CN215344079U - Improved auxiliary power rapid switching device - Google Patents
Improved auxiliary power rapid switching device Download PDFInfo
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- CN215344079U CN215344079U CN202120882976.1U CN202120882976U CN215344079U CN 215344079 U CN215344079 U CN 215344079U CN 202120882976 U CN202120882976 U CN 202120882976U CN 215344079 U CN215344079 U CN 215344079U
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Abstract
The utility model discloses an improved rapid switching device for service power, wherein a current monitoring relay is connected in a secondary circuit of the service power working current in a series mode to serve as a working current criterion, and the working current criterion is led to the outside of a terminal block of the rapid switching device through a cable to be locked and opened into a first channel; a voltage monitoring relay is connected to each three-phase circuit of the bus, normally closed contacts of the voltage monitoring relays are connected in series to form a three-phase simultaneous disconnection criterion, and the criterion is led to the outside of a terminal block of the quick switching device through a cable to be locked and opened into a second channel; after the two groups of contact connection wires are connected in series again, the two groups of contact connection wires are connected into a locking channel of the device external opening and closing device through an electric connection wire, and the switching control of a power supply circuit is completed under the control of the quick switching device. The utility model has the beneficial effects that: the device makes up the defects of the existing design, performs logic optimization, and avoids the condition that the device has misoperation under the condition of three-phase PT disconnection. And basically based on original equipment and channels, the cost is saved to the greatest extent, and the safety of the equipment is guaranteed.
Description
Technical Field
The utility model relates to the technical field of power supply line control, in particular to a device for optimizing and realizing logic of a rapid service power switching device.
Background
At present, the rapid switching device for the service power is an important device of a service power system of a power plant. The function of the service power switching is embodied as ensuring the successful switching, and avoiding the accidents of shutdown of the boiler caused by protection trip, important auxiliary machine trip and the like. After the 6KV cable of the water plant of the power plant at the sea in 2020 has a ground fault, the 6kV bus PT three-phase primary fuse is fused, the Jinzhi MFC2000-2 type plant power rapid switching device is started in a voltage loss mode, only the bus voltage is judged, and no current criterion exists. The PT disconnection criterion only triggers PT disconnection alarm and device locking when one phase or two phases are disconnected, and the simultaneous disconnection condition of three phases is not judged as PT disconnection, so that the false switching condition of the quick switching device of the 9B section of the #9 machine is finally caused.
SUMMERY OF THE UTILITY MODEL
The utility model is an improved auxiliary power rapid switching device designed for solving the technical problems, and the device is a scheme for preventing the misoperation of a three-phase PT disconnection device by realizing logic judgment through wiring by external newly-added criteria based on the logic optimization of the existing equipment and channels.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
an improved rapid switching device for service power is characterized in that a current monitoring relay is connected in a secondary circuit of service power working current in a series mode to serve as working current criterion, and the working current is led to the outside of a terminal block of the rapid switching device through a cable to be locked and opened into a first channel; a voltage monitoring relay is connected to each three-phase circuit of the bus, normally closed contacts of the voltage monitoring relays are connected in series to form a three-phase simultaneous disconnection criterion, and the criterion is led to the outside of a terminal block of the quick switching device through a cable to be locked and opened into a second channel; and after two groups of contact connecting wires of the first quick-switching device terminal row external locking open channel and the second quick-switching device terminal row external locking open channel are connected in series again in the quick-switching device, the two groups of contact connecting wires are connected into the device external opening device locking channel through an electric connecting wire, and the quick-switching device is used for controlling to complete switching control of a power supply circuit.
The improved rapid switching device for the service power is characterized in that a low-voltage relay is adopted as a voltage monitoring relay.
The improved auxiliary power rapid switching device is characterized in that an auxiliary power working current secondary circuit refers to any phase in a working current circuit in a 6KV working incoming line switch cabinet, and a normally open contact of a current monitoring relay is used as a working current criterion.
According to the improved rapid switching device for the station service, the three-phase circuit of the bus is respectively connected with one voltage monitoring relay, and the judgment of three-phase power loss or three-phase PT disconnection faults is realized by connecting the voltage monitoring relays in series in a bus PT cabinet.
The utility model has the beneficial effects that: the logic optimization and implementation scheme of the device makes up the defects of the original design of the Jinzhi MFC2000-2 type station service rapid switching device, and avoids the condition that the device has misoperation under the condition of three-phase PT disconnection. And basically based on original equipment and channels, the cost is saved to the greatest extent, and the safety of the equipment is guaranteed.
Drawings
FIG. 1 is a schematic diagram of the logic structure of the present invention;
fig. 2 is a schematic diagram of the field implementation principle of the utility model.
Detailed Description
The utility model is further illustrated with reference to the following figures and examples.
As shown in fig. 1, the improved fast switching device for service power of the present invention has a current monitoring relay 1 connected in series in a secondary circuit of service power working current as a working current criterion, and is led to the outside of a terminal block of the fast switching device through a cable to lock an open channel one 3; a voltage monitoring relay 2 is connected to each three-phase circuit of the bus, and normally closed contacts of the voltage monitoring relays 2 are connected in series to form a three-phase simultaneous disconnection criterion and are led to the outside of a terminal block of the quick-switching device through a cable to be locked and opened into a second channel 4; and after two groups of contact connecting wires of a first quick-switching device terminal row external locking open-in channel 3 and a second quick-switching device terminal row external locking open-in channel 4 are connected in series again in the quick-switching device, the two groups of contact connecting wires are connected into the device external locking open-in channel through an electric connecting wire, and the quick-switching device is used for controlling to complete switching control of a power supply circuit.
In the improved auxiliary power rapid switching device, the voltage monitoring relay 2 adopts a low-voltage relay.
The improved auxiliary power rapid switching device is characterized in that an auxiliary power working current secondary circuit refers to any phase in a working current circuit in a 6KV working incoming line switch cabinet, and a normally open contact of a current monitoring relay 1 is used as a working current criterion.
According to the improved rapid switching device for the station service, the three-phase circuit of the bus is respectively connected with one voltage monitoring relay 2, and the judgment of three-phase power loss or three-phase PT disconnection faults is realized by connecting the voltage monitoring relays 2 in series in a bus PT cabinet.
Yet another embodiment
The utility model relates to an improved auxiliary power quick switching device which comprises a Jinzhi MFC2000-2 type auxiliary power quick switching device, a current monitoring relay, a low-voltage relay, a plurality of electric connecting wires and two cables.
According to the improved auxiliary power rapid switching device, normally closed contacts K3 of three JY-38 type voltage monitoring relays are connected in series at a 6 kV-bus PT cabinet and then are connected onto a terminal block, and a discharging cable is led to the rapid switching device.
According to the improved auxiliary power rapid switching device, one phase is selected from a current loop of the working incoming line protection and is connected in series with a current monitoring relay to serve as a current criterion.
According to the improved auxiliary power rapid switching device, after a current relay contact on the rapid switching device is connected in series with a voltage monitoring criterion contact introduced into a bus PT cabinet, a device switching value input/output locking terminal X1:68 and a device switching value input/output locking terminal X1:80 are accessed.
The utility model improves the small reconstruction by self through improving the judgment logic externally under the condition of the existing equipment. The current threshold value in 6KV protection is referred to be worth of conception, current monitoring criteria are added, the judgment of the operation condition when the three-phase PT is broken is perfected, simple logic combination is carried out, and the state of a bus is judged by using two sets of current and voltage, so that the device can correctly judge whether the real power loss occurs when the PT fuse three-phase is fused, the misoperation of the device is prevented, and the reliability of an equipment system is ensured.
In conclusion, the utility model is used for the power plant using the Jinzhi MFC2000-2 type station service power rapid switching device, and optimizes the logic design defect of the power plant through external logic realization, thereby preventing equipment misoperation. After transformation, on the basis of not influencing the realization of the original function, the judgment of special conditions is optimized, the recognition capability of the device on abnormal states is greatly improved, the possibility of misoperation of the device is reduced, and the safety of station service is ensured to the greatest extent.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products similar or identical to the present invention, which can be obtained by anyone based on the teaching of the present invention, fall within the protection scope of the present invention.
Claims (4)
1. The utility model provides a modified auxiliary power quick switching control equipment which characterized in that: a current monitoring relay (1) is connected in series in an auxiliary power working current secondary circuit to serve as a working current criterion, and the working current criterion is led to the outside of a terminal block of the quick switching device through a cable to be locked and opened into a first channel (3); a voltage monitoring relay (2) is connected to each three-phase circuit of the bus, and normally closed contacts of the voltage monitoring relays (2) are connected in series to form a three-phase simultaneous disconnection criterion and are led to the outside of a terminal block of the quick switching device through a cable to be locked and opened into a second channel (4); two groups of contact connecting wires of a first external locking open channel (3) of the terminal block of the quick switching device and a second external locking open channel (4) of the terminal block of the quick switching device are connected in series again in the quick switching device, and then are connected into the locking channel of the external locking open channel of the device through an electric connecting wire, and the quick switching device controls and completes switching control of a power supply circuit.
2. The improved auxiliary power rapid switching device of claim 1, wherein: the voltage monitoring relay (2) adopts a low-voltage relay.
3. The improved auxiliary power rapid switching device of claim 1, wherein: the auxiliary power working current secondary circuit refers to any phase in a working current circuit in a 6KV working incoming line switch cabinet, and the current monitoring relay (1) takes a normally open contact as a working current criterion.
4. The improved auxiliary power rapid switching device of claim 1, wherein: the three-phase circuit of the bus is respectively connected with a voltage monitoring relay (2), and the judgment of three-phase power loss or three-phase PT disconnection fault is realized by connecting the voltage monitoring relays (2) in series in a bus PT cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120882976.1U CN215344079U (en) | 2021-04-27 | 2021-04-27 | Improved auxiliary power rapid switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120882976.1U CN215344079U (en) | 2021-04-27 | 2021-04-27 | Improved auxiliary power rapid switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215344079U true CN215344079U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120882976.1U Active CN215344079U (en) | 2021-04-27 | 2021-04-27 | Improved auxiliary power rapid switching device |
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| CN (1) | CN215344079U (en) |
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2021
- 2021-04-27 CN CN202120882976.1U patent/CN215344079U/en active Active
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