CN210863997U - Fault detection device for primary and secondary loops of ring network unit - Google Patents
Fault detection device for primary and secondary loops of ring network unit Download PDFInfo
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- CN210863997U CN210863997U CN201921461503.3U CN201921461503U CN210863997U CN 210863997 U CN210863997 U CN 210863997U CN 201921461503 U CN201921461503 U CN 201921461503U CN 210863997 U CN210863997 U CN 210863997U
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Abstract
The utility model relates to a looped netowrk unit secondary circuit fault detection device, its characterized in that is including setting up on the looped netowrk box by the plug-in wiring terminal seat that 11 at least terminals constitute, with terminal seat matched with work plug and test plug, and every terminal of terminal seat comprises the upper and lower both ends that can connect or break off, and test plug corresponds with it and also comprises the upper and lower both ends that can connect or break off. The utility model solves the main technical problems of realizing the isolation and detection of a secondary loop in a ring network unit system, ensuring the isolation and detection of the secondary loop under the condition of no power failure during fault detection, and judging the position of the fault on the spot; the method has strong universality and is suitable for primary and secondary fusion systems of all ring network units.
Description
Technical Field
The utility model belongs to the technical field of electric circuit fault detection, especially a looped netowrk unit secondary circuit fault detection device.
Background
At present, the fusion of primary and secondary equipment of an indoor 10KV switching station and an outdoor 10KV ring network box in a ring network power supply system is realized, and the 'three-remote' control of remote control, remote measurement and remote signaling is realized by a 10KV ring network switch cabinet and a distribution network automatic terminal (DTU). Because a secondary three-remote system is added in a primary power distribution system, in actual operation and maintenance, if the system fails, firstly, whether the system is a primary circuit fault or a secondary circuit fault must be judged, and then, a maintainer must be dispatched to a fault site. And as the detection and maintenance of the primary and secondary circuits relate to different specialties such as strong electricity and weak points, the problem of assigning detection and maintenance personnel of which specialties is difficult is solved. In reality, a primary device detection maintenance worker usually confirms that a primary loop has no fault after the primary device detection maintenance worker arrives at the site for detection, and a secondary device detection maintenance worker has to be dispatched to go to the site again, so that the efficiency of maintenance work is greatly influenced. In addition, the maintenance needs to be carried out in a power failure mode, if the judgment of the fault of the primary circuit and the secondary circuit cannot be solved at one time, the power failure frequency needs to be increased, and therefore the stability of power supply is affected.
Disclosure of Invention
In order to solve the problem, the utility model provides a can once differentiate looped netowrk unit secondary circuit fault detection device of secondary circuit fault under the circumstances of not having a power failure.
The purpose of the utility model is realized like this: the utility model provides a looped netowrk unit secondary circuit fault detection device, its characterized in that is including setting up on the looped netowrk case by the plug-in wiring terminal seat that 11 at least terminals constitute, with terminal seat matched with work plug and test plug, and every terminal of terminal seat comprises the upper and lower both ends that can connect or break off, and test plug corresponds also by the upper and lower both ends that can connect or break off with it and constitutes, and the connected mode of terminal seat and looped netowrk case equipment is:
A. the lower ends of terminals No. 1, 2, 3 and 4 of the terminal base are connected to a secondary winding of the current transformer, and the upper ends of the terminals are connected to a DTU through an indoor current wiring terminal of the instrument to form a secondary current loop;
B. the lower end of a No. 5 terminal of the terminal seat is connected to the DTU remote switching outlet, and the upper end of the terminal is connected in parallel to a circuit breaker switching-on loop so as to form a remote control switching-on loop;
C. the lower end of a No. 6 terminal of the test terminal base is connected to one end of a KA1 relay coil, the other end of the relay coil is connected with a power supply zero line, and the upper end of the terminal is suspended to form a detection circuit;
D. the lower end of a No. 7 terminal of the terminal base is connected to a DTU remote opening outlet, and the upper end of the terminal is connected in parallel to a breaker opening loop to form a remote control opening loop;
E. the lower end of a No. 8 terminal of the terminal base is connected to one end of a KA2 relay coil, the other end of the relay coil is connected with a power supply zero line, and the upper end of the terminal is suspended to form a detection loop;
F. the lower end of the No. 9 terminal of the terminal seat is connected to the DTU remote-joint outlet loop in parallel, and the upper end of the terminal is suspended to form a detection loop;
G. the lower end of a No. 10 terminal of the terminal seat is connected to one end of the auxiliary contacts of the KA1 and KA2 relays, the other ends of the auxiliary contacts of the KA1 and KA2 relays are respectively connected to one end of the corresponding coils of the KA1 and KA2 relays, and the upper ends of the terminals are suspended to form a detection loop;
H. the lower end of the No. 11 terminal of the terminal base is connected to one end of the auxiliary contact of the KA2 relay, and the upper end of the terminal is connected to the other end of the auxiliary contact of the KA2 relay, so that a standby detection loop is formed;
I. the coil loops of the relays KA1 and KA2 are respectively connected with an indicator lamp in parallel, and the indicator lamp is connected between the lower end of the No. 10 terminal of the terminal base and the power supply zero line in series.
And the lower ends of the No. 1 to No. 10 terminals of the terminal base are respectively provided with a short-circuit ring.
The test plug is provided with short-circuit rings at the lower ends of No. 1 to No. 10 terminals corresponding to the terminals of the terminal base.
The test plug is provided with binding posts at the upper end and the lower end of each terminal.
The upper ends of terminals 1, 2, 3 and 4 of the terminal block are respectively provided with an aviation plug through the connecting section of the current wiring terminal and the DTU in the instrument room.
The utility model provides a main technical problem realize the isolation and the detection in the secondary circuit among the looped netowrk unit system, its advantage lies in: based on the unique structures of the test terminal base and the test plug and the circuit design matched with the test terminal base and the test plug, the isolation of a secondary loop and the detection of the running state can be realized under the condition of no power failure during fault detection, and the position of the fault is judged on the spot; the method has strong universality and is suitable for primary and secondary fusion systems of all ring network units.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a sectional view of the terminal block according to the present invention;
fig. 3 is a circuit diagram of the working plug insertion state of the terminal block of the present invention;
FIG. 4 is a drawing of the terminal block of the present invention;
FIG. 5 is a circuit diagram of the state of FIG. 4;
fig. 6 is a plug insertion state diagram of the terminal block test of the present invention;
FIG. 7 is a circuit diagram of the state of FIG. 6;
fig. 8 is a sectional view of the internal structure of the test plug of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings:
as shown in fig. 1, the test terminal block provided on the ring main cabinet door of the present embodiment has 11 terminals, and each terminal is composed of an upper end and a lower end which can be connected or separated.
No. 1, 2, 3, 4 terminal lower extreme of terminal seat are connected with current transformer secondary winding, and the terminal upper end is connected to the DTU through instrument room current binding post and aviation plug. Therefore, a secondary current loop is formed, wherein the No. 1, 2, 3 and 4 terminals play a role of conducting and providing an interface for external detection equipment, the current terminal in the instrument room plays a role of conducting, and the secondary winding of the current transformer converts the primary current value into a secondary current value. The DTU current acquisition unit is a measurement unit and provides data for DTU protection logic operation.
The lower end of the No. 5 terminal of the terminal seat is connected to the DTU remote-closing outlet, and the upper end of the terminal is connected in parallel to a circuit breaker closing loop. The connection forms a remote control closing loop, and plays a role in conducting and isolating the remote control closing loop.
The lower end of a No. 6 terminal of the terminal base is connected to one end of a KA1 relay coil, the other end of the relay coil is connected with a power supply zero line, and the upper end of the terminal is suspended. The connection forms a detection circuit, and after the closing loop is isolated, the conduction condition of the DTU remote control closing loop is detected.
The lower end of a No. 7 terminal of the terminal base is connected to a DTU remote switch-off outlet, and the upper end of the terminal is connected in parallel to a breaker switch-off loop. The connection forms a remote control brake separating loop, and plays a role in conducting and isolating the remote control brake separating loop.
The lower end of a No. 8 terminal of the terminal base is connected to one end of a KA2 relay coil, the other end of the relay coil is connected with a power supply zero line, and the upper end of the terminal is suspended. The connection forms a detection circuit, and after the closing loop is isolated, the conduction condition of the DTU remote control closing loop is detected.
The lower end of the No. 9 terminal of the terminal seat is connected to the DTU remote-closing outlet loop in parallel, and the upper end of the terminal is suspended. The connection forms a detection circuit, and after the opening loop is isolated, the conduction condition of the DTU remote control opening loop is detected.
The lower end of the No. 10 terminal of the terminal seat is connected to one end of the auxiliary contacts (normally open points) of the KA1 and KA2 relays, the other end of the auxiliary contacts of the KA1 and KA2 relays is connected to one end of the corresponding coils of the KA1 and KA2 relays respectively, and the upper end of the terminal is suspended. The connection and a circuit formed by No. 8 and No. 9 terminals jointly realize the detection of the conduction condition of a DTU remote control closing loop and a disconnecting loop.
The lower end of the No. 11 terminal of the terminal base is connected to one end of the auxiliary contact of the KA2 relay, and the upper end of the terminal is connected to the other end of the auxiliary contact of the KA2 relay. This connection constitutes a backup detection loop providing a backup protection trip backup time detection point.
The lower ends of terminals 1 to 10 of the terminal base are all provided with short-circuit rings.
Fig. 2 shows the structure of the terminal block when the working plug and the test plug are not inserted, and the upper and lower ends of the terminal are normally open. The lower end of the terminal is provided with a shorting ring 1. The upper and lower ends of the terminal are respectively provided with a wiring point 2 and a wiring point 3 which are connected with corresponding circuits.
As shown in fig. 1 and 3, in daily operation, a working plug is inserted into a terminal base, a conductor on the plug enables the upper end and the lower end of the terminal to be conducted, a short-circuit ring 1 at the lower end of the terminal is invalid, KA1, a KA2 relay, HR1, HR2 and HG indicating lamps do not work, a test loop is separated from a control loop, and a primary loop and a secondary loop are in normal working states.
As shown in fig. 2, 4 and 5, when the working plug is pulled out, the upper end and the lower end of the terminal base are disconnected, the short-circuit ring 1 at the lower end of the terminal takes effect, wherein the lower ends of the No. 1, 2, 3 and 4 terminals are in short circuit, and the protection current loop is sealed; 5. The lower end of the No. 6 terminal is in short circuit, and a remote control closing loop is switched to a KA1 coil by a closing coil of a circuit breaker; 7. The lower end of the No. 8 terminal is in short circuit, and a remote control tripping loop is switched to a KA2 coil by a tripping coil of a circuit breaker; 9. The lower end of the No. 10 terminal is in short circuit, and the remote control switching-on and switching-off power supply indicates.
As shown in fig. 6 and 7, when the fault detection is required, the terminal block working plug is pulled out, and the test plug is inserted. At this time, the upper and lower ends of the terminal base are disconnected, and the short circuit ring at the lower end of the terminal is invalid. The short-circuit ring at the lower end of the test plug takes effect, so that the lower ends of No. 1, No. 2, No. 3 and No. 4 terminals are in short circuit, and a protection current loop is sealed; applying an overcurrent signal to the DTU at the upper end of the test plug; the lower ends of No. 7 and No. 8 terminals of the test plug are in short circuit, and a remote control tripping loop is switched to a KA2 coil by a tripping coil of the circuit breaker; receiving an overcurrent signal at the DTU, sending an overcurrent remote control tripping signal, and actuating an intermediate relay KA 2; the passive open point of the intermediate relay KA2 is closed, and the opening of the intermediate relay KA2 can be measured through testing that the No. 11 terminal of the plug is connected up and down.
As shown in fig. 8, the test plug is provided with terminals composed of upper and lower ends corresponding to the terminal block, and the upper end and the lower end of each terminal are provided with terminals 4 for connecting with the detection device. The terminals are provided with shorting rings 5.
After the test is finished, the work change-over switch is driven to the local position to reset, then the trip time can be tested again when the work change-over switch is driven to a remote position, the self-locking and experiment loop can be released when the test plug is pulled out and then the work plug is inserted, and the normal working state is recovered.
Under the condition that the system normally operates, the background can monitor the current value of the current system in real time, and when operation and maintenance personnel send out that the three-phase current values of the power grid are unbalanced, primary equipment (such as a current transformer) may have problems, and secondary ammeter or a detection system may have problems. At the moment, the working plug of the test terminal base can be pulled out, the short-circuit ring at the lower end of the terminal at the upper end of the terminal block takes effect, the secondary current loop is in short circuit, and the current transformer secondary loop is prevented from being opened to generate overvoltage. The test plug is then inserted into the test terminal block. At this moment, the short-circuit ring at the lower end of the terminal of the test terminal base is invalid, and the short-circuit ring on the test plug takes effect instead of the short-circuit ring, so that the short-circuit ring of the cabinet door test terminal base is functionally replaced. Meanwhile, the upper end and the lower end of the terminal of the test terminal base are disconnected, so that the test terminal base is separated from the measuring device of the system. At the moment, the wiring terminal B of the test plug is connected with the detection equipment, and then the short-circuit ring on the test plug is correspondingly taken down, so that the effect of detecting the current value of the system is realized. If the three-phase current is balanced and the numerical value reaches the standard, the primary equipment is proved to have no problem, and the problem is found on secondary measurement equipment on the system.
Example (b): when the circuit breaker can not realize remote closing, the closing signal of the DTU is not given, and the closing coil of the circuit breaker can be damaged. The working plug of the test terminal seat on the cabinet door can be pulled out at the moment, the short circuit ring of the test terminal seat works at the moment, the DTU closing outlet loop is separated from the closing loop of the circuit breaker, meanwhile, the detection loop is communicated with the DTU closing loop, the DTU is operated at the moment, the DTU closing outlet acts, if the red light HR1 is bright, the DTU closing outlet loop is proved to have no problem, and the problem appears on the circuit breaker closing coil.
Claims (5)
1. The utility model provides a looped netowrk unit secondary circuit fault detection device, its characterized in that is including setting up on the looped netowrk case by the plug-in wiring terminal seat that 11 at least terminals constitute, with terminal seat matched with work plug and test plug, and every terminal of terminal seat comprises the upper and lower both ends that can connect or break off, and test plug corresponds also by the upper and lower both ends that can connect or break off with it and constitutes, and the connected mode of terminal seat and looped netowrk case equipment is:
A. the lower ends of terminals No. 1, 2, 3 and 4 of the terminal base are connected to a secondary winding of the current transformer, and the upper ends of the terminals are connected to a DTU through an indoor current wiring terminal of the instrument to form a secondary current loop;
B. the lower end of a No. 5 terminal of the terminal seat is connected to the DTU remote switching outlet, and the upper end of the terminal is connected in parallel to a circuit breaker switching-on loop so as to form a remote control switching-on loop;
C. the lower end of a No. 6 terminal of the test terminal base is connected to one end of a KA1 relay coil, the other end of the relay coil is connected with a power supply zero line, and the upper end of the terminal is suspended to form a detection circuit;
D. the lower end of a No. 7 terminal of the terminal base is connected to a DTU remote opening outlet, and the upper end of the terminal is connected in parallel to a breaker opening loop to form a remote control opening loop;
E. the lower end of a No. 8 terminal of the terminal base is connected to one end of a KA2 relay coil, the other end of the relay coil is connected with a power supply zero line, and the upper end of the terminal is suspended to form a detection loop;
F. the lower end of the No. 9 terminal of the terminal seat is connected to the DTU remote-joint outlet loop in parallel, and the upper end of the terminal is suspended to form a detection loop;
G. the lower end of a No. 10 terminal of the terminal seat is connected to one end of the auxiliary contacts of the KA1 and KA2 relays, the other ends of the auxiliary contacts of the KA1 and KA2 relays are respectively connected to one end of the corresponding coils of the KA1 and KA2 relays, and the upper ends of the terminals are suspended to form a detection loop;
H. the lower end of the No. 11 terminal of the terminal base is connected to one end of the auxiliary contact of the KA2 relay, and the upper end of the terminal is connected to the other end of the auxiliary contact of the KA2 relay, so that a standby detection loop is formed;
I. the coil loops of the relays KA1 and KA2 are respectively connected with an indicator lamp in parallel, and the indicator lamp is connected between the lower end of the No. 10 terminal of the terminal base and the power supply zero line in series.
2. The primary and secondary loop fault detection device of claim 1, wherein the terminal base is provided with a short-circuit ring at the lower end of each of terminals No. 1 to No. 10.
3. The primary and secondary loop fault detection device of claim 1, wherein the test plug is provided with a short-circuit ring at the lower end of the No. 1 to No. 10 terminal corresponding to each terminal of the terminal base.
4. The apparatus of claim 1, wherein the test plug has terminals at both the upper and lower ends of each terminal.
5. The primary and secondary loop fault detection device of a ring network unit as claimed in claim 1, wherein the upper ends of terminals 1, 2, 3 and 4 of the terminal base are respectively provided with an aviation plug through the connection section of the current terminal and the DTU in the instrument room.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921461503.3U CN210863997U (en) | 2019-09-04 | 2019-09-04 | Fault detection device for primary and secondary loops of ring network unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921461503.3U CN210863997U (en) | 2019-09-04 | 2019-09-04 | Fault detection device for primary and secondary loops of ring network unit |
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| CN210863997U true CN210863997U (en) | 2020-06-26 |
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| CN201921461503.3U Active CN210863997U (en) | 2019-09-04 | 2019-09-04 | Fault detection device for primary and secondary loops of ring network unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115327284A (en) * | 2022-10-13 | 2022-11-11 | 江苏大烨智能电气股份有限公司 | Standardized looped network box multifunctional test tool and use method thereof |
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2019
- 2019-09-04 CN CN201921461503.3U patent/CN210863997U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115327284A (en) * | 2022-10-13 | 2022-11-11 | 江苏大烨智能电气股份有限公司 | Standardized looped network box multifunctional test tool and use method thereof |
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