CN217087244U - Anti-islanding protection device - Google Patents

Abstract

The utility model provides an anti-islanding protection device. The anti-islanding protection device comprises a square cabinet body arranged on one side of a square wall pasting board, wherein a step-shaped connecting plate is fixedly arranged on one side, close to the square wall pasting board, of the square cabinet body, the step-shaped connecting plate is arranged on the square wall pasting board, a square cabinet door is arranged on the square cabinet body, a liquid crystal display screen and a plurality of first buttons are arranged on the square cabinet door, and a stabilizing mechanism and a heat dissipation mechanism are arranged in the square cabinet body; the stabilizing mechanism comprises a circuit board, the circuit board is arranged in the square cabinet body, and a square connecting plate is fixedly mounted on the inner wall of the bottom of the square cabinet body. The utility model provides a prevent island protection device has convenient to use, can be simple effectual to installing the internal circuit board at square cabinet, carries out effectual heat dissipation, increase of service life's advantage during the working.

Description

Anti-islanding protection device

Technical Field

The utility model belongs to the technical field of electrical apparatus auxiliary assembly, especially, relate to an anti-islanding protection device.

Background

An anti-islanding protection device, as the name suggests, is to prevent potential danger and equipment damage caused by islanding effect of a power grid, which is anti-islanding control of a photovoltaic grid-connected inverter that is always concerned by engineering and power generation equipment owners in the industry for a long time, so that islanding effect must be prevented in a photovoltaic grid-connected power generation system, and the importance of anti-islanding protection in a distributed photovoltaic power generation station is also explained;

in the related art, an anti-islanding protection device is disclosed, which comprises an AC module, an intelligent DO module, an intelligent DI module, an intelligent SIG module, a CPU module, a power supply module, an HMI module and a motherboard module, wherein the AC module and the HMI module are respectively connected with the CPU module, and the intelligent DO module, the intelligent DI module and the intelligent SIG module are respectively connected with the CPU module through an intelligent IO bus in the motherboard module; the AC module, the HMI module, the intelligent DO module, the intelligent DI module, the intelligent SIG module and the power supply module are plugged on the motherboard module, so that the application range of the anti-islanding protection device is increased, and the anti-islanding protection device has a good application prospect.

However, the above structure has disadvantages that, due to the development of intelligence, the electrical components are directly mounted in the square cabinet body and directly disposed on the circuit board, however, the circuit board is usually directly fixed on the inner wall of the square cabinet body, and the electrical components generate heat during operation, so that heat dissipation of the circuit board is inconvenient, and short circuit is easily caused.

Therefore, there is a need to provide a new anti-islanding protection device to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide a convenient to use, can be simple effectual to installing the internal circuit board at square cabinet, carry out effectual heat dissipation, increase of service life prevents island protection device at the during operation.

In order to solve the technical problem, the anti-islanding protection device provided by the utility model comprises a square cabinet body arranged on one side of a square wall-attached plate, wherein a step-shaped connecting plate is fixedly arranged on one side of the square cabinet body close to the square wall-attached plate, the step-shaped connecting plate is arranged on the square wall-attached plate, a square cabinet door is arranged on the square cabinet body, a liquid crystal display screen and a plurality of first buttons are arranged on the square cabinet door, and a stabilizing mechanism and a heat dissipation mechanism are arranged in the square cabinet body;

the fixing mechanism comprises a circuit board, the circuit board is arranged in a square cabinet body, a square connecting plate is fixedly mounted on the inner wall of the bottom of the square cabinet body, a square mounting groove is formed in the top of the square connecting plate, a square connecting block is arranged in the square mounting groove, the top of the square connecting block extends out of the square mounting groove and is fixedly connected with the bottom of the circuit board, two transverse pull rods are slidably mounted in the square mounting groove, one ends, away from each other, of the two transverse pull rods extend out of the square mounting groove, a circular fixing plate is fixedly mounted at one end, close to the square connecting block, of each transverse pull rod, circular clamping grooves are formed in two sides of the square connecting block, and the circular clamping grooves are matched with the corresponding circular fixing plates;

as a further scheme of the utility model, heat dissipation mechanism is including L type box, L type box sets up on the circuit board, be equipped with the air-cooler on the L type box, fixed mounting has the pneumatic cylinder on the top inner wall of the square cabinet body, the output shaft and the L type box fixed connection of pneumatic cylinder.

As a further scheme of the utility model, the notch cuttype mounting groove has been seted up to one side that square form wainscot is close to the notch cuttype connecting plate, notch cuttype mounting groove and notch cuttype connecting plate looks adaptation.

As a further scheme of the utility model, the slip cap is equipped with expanding spring on the transverse pull rod, expanding spring's one end and circular firm board fixed connection, expanding spring's the other end and one side inner wall fixed connection of square mounting groove, circular connecting hole has all been seted up on the both sides inner wall of square mounting groove, circular connecting hole and the transverse pull rod sliding connection who corresponds.

As a further scheme of the utility model, square form is equipped with four first screws on pasting the wallboard, square form is pasted the wallboard and is passed through four first screw fixed mounting on the wall.

As a further scheme of the utility model, be equipped with two hinges on the square cabinet body, the square cabinet body is connected through two hinges with square cabinet door.

As a further proposal of the utility model, the circuit board is provided with a CPU plug-in, an AC alternating current sampling plug-in, a DIDO plug-in and a man-machine conversation HMI plug-in.

As a further aspect of the utility model, the bottom nestification of square connecting block has a plurality of balls, the ball is with the bottom inner wall sliding connection of square mounting groove.

Compared with the prior art, the utility model provides an anti-islanding protection device has following beneficial effect:

1. the utility model discloses a set up firm mechanism, firm mechanism can be simple to have to install the circuit board of a plurality of electrical components in square cabinet internal back, carry on preliminary firm, avoid the condition that removes about appearing;

2. the utility model discloses a set up heat dissipation mechanism, heat dissipation mechanism can be simply effectual to the timely effectual heat dissipation of the circuit board of installing a plurality of electrical components, avoids the heat in time to give off the condition that the short circuit appears.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic front view of an anti-islanding protection device according to a preferred embodiment of the present invention;

fig. 2 is a top view and a side view of the square cabinet of the present invention;

FIG. 3 is a schematic view of the front view structure of the square wall-attached board of the present invention;

FIG. 4 is a front sectional view of the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is an assembly view of the L-shaped box and the hydraulic cylinder of the present invention;

fig. 7 is a schematic perspective view of the L-shaped box, the circular fixing plate and the transverse pull rod provided by the present invention;

fig. 8 is a schematic diagram of the two-stage current bidirectional protection provided by the present invention;

FIG. 9 is a schematic diagram of overload protection provided by the present invention;

fig. 10 is a schematic diagram of residual current protection provided by the present invention;

fig. 11 is a schematic diagram of the overvoltage protection provided by the present invention;

fig. 12 is a schematic diagram of the low voltage protection provided by the present invention;

fig. 13 is a schematic diagram of an automatic press-closing principle provided by the present invention;

fig. 14 is a schematic block diagram of incoming line island detection provided by the present invention;

fig. 15 is a schematic diagram of a forward-sequence reverse blocking area of the incoming line according to the present invention;

fig. 16 is a schematic block diagram of the reverse power protection provided by the present invention;

fig. 17 is a schematic diagram of the anomaly detection of the control loop provided by the present invention;

fig. 18 is a diagram of a device backplane provided by the present invention;

fig. 19 is a schematic wiring diagram provided by the present invention.

In the figure: 1. a square wall pasting board; 101. a step-shaped mounting groove; 2. a square cabinet body; 201. a step-shaped connecting plate; 202. a square cabinet door; 203. a liquid crystal display screen; 3. a circuit board; 4. an L-shaped box body; 401. an air cooler; 402. a hydraulic cylinder; 5. a square connecting plate; 6. a square mounting groove; 7. a transverse pull rod; 8. a circular stabilizing plate; 9. a square connecting block.

Detailed Description

Please refer to fig. 1 to fig. 19. The anti-islanding protection device comprises a square cabinet body 2 arranged on one side of a square wall pasting board 1, a stepped connecting board 201 is fixedly mounted on one side, close to the square wall pasting board 1, of the square cabinet body 2, the stepped connecting board 201 is arranged on the square wall pasting board 1, a square cabinet door 202 is arranged on the square cabinet body 2, a liquid crystal display screen 203 and a plurality of first buttons are arranged on the square cabinet door 202, and a stabilizing mechanism and a heat dissipation mechanism are arranged in the square cabinet body 2;

the fixing mechanism comprises a circuit board 3, the circuit board 3 is arranged in a square cabinet body 2, a square connecting plate 5 is fixedly installed on the inner wall of the bottom of the square cabinet body 2, a square mounting groove 6 is formed in the top of the square connecting plate 5, a square connecting block 9 is arranged in the square mounting groove 6, the top of the square connecting block 9 extends out of the square mounting groove 6 and is fixedly connected with the bottom of the circuit board 3, two transverse pull rods 7 are installed in the square mounting groove 6 in a sliding mode, the ends, away from each other, of the two transverse pull rods 7 extend out of the square mounting groove 6, a circular fixing plate 8 is fixedly installed at one end, close to the square connecting block 9, of each transverse pull rod 7, circular clamping grooves are formed in two sides of the square connecting block 9, and the circular clamping grooves are matched with the corresponding circular fixing plates 8;

the heat dissipation mechanism comprises an L-shaped box body 4, the L-shaped box body 4 is arranged on the circuit board 3, an air cooler 401 is arranged on the L-shaped box body 4, a hydraulic cylinder 402 is fixedly mounted on the inner wall of the top of the square cabinet body 2, and an output shaft of the hydraulic cylinder 402 is fixedly connected with the L-shaped box body 4.

Notch cuttype mounting groove 101 has been seted up to one side that square form wainscot 1 is close to notch cuttype connecting plate 201, notch cuttype mounting groove 101 and notch cuttype connecting plate 201 looks adaptation.

Sliding sleeve is equipped with expanding spring on horizontal pull rod 7, expanding spring's one end and 8 fixed connection of circular firm board, expanding spring's the other end and one side inner wall fixed connection of square mounting groove 6, circular connecting hole has all been seted up on the both sides inner wall of square mounting groove 6, circular connecting hole and the 7 sliding connection of horizontal pull rod that correspond.

The square wall attaching plate is characterized in that four first screws are arranged on the square wall attaching plate 1, and the square wall attaching plate 1 is fixedly installed on the wall surface through the four first screws.

The square cabinet body 2 is provided with two hinges, and the square cabinet body 2 is connected with the square cabinet door 202 through the two hinges.

The circuit board 3 is provided with a CPU plug-in, an AC (alternating current) sampling plug-in, a DIDO plug-in and a man-machine conversation HMI (human machine interface) plug-in, wherein the CPU plug-in is the core of the device and is a highly integrated CPU, and the CPU plug-in comprises the functions of chips such as an RAM (random access Memory), a Flash Memory, an AD (analog-to-digital) and the like; the AC plug-in unit comprises a power supply and an analog quantity acquisition unit; the TRIP plug-in unit comprises an outlet and an inlet.

The CPU plug-in is composed of a microprocessor CPU, a RAM, a ROM, a Flash Memory and the like. The CPU module has strong data processing and recording capacity, can realize various complex fault processing schemes and record a large amount of fault data, and the number of recordable events is not less than 500 times. The running configuration information such as protection fixed value is also stored in the memory, and the information can not be lost after the device is powered off.

The plug-in contains an RS485 bus chip with extremely high communication speed and a universal interface, and is a main communication interface for the device to be accessed into the comprehensive automation system. A hardware clock loop is also arranged in the plug-in unit, the adopted clock chip has high precision, and a battery is arranged for power failure holding. In addition, the CPU plug-in adopts a multilayer printed board and a surface packaging process, has small appearance and compact structure, and greatly improves the reliability and the anti-electromagnetic interference capability of the device.

AC sampling plug-in components:

d, direct current inverter power supply: after the DC220V voltage input passes through the anti-interference filter circuit, the DC voltage required by the device is output by using the inversion principle, and the device is not connected with the shell in a floating mode.

Analog quantity acquisition: external current is isolated and converted by an isolation mutual inductor and then is input to an analog-digital converter through a low-pass filter, and a CPU forms various digital protective relays after sampling digital processing and calculates various measured values in real time. The terminals UA, UB, UC, U0, IA, IB, IC and I0 are protection analog quantity input.

A DIDO plug-in:

external open-loop: 12 external open-in loops are arranged, a direct DC220V open-in mode is adopted, and anti-shake measures are adopted by device software, so that mistaken signaling is avoided.

An outlet relay: logic relays are directly driven by the CPU card, and such relays include: trip relays, closing relays, signal relays, etc.

Human machine dialogue HMI plug-in:

the HMI plug-in unit for man-machine conversation mainly has the function of displaying and protecting information output by a CPU, a display window on the plug-in unit adopts four rows of liquid crystal displays with eight Chinese characters in each row, a man-machine interface is clear and easy to understand, and a QN-500 series universal keyboard operation mode is configured, so that the man-machine conversation operation is convenient and simple. The plug-in is also provided with light indication information, so that the running information of the device is more visual.

The bottom of the square connecting block 9 is nested with a plurality of balls, and the balls are connected with the inner wall of the bottom of the square mounting groove 6 in a sliding mode.

The main technical indexes of the device are as follows:

technical parameters

1) Rated operating voltage AC220, DC220V or DC110V (Note by order)

2) Rated technical data

a) Alternating current: 5A or 1A (order note)

b) Alternating-current voltage: 400V or 100V (order note)

c) Frequency: 50HZ

3) Power consumption

The working power supply of the device is as follows: when the device works normally, the power is not more than 5W;

and when in protection action, the power is not more than 10W.

An alternating current loop: <1 VA/phase (IN ═ 5A);

<0.5 VA/phase (IN ═ 1A);

an alternating voltage circuit: <0.5 VA/phase;

4) the precise working range is as follows:

current: 0.04 In-20 In

Voltage: 0.4V-1.2 Un

Frequency: 0.9 Fn-1.1 Fn

Time: 0 to 100s

5) Protection part precision:

a) and (3) setting value precision: less than or equal to +/-5 percent;

b) time precision: setting time of +/-1% plus 35ms

c) The whole group of action time: less than or equal to 35 ms;

d) frequency precision: less than or equal to 0.01 Hz;

6) measurement and control part precision:

a) accuracy of alternating current quantity: less than or equal to plus or minus 0.2 percent;

b) active and reactive: less than or equal to plus or minus 0.5 percent;

7) inputting a switching value:

inputting types: passive

Number of photoelectric isolation inputs: 8

The working voltage of the device is as follows: AC220V, DC220V, or DC110V

8) Capacity of open contact:

a) outlet relay

Rated current carrying capacity of the contact: 250Vac/220Vdc,5A

Output type passive (air contact)

b) A signal relay:

rated current carrying capacity of the contact: 250Vac/220Vdc,5A

Output type passive (air contact)

9) Communication interface

Number: 1

Electrical characteristics: RS485

The transmission mode is as follows: asynchronous

The communication protocol is as follows: MODBUS

Address: 1 to 110

Baud rate: less than or equal to 1Mbps

Communication medium: twisted pair or optical fiber

Environmental parameters of the device

Electrical environment:

a) insulation resistance

Under normal test atmospheric conditions, insulation resistance values are measured by a megohmmeter with open-circuit voltage of 500V between a charged circuit part of the device and non-charged metal and a shell as well as between circuits which are not electrically connected; under normal test atmospheric conditions, the insulation resistance of each loop should not be less than 100M omega.

b) Strength of medium

Under normal test atmospheric conditions, the device can bear a power frequency withstand voltage test with the frequency of 50Hz and the test voltage of 2000V lasting for 1min without breakdown flashover and component damage.

c) Impulse voltage

Under normal test atmospheric conditions, the short-time impulse voltage test of standard lightning waves of (1.2/50) mu s can be borne by the circuits of a direct current input circuit, an alternating current input circuit and a signal output contact of the device, the circuits are grounded and between the circuits, the open-circuit test voltage is 5kV, and no insulation damage exists.

d) Pulse group interference

The device can bear 1MHz and 100kHz pulse group interference tests specified in GB/T14598.13-1998(idt IEC60255-22-1: 1988). The test severity grade is grade III, the test voltage is common mode 2.5Kv, and the differential mode is 1 kV.

e) Interference of radiated electromagnetic field

The device can bear the severe class III radiation electromagnetic field interference test specified in GB/T14598.9-1995(idt IEC60255-22-3:1989), namely the test field strength is 10V/m.

f) Electrostatic discharge interference

The device can withstand electrostatic discharge interference tests of the severity class IV specified in GB/T14598.14-1998(idt IEC60255-22-2:1996), i.e. a contact discharge test voltage of 8kV with an allowable deviation of + -5%, and an air discharge test voltage of 15kV with an allowable deviation of + -5%.

g) Fast transient interference

The apparatus was capable of performing fast transient interference tests of class IV at the severity specified in GB/T14598.10-1996(idt IEC60255-22-4:1992), i.e.at a test voltage of 4kV with a tolerance of + -10%.

Natural environment of use of the device

Working temperature: -25 ℃ to 70 DEG C

Storage temperature: minus 40 to +85 DEG C

Humidity: 5 to 95% RH

Mechanical environment

a) The working conditions are as follows: the vibration response and the impact response with the harsh grade of I can be borne;

b) transportation conditions are as follows: durable to withstand vibration, impact and impact of severe class I

Function of the device

1. Protective function

1.1 two-stage timing current-limiting direction protection

The device is provided with I and II sections of current direction protection, and the fixed values of current, time and direction of each section can be independently set. The protection on-off control fixed value can independently control the on-off of each section, and the meaning of the on-off control fixed value is as follows:

0: exit, 1-2: input-1: pure overflow, 2: direction overflow

The fixed value meaning of the direction control word is as follows:

0: in the reverse direction, 1: positive direction of the process

The overcurrent protection is provided with a soft pressing plate, and the corresponding protection section is only put into use when the soft pressing plate and the on-off control fixed value are both put into use.

The two-stage current and voltage direction protection interphase power direction element adopts 90-degree wiring (in the device, the current in the power generation state is defined as a positive direction, the current in the power receiving state is defined as a negative direction, and the direction elements of the device all follow the direction criterion), and the action equations are (Ia and Ubc are examples) by utilizing the respective ratios of Ia and Ubc, Ib and Uca, and Ic and Uab:

wherein phi is the maximum sensitivity angle, and phi is-30 degrees.

The device has overload protection

The device is provided with overload protection, the soft pressing plate and the switching control words are used for switching, and the protection is only switched when the soft pressing plate and the switching control words are switched. The protection can be selected to act on tripping or alarming, and the value of the overload protection on-off control fixed value is defined as follows:

quitting at 0: 1-2: throwing-1: tripping and alarming at 2: alarming.

The device has residual current protection

The device is provided with residual current protection, the soft pressing plate and the input and output control words are used for inputting and outputting, and the protection is only input when the soft pressing plate and the input and output control words are both input. The protection can be selected to act on tripping or alarming, and the value meaning of the trip control fixed value is as follows:

quitting at 0: 1-2: throwing-1: tripping and alarming at 2: alarming.

The device has overvoltage protection

The device is provided with overvoltage protection, the soft pressing plate and the switching control word are used for switching on and switching off, and the protection is only switched on when the soft pressing plate and the switching control word are switched on.

The device has low voltage protection

The device is provided with low-voltage protection, the soft pressing plate and the switching control words are used for switching, and the protection is only switched when the soft pressing plate and the switching control words are switched.

The device has automatic press switch

The device is provided with an automatic pressing switch-on function, the soft pressing plate and the switching control words are used for switching on and off, and protection is only put into the device when the soft pressing plate and the switching control words are both put into the device. The automatic pressure switch-on function is applied to a distributed power generation mode, and means that when the incoming line switch is in a jumping position, the system automatically switches on after switch-on delay of the system after the voltage of a main power grid is detected to be recovered to be normal and the distributed power generation side has no pressure. After all protection actions, the automatic press-closing can still act once, if the protection acts again within 20S after the action once, the automatic press-closing is locked forever, and the automatic press-closing is opened again after hand-closing and remote-closing commands are sent out; if the protection in 20S does not act (is in the closed position), the automatic press closing is opened. When the device is in maintenance (the signal is sent during the maintenance), the automatic closing function is locked.

The device has passive island detection

The device is provided with passive island protection, and can be switched on and off by a soft pressing plate and switching-on and switching-off control words. The passive island detection considers factors such as under \ over-frequency of two sections of buses, frequency mutation, two sections of under \ over-voltage, voltage harmonic, positive sequence component direction locking and the like. The principle of passive island detection is shown in fig. 2-7, and under \ over-frequency and under \ over-voltage logics of a bus at the section II are the same as those at the section I.

Description of the drawings:

1) the frequency response and the voltage response characteristic of the island detection meet the requirements of 'technical regulation for accessing distributed generation into a power grid' of a national power grid Q/GDW, and the action time of each section is matched with the action time of a low-voltage circuit breaker.

2) The frequency and harmonic criteria must satisfy the conditions for voltage establishment.

3) The sensitive angle of the locking element in the positive sequence component direction is 210 degrees, and the locking area is 150 degrees to 270 degrees. If the current positive sequence voltage is less than 10V, adopting a memory voltage, and taking a positive sequence voltage value 2 weeks before; and if the current positive sequence voltage is greater than 10V, calculating the positive sequence reverse direction by using the current positive sequence voltage. The voltage threshold of the direction element is 2V, and the current threshold is a positive sequence component current constant value. The positive sequence component direction blocking element is characterized as shown in the figure, and the blocking area is a hatched half-sector range.

The motion characteristics of the inlet line in the positive sequence and the reverse direction are shown in fig. 2-8, the critical motion conditions are two straight lines passing through the origin, and the motion area is a half-sector range with a shadow line.

The device has reverse power protection

The device is provided with reverse power protection, the reverse power protection prohibits power transmission to the public power grid, and the device acts when detecting that a grid-connected point generates power to the public power grid, and does not act otherwise. The protection detects secondary A-phase power to judge, the soft pressing plate and the switching control word are switched on and off, and the protection is switched on only when the soft pressing plate and the switching control word are switched on. The protection can be selected to act on tripping or alarming, and the value meaning of the trip control fixed value is as follows:

quitting at 0: 1-2: throwing-1: tripping and alarming at 2: alarming.

System power-off protection

1) All line voltages Uab, Uac and Ubc are less than 50V;

2) sampling currents ia, ib and ic are all less than 0.2A;

3) closing position of circuit breaker

4) The system voltage flag is 1 (when all line voltages of the system voltage are greater than or equal to 50V, the voltage flag is set to 1, and the flag is cleared when a partial signal is detected);

if the above conditions are met, the tripping relay is immediately driven, and the accident signal relay is also driven at the same time. The liquid crystal displays the action name, and the panel accident lamp is on. The liquid crystal displays the action name, and the panel accident lamp is on.

1.10 external ganghop

The open volume of the external connection jump 1 and the external connection jump 2 has signals,

if the above conditions are met, the tripping relay is immediately driven, and the accident signal relay is also driven at the same time. The liquid crystal displays the action name, and the panel accident lamp is on. The liquid crystal displays the action name, and the panel accident lamp is on.

1.11 alarm trip of circuit breaker

When the circuit breaker is in fault, its alarm contact is closed, and when the input quantity is in signal, it can immediately drive trip relay, at the same time also drive accident signal relay, and the action name is displayed by liquid crystal display, and the panel accident lamp is lighted

2. Auxiliary functions

2.1TV anomaly detection

1) Bus TV exception:

bus TV anomaly detection can be turned on and off by control words. When protection is enabled, the bus TV is locked for anomaly detection.

The bus TV disconnection criterion is as follows:

(1) the positive sequence voltage of the bus is less than 0.3 times of the rated line voltage of the bus, and the incoming line of the side is in a closed position or has current;

(2) the negative sequence voltage of the bus is more than 8V;

if any condition is met, the time is delayed for 10s, the bus TV is reported to be abnormal, and the width is widened for 10 s.

2) Incoming line TV exception:

incoming line TV anomaly detection can be thrown or withdrawn with control words. The incoming line TV anomaly criterion is as follows: the incoming line voltage is less than 0.3 time of the rated line voltage of the line, the incoming line is in a closed position or has current, and the line TV abnormity is reported after 10 seconds. The situation is not met, and the incoming line TV returns abnormally after 10 s.

And sending an alarm signal after the bus TV is abnormal and the incoming line TV is abnormal.

2.2 control Loop Exception Warning

When the control loop is subjected to abnormal self-detection in parameter setting (configured in a menu 'parameter setting' → 'system control word 1'), when the control power supply is normal and the auxiliary contact at the position of the circuit breaker is normal, only one jump position or closed position is opened, and otherwise, an abnormal alarm signal of the control loop is reported after 2s delay. The alarm signal can not be returned until the position is correct for 1s, and the alarm signal can not be reset by pressing a reset key.

When a plurality of electrical components are brazed on the circuit board 3 and then are installed in the square cabinet body 2, the transverse pull rod 7 is pulled firstly, the transverse pull rod 7 drives the circular stabilizing plate 8 to move, the circular stabilizing plate 8 drives the telescopic spring to move, at the moment, the telescopic spring is compressed to generate elasticity, after the circular stabilizing plate 8 moves to a certain distance, the square connecting block 9 is placed in the square installing groove 6, the transverse pull rod 7 is loosened, the circular stabilizing plate 8 is clamped into the circular clamping groove under the action of the telescopic spring, and then the circuit board 3 is preliminarily stabilized;

then start hydraulic cylinder 402, the output shaft of hydraulic cylinder 402 drives L type box 4 and removes, closes hydraulic cylinder 402 after L type box 4 contacts with the top of circuit board 3, then starts air-cooler 401, can in time distribute away when a plurality of electrical components during operation produce the heat, avoids the condition of short circuit to appear.

The utility model can adopt a full-sealed structure, and has good shock resistance and dust resistance;

the utility model has the advantages of small size, light weight, beautiful appearance and convenient installation;

the utility model can adopt unique reliability design, has no adjustable element, good stability and strong anti-interference performance;

the utility model can realize full Hanhua liquid crystal display, the human-computer interface is clear and easy to understand, and the operation setting is very convenient;

the utility model can be provided with a power supply and a control loop which are both AC and DC;

the utility model can be provided with an RS485 bus serial communication port and integrates an MODBUS standard communication protocol;

the utility model can have the function of recording the sequence of events, can record 150 events, and can not lose when the data is lost;

the utility model discloses can possess perfect self-checking function, complete abnormal record, incident record, operation record, all information fall the power failure and keep;

the utility model discloses can the appearance small and exquisite meticulous, rational in infrastructure, adopt high-grade, high-quality components and parts and multiply wood technique and SMT technology, make the product have very high electrical performance.

It should be noted that the device structure and the accompanying drawings of the present invention mainly describe the principle of the present invention, and in the design principle, the settings of the power mechanism, the power supply system, the control system, etc. of the device are not completely described, and on the premise that the skilled person understands the principle of the present invention, the details of the power mechanism, the power supply system, and the control system can be clearly known, the control mode of the application file is automatically controlled by the controller, and the control circuit of the controller can be realized by simple programming of the skilled person in the art;

the standard parts used in the method can be purchased from the market, and can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as mature bolts, rivets, welding and the like in the prior art, the machines, parts and equipment adopt conventional models in the prior art, and the structure and the principle of the parts known by the skilled person can be known by technical manuals or conventional experimental methods.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, and it is intended that in other related fields of technology, the scope of the invention be limited only by the claims and their equivalents, all of which are included within the scope of the present invention as defined in the appended claims.

Claims (8)

1. An anti-islanding protection device is characterized by comprising a square cabinet body arranged on one side of a square wall pasting board, wherein a stepped connecting plate is fixedly arranged on one side, close to the square wall pasting board, of the square cabinet body, the stepped connecting plate is arranged on the square wall pasting board, a square cabinet door is arranged on the square cabinet body, a liquid crystal display screen and a plurality of first buttons are arranged on the square cabinet door, and a stabilizing mechanism and a heat dissipation mechanism are arranged in the square cabinet body;

the stabilizing mechanism is including the circuit board, the circuit board sets up at square cabinet internally, fixed mounting has square connecting plate on the bottom inner wall of the square cabinet body, square mounting groove has been seted up at the top of square connecting plate, be equipped with square connecting block in the square mounting groove, the top of square connecting block extend to outside the square mounting groove and with the bottom fixed connection of circuit board, slidable mounting has two horizontal pull rods in the square mounting groove, and the one end that two horizontal pull rods kept away from each other all extends to outside the square mounting groove, the one end fixed mounting that horizontal pull rod is close to square connecting block has circular stabilizing plate, circular draw-in groove has all been seted up to the both sides of square connecting block, circular draw-in groove and the circular stabilizing plate looks adaptation that corresponds.

2. The anti-islanding protection device according to claim 1, wherein the heat dissipation mechanism comprises an L-shaped box body, the L-shaped box body is arranged on the circuit board, an air cooler is arranged on the L-shaped box body, a hydraulic cylinder is fixedly mounted on the inner wall of the top of the square cabinet body, and an output shaft of the hydraulic cylinder is fixedly connected with the L-shaped box body.

3. The anti-islanding protection device according to claim 1, wherein a stepped mounting groove is formed in one side, close to the stepped connecting plate, of the square wall pasting plate, and the stepped mounting groove is matched with the stepped connecting plate.

4. The anti-islanding protection device according to claim 1, wherein the transverse pull rod is slidably sleeved with a telescopic spring, one end of the telescopic spring is fixedly connected with the circular stabilizing plate, the other end of the telescopic spring is fixedly connected with an inner wall of one side of the square mounting groove, circular connecting holes are formed in inner walls of two sides of the square mounting groove, and the circular connecting holes are slidably connected with the corresponding transverse pull rod.

5. The anti-islanding protection device according to claim 1, wherein the square wall panel is provided with four first screws, and the square wall panel is fixedly mounted on a wall surface through the four first screws.

6. The anti-islanding protection device according to claim 1, wherein two hinges are arranged on the square cabinet body, and the square cabinet body is connected with the square cabinet door through the two hinges.

7. The anti-islanding protection device according to claim 1, wherein a CPU plug-in, an AC sampling plug-in, a DIDO plug-in and a man-machine conversation HMI plug-in are arranged on the circuit board.

8. The anti-islanding protection device according to claim 1, wherein a plurality of balls are nested at the bottom of the square connecting block, and the balls are in sliding connection with the inner wall of the bottom of the square mounting groove.

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