CN111585255A - Trip monitoring loop - Google Patents
Trip monitoring loop Download PDFInfo
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- CN111585255A CN111585255A CN202010348729.3A CN202010348729A CN111585255A CN 111585255 A CN111585255 A CN 111585255A CN 202010348729 A CN202010348729 A CN 202010348729A CN 111585255 A CN111585255 A CN 111585255A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
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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
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Keying Circuit Devices (AREA)
Abstract
The embodiment of the invention discloses a trip monitoring circuit, which comprises: the circuit breaker comprises a first normally open auxiliary contact, a trip coil, a normally open contact of a trip self-holding relay, a coil of the trip self-holding relay, an on-position monitoring relay, a local interval protection trip contact, a pressing plate and a trip circuit monitoring relay; the first end of the interval protection tripping contact is electrically connected with the positive end of a first power supply, the second end of the interval protection tripping contact is electrically connected with the first end of a pressing plate, and the second end of the pressing plate is electrically connected with the second end of a tripping self-holding relay coil; the coil of the trip circuit monitoring relay is connected in parallel with the interval protection trip contact, and the normally closed contact of the trip circuit monitoring relay is connected in series in the alarm branch. The technical scheme provided by the embodiment of the invention can monitor the whole process of the tripping circuit, particularly the connection condition of the pressure plate at the tripping outlet, and is favorable for improving the reliability of the safe operation of a power grid.
Description
Technical Field
The embodiment of the invention relates to the technical field of relay protection, in particular to a trip monitoring loop.
Background
In the relay protection of the power system, a tripping loop is an important secondary loop, and a tripping command of a protection device is transmitted to a tripping coil through the tripping loop to realize the opening of a breaker, so that the fault of a power grid can be isolated in time, and the safe operation of the power grid can be ensured.
In the prior art, a monitoring loop is generally used to monitor the operation process of the trip loop to determine whether the trip loop is broken. However, the monitoring loop in the prior art has a dead zone, cannot play a role of monitoring in the whole process, and has great potential safety hazard.
Disclosure of Invention
The embodiment of the invention provides a trip monitoring loop, which can monitor the whole trip process in the normal operation process of power equipment, and particularly can monitor the operation state of a trip outlet pressing plate.
The embodiment of the invention provides a trip monitoring circuit, which comprises: the circuit breaker comprises a first normally open auxiliary contact, a trip coil, a normally open contact of a trip self-holding relay, a coil of the trip self-holding relay, an on-position monitoring relay, a local interval protection trip contact, a pressing plate and a trip circuit monitoring relay;
after the tripping latching relay normally-open contact, the tripping latching relay coil, the first normally-open auxiliary contact of the circuit breaker and the tripping coil are sequentially and electrically connected, one end of the tripping latching relay is electrically connected with the positive end of a first power supply, and the other end of the tripping latching relay is electrically connected with the negative end of the first power supply;
the first end of the coil of the on-position monitoring relay is electrically connected with the positive end of the first power supply, and the second end of the coil of the on-position monitoring relay is electrically connected with the first end of the coil of the tripping self-holding relay;
the first end of the interval protection tripping contact is electrically connected with the positive end of the first power supply, the second end of the interval protection tripping contact is electrically connected with the first end of the pressing plate, and the second end of the pressing plate is electrically connected with the second end of the tripping self-holding relay coil;
and a coil of the tripping circuit monitoring relay is connected with the interval protection tripping contact in parallel, and a normally closed contact of the tripping circuit monitoring relay is connected in series in the alarm branch.
Optionally, a first end of the coil of the trip circuit monitoring relay is electrically connected to a first end of the local interval protection trip contact, and a second end of the coil of the trip circuit monitoring relay is electrically connected to a second end of the local interval protection trip contact.
Optionally, a first end of the coil of the trip circuit monitoring relay is electrically connected to the positive first power supply terminal, and a second end of the coil of the trip circuit monitoring relay is electrically connected to the first end of the pressure plate.
Optionally, the alarm branch further comprises a second normally open auxiliary contact of the circuit breaker;
the first end of the normally closed contact of the tripping circuit monitoring relay is electrically connected with the positive end of a second power supply, the second end of the normally closed contact of the tripping circuit monitoring relay is electrically connected with the normally open auxiliary contact of the breaker, and the negative end of the second power supply is grounded.
Optionally, the alarm branch comprises a time-delay closed normally closed contact of a trip circuit monitoring relay and a second normally open auxiliary contact of the circuit breaker, and the normally closed contact of the trip circuit monitoring relay is replaced by the time-delay closed normally closed contact of the trip circuit monitoring relay;
and the time delay closing normally closed contact of the tripping circuit monitoring relay is connected with the second normally open auxiliary contact of the circuit breaker in series.
Optionally, the alarm branch further comprises a normally open contact of a jump position monitoring relay;
and the normally closed contact of the tripping circuit monitoring relay is connected with the normally open contact of the tripping position monitoring relay in series.
Optionally, the alarm branch further comprises a normally closed contact of the on-position monitoring relay;
the normally closed contact of the tripping circuit monitoring relay is connected with the normally closed contact of the on-position monitoring relay in series.
Optionally, the coil of the on-position monitoring relay is replaced by the coil of the trip-circuit monitoring relay, the coil of the on-position monitoring relay is connected with the interval protection trip contact in parallel, and the normally-closed contact of the trip-circuit monitoring relay is replaced by the normally-closed contact of the on-position monitoring relay.
The alarm branch circuit also comprises a second normally-open auxiliary contact of the circuit breaker;
and a normally closed contact of the on-position monitoring relay is connected with a second normally open auxiliary contact of the circuit breaker in series.
Optionally, a first end of the coil of the on-position monitoring relay is electrically connected to the positive end of the first power supply, a second end of the coil of the on-position monitoring relay is electrically connected to the second end of the inter-space protection tripping contact, or a first end of the coil of the on-position monitoring relay is electrically connected to the positive end of the first power supply, and a second end of the coil of the on-position monitoring relay is electrically connected to the first end of the pressing plate.
According to the trip monitoring circuit provided by the embodiment of the invention, the trip circuit monitoring relays are connected in parallel at the two ends of the interval protection trip contact, when the circuit breaker is in a closed position, as long as any point from the positive end of the first power supply to the first end of the interval protection trip contact and from the second end of the interval protection trip contact to the negative end of the first power supply is disconnected, the trip circuit monitoring relays cannot be electrified and excited to reset, so that the normally closed contact of the trip circuit monitoring relay is closed, and an alarm signal of the disconnection of the trip circuit is sent. Compared with the prior art, the technical scheme provided by the embodiment of the invention can monitor the whole process of the tripping circuit during the normal operation of the power equipment, particularly can monitor the connection condition of the pressure plate at the tripping outlet, and is favorable for improving the reliability of the safe operation of a power grid.
Drawings
Fig. 1 is a schematic electrical connection diagram of a prior art trip monitoring circuit;
FIG. 2 is a schematic diagram of electrical connections of another prior art trip and close monitoring circuit;
fig. 3 is an electrical connection diagram of a trip monitoring circuit according to an embodiment of the present invention;
fig. 4 is an electrical connection diagram of a trip monitoring circuit according to a second embodiment of the present invention;
fig. 5 is an electrical connection diagram of a trip monitoring circuit according to a third embodiment of the present invention;
fig. 6 is an electrical connection diagram of a trip monitoring circuit according to a fourth embodiment of the present invention;
fig. 7 is an electrical connection diagram of a trip monitoring circuit according to a fifth embodiment of the present invention;
fig. 8 is an electrical connection diagram of a trip monitoring circuit according to a sixth embodiment of the present invention;
fig. 9 is an electrical connection diagram of a trip monitoring circuit according to a seventh embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic electrical connection diagram of a trip monitoring circuit of the prior art, and fig. 2 is a schematic electrical connection diagram of another trip monitoring circuit of the prior art. Referring to fig. 1 and 2, when the circuit breaker is in the closed state, the circuit breaker first normally open auxiliary contact BG1 is closed. When any trip contact in the trip loop is closed, the trip self-holding relay TBJ is started, the normally open contact TBJ1 of the trip self-holding relay is closed and then is connected with the positive end 101 of the first power supply, the positive voltage is taken to realize self-holding, and the trip coil TQ completes the trip action. When the tripping operation is completed, the first normally-open auxiliary contact BG1 of the circuit breaker is changed from the closed state to the open state, the coil HWJ of the on-position monitoring relay is de-energized, and the normally-closed contact HWJ1 of the on-position monitoring relay is closed. The alarm branch circuit in the prior art alarms by connecting a normally closed contact HWJ1 of a closing monitoring relay and a normally closed contact TWJ1 of a jump relay in series, wherein a coil TWJ of the jump relay is used for monitoring whether a closing loop is broken. When the tripping circuit and the closing circuit are not disconnected, the breaker is closed, the first normally-open auxiliary contact BG1 of the breaker is closed, the tripping circuit is conducted, the coil HWJ of the closed monitoring relay is electrified, the closed monitoring relay is excited, and the normally-closed contact HWJ1 of the closed monitoring relay is disconnected. Meanwhile, a normally closed auxiliary contact BG2 of the circuit breaker in the closing circuit is disconnected, a coil of the jump position monitoring relay loses power, the jump position monitoring relay returns, and a normally closed contact TWJ1 of the jump position monitoring relay is closed. When the circuit breaker is in the open position, the first normally open auxiliary contact BG1 of the circuit breaker is opened, the coil HWJ of the on-position monitoring relay loses power, the on-position monitoring relay returns, the normally closed contact HWJ1 of the on-position monitoring relay is closed, the normally closed auxiliary contact BG2 of the circuit breaker in the closing loop is closed at the same time, the coil of the jump position monitoring relay TWJ is electrified, the jump position monitoring relay TWJ is excited, and the normally closed contact TWJ1 of the jump position monitoring relay is opened. That is, if the tripping and closing circuit is not disconnected (i.e. the contact 103 is connected to the first power negative terminal 102), no matter the circuit breaker is in the on position or in the off position, only one of the on position monitoring relay and the off position monitoring relay is in the excitation state, and the corresponding normally closed contact is also in the off state, so that the alarm circuit does not send out an alarm signal.
However, when the positive terminal 101 of the first power supply is disconnected from the contact 103, the on-position monitoring relay in the trip circuit does not react, and the disconnection of the circuit cannot be effectively monitored. In particular, the connection condition of the pressure plate LP of the trip outlet cannot be monitored. The clamp plate LP throws back the connection piece through clamp bolt, realizes the break-make of artificial switching tripping circuit, if at power equipment operation in-process, because the hourglass of clamp plate LP throws or the switching is not in place, perhaps the switching is in place but clamp plate LP back connecting wire corrosion, not hard up cause the clamp plate LP actually to be in the off-state, at this moment, can not monitor the state of clamp plate through prior art scheme, cause the great hidden danger of switch rejection easily. In the actual trip circuit, tens of contacts exist between the first power supply positive terminal 101 and the first power supply negative terminal 102, if any node is in poor contact, the trip circuit is broken, so that a protection command cannot be transmitted to the circuit breaker, the switch fails to operate, and the fault range is enlarged.
Example one
In view of this, the embodiments of the present invention provide a trip monitoring circuit, so as to monitor the whole trip circuit in the normal operation device of the power equipment, especially monitor the connection condition of the pressure plate at the trip outlet, which is beneficial to improving the reliability of the safe operation of the power grid. Fig. 3 is an electrical connection diagram of a trip monitoring circuit according to an embodiment of the present invention. Referring to fig. 3, a trip monitoring circuit provided by an embodiment of the present invention includes: the circuit breaker comprises a breaker first normally-open auxiliary contact BG1, a trip coil TQ, a trip self-holding relay normally-open contact TBJ1, a trip self-holding relay coil TBJ, an on-position monitoring relay HWJ, a local interval protection trip contact TJ, a pressure plate LP and a trip circuit monitoring relay TLJ;
after the tripping self-holding relay normally-open contact TBJ1, the tripping self-holding relay coil TBJ, the breaker first normally-open auxiliary contact BG1 and the tripping coil TQ are electrically connected in sequence, one end of the tripping self-holding relay is electrically connected with the first power supply positive end 101, and the other end of the tripping self-holding relay is electrically connected with the first power supply negative end 102;
a first end of the coil of the on-position monitoring relay HWJ is electrically connected to the first power supply positive terminal 101, and a second end of the coil of the on-position monitoring relay HWJ is electrically connected to a first end of the trip latching relay coil TBJ;
a first end a of the interval protection tripping contact TJ is electrically connected with a first power supply positive end 101, a second end b of the interval protection tripping contact TJ is electrically connected with a first end c of a pressing plate LP, and a second end d of the pressing plate LP is electrically connected with a second end of the tripping self-holding relay coil TBJ;
the coil of the trip circuit monitoring relay TLJ is connected in parallel with the interval protection trip contact TJ, and the normally closed contact of the trip circuit monitoring relay TLJ is connected in series in the alarm branch.
Specifically, TJR, TJQ, and TJF are three-trip relays with different functions, wherein the three-trip relay TJR does not start reclosing after acting, but does not start malfunctioning; after the three-jump relay TJQ acts, reclosing is started, and meanwhile, the starting is failed; after the three-jump relay TJF acts, reclosing is not started, and the starting failure is not started. STJ is the manual tripping of this interval breaker contact by the operator. When the circuit breaker is in a closed state, a first normally-open auxiliary contact BG1 of the circuit breaker is closed. When any trip contact in the trip loop is closed, the trip self-holding relay TBJ is started, the normally open contact TBJ1 of the trip self-holding relay is closed and then is connected with the positive end 101 of the first power supply, the positive voltage is taken to realize self-holding, and the trip coil TQ completes the trip action. After tripping is completed, the first normally-open auxiliary contact BG1 of the circuit breaker is changed from a closed state to an open state, a coil HWJ of the on-position monitoring relay is de-energized, and a normally-closed contact of the on-position monitoring relay is closed. When the line between the contact 103 in the trip circuit and the first power negative terminal 102 is broken, the on-position monitoring relay HWJ returns, the normally open contact of the on-position monitoring relay HWJ is opened, and the normally closed contact is closed. Meanwhile, the trip circuit monitoring relay TLJ cannot be electrically excited, so that the normally closed contact of the trip circuit monitoring relay TLJ connected in series in the alarm branch (not shown in fig. 3) is closed, and an alarm signal of "trip circuit broken" is reported. The trip circuit monitoring relay TLJ can monitor not only the disconnection of the line from the contact 103 to the negative first power supply terminal 102 but also the disconnection of the line between the positive first power supply terminal 101 and the first end a of the present interval protection trip contact TJ and the line between the second end b of the present interval protection trip contact TJ and the contact 103. That is, when the circuit breaker is in the closed position, as long as any point between the first power supply positive terminal 101 to the first end a of the interval protection tripping contact TJ and the second end b of the interval protection tripping contact TJ and the first power supply negative terminal 102 is disconnected, the tripping circuit monitoring relay TLJ cannot be electrified and excited, so that the tripping circuit monitoring relay TLJ returns, the normally closed contact of the tripping circuit monitoring relay TLJ is closed, and the alarm branch sends an alarm signal of 'tripping circuit disconnection', so that the whole tripping process can be effectively monitored, and particularly, the condition that whether the pressing plate LP at the tripping outlet is put in place or the wiring is good can be monitored.
According to the trip monitoring circuit provided by the embodiment of the invention, the trip circuit monitoring relays are connected in parallel at the two ends of the interval protection trip contact, when the circuit breaker is in a closed position, as long as any point from the positive end of the first power supply to the first end of the interval protection trip contact and from the second end of the interval protection trip contact to the negative end of the first power supply is disconnected, the trip circuit monitoring relays are all powered off, so that the normally closed contact of the trip circuit monitoring relay is closed, and an alarm signal of the disconnection of the trip circuit is sent. Compared with the prior art, the technical scheme provided by the embodiment of the invention can monitor the whole process of the tripping circuit during the normal operation of the power equipment, particularly can monitor the connection condition of the pressure plate at the tripping outlet, and is favorable for improving the reliability of the safe operation of a power grid.
Example two
On the basis of the above embodiment, with continued reference to fig. 3, the first end of the coil of the trip circuit supervision relay TLJ provided in the embodiment of the present invention is electrically connected to the first end a of the present interval protection trip contact TJ, and the second end of the coil of the trip circuit supervision relay TLJ is electrically connected to the second end b of the present interval protection trip contact TJ.
Specifically, the advantage of such an arrangement is that the area where both ends of the coil of the trip circuit monitor relay TLJ are inserted between the trip circuits belongs to the monitoring blind area, and by electrically connecting the first end of the coil of the trip circuit monitor relay TLJ with the first end a of the present interval protection trip contact TJ and the second end of the coil of the trip circuit monitor relay TLJ with the second end b of the present interval protection trip contact TJ, both ends of the coil of the trip circuit monitor relay TLJ can be made to approach the present interval protection trip contact TJ infinitely, so that there is and only one break point in the trip circuit, i.e., the present interval protection trip contact TJ, and the whole course of the trip circuit can be monitored in the case of no protection action or manual trip of the relay device.
Optionally, fig. 4 is an electrical connection schematic diagram of a trip monitoring circuit according to a second embodiment of the present invention. Referring to fig. 4, on the basis of the above embodiment, a first end of the coil of the trip circuit supervision relay TLJ provided by the embodiment of the present invention is electrically connected to the first power supply positive terminal 101, and a second end of the coil of the trip circuit supervision relay TLJ is electrically connected to the first end c of the pressure plate LP.
Specifically, in a normal case, the interval protection trip contact TJ is located in an internal plug-in of the protection device, which does not facilitate connection of the coil of the trip circuit supervision relay TLJ, and therefore, a first end of the coil of the trip circuit supervision relay TLJ may be electrically connected to the first power source positive terminal 101, and a second end of the coil of the trip circuit supervision relay TLJ may be electrically connected to the first end c of the pressing plate LP, but the connection position of the second end of the coil of the trip circuit supervision relay TLJ must be close to the side of the first end c of the pressing plate LP to effectively supervise the connection condition of the pressing plate LP. The more infinitely the two ends of the coil of the trip circuit supervision relay TLJ approach the present interval protection trip contact TJ, the more the whole course of the trip circuit can be supervised.
EXAMPLE III
Fig. 5 is an electrical connection diagram of a trip monitoring circuit according to a third embodiment of the present invention. Referring to fig. 5, on the basis of the above embodiment, the alarm branch 100 further includes a breaker second normally open auxiliary contact BG 3;
a first end of the normally closed contact TLJ1 of the trip circuit supervision relay TLJ is electrically connected to the positive second power supply terminal 201, a second end of the normally closed contact TLJ1 of the trip circuit supervision relay TLJ is electrically connected to the second normally open auxiliary contact BG3, and the negative second power supply terminal is grounded (not shown).
Specifically, when the three-trip relay TJR, TJQ, and TJF and the worker manually trip the inter-block circuit breaker contact STJ, the coil of the trip circuit monitoring relay TLJ is short-circuited, so that the trip circuit monitoring relay TLJ cannot be excited and reset, and thus the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is closed, thereby misrepresenting an alarm signal of "trip circuit open". In addition, when the trip latching relay TBJ is activated after any of the above protection actions, the coil of the trip circuit supervision relay TLJ is shorted, so that the trip circuit supervision relay TLJ is de-energized, and the normally closed contact TLJ1 of the trip circuit supervision relay TLJ is closed, thereby also falsely reporting an alarm signal of "trip circuit open".
In order to avoid the phenomenon of false alarm signals, a breaker second normally open auxiliary contact BG3 is introduced into the alarm branch 100, and the breaker second normally open auxiliary contact BG3 is connected in series with a normally closed contact TLJ1 of the trip circuit monitoring relay TLJ. Only under the condition that the circuit breaker is closed, namely the second normally-open auxiliary contact BG3 of the circuit breaker is closed, when any point of a first power supply positive terminal 101 to a first end a of the interval protection tripping contact TJ and a second end b of the interval protection tripping contact TJ to a first power supply negative terminal 102 in the tripping circuit is disconnected, the tripping circuit monitoring relay TLJ can reset, a normally-closed contact TLJ1 of the tripping circuit monitoring relay TLJ is closed, so that the alarm branch circuit 100 is switched on, and an alarm signal of 'tripping circuit disconnection' is reported. The second power supply may be a signal power supply for providing a voltage signal to the alarm branch 100. When any one of the protection actions or the manual opening moment, the second normally-open auxiliary contact BG3 of the circuit breaker is changed from closed to open, the alarm branch 100 cannot be conducted, and further the situation of misinformation cannot occur.
Example four
Fig. 6 is an electrical connection diagram of a trip monitoring circuit according to a fourth embodiment of the present invention. Referring to fig. 6, on the basis of the above embodiment, the alarm branch 100 includes the time-delay closing normally closed contact TLJ2 of the trip circuit monitoring relay TLJ and the breaker second normally open auxiliary contact BG3, and the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is replaced with the time-delay closing normally closed contact TLJ2 of the trip circuit monitoring relay TLJ;
the time-delay closing normally closed contact TLJ2 of the trip circuit supervision relay TLJ is connected in series with the breaker second normally open auxiliary contact BG 3.
Specifically, in the actual relay protection system, a short time difference exists in the process that the relay protection device receives a trip command and protects the breaker from being in an on-position and changing into an off-position, generally tens of milliseconds, and when the breaker receives the trip command, part of relay protection devices may return after an instant false alarm, so that the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is replaced by the time-delay closed normally closed contact TLJ2 of the trip circuit monitoring relay TLJ in the alarm branch circuit 100, so that the time difference is utilized to avoid the false alarm phenomenon by utilizing the time-delay closing characteristic of the time-delay closed normally closed contact TLJ 2. For example, during normal operation of the power equipment, the circuit breaker is in an on state, and when the circuit breaker is tripped, part of the quick-break relay may be reset before the trip coil TQ has not received a trip command, so that the alarm branch 100 may falsely report the disconnection alarm signal. However, the normally closed contact TLJ2 is closed in a delayed manner by adopting the delayed closing of the trip circuit monitoring relay TLJ, and the normally closed contact TLJ2 is closed in a delayed manner after the trip circuit monitoring relay TLJ is reset, so that the time difference from the action of the trip circuit monitoring relay TLJ to the tripping process of the circuit breaker is avoided, and the alarm branch circuit 100 cannot be in a false alarm condition.
EXAMPLE five
Fig. 7 is an electrical connection diagram of a trip monitoring circuit according to a fifth embodiment of the present invention. Referring to fig. 2 and 7, in the above embodiment, the alarm branch 100 further includes a normally open contact TWJ2 of the jump monitor relay TWJ;
the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ and the normally open contact TWJ2 of the trip monitoring relay TWJ are connected in series.
Specifically, when the circuit breaker is in the off position, the first normally open auxiliary contact BG1 of the circuit breaker is opened, the coil HWJ of the on monitoring relay is disconnected due to power loss, the on monitoring relay is reset, the normally closed contact HWJ1 of the on monitoring relay is closed, meanwhile, the normally closed auxiliary contact BG2 of the circuit breaker in the closing loop is closed, the coil of the jump monitoring relay TWJ is conducted, the jump monitoring relay TWJ is excited, the normally closed contact TWJ1 of the jump monitoring relay is opened, and the normally open contact TWJ2 of the jump monitoring relay is closed. When any point of the positive end 101 of the first power supply in the trip circuit to the first end a of the interval protection trip contact TJ and the second end b of the interval protection trip contact TJ to the negative end 102 of the first power supply is disconnected, the trip circuit monitoring relay TLJ returns, the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is closed, so that the alarm branch 100 is turned on, and an alarm signal of 'trip circuit disconnection' is reported.
EXAMPLE six
Fig. 8 is an electrical connection diagram of a trip monitoring circuit according to a sixth embodiment of the present invention. Referring to fig. 8, in addition to the above embodiment, the alarm branch 100 further includes a normally closed contact HWJ1 of the on-position monitoring relay HWJ;
the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is connected in series with the normally closed contact HWJ1 of the on monitoring relay HWJ.
Specifically, when the circuit breaker is in the off position, the first normally-open auxiliary contact BG1 of the circuit breaker is opened, the coil HWJ of the on-position monitoring relay is disconnected due to power loss, the on-position monitoring relay is reset, and the normally-closed contact HWJ1 of the on-position monitoring relay is closed. When any point of the positive end 101 of the first power supply in the trip circuit to the first end a of the interval protection trip contact TJ and the second end b of the interval protection trip contact TJ to the negative end 102 of the first power supply is disconnected, the trip circuit monitoring relay TLJ loses power, the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is closed, and thus the alarm branch 100 is turned on to report an alarm signal of 'trip circuit disconnection'.
EXAMPLE seven
Fig. 9 is an electrical connection diagram of a trip monitoring circuit according to a seventh embodiment of the present invention. Referring to fig. 9, on the basis of the above embodiment, the coil of the on-position monitor relay HWJ is replaced with the coil of the trip circuit monitor relay TLJ, the coil of the on-position monitor relay HWJ is connected in parallel with the local interval protection trip contact TJ, and the normally closed contact TLJ1 of the trip circuit monitor relay TLJ is replaced with the normally closed contact HWJ1 of the on-position monitor relay HWJ.
Specifically, in the embodiment of the present invention, the original on-position monitoring relay HWJ may be used to replace the trip circuit monitoring relay TLJ, and it is also possible to monitor that any point in the trip circuit from the positive first power supply terminal 101 to the first end a of the interval protection trip contact TJ and from the second end b of the interval protection trip contact TJ to the negative first power supply terminal 102 is disconnected. When the circuit breaker is in a closed state, a first normally-open auxiliary contact BG1 of the circuit breaker is closed. When any trip contact in the trip loop is closed, the trip self-holding relay TBJ is started, the normally open contact TBJ1 of the trip self-holding relay is closed and then is connected with the positive end 101 of the first power supply, the positive voltage is taken to realize self-holding, and the trip coil TQ completes the trip action. When the tripping operation is completed, the first normally open auxiliary contact BG1 of the circuit breaker is changed from the closed state to the open state, and the power circuit of the coil HWJ of the on-position monitoring relay is broken, so that the coil HWJ of the on-position monitoring relay loses power, and the normally closed contact HWJ1 of the on-position monitoring relay is closed. That is, when any point of the first power supply positive terminal 101 to the first end a of the interval protection trip contact TJ and the second end b of the interval protection trip contact TJ to the first power supply negative terminal 102 in the trip circuit is disconnected, the on-position monitoring relay HWJ is reset, the normally closed contact HWJ1 of the on-position monitoring relay HWJ connected to the alarm branch circuit 100 is closed, the alarm branch circuit 100 is turned on, and thus the alarm signal of "trip circuit disconnection" is reported.
Optionally, with continued reference to fig. 9, the alarm branch 100 further includes a breaker second normally open auxiliary contact BG 3; the normally closed contact HWJ1 of the closing position monitoring relay HWJ is connected in series with the second normally open auxiliary contact BG3 of the circuit breaker.
Specifically, when the circuit breaker is closed, that is, the second normally open auxiliary contact BG3 of the circuit breaker is closed, when any point of the first power supply positive terminal 101 to the first end a of the interval protection trip contact TJ and the second end b of the interval protection trip contact TJ to the first power supply negative terminal 102 in the trip circuit is disconnected, the trip circuit monitoring relay TLJ will reset, and the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is closed, so that the alarm branch circuit 100 is turned on, and an alarm signal of "trip circuit disconnection" is reported. When any one of the protection actions or the manual opening moment, the second normally-open auxiliary contact BG3 of the circuit breaker is changed from closed to open, the alarm branch 100 cannot be conducted, and further the situation of misinformation cannot occur.
Alternatively, a first end of the coil of the on monitor relay HWJ is electrically connected to the first end a of the inter-space protection trip contact TJ, a second end of the coil of the on monitor relay HWJ is electrically connected to the second end b of the inter-space protection trip contact TJ, or a first end of the coil of the on monitor relay HWJ is electrically connected to the positive first power supply terminal 101, and a second end of the coil of the on monitor relay HWJ is electrically connected to the first end c of the pressing plate LP.
Specifically, a first end of the coil of the on-position monitoring relay HWJ may be electrically connected to the positive first power supply terminal 101, and a second end of the coil of the on-position monitoring relay HWJ may be electrically connected to the first end c of the pressure plate LP, but the connection position of the second end of the coil of the on-position monitoring relay HWJ must be close to the side of the first end c of the pressure plate LP to effectively monitor the connection condition of the pressure plate LP. The closer the two ends of the coil of the on-position monitoring relay HWJ approach the interval protection trip contact TJ, the more the whole range of the trip circuit can be monitored.
Of course, the first end of the coil of the on-position monitoring relay HWJ may be electrically connected to the first end a of the local interval protection trip contact TJ, and the second end of the coil of the on-position monitoring relay HWJ may be electrically connected to the second end b of the local interval protection trip contact TJ, so that the two ends of the coil of the on-position monitoring relay HWJ may approach the local interval protection trip contact TJ infinitely, and thus there is only one open point in the trip circuit, i.e., the local interval protection trip contact TJ, and the whole course of the trip circuit may be monitored in the case that the relay device does not perform a protection operation or manually trips.
According to the trip monitoring circuit provided by the embodiment of the invention, the trip circuit monitoring relays are connected in parallel at the two ends of the interval protection trip contact, when the circuit breaker is in a closed position, as long as any point from the positive end of the first power supply to the first end of the interval protection trip contact and from the second end of the interval protection trip contact to the negative end of the first power supply is disconnected, the trip circuit monitoring relays are all powered off, so that the normally closed contact of the trip circuit monitoring relay is closed, and an alarm signal of the disconnection of the trip circuit is sent. And the phenomenon of misinformation can be avoided when the relay protection device acts or is manually tripped by introducing a second normally open auxiliary contact of the breaker into the alarm branch circuit. Compared with the prior art, the technical scheme provided by the embodiment of the invention can monitor the whole process of the tripping circuit in the normal operation device of the power equipment, particularly can monitor the connection condition of the pressure plate at the tripping outlet, and is favorable for improving the reliability of the safe operation of a power grid.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A trip monitoring circuit, comprising: the circuit breaker comprises a first normally open auxiliary contact, a trip coil, a normally open contact of a trip self-holding relay, a coil of the trip self-holding relay, an on-position monitoring relay, a local interval protection trip contact, a pressing plate and a trip circuit monitoring relay;
after the tripping latching relay normally-open contact, the tripping latching relay coil, the first normally-open auxiliary contact of the circuit breaker and the tripping coil are sequentially and electrically connected, one end of the tripping latching relay is electrically connected with the positive end of a first power supply, and the other end of the tripping latching relay is electrically connected with the negative end of the first power supply;
the first end of the coil of the on-position monitoring relay is electrically connected with the positive end of the first power supply, and the second end of the coil of the on-position monitoring relay is electrically connected with the first end of the coil of the tripping self-holding relay;
the first end of the interval protection tripping contact is electrically connected with the positive end of the first power supply, the second end of the interval protection tripping contact is electrically connected with the first end of the pressing plate, and the second end of the pressing plate is electrically connected with the second end of the tripping self-holding relay coil;
and a coil of the tripping circuit monitoring relay is connected with the interval protection tripping contact in parallel, and a normally closed contact of the tripping circuit monitoring relay is connected in series in the alarm branch.
2. The trip monitoring circuit of claim 1, wherein a first end of the coil of the trip circuit monitoring relay is electrically connected to a first end of the local spaced apart protection trip contact and a second end of the coil of the trip circuit monitoring relay is electrically connected to a second end of the local spaced apart protection trip contact.
3. The trip monitoring circuit of claim 1, wherein a first end of the coil of the trip circuit monitoring relay is electrically connected to the positive first power supply terminal and a second end of the coil of the trip circuit monitoring relay is electrically connected to the first end of the pressure plate.
4. The trip monitoring circuit of claim 1, wherein the alarm branch further comprises a circuit breaker second normally open auxiliary contact;
the first end of the normally closed contact of the tripping circuit monitoring relay is electrically connected with the positive end of a second power supply, the second end of the normally closed contact of the tripping circuit monitoring relay is electrically connected with the normally open auxiliary contact of the breaker, and the negative end of the second power supply is grounded.
5. The trip monitoring circuit of claim 1, wherein the alarm branch comprises a time-delay closed normally closed contact of a trip circuit monitoring relay and a breaker second normally open auxiliary contact, the normally closed contact of the trip circuit monitoring relay being replaced with the time-delay closed normally closed contact of the trip circuit monitoring relay;
and the time delay closing normally closed contact of the tripping circuit monitoring relay is connected with the second normally open auxiliary contact of the circuit breaker in series.
6. The trip monitoring circuit of claim 1, wherein the alarm branch further comprises a normally open contact of a trip monitor relay;
and the normally closed contact of the tripping circuit monitoring relay is connected with the normally open contact of the tripping position monitoring relay in series.
7. The trip monitoring circuit of claim 1, wherein the alarm branch further comprises a normally closed contact of the on monitoring relay;
the normally closed contact of the tripping circuit monitoring relay is connected with the normally closed contact of the on-position monitoring relay in series.
8. The trip monitoring circuit of claim 1, wherein the coil of the on monitoring relay is replaced with a coil of the trip circuit monitoring relay, the coil of the on monitoring relay is connected in parallel with the local isolation protection trip contact, and the normally closed contact of the trip circuit monitoring relay is replaced with a normally closed contact of the on monitoring relay.
9. The trip monitoring circuit of claim 8, wherein the alarm branch further comprises a circuit breaker second normally open auxiliary contact;
and a normally closed contact of the on-position monitoring relay is connected with a second normally open auxiliary contact of the circuit breaker in series.
10. The trip monitoring circuit of claim 8, wherein a first end of the coil of the on monitoring relay is electrically connected to the positive first power supply terminal, a second end of the coil of the on monitoring relay is electrically connected to the second terminal of the present interval protection trip contact, or a first end of the coil of the on monitoring relay is electrically connected to the positive first power supply terminal, and a second end of the coil of the on monitoring relay is electrically connected to the first terminal of the hold down plate.
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Cited By (1)
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| CN113852041A (en) * | 2021-09-14 | 2021-12-28 | 国网天津市电力公司 | Circuit and method for monitoring reclosing loop when circuit breaker is closed |
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| CN111585255B (en) | 2022-02-01 |
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