CN106712017B - Double-bus secondary voltage switching circuit and self-holding circuit thereof - Google Patents
Double-bus secondary voltage switching circuit and self-holding circuit thereof Download PDFInfo
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- CN106712017B CN106712017B CN201710202304.XA CN201710202304A CN106712017B CN 106712017 B CN106712017 B CN 106712017B CN 201710202304 A CN201710202304 A CN 201710202304A CN 106712017 B CN106712017 B CN 106712017B
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Abstract
The application discloses a double-bus secondary voltage switching circuit and a self-holding circuit thereof; the self-holding circuit comprises a direct current power supply; first, second, third and four-way electronic loops connected with the positive electrode and the negative electrode of the direct current power supply; the I and II auxiliary switches are normally open and normally closed contacts; the first I female normally open contact of the I female double-position relay is synchronous with the normally open contact of the first action coil, and the II female double-position relay is the same; the normally-open and normally-closed contacts of the I master auxiliary switch, the normally-closed contact of the first reset coil, the normally-open contact of the action coil, the first action coil and the reset coil are respectively connected in series with the first and second electronic circuits; and the normally-open and normally-closed contacts of the II master auxiliary switch, the normally-open contacts of the second reset coil and the action coil, and the second action coil and the reset coil are respectively connected in series with the third and fourth electronic loops. The secondary voltage switching device can solve the problem of abnormal operation of the secondary voltage switching device caused by poor closing of the contact of the conventional auxiliary switch or voltage loss of the direct-current power supply.
Description
Technical Field
The application relates to the technical field of secondary voltage switching, in particular to a double-bus secondary voltage switching circuit and a self-holding circuit thereof.
Background
As shown in fig. 1, the secondary voltages from the I and II bus PTs 21 and 22 (Potential Transformer, voltage transformers) are required to be controlled by the auxiliary switch contacts of the bus isolation switches (I and II bus isolation switches 24 and 25) to collect, switch and output the secondary voltages from the PTs, so as to finally determine which section of the secondary voltage of the bus PT is used to supply power to each device in the feeder switch 26.
Specifically, fig. 1 is a circuit diagram of a primary electrical system of a high-voltage switch cabinet in a double-bus power supply mode provided in the prior art. As shown in fig. 1, the I master PT21 and the II master PT22 are connected to the I master and the II master, respectively, 24 is an I master isolating switch, and 25 is an II master isolating switch. As shown in fig. 2, for a high-voltage switch cabinet powered by double buses, the secondary voltage required by the high-voltage switch cabinet, whether the secondary voltage is the secondary protection measurement voltage or the secondary metering voltage, is output by a voltage transformer and passes through an I bus and an II bus respectively, and then passes through the secondary voltage switching device 20 controlled by auxiliary switch contacts of the I bus isolation switch 24 and the II bus isolation switch 25 in fig. 1 respectively, so as to realize collection, switching and output of the secondary voltage, and further determine which section of bus PT is specifically powered by the secondary voltage. The secondary voltage switching device 20 is arranged on the cabinet surface of the high-voltage switch cabinet, and the working process of a position relay in the secondary voltage switching device 20 is controlled by an auxiliary switch normally-open contact (G1 and G2) of an I master and II master isolating switch respectively; when the auxiliary switch normally-open contact G1 of the I master isolation disconnecting link is closed, the position relay 1YQ is connected with a normally-open contact of a circuit between the secondary voltage loop of the I master voltage transformer and the secondary voltage empty switch of the high-voltage switch cabinet, and similarly, when the auxiliary switch normally-open contact G2 of the II master isolation disconnecting link is closed, the position relay 2YQ is connected with a normally-open contact of a circuit between the secondary voltage loop of the II master voltage transformer and the secondary voltage empty switch of the high-voltage switch cabinet.
However, if the auxiliary switch related contact of the isolating switch on the bus is closed poorly and the loop thereof is broken, or the direct current power supply is fused, the direct current power supply fails, etc., the secondary voltage switching device may work abnormally, the switching relay is powered off, the internal contact is opened, and thus the relay protection device of the high-voltage switch cabinet may malfunction, fail to operate and the meter of electric energy metering may be missed.
Content of the application
The application provides a double-bus secondary voltage switching circuit and a self-holding circuit thereof, which are used for solving the problem that the secondary voltage switching device works abnormally when an auxiliary switch contact of an isolation disconnecting link works abnormally or a direct current power supply loses voltage in the prior art.
In a first aspect, the present application provides a self-holding circuit for switching a secondary voltage of a double bus, including: a direct current power supply; the first power-on loop and the second power-on loop are respectively connected between the two ends of the positive electrode and the negative electrode of the direct-current power supply; the auxiliary switch contact of the I female isolation disconnecting link and the I female double-position relay are sequentially connected in series with the first power-on loop; the auxiliary switch contact of the II female isolation disconnecting link and the II female double-position relay are sequentially connected in series with the second power-on loop; the first power-on circuit comprises a first power-on electronic circuit and a second power-on electronic circuit; the auxiliary switch contact of the I master isolating switch comprises a normally open contact of the I master auxiliary switch and a normally closed contact of the I master auxiliary switch; the I-parent double-position relay comprises a first I-parent normally-open contact, a first action coil, a first reset coil, a first action coil normally-open contact and a first reset coil normally-closed contact, wherein the first I-parent normally-open contact and the first action coil normally-open contact are synchronous switches; the normally-closed contact of the I auxiliary switch, the normally-closed contact of the first action coil and the first return coil are connected in series to the first power-on electronic loop, and the normally-closed contact of the I auxiliary switch, the normally-open contact of the first action coil and the first return coil are connected in series to the second power-on electronic loop; the second energizing circuit comprises a third electronic circuit and a fourth electronic circuit; the auxiliary switch contact of the II master isolating switch comprises a normally open contact of the II master isolating switch and a normally closed contact of the II master isolating switch; the second-type double-position relay comprises a second-type normally-open contact, a second action coil, a second reset coil, a second action coil normally-open contact and a second reset coil normally-closed contact, wherein the second-type normally-open contact and the second action coil normally-open contact are synchronous switches; the normally-open contact of the II auxiliary switch, the normally-closed contact of the second return coil and the second action coil are connected in series with the third electronic circuit, and the normally-closed contact of the II auxiliary switch, the normally-open contact of the second action coil and the second return coil are connected in series with the fourth electronic circuit.
With reference to the first aspect, in a first optional implementation manner of the first aspect, the self-holding circuit for switching the secondary voltage of the double bus further includes: an I master voltage indicator lamp connected in series with the normally open contact of the I master auxiliary switch and connected in parallel with the I master double-position relay; and the II master voltage indicator lamp is connected with the normally open contact of the II master auxiliary switch in series and is connected with the II master double-position relay in parallel.
With reference to the first aspect, in a second optional implementation manner of the first aspect, the I-female two-position relay further includes a second I-female normally-open contact, where the second I-female normally-open contact and the first action coil normally-open contact are synchronous switches; the second II female double-position relay further comprises a second II female normally-open contact, wherein the second II female normally-open contact and the second action coil normally-open contact are synchronous switches; the self-holding circuit for switching the secondary voltage of the double bus also comprises a secondary voltage switching relay simultaneous action alarm circuit, and the secondary voltage switching relay simultaneous action alarm circuit comprises: the third three-way electric loop and the secondary voltage switching simultaneous action alarm device are connected to the two ends of the positive electrode and the negative electrode of the direct-current power supply; the second I normally open contact, the second II normally open contact and the secondary voltage switching simultaneous action alarm device are sequentially connected in series to the third three-way circuit.
With reference to the second implementation manner of the first aspect, in a third optional implementation manner of the first aspect, the secondary voltage switching simultaneous operation alarm device includes a secondary voltage switching simultaneous operation alarm indicator lamp.
With reference to the second implementation manner of the first aspect, in a fourth optional implementation manner of the first aspect, the self-holding circuit for switching the secondary voltage of the dual bus further includes: the I-bus auxiliary switch normally-closed contact temporary short-circuiting device is electrically connected with the secondary voltage switching and simultaneous action alarm device; and a normally closed contact temporary short-circuiting device of the secondary auxiliary switch II electrically connected with the secondary voltage switching and simultaneous action alarm device; the device comprises a first auxiliary switch normally-closed contact temporary short-circuiting device, a second auxiliary switch normally-closed contact temporary short-circuiting device and a third auxiliary switch normally-closed contact temporary short-circuiting device, wherein the first auxiliary switch normally-closed contact temporary short-circuiting device is connected to two ends of a first auxiliary switch normally-closed contact, and the second auxiliary switch normally-closed contact temporary short-circuiting device is connected to two ends of a second auxiliary switch normally-closed contact.
With reference to the fourth implementation manner of the first aspect, in a fifth optional implementation manner of the first aspect, the self-holding circuit for switching the secondary voltage of the dual bus further includes: the first reset coil work indicating device is connected in series with the second communication electronic loop; and the second return coil work indicating device is connected in series with the fourth electronic circuit.
With reference to the fifth implementation manner of the first aspect, in a sixth optional implementation manner of the first aspect, the I-bus auxiliary switch normally-closed contact temporary short-circuit device is further electrically connected to the first return coil operation indicating device; and the normally closed contact temporary short-circuiting device of the II-type auxiliary switch is also electrically connected with the second resetting coil work indicating device.
With reference to the fifth implementation manner of the first aspect, in a seventh optional implementation manner of the first aspect, the first return coil operation indicating device includes a first return coil operation indicating lamp; the second return coil work indicating device comprises a second return coil work indicating lamp.
In a second aspect, the present application provides a dual bus secondary voltage switching circuit, comprising:
a self-holding circuit for switching the secondary voltage of the double buses, wherein the self-holding circuit comprises a secondary voltage bus of the I-type voltage transformer, a secondary voltage bus of the II-type voltage transformer, a secondary voltage air switch of a high-voltage switch cabinet and any one of the technical schemes; the secondary voltage bus of the I primary voltage transformer is electrically connected with the secondary voltage air switch of the high-voltage switch cabinet through a first secondary electric loop; the secondary voltage bus of the II-type voltage transformer is electrically connected with a secondary voltage air switch of the high-voltage switch cabinet through a second secondary electric loop;
The first I-bus normally open contact of the I-bus double-position relay is connected in series with a first secondary electric loop between a secondary voltage bus of the I-bus voltage transformer and a secondary voltage air switch of the high-voltage switch cabinet; and a first II-type normally open contact of the II-type female double-position relay is connected in series with a second secondary electric loop between a II-type secondary voltage bus of the II-type voltage transformer and a secondary voltage air switch of the high-voltage switch cabinet.
The working process of the double-bus secondary voltage switching circuit and the self-holding circuit thereof provided by the technical scheme of the application is as follows:
when the I female isolation disconnecting link is in closing operation, if the normally open contact of the auxiliary switch of the I female isolation disconnecting link is closed, the first action coil of the I female double-position relay is electrified to work, and according to the working principle of the double-position relay, the first I female normally open contact of the I female double-position relay is closed and self-maintained, so that the secondary protection measurement voltage from the secondary voltage bus of the I female voltage transformer is connected to a first secondary electric loop between the secondary voltage air switch of the high-voltage switch cabinet through the first I female normally open contact. However, due to the self-holding function of the I-master double-position relay, the first I-master normally open contact of the I-master double-position relay is still self-held in a closed state even if the first action coil is powered off. Only when the I master isolating switch performs switching-off operation, the normally closed contact of the auxiliary switch of the corresponding I master isolating switch is reset and closed, the second on-state electronic circuit where the first reset coil of the I master double-position relay is located is connected, only the first reset coil is electrified, and the first I master normally open contact of the I master double-position relay can be disconnected, so that the secondary electric circuit (the same secondary metering voltage) between the secondary voltage bus of the I master voltage transformer and the secondary voltage air switch of the high-voltage switch cabinet is cut off. The device solves the problems that in the prior art, the normally open contact of an I female auxiliary switch of an I female isolation disconnecting link is poor in closing, a loop is broken, a direct current power supply is fused in a safety way or the direct current power supply is in power failure, and the like, so that the action coil of the I female position relay is powered off, and the normally open contact of the I female position relay is disconnected, and the relay protection device in a high-voltage switch cabinet possibly causes the situations of misoperation protection, failure (or electric energy metering missing meter) and the like due to the fact that secondary voltage is lost. For the II-type double-position relay, the working principle of the secondary voltage switching circuit controlled by the auxiliary switch contact is the same as that of the I-type double-position relay when the II-type isolating switch is switched on and off.
According to the technical scheme, when the isolating knife switch is in a closing operation, through the self-holding function of the double-position relay, even if the normally open contact of the auxiliary switch of the operated I-master or II-master isolating knife switch is poorly closed or the direct current power supply is out of voltage, the self-holding function of the secondary voltage switching circuit can still be realized by the I-master or II-master double-position relay, the first I-master normally open contact of the I-master double-position relay or the first II-master normally open contact of the II-master double-position relay can still be kept in a closed state, and further, the secondary voltage of the I-master or II-master voltage transformer can be ensured to output reliable protection measurement voltage (or metering voltage) to the high-voltage switch cabinet through the self-holding circuit, and misoperation and refusal of a relay protection device (or the condition of an electric energy metering leakage meter) in the high-voltage switch cabinet can be effectively avoided.
When the I or II master isolating switch performs switching-off operation, the normally closed contact of the auxiliary switch of the corresponding I or II master isolating switch is reset and closed, the power-on loop of the first reset coil of the I master double-position relay or the power-on loop of the second reset coil of the II master double-position relay are respectively connected, the first reset coil or the second reset coil is powered on, and the first I normally open contact of the I master double-position relay or the first II normally open contact of the II master double-position relay can be disconnected, so that the secondary electric loop between the secondary voltage bus of the I or II master voltage transformer and the secondary voltage air switch of the high-voltage switch cabinet can be cut off, and the switching of secondary voltage is realized.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a circuit diagram of a primary electrical system of a high-voltage switch cabinet in a double-bus power supply mode provided in the prior art;
FIG. 2 is a schematic diagram of an electrical connection circuit of a secondary voltage switching circuit according to the prior art;
fig. 3 is a wiring diagram of a self-holding circuit for switching secondary voltage of a double bus provided in an embodiment of the present application;
FIG. 4 is a diagram of the electrical connection of a dual position relay of either the I or II parent in the embodiment of FIG. 3;
fig. 5 is a schematic diagram of an indicator light on a panel of a dual-bus secondary voltage switching device.
The correspondence between the structure names and the reference numerals in the embodiments shown in fig. 1 to 5 is as follows:
1-DC power supply, 2-first power-on loop, 21-first power-on sub-loop, 22-second power-on sub-loop, 3-second power-on loop, 31-third power-on loop, 32-fourth power-on loop, 4-I isolating switch auxiliary switch contact, 41-I auxiliary switch normally-open contact, 42-I auxiliary switch normally-closed contact, 5-I master double-position relay, 51-first I master normally-open contact, 52-first action coil, 53-first action coil normally-open contact, 54-first return coil, 55-first return coil normally-closed contact, 56-second I master normally-open contact, 6-II isolating switch auxiliary switch contact, 61-II auxiliary switch normally-open contact, 62-II master auxiliary switch normally-closed contact 7-II female double-position relay, 71-first II female normally open contact, 72-second action coil, 73-second action coil normally open contact, 74-second return coil, 75-second return coil normally closed contact, 76-second II female normally open contact, 8-I female voltage indicator lamp, 9-II female voltage indicator lamp, 10-secondary voltage switching relay simultaneous operation alarm circuit, 101-third electric loop, 102-secondary voltage switching simultaneous operation alarm device, 1021-secondary voltage switching simultaneous operation alarm indicator lamp, 11-I female auxiliary switch normally closed contact temporary short circuit device, 12-II female auxiliary switch normally closed contact temporary short circuit device, 13-first return coil work indicator lamp, 131-first return coil work indicator lamp, 14-second return coil work indicating device, 141-second return coil work indicating lamp, 15-I master voltage transformer secondary voltage bus, 16-II master voltage transformer secondary voltage bus, 17-high voltage switch cabinet secondary voltage air switch, 18-first secondary electric loop, 19-second secondary electric loop, 20-secondary voltage switching device, 21-I master voltage transformer, 22-II master voltage transformer, 23-master link circuit breaker, 24-I master isolation disconnecting link, 25-II master isolation disconnecting link and 26-feed-out wire switch cabinet.
Detailed Description
Referring to fig. 3, a wiring diagram of a self-holding circuit for switching a secondary voltage of a double bus provided in an embodiment of the present application, as shown in fig. 3, the self-holding circuit for switching a secondary voltage of a double bus includes:
a direct current power supply 1;
the dc power supply 1 is configured to provide a working power supply voltage for components such as an I-female isolating switch auxiliary switch contact 4, a II-female isolating switch auxiliary switch contact 6, an I-female dual-position relay 5, and an II-female dual-position relay 7, where the power supply voltage of the dc power supply 1 may be 220V.
A first energizing circuit 2 and a second energizing circuit 3 respectively connected between the positive electrode and the negative electrode of the direct current power supply 1;
an auxiliary switch contact 4 of the I female isolation disconnecting link and an I female double-position relay 5 which are sequentially connected in series with the first energizing circuit 2; and an auxiliary switch contact 6 of the II female isolation disconnecting link and a II female double-position relay 7 which are sequentially connected in series with the second power-on circuit 3;
the first energizing circuit 2 includes a first energizing sub-circuit 21 and a second energizing sub-circuit 22; the first power-on electronic circuit 21 is used for connecting a normally-open contact 41 of an I-master auxiliary switch, a normally-closed contact 55 of a first reset coil of the I-master dual-position relay 5 and a first action coil 52, which are described below; the second electronic circuit 22 is used for connecting the normally closed contact 42 of the I-master auxiliary switch, the normally open contact 53 of the first operating coil of the I-master dual-position relay 5 and the first return coil 54.
By the above connection, the I-master auxiliary switch normally open contact 41 can control the first operating coil 52, and the ii-master auxiliary switch normally open contact 42 can control the first return coil 54.
The auxiliary switch contact 4 of the I female isolating switch comprises a normally open contact 41 of the I female auxiliary switch and a normally closed contact 42 of the I female auxiliary switch; when the I female isolation disconnecting link is not switched on and transmits power, the normally open contact 41 of the I female auxiliary switch is in an open state, and the normally closed contact 42 of the I female auxiliary switch is in a closed and communicated state.
The I-master dual-position relay 5 includes a first I-master normally open contact 51, a first action coil 52, a first return coil 54, a first action coil normally open contact 53, a first return coil normally closed contact 55, and a second I-master normally open contact 56, wherein the first I-master normally open contact 51, the first action coil normally open contact 53, and the second I-master normally open contact 56 are all synchronous switches that can be synchronously closed or opened. Specifically, when the I-parent isolation switch auxiliary switch contact 41 is not closed, the first operating coil 52 fails to be energized, and at this time, the first operating coil normally open contact 53 is in an open state, and the first return coil normally closed contact 55 is in a closed state.
The secondary voltage switching operation process of the I-master dual-position relay 5 in fig. 3 is described below by way of example with reference to the structure and the working principle of the dual-position relay shown in fig. 4, and by way of example, the switching operation and the switching operation of the I-master isolation switch are as follows: the first action coil 52 is connected in series with a first return coil normally-closed contact 55, and the first return coil 54 is connected in series with a first action coil normally-open contact 53; when the I master isolating knife switch is switched on, the first action coil 52 of the I master double-position relay 5 is electrified, namely, the first action coil is electrified instantly, and the normally open contact 53 of the first action coil is closed and communicated, so that the corresponding first reset coil 54 is in a ready-to-be-electrified state; meanwhile, the normally-closed contact 55 of the first return coil is disconnected, so that the first action coil 52 is powered off; meanwhile, the first I female normally open contact 51 of the I female double-position relay is closed and is self-maintained, and the secondary protection measurement voltage output by the I female voltage transformer can still be reliably output to the secondary protection measurement voltage loop of the high-voltage switch cabinet through the first secondary electric loop 18 of the self-maintaining circuit, so that misoperation and refusal of the relay protection device, which are possibly caused by voltage loss of the secondary voltage, of the switch cabinet are effectively avoided. The method solves the problems of bad closing, loop disconnection, direct current power switch disconnection (insurance fusing) or direct current power failure of the normally open contact G1 of the I master auxiliary switch of the I master isolating switch in the prior art shown in fig. 2, which cause the coil of the I master position relay 1YQ to lose electricity, so that the normally open contact of the I master position relay is disconnected, and the relay protection device in the high-voltage switch cabinet possibly causes protection misoperation, refusal operation and the like due to secondary voltage loss. Of course, the second I female normally open contact 56 of the I female dual position relay 5 of fig. 3 is also closed and closed at the same time, depending on the structure and operating principle of the dual position relay.
Only when the I-bus isolating knife switch is operated for opening, the normally closed contact 42 of the auxiliary switch of the corresponding I-bus isolating knife switch is reset to the closed and on state, so that the electric loop of the first reset coil 54 of the I-bus double-position relay 5 is connected, the first reset coil 54 is electrified, the first I-bus normally open contact 51 of the I-bus double-position relay 5 can be disconnected, and the first secondary electric loop 18 between the secondary voltage bus 15 of the I-bus voltage transformer and the secondary voltage air switch 17 of the high-voltage switch cabinet is cut off. Of course, according to the structure and operation principle of the dual-position relay, the first action coil normally open contact 53 and the second I-master normally open contact 56 of the I-master dual-position relay 5 are also opened accordingly.
The second energizing circuit 3 includes a third electronic circuit 31 and a fourth electronic circuit 32.
The auxiliary switch contact 6 of the II-type isolating switch comprises a normally open contact 61 of the II-type auxiliary switch and a normally closed contact 62 of the II-type auxiliary switch.
The II master dual position relay 7 includes a first II master normally open contact 71, a second action coil 72, a second return coil 74, a second action coil normally open contact 73, a normally closed contact 75 of the second return coil 74, and a second II master normally open contact 76, wherein the first II master normally open contact 71, the second II master normally open contact 76, and the second action coil normally open contact 73 are all synchronous switches.
The normally-open contact 61 of the II-type auxiliary switch, the normally-closed contact 75 of the second return coil and the second action coil 72 are sequentially connected in series with the third electronic circuit 31, and the normally-closed contact 62 of the II-type auxiliary switch, the normally-open contact 73 of the second action coil and the second return coil 74 are sequentially connected in series with the fourth electronic circuit 32.
The working principle of the II-type double-position relay 7 and the II-type isolation switch secondary voltage switching working process are the same as those of the I-type double-position relay 5 and the I-type isolation switch secondary voltage switching working process, and will not be described in detail here.
In addition, if the high-voltage load of the current high-voltage switch cabinet is supplied by the I-bus isolation disconnecting link, that is, the I-bus isolation disconnecting link is in a closing and power transmission running state, the I-bus auxiliary switch normally-open contact 41 is in a closing and on state, the first action coil 52 of the I-bus dual-position relay 5 is powered, the first I-bus normally-open contact 51 thereof is kept closed and maintained, and the first secondary electric loop 18 is connected. When the high-voltage load of the high-voltage switch cabinet needs to be switched from the power supply of the I female isolation disconnecting link to the power supply of the II female isolation disconnecting link, the I female disconnecting link and the II female disconnecting link are subjected to ring closing operation firstly, namely, after the I female disconnecting link and the II female disconnecting link are completed, the II female auxiliary switch normally open contact 61 of the II female isolation disconnecting link is in a closed and on state, the second action coil 72 of the II female double-position relay 7 is powered, the first II female normally open contact 71 is closed and self-maintained, and the second secondary electric loop 19 is connected. Thus, the secondary voltage of the I-type voltage transformer and the secondary voltage of the II-type voltage transformer are in a parallel operation state. At this time, the I-bus isolation knife switch is operated to switch off, the I-bus auxiliary switch Guan Changbi contact 42 of the I-bus isolation knife switch is reset to the closed and on state, the first reset coil 54 of the I-bus dual-position relay 5 is powered on, and according to the working principle of the dual-position relay 5, the first I-bus normally open contact 51 of the I-bus dual-position relay 5 is opened, so that the secondary protection measurement voltage output by the I-bus voltage transformer secondary voltage bus 15 to the high-voltage switch cabinet is cut off, i.e., the first secondary electrical loop 18 is opened. And finally, the secondary protection measurement voltage is output to the high-voltage switch cabinet by the secondary voltage bus 16 of the II-type voltage transformer.
In summary, in the self-holding circuit for switching the secondary voltage of the double bus provided by the embodiment of the application, when the I bus or the II bus isolation disconnecting link is in a closed state, the first I bus normally open contact 51 of the I bus double-position relay 5 or the first II bus normally open contact 71 of the II bus double-position relay 7 can be kept in a closed state by the self-holding function of the I bus or the II bus double-position relay; the circuit solves the problems of bad closing of normally open contacts, loop disconnection, disconnection (fuse blowing) of a direct current power supply switch, power failure of a direct current power supply and the like of an I female or II female auxiliary switch in an I female or II female isolation disconnecting link, and the like in the prior art, which are shown in fig. 2, so that the normally open contacts of the I female or II female position relay are disconnected, and the situations of protection misoperation, power rejection and the like possibly caused by loss of secondary voltage of a relay protection device in a high-voltage switch cabinet are possibly caused.
Only when the I or II master isolating knife switch performs the opening operation, the normally closed contact of the corresponding I or II master auxiliary switch is reset to be in a closed and on state, the power-on loop of the first reset coil 54 of the I master double-position relay 5 or the power-on loop of the second reset coil 74 of the II master double-position relay 7 is respectively connected, the first reset coil 54 or the second reset coil 74 is powered on, the first I master normally open contact 51 of the I master double-position relay 5 or the first II master normally open contact 71 of the II master double-position relay 7 can be disconnected, and thus the secondary electric loop between the secondary voltage bus of the I master or II master voltage transformer and the secondary voltage air switch 17 of the high-voltage switch cabinet is cut off.
In addition, in order to make a monitoring person clearly know whether the normally open contact 41 of the I-bus auxiliary switch or the normally open contact 61 of the II-bus auxiliary switch is already closed and intact when the I-bus or II-bus isolating switch is in a closing power transmission operation, further know whether the first I-bus normally open contact 51 or the first II-bus normally open contact 71 is kept in a closed state, and further know whether the self-holding circuit for switching the secondary voltage of the double bus makes the secondary protection measurement voltage sent by the secondary voltage bus 15 of the I-bus voltage transformer and the secondary protection measurement voltage sent by the secondary voltage bus 16 of the II-bus voltage transformer be communicated to the secondary protection measurement voltage electric loop of the high-voltage switch cabinet; as a preferred embodiment, as shown in fig. 3, the self-holding circuit for switching the secondary voltage of the double bus provided in this embodiment further includes:
and an I master voltage indicator lamp 8 connected in series with the normally open contact 41 of the I master auxiliary switch and connected in parallel with the I master double position relay 5. The I master voltage indicator lamp 8 is connected with the normally open contact 41 of the I master auxiliary switch in series, namely is connected to the first power-on electronic loop 21, and can be electrified and lightened when the normally open contact 41 of the I master auxiliary switch is closed, so that an indication that the normally open contact 41 of the I master auxiliary switch is closed is sent out, and the high-voltage load of the high-voltage switch cabinet is supplied by the I master isolation disconnecting link is indicated; when the normally open contact 41 of the I master auxiliary switch is closed, if the I master double-position relay 5 works normally, the first I master normally open contact 51 of the I master double-position relay 5 is closed and self-maintained, so that the secondary protection measurement voltage from the secondary voltage bus 15 of the I master voltage transformer is connected to the secondary voltage air switch 17 of the high-voltage switch cabinet; therefore, the I-bus voltage indicator lamp 8 can indirectly indicate the working condition of the first I-bus normally-open contact 51, so that a monitoring person can clearly know the working states of the I-bus double-position relay 5 and the first I-bus normally-open contact 51 thereof.
And a II master voltage indicator lamp 9 connected in series with the II master auxiliary switch normally open contact 61 and connected in parallel with the II master dual position relay 7. The II master voltage indicator lamp 9 is connected with the normally open contact 61 of the II master auxiliary switch in series, namely is connected to the third three-way electronic circuit 31, and can be electrified and lightened when the normally open contact 61 of the II master auxiliary switch is closed, so that an indication that the normally open contact 61 of the II master auxiliary switch is closed is sent out, and the high-voltage load of the high-voltage switch cabinet is supplied by the II master isolating knife switch; when the normally open contact 61 of the secondary voltage bus 16 of the secondary voltage transformer is closed, if the secondary double-position relay 7 works normally, the first secondary normally open contact 71 of the secondary double-position relay 7 is closed and self-maintained, so that the secondary protection measurement voltage from the secondary voltage bus 16 of the secondary voltage transformer is connected to the secondary voltage air switch 17 of the high-voltage switch cabinet; therefore, the II-type female voltage indicator lamp 9 can indirectly indicate the operation condition of the first II-type female normally-open contact 71, so that the monitoring personnel can clearly know the operation conditions of the II-type female double-position relay 7 and the first II-type female normally-open contact 71 therein.
In conclusion, through setting up the female voltage indicator lamp 8 of I and the female voltage indicator lamp 9 of II, can make the supervisor clearly know the break-make condition of the female auxiliary switch normally open contact of I and II to and the behavior of the female double position relay of corresponding I and II. And knows whether the high-voltage load of the high-voltage switch cabinet is supplied by the isolating switch of the I bus or the II bus.
In addition, for the power supply of the high-voltage double buses, if the normally closed contact 42 of the I-bus auxiliary switch is in poor contact or is not in reset closing connection when the I-bus isolating switch is in switching-off operation after the I-bus load is inverted to be powered by the II-bus, the first I-bus normally open contact 51 of the I-bus double-position relay 5 is still in a closed state and the secondary protection measurement voltage from the I-bus voltage transformer secondary voltage bus 15 and the secondary protection measurement voltage from the II-bus voltage transformer secondary voltage bus 16 are in a parallel running state if the first reset coil 54 of the I-bus double-position relay 5 fails to get power. At this time, the bus-tie breaker 23 in fig. 1 must still be in a closing state, if the bus-tie breaker 23 is disconnected at this time, the high voltage of the I bus will be cut off and lose voltage, a larger potential difference will be generated between the high voltages of the two sections of the I bus and the II bus, a larger circulation will be formed in the secondary voltage switching loop, which directly leads to the secondary voltage air switch of the two bus voltage transformers to trip or fuse, so that the protection measurement and control device cannot adopt the secondary protection voltage, and may cause protection malfunction or refusal operation, even reverse charging burns out the voltage transformer.
In order to avoid the above-mentioned problems in time, as shown in fig. 3, the self-holding circuit for switching the secondary voltage of the double bus provided in this embodiment further includes a secondary voltage switching relay simultaneous operation alarm circuit 10, and the secondary voltage switching relay simultaneous operation alarm circuit 10 includes: a third three-way current loop 101 connected to both ends of the positive and negative electrodes of the direct current power supply 1 and a secondary voltage switching simultaneous operation alarm device 102.
The second I normally open contact 56, the second II normally open contact 76, and the secondary voltage switching and simultaneous action alarm device 102 are sequentially connected in series to the third three-way electric loop 101. Because the second I and II female normally open contacts 56 and 53 are synchronous switches and the second II and II female normally open contacts 76 and 73 are synchronous switches, when both the I and II female isolation switches are fully closed, the second I and II female normally open contacts 56 and 76 will also be closed, resulting in a secondary voltage switch while the action alarm device 102 can perform an early warning.
In summary, the secondary voltage switching simultaneous action alarm device 102 is capable of performing early warning on the first action coil 52 of the I-bus dual-position relay 5 and the second action coil 72 of the II-bus dual-position relay 7 simultaneously, when the I-bus dual-position secondary voltage switching relay performs early warning on the II-bus dual-position secondary voltage switching relay, it indicates that the secondary protection measurement voltage loop from the I-bus voltage transformer secondary voltage bus 15 and the secondary protection measurement voltage loop from the II-bus voltage transformer secondary voltage bus 16 are in parallel operation states, which means that in the operation process of closing and switching the buses between the I-bus and the II-bus, when the I-bus isolating switch or the II-bus isolating switch is opened (at this time, the bus-tie breaker 23 between the I-bus and the II-bus and the isolating switch on both sides thereof are affirmative in the closed position), the I-bus auxiliary switch contact 42 or the II-bus auxiliary switch contact 62 is not closed and closed, so that the first reset coil 54 in the I-bus dual-position relay 5 or the second reset coil 74 of the II-bus dual-position relay 7 is not closed, i.e. the first reset coil 54 in the I-bus dual-position relay 5 or the second reset coil 74 of the I-bus contact 7 is not closed and the normally open at the first contact point of the II-bus contact 7 is opened at the time, I-bus contact 7 is opened and the first contact between the I-bus contact 7 and the first contact 7 and the II-bus contact is not normally opened. At the moment, an operator is reminded of being incapable of disconnecting the busbar breaker 23 between the busbar I and the busbar II, and then occurrence of faults of the secondary voltage loop can be effectively avoided.
Alternatively, as shown in fig. 3, the secondary voltage switching simultaneous-action warning device 102 includes a secondary voltage switching simultaneous-action warning indication lamp 1021. By setting the secondary voltage switching and simultaneously operating the alarm indication lamp 1021, alarm information can be timely indicated to operators, and the operators can be timely prevented from disconnecting the bus-tie breaker 23, so that the occurrence of secondary voltage loop faults is prevented.
In this case, in order to prevent the occurrence of a secondary circuit fault caused by opening the bus bar breaker 23 between the I and II bus bars, as a preferred embodiment, the self-holding circuit for switching the secondary voltage of the double bus bar provided in the embodiment shown in fig. 3 further includes:
and the normally-closed contact temporary short-circuiting device 11 of the I-bus auxiliary switch.
The temporary short-circuiting device 11 for the normally-closed contact of the I auxiliary switch is connected to two ends of the contact 42 of the I auxiliary switch Guan Changbi and is used for shorting the lines at two ends of the normally-closed contact 42 of the I auxiliary switch. When the I female load performs ring closing and bus inverting operation on the II female, and the I female isolation disconnecting link and the II female isolation disconnecting link are in a closing operation state (at this time, the bus-bar circuit breaker 23 between the I female and the II female and the isolation disconnecting links on the two sides of the I female are in a closing position), when the I female isolation disconnecting link is completed to perform a disconnecting operation, if the normally closed contact 42 of the I female auxiliary switch is reset to be in poor contact, the first reset coil 54 of the I female double-position relay 5 cannot be electrified, according to the working principle of the double-position relay, the first I normally open contact 51 of the I female double-position relay 5 cannot be timely disconnected, and a secondary protection measurement voltage loop from the I female voltage transformer secondary voltage bus 15 and a secondary protection measurement voltage loop from the II female voltage transformer secondary voltage bus 16 still are in a parallel operation state. At this time, the second I and second II normally open contacts 56 and 76 are both closed to turn on the third three-way electric circuit 101, and the secondary voltage switching and operation alarm lamp 1021 is turned on, so as to send an alarm message to the operator that the secondary voltage switching relay is simultaneously operated. Before the bus-tie breaker 23 between the I bus and the II bus is disconnected, the temporary short-circuiting device 11 of the normally-closed contact of the I bus auxiliary switch is used for shorting the two ends of the normally-closed contact 42 of the I bus auxiliary switch, so that the first reset coil 54 of the I bus double-position relay 5 is electrified, the first I bus normally-open contact 51 of the I bus double-position relay 5 is timely disconnected, and the situation that after the bus-tie breaker between the I bus and the II bus is disconnected, a large potential difference is generated between the high voltage of the I bus and the high voltage of the II bus, a large circulation current is generated in a secondary voltage switching loop, and a secondary voltage loop fault caused by the current is generated is avoided. Standby may further handle failure of the normally closed contact 42 of the I-bus auxiliary switch.
And a normally closed contact temporary shorting device 12 of the II parent auxiliary switch.
The temporary short-circuiting device 12 for the normally-closed contact of the secondary II switch is connected to two ends of the normally-closed contact 62 of the secondary II switch and is used for shorting lines at two ends of the normally-closed contact 62 of the secondary II switch. When the II busbar load performs loop closing and busbar inverting operation on the I busbar, and the I busbar isolating disconnecting link and the II busbar isolating disconnecting link are in a closing operation state (at the moment, the busbar isolating circuit breaker 23 between the I busbar and the II busbar and isolating disconnecting links on two sides of the busbar isolating circuit breaker are in a closing position, and when the II busbar isolating disconnecting link is completed to perform opening operation, if the normally closed contact 62 of the II busbar auxiliary switch is reset to be in poor closed contact, the second reset coil 74 of the II busbar double-position relay 7 cannot obtain electricity; according to the working principle of the dual-position relay, the first II normally open contact 71 of the II-bus dual-position relay 7 fails to be opened timely, and the secondary protection measurement voltage from the II-bus voltage transformer secondary voltage bus 16 and the secondary protection measurement voltage loop from the I-bus voltage transformer secondary voltage bus 15 will still be in a parallel operation state. At this time, the second I and second II normally open contacts 56 and 76 are both closed to turn on the third three-way electric circuit 101, and the secondary voltage switching and operation alarm lamp 1021 is turned on, so as to send an alarm message to the operator that the secondary voltage switching relay is simultaneously operated. Before the bus-tie breaker 23 between the I bus and the II bus is disconnected, the two ends of the normally closed contact 62 of the II bus auxiliary switch are short-circuited by the normally closed contact temporary short-circuiting device 12 of the II bus auxiliary switch, so that the second reset coil 74 of the II bus double-position relay 7 is powered on, the first II bus normally open contact 71 of the II bus double-position relay 7 is timely disconnected, a larger potential difference is avoided between the I bus and the II bus after the bus-tie breaker 23 between the I bus and the II bus is disconnected, and a larger circulation current is generated in the secondary voltage switching loop, so that a secondary voltage loop fault occurs. Standby may further handle failure of the normally closed contact 62 of the II master auxiliary switch.
For reducing I female isolation switch or II female isolation switch in separating brake operation in-process, because I female auxiliary switch normally closed contact 42 or II female auxiliary switch normally closed contact 62 work is not in place, the harm of the secondary voltage return circuit circulation of two generating line voltage transformer PT that probably leads to, the self preservation that this application embodiment provided two generating line secondary voltage switched over still includes:
the first return coil work indicating device 13 is connected in series with the second electronic circuit 22. And a second return coil operation indicating device 14 connected in series with the fourth electronic circuit 32.
The first return coil work indicating device 13 is connected in series with the second electronic circuit 22, and since the second electronic circuit 22 is connected in series with the I-bus auxiliary switch normally-closed contact 42, the first action coil normally-open contact 53 and the first return coil 54, when the I-bus isolation switch is operated to open, if the I-bus auxiliary switch normally-closed contact 42 is closed and closed again, the second electronic circuit 22 is turned on, and the first return coil work indicating device 13 can send an indication signal for energizing the first return coil 54. When the I-bus isolating switch is operated, if the normally closed contact 42 of the I-bus auxiliary switch is not normally closed, the first return coil work indicating device 13 will not send an indication signal for energizing the first return coil 54, so that an operator can early warn about the failure of the normally closed contact 42 of the I-bus auxiliary switch. Similarly, the second return coil operation indication device 14 can send out an indication signal of the second return coil 74 when the normally closed contact 62 of the II auxiliary switch is returned to be closed and turned on, and can not send out an indication signal of the second return coil 74 when the normally closed contact 62 of the II auxiliary switch is returned to be closed poorly, so that an operator can early warn about the poor closing condition of the normally closed contact 62 of the II auxiliary switch.
In addition, the first return coil work indicating device 13 can be electrically connected with the temporary short-circuiting device 11 of the normally closed contact of the I-bus auxiliary switch; when the first return coil work indicating device 13 gives an early warning about poor or non-closed state of the normally-closed contact 42 of the I-bus auxiliary switch, a signal is sent to the temporary short-circuiting device 11 of the normally-closed contact of the I-bus auxiliary switch to temporarily short-circuit the two end points of the normally-closed contact 42 of the I-bus auxiliary switch. Similarly, the second return coil work indicating device 14 can be electrically connected with the temporary short-circuiting device 12 of the normally closed contact of the auxiliary switch II; when the second return coil work indicating device 14 gives an early warning about poor or non-closed state of the normally-closed contact 62 of the secondary II switch, a signal is sent to the temporary short-circuiting device 12 of the normally-closed contact of the secondary II switch to temporarily short-circuit the two end points of the normally-closed contact 62 of the secondary II switch.
As an alternative embodiment, the first return coil operation indicating means 13 in the embodiment shown in fig. 3 comprises a first return coil operation indicating lamp 131. The second return coil operation indicating means 14 includes a second return coil operation indicating lamp 141. By providing the return coil operation indicating device including the return coil operation indicating lamp, an operator can intuitively and clearly monitor the operation conditions of the I auxiliary switch normally-closed contact 42 and the II auxiliary switch normally-closed contact 62.
The dashed line box in fig. 3 includes a part of the structure, such as the I-bus two-position relay 5, the ii-bus two-position relay 7, and related contacts, which constitute the main body of the self-holding circuit for switching the secondary voltage of the double bus in the present application: and a secondary voltage switching device.
In addition, the I-master voltage indicator lamp 8, the II-master voltage indicator lamp 9, the secondary voltage switching simultaneous operation alarm indicator lamp 1021, the first return coil operation indicator lamp 131 and the second return coil operation indicator lamp 141 may be collectively and intensively displayed on the secondary voltage switching device panel, as shown in fig. 5, fig. 5 includes a secondary voltage switching indicator panel I and a secondary voltage switching indicator panel II, wherein the secondary voltage switching indicator panel I includes respective indicator lamps for indicating secondary protection measurement voltages, and the secondary voltage switching indicator panel II includes respective indicator lamps for indicating secondary metering voltages. And the fault detection device can also transmit the fault detection signal to a background monitoring display through communication, and an operator can judge whether the contact of the auxiliary switch of the isolating switch is closed or opened by checking and monitoring whether each indicator lamp on the secondary voltage switching device is on or not in time so as to timely treat the fault possibly occurring in the operation process of the self-holding circuit for switching the secondary voltage.
In addition, each embodiment of the present disclosure is described with reference to switching and self-holding of the secondary protection measurement voltage, and the secondary voltage switching and self-holding circuit provided in the present application may also be used to switch and self-hold the secondary measurement voltage, and when the secondary measurement voltage is switched or self-held, the secondary measurement voltage in fig. 3 will be directly connected to the electric energy meter installed on the high-voltage switch cabinet.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The above-described embodiments of the present application are not intended to limit the scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (9)
1. The utility model provides a self preservation circuit of two generating line secondary voltage switch which characterized in that includes:
a DC power supply (1);
the first power-on loop (2) and the second power-on loop (3) are respectively connected between the two ends of the positive electrode and the negative electrode of the direct-current power supply (1);
the auxiliary switch contact (4) of the I-shaped female isolation disconnecting link and the I-shaped female double-position relay (5) are sequentially connected in series with the first energizing circuit (2);
The auxiliary switch contact (6) of the II female isolation disconnecting link and the II female double-position relay (7) are sequentially connected in series with the second electrifying loop (3);
the first energizing circuit (2) comprises a first energizing electronic circuit (21) and a second energizing electronic circuit (22);
the auxiliary switch contact (4) of the I female isolation disconnecting link comprises a normally open contact (41) of the I female auxiliary switch and a normally closed contact (42) of the I female auxiliary switch;
the I-master double-position relay (5) comprises a first I-master normally-open contact (51), a first action coil (52), a first return coil (54), a first action coil normally-open contact (53) and a first return coil normally-closed contact (55), wherein the first I-master normally-open contact (51) and the first action coil normally-open contact (53) are synchronous switches;
the normally-closed contact (42), the normally-open contact (53) of the first action coil and the first return coil (54) of the I-master auxiliary switch are connected in series with the second communication electronic loop (22);
the second energizing circuit (3) comprises a third electronic circuit (31) and a fourth electronic circuit (32);
the auxiliary switch contact (6) of the II master isolating switch comprises a normally open contact (61) of the II master isolating switch and a normally closed contact (62) of the II master isolating switch;
The II master double-position relay (7) comprises a first II master normally-open contact (71), a second action coil (72), a second return coil (74), a second action coil normally-open contact (73) and a second return coil normally-closed contact (75), wherein the first II master normally-open contact (71) and the second action coil normally-open contact (73) are synchronous switches;
the normally-open contact (61), the normally-closed contact (75) of the second return coil and the second action coil (72) of the II master auxiliary switch are connected in series to the third electronic circuit (31), and the normally-closed contact (62), the normally-open contact (73) of the second action coil and the second return coil (74) of the II master auxiliary switch are connected in series to the fourth electronic circuit (32).
2. The self-holding circuit for double bus secondary voltage switching according to claim 1, further comprising:
an I master voltage indicator lamp (8) connected in series with the normally open contact (41) of the I master auxiliary switch and connected in parallel with the I master double-position relay (5); the method comprises the steps of,
and the II master voltage indicator lamp (9) is connected in series with the normally open contact (61) of the II master auxiliary switch and is connected in parallel with the II master double-position relay (7).
3. The self-holding circuit for double bus secondary voltage switching according to claim 1, wherein,
The I-master double-position relay (5) further comprises a second I-master normally-open contact (56), wherein the second I-master normally-open contact (56) and the first action coil normally-open contact (53) are synchronous switches;
the II master double-position relay (7) further comprises a second II master normally-open contact (76), wherein the second II master normally-open contact (76) and the second action coil normally-open contact (73) are synchronous switches;
the self-holding circuit further comprises a secondary voltage switching relay simultaneous action alarm circuit (10), and the secondary voltage switching relay simultaneous action alarm circuit (10) comprises:
a third three-way current loop (101) and a secondary voltage switching simultaneous action alarm device (102) which are connected to both ends of the positive electrode and the negative electrode of the direct current power supply (1);
the second I normally open contact (56), the second II normally open contact (76) and the secondary voltage switching simultaneous action alarm device (102) are connected in series to the third three-way electric loop (101).
4. The self-holding circuit for double bus secondary voltage switching as set forth in claim 3 wherein said secondary voltage switching simultaneous operation alarm means (102) comprises a secondary voltage switching simultaneous operation alarm indication lamp (1021).
5. The self-holding circuit for double bus secondary voltage switching as set forth in claim 3, further comprising:
the I-bus auxiliary switch normally-closed contact temporary short-circuit device (11) is electrically connected with the secondary voltage switching and simultaneous action alarm device (102); the method comprises the steps of,
a normally closed contact temporary short-circuiting device (12) of the auxiliary switch of the secondary II auxiliary switch which is electrically connected with the secondary voltage switching and simultaneously acts on the alarm device (102);
the device comprises a first auxiliary switch normally-closed contact temporary short-circuiting device (11), a second auxiliary switch normally-closed contact temporary short-circuiting device (12) and a third auxiliary switch normally-closed contact temporary short-circuiting device (62), wherein the first auxiliary switch normally-closed contact temporary short-circuiting device (11) is connected to two ends of a first auxiliary switch normally-closed contact (42), and the second auxiliary switch normally-closed contact temporary short-circuiting device (12) is connected to two ends of a second auxiliary switch normally-closed contact (62).
6. The self-holding circuit for double bus secondary voltage switching according to claim 5, further comprising:
a first return coil work indicating device (13) connected in series with the second communication electronic circuit (22); the method comprises the steps of,
and a second return coil work indicating device (14) connected in series with the fourth electronic circuit (32).
7. The self-holding circuit for double bus secondary voltage switching according to claim 6, wherein,
the normally closed contact temporary short-circuiting device (11) of the I-bus auxiliary switch is also electrically connected with the first resetting coil work indicating device (13);
And the normally closed contact temporary short-circuiting device (12) of the II-type auxiliary switch is also electrically connected with the second resetting coil work indicating device (14).
8. The self-holding circuit for double bus secondary voltage switching according to claim 6, wherein,
the first return coil work indicating device (13) comprises a first return coil work indicating lamp (131);
the second return coil operation indicating device (14) includes a second return coil operation indicating lamp (141).
9. A double bus secondary voltage switching circuit, comprising:
a self-holding circuit for switching the secondary voltage of the double bus bars according to any one of claims 1 to 8, wherein the secondary voltage bus bar (15) of the I-type voltage transformer, the secondary voltage bus bar (16) of the II-type voltage transformer, the secondary voltage air switch (17) of the high-voltage switch cabinet; wherein,,
the secondary voltage bus (15) of the I-type voltage transformer is electrically connected with the secondary voltage air switch (17) of the high-voltage switch cabinet through a first secondary electric loop (18);
the secondary voltage bus (16) of the secondary voltage transformer II is electrically connected with the secondary voltage air switch (17) of the high-voltage switch cabinet through a second secondary electric loop (19);
a first I female normally open contact (51) of an I female double-position relay (5) in the self-holding circuit is connected to the first secondary electric loop (18);
A first II female normally open contact (71) of the II female double-position relay (7) in the self-holding circuit is connected to the second secondary electric loop (19).
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| CN201710202304.XA CN106712017B (en) | 2017-03-30 | 2017-03-30 | Double-bus secondary voltage switching circuit and self-holding circuit thereof |
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| CN108152579B (en) * | 2018-02-02 | 2024-02-02 | 山东钢铁股份有限公司 | Secondary metering voltage parallel circuit of voltage transformer |
| CN108390379A (en) * | 2018-05-08 | 2018-08-10 | 河南森源电气股份有限公司 | A kind of device of sectionalized single busbar connection PT systems and anti-power transmission when preventing PT from overhauling |
| CN111917105B (en) * | 2020-07-07 | 2022-09-06 | 广东电网有限责任公司 | Circuit for preventing misoperation of bus voltage parallel circuit based on microcomputer five-prevention |
| CN114268170B (en) * | 2021-12-27 | 2023-10-20 | 深圳供电局有限公司 | Monitoring system and method for intelligent air switch circuit |
| CN115980438A (en) * | 2023-01-06 | 2023-04-18 | 国网河北省电力有限公司邯郸供电分公司 | Method and system for acquiring double-bus electric energy metering voltage of transformer substation |
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| CN106532656A (en) * | 2016-08-22 | 2017-03-22 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Double-bus line protection method and device of integrating voltage switching |
| CN106532904A (en) * | 2017-01-04 | 2017-03-22 | 山东钢铁股份有限公司 | Double bus-powered PT secondary voltage switching circuit and protection circuit thereof |
| CN206611180U (en) * | 2017-03-30 | 2017-11-03 | 山东钢铁股份有限公司 | Double-bus secondary voltage switching circuit and its self-hold circuit |
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