring system for automatic switch of distributed power distribution network, comprising the monitoring device for automatic switch of distributed power distribution network according to any one of claims 1 to 9, further comprising:

and the remote dispatching desk is in communication connection with the controller of the monitoring device and is used for acquiring and displaying the monitoring information of the monitoring device at the controller.

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