CN111458633B - Tripping and closing monitoring circuit and fault alarming method - Google Patents
Tripping and closing monitoring circuit and fault alarming method Download PDFInfo
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- CN111458633B CN111458633B CN202010348321.6A CN202010348321A CN111458633B CN 111458633 B CN111458633 B CN 111458633B CN 202010348321 A CN202010348321 A CN 202010348321A CN 111458633 B CN111458633 B CN 111458633B
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- 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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Abstract
The embodiment of the invention discloses a tripping and closing monitoring loop and a fault alarming method, wherein a control loop comprises a tripping loop, a closing loop and an alarming loop; the tripping circuit comprises a breaker normally-open auxiliary contact tripping latching relay normally-open contact, a tripping latching relay coil, an on-position monitoring relay, the interval protection tripping contact, a pressing plate and a tripping circuit monitoring relay; the closing loop comprises a breaker normally closed auxiliary contact, a closing latching relay normally open contact, a closing latching relay coil, a closing reset contact, a tripping monitoring relay and a closing loop monitoring relay; the normally closed contact of the tripping circuit monitoring relay and the normally closed contact of the closing circuit monitoring relay are connected in series in the alarm circuit. The technical scheme provided by the embodiment of the invention can monitor the whole process of the tripping circuit and the closing 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 tripping and closing monitoring circuit and a fault alarm method.
Background
In the relay protection of the power system, a control loop of tripping and closing is an important secondary loop, and a tripping command of a protection device is transmitted to a tripping and closing coil through the control loop to realize the switching on and off 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 a tripping and closing monitoring loop to determine whether a tripping loop or a closing 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 tripping and closing monitoring circuit and a fault alarming method, which are used for monitoring the whole tripping and closing process in the normal operation process of power equipment, and particularly monitoring the operation state of a tripping outlet pressure plate.
In a first aspect, an embodiment of the present invention provides a tripping and closing monitoring circuit, including: a tripping loop, a closing loop and an alarm loop;
the tripping circuit comprises a breaker normally-open auxiliary contact, a tripping coil, a tripping self-holding relay normally-open contact, a tripping self-holding relay coil, an on-position monitoring relay, the interval protection tripping contact, a pressing plate and a tripping circuit monitoring relay;
after the tripping latching relay normally-open contact, the tripping latching relay coil, the breaker normally-open auxiliary contact 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 coil of the on-position monitoring relay is connected in parallel with two ends of a branch circuit formed by the normally open contact of the tripping self-holding relay and the coil of the tripping self-holding relay;
the branch circuit formed by the interval protection tripping contact and the pressing plate is connected in parallel at two ends of the normally open contact of the tripping self-holding relay; the coil of the tripping circuit monitoring relay is connected in parallel with two ends of the interval protection tripping contact;
the switching-on loop comprises a breaker normally-closed auxiliary contact, a switching-on coil, a switching-on latching relay normally-open contact, a switching-on latching relay coil, a switching-on reset contact, a jumping position monitoring relay and a switching-on loop monitoring relay;
after the normally open contact of the closing self-holding relay, the closing self-holding relay coil, the normally closed auxiliary contact of the circuit breaker and the closing coil are sequentially and electrically connected, one end of the closing self-holding relay is electrically connected with the positive end of the first power supply, and the other end of the closing self-holding relay coil is electrically connected with the negative end of the first power supply;
the coil of the jump position monitoring relay is connected in parallel at two ends of a branch circuit formed by the normally open contact of the closing self-holding relay and the coil of the closing self-holding relay, and the coil of the closing loop monitoring relay is connected in parallel at two ends of the closing reset contact;
and the normally closed contact of the tripping circuit monitoring relay and the normally closed contact of the closing circuit monitoring relay are connected in series in the alarm circuit.
Optionally, a first end of the coil of the closing circuit monitoring relay is electrically connected to a first end of the closing override contact, and a second end of the coil of the closing circuit monitoring relay is electrically connected to a second end of the closing override contact.
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 a coil of the trip circuit monitoring relay is electrically connected with the positive end of the first power supply, a second end of a coil of the closing circuit monitoring relay is electrically connected with a first end of the pressing plate, and a second end of the pressing plate is electrically connected with the normally open contact of the trip latching relay.
Optionally, the tripping circuit monitoring relay is replaced by the on-position monitoring relay, and the normally closed contact of the tripping circuit monitoring relay is replaced by the normally closed contact of the on-position monitoring relay;
the closing circuit monitoring relay is replaced by the jumping position monitoring relay, and the normally closed contact of the closing circuit monitoring relay is replaced by the normally closed contact of the jumping position monitoring relay.
Optionally, a first end of the coil of the on-position monitoring relay is electrically connected with a first end of the interval protection tripping contact, and a second end of the coil of the on-position monitoring relay is electrically connected with a second end of the interval protection tripping contact.
Optionally, a first end of a coil of the on-position monitoring relay is electrically connected with the positive end of the first power supply, a second end of the coil of the on-position monitoring relay is electrically connected with a first end of the pressing plate, and a second end of the pressing plate is electrically connected with the normally-open contact of the trip latching relay.
In a second aspect, an embodiment of the present invention further provides a fault alarm method for a tripping and closing monitoring circuit, where the method includes:
when the circuit breaker is in a closed state, if the tripping circuit is disconnected, the tripping circuit monitoring relay is reset, and a normally closed contact of the tripping circuit monitoring relay is closed;
and the alarm loop reports 'trip loop disconnection' alarm information.
Optionally, the fault alarm method for the tripping and closing monitoring circuit provided by the embodiment of the present invention further includes:
when the circuit breaker is in an off-position state, if the closing circuit is broken, the closing circuit monitoring relay is reset, and a normally closed contact of the closing circuit monitoring relay is closed;
and the alarm loop reports 'closing loop disconnection' alarm information.
Optionally, the fault alarm method for the tripping and closing monitoring circuit provided by the embodiment of the present invention further includes:
connecting the coil of the trip circuit monitoring relay in parallel at two ends of the interval protection trip contact;
if the pressing plate is broken or has poor contact, the tripping circuit monitoring relay is reset, and the normally closed contact of the tripping circuit monitoring relay is closed;
and the alarm loop reports 'trip loop disconnection' alarm information.
According to the tripping and closing monitoring circuit provided by the embodiment of the invention, the tripping circuit monitoring relays are connected in parallel at the two ends of the interval protection tripping contact, when the breaker is in a closed position, as long as any point from the positive end of a first power supply in the tripping circuit to the first end of the interval protection tripping contact and from the second end of the interval protection tripping contact to the negative end of the first power supply is disconnected, the tripping circuit monitoring relays cannot be electrified and reset, so that the normally closed contact of the tripping circuit monitoring relay is closed, and the alarm circuit sends an alarm signal of the disconnection of the tripping circuit. When the breaker is in an off position, as long as any point from a first power supply positive end to a first end of the closing re-acting contact and from a second end of the closing re-acting contact to a first power supply negative end in the closing loop is disconnected, the closing loop monitoring relay loses power, a normally closed contact of the closing loop monitoring relay is closed, and an alarm loop sends an alarm signal of disconnection of the closing loop. Compared with the prior art, the technical scheme provided by the embodiment of the invention can monitor the whole process of the tripping circuit and the closing circuit during the normal operation of the power equipment, 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.
Drawings
FIG. 1 is a schematic diagram of electrical connections of a trip and close monitoring circuit of the prior art;
fig. 2 is an electrical connection schematic diagram of a monitoring circuit for tripping and closing according to an embodiment of the present invention;
fig. 3 is an electrical connection schematic diagram of a tripping and closing monitoring circuit according to a third embodiment of the present invention;
fig. 4 is an electrical connection schematic diagram of a tripping and closing monitoring circuit according to a fourth embodiment of the present invention;
fig. 5 is an electrical connection schematic diagram of a tripping and closing monitoring circuit according to a fifth embodiment of the present invention;
fig. 6 is a flowchart of a fault alarm method of a tripping and closing monitoring circuit according to a sixth embodiment of the present invention;
fig. 7 is a flowchart of another fault alarm method for a tripping and closing monitoring circuit according to a sixth embodiment of the present invention;
fig. 8 is a flowchart of another fault alarm method for a tripping and closing monitoring circuit according to a sixth 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 prior art trip control loop. Referring to fig. 1, when any trip contact in the trip circuit is closed, the trip latching relay TBJ is started, the normally open contact TBJ1 of the trip latching relay is closed to connect the positive terminal 101 of the first power supply, and the positive voltage is taken to realize self-holding, the normally open auxiliary contact BG1 of the breaker is closed, and the trip coil TQ completes the trip action. When the trip 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 supply circuit of the coil HWJ of the on-position monitoring relay is broken, so that the coil HWJ of the on-position monitoring relay cannot be excited to return to the original state, and the normally closed contact HWJ1 of the on-position monitoring relay is closed. The operation principle of the jump position monitoring relay TWJ in the closing loop is the same as that of the closing position monitoring relay HWJ. . The alarm branch circuit in the prior art alarms by connecting a normally closed contact HWJ1 of an on-position monitoring relay and a normally closed contact TWJ1 of a jump-position monitoring relay in series, wherein a coil TWJ of the jump-position monitoring relay is used for monitoring whether a closing circuit 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 conducted, 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 disconnected, the coil HWJ of the on-position monitoring relay is disconnected after power failure, the on-position monitoring relay is reset, the normally closed contact HWJ1 of the on-position 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 position monitoring relay TWJ is conducted, the jump position monitoring relay TWJ is excited, and the normally closed contact TWJ1 of the jump position monitoring relay is disconnected. That is, if the tripping circuit is not broken (i.e. the contact 103 is connected to the first power negative terminal 102), no matter the circuit breaker is in the closed position or in the open position, only one of the closed position monitoring relay and the jump position monitoring relay is in the excitation state, and the corresponding normally closed contact is also in the open state, so that the alarm circuit will not send out the 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 embodiment of the present invention provides a trip and close monitoring circuit, so as to monitor the whole process of the trip circuit and the close circuit during the normal operation of the power equipment, and particularly monitor the connection condition of the pressure plate at the trip outlet. Fig. 2 is an electrical connection schematic diagram of a tripping and closing monitoring circuit according to an embodiment of the present invention. Referring to fig. 2, a tripping and closing monitoring circuit provided in an embodiment of the present invention includes: a trip circuit 100, a closing circuit 200 and an alarm circuit 300;
the tripping circuit 100 comprises a breaker normally-open auxiliary contact BG1, a tripping coil TQ, a tripping self-holding relay normally-open contact TBJ1, a tripping self-holding relay coil TBJ, an on-position monitoring relay HWJ, a local interval protection tripping contact TJ, a pressure plate LP and a tripping circuit monitoring relay TLJ;
after the tripping self-holding relay normally-open contact TBJ1, the tripping self-holding relay coil TBJ, the breaker normally-open auxiliary contact BG1 and the tripping coil TQ are sequentially and electrically connected, one end of the tripping self-holding relay is electrically connected with the positive end 101 of the first power supply, and the other end of the tripping self-holding relay is electrically connected with the negative end 102 of the first power supply; the coil of the on-position monitoring relay HWJ is connected in parallel with two ends of a branch circuit consisting of a tripping self-holding relay normally-open contact TBJ1 and a tripping self-holding relay coil TBJ;
the branch circuit formed by the interval protection tripping contact TJ and the pressing plate LP is connected in parallel at two ends of the normally open contact TBJ1 of the tripping self-holding relay; a coil TLJ of the trip circuit monitoring relay is connected in parallel at two ends of the interval protection trip contact TJ;
the closing loop 200 comprises a breaker normally closed auxiliary contact BG2, a closing coil HQ, a closing self-holding relay normally open contact HBJ1, a closing self-holding relay coil HBJ, a closing reset contact ZHJ, a jump position monitoring relay TWJ and a closing loop monitoring relay HLJ;
after the normally open contact HBJ1 of the closing self-holding relay, the coil HBJ of the closing self-holding relay, the normally closed auxiliary contact BG2 of the circuit breaker and the closing coil HQ are sequentially and electrically connected, one end of the normally closed auxiliary contact is electrically connected with the positive end 101 of the first power supply, and the other end of the normally closed auxiliary contact is electrically connected with the negative end 102 of the first power supply;
a coil TWJ of the jump position monitoring relay is connected in parallel at two ends of a branch consisting of a normally open contact HBJ1 of the closing self-holding relay and a coil HBJ of the closing self-holding relay, and a coil HLJ of the closing loop monitoring relay is connected in parallel at two ends of a closing reset contact ZHJ;
the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ and the normally closed contact HLJ1 of the closing circuit monitoring relay HLJ are connected in series in the alarm circuit 300.
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. The STJ manually jumps the contacts of the interval circuit breaker for the working personnel, and when the circuit breaker is in a closed position, the normally-open auxiliary contact BG1 of the circuit breaker is closed. When any trip contact in the trip loop 100 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 the positive terminal 101 of the first power supply is connected, the positive voltage is taken to realize self-holding, the first power supply can be a control power supply, and the trip coil TQ completes the trip action. When the tripping is completed, the 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 of the on-position monitoring relay HWJ 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. At the same time, the trip circuit supervision relay TLJ also loses power and the normally closed contact TLJ1 of the trip circuit supervision relay TLJ connected in series in the alarm circuit 300 is closed. The alarm circuit 300 is electrically connected to a second power source, the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is electrically connected to the positive second power source terminal 201 (the negative second power source terminal is grounded), and the second power source may be a signal power source for providing a signal voltage to the alarm circuit 300.
In the closing circuit 200, SHJ is a coil of a manual closing relay, ZHJ is a closing override contact, and when the circuit breaker is in an open position, the circuit breaker normally-closed auxiliary contact BG2 is closed. When any closing contact in the closing loop 200 is closed, the closing self-holding relay HBJ is started, after the normally open contact HBJ1 of the closing self-holding relay is closed, the closing self-holding relay HBJ takes positive voltage to realize the excitation of the self-holding jumping position monitoring relay TWJ, meanwhile, the closing loop monitoring relay HLJ is also excited, and the normally closed contact HLJ1 of the closing loop monitoring relay HLJ is disconnected. That is, when the circuit breaker is closed, the normally open auxiliary contact BG1 of the circuit breaker is closed, the trip circuit 100 is turned on, the trip circuit monitoring relay TLJ is excited, the normally closed contact TLJ1 of the trip circuit monitoring relay in the alarm circuit 300 is opened, the normally closed auxiliary contact BG2 of the circuit breaker in the close circuit 200 is opened, the close circuit monitoring relay HLJ is reset, and the normally closed contact HLJ1 of the close circuit monitoring relay connected in series to the alarm circuit 300 is closed, when both the trip circuit 100 and the close circuit 200 are not disconnected; at this time, the alarm circuit 300 is not turned on, and the "trip circuit broken line" alarm signal is not reported. When the circuit breaker is positioned, a normally open auxiliary contact BG1 of the circuit breaker in the trip circuit 100 is disconnected, the trip circuit 100 is not conducted, a trip circuit monitoring relay TLJ is reset, and a normally closed contact TLJ1 of the trip circuit monitoring relay in the alarm circuit 300 is closed; meanwhile, a normally closed auxiliary contact BG2 of a breaker in the closing loop 200 is closed, a closing loop monitoring relay HLJ is excited, and a normally closed contact HLJ1 of the closing loop monitoring relay connected in series in the alarm loop 300 is disconnected; at this time, the alarm circuit 300 is not turned on, and the alarm signal of "close circuit open circuit" is not reported.
That is, when the tripping circuit 100 and the closing circuit 200 are not disconnected, no matter the circuit breaker is in the on-position state or the off-position state, one of the tripping circuit monitoring relay TLJ and the closing circuit monitoring relay HLJ is in the excitation state, while the other relay is in the reset state, and only one of the normally closed contact TLJ1 of the corresponding tripping circuit monitoring relay and the normally closed contact HLJ1 of the closing circuit monitoring relay is in the off state, so as to ensure that the alarm circuit 300 does not generate the false alarm condition.
When the breaker is in the closed position, the normally open auxiliary contact BG1 of the breaker is closed, the normally closed auxiliary contact BG2 of the breaker is opened, as long as any point between the trip loop 100 from the first power positive terminal 101 to the first end of the trip loop monitoring relay TLJ and the second end of the trip loop monitoring relay TLJ to the first power negative terminal 102 is disconnected, the trip loop monitoring relay TLJ cannot be electrified and excited, the normally closed contact TLJ1 of the trip loop monitoring relay TLJ is closed, because the normally open auxiliary contact BG1 of the breaker is closed at the moment, the normally closed auxiliary contact BG2 of the breaker is opened, and the normally closed contact HLJ1 of the closing loop monitoring relay is in the closed state, therefore, the alarm circuit 300 is switched on, and reports a 'trip loop disconnection' alarm signal. In addition, because the trip circuit monitoring relay TLJ is connected in parallel to the two ends of the interval protection trip contact TJ, when the pressing plate LP is disconnected or has poor contact, the trip circuit monitoring relay TLJ will also reset, the alarm circuit 300 is turned on, and a "trip circuit disconnection" alarm signal is reported, so that the monitoring of the pressing plate LP is enhanced.
When the circuit breaker is in an off position, as long as any point between the first power supply positive end 101 and the first end of the closing circuit monitoring relay HLJ in the closing circuit 200 and any point between the second end of the closing circuit monitoring relay HLJ and the first power supply negative end 102 is disconnected, the closing circuit monitoring relay HLJ cannot be electrified and excited, the normally closed contact HLJ1 of the closing circuit monitoring relay HLJ is closed, and the normally closed auxiliary contact BG2 of the circuit breaker is closed at the moment, and the normally open auxiliary contact BG1 of the circuit breaker is disconnected, so that the normally closed contact TLJ1 of the tripping circuit monitoring relay is in a closed state, and therefore, the alarm circuit 300 is switched on and reports a 'closing circuit disconnection' alarm signal.
According to the tripping and closing monitoring circuit provided by the embodiment of the invention, the tripping circuit monitoring relays are connected in parallel at the two ends of the interval protection tripping contact, when the breaker is in a closed position, as long as any point from the positive end of a first power supply in the tripping circuit to the first end of the interval protection tripping contact and from the second end of the interval protection tripping contact to the negative end of the first power supply is disconnected, the tripping circuit monitoring relays cannot be electrified and reset, so that the normally closed contact of the tripping circuit monitoring relay is closed, and the alarm circuit sends an alarm signal of the disconnection of the tripping circuit. When the breaker is in an off position, as long as any point from a first power supply positive end to a first end of the closing re-movable contact and from a second end of the closing re-movable contact to a first power supply negative end in the closing loop is disconnected, the closing loop monitoring relay cannot be electrified and reset, a normally closed contact of the closing loop monitoring relay is closed, and an alarm signal of disconnection of the closing loop is sent by an alarm loop. Compared with the prior art, the technical scheme provided by the embodiment of the invention can monitor the whole process of the tripping circuit and the closing circuit during the normal operation of the power equipment, 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.
Example two
On the basis of the above embodiment, with continued reference to fig. 1, the first end of the coil TLJ of the closing circuit monitoring relay is electrically connected to the first end e of the closing reclosing contact ZHJ, and the second end of the coil TLJ of the closing circuit monitoring relay is electrically connected to the second end f of the closing reclosing contact ZHJ.
Specifically, the advantage of such setting is that it can be ensured that when any other point in the trip circuit 200 is disconnected except the closing re-acting contact ZHJ, the closing circuit monitoring relay HLJ returns, and the alarm circuit 300 reports the "closing circuit disconnection" alarm signal. The closer the connection points at both ends of the closing circuit monitoring relay HLJ are to the connection points at both ends of the re-movable contact ZHJ, the more advantageous it is to monitor the entire process of the closing circuit 200.
Optionally, a first end of the coil TLJ of the trip circuit supervision relay is electrically connected to the first end a of the present interval protection trip contact TJ, and a second end of the coil TLJ of the trip circuit supervision relay is electrically connected to the second end b of the present interval protection trip contact TJ.
Specifically, this arrangement is advantageous in that, since both ends of the coil TLJ of the trip circuit monitoring relay are inserted into the area between the trip circuits 100, which belongs to the monitoring dead zone, by electrically connecting the first end of the coil TLJ of the trip circuit monitoring relay with the first end a of the interval protection trip contact TJ and the second end of the coil TLJ of the trip circuit monitoring relay with the second end b of the interval protection trip contact TJ, both ends of the coil of the trip circuit monitoring relay TLJ can be infinitely approached to the interval protection trip contact TJ, so that there is and only one break point in the trip circuit, i.e., the interval protection trip contact TJ, and in case that the relay device has no protection action or is manually tripped, the entire trip circuit 100 can be monitored, when any one break occurs from the first power supply positive 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 first power supply negative terminal 102 in the trip circuit 100, the alarm circuit 300 sends an alarm signal of 'trip circuit disconnection', and particularly can monitor the connection condition of the pressure plate LP at the trip outlet, which is beneficial to improving the reliability of the safe operation of the power grid.
EXAMPLE III
Fig. 3 is an electrical connection schematic diagram of a tripping and closing monitoring circuit according to a third embodiment of the present invention. Referring to fig. 3, on the basis of the above embodiment, the first end of the coil TLJ of the trip circuit monitoring relay is electrically connected to the first positive power supply terminal 101, the second end of the coil TLJ of the close circuit monitoring relay is electrically connected to the first end c of the pressure plate LP, and the second end d of the pressure plate LP is electrically connected to the normally open contact TBJ1 of the trip latching relay.
Specifically, in a normal case, the interval protection trip contact TJ is located in an internal plug-in unit of the protection device, which does not facilitate connection of the coil TLJ of the trip circuit supervision relay, and therefore, a first end of the coil TLJ of the trip circuit supervision relay may be electrically connected to the first power supply positive terminal 101, and a second end of the coil TLJ of the trip circuit supervision relay may be electrically connected to the first end c of the pressing plate LP, but a connection position of the second end of the coil TLJ of the trip circuit supervision relay must be close to a side of the first end c of the pressing plate LP to effectively supervise connection of the pressing plate LP. The more infinitely the two ends of the coil TLJ of the trip circuit supervision relay approach the present interval protection trip contact TJ, the more the full range of the trip circuit 100 can be supervised.
Example four
Fig. 4 is an electrical connection schematic diagram of a tripping and closing monitoring circuit according to a fourth embodiment of the present invention. Referring to fig. 4, on the basis of the above embodiment, the trip circuit monitoring relay TLJ is replaced with the on monitoring relay HWJ, and the normally closed contact TLJ1 of the trip circuit monitoring relay is replaced with the normally closed contact HWJ1 of the on monitoring relay;
the closing circuit monitoring relay HLJ is replaced by a jump position monitoring relay TWJ, and the normally closed contact HLJ1 of the closing circuit monitoring relay is replaced by a normally closed contact TWJ1 of the jump position monitoring relay.
Specifically, the existing on-position monitoring relay HWJ and off-position monitoring relay TWJ may be used to monitor the entire trip and close monitoring circuit without adding a new relay. When the circuit breaker is in an on state, the normally-open auxiliary contact BG1 of the circuit breaker is closed, when any trip contact in the trip loop 100 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 the positive end 101 of the first power supply is connected, positive voltage is taken to realize self-holding, and the trip coil TQ completes the trip action. When the trip is completed, the 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 monitoring relay is disconnected, so that the coil HWJ of the on monitoring relay cannot be energized and reset, and the normally closed contact HWJ1 of the on monitoring relay HWJ connected to the alarm circuit 300 is closed. When the circuit breaker is in an off-position state, the normally closed auxiliary contact BG2 of the circuit breaker is closed, when any closing contact in the closing loop 200 is closed, the closing self-holding relay HBJ is started, after the normally open contact HBJ1 of the closing self-holding relay is closed, the closing self-holding relay HBJ takes positive voltage to realize self-holding, the jump position monitoring relay TWJ is excited, and the normally closed contact TWJ1 of the jump position monitoring relay is disconnected. That is, when the circuit breaker is closed, the normally open auxiliary contact BG1 of the circuit breaker is closed, the trip circuit 100 is turned on, the closed position monitor relay HWJ is excited, the normally closed contact HWJ1 of the closed position monitor relay in the alarm circuit 300 is opened, the normally closed auxiliary contact BG2 of the circuit breaker in the closing circuit 200 is opened, the jump position monitor relay TWJ is reset, and the normally closed contact TWJ1 of the jump position monitor relay connected in series to the alarm circuit 300 is closed, in the case where neither the trip circuit 100 nor the closing circuit 200 is disconnected; at this time, the alarm circuit 300 is not turned on, and the "trip circuit broken line" alarm signal is not reported. As long as the tripping circuit 100 is disconnected from any point between the positive end of the first power supply and the first end of the on-position monitoring relay HWJ and between the second end of the on-position monitoring relay HWJ and the negative end 102 of the first power supply, the on-position monitoring relay HWJ cannot be electrified and excited, the normally closed contact HWJ1 of the on-position monitoring relay is closed, and the normally open auxiliary contact BG1 of the circuit breaker is closed at the moment, the normally closed auxiliary contact BG2 of the circuit breaker is opened, so that the normally closed contact TWJ1 of the jump position monitoring relay is in a closed state, the alarm circuit 300 is switched on, and a 'tripping circuit is disconnected' alarm signal is reported. In addition, because the on-position monitoring relay HWJ is connected in parallel at two ends of the interval protection tripping contact TJ, when the pressing plate LP is disconnected or has poor contact, the on-position monitoring relay HWJ loses power, the normally closed contact HWJ1 is closed, the alarm circuit 300 is conducted, and a 'tripping circuit disconnection' alarm signal is reported, so that the monitoring of the pressing plate LP is enhanced.
When the circuit breaker is positioned, the normally open auxiliary contact BG1 of the circuit breaker in the trip circuit 100 is disconnected, the trip circuit 100 is not conducted, the on-position monitoring relay HWJ is reset, and the normally closed contact HWJ1 of the on-position monitoring relay in the alarm circuit 300 is closed; meanwhile, a normally closed auxiliary contact BG2 of a breaker in the closing circuit 200 is closed, a jump position monitoring relay TWJ is excited, and a normally closed contact TWJ1 of a jump position monitoring relay connected in series in the alarm circuit 300 is disconnected; at this time, the alarm circuit 300 is not turned on, and the alarm signal of "close circuit open circuit" is not reported. As long as any point in the closing circuit 200 between the first power supply positive terminal 101 and the first end of the jump position monitoring relay TWJ and between the second end of the jump position monitoring relay TWJ and the first power supply negative terminal 102 is disconnected, the jump position monitoring relay TWJ loses power, the normally closed contact TWJ1 of the jump position monitoring relay TWJ is closed, and the normally closed auxiliary contact BG2 of the circuit breaker is closed at the moment, the normally open auxiliary contact BG1 of the circuit breaker is opened, so that the normally closed contact HWJ1 of the closing position monitoring relay is in a closed state, the alarm circuit 300 is switched on, and a closing circuit disconnection alarm signal is reported.
EXAMPLE five
With continued reference to fig. 4, a first end of the coil HWJ of the on monitoring relay is electrically connected to a first end a of the present interval protection trip contact TJ, and a second end of the coil HWJ of the on monitoring relay is electrically connected to a second end b of the present interval protection trip contact TJ.
Specifically, since the area where both ends of the coil HWJ of the on monitoring relay are connected between the trip circuits 100 belongs to the monitoring blind area, by electrically connecting the first end of the coil HWJ of the on monitoring relay with the first end a of the present interval protection trip contact TJ and electrically connecting the second end of the coil HWJ of the on monitoring relay with the second end b of the present interval protection trip contact TJ, both ends of the coil HWJ of the on monitoring relay can be infinitely close to the present interval protection trip contact TJ, so that there is and only one open point in the trip circuit, i.e., the present interval protection trip contact TJ, and the full range of the trip circuit 100 can be monitored in the case that the relay device has no protection action or manual trip.
Fig. 5 is an electrical connection schematic diagram of a tripping and closing monitoring circuit according to a fifth embodiment of the present invention. Referring to fig. 5, on the basis of the above embodiment, the first end of the coil HWJ of the on-position monitoring relay is electrically connected to the positive first power supply terminal 101, the second end of the coil HWJ of the on-position monitoring relay is electrically connected to the first end c of the pressure plate LP, and the second end d of the pressure plate LP is electrically connected to the normally open contact TBJ1 of the trip latching relay.
Specifically, in a normal case, the inter-space protection trip contact TJ is located in an internal plug of the protection device, which does not facilitate connection of the coil HWJ of the on-position monitoring relay, and therefore, the first end of the coil HWJ of the on-position monitoring relay may be electrically connected to the positive first power supply terminal 101, and the second end of the coil HWJ of the on-position monitoring relay 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 HWJ of the on-position monitoring relay must be close to the side of the first end c of the pressing plate LP to effectively monitor the connection condition of the pressing plate LP. The more infinitely the two ends of the coil HWJ of the on-position monitoring relay approach the present interval protection trip contact TJ, the more the full range of the trip circuit 100 can be monitored.
EXAMPLE six
The embodiment of the invention also provides a fault alarm method of the tripping and closing monitoring circuit, and fig. 6 is a flow chart of the fault alarm method of the tripping and closing monitoring circuit provided by the sixth embodiment of the invention. Referring to fig. 6, the method includes:
and step 110, when the circuit breaker is in a closed state, if the tripping circuit is disconnected, the tripping circuit monitoring relay is reset, and the normally closed contact of the tripping circuit monitoring relay is closed.
And step 120, reporting 'trip circuit disconnection' alarm information by the alarm circuit.
Fig. 7 is a flowchart of another fault alarm method for a tripping and closing monitoring circuit according to a sixth embodiment of the present invention. Referring to fig. 7, the method further includes:
and step 210, when the circuit breaker is in an off-position state, if the closing circuit is disconnected, the closing circuit monitoring relay is reset, and a normally closed contact of the closing circuit monitoring relay is closed.
And step 220, reporting the alarm information of 'closing circuit disconnection' by the alarm circuit.
Fig. 8 is a flowchart of another fault alarm method for a tripping and closing monitoring circuit according to a sixth embodiment of the present invention. Referring to fig. 8, the method further includes:
in step 310, the coil of the trip circuit monitoring relay is connected in parallel to two ends of the interval protection trip contact.
And step 320, if the pressing plate is broken or has poor contact, resetting the trip circuit monitoring relay, and closing the normally closed contact of the trip circuit monitoring relay.
And step 330, the alarm loop reports the alarm information of 'trip loop disconnection'.
The fault alarm method for the tripping and closing monitoring circuit provided by the sixth embodiment of the present invention can be executed by the tripping and closing monitoring circuit provided by any of the above embodiments, and therefore, the fault alarm method for the tripping and closing monitoring circuit provided by the sixth embodiment of the present invention has the beneficial effects of any of the above embodiments.
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 and close monitoring circuit, comprising: a tripping loop, a closing loop and an alarm loop;
the tripping circuit comprises a breaker normally-open auxiliary contact, a tripping coil, a tripping self-holding relay normally-open contact, a tripping self-holding relay coil, an on-position monitoring relay, the interval protection tripping contact, a pressing plate and a tripping circuit monitoring relay;
after the tripping latching relay normally-open contact, the tripping latching relay coil, the breaker normally-open auxiliary contact 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 coil of the on-position monitoring relay is connected in parallel with two ends of a branch circuit formed by the normally open contact of the tripping self-holding relay and the coil of the tripping self-holding relay;
the branch circuit formed by the interval protection tripping contact and the pressing plate is connected in parallel at two ends of the normally open contact of the tripping self-holding relay; the coil of the tripping circuit monitoring relay is connected in parallel with two ends of the interval protection tripping contact;
the switching-on loop comprises a breaker normally-closed auxiliary contact, a switching-on coil, a switching-on latching relay normally-open contact, a switching-on latching relay coil, a switching-on reset contact, a jumping position monitoring relay and a switching-on loop monitoring relay;
after the normally open contact of the closing self-holding relay, the closing self-holding relay coil, the normally closed auxiliary contact of the circuit breaker and the closing coil are sequentially and electrically connected, one end of the closing self-holding relay is electrically connected with the positive end of the first power supply, and the other end of the closing self-holding relay coil is electrically connected with the negative end of the first power supply;
the coil of the jump position monitoring relay is connected in parallel at two ends of a branch circuit formed by the normally open contact of the closing self-holding relay and the coil of the closing self-holding relay, and the coil of the closing loop monitoring relay is connected in parallel at two ends of the closing reset contact;
and the normally closed contact of the tripping circuit monitoring relay and the normally closed contact of the closing circuit monitoring relay are connected in series in the alarm circuit.
2. The trip and close monitoring circuit of claim 1, wherein a first end of the coil of the close circuit monitoring relay is electrically connected to a first end of the close recloser contact and a second end of the coil of the close circuit monitoring relay is electrically connected to a second end of the close recloser contact.
3. A trip-gate monitoring circuit as claimed in 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 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.
4. The trip-switch 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, a second end of the coil of the close-circuit monitoring relay is electrically connected to a first end of the pressure plate, and a second end of the pressure plate is electrically connected to the normally open contact of the trip latching relay.
5. A trip and close monitoring circuit, comprising: a tripping loop, a closing loop and an alarm loop;
the tripping loop comprises a breaker normally-open auxiliary contact, a tripping coil, a tripping self-holding relay normally-open contact, a tripping self-holding relay coil, an on-position monitoring relay, the interval protection tripping contact and a pressing plate;
after the tripping latching relay normally-open contact, the tripping latching relay coil, the breaker normally-open auxiliary contact 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 branch circuit formed by the interval protection tripping contact and the pressing plate is connected in parallel at two ends of the normally open contact of the tripping self-holding relay; the coil of the on-position monitoring relay is connected in parallel with two ends of the interval protection tripping contact;
the switching-on loop comprises a breaker normally-closed auxiliary contact, a switching-on coil, a switching-on latching relay normally-open contact, a switching-on latching relay coil, a switching-on reset contact and a tripping monitoring relay;
after the normally open contact of the closing self-holding relay, the closing self-holding relay coil, the normally closed auxiliary contact of the circuit breaker and the closing coil are sequentially and electrically connected, one end of the closing self-holding relay is electrically connected with the positive end of the first power supply, and the other end of the closing self-holding relay coil is electrically connected with the negative end of the first power supply;
the coil of the jump position monitoring relay is connected in parallel with two ends of the closing re-acting contact;
and the normally closed contact of the on-position monitoring relay and the normally closed contact of the skip position monitoring relay are connected in series in the alarm loop.
6. A trip monitoring circuit as claimed in claim 5 wherein a first end of the coil of the on 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 on monitoring relay is electrically connected to a second end of the local spaced apart protection trip contact.
7. The trip monitoring circuit of claim 5, 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 a first end of the pressure plate, and a second end of the pressure plate is electrically connected to the normally open contact of the trip latching relay.
8. A fault alarm method of a tripping and closing monitoring circuit, which is executed by the tripping and closing monitoring circuit according to any one of claims 1 to 4, and which comprises:
when the circuit breaker is in a closed state, if the tripping circuit is disconnected, the tripping circuit monitoring relay is reset, and a normally closed contact of the tripping circuit monitoring relay is closed;
and the alarm loop reports 'trip loop disconnection' alarm information.
9. The fault alarm method of the tripping and closing monitoring circuit according to claim 8, further comprising:
when the circuit breaker is in an off-position state, if the closing circuit is broken, the closing circuit monitoring relay is reset, and a normally closed contact of the closing circuit monitoring relay is closed;
and the alarm loop reports 'closing loop disconnection' alarm information.
10. The fault alarm method of the tripping and closing monitoring circuit according to claim 8, further comprising:
connecting the coil of the trip circuit monitoring relay in parallel at two ends of the interval protection trip contact;
if the pressing plate is broken or has poor contact, the tripping circuit monitoring relay is reset, and the normally closed contact of the tripping circuit monitoring relay is closed;
and the alarm loop reports 'trip loop disconnection' alarm information.
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| CN202010348321.6A CN111458633B (en) | 2020-04-28 | 2020-04-28 | Tripping and closing monitoring circuit and fault alarming method |
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| CN106841876B (en) * | 2017-03-27 | 2019-07-09 | 国网福建省电力有限公司 | A kind of monitoring method of relay protection outlet pressing plate |
| US11831141B2 (en) * | 2018-01-23 | 2023-11-28 | Hitachi Energy Ltd. | Dual coil armature for supervision relay of trip coil |
| CN109509658B (en) * | 2018-12-29 | 2019-09-24 | 国网北京市电力公司 | A kind of relay protection DC control circuit and its full working scope monitoring and fault early warning method |
| CN109782094A (en) * | 2019-02-14 | 2019-05-21 | 南京汇创电力科技有限公司 | A kind of relay protection tripping output clamping in-service monitoring method |
| CN110426625A (en) * | 2019-08-02 | 2019-11-08 | 刘韶俊 | A kind of computer operation case for substation |
| CN111060803A (en) * | 2019-12-10 | 2020-04-24 | 中国长江电力股份有限公司 | Circuit breaker tripping and closing circuit full-working-condition monitoring circuit |
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