CN110632444A - Detection system and detection method of grounding disconnecting link - Google Patents
Detection system and detection method of grounding disconnecting link Download PDFInfo
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- CN110632444A CN110632444A CN201910995860.6A CN201910995860A CN110632444A CN 110632444 A CN110632444 A CN 110632444A CN 201910995860 A CN201910995860 A CN 201910995860A CN 110632444 A CN110632444 A CN 110632444A
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- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
A detection system and a detection method of a grounding disconnecting link comprise a V + detection power supply, a 24VDC power supply, a detection device and an acousto-optic alarm, wherein the detection device comprises a grounding connection detection device and a grounding disconnecting link detection device, one end of the grounding connection detection device is connected with the V + detection power supply through a detection switch K1, and the other end is divided into three paths which are respectively connected with a lower contact N1\ N3\ N5 of an A \ B \ C phase of the grounding disconnecting link; one end of the grounding disconnecting link detection device is connected with a V + detection power supply through a detection switch K2, and the other end is divided into three paths to be respectively connected with the upper contacts N2\ N4\ N6 of the A \ B \ C phase of the grounding disconnecting link; closing the detection switch K1 to detect the ground connection state, wherein the ground connection state is normal, and closing the detection switch K2 to detect the connection state of the grounding disconnecting link; when the connection state is abnormal, an audible and visual alarm is used for alarming. The invention can accurately detect the state of the disconnecting link and effectively prevent misoperation.
Description
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a detection system and a detection method of a grounding switch.
Background
The grounding knife switch is widely applied in the power industry and is a grounding measure for ensuring safety. If the grounding knife switch or grounding is in a problem, effective grounding protection cannot be realized, the grounding knife switch is a great potential safety hazard, personal and equipment safety is seriously threatened, and the detection and management of the grounding knife switch are enhanced particularly importantly. But at present, the anti-misoperation locking is mainly focused, and the grounding disconnecting link is not detected and managed.
Disclosure of Invention
Aiming at the existing technical problems, the detection system and the detection method of the grounding disconnecting link are provided, so that the grounding disconnecting link is detected and displayed, the condition of the grounding disconnecting link is ensured to be good, the switching-on is allowed, and the alarm is given in time when the problem occurs.
The purpose of the invention is realized by the following technical scheme:
a detection system of a grounding disconnecting link comprises a V + detection power supply, a 24VDC power supply, a detection device and an acousto-optic alarm, wherein the detection device comprises a grounding connection detection device and a grounding disconnecting link detection device,
one end of the grounding connection detection device is connected with a V + detection power supply through a detection switch K1, and the other end is divided into three paths and is respectively connected with the lower contact N1\ N3\ N5 of the grounding disconnecting link A \ B \ C phase;
one end of the grounding disconnecting link detection device is connected with a V + detection power supply through a detection switch K2, and the other end is divided into three paths and is respectively connected with the upper contacts N2\ N4\ N6 of the grounding disconnecting link A \ B \ C phase;
the other ends of the detection switches K1 and K2 are connected with a V + detection power supply in parallel, one end of the audible and visual alarm is connected with a +24VDC power supply, and the other end of the audible and visual alarm is connected with a-24 VDC power supply;
contacts KA12, KB12 and KC12 of relays KA1, KB1 and KC1 of the grounding connection detection device are sequentially connected in series, the end of a contact KC12 is connected with a-24 VDC power supply through a relay KJ1 coil, and a contact KA12 is connected with a +24VDC power supply;
contacts KA22, KB22 and KC22 of relays KA2, KB2 and KC2 of the grounding knife switch detection device are sequentially connected in series, the end of a contact KC22 is connected with a-24 VDC power supply through a relay KJ2 coil,
the contact KA22 is connected with a +24VDC power supply;
after the detection switch K1 is closed, detecting the grounding connection state, and after the grounding connection state is normal, detecting the connection state of the grounding disconnecting link after the detection switch K2 is closed; when the connection state is abnormal, an audible and visual alarm is used for alarming.
The invention has the beneficial effects that:
1. the invention can realize the detection and display of the grounding knife switch, and can allow the switch-on only when the grounding knife switch is in good state, thereby giving an alarm in time when a problem occurs.
2. According to the invention, the grounding connection detection device and the grounding disconnecting link detection device which are independent are respectively arranged, and the audible and visual alarm is connected in parallel, so that whether the grounding connection state of the grounding disconnecting link and the self-connection state of the grounding disconnecting link are normal can be respectively detected, the display circuit displays that a fault alarm occurs, the state of the disconnecting link can be effectively and accurately detected, and the equipment damage and the personal safety hidden danger caused by fault misoperation are prevented.
3. According to the grounding switch detection device, the bracket is connected to the main shaft of the grounding switch, the cable contact is connected to the bracket, the cable contact on the bracket is driven to be in transmission connection with the upper end of the grounding switch to detect when the main shaft of the grounding switch rotates, and the connection between the cable contact and the upper end of the grounding switch is disconnected when the grounding switch does not detect, so that the grounding switch detection device is convenient, quick and safe to operate.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
FIG. 2 is a schematic diagram of a ground connection detection apparatus according to the present invention.
FIG. 3 is a schematic view of a ground connection display device according to the present invention.
Fig. 4 is a schematic view of the grounding switch detection device of the present invention.
Fig. 5 is a schematic view of a connecting cable rotating device between the relay and the grounding switch in fig. 4.
FIG. 6 is a schematic diagram of a grounding switch display device according to the present invention.
FIG. 7 is a flow chart of the detection method of the present invention.
In the figure: 1. main shaft, 21/22/23 insulating block, 31/32/33 cable, 41/42/43 support, S1/S2/S3 contact.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example (b): as shown in fig. 1, the detection device of the grounding disconnecting link of the present invention comprises a V + detection power supply, a 24VDC power supply, a detection device, and an acousto-optic alarm, wherein the detection device comprises a grounding connection detection device and a grounding disconnecting link detection device, one end of the grounding connection detection device is connected to the V + detection power supply through a detection switch K1, and the other end is divided into three paths and respectively connected to a lower contact N1\ N3\ N5 of a phase a \ B \ C of the grounding disconnecting link; one end of the grounding disconnecting link detection device is connected with a V + detection power supply through a detection switch K2, and the other end is divided into three paths and is respectively connected with the upper contacts N2\ N4\ N6 of the grounding disconnecting link A \ B \ C phase; the other ends of the detection switches K1 and K2 are connected with a V + detection power supply in parallel, one end of the audible and visual alarm is connected with a +24VDC power supply, and the other end of the audible and visual alarm is connected with a-24 VDC power supply;
contacts KA22, KB22 and KC22 of relays KA2, KB2 and KC2 of the grounding knife switch detection device are sequentially connected in series, the end of a contact KC22 is connected with a-24 VDC power supply through a relay KJ2 coil,
the contact KA22 is connected with a +24VDC power supply;
after the detection switch K1 is closed, detecting the grounding connection state, and after the grounding connection state is normal, detecting the connection state of the grounding disconnecting link after the detection switch K2 is closed; when the connection state is abnormal, an audible and visual alarm is used for alarming.
As shown in fig. 2, the ground connection detection device comprises a detection switch K1, relays KA1, KB1 and KC1, wherein one ends of coils of the relays KA1, KB1 and KC1 are connected in parallel to one end of a detection switch K1, the other end of the detection switch K1 is connected with a power supply V +, and the other ends of coils of the relays KA1, KB1 and KC1 are respectively connected with lower end contacts N1, N3 and N5 of a grounding knife switch, and are connected with a ground wire through lower end contacts N1, N3 and N5 of the grounding knife switch; closing the detection switch K1 to detect the grounding connection state, and opening the detection switch K1 to not detect; wherein, the power supply V + can adopt a power supply of 24V-220V.
When the grounding switch is not closed, the grounding connection detection device closes the detection switch K1 to detect the state of grounding connection, and three-phase detection of grounding connection A, B, C is carried out through the lower end contacts N1, N3 and N5 of the grounding switch. When the detection switch K1 is turned off, detection is not performed.
As shown in fig. 3, the ground connection detection device is further connected with a ground connection display device, which comprises indicator lamps LA1, LB1 and LC1, one ends of the indicator lamps are respectively connected with contacts of relays KA1, KB1 and KC1, the rear ends of KA11, KB11 and KC11 are connected in parallel with a +24VDC power supply, and the other ends of the indicator lamps are connected in parallel with a-24 VDC power supply. When the grounding connection detection device detects that the grounding state of the grounding disconnecting link is good, the indicator lamp is on, and when the grounding state has a fault, the indicator lamp is not on.
The detection switch K1 in this example provides power detection for the ground connection detection means. After the detection is finished, the detection switch K1 can be selected to be closed all the time, and the state and display of the grounding connection can be detected in real time. Alternatively, the disconnection detection switch K1 may be selected so that the ground connection is no longer detected and displayed.
As shown in fig. 4, the earthing knife-switch detection device includes a detection switch K2, relays KA2, KB2 and KC2, one end of the coils of the relays KA2, KB2 and KC2 is connected in parallel to one end of a detection switch K2, the other end of the detection switch K2 is connected to a power supply V +, the other end of the detection switch K2 is connected to a detection power supply V +, when the earthing knife-switch is closed, the other ends of the coils of the relays KA2, KB2 and KC2 are respectively connected to a terminal S2 of the cable 31, a terminal S4 of the cable 32 and a terminal S6 of the cable 33, and when the earthing knife-switch is closed, the other ends of the coils of the relays KA2, KB2 and KC2 are respectively connected to upper end contacts N2, N4 and N6 of the earthing knife-switch along with the rotation of the support, and a ground wire is connected to a lower end contact N1, N3 and N36; the connection state of the earthing switch is detected by closing the detection switch K2, and the detection is not performed by opening the detection switch K2.
As shown in fig. 5, the other ends of the coils of the relays KA2, KB2, KC2 are connected to the upper end contacts N2, N4, N6 connected to the grounding switch through a rotating device, the rotating device is characterized in that three brackets are connected to the main shaft 1 of the grounding switch, the three brackets respectively correspond to the three-phase contacts of the grounding switch, each bracket 41/42/43 is connected to the other end terminals S1, S3, S5 of the cable 31/32/33 through an insulating block 21/22/23, when the grounding switch is closed, the main shaft 1 of the grounding switch is rotated to drive the bracket 41/42/43 to rotate simultaneously, so that the terminals S1, S3, S5 of the cable 31/32/33 are connected to the upper end three-phase contacts N2, N4, N6 of the grounding switch respectively, and after the detection switch K2 is closed, the three-phase detection of the grounding switch A, B, C is performed. When the detection switch K2 is turned off, detection is not performed.
In a normal working state, the upper end contact of the grounding disconnecting link is electrified, and the rotating device is designed to realize that the grounding disconnecting link is not connected when being disconnected and is connected only when being closed, so that the operation safety is ensured.
As shown in FIG. 6, a grounding disconnecting link display device is also connected, and comprises indicator lights LA2, LB2 and LC2, one ends of the indicator lights are respectively connected with contacts KA21, KB21 and KC21 of relays KA2, KB2 and KC2 and then connected with a +24VDC power supply in parallel, and the other ends of the indicator lights are connected with a-24 VDC power supply in parallel.
The detection switch K2 provides power supply detection for the grounding switch detection device. After the detection is finished, the detection switch K2 can be selected to be closed all the time, and the state and display of the grounding connection can be detected in real time. Alternatively, the disconnection detection switch K2 may be selected so that the ground connection is no longer detected and displayed.
The power supply of the embodiment is independent, the two detection devices are powered by a 24-220V power supply, and the display device and the audible and visual alarm circuit are powered by +24 VDC.
As shown in FIG. 1, in the detection device of this embodiment, when the grounding disconnecting link ABC is grounded normally in three phases, the relay KJ1\ KJ2 is powered on, the normally closed contact is disconnected, and the audible and visual alarm does not give an alarm. If the grounding knife switch ABC is abnormally grounded, an alarm signal is sent out in time.
The detection method of the detection system of the grounding knife switch is characterized in that: the method comprises the following steps:
(1) when the grounding disconnecting link is not closed, the grounding connection state of the grounding disconnecting link is detected through a grounding connection detection device;
(2) judging whether the grounding connection state in the step (1) is normal, if the grounding connection state is abnormal, alarming by an audible and visual alarm, and finishing detection; if the connection state is normal, entering the step (3);
(3) closing the grounding disconnecting link, and detecting the connection state of the grounding disconnecting link through a grounding disconnecting link detection device;
(4) judging whether the connection state of the grounding disconnecting link in the step (3) is normal, if the connection state is abnormal, alarming by an audible and visual alarm, and finishing detection; if the connection state of the grounding disconnecting link is normal, the detection is finished;
when the three-phase grounding of the grounding disconnecting link is normal, a relay KJ1 connected between the grounding connection detection device and the audible and visual alarm, a relay KJ2 connected between the grounding disconnecting link detection device and the audible and visual alarm are electrified, a normally closed contact of the relay is disconnected, and the audible and visual alarm does not give an alarm; on the contrary, when the grounding is abnormal, the relays KJ1 and KJ2 are not powered, and the audible and visual alarm gives an alarm.
The detection method of the grounding connection detection device in the embodiment is characterized in that in the state that a grounding disconnecting link is not closed, whether a relay KJ1 is electrified or not is judged by controlling the closing of a detection switch K1, the connection states of coils of relays KA1, KB1 and KC1 connected to three-phase lower end contacts N1, N3 and N5 of the grounding disconnecting link are detected, indicating lamps LA1, LB1 and LC1 connected to the relays KA1, KB1 and KC1 contact KA11, KB11 and KC11 are used for displaying, the coils of the relays KA1, KB1 and KC1 are electrified, indicating lamps LA1, LB1 and LC1 connected to the contacts KA11, KB11 and KC11 are lightened to indicate that the grounding connection is normal, the indicating lamps are not lightened to indicate that a fault exists, and an audible and visual alarm is used for alarming.
The detection method of the grounding disconnecting link detection device is characterized in that in the closing state of a grounding disconnecting link, whether a relay KJ2 is electrified or not is judged by controlling the closing of a detection switch K2, the connection states of coils of relays KA2, KB2 and KC2 connected to three-phase upper end contacts N2, N4 and N6 of the grounding disconnecting link are detected, indication lamps LA2, LB2 and LC2 connected to the relays KA2, KB2 and KC2 contacts KA21, KB21 and KC21 are used for displaying, the coils of the relays KA2, KB2 and KC2 are electrified, indication lamps LA2, LB2 and LC2 of the contacts KA21, KB21 and KC21 are lightened to indicate that the grounding connection is normal, the indication lamps are not lightened to indicate that the indication lamps are in fault, and an audible and visual alarm is used for giving an audible and visual alarm.
As shown in fig. 1 and 7, when the grounding knife switch is used, the grounding knife switch is in a non-closing state, then the detection switch K1 is closed to detect the grounding connection state, the indicator lamps LA1, LB1 and LC1 of the connection contacts KA11, KB11 and KC11 of the relays KA2, KB2 and KC2 are on to indicate that the grounding connection is normal, the indicator lamps are not on to indicate that a fault exists, and if the grounding connection display device indicates that the grounding connection is abnormal, the grounding knife switch is not operated through an audible and visual alarm; if the display is normal, the grounding knife switch is closed, the detection switch K2 is closed, whether the connection state of the grounding knife switch is normal is detected through the grounding knife switch detection device, the indicating lamps LA2, LB2 and LC2 of the contacts KA21, KB21 and KC21 of the coils of the relays KA2, KB2 and KC2 are lightened to indicate that the grounding connection is normal, the indicating lamps are not lightened to indicate that the fault exists, if the display of the grounding knife switch is abnormal, an audible and visual alarm is used for alarming, and if the display of the grounding knife switch is normal, the detection is finished.
Claims (9)
1. The utility model provides a detecting system of ground connection switch which characterized in that: comprises a V + detection power supply, a 24VDC power supply, a detection device and an acousto-optic alarm, wherein the detection device comprises a grounding connection detection device and a grounding disconnecting link detection device,
one end of the grounding connection detection device is connected with a V + detection power supply through a detection switch K1, and the other end is divided into three paths and is respectively connected with the lower contact N1\ N3\ N5 of the grounding disconnecting link A \ B \ C phase;
one end of the grounding disconnecting link detection device is connected with a V + detection power supply through a detection switch K2, and the other end is divided into three paths and is respectively connected with the upper contacts N2\ N4\ N6 of the grounding disconnecting link A \ B \ C phase;
the other ends of the detection switches K1 and K2 are connected with a V + detection power supply in parallel, one end of the audible and visual alarm is connected with a +24VDC power supply, and the other end of the audible and visual alarm is connected with a-24 VDC power supply;
contacts KA12, KB12 and KC12 of relays KA1, KB1 and KC1 of the grounding connection detection device are sequentially connected in series, the end of a contact KC12 is connected with a-24 VDC power supply through a relay KJ1 coil, and a contact KA12 is connected with a +24VDC power supply;
contacts KA22, KB22 and KC22 of relays KA2, KB2 and KC2 of the grounding knife switch detection device are sequentially connected in series, the end of a contact KC22 is connected with a-24 VDC power supply through a relay KJ2 coil,
the contact KA22 is connected with a +24VDC power supply;
after the detection switch K1 is closed, detecting the grounding connection state, and after the grounding connection state is normal, detecting the connection state of the grounding disconnecting link after the detection switch K2 is closed; when the connection state is abnormal, an audible and visual alarm is used for alarming.
2. The system for detecting the earthing switch according to claim 1, wherein: the grounding connection detection device comprises a detection switch K1, relays KA1, KB1 and KC1, wherein one ends of coils of the relays KA1, KB1 and KC1 are connected in parallel to one end of the detection switch K1, the other end of the detection switch K1 is connected with a power supply V +, the other ends of the coils of the relays KA1, KB1 and KC1 are respectively connected with lower end contacts N1, N3 and N5 of the grounding disconnecting link, and the lower end contacts N1, N3 and N5 of the grounding disconnecting link are connected with a ground wire; the ground connection state detection is performed by closing the detection switch K1, and the detection is not performed by opening the detection switch K1.
3. The system for detecting the earthing switch according to claim 2, wherein: the display device is also connected with a ground connection and comprises indicator lamps LA1, LB1 and LC1, one ends of the indicator lamps are respectively connected with contacts of relays KA1, KB1 and KC1, the backs of the indicators KA11, KB11 and KC11 are connected in parallel with a +24VDC power supply, and the other ends of the indicator lamps are connected in parallel with a-24 VDC power supply.
4. The system for detecting the earthing switch according to claim 1, wherein: the earthing knife-switch detection device comprises detection switches K2, relays KA2, KB2 and KC2, wherein one ends of coils of the relays KA2, KB2 and KC2 are connected in parallel to one end of a detection switch K2, the other end of a detection switch K2 is connected with a V + detection power supply, when the earthing knife-switch is closed, the other ends of the coils of the relays KA2, KB2 and KC2 are respectively connected with a terminal S2 of a cable (31), a terminal S4 of the cable (32) and a terminal S6 of the cable (33), a terminal S1 of the cable (31) at the other end, a terminal S3 of the cable (32) and a terminal S5 of the cable (33) are connected with upper-end contacts N2, N4 and N6 of the earthing knife-switch after the support rotates, and are connected with an earth wire through lower-end contacts N1, N3 and N5 of the earthing knife-switch; the connection state of the earthing switch is detected by closing the detection switch K2, and the detection is not performed by opening the detection switch K2.
5. The system for detecting the earthing switch according to claim 4, wherein: the earthing knife switch display device is also connected with the earthing knife switch display device and comprises indicator lamps LA2, LB2 and LC2, one ends of the indicator lamps are respectively connected with contacts KA21, KB21 and KC21 of relays KA2, KB2 and KC2 and then connected with a +24VDC power supply in parallel, and the other ends of the indicator lamps are connected with a-24 VDC power supply in parallel.
6. The system for detecting the earthing switch according to claim 4, wherein: the other ends of the coils of the relays KA2, KB2 and KC2 are connected with upper-end contacts N2, N4 and N6 connected with a grounding switch through a rotating device, the rotating device is characterized in that three supports are connected to a main shaft of the grounding switch and respectively correspond to three-phase contacts of the grounding switch, each support is connected with cable terminals S1, S3 and S5 through an insulating block, when the grounding switch is closed, the main shaft of the grounding switch is rotated to drive the supports to rotate, so that the cable terminals S1, S3 and S5 are respectively connected with the upper-end three-phase contacts N2, N4 and N6 of the grounding switch, and the detection switch K2 is closed to detect three phases of the grounding switch A, B, C.
7. The method for detecting a system for detecting an earthing switch according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
(1) when the grounding disconnecting link is not closed, the grounding connection state of the grounding disconnecting link is detected through a grounding connection detection device;
(2) judging whether the grounding connection state in the step (1) is normal, if the grounding connection state is abnormal, alarming by an audible and visual alarm, and finishing detection; if the connection state is normal, entering the step (3);
(3) closing the grounding disconnecting link, and detecting the connection state of the grounding disconnecting link through a grounding disconnecting link detection device;
(4) judging whether the connection state of the grounding disconnecting link in the step (3) is normal, if the connection state is abnormal, alarming by an audible and visual alarm, and finishing detection; if the connection state of the grounding disconnecting link is normal, the detection is finished;
when the three-phase grounding of the grounding disconnecting link is normal, a relay KJ1 connected between the grounding connection detection device and the audible and visual alarm, a relay KJ2 connected between the grounding disconnecting link detection device and the audible and visual alarm are electrified, a normally closed contact of the relay is disconnected, and the audible and visual alarm does not give an alarm; on the contrary, when the grounding is abnormal, the relays KJ1 and KJ2 are not powered, and the audible and visual alarm gives an alarm.
8. The method of claim 7, wherein the detecting system comprises: the detection method of the grounding connection detection device is characterized in that under the non-closed state of the grounding disconnecting link, whether the relay KJ1 is electrified or not is judged by controlling the closing of the detection switch K1, the connection states of coils of relays KA1, KB1 and KC1 connected to three-phase lower end contacts N1, N3 and N5 of the grounding disconnecting link are detected, and the indication states are displayed through indicator lamps LA1, LB1 and LC1 connected with the relays KA1, KB1 and KC1 contacts KA11, KB11 and KC11, and are alarmed by an audible and visual alarm.
9. The method of claim 7, wherein the detecting system comprises: the detection method of the grounding knife switch detection device is characterized in that under the closing state of the grounding knife switch, the connection state of coils of relays KA2, KB2 and KC2 connected to contacts N2, N4 and N6 at the upper end of three phases of the grounding knife switch is detected by controlling the closing of a detection switch K2 and judging whether the relay KJ2 is electrified, and the connection state is displayed by indicator lamps LA2, LB2 and LC2 connected to the contacts KA2, KB2 and KC2, KA21, KB21 and KC21, and is alarmed by an audible and visual alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910995860.6A CN110632444A (en) | 2019-10-18 | 2019-10-18 | Detection system and detection method of grounding disconnecting link |
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| CN201910995860.6A CN110632444A (en) | 2019-10-18 | 2019-10-18 | Detection system and detection method of grounding disconnecting link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112433118A (en) * | 2020-11-16 | 2021-03-02 | 国网山东省电力公司聊城供电公司 | 10kV medium-voltage power generation vehicle anti-misoperation simulation device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112433118A (en) * | 2020-11-16 | 2021-03-02 | 国网山东省电力公司聊城供电公司 | 10kV medium-voltage power generation vehicle anti-misoperation simulation device and method |
| CN112433118B (en) * | 2020-11-16 | 2022-07-01 | 国网山东省电力公司聊城供电公司 | Anti-misoperation simulation device and method for 10kV medium-voltage power generation vehicle |
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