CN217587356U - Uninterrupted replacing device with CT open circuit and automatic short circuit functions for electric energy meter - Google Patents
Uninterrupted replacing device with CT open circuit and automatic short circuit functions for electric energy meter Download PDFInfo
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- CN217587356U CN217587356U CN202221096000.2U CN202221096000U CN217587356U CN 217587356 U CN217587356 U CN 217587356U CN 202221096000 U CN202221096000 U CN 202221096000U CN 217587356 U CN217587356 U CN 217587356U
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
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Abstract
The utility model discloses a take CT to open a way electric energy meter of automatic short circuit function and change device not have a power failure relates to power equipment technical field. When the electric energy meter is replaced without power outage, the safety risk of replacing the meter without power outage exists. The utility model comprises a replacing instrument, a junction box and a cable, wherein the replacing instrument is connected with the junction box through the cable; the junction box is provided with a wiring terminal; the replacing instrument comprises an insulating shell, a first meter position thimble, a second meter position thimble, a first switch, a second switch, a first automatic short-circuiting device and a second automatic short-circuiting device; the first meter changing loop and the second meter changing loop are connected in parallel; the first automatic short circuiter is connected with the first meter changing loop; the second automatic short circuiter is connected with the second meter changing loop; the first automatic short-circuiting device and the second automatic short-circuiting device are both provided with a normally open switch K1, and two ends of the normally open switch K1 are electrically connected with two thimble leads of the same current transformer connected with the electric energy meter. The technical scheme is additionally provided with the automatic short circuiter, so that the working safety is effectively improved.
Description
Technical Field
The utility model relates to a power equipment technical field especially relates to a take CT to open a way electric energy meter of automatic short circuit function and change device without power failure.
Background
In order to guarantee the accuracy of electric energy metering, the national technical supervision administration has strict cycle alternation regulations on the electric energy meter which is forcibly verified. When the high-voltage user electric energy meter is rotated, safe meter replacement under the condition that the user side does not have power failure is required to be realized, when the electric energy meter is replaced without power failure, the CT open circuit condition may occur, and the safe risk of meter replacement without power failure exists.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that solve and the technical task that provides are perfect and improve prior art scheme, provide a take CT to open a way the electric energy meter of automatic short circuit function and change the device without power failure to when guaranteeing the continuity and the accuracy of measurement, avoid CT to open a way the risk, guarantee the purpose of the security of not having a power failure to change the table. Therefore, the utility model adopts the following technical scheme.
A device with CT open circuit and automatic short circuit functions for replacing an electric energy meter without power failure comprises a replacing instrument, a junction box and a cable, wherein the replacing instrument is connected with the junction box through the cable; the junction box is provided with a wiring terminal to connect the incoming line of the original meter position of the electric energy meter, so that the replacing instrument can be connected with the electric energy meter on the original meter position in parallel; the replacing instrument comprises an insulating shell, a first meter position thimble, a second meter position thimble, a first switch and a second switch, wherein the first meter position thimble, the second meter position thimble, the first switch and the second switch are positioned on the insulating shell; the first meter changing loop and the second meter changing loop are connected in parallel; the replacing instrument further comprises a first automatic short-circuiting device and a second automatic short-circuiting device, wherein the first automatic short-circuiting device is connected with the first meter replacing loop; the second automatic short circuiter is connected with the second meter changing loop; the first automatic short-circuiting device and the second automatic short-circuiting device are both provided with a normally open switch K1, two ends of the normally open switch K1 are electrically connected with two thimble leads of the same current transformer connected with the electric energy meter, and when the current exceeds the limit, the normally open switch K1 is closed, so that a secondary circuit of the current transformer is in short circuit.
When the meter replacing device is used, firstly, a cable is connected with the replacing instrument and the junction box, the new meter is fixed on the first meter position thimble in a plugging manner, the corresponding first switch is opened, the meter to be replaced in the original meter position is taken down from the metering cabinet, the new meter is fixed on the second meter position thimble in the plugging manner, the second switch is opened, the first switch is closed, the new meter is taken down and installed in the original meter position of the metering cabinet, the second switch is closed, the meter to be replaced is taken down, the connection between the replacing instrument and the junction box is disconnected, the alternate installation is completed through the replacement device without power outage, the continuous metering is realized, and the electric quantity during the meter replacing period is completely compensated and recorded in the new meter to be replaced. The automatic short circuiter can be at the in-process of changing, and when the current transformer secondary circuit appears opening a way and the overvoltage that produces, the action of automatic short circuiter, normally open switch K1 is closed, and the short circuit of current transformer secondary circuit, the overvoltage that opens a way disappears, effectively avoids the emergence of electric shock accident. The original meter position is used for installing an old electric energy meter before replacement and a new electric energy meter after replacement.
As a preferable technical means: the first automatic short-circuiting device and the second automatic short-circuiting device both comprise bistable power relays J, and the actions of normally-open switches K1 are controlled through the bistable power relays J, wherein the bistable power relays J are provided with action coils DZ and reset coils FW. The automatic short-circuiting device has the reset function, is flexible to use and is simple to operate.
As a preferable technical means: the first automatic short-circuiting device and the second automatic short-circuiting device respectively comprise a diode for monitoring overvoltage generated by the open circuit of the current transformer. Simple structure and reliable operation.
As a preferable technical means: the first automatic short circuiter and the second automatic short circuiter respectively comprise a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a trigger, an energy storage element C1 and a relay J, wherein the anode of the first diode D1 and the cathode of the third diode D3 are connected with one input end of a secondary circuit of the current transformer, the anode of the fourth diode D4 and the cathode of the second diode D2 are connected with the other input end of the secondary circuit of the current transformer, and the cathode of the first diode D1 and the cathode of the fourth diode D4 are connected with one end of the energy storage element C1; the anode of the third diode D3 and the anode of the second diode D2 are connected with the other end of the energy storage element C1; the energy storage element C1 is connected with a trigger J in parallel, and the trigger J is connected with a coil of the relay J to control the normally open switch K1 in the relay J. The working is stable, the reliability is good, and the safety of meter replacement without power failure is ensured.
As a preferable technical means: the relay J is a bistable power relay J, and an action coil DZ and a reset coil FW are arranged on the relay J; the replacing instrument is provided with a first reset switch for controlling the reset coil FW in the first automatic short-circuiting device to lose power and a second reset switch for controlling the reset coil FW in the second automatic short-circuiting device to lose power so as to apply a manual reset signal. The action coil DZ and the reset coil FW are positioned in a relay J, so that the automatic and manual functions are realized, and the use is flexible.
As a preferable technical means: the replacing instrument further comprises six display screens arranged side by side, the display screens are connected with the cable, and the display screens are used for displaying the metering data of the electric energy meter on the first replacing meter position and the second replacing meter position. The real-time observation can be realized, and the operation correctness is improved.
As a preferable technical means: one surface of the replacing instrument is a control panel, a plug-in connector matched with a cable is arranged at the upper left corner of the control panel, the control panel below the plug-in connector is divided into a left area and a right area which are respectively a first epitope control area and a second epitope control area, and first epitope thimbles and second epitope thimbles are correspondingly arranged in the first epitope control area and the second epitope control area in parallel; a display screen arranged side by side is arranged below the first and second epitope thimbles; the first and the second switches and the first and the second reset switches are correspondingly arranged below the display screen. The operation is clear at a glance and is more convenient and fast, and the error is avoided.
Has the advantages that:
1. this technical scheme adds the automatic short circuiter, effectively improves the security of work, and when the current transformer secondary circuit appears opening a way and the overvoltage that produces, the action of automatic short circuiter, normally open switch K1 is closed, and the current transformer secondary circuit short circuit, the overvoltage that opens a way disappears, effectively avoids the emergence of electric shock accident.
2. The replacing instrument is used as an intermediary in the meter replacing process, all electric quantity in the meter replacing process can be recorded in the electric energy meter through alternative installation, the work is reliable, and the operation is convenient.
3. The automatic short-circuiting device is provided with the diode, the characteristic that the diode absorbs current only when the voltage exceeds the threshold voltage is utilized, and the voltage of a secondary loop of the current transformer is very low when the meter changing process is normal, so that the automatic short-circuiting device is prevented from misoperation. When the secondary circuit of the current transformer is in an open circuit and overvoltage is generated, the diode is conducted, the energy storage element C1 immediately stores energy, the trigger releases energy of the energy storage element C1, the bistable power relay J in the automatic short-circuit device receives trigger energy, the action coil DZ responds to action, the normally open contact is immediately closed, the secondary circuit of the current transformer is in a short circuit, the open circuit overvoltage disappears, and electric shock danger is effectively avoided. The automatic short-circuit device has a reset function, and after the fault is eliminated, a signal is manually applied to a reset coil FW of the bistable power relay J to realize the reset. The cost and the use flexibility are considered.
4. The technical scheme can display the phase voltage and the current value of the A phase, the B phase and the C phase of the first meter changing loop and the second meter changing loop in real time, the safety of meter changing without power outage is guaranteed, the device has no electric quantity leakage, the safety is good, the operation is simple, repeated disconnecting and wiring are not needed, the consumed time is short, and the device is another innovation achievement in the intelligent measurement major.
Drawings
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a schematic circuit diagram of the automatic short-circuiting device of the present invention.
Fig. 3 is a schematic structural diagram of the present invention.
In the figure: 1. replacing the instrument; 101. a first epitope thimble; 102. a second epitope thimble; 103. a first switch; 104. a second switch; 105. a first automatic short circuiter; 106. a second automatic short circuiter; 107. a display screen; 108. a plug-in connector; 2. a junction box; 3. a cable; 4. a protoepitope.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, since the embodiments disclosed in the present invention can be arranged in different orientations, these terms indicating the orientation are merely for illustration and should not be construed as limiting, and for example, "upper" and "lower" are not necessarily limited to the orientation opposite to or identical to the direction of gravity.
In the first embodiment:
as shown in fig. 1, the utility model comprises a replacing instrument 1, a junction box 2 and a cable 3, wherein the replacing instrument 1 is connected with the junction box 2 through the cable 3; the junction box 2 is provided with a wiring terminal to connect the incoming line of the original meter position 4 of the electric energy meter, so that the replacing instrument 1 can be connected with the electric energy meter on the original meter position 4 in parallel; the replacing instrument 1 comprises an insulating shell, a first meter position thimble 101, a second meter position thimble 102, a first switch 103 and a second switch 104 which are positioned on the insulating shell, wherein the first meter position thimble 101 is connected with the first switch 103 to form a first meter replacing loop, a second original meter position 4 thimble is connected with the second switch 104 to form a second meter replacing loop, the first switch 103 controls the first meter replacing loop to be switched on and off, and the second switch 104 controls the second meter replacing loop to be switched on and off; the first meter changing loop and the second meter changing loop are connected in parallel; the replacing instrument 1 also comprises a first automatic short-circuiting device 105 and a second automatic short-circuiting device 106, wherein the first automatic short-circuiting device 105 is connected with the first meter replacing loop; the second automatic short-circuiting device 106 is connected with the second commutation loop; the first automatic short-circuiting device 105 and the second automatic short-circuiting device 106 are both provided with a normally open switch K1, two ends of the normally open switch K1 are electrically connected with two thimble leads of the same current transformer connected with the electric energy meter, and when the current exceeds the limit, the normally open switch K1 is closed, so that a secondary circuit of the current transformer is short-circuited.
When the meter replacing device is used, firstly, the cable 3 is connected with the replacing instrument 1 and the junction box 2, the new meter is fixed on the first meter position thimble 101 in a plugging manner, the corresponding first switch 103 is opened, the meter to be replaced in the original meter position 4 is taken down from the metering cabinet, the new meter is fixed on the second meter position thimble 102 in the plugging manner, the second switch 104 is opened, the first switch 103 is closed, the new meter is taken down and installed in the original meter position 4 of the metering cabinet, the second switch 104 is closed, the meter to be replaced is taken down, the connection between the replacing instrument 1 and the junction box 2 is disconnected, the alternate installation is completed through the non-power-off replacing device, the continuous metering is realized, and the electric quantity during the meter replacing period is completely compensated and recorded in the meter to be replaced and the new meter to be replaced. The automatic short circuiter can be at the in-process of changing, and when the current transformer secondary circuit appears opening a way and the overvoltage that produces, the action of automatic short circuiter, normally open switch K1 is closed, and the short circuit of current transformer secondary circuit, the overvoltage that opens a way disappears, effectively avoids the emergence of electric shock accident. The original meter position 4 is used for installing an old electric energy meter before replacement and a new electric energy meter after replacement.
Example two:
the same parts as those in the first embodiment are not described again, but the differences are as follows: as shown in fig. 2, each of the first automatic short-circuiting device 105 and the second automatic short-circuiting device 106 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a trigger, an energy storage element C1, and a relay J, wherein an anode of the first diode D1 and a cathode of the third diode D3 are connected to one input end of the secondary circuit of the current transformer, an anode of the fourth diode D4 and a cathode of the second diode D2 are connected to the other input end of the secondary circuit of the current transformer, and a cathode of the first diode D1 and a cathode of the fourth diode D4 are connected to one end of the energy storage element C1; the anode of the third diode D3 and the anode of the second diode D2 are connected with the other end of the energy storage element C1; the energy storage element C1 is connected with a trigger J in parallel, and the trigger J is connected with a coil of the relay J to control a normally open switch K1 in the relay J. The working is stable, the reliability is good, and the safety of meter replacement without power failure is ensured. The relay J is a bistable power relay J, and an action coil DZ and a reset coil FW are arranged on the relay J; the replacement instrument 1 is provided with a first reset switch for controlling the power loss of the reset coil FW in the first automatic short-circuiting device 105 and a second reset switch for controlling the power loss of the reset coil FW in the second automatic short-circuiting device 106, so as to apply a manual reset signal. The action coil DZ and the reset coil FW are positioned in a relay J, so that the automatic and manual functions are realized, and the use is flexible.
Change 1 parallelly connected access of appearance 4 return circuits of former epitope, change the first table circuit of changing of appearance 1 and second and change the table return circuit and form parallel connection, will wait to change the table and newly change the table alternating mount to first epitope thimble 101 and second epitope thimble 102 through the plug, the whole table in-process of changing, total 4 metering state: metering by an original meter position 4 electric energy meter; simultaneously metering a first epitope electric energy meter and an original epitope 4 electric energy meter; metering a first epitope electric energy meter and a second epitope electric energy meter; and simultaneously metering the second epitope electric energy meter and the original epitope 4 electric energy meter. During the meter changing period, due to current shunt, the sum of the metered electric quantity of each loop is equal to the total current, and no unmetered stage exists. And the first meter changing loop is disconnected, and the second meter changing loop is immediately connected with the original meter position 4 metering loop, so that the metering continuity is realized. The factors of misoperation are considered, the CT open circuit risk can occur in the process of meter changing, the automatic short-circuiting device diode identifies the overvoltage signal of the corresponding loop, the action coil DZ of the bistable power relay J receives the signal action, the normally open switch K1 is closed rapidly, the reset coil FW is arranged on the bistable power relay J, and the reset coil FW is reset immediately after the fault is eliminated, so that the safety of uninterrupted replacement is realized.
The automatic short-circuiting device of the embodiment is internally provided with the first diode D1 and the fourth diode D4, the characteristic that the diodes can absorb current only when exceeding threshold voltage is utilized, and the voltage of a secondary loop of the current transformer is very low when the meter changing process is normal, so that the automatic short-circuiting device is ensured not to be mistakenly operated. When the secondary circuit of the current transformer is in an open circuit and overvoltage is generated, the diode is conducted, the energy storage element C1 immediately stores energy, the trigger releases energy of the energy storage element C1, the bistable power relay J in the automatic short-circuit device receives trigger energy, the action coil DZ responds to act, the normally open switch K1 is immediately closed, the secondary circuit of the current transformer is in a short circuit, the open circuit overvoltage disappears, and electric shock danger is effectively avoided. The automatic short-circuit device has a reset function, and after the fault is removed, a signal is manually applied to a reset coil FW of the bistable power relay J to realize the reset. The cost and the use flexibility are considered.
Example three:
the same parts as those in the first embodiment are not described again, but the differences are as follows:
as shown in figure 3 of the drawings,
as a preferable technical means: one side of the replacing instrument 1 is a control panel, the left upper corner of the control panel is provided with a plug-in connector 108 matched with the cable 3, the control panel below the plug-in connector 108 is divided into a left area and a right area which are respectively a first epitope control area and a second epitope control area, and a first epitope thimble 101 and a second epitope thimble 102 are correspondingly arranged in the first epitope control area and the second epitope control area side by side; six display screens 107 arranged side by side are arranged below the first and second epitope thimbles 101 and 102; a first switch 104, a second switch 104, a first reset switch and a second reset switch are correspondingly arranged below the display screen 107. The display screen 107 is connected with the cable 3 and is used for correspondingly displaying the metering data of the electric energy meter on the first and second reinitiation meter positions 4 and 4. The real-time observation can be realized, and the operation correctness is improved. The operation is clear at a glance and is more convenient and fast, and the error is avoided.
The utility model discloses a take CT to open a way electric energy meter change device that does not have a power failure of automatic short circuit function that above fig. 1-3 shows the utility model discloses a concrete embodiment has embodied the utility model discloses substantive characteristics and progress can be according to actual use needs the utility model discloses an inspire, to its modification of carrying out the equivalence in aspects such as shape, structure, all be listed as the protection range of this scheme.
Claims (7)
1. An electric energy meter uninterrupted replacing device with a CT open circuit and automatic short circuit function comprises a replacing instrument (1), a junction box (2) and a cable (3), wherein the replacing instrument (1) is connected with the junction box (2) through the cable (3); the junction box (2) is provided with a wiring terminal to connect the incoming line of the original meter position (4) of the electric energy meter, so that the replacing instrument (1) can be connected with the electric energy meter on the original meter position (4) in parallel; the meter replacing device (1) comprises an insulating shell, and a first meter position thimble (101), a second meter position thimble (102), a first switch (103) and a second switch (104) which are positioned on the insulating shell, wherein the first meter position thimble (101) is connected with the first switch (103) to form a first meter replacing loop, the second meter position thimble (102) is connected with the second switch (104) to form a second meter replacing loop, the first switch (103) controls the first meter replacing loop to be switched on and off, and the second switch (104) controls the second meter replacing loop to be switched on and off; the first meter changing loop and the second meter changing loop are connected in parallel; the method is characterized in that: the meter replacing device (1) further comprises a first automatic short-circuiting device (105) and a second automatic short-circuiting device (106), wherein the first automatic short-circuiting device (105) is connected with the first meter replacing loop; the second automatic short-circuiting device (106) is connected with the second meter changing loop; the first automatic short circuiter (105) and the second automatic short circuiter (106) are respectively provided with a normally open switch K1, two ends of the normally open switch K1 are electrically connected with two thimble leads connected with the same current transformer of the electric energy meter, and when the current exceeds the limit, the normally open switch K1 is closed, so that a secondary circuit of the current transformer is short-circuited.
2. The uninterrupted replacing device of the electric energy meter with the CT open circuit and automatic short circuit function according to claim 1, characterized in that: the first automatic short-circuiting device (105) and the second automatic short-circuiting device (106) both comprise bistable power relays J, the actions of the normally-open switches K1 are controlled through the bistable power relays J, and the bistable power relays J are provided with action coils DZ and reset coils FW.
3. The uninterrupted replacing device for the electric energy meter with the CT open circuit and automatic short circuit function according to claim 2, characterized in that: the first automatic short-circuiting device (105) and the second automatic short-circuiting device (106) both comprise diodes for monitoring overvoltage generated by open circuit of the current transformer.
4. The uninterrupted replacing device of the electric energy meter with the CT open circuit and automatic short circuit function according to claim 1, characterized in that: the first automatic short-circuiting device (105) and the second automatic short-circuiting device (106) respectively comprise a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a trigger, an energy storage element C1 and a relay J, wherein the anode of the first diode D1 and the cathode of the third diode D3 are connected with one input end of a secondary circuit of the current transformer, the anode of the fourth diode D4 and the cathode of the second diode D2 are connected with the other input end of the secondary circuit of the current transformer, and the cathode of the first diode D1 and the cathode of the fourth diode D4 are connected with one end of the energy storage element C1; the anode of the third diode D3 and the anode of the second diode D2 are connected with the other end of the energy storage element C1; the energy storage element C1 is connected with a trigger J in parallel, and the trigger J is connected with a coil of the relay J to control the normally open switch K1 in the relay J.
5. The uninterrupted replacing device of the electric energy meter with the CT open circuit and automatic short circuit function according to claim 4, characterized in that: the relay J is a bistable power relay J, and an action coil DZ and a reset coil FW are arranged on the relay J; the replacing instrument (1) is provided with a first reset switch for controlling the power failure of the reset coil FW in the first automatic short-circuit device (105) and a second reset switch for controlling the power failure of the reset coil FW in the second automatic short-circuit device (106) so as to apply a manual reset signal.
6. The uninterrupted replacing device of the electric energy meter with the CT open circuit and automatic short circuit function according to claim 5, characterized in that: change appearance (1) and still include six display screen (107) that set up side by side, display screen (107) link to each other with cable (3), display screen (107) are used for showing first trade former epitope (4) and second trade the measurement data of electric energy meter on former epitope (4).
7. The uninterrupted replacing device of the electric energy meter with the CT open circuit and automatic short circuit function according to claim 4, characterized in that: one side of the replacing instrument (1) is a control panel, a plug-in connector (108) matched with the cable (3) is arranged at the upper left corner of the control panel, the control panel below the plug-in connector (108) is divided into a left area and a right area which are respectively a first epitope control area and a second epitope control area, and a first epitope thimble (101) and a second epitope thimble (102) are correspondingly arranged in the first epitope control area and the second epitope control area side by side; a display screen (107) arranged side by side is arranged below the first epitope thimble (101) and the second epitope thimble (102); a first switch (104), a second switch (104), a first reset switch and a second reset switch are correspondingly arranged below the display screen (107).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221096000.2U CN217587356U (en) | 2022-05-09 | 2022-05-09 | Uninterrupted replacing device with CT open circuit and automatic short circuit functions for electric energy meter |
| DE202023101582.4U DE202023101582U1 (en) | 2022-05-09 | 2023-03-29 | Alternating device for an electrical energy meter with an automatic short circuit function of an open CT circuit without power failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221096000.2U CN217587356U (en) | 2022-05-09 | 2022-05-09 | Uninterrupted replacing device with CT open circuit and automatic short circuit functions for electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217587356U true CN217587356U (en) | 2022-10-14 |
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ID=83551491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221096000.2U Active CN217587356U (en) | 2022-05-09 | 2022-05-09 | Uninterrupted replacing device with CT open circuit and automatic short circuit functions for electric energy meter |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN217587356U (en) |
| DE (1) | DE202023101582U1 (en) |
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2022
- 2022-05-09 CN CN202221096000.2U patent/CN217587356U/en active Active
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2023
- 2023-03-29 DE DE202023101582.4U patent/DE202023101582U1/en active Active
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| Publication number | Publication date |
|---|---|
| DE202023101582U1 (en) | 2023-05-11 |
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