CN111812437A - Calibration device for relay protection device and calibration method thereof - Google Patents
Calibration device for relay protection device and calibration method thereof Download PDFInfo
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- CN111812437A CN111812437A CN202010672864.3A CN202010672864A CN111812437A CN 111812437 A CN111812437 A CN 111812437A CN 202010672864 A CN202010672864 A CN 202010672864A CN 111812437 A CN111812437 A CN 111812437A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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Abstract
The invention belongs to the technical field of module design of an electric relay protection device, and particularly relates to a calibration device and a calibration method for the relay protection device, wherein the calibration device comprises the following steps: the device comprises a direct current power supply, three variable alternating current sources, one variable alternating current source, a to-be-verified protection device wiring port group, a switch assembly, a variable alternating current source knob, a protection node action indicating lamp group, a variable alternating voltage knob, a grounding port, a grounding wire and a plurality of follow wires; the direct current power supply, the three variable alternating current sources and the one variable alternating current voltage source are respectively connected with a configuration port of a wiring port group of the protection device to be verified; the variable alternating current source knob is connected with the three paths of variable alternating current sources; the variable alternating voltage knob is connected with a variable alternating voltage source; and the protection node action indicator lamp group is respectively connected with a configuration port of a wiring port group of the protection device to be verified.
Description
Technical Field
The invention belongs to the technical field of module design of electric relay protection devices, and particularly relates to a calibration device and a calibration method for a relay protection device.
Background
The relay protection device in the power system of No. 3 and No. 4 unit of a certain nuclear power station can reflect the fault of the service bus, quickly, accurately and selectively act on the breaker to cut off fault equipment, and the reliable operation of the system is guaranteed. The service relay protection devices are divided into protection devices such as transformer comprehensive protection devices, motor protection comprehensive protection devices, differential protection comprehensive protection devices and the like, and the total number of the protection devices is about 400. The calibration of protection device is the important work of power plant's overhaul relay protection, and at the check-up in-process of reality, because the check-up wiring is miscellaneous, and is in large quantity, the calibration equipment leads to the experimental result deviation big with by a series of factors such as calibration equipment often because of sensitivity matching degree inconsistent, the experiment is gone on repeatedly, repeats, wrong to the protection device calibration, not only damages laboratory glassware, delays the time limit for a project, still can cause the incident even.
Therefore, it is necessary to design a calibration device and a calibration method for a relay protection device to solve the above technical problems, so as to improve the calibration efficiency of the protection device, reduce the overhaul working time of the nuclear power station, improve the economic benefit, and reduce the safety risk of personnel and equipment.
Disclosure of Invention
The invention aims to design a calibration device and a calibration method for a relay protection device, and aims to solve the technical problems that electrical error touch, error touch and error connection are easy to occur when an operator calibrates the relay protection device in field work.
The technical scheme of the invention is as follows:
a calibration device for a relay protection device, comprising: the device comprises a direct current power supply, three variable alternating current sources, one variable alternating current source, a to-be-verified protection device wiring port group, a switch assembly, a variable alternating current source knob, a protection node action indicating lamp group, a variable alternating voltage knob, a grounding port, a grounding wire and a plurality of follow wires;
the direct current power supply, the three variable alternating current sources and the one variable alternating current voltage source are respectively connected with a configuration port of a wiring port group of the protection device to be verified;
the variable alternating current source knob is connected with the three paths of variable alternating current sources;
the variable alternating voltage knob is connected with a variable alternating voltage source;
the protection node action indicator lamp group is respectively connected with a configuration port of a wiring port group of the protection device to be verified;
the ground port is connected with a configuration port of a wiring port group of the protection device to be verified through a ground wire;
the switch button assembly includes: the system comprises a three-way variable alternating current source selection switch A, a three-way variable alternating current source selection switch B, a three-way variable alternating current source selection switch C, a direct current source end air switch and a one-way variable alternating current source air switch;
the variable alternating current voltage source air switch is connected with a variable alternating current voltage source through a lead;
the three-way variable alternating current source selection switch A, the three-way variable alternating current source selection switch B and the three-way variable alternating current source selection switch C are respectively connected with the three-way variable alternating current source in parallel through conducting wires;
and the air switch of the direct current power supply end is connected with a direct current power supply through a lead.
The port group of the wiring of the protection device to be verified comprises: the device comprises a to-be-verified protection device variable voltage input port, a to-be-verified protection device variable current input port, a to-be-verified protection device auxiliary power supply port, a protection device action node action indicating lamp group port and a to-be-verified protection device grounding port;
the one-path variable alternating current voltage source is connected with a variable voltage input port of the protection device to be verified;
the three paths of variable alternating current voltage sources are connected with a variable current input port of the protection device to be verified;
the direct current power supply is connected with an auxiliary power supply port of the protection device to be verified;
the protection node action indicating lamp group is connected with a port of the protection device action node action indicating lamp group; the protection device action node action indicating lamp group port further comprises: the protection device comprises a first group of protection device action node wiring terminals, a second group of protection device action node wiring terminals, a third group of protection device action node wiring terminals, a fourth group of protection device action node wiring terminals and a fifth group of protection device action node wiring terminals;
and the grounding port is connected with the grounding port of the protection device to be verified.
The protection node action indicating lamp group comprises: the system comprises a first node indicator light, a second node indicator light, a third node indicator light, a fourth node indicator light and a fifth node indicator light; the first node indicator lamp is connected with the first group of protection device action node wiring terminals, the second node indicator lamp is connected with the second group of protection device action node wiring terminals, the third node indicator lamp is connected with the third group of protection device action node wiring terminals, and the fourth node indicator lamp is connected with the fourth group of protection device action node wiring terminals, the fifth node indicator lamp is connected with the fifth group of protection device action node wiring terminals.
The current range of the three-way variable alternating current source is 0-1A and 0-5A.
The protection device to be verified of the direct current power supply provides a 220V external auxiliary power supply.
The voltage range of the variable alternating current voltage source is 0-400V.
A method for verifying the verifying device for the relay protection device as described above, comprising the following steps:
the method comprises the following steps: connecting the calibration device with a corresponding interface of the relay protection device, and connecting a grounding wire of the calibration device with a grounding point of the relay protection device;
step two: connecting a protection node action indicating lamp group on the verification device with an action node of the protection device to be verified through a protection node action indicating lamp group port;
connecting one path of variable alternating current voltage source in the checking device with the voltage input of the protection device; connecting three variable alternating current sources in the checking device with the current input of the protection device, and connecting a direct current power supply end of the checking device with an auxiliary power supply of the protection device;
step three: closing an air switch at a direct current power supply end to electrify a protection device to be inspected; the three-way variable alternating current source selection switch A, the three-way variable alternating current source selection switch B and the three-way variable alternating current source selection switch C are closed, and an input current module of the protection device to be verified is electrified; rotating a variable alternating current power supply knob to adjust the magnitude of input current;
and if the input current reaches the rated value of the protection device, the corresponding lamp in the five node indicator lamps of the verification device is on, the relevant current value is recorded, and the current verification is finished.
Step four: closing one path of variable alternating current voltage source air switch, and electrifying an input voltage module of the protection device to be verified; rotating a variable alternating current voltage source knob, adjusting the input voltage, if the input voltage reaches the rated value of the protection device, lighting five node indicator lamps of the verification device, recording related voltage values, and finishing voltage verification;
step five: and after the verification test is finished, disconnecting the air switch at the direct current power supply end, the three paths of variable alternating current source switches and the one path of variable alternating current source air switch in the verification device, and disconnecting the connection line between the verification device and the protection device.
The invention has the beneficial effects that:
the invention can carry out the calibration of different protection types on different relay protection devices through the centralized modular wiring, and the device also has the following technical advantages:
[1] the device can classify the protection types of the protection device, and different types of protection verification are performed through different modules of the device, so that the protection verification time is shortened, and the verification accuracy is improved.
[2] The relay protection calibration device integrates calibration wiring in the device, reduces the wiring times of operators during calibration, and avoids the problem of disordered test lines during traditional calibration.
[3] The relay protection calibration device designed by the invention has the advantages of simple display, simple operation, simple overall structure, small volume, convenience in carrying and use and high sensitivity;
[4] this device internal relay module, the good reliability, the maintenance and the maintenance in the later stage of being convenient for, the device has waterproof, dustproof, leak protection electric function.
Drawings
Fig. 1 is a schematic structural diagram of a calibration device for a relay protection device according to the present invention;
FIG. 2 is an electrical wiring diagram of a checking device for a relay protection device according to the present invention;
Detailed Description
The invention will be further described with reference to the following figures and examples:
a calibration device for a relay protection device, comprising: the device comprises a direct current power supply 1, three variable alternating current sources 2, one variable alternating current voltage source 3, a to-be-verified protection device wiring port group 36, a switch assembly 37, a variable alternating current source knob 38, a protection node action indicator lamp group 39, a variable alternating voltage knob 40, a grounding port 9, a grounding wire 10 and a plurality of follow wires;
the direct-current power supply 1, the three variable alternating-current sources 2 and the one variable alternating-current voltage source 3 are respectively connected with a configuration port of a wiring port group 36 of the protection device to be verified;
the variable alternating current source knob 38 is connected with the three-way variable alternating current source 2; the variable ac current source knob 38 can adjust the amount of current to obtain the protection device operation value.
The variable alternating voltage knob 40 is connected with a variable alternating voltage source 3; the variable ac current source knob 40 can adjust the amount of voltage to obtain the protection device operation value.
The protection node action indicating lamp group 39 is respectively connected with the configuration ports of the wiring port group 36 of the protection device to be verified;
the grounding port 9 is connected with a configuration port of a wiring port group 36 of the protection device to be verified through a grounding wire 10;
the switch button assembly 7 includes: three-way variable alternating current source selector switch A32, three-way variable alternating current source selector switch B33, three-way variable alternating current source selector switch C34, direct current power supply end air switch 31 and one-way variable alternating current voltage source air switch 35;
the variable alternating current voltage source air switch 35 is connected with the variable alternating current voltage source 3 through a lead;
the three-way variable alternating current source selection switch A32, the three-way variable alternating current source selection switch B33 and the three-way variable alternating current source selection switch C34 are respectively connected with the three-way variable alternating current source 2 in parallel through conducting wires;
the direct current power supply end air switch 31 is connected with the direct current power supply 1 through a lead.
The port group 36 for the connection of the protection device to be verified includes: the device comprises a to-be-verified protection device variable voltage input port, a to-be-verified protection device variable current input port, a to-be-verified protection device auxiliary power supply port, a protection device action node action indicating lamp group port and a to-be-verified protection device grounding port;
the one-path variable alternating current voltage source 3 is connected with a variable voltage input port of the protection device to be verified;
the three paths of variable alternating current voltage sources 2 are connected with a variable current input port of the protection device to be verified;
the direct current power supply 1 is connected with an auxiliary power supply port of the protection device to be verified;
the protection node action indicating lamp group 39 is connected with the protection device action node action indicating lamp group port; the protection device action node action indicating lamp group port further comprises: the protection device comprises a first group of protection device action node wiring terminals, a second group of protection device action node wiring terminals, a third group of protection device action node wiring terminals, a fourth group of protection device action node wiring terminals and a fifth group of protection device action node wiring terminals;
the grounding port 9 is connected with a grounding port of the protection device to be verified; the grounding port 9 is connected with the checking device, and when the internal element is damaged and the leakage current occurs, the leakage current is grounded, so that personal injury is prevented; the grounding wire 10 connects the protection device to be verified with the grounding port 9 of the verification device, and when the protection device is abnormally damaged, the leakage current is grounded to prevent personal injury.
The protection node action indicating lamp group 39 includes: a first node indicator light 8, a second node indicator light 7, a third node indicator light 6, a fourth node indicator light 5 and a fifth node indicator light 4; the first node indicator lamp is connected with the first group of protection device action node wiring terminals, the second node indicator lamp is connected with the second group of protection device action node wiring terminals, the third node indicator lamp is connected with the third group of protection device action node wiring terminals, and the fourth node indicator lamp is connected with the fourth group of protection device action node wiring terminals, the fifth node indicator lamp is connected with the fifth group of protection device action node wiring terminals.
The protection node action indicating lamp group 39 is electrified with the main node of the checked protection device when the checked protection device acts, so that the corresponding action node indicating lamp of the checking device is lightened, a relay action signal is displayed, and the action node of the protection device can be displayed according to the indicating lamp.
The current range of the three variable alternating current sources is 0-1A and 0-5A; in the embodiment, the three-way variable alternating current source provides current sources of 0-1A and 0-5A for the protection device to be verified in a mode that a three-way variable alternating current source selection switch A32, a three-way variable alternating current source selection switch B33 and a three-way variable alternating current source selection switch C34 are connected in parallel.
When the current amount of the protection device is verified, the verified device is connected with the three variable alternating current power supplies, the current value is gradually increased to enable the verified device to perform protection action, the current value of the alternating current power supply at the moment is read, and the current value is the action value of the verified protection device at the moment. When the device to be verified needs to use 0-1A, the range can be selected by using the gear of the three-way variable alternating current source selection switch, and when the device to be verified needs to use 0-5A, the range can be selected by using the gear of the three-way variable alternating current source selection switch; namely, the current gear switches on the three-way variable alternating current source selector switch A32, the three-way variable alternating current source selector switch B33 and the three-way variable alternating current source selector switch C34 are respectively provided with two adjusting gears of 0-1A and 0-5A.
The protection device to be verified of the direct current power supply 1 provides an external auxiliary power supply of 220V.
In an embodiment, the voltage range of the one path of variable alternating current voltage source is 0-400V, when a voltage amount of 0-400V is provided for the device to be verified to perform voltage verification on the protection device, the device to be verified can be connected with the voltage source, the voltage value is gradually increased to enable the device to be verified to perform protection action, the voltage value at the moment is read, and the voltage value at the moment is the action value of the device to be protected;
an embodiment of the verification method for the verification device of the relay protection device includes the following specific verification steps:
the method comprises the following steps: connecting the calibration device with a corresponding interface of the relay protection device, and connecting a grounding wire of the calibration device with a grounding point of the relay protection device;
step two: connecting a protection node action indicating lamp group 39 on the verification device with an action node of the protection device to be verified through a protection device action node action indicating lamp group port;
the specific display conditions of the protection node action indicating lamp group are as follows:
the checking device is a first group of wiring terminals of the port of the protective device action node action indicating lamp group through a protective device action node wiring terminal 11 and a protective device action node wiring terminal 12, the 11-12 wiring terminals are connected with an action node of the protected device, and after the protected device acts, a node signal is transmitted to a first node indicating lamp 8 to display the node action;
the checking device is a second group of wiring terminals of the port of the action node action indicating lamp group of the protection device through a protection device action node wiring terminal 13 and a protection device action node wiring terminal 14, the 13-14 wiring terminals are connected with an action node of the protected device, and after the protected device acts, a node signal is transmitted to a second node indicating lamp 7 to display the node action;
the checking device is a third group of wiring terminals of a protection device action node action indicating lamp group port through a protection device action node wiring terminal 15 and a protection device action node wiring terminal 16, the 15-16 wiring terminals are connected with an action node of the protected device, and after the protected device acts, a node signal is transmitted to a third node indicating lamp 6 to display the node action;
the checking device is a fourth group of terminals of the protective device action node action indicating lamp group port through a protective device action node terminal 17 and a protective device action node terminal 18, the 17-18 terminals are connected with an action node of the protected device, and when the protected device acts, a node signal is transmitted to a fourth node indicating lamp 5 to display the node action;
the checking device is a fifth group of terminals of the protective device action node action indicator lamp group port through a protective device action node terminal 19 and a protective device action node terminal 20, the 19-20 terminals are connected with the action node of the protected device, and when the protected device acts, a node signal is transmitted to a fifth node indicator lamp 8 to display the node action;
connecting one path of variable alternating current voltage source 3 in the checking device with a variable voltage input end of a protection device to be checked through a first group of connecting ends at the input end of the protection device; the first set of link of protection device input includes: a protection device input first set of connection terminals 21 and a protection device input first set of connection terminals 22;
connecting a three-way variable alternating current power supply 2 in the checking device with a variable current input end of a protection device to be checked, and connecting the three-way variable alternating current power supply with a second group of connecting ends of the input end of the protection device, a third group of connecting ends of the input end of the protection device and a fourth group of connecting ends of the input end of the protection device;
the protection device input end second group link includes: a second set of connection terminals 23 at the input of the protection device and a second set of connection terminals 24 at the input of the protection device;
protection device input third group link includes: a third set of connection terminals 25 at the input of the protection device and a third set of connection terminals 26 at the input of the protection device;
the fourth group of connecting ends of the input end of the protection device comprises: a protection device input end fourth group connecting terminal 27 and a protection device input end fourth group connecting terminal 28;
the second group of connecting ends of the input end of the protection device can bear the alternating voltage of 0-400V of the protection device;
will dc power source end 1 of calibration equipment passes through calibration equipment dc power port with the protection device auxiliary power that waits to check-up and is connected, calibration equipment dc power port includes: a verifying device dc power supply terminal 29, a verifying device dc power supply terminal 30;
step three: closing the air switch 31 at the DC power end to electrify the protection device to be tested; the three-way variable alternating current source selection switch A32, the three-way variable alternating current source selection switch B33 and the three-way variable alternating current source selection switch C34 are closed, and an input current module of the protection device to be verified is electrified; rotating the variable AC current source knob 38 to adjust the magnitude of the input current;
the three-way variable alternating current source selection switch A32 can select the measuring range of the branch alternating current source to be 1A or 5A;
the three-way variable alternating current source selection switch B33 can select the measuring range of the branch alternating current source to be 1A or 5A;
the three-way variable alternating current source selection switch C34 can select the measuring range of the branch alternating current source to be 1A or 5A;
and if the input current reaches the rated value of the protection device, the corresponding lamp in the five node indicator lamps of the verification device is on, the relevant current value is recorded, and the current verification is finished.
Step four: closing one path of variable alternating current voltage source air switch 35, and electrifying an input voltage module of the protection device to be verified; the variable ac voltage source air switch 35 controls the input and output of the auxiliary power supply of the protection device.
Rotating a variable alternating current voltage source knob 40, adjusting the input voltage, if the input voltage reaches the rated value of the protection device, lighting five node indicator lamps of the verification device, recording related voltage values, and finishing voltage verification;
step four: and after the verification test is finished, disconnecting the air switch at the direct current power supply end, the three paths of variable alternating current source switches and the one path of variable alternating current source air switch in the verification device, and disconnecting the connection line between the verification device and the protection device.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (7)
1. A calibration device for a relay protection device, comprising: the device comprises a direct current power supply, three variable alternating current sources, one variable alternating current source, a to-be-verified protection device wiring port group, a switch assembly, a variable alternating current source knob, a protection node action indicating lamp group, a variable alternating voltage knob, a grounding port, a grounding wire and a plurality of follow wires;
the alternating current power supply, the three variable alternating current sources and the one variable alternating current voltage source are respectively connected with a configuration port of a wiring port group of the protection device to be verified;
the variable alternating current source knob is connected with the three paths of variable alternating current sources;
the variable alternating voltage knob is connected with a variable alternating voltage source;
the protection node action indicator lamp group is respectively connected with a configuration port of a wiring port group of the protection device to be verified;
the ground port is connected with a configuration port of a wiring port group of the protection device to be verified through a ground wire;
the switch button assembly includes: the system comprises a three-way variable alternating current source selection switch A, a three-way variable alternating current source selection switch B, a three-way variable alternating current source selection switch C, an alternating current source end air switch and a one-way variable alternating current source air switch;
the variable alternating current voltage source air switch is connected with a variable alternating current voltage source through a lead;
the three-way variable alternating current source selection switch A, the three-way variable alternating current source selection switch B and the three-way variable alternating current source selection switch C are respectively connected with the three-way variable alternating current source in parallel through conducting wires;
and the air switch of the direct current power supply end is connected with a direct current power supply through a lead.
2. A calibration device for a relay protection device according to claim 1, wherein: the port group of the wiring of the protection device to be verified comprises: the device comprises a to-be-verified protection device variable voltage input port, a to-be-verified protection device variable current input port, a to-be-verified protection device auxiliary power supply port, a protection device action node action indicating lamp group port and a to-be-verified protection device grounding port;
the one-path variable alternating current voltage source is connected with a variable voltage input port of the protection device to be verified;
the three paths of variable alternating current voltage sources are connected with a variable current input port of the protection device to be verified;
the direct current power supply is connected with an auxiliary power supply port of the protection device to be verified;
the protection node action indicating lamp group is connected with a port of the protection device action node action indicating lamp group; the protection device action node action indicating lamp group port further comprises: the protection device comprises a first group of protection device action node wiring terminals, a second group of protection device action node wiring terminals, a third group of protection device action node wiring terminals, a fourth group of protection device action node wiring terminals and a fifth group of protection device action node wiring terminals;
and the grounding port is connected with the grounding port of the protection device to be verified.
3. A calibration device for a relay protection device according to claim 2, wherein: the protection node action indicating lamp group comprises: the system comprises a first node indicator light, a second node indicator light, a third node indicator light, a fourth node indicator light and a fifth node indicator light; the first node indicator lamp is connected with the first group of protection device action node wiring terminals, the second node indicator lamp is connected with the second group of protection device action node wiring terminals, the third node indicator lamp is connected with the third group of protection device action node wiring terminals, and the fourth node indicator lamp is connected with the fourth group of protection device action node wiring terminals, the fifth node indicator lamp is connected with the fifth group of protection device action node wiring terminals.
4. A calibration device for a relay protection device according to claim 3, wherein: the current range of the three-way variable alternating current source is 0-1A and 0-5A.
5. The verification device for the relay protection device according to claim 4, wherein: the protection device to be verified of the direct current power supply provides a 220V external auxiliary power supply.
6. The verification device for the relay protection device according to claim 5, wherein: the voltage range of the variable alternating current voltage source is 0-400V.
7. A method for verifying a verification device for a relay protection device according to any one of claims 1 to 1, comprising the steps of:
the method comprises the following steps: connecting the calibration device with a corresponding interface of the relay protection device, and connecting a grounding wire of the calibration device with a grounding point of the relay protection device;
step two: connecting a protection node action indicating lamp group on the verification device with an action node of the protection device to be verified through a protection node action indicating lamp group port;
connecting one path of variable alternating current voltage source in the checking device with a variable voltage input end of a protection device to be checked; connecting three variable alternating current sources in the checking device with a variable current input end of a protection device to be checked, and connecting an alternating current source end of the checking device with an auxiliary power supply of the protection device to be checked;
step three: closing an air switch of an alternating current power supply end to electrify a protection device to be inspected; the three-way variable alternating current source selection switch A, the three-way variable alternating current source selection switch B and the three-way variable alternating current source selection switch C are closed, and an input current module of the protection device to be verified is electrified; rotating a variable alternating current power supply knob to adjust the magnitude of input current;
and if the input current reaches the rated value of the protection device, the corresponding lamp in the five node indicator lamps of the verification device is on, the relevant current value is recorded, and the current verification is finished.
Step four: closing one path of variable alternating current voltage source air switch, and electrifying an input voltage module of the protection device to be verified; rotating a variable alternating current voltage source knob, adjusting the input voltage, if the input voltage reaches the rated value of the protection device, lighting five node indicator lamps of the verification device, recording related voltage values, and finishing voltage verification;
step five: and after the verification test is finished, disconnecting the air switch at the direct current power supply end, the three paths of variable alternating current source switches and the one path of variable alternating current source air switch in the verification device, and disconnecting the connection line between the verification device and the protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010672864.3A CN111812437A (en) | 2020-07-14 | 2020-07-14 | Calibration device for relay protection device and calibration method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010672864.3A CN111812437A (en) | 2020-07-14 | 2020-07-14 | Calibration device for relay protection device and calibration method thereof |
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| CN111812437A true CN111812437A (en) | 2020-10-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089163A (en) * | 2021-11-23 | 2022-02-25 | 广东电网有限责任公司 | Equipment state detection circuit and equipment state detection device |
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2020
- 2020-07-14 CN CN202010672864.3A patent/CN111812437A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089163A (en) * | 2021-11-23 | 2022-02-25 | 广东电网有限责任公司 | Equipment state detection circuit and equipment state detection device |
| CN114089163B (en) * | 2021-11-23 | 2024-03-08 | 广东电网有限责任公司 | Equipment state detection circuit and equipment state detection device |
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