CN210468779U - Power-off tripping device of medium-voltage ring main unit - Google Patents
Power-off tripping device of medium-voltage ring main unit Download PDFInfo
- Publication number
- CN210468779U CN210468779U CN201921216686.2U CN201921216686U CN210468779U CN 210468779 U CN210468779 U CN 210468779U CN 201921216686 U CN201921216686 U CN 201921216686U CN 210468779 U CN210468779 U CN 210468779U
- Authority
- CN
- China
- Prior art keywords
- main unit
- ring main
- power supply
- power
- super capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a wind power control field discloses a medium voltage ring main unit power-off tripping device, including super capacitor group, charging circuit, discharging circuit, mains voltage detection circuit, the utility model discloses a medium voltage ring main unit power-off tripping device, this medium voltage ring main unit power-off tripping device regards super capacitor group as the back-up power; when the ring main unit is in a normal operation state, the external control power supply provides an operation power supply for the ring main unit control loop; the ring main unit control power supply can charge the super capacitor bank through the charging loop; meanwhile, the relay ZJ is electrified and closed to monitor the power supply voltage of the operation loop; when the ring main unit control power supply fails and loses power suddenly, the relay ZJ loses power, the power supply voltage detection circuit is connected with the discharge circuit of the super capacitor bank, the super capacitor bank supplies power to the trip coil TQ2 through the discharge outlet Vout +, the main circuit breaker QF is driven to trip, and the electrical connection between the wind driven generator and the power system is cut off, so that the power-losing trip protection effect is achieved.
Description
Technical Field
The utility model relates to a wind-powered electricity generation control field especially relates to middling pressure looped netowrk cabinet tripping device that loses electricity.
Background
In the field of wind power generation, the voltage generated by a traditional wind driven generator is 0.69kV, a secondary boosting mode is adopted, namely a 35kV box-type boosting transformer is configured outside each fan tower, the voltage is boosted to 35kV firstly, the box-type boosting transformer is converged by a current collecting circuit, then the box-type boosting transformer is connected to a 110kV or 220kV boosting station of a wind power plant, and the box-type boosting transformer is converged by secondary boosting and then is connected to a power system.
The boosting mode needs to transmit 0.69kV electric energy generated by the fan to a 35kV boosting transformer through a low-voltage power cable which is as long as hundreds of meters or even hundreds of meters, the line loss caused by the gradual increase of the installed capacity is increased, and the operation mode is not economical. At present, a new development trend is that a step-up transformer is directly installed nearby a generator at the top of a tower, and a ring main unit is installed to the middle or the bottom in the tower. 0.69kV electric energy that the fan sent directly steps up to 35kV, and high-pressure transmission reaches the looped netowrk cabinet in the tower section of thick bamboo, converges the back through the looped netowrk cabinet and conveys 35kV electric energy to wind power plant 110kV or 220kV booster station, converges into electric power system after stepping up again, has played fine energy-conserving effect like this. On the other hand, the power consumption of a control loop and a signal loop inside the fan and the ring main unit is optimized, and the power supply is changed from 220V or 110V to 24V, so that the power consumption is further reduced.
The ring main unit serves as intermediate electrical equipment for connecting the wind driven generator and the power system, and the built-in high-voltage switch equipment can play a role in protection, and can cut off the connection between the wind driven generator and the power system when the power system fails, so that safety accidents are avoided; for example, the utility model with publication number CN202454900U is a similar ring main unit.
However, the high-voltage switch equipment needs to be powered by an external control power supply of the ring main unit in the operation process; if the control power supply loses power due to faults, the high-voltage switch equipment is out of control, safe operation cannot be carried out, and great potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's shortcoming, provide a middling pressure looped netowrk cabinet loses electric tripping device, have looped netowrk cabinet control power supply and lose automatic tripping protect function behind the electricity.
In order to solve the technical problem, the utility model discloses a following technical scheme can solve:
a medium voltage ring main unit power-off tripping device comprises
The super capacitor bank comprises a charging inlet Vin +, a discharging outlet Vout +, and a ground terminal GND, wherein the ground terminal GND is connected with a negative electrode KM-of the ring main unit control power supply;
the charging loop comprises a resistor R, one end of the resistor R is connected to the anode KM + of the ring main unit control power supply, and the other end of the resistor R is connected to a charging inlet Vin + of the super capacitor bank;
the discharging loop comprises a normally-open auxiliary contact QF2 and a tripping coil TQ2 of the circuit breaker, one end of the normally-open auxiliary contact QF2 is connected to a discharging outlet Vout + of the super capacitor bank, the other end of the normally-open auxiliary contact QF2 is connected to one end of the tripping coil TQ2, and the other end of the tripping coil TQ2 is connected to a negative electrode KM-of the control power supply of the ring main unit; the trip coil TQ2 drives and controls the opening operation of the main circuit breaker QF so as to disconnect the connection between the wind driven generator and the power system;
the power supply voltage detection circuit comprises a relay ZJ, wherein coils of the relay ZJ are connected in parallel with two ends of a ring main unit control power supply, and a normally closed contact ZJ-1 of the relay ZJ is connected in series with a circuit where a discharge circuit is located.
By adopting the scheme, the power-loss tripping device of the medium-voltage ring main unit takes the super capacitor bank as a backup power supply; when the ring main unit is in a normal operation state, the external control power supply provides an operation power supply for the ring main unit control loop; the ring main unit control power supply can charge the super capacitor bank through the charging loop; meanwhile, the relay ZJ is electrified and closed to monitor the power supply voltage of the operation loop; when the ring main unit control power supply fails and loses power suddenly, the relay ZJ loses power, the power supply voltage detection circuit is connected with the discharge circuit of the super capacitor bank, and the super capacitor bank supplies power to the trip coil TQ2 through the discharge outlet Vout +, so that the main circuit breaker QF is driven to trip, the electrical connection between the wind driven generator and the power system is cut off, and the power-losing trip protection effect is further achieved.
Preferably, the online monitoring circuit also comprises a super capacitor bank online monitoring circuit, wherein the super capacitor bank online monitoring circuit comprises a normally open auxiliary contact QF1 of the circuit breaker, a relay K and an indicating element, the normally open auxiliary contact QF1 is connected with a coil of the relay K in series, and the other end of the normally open auxiliary contact QF1 and the other end of the coil of the relay K are connected with two ends of the resistor R in parallel; one end of a normally open contact K-1 of the relay K is connected with the anode KM + of the ring main unit control power supply, the other end of the normally open contact K-1 is connected with one end of an indicating element, and the other end of the indicating element is connected with the cathode KM-of the ring main unit control power supply.
By adopting the scheme, the quality of the super capacitor bank is gradually reduced along with the increase of the service life, so that the generated leakage current is increased along with the reduction of the quality of the capacitor after the super capacitor bank is fully charged; therefore, the two ends of the resistor R are connected with the online monitoring loop of the super capacitor bank in parallel, when the ring main unit control power supply is in a normal operation state, the normally open auxiliary contact QF1 is in a closed state, and the online monitoring loop of the super capacitor bank is conducted; if the quality of the super capacitor bank is in a good state, the leakage current generated after the super capacitor bank is fully charged is small and is not enough to drive a coil of the relay K, so that a normally open contact K-1 of the relay K is disconnected to cut off a power supply loop of the indicating element, and the indicating element stops working; on the contrary, if the quality of the supercapacitor bank is seriously reduced, the leakage current generated after the supercapacitor bank is fully charged is large, the coil of the relay K can be driven to be electrified and attracted, the normally open contact K-1 of the relay K is closed, and the power supply loop of the indicating element is switched on, so that the indicating element sends an alarm signal, the service life of the supercapacitor bank is reminded of a user to be exhausted, the supercapacitor bank needs to be replaced, and the supercapacitor bank is more humanized.
Preferably, the indicator element is an indicator lamp HD.
By adopting the scheme, the indicating lamp is striking, corresponding prompt information can be timely provided when the user needs to check, and the device is more humanized.
The utility model discloses owing to adopted above technical scheme, have apparent technological effect: the medium-voltage ring main unit power-off tripping device takes a super capacitor bank as a backup power supply; when the ring main unit is in a normal operation state, the external control power supply provides an operation power supply for the ring main unit control loop; the ring main unit control power supply can charge the super capacitor bank through the charging loop; meanwhile, the relay ZJ is electrified and closed to monitor the power supply voltage of the operation loop; when the ring main unit control power supply fails and loses power suddenly, the relay ZJ loses power, the power supply voltage detection circuit is connected with the discharge circuit of the super capacitor bank, and the super capacitor bank supplies power to the trip coil TQ2 through the discharge outlet Vout +, so that the main circuit breaker QF is driven to trip, the electrical connection between the wind driven generator and the power system is cut off, and the power-losing trip protection effect is further achieved.
Drawings
FIG. 1 is a circuit diagram of the first embodiment;
FIG. 2 is a circuit diagram of a second embodiment;
fig. 3 is a system architecture diagram of the second embodiment.
The names of the parts indicated by the numerical references in the above figures are as follows: 1. a supercapacitor bank; 2. a current monitoring module; 3. a control module; 4. a display module; 5. and an alarm module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example one
As shown in fig. 1, the power-loss trip device for the medium-voltage ring main unit disclosed in this embodiment includes a super capacitor bank 1, a charging loop, a discharging loop, and a power voltage detection loop.
More specifically, the super capacitor bank 1 comprises a charging inlet Vin +, a discharging outlet Vout +, and a ground terminal GND, wherein the ground terminal GND is connected to a negative electrode KM-of the ring main unit control power supply; wherein, the looped netowrk cabinet control power supply is 24V DC power supply for the looped netowrk cabinet power supply. The charging loop comprises a resistor R, one end of the resistor R is connected with the anode KM + of the ring main unit control power supply, the other end of the resistor R is connected with a charging inlet Vin + of the super capacitor bank 1, and the resistor R is a current-limiting resistor; the discharging loop comprises a normally-open auxiliary contact QF2 and a tripping coil TQ2 of the circuit breaker, one end of the normally-open auxiliary contact QF2 is connected to a discharging outlet Vout + of the super capacitor bank 1, the other end of the normally-open auxiliary contact QF2 is connected to one end of the tripping coil TQ2, and the other end of the tripping coil TQ2 is connected to a negative electrode KM-of the control power supply of the ring main unit; the trip coil TQ2 drives and controls the opening operation of the main circuit breaker QF so as to disconnect the connection between the wind driven generator and the power system; it can be understood that the main circuit breaker QF is controlled by the trip coil TQ2 to act, i.e. when the trip coil TQ2 is in an energized state, it can control the main circuit breaker QF to open to cut off the connection between the wind turbine and the power system. Because the trip coil TQ2 belongs to the opening coil integrated in the bistable circuit breaker QF, only an electric pulse needs to be sent to the trip coil TQ2, the main circuit breaker QF can be disconnected and maintained in the disconnected state; the wind power generator is not re-closed unless a closing coil (not shown) integrated in the same bistable circuit breaker receives a closing electric pulse, and is maintained in a closed state so as to restore the connection between the wind power generator and the power system. The power supply voltage detection circuit comprises a relay ZJ, coils of the relay ZJ are connected in parallel to two ends of the ring main unit control power supply, and a normally closed contact ZJ-1 of the relay ZJ is connected in series with a circuit where the discharge circuit is located.
Furthermore, the medium-voltage ring main unit power-off tripping device further comprises a super capacitor bank online monitoring loop, the super capacitor bank online monitoring loop comprises a normally-open auxiliary contact QF1 of the circuit breaker, a relay K and an indicating element, and the indicating element is an indicating lamp HD. The normally open auxiliary contact QF1 is connected with the coil of the relay K in series, and the other end of the normally open auxiliary contact QF1 and the other end of the coil of the relay K are connected with the two ends of the resistor R in parallel; one end of a normally open contact K-1 of the relay K is connected with the anode KM + of the ring main unit control power supply, the other end of the normally open contact K-1 is connected with one end of an indicating element, and the other end of the indicating element is connected with the cathode KM-of the ring main unit control power supply.
In the above circuit connection relationship, the normally open auxiliary contact QF1 and the normally open auxiliary contact QF2 are both auxiliary contacts of the bistable circuit breaker QF, and are controlled by built-in coils (closing coil and opening coil) of the bistable circuit breaker. When the ring main unit is in a closing state, the normally-open auxiliary contact QF1 and the normally-open auxiliary contact QF2 of the bistable circuit breaker QF can be synchronously closed; on the contrary, when the ring main unit is in the open state, the normally open auxiliary contacts QF1 and QF2 of the bistable circuit breaker QF can be opened synchronously, which is well known in the art and will not be described in detail herein. The types of components in the circuit connection relationship may be selected according to actual use, and will not be described in detail here.
The operation principle of the above circuit connection relationship will now be described in detail with reference to the accompanying drawings:
after the ring main unit control power supply KM is electrified, the ring main unit control power supply KM can quickly charge the super capacitor bank 1 through the current limiting resistor R. The main charging mode can be completed within 2-3 seconds, then the floating charging state is automatically switched, and the magnitude of the floating charging current is the same as that of the leakage current of the super capacitor bank 1; meanwhile, the relay ZJ is electrified and closed, and the corresponding normally closed contact ZJ-1 is disconnected. After the ring main unit is switched on, the main circuit breaker QF is switched from an opening state to a closing state, so that the wind driven generator transmits power to the power system. Meanwhile, the normally open auxiliary contacts QF1 and QF2 of the breaker QF are also turned to a closed state from an open state. At the moment, the ring main unit control power supply KM carries out floating charging on the super capacitor bank 1 through the parallel connection of the current-limiting resistor R and the super capacitor bank online monitoring loop, and the super capacitor bank online monitoring loop is formed by serially connecting a normally-open auxiliary contact QF1 and a coil of a relay K.
On the contrary, if the ring main unit control power supply KM loses power due to a fault, the coil of the relay ZJ loses power and resets, the corresponding normally closed contact ZJ-1 is closed again, the discharging loop of the discharging outlet Vout + of the super capacitor bank 1 is switched on, and the discharging loop supplies power to the tripping coil TQ2, so that the tripping coil TQ2 is powered on to start the main circuit breaker QF to open the brake, thereby cutting off the connection between the wind driven generator and the power system and ensuring the safety of the power system and the wind driven generator.
Regarding the working principle of the on-line monitoring loop of the super capacitor bank, after the super capacitor bank 1 is fully charged, if the quality of the super capacitor bank 1 is in a good state, the generated leakage current is small and is not enough to drive a coil of a relay K, so that a normally open contact K-1 of the relay K is disconnected, a power supply loop of an indicating element is cut off, and the indicating element stops working; on the contrary, if the quality of the supercapacitor bank 1 is seriously reduced, the leakage current generated after the supercapacitor bank 1 is fully charged is large, the coil of the relay K can be driven to suck, the normally open contact K-1 of the relay K is closed, and the power supply loop of the indicating element is switched on, so that the indicating element sends a prompt signal, and the service life of the supercapacitor bank 1 is reminded of a user to be exhausted, needs to be replaced, and is more humanized.
Example two
As shown in fig. 2 and fig. 3, on the basis of the first embodiment, the on-line monitoring loop of the supercapacitor bank is further connected to a current monitoring module 2, and the current monitoring module 2 is preferably a digital current meter; the current monitoring module 2 is connected with a control module 3, and the control module 3 is a chip or a device with data processing capability, including but not limited to a single chip microcomputer, a PLC, a CPU, a MCU, an ARM and the like. The control module 3 is connected with a display module 4, and the display module 4 is preferably a liquid crystal display or a touch screen. More specifically, the control module 3 includes a buffer and is preset with a maximum leakage current value Imax; this maximum leakage current value Imax corresponds to the leakage current value that occurs when the service life of the supercapacitor group 1 is exhausted. The current monitoring module 2 is used for detecting the current value of the online monitoring loop of the super capacitor bank, sending the obtained current value to a buffer in the control module 3 for storage, and generating a detection time point of the current value data; the control module 3 calculates a current change rate lambda of an online monitoring loop of the super capacitor bank according to the variation and the time interval of the current value stored in the buffer, then calculates a current difference value delta I between the maximum leakage current value Imax and the current value stored in the buffer at the last time, finally calculates the remaining service life T of the super capacitor bank 1 according to the current difference value delta I and the current change rate lambda, and the control module 3 sends the calculated remaining service life T to the display module 4 for displaying. The user can know the remaining service life of the supercapacitor pack 1 according to the value of the remaining service life T shown in the display module 4, so as to make preparation for replacing the supercapacitor pack 1 in advance.
Furthermore, the control module 3 is further connected with a warning module 5, and the warning module 5 is preferably a sounding alarm circuit. When the control module 3 monitors that the current value stored in the buffer is larger than or equal to the maximum leakage current value Imax, the control module 3 controls the warning module 5 to give an alarm, namely, the control module reminds a user that the service life of the supercapacitor bank 1 reaches the upper limit in a mode of sending out warning sound and needs to be replaced in time.
EXAMPLE III
On the basis of the second embodiment, the current change rate λ is calculated by: the latest measured current value in the buffer is differed from the last measured current value by the control module 3 to obtain a current difference value delta i, and the time interval delta t between the detection time points corresponding to the two current values is calculated according to the control module 3; calculating the value of the current change rate lambda through a formula lambda, namely delta i/delta t;
the current difference value delta I is calculated by the following method: the maximum leakage current value Imax is differed from the latest measured current value in the buffer by the control module 3, and a current difference value delta I is calculated;
the method for calculating the residual service life T of the supercapacitor bank 1 comprises the following steps: the value of the remaining use period T of the supercapacitor group 1 is calculated by the formula T ═ Δ I/λ.
Claims (3)
1. The utility model provides a medium voltage looped netowrk cabinet loses electric trip gear which characterized in that: comprises that
The super capacitor bank (1) comprises a charging inlet Vin +, a discharging outlet Vout +, and a grounding end GND, wherein the grounding end GND is connected with a negative electrode KM-of the ring main unit control power supply;
the charging loop comprises a resistor R, one end of the resistor R is connected to the anode KM + of the ring main unit control power supply, and the other end of the resistor R is connected to a charging inlet Vin + of the super capacitor bank (1);
the discharging loop comprises a normally-open auxiliary contact QF2 and a tripping coil TQ2 of the circuit breaker, one end of the normally-open auxiliary contact QF2 is connected to a discharging outlet Vout + of the super capacitor bank (1), the other end of the normally-open auxiliary contact QF2 is connected to one end of the tripping coil TQ2, and the other end of the tripping coil TQ2 is connected to a negative electrode KM-of the control power supply of the ring main unit; the trip coil TQ2 drives and controls the opening operation of the main circuit breaker QF so as to disconnect the connection between the wind driven generator and the power system;
the power supply voltage detection circuit comprises a relay ZJ, wherein coils of the relay ZJ are connected in parallel with two ends of a ring main unit control power supply, and a normally closed contact ZJ-1 of the relay ZJ is connected in series with a circuit where a discharge circuit is located.
2. The medium voltage ring main unit power-loss tripping device of claim 1, characterized in that: the online monitoring circuit of the super capacitor bank comprises a normally open auxiliary contact QF1 of the circuit breaker, a relay K and an indicating element, wherein the normally open auxiliary contact QF1 is connected with a coil of the relay K in series, and the other end of the normally open auxiliary contact QF1 and the other end of the coil of the relay K are connected with two ends of a resistor R in parallel; one end of a normally open contact K-1 of the relay K is connected with the anode KM + of the ring main unit control power supply, the other end of the normally open contact K-1 is connected with one end of an indicating element, and the other end of the indicating element is connected with the cathode KM-of the ring main unit control power supply.
3. The medium voltage ring main unit power-off tripping device of claim 2, characterized in that: the indicating element is an indicator lamp HD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921216686.2U CN210468779U (en) | 2019-07-31 | 2019-07-31 | Power-off tripping device of medium-voltage ring main unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921216686.2U CN210468779U (en) | 2019-07-31 | 2019-07-31 | Power-off tripping device of medium-voltage ring main unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210468779U true CN210468779U (en) | 2020-05-05 |
Family
ID=70448675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921216686.2U Active CN210468779U (en) | 2019-07-31 | 2019-07-31 | Power-off tripping device of medium-voltage ring main unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210468779U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504657A (en) * | 2019-07-31 | 2019-11-26 | 宁波天安（集团）股份有限公司 | Middle pressure ring network cabinet power failure tripping device |
-
2019
- 2019-07-31 CN CN201921216686.2U patent/CN210468779U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504657A (en) * | 2019-07-31 | 2019-11-26 | 宁波天安（集团）股份有限公司 | Middle pressure ring network cabinet power failure tripping device |
| CN110504657B (en) * | 2019-07-31 | 2023-12-08 | 宁波天安（集团）股份有限公司 | Medium-voltage ring main unit power-failure tripping device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109217673A (en) | A kind of energy accumulation current converter and its control method | |
| CN102664454B (en) | Non-floating charging type substation direct current power supply system based on iron lithium battery | |
| CN101309003A (en) | Synthetic apparatus of anti-flashover and protection for low-voltage three phase asynchronous motor | |
| CN205749687U (en) | A kind of wind electricity change paddle super capacitor capacity checking apparatus | |
| WO2009030101A1 (en) | Online passive maintaining device for large capacity sealed lead-acid accumulator | |
| CN106786831A (en) | A kind of ups power electric quantity acquisition and control system | |
| CN112462289A (en) | Storage battery pack online capacity checking management device | |
| CN108983104B (en) | Online capacity calculation method based on battery open circuit voltage method | |
| CN101764426A (en) | Protective device for on-line discharge capacity test of storage battery and testing method thereof | |
| CN210468779U (en) | Power-off tripping device of medium-voltage ring main unit | |
| CN108983029A (en) | A kind of method of on-line checking electric system battery group open circuit | |
| CN104901326A (en) | Control rod drive mechanism static power supply system and energy storage system and power supply method thereof | |
| CN103151790A (en) | Intelligent power supply system of peak moving and valley filling | |
| CN101762788A (en) | Storage battery operation monitoring system | |
| CN110504657B (en) | Medium-voltage ring main unit power-failure tripping device | |
| CN103474987B (en) | Electric transmission line on-line monitoring device energy obtaining system based on ground wire induction | |
| CN204694790U (en) | A kind of Hall element fault monitoring device being applicable to nuclear power plant's ups system | |
| CN105428732B (en) | A kind of device and method of on-line maintenance valve controlled sealed lead-acid accumulator | |
| CN211287956U (en) | Power supply unit that water supply network check out test set used | |
| CN116526653A (en) | Portable parallel emergency power supply device, monitoring system and emergency online capacity checking method | |
| CN204481544U (en) | A kind of wireless charging device for transmission line on-line monitoring equipment | |
| CN216563283U (en) | Online self-maintenance system for storage battery | |
| CN202550664U (en) | Direct current power supply system of non-floating charge type transformer substation based on lithium iron battery | |
| CN201528182U (en) | Maintenance free high voltage reclosing controller without PT | |
| CN107979166A (en) | A kind of power switch operation power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |