CN110504657B - Medium-voltage ring main unit power-failure tripping device - Google Patents
Medium-voltage ring main unit power-failure tripping device Download PDFInfo
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- CN110504657B CN110504657B CN201910697757.3A CN201910697757A CN110504657B CN 110504657 B CN110504657 B CN 110504657B CN 201910697757 A CN201910697757 A CN 201910697757A CN 110504657 B CN110504657 B CN 110504657B
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- 239000003990 capacitor Substances 0.000 claims abstract description 38
- 238000012544 monitoring process Methods 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 3
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- 238000004364 calculation method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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Abstract
The utility model relates to the field of wind power control and discloses a medium-voltage ring main unit power-losing tripping device which comprises a super capacitor bank, a charging loop, a discharging loop and a power supply voltage detection loop, wherein the super capacitor bank is used as a backup power supply; when the ring main unit is in a normal running state, an external control power supply provides an operation power supply for a 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 used for monitoring the power supply voltage of the operation loop through electrified suction; when the control power supply of the ring main unit fails and suddenly loses power, the relay ZJ loses power, the power supply voltage detection loop is connected with the discharge loop of the supercapacitor set, the supercapacitor set supplies power to the tripping 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 as to play a role in losing power tripping protection.
Description
Technical Field
The utility model relates to the field of wind power control, in particular to a medium-voltage ring main unit power-losing tripping device.
Background
In the field of wind power generation, the voltage generated by a traditional wind power generator is 0.69kV, a secondary boosting mode is adopted, namely, a 35kV box type boosting transformer is arranged outside each fan tower, the voltage is firstly boosted to 35kV, and after the current is converged through a current collecting circuit, the voltage is then connected into a 110kV or 220kV booster station of a wind power plant, and after the secondary boosting, the voltage is converged into a power system.
The boosting mode needs to send 0.69kV electric energy emitted by the fan to 35kV boosting transformer through a power cable with the length of hundreds of meters or even hundreds of meters, and the line loss caused by the gradual increase of the installed capacity is increased, so that the operation mode is very uneconomical. At present, a new development trend is that a step-up transformer is directly and nearby arranged beside a generator at the top of a tower, and a ring main unit is arranged at the middle part or the bottom in the tower. The 0.69kV electric energy sent by the fan is directly boosted to 35kV, the high-voltage transmission is carried out to the ring main unit in the tower barrel, the 35kV electric energy is transmitted to a 110kV or 220kV booster station of the wind power plant after being converged through the ring main unit, and the electric energy is converged into the electric power system after being boosted, so that a good energy-saving effect is achieved. On the other hand, the power consumption of a control loop and a signal loop in the fan and the ring main unit is optimized, and the control power supply is changed from 220V or 110V to 24V power supply to supply power, so that the power consumption is further reduced.
The ring main unit is used 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, so that when the power system fails, the connection between the wind driven generator and the power system can be cut off, and safety accidents are avoided; the utility model patent with publication number of CN202454900U is a 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 and cannot be operated safely, and a large potential safety hazard exists.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a medium-voltage ring main unit power-losing tripping device which has an automatic tripping protection function after the ring main unit control power supply is in power failure.
In order to solve the technical problems, the utility model is solved by the following technical scheme:
a medium-voltage ring main unit power-losing tripping device comprises
The super capacitor bank comprises a charging inlet Vin+, a discharging outlet Vout+ and a grounding end GND, wherein the grounding end GND is connected with a negative pole KM-of a ring main unit control power supply;
the charging loop comprises a resistor R, one end of the resistor R is connected with a positive pole KM+ of a ring main unit control power supply, and the other end of the resistor R is connected with 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 with a discharging outlet Vout+ of the supercapacitor group, the other end of the normally open auxiliary contact QF2 is connected with one end of the tripping coil TQ2, and the other end of the tripping coil TQ2 is connected with a negative pole KM-of a control power supply of the ring main unit; the device also comprises a main circuit breaker QF connected between the wind driven generator and the power system, and a tripping coil TQ2 drives and controls the opening operation of the main circuit breaker QF so as to disconnect the wind driven generator from the power system;
the power supply voltage detection loop comprises a relay ZJ, wherein a coil of the relay ZJ is connected in parallel with two ends of a control power supply of the ring main unit, and a normally closed contact ZJ-1 of the relay ZJ is connected in series with a loop where the discharge loop is located.
By adopting the scheme, the medium-voltage ring main unit power-loss tripping device takes the super capacitor bank as a backup power supply; when the ring main unit is in a normal running state, an 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 used for monitoring the power supply voltage of the operation loop through electrified suction; when the ring main unit control power supply fails and suddenly loses power, the relay ZJ loses power, the power supply voltage detection loop is connected with the discharge loop of the supercapacitor group, and the supercapacitor group supplies power to the tripping 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 further the power-losing tripping protection function is achieved.
Preferably, the on-line monitoring circuit of the super capacitor bank further 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 a positive pole KM+ of a 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 a negative pole KM-of the ring main unit control power supply.
By adopting the scheme, the quality of the super capacitor bank gradually decreases along with the increase of the using time, so that the leakage current generated by the super capacitor bank increases along with the decrease 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, and when the ring main unit control power supply is in a normal running state, the normally open auxiliary contact QF1 is in a closed state, so that 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 generated leakage current is small after the super capacitor bank is fully charged, and the leakage current is insufficient 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; otherwise, if the quality of the super capacitor bank is seriously reduced, the generated leakage current is larger after the super capacitor bank is fully charged, and the coil of the relay K can be driven to be electrified and attracted at the moment, so that the normally open contact K-1 of the relay K is closed, the power supply loop of the indicating element is connected, the indicating element sends an alarm signal, and a user is reminded that the service life of the super capacitor bank is about to be exhausted and needs to be replaced, so that the super capacitor bank is more humanized.
Preferably, the indicator element is an indicator lamp HD.
By adopting the scheme, the indicator lamp is more striking, can provide corresponding prompt information in time when a user needs to check, and is more humanized.
Preferably, the on-line monitoring loop of the supercapacitor group is also connected with a current monitoring module, the current monitoring module is connected with a control module, and the control module is connected with a display module; the control module comprises a buffer and is preset with a maximum leakage current value Imax; the current monitoring module is used for detecting the current value of the online monitoring loop of the supercapacitor group, sending the obtained current value to a buffer in the control module for storage, and generating a detection time point of the current value data; the control module calculates the current change rate lambda of the online monitoring loop of the supercapacitor group according to the change quantity and time interval of the current value stored in the buffer, then calculates the current difference delta I between the maximum leakage current value Imax and the current value stored in the buffer last time, and finally calculates the residual using time length T of the supercapacitor group according to the current difference delta I and the current change rate lambda, and the control module sends the calculated residual using time length T to the display module for display.
Preferably, the method for calculating the current change rate λ includes: the method comprises the steps that a control module is used for carrying out difference between a current value measured recently in a buffer memory and a current value measured last time to obtain a current difference value delta i, and a time interval delta t between detection time points corresponding to the two current values is calculated according to the control module; calculating the value of the current change rate lambda by the formula lambda=Δi/Δt;
the current difference delta I is calculated by the following steps: the maximum leakage current value Imax is differed from the current value measured recently in the buffer memory through the control module, and a current difference value delta I is calculated;
the calculation method of the residual using time length T of the super capacitor bank comprises the following steps: the value of the remaining in-use time length T of the supercapacitors group is calculated by the formula t=Δi/λ.
By adopting the scheme, the current monitoring module can monitor the leakage current flowing through the online monitoring loop of the super capacitor bank in real time, the residual service life of the super capacitor bank can be calculated through the operation of the control module, and the residual service life of the super capacitor bank can be known at any time by the display module for display, so that the super capacitor bank is more humanized.
Preferably, the control module is further connected with a warning module, and when the control module monitors that the current value stored in the buffer is greater than or equal to the maximum leakage current value Imax, the control module controls the warning module to give an alarm.
By adopting the scheme, when the leakage current value measured by the current monitoring module is greater than or equal to the maximum leakage current value Imax, the service life of the super capacitor bank is exhausted, and the control module can control the warning module to give an alarm so as to remind a user to replace the super capacitor bank in time, so that the use convenience is further improved.
The utility model has the remarkable technical effects due to the adoption of the technical scheme: the medium-voltage ring main unit power-loss tripping device takes a super capacitor bank as a backup power supply; when the ring main unit is in a normal running state, an 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 used for monitoring the power supply voltage of the operation loop through electrified suction; when the ring main unit control power supply fails and suddenly loses power, the relay ZJ loses power, the power supply voltage detection loop is connected with the discharge loop of the supercapacitor group, and the supercapacitor group supplies power to the tripping 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 further the power-losing tripping protection function is achieved.
Drawings
Fig. 1 is a circuit diagram of the first embodiment;
fig. 2 is a circuit schematic diagram of the second embodiment;
fig. 3 is a system architecture diagram of the second embodiment.
The names of the parts indicated by the numerical reference numerals in the above drawings are as follows: 1. a supercapacitor bank; 2. a current monitoring module; 3. a control module; 4. a display module; 5. and a warning module.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, the medium-voltage ring main unit power-loss tripping device disclosed in the embodiment includes a supercapacitor group 1, a charging circuit, a discharging circuit and a power supply voltage detection circuit.
More specifically, the supercapacitor group 1 comprises a charging inlet vin+, a discharging outlet vout+ and a grounding end GND, wherein the grounding end GND is connected to a negative pole KM-of a ring main unit control power supply; the ring main unit control power supply is a 24V direct current power supply so as to supply power for the ring main unit. The charging loop comprises a resistor R, one end of the resistor R is connected with a positive pole KM+ of a ring main unit control power supply, the other end of the resistor R is connected with a charging inlet Vin+ of the supercapacitor group 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 with a discharging outlet Vout+ of the supercapacitor group 1, the other end of the normally open auxiliary contact QF2 is connected with one end of the tripping coil TQ2, and the other end of the tripping coil TQ2 is connected with a negative pole KM-of a control power supply of the ring main unit; the device also comprises a main circuit breaker QF connected between the wind driven generator and the power system, and a tripping coil TQ2 drives and controls the opening operation of the main circuit breaker QF so as to disconnect the wind driven generator from the power system; it will be appreciated that the main circuit breaker QF is controlled by the trip coil TQ2 to act, i.e. when the trip coil TQ2 is in the powered state, it can control the main circuit breaker QF to open to disconnect the connection between the wind turbine and the power system. Because the tripping coil TQ2 belongs to a breaking coil integrated in the bistable circuit breaker QF, the main circuit breaker QF can be broken and maintained in a breaking state only by sending an electric pulse to the tripping coil TQ 2; the closing coils (not shown) integrated in the same bistable circuit breaker are re-closed and maintained in a closed state to restore the connection of the wind generator to the power system unless they receive a closing electric pulse. The power supply voltage detection loop comprises a relay ZJ, a coil of the relay ZJ is connected in parallel with two ends of a control power supply of the ring main unit, and a normally closed contact ZJ-1 of the relay ZJ is connected in series with a loop where the discharge loop is located.
Furthermore, the medium-voltage ring main unit power-loss tripping device further comprises a supercapacitor group on-line monitoring loop, wherein the supercapacitor group on-line monitoring loop comprises a normally-open auxiliary contact QF1 of a 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 a positive pole KM+ of a 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 a negative pole 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 auxiliary contacts of the bistable circuit breaker QF, which are controlled by the built-in coil (closing coil and opening coil) of the bistable circuit breaker. When the ring main unit is in a closing state, normally open auxiliary contacts QF1 and QF2 of the bistable circuit breaker QF can be synchronously closed; conversely, 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 synchronously disconnected, which is well known to those skilled in the art and will not be described in detail herein. The types of the components in the circuit connection relationship may be selected according to the actual use, and will not be described in detail here.
The working principle of the circuit connection relation is 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 charge the super capacitor group 1 through the current limiting resistor R quickly. The main charging mode can be completed within 2-3 seconds, then the floating charging state is automatically switched into, and the floating charging current and the leakage current of the super capacitor bank 1 have the same size; meanwhile, the relay ZJ is electrified to be attracted, 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 the switching-off state to the switching-on 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 changed from the breaking state to the closing state. At this time, the ring main unit control power supply KM is connected in parallel to the supercapacitor set 1 through the current limiting resistor R and the online monitoring loop of the supercapacitor set, and the online monitoring loop of the supercapacitor set is formed by connecting a normally open auxiliary contact QF1 with a coil of a relay K in series.
Otherwise, if the ring main unit control power supply KM loses power due to faults, the coil of the relay ZJ loses power and resets, the corresponding normally closed contact ZJ-1 is closed again, a discharging loop of a discharging outlet Vout+ of the supercapacitor group 1 is connected, the discharging loop supplies power to the tripping coil TQ2, so that the tripping coil TQ2 is electrified to start the main circuit breaker QF to break, the connection between the wind driven generator and the power system is cut off, and the safety of the power system and the wind driven generator is ensured.
Regarding the working principle of the online 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 smaller and insufficient to drive the coil of the relay K, so that the normally open contact K-1 of the relay K is disconnected, the power supply loop of the indicating element is cut off, and the indicating element stops working; on the contrary, if the quality of the supercapacitor group 1 is seriously reduced, the leakage current generated after the supercapacitor group 1 is fully charged is larger, and the coil of the relay K can be driven to be attracted, so that the normally open contact K-1 of the relay K is closed, and the power supply loop of the indicating element is connected, so that the indicating element sends a prompt signal, thereby reminding a user that the service life of the supercapacitor group 1 is about to be exhausted, and the supercapacitor group needs to be replaced, and is more humanized.
Example two
As shown in fig. 2 and 3, on the basis of the first embodiment, the online monitoring circuit of the supercapacitor group is further connected with a current monitoring module 2, and the current monitoring module 2 is preferably a digital ammeter; 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, PLC, CPU, MCU, ARM, and the like. The control module 3 is connected to a display module 4, which 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; the maximum leakage current value Imax corresponds to a leakage current value generated 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 supercapacitor group, 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 the current change rate lambda of the online monitoring loop of the supercapacitor group according to the change amount and time interval of the current value stored in the buffer, then calculates the current difference delta I between the maximum leakage current value Imax and the current value stored in the buffer last time, finally calculates the residual use duration T of the supercapacitor group 1 according to the current difference delta I and the current change rate lambda, and the control module 3 sends the calculated residual use duration T to the display module 4 for display. The user can know the remaining service life of the supercapacitor pack 1 according to the value of the remaining service time period T shown in the display module 4, so as to prepare 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 an audible alarm circuit. When the control module 3 monitors that the current value stored in the buffer memory is greater than or equal to the maximum leakage current value Imax, the control module 3 controls the warning module 5 to warn, namely, reminds the user that the service life of the supercapacitor bank 1 reaches the upper limit in a mode of sending out warning sound, and the supercapacitor bank needs to be replaced in time.
Example III
Based on the second embodiment, the method for calculating the current change rate λ includes: the current value measured recently in the buffer memory is differenced with the current value measured last time through 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 by the formula lambda=Δi/Δt;
the current difference delta I is calculated by the following steps: the maximum leakage current value Imax is differed from the current value measured recently in the buffer memory through the control module 3, and a current difference value delta I is calculated;
the calculation method of the residual use duration T of the supercapacitor group 1 comprises the following steps: the value of the remaining use period T of the supercapacitors 1 is calculated by the formula t=Δi/λ.
Claims (5)
1. The utility model provides a middling pressure looped netowrk cabinet loses electric trip gear which characterized in that: comprising
The super capacitor group (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 pole KM-of a ring main unit control power supply;
the charging loop comprises a resistor R, one end of the resistor R is connected with a positive pole KM+ of a ring main unit control power supply, and the other end of the resistor R is connected with 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 with a discharging outlet Vout+ of the supercapacitor group (1), the other end of the normally open auxiliary contact QF2 is connected with one end of the tripping coil TQ2, and the other end of the tripping coil TQ2 is connected with a negative pole KM-of a control power supply of the ring main unit; the device also comprises a main circuit breaker QF connected between the wind driven generator and the power system, and a tripping coil TQ2 drives and controls the opening operation of the main circuit breaker QF so as to disconnect the wind driven generator from the power system;
the power supply voltage detection loop comprises a relay ZJ, wherein a coil of the relay ZJ is connected in parallel with two ends of a control power supply of the ring main unit, and a normally closed contact ZJ-1 of the relay ZJ is connected in series with a loop where the discharge loop is located;
the on-line monitoring circuit of the super capacitor bank comprises a normally open auxiliary contact QF1 of a 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 a positive pole KM+ of a 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 a negative pole KM-of the ring main unit control power supply;
the super capacitor bank on-line monitoring loop is also connected with a current monitoring module (2), the current monitoring module (2) is connected with a control module (3), and the control module (3) is connected with a display module (4).
2. The medium voltage ring main unit power loss trip unit according to claim 1, wherein: the indicator element is an indicator lamp HD.
3. The medium voltage ring main unit power loss trip unit according to claim 1, wherein: the control module (3) comprises a buffer and is preset with a maximum leakage current value Imax; the current monitoring module (2) is used for detecting the current value of the online monitoring loop of the supercapacitor group, 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 the current change rate lambda of the online monitoring loop of the supercapacitor group according to the change amount and time interval of the current value stored in the buffer, then calculates the current difference delta I between the maximum leakage current value Imax and the current value stored in the buffer last time, finally calculates the residual use time length T of the supercapacitor group (1) according to the current difference delta I and the current change rate lambda, and the control module (3) sends the calculated residual use time length T to the display module (4) for display.
4. A medium voltage ring main unit power loss trip unit according to claim 3, wherein:
the method for calculating the current change rate lambda comprises the following steps: the current value measured recently in the buffer memory is differed from the current value measured last time through 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 by the formula lambda=Δi/Δt;
the current difference delta I is calculated by the following steps: the maximum leakage current value Imax is differed from the current value measured recently in the buffer memory through the control module (3), and a current difference delta I is calculated;
the method for calculating the residual use duration T of the supercapacitor group (1) comprises the following steps: the value of the remaining in-use length T of the supercapacitors (1) is calculated by the formula t=Δi/λ.
5. A medium voltage ring main unit power loss trip unit according to claim 3, wherein: the control module (3) is also connected with a warning module (5), and when the control module (3) monitors that the current value stored in the buffer is greater than or equal to the maximum leakage current value Imax, the control module (3) controls the warning module (5) to give an alarm.
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| US6359763B1 (en) * | 1998-10-16 | 2002-03-19 | Alstom Uk Limited | Monitoring apparatus for electrical circuits |
| KR101059771B1 (en) * | 2011-01-10 | 2011-08-26 | 주식회사 원방하이테크 | Apparatus for monitoring operating characteristics of circuit breaker having a study function |
| CN105914868A (en) * | 2016-05-18 | 2016-08-31 | 西安科技大学 | Supercapacitor energy storage uninterruptible power supply based on current transformer, and power supply method thereof |
| CN207184025U (en) * | 2017-06-15 | 2018-04-03 | 国网山西省电力公司电力科学研究院 | Breaker emergency trip control circuit after dc source all disappears |
| CN210468779U (en) * | 2019-07-31 | 2020-05-05 | 宁波天安（集团）股份有限公司 | Power-off tripping device of medium-voltage ring main unit |
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| CN110504657A (en) | 2019-11-26 |
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