CN216215860U - Insulation on-line monitoring device and non-electric quantity protection loop of transformer - Google Patents
Insulation on-line monitoring device and non-electric quantity protection loop of transformer Download PDFInfo
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- CN216215860U CN216215860U CN202122522363.XU CN202122522363U CN216215860U CN 216215860 U CN216215860 U CN 216215860U CN 202122522363 U CN202122522363 U CN 202122522363U CN 216215860 U CN216215860 U CN 216215860U
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Abstract
The utility model relates to an insulation on-line monitoring device, which is used for a transformer non-electric quantity protection device, wherein the transformer non-electric quantity protection device comprises a power supply, an action device and a circuit protection unit; the action device and the circuit protection unit are connected between the anode and the cathode of the power supply, and the insulation online monitoring device comprises an insulation detection circuit, a current mutual inductance circuit and a monitoring device; the insulation detection circuit is arranged between the anode and the cathode of the power supply, and the current mutual inductance circuit is arranged at the anode and the cathode of the action device to detect leakage current; the monitoring device is connected with the current mutual inductance circuit, receives leakage current and converts the leakage current into an insulation resistance value to output an insulation result. The utility model also relates to a transformer non-electric quantity protection loop, which comprises a transformer non-electric quantity protection device and an insulation online monitoring device; the utility model can enable operation and maintenance personnel to know the insulation condition of the non-electric quantity alarm loop in time and eliminate hidden dangers, thereby greatly reducing the risks of false alarm and false tripping of the large transformer.
Description
Technical Field
The utility model relates to the field of insulation monitoring, in particular to an insulation online monitoring device and a transformer non-electric quantity protection loop.
Background
In plant areas such as large power plants, large chemical plants, and oil refineries, large oil-immersed transformers are indispensable. Large transformers are generally provided with non-electric protection devices, such as gas relays, pressure relief valves, oil pressure snap relays, oil level gauges and other components.
The non-electric quantity protection is a protection device which triggers protection action or alarm by a fault reflected by the non-electric quantity. The criterion of protection is not the electric quantity such as current and voltage, but the non-electric quantity such as heavy gas (set by oil speed), temperature (set by temperature). Taking the transformer heavy gas protection as an example, the non-electric quantity protection device is connected with a dry contact in the gas relay and a direct current system through cables, when the oil speed reaches a setting value, the gas relay acts, the dry contact is closed, and direct current voltage acts on a corresponding relay in the protection device to enable the protection to act.
False alarm phenomena such as the reduction of secondary terminal insulation, the triggering of insulation faults of a direct current system and the like can occur in the operation of a unit due to the fact that a non-electric relay junction box is not tightly sealed and water enters and is affected with damp; if not handled in time, the insulation may gradually deteriorate, resulting in non-power protection malfunctions. In addition, insulation failure between contacts can also directly lead to non-battery protection malfunction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an insulation online monitoring device and a transformer non-electric quantity protection loop, which can monitor whether insulation abnormity exists in transformer non-electric quantity protection in real time.
The technical scheme adopted by the utility model for solving the technical problems is as follows: an insulation online monitoring device is constructed and used for a transformer non-electric quantity protection device, and the transformer non-electric quantity protection device comprises a power supply, an action device U1 and a circuit protection unit; the action device U1 and the circuit protection unit are connected between the positive pole and the negative pole of the power supply, and when the action device U1 is closed, the power supply is switched on to supply power to the circuit protection unit to execute protection action;
the insulation online monitoring device comprises an insulation detection circuit, a current mutual inductance circuit and a monitoring device; the insulation detection circuit is arranged between the positive pole and the negative pole of the power supply, and the insulation detection circuit forms a passage when the insulation fails;
the current transformer circuit is provided at the positive and negative electrodes of the action device U1 to detect a leakage current;
the monitoring device is connected with the current mutual inductance circuit, receives the leakage current and converts the leakage current into an insulation resistance value to output an insulation result.
Preferably, the insulation detection circuit includes a first resistor RQ connected between the positive electrode and the negative electrode of the power supply in parallel with the operation device U11And a second resistor RQ2And an insulation resistance R1;
the first resistor RQ1And a second resistor RQ2Connected in series, said first resistance RQ1A first end connected to the positive electrode of the power supply, and a first resistor RQ1One path of the second end is grounded, and the other path of the second end passes through the second resistor RQ2Connecting the negative electrode of the power supply;
a first end of the insulation resistor R1 is connected with the action device U1, and a second end of the insulation resistor R1 is grounded;
in the event of an insulation fault, the negative electrode of the actuator U1 is grounded via the insulation resistor R1, and the first resistor RQ1And forming a path with the positive electrode of the power supply to form leakage current.
Preferably, the current transformer circuit comprises a first current transformer L1 and a second current transformer L2, the positive pole of the first current transformer L1 is connected with the positive pole of the power supply, the negative pole of the first current transformer L1 is connected to the input end of the monitoring device, and the output end of the monitoring device is connected with the second current transformer L2 and is connected to the negative pole of the power supply.
Preferably, the circuit protection unit comprises an optocoupler relay U2 and an electronic alarm;
the positive pole of the transmitting end of the optocoupler relay U2 is connected with the positive pole of the power supply, the negative pole of the transmitting end of the optocoupler relay U2 is connected with the first end of the action device U1, the collector C of the receiving end of the optocoupler relay U2 is connected with the positive pole of the electronic alarm, and the emitter E of the receiving end of the optocoupler relay U2 is connected with the negative pole of the electronic alarm.
Preferably, the actuating device U1 is a buchholz relay or a pressure relief valve.
Preferably, the insulation on-line monitoring device further comprises a display device for displaying the monitoring result and data of the system, and the display device is connected with the monitoring device.
Preferably, said first resistance RQ1And a second resistor RQ2The resistance values of (a) are all 62 kilo-ohms.
The utility model also constructs a transformer non-electric quantity protection loop, which comprises a transformer non-electric quantity protection device and an insulation online monitoring device; the transformer non-electric quantity protection device comprises a power supply, an action device and a circuit protection unit; the action device and the circuit protection unit are connected between the anode and the cathode of the power supply, and when the action device is closed, the power supply is switched on to supply power to the circuit protection unit to execute protection action;
the insulation online monitoring device comprises an insulation detection circuit, a current mutual inductance circuit and a monitoring device; the insulation detection circuit is arranged between the positive pole and the negative pole of the power supply, and the insulation detection circuit forms a passage when the insulation fails;
the current transformer circuit is arranged at the positive pole and the negative pole of the action device to detect leakage current;
the monitoring device is connected with the current mutual inductance circuit, receives the leakage current and converts the leakage current into an insulation resistance value to output an insulation result.
Preferably, the insulation detection circuit includes a first resistor RQ connected between the positive electrode and the negative electrode of the power supply in parallel with the operation device1And a second resistor RQ2And an insulation resistance R1;
the first resistor RQ1And a second resistor connected in series, the first resistor RQ1A first end connected to the positive electrode of the power supply, and a first resistor RQ1One path of the second end is grounded, and the other path of the second end passes through the second resistor RQ2Connecting the negative electrode of the power supply;
a first end of the insulation resistor R1 is connected with the action device, and a second end of the insulation resistor R1 is grounded;
in the event of an insulation failure, the negative electrode of the operation device is grounded via the insulation resistor R1, and the first resistor RQ1And forming a path with the positive electrode of the power supply to form leakage current.
Preferably, the current transformer circuit comprises a first current transformer L1 and a second current transformer L2, the positive pole of the first current transformer L1 is connected with the positive pole of the power supply, the negative pole of the first current transformer L1 is connected to the input end of the monitoring device, and the output end of the monitoring device is connected with the second current transformer L2 and is connected to the negative pole of the power supply.
The implementation of the utility model has the following beneficial effects: the leakage current is measured and the insulation resistance value is converted, the insulation condition of the non-electric quantity protection loop is measured, and the insulation condition is monitored and recorded in real time, so that operation and maintenance personnel can know the insulation condition of the non-electric quantity alarm loop in time and eliminate hidden dangers, and the risks of false alarm and false tripping of a large transformer are greatly reduced.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of a first embodiment of an insulation on-line monitoring device according to the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of the insulation on-line monitoring device according to the present invention;
fig. 3 is a schematic circuit diagram of the non-electrical protection circuit of the transformer of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the utility model. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
A first embodiment, as shown in fig. 1, is an application of an insulation on-line monitoring device provided in the present invention to a non-electric-quantity protection device of a transformer. The insulation on-line monitoring device provided by the utility model can be applied to non-electric quantity protection devices of large transformers such as main transformer, auxiliary transformer and high-voltage reactor, so as to improve the reliability of a power supply system. The transformer non-electric quantity protection device 1 comprises a power supply 11, an action device U112 and a circuit protection unit 13; the power supply 11 is a 110V dc power supply. It will be appreciated that in some embodiments, power supplies of other voltage levels may be employed. The action device U112 and the circuit protection unit 13 are connected between the anode and the cathode of the power supply 11, and when the action device U112 is closed, the power supply 11 is switched on to supply power to the circuit protection unit 13 to execute protection action;
the insulation online monitoring device 2 comprises an insulation detection circuit 21, a current mutual inductance circuit 22 and a monitoring device 23; the insulation detection circuit 21 is provided between the positive electrode and the negative electrode of the power supply 11, and the insulation detection circuit 21 forms a path in the event of an insulation failure;
a current transformer circuit 22 is provided at the positive and negative electrodes of the action device U112 to detect a leakage current;
the monitor 23 is connected to the current transformer circuit 22, receives the leakage current, converts the leakage current into an insulation resistance value, and outputs an insulation result.
The actuating device U112 is a protection device of the transformer, is arranged in a pipeline between an oil storage cabinet and an oil tank of the transformer, and when the oil is decomposed to generate gas or oil flow surges due to internal faults of the transformer, the contact of the actuating device U112 is actuated to connect a specified control loop, and a signal warning (light gas) is sent out in time or a protection element is started to automatically cut off the transformer (heavy gas).
Further, the actuator U112 may be a gas relay, a pressure relief valve, or the like.
Further, the monitoring device includes a controller, which includes but is not limited to a microprocessor, a microcontroller, a digital signal processor, a microcomputer, a central processing unit, a field programmable gate array, a programmable logic device, a state machine, a logic circuit, an analog circuit, a digital circuit and/or any device that operates signals (analog and/or digital) based on operation instructions, and which may adopt a control scheme such as a commercially mature master MCU, or be modified or innovated according to requirements, which will not be described in detail herein.
Further, the insulation detection circuit 21 includes a first resistor RQ connected between the positive electrode and the negative electrode of the power source 11 in parallel with the operation device U1121And a second resistor RQ2And an insulation resistance R1;
first resistor RQ1And a second resistor RQ2Connected in series, a first resistor RQ1A first end connected to the positive electrode of the power supply 11 and a first resistor RQ1The second end is grounded, and the other end passes through a second resistor RQ2Connecting the negative pole of the power supply 11;
a first end of the insulation resistor R1 is connected with the operating device U112, and a second end of the insulation resistor R1 is grounded;
in the event of an insulation failure, the negative electrode of the actuator U112 is grounded via the insulation resistor R1, and the first resistor RQ1Forming a path with the positive electrode of the power supply 11 and forming a leakage current.
Further, a first resistor RQ1And a second resistor RQ2The resistance values of (a) are all 62 kilo-ohms.
Further, the current transformer circuit 22 includes a first current transformer L1 and a second current transformer L2, the positive pole of the first current transformer L1 is connected to the positive pole of the power source 11, the negative pole of the first current transformer L1 is connected to the input terminal of the monitoring device 23, and the output terminal of the monitoring device 23 is connected to the second current transformer L2 and is connected to the negative pole of the power source 11. The current transformer circuit detects leakage currents of the positive electrode and the negative electrode of the action contact respectively, sends current measurement signals to the monitoring device, and the monitoring device calculates insulation resistance values of the positive electrode and the negative electrode through conversion and compares the insulation resistance values with historical values to confirm whether insulation abnormal reduction exists.
Further, a first resistor RQ1And a second resistor RQ2The resistance values of (a) are all 62 kilo-ohms.
In the second embodiment, as shown in fig. 2, further, the circuit protection unit 13 includes an optocoupler relay U2131 and an electronic alarm 132; the optocoupler relay U2 belongs to a solid-state relay, a general electromagnetic relay enables an iron core to become a magnetic magnet attraction armature through a coil by means of current, so that the related contact acts to control the on-off of a load, and the optocoupler relay does not have a contact, so that electric shock abrasion cannot occur, and the service life is long.
Specifically, the positive electrode of the transmitting end of the optocoupler relay U2 is connected with the positive electrode of the power supply 11, the negative electrode of the transmitting end of the optocoupler relay U2 is connected with the first end of the action device U112, the collector C of the receiving end of the optocoupler relay U2 is connected with the positive electrode of the electronic alarm, and the emitter E of the receiving end of the optocoupler relay U2 is connected with the negative electrode of the electronic alarm. When the optical coupling relay U2 is abnormal, an electronic alarm is triggered to give an alarm, which shows that the insulation online monitoring device has a fault and reminds a worker to overhaul.
Further, the insulation on-line monitoring device 2 further comprises a display device 24 for displaying the monitoring result and data of the system, and the display device 24 is connected with the monitoring device 23. The monitoring device 23 receives the leakage current and converts it into an insulation resistance value to output an insulation result, and the insulation result may be transmitted to the display device 24 to be displayed. Further, the display device 24 may also be a touch screen, and besides the display function, the display device may also set functions such as parameter setting, operation recording, current state display, and fault recording on the touch screen, so as to monitor and display relevant parameters and data in real time, and store the data in a memory card of the touch screen, thereby facilitating downloading and analysis.
As shown in fig. 3, in the non-electric-quantity protection circuit for a transformer according to the present invention, the measurement circuit and the protection circuit are independent from each other, and the normal operation of the non-electric-quantity protection circuit is not affected, and when a large oil-immersed transformer operates, the hall current sensor may be used to measure a leakage current, so as to determine whether the non-electric-quantity protection circuit has an insulation fault. The transformer non-electric quantity protection loop comprises a transformer non-electric quantity protection device and an insulation online monitoring device 2; the transformer non-electric quantity protection device comprises a power supply 11, an action device and a circuit protection unit 13; the action device and circuit protection unit 13 is connected between the anode and the cathode of the power supply 11, and when the action device is closed, the power supply 11 is switched on to supply power to the circuit protection unit 13 to execute protection action;
the insulation online monitoring device 2 comprises an insulation detection circuit 21, a current mutual inductance circuit 22 and a monitoring device 23; the insulation detection circuit 21 is provided between the positive electrode and the negative electrode of the power supply 11, and the insulation detection circuit 21 forms a path in the event of an insulation failure;
a current transformer circuit 22 is provided at the positive and negative electrodes of the action device to detect a leakage current;
the monitor 23 is connected to the current transformer circuit 22, receives the leakage current, converts the leakage current into an insulation resistance value, and outputs an insulation result.
Further, the insulation detection circuit 21 includes a first resistor RQ connected between the positive electrode and the negative electrode of the power source 11 in parallel with the operation device1And a second resistor RQ2And an insulation resistance R1;
first resistor RQ1Connected in series with a second resistor, a first resistor RQ1A first end connected to the positive electrode of the power supply 11 and a first resistor RQ1The second end is grounded, and the other end passes through a second resistor RQ2Is connected with the negative end of the power supply 11A pole;
a first end of the insulation resistor R1 is connected with the action device, and a second end of the insulation resistor R1 is grounded;
in the event of an insulation failure, the negative electrode of the actuator is grounded via an insulation resistor R1, and a first resistor RQ1Forming a path with the positive electrode of the power supply 11 and forming a leakage current.
Further, the current transformer circuit 22 includes a first current transformer L1 and a second current transformer L2, the positive pole of the first current transformer L1 is connected to the positive pole of the power source 11, the negative pole of the first current transformer L1 is connected to the input terminal of the monitoring device 23, and the output terminal of the monitoring device 23 is connected to the second current transformer L2 and is connected to the negative pole of the power source 11. The current transformer circuit detects leakage currents of the positive electrode and the negative electrode of the action contact respectively, sends current measurement signals to the monitoring device, and the monitoring device calculates insulation resistance values of the positive electrode and the negative electrode through conversion and compares the insulation resistance values with historical values to confirm whether insulation abnormal reduction exists.
The measurement principle of the utility model is as follows:
take the case of insulation failure of the cathode of the gas relay action contact as an example. The contact negative electrode insulation resistance to ground is R1. Then the negative pole is connected to ground, RQ, through R11Forming a path with the positive electrode to form a leakage current. The magnitude of the leakage current is:
leakage current ILeakageAs measured by a current transformer, the insulation resistance R1(Ω) is then converted to:
such as when a leakage current I is detectedLeakageAt 1mA, then
If there is an insulation fault at the positive pole of the operating contact, the calculation principle is the same as that of the negative pole, but the resistance value of the protective relay needs to be taken into account, and will not be described in detail here.
According to the utility model, through the measurement of leakage current and the conversion of the insulation resistance value by the online monitoring device, the insulation resistance value is measured once per second, the minimum insulation value in one minute is recorded every minute, and insulation data is recorded to form a trend curve. And an insulation alarm fixed value can be set, for example, an alarm is given when the insulation resistance value is less than 10K omega, so that operation and maintenance personnel can be reminded in time to pay attention to insulation information. The alarm setting value can be set autonomously by the user. The operation and maintenance personnel can know the insulation condition of the non-electric quantity alarm loop in time and eliminate hidden dangers, and the risks of false alarm and false tripping of the large transformer are greatly reduced.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. An insulation online monitoring device is used for a transformer non-electric quantity protection device, wherein the transformer non-electric quantity protection device (1) comprises a power supply (11), an action device U1(12) and a circuit protection unit (13); the action device U1(12) and the circuit protection unit (13) are connected between the positive pole and the negative pole of the power supply (11), and when the action device U1(12) is closed, the power supply (11) is switched on to supply power to the circuit protection unit (13) to execute protection action; it is characterized in that the preparation method is characterized in that,
the insulation online monitoring device (2) comprises an insulation detection circuit (21), a current mutual inductance circuit (22) and a monitoring device (23); the insulation detection circuit (21) is arranged between the positive pole and the negative pole of the power supply (11), and the insulation detection circuit (21) forms a passage when the insulation fails;
the current transformer circuit (22) is provided at the positive and negative electrodes of the action device U1(12) to detect a leakage current;
the monitoring device (23) is connected to the current transformer circuit (22), receives the leakage current, converts the leakage current into an insulation resistance value, and outputs an insulation result.
2. The insulation on-line monitoring device according to claim 1, characterized in that the insulation detection circuit (21) comprises a first resistor RQ connected in parallel with the motion device U1(12) between the positive pole and the negative pole of the power supply (11)1And a second resistor RQ2And an insulation resistance R1;
the first resistor RQ1And a second resistor RQ2Connected in series, said first resistance RQ1The first end is connected with the anode of the power supply (11), and the first resistor RQ1One path of the second end is grounded, and the other path of the second end passes through the second resistor RQ2The negative pole of the power supply (11) is connected;
a first end of the insulation resistor R1 is connected with the actuating device U1(12), and a second end of the insulation resistor R1 is grounded;
in the event of an insulation fault, the negative electrode of the actuator U1(12) is grounded via the insulation resistor R1, and the first resistor RQ1And a path is formed with the positive electrode of the power supply (11) to form a leakage current.
3. The insulation monitoring device according to claim 2, wherein the current transformer circuit (22) comprises a first current transformer L1 and a second current transformer L2, the positive pole of the first current transformer L1 is connected to the positive pole of the power supply (11), the negative pole of the first current transformer L1 is connected to the input of the monitoring device (23), and the output of the monitoring device (23) is connected to the second current transformer L2 and is connected to the negative pole of the power supply (11).
4. The insulation on-line monitoring device according to claim 1, characterized in that the circuit protection unit (13) comprises an optocoupler relay U2(131) and an electronic alarm (132);
the emitting end of opto-coupler relay U2(131) is anodal with power (11) positive pole links to each other, the emitting end negative pole of opto-coupler relay U2(131) with the first end of action device U1(12) links to each other, the receiving terminal collecting electrode C of opto-coupler relay U2(131) with electronic alarm (132) positive pole links to each other, the receiving terminal projecting pole E of opto-coupler relay U2(131) with electronic alarm (132) negative pole links to each other.
5. The insulation on-line monitoring device according to claim 1, wherein the actuating device U1(12) is a gas relay or a pressure relief valve.
6. The insulation monitoring device according to claim 1, wherein the insulation monitoring device (2) further comprises a display device (24) for displaying system monitoring results and data, the display device (24) being connected to the monitoring device (23).
7. The insulated on-line monitoring device according to claim 2, wherein the first resistor RQ1And a second resistor RQ2The resistance values of (a) are all 62 kilo-ohms.
8. A transformer non-electric quantity protection loop is characterized by comprising a transformer non-electric quantity protection device (1) and an insulation online monitoring device (2); the transformer non-electric quantity protection device (1) comprises a power supply (11), an action device and a circuit protection unit (13); the action device and circuit protection unit (13) is connected between the anode and the cathode of the power supply (11), and when the action device is closed, the power supply (11) is switched on to supply power to the circuit protection unit (13) to execute protection action;
the insulation online monitoring device (2) comprises an insulation detection circuit (21), a current mutual inductance circuit (22) and a monitoring device (23); the insulation detection circuit (21) is arranged between the positive pole and the negative pole of the power supply (11), and the insulation detection circuit (21) forms a passage when the insulation fails;
the current transformer circuit (22) is provided at the positive and negative electrodes of the action device to detect a leakage current;
the monitoring device (23) is connected to the current transformer circuit (22), receives the leakage current, converts the leakage current into an insulation resistance value, and outputs an insulation result.
9. The non-electric quantity protection circuit of the transformer according to claim 8, characterized in that said insulation detection circuit (21) comprises a first resistor RQ connected in parallel with said motion device between the positive pole and the negative pole of said power supply (11)1And a second resistor RQ2And an insulation resistance R1;
the first resistor RQ1And a second resistor connected in series, the first resistor RQ1The first end is connected with the anode of the power supply (11), and the first resistor RQ1One path of the second end is grounded, and the other path of the second end passes through the second resistor RQ2The negative pole of the power supply (11) is connected;
a first end of the insulation resistor R1 is connected with the action device, and a second end of the insulation resistor R1 is grounded;
in the event of an insulation failure, the negative electrode of the operation device is grounded via the insulation resistor R1, and the first resistor RQ1And a path is formed with the positive electrode of the power supply (11) to form a leakage current.
10. The transformer non-electric quantity protection circuit according to claim 9, characterized in that the current transformer mutual inductance circuit (22) comprises a first current transformer L1 and a second current transformer L2, the positive pole of the first current transformer L1 is connected to the positive pole of the power supply (11), the negative pole of the first current transformer L1 is connected to the input end of the monitoring device (23), and the output end of the monitoring device (23) is connected to the second current transformer L2 and is connected to the negative pole of the power supply (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122522363.XU CN216215860U (en) | 2021-10-19 | 2021-10-19 | Insulation on-line monitoring device and non-electric quantity protection loop of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122522363.XU CN216215860U (en) | 2021-10-19 | 2021-10-19 | Insulation on-line monitoring device and non-electric quantity protection loop of transformer |
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| Publication Number | Publication Date |
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| CN216215860U true CN216215860U (en) | 2022-04-05 |
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| CN202122522363.XU Active CN216215860U (en) | 2021-10-19 | 2021-10-19 | Insulation on-line monitoring device and non-electric quantity protection loop of transformer |
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