CN216013529U - Middle and low voltage lightning protection element test circuit - Google Patents
Middle and low voltage lightning protection element test circuit Download PDFInfo
- Publication number
- CN216013529U CN216013529U CN202121838738.7U CN202121838738U CN216013529U CN 216013529 U CN216013529 U CN 216013529U CN 202121838738 U CN202121838738 U CN 202121838738U CN 216013529 U CN216013529 U CN 216013529U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- resistor
- circuit
- main control
- lightning protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Protection Of Static Devices (AREA)
Abstract
The utility model relates to a middle and low voltage lightning protection element test circuit, which comprises: the display device comprises a main control circuit, a power supply control circuit and a display circuit, wherein the main control circuit is respectively and electrically connected with the power supply control circuit and the display circuit; the power supply control circuit is used for providing a stable power supply for the main control circuit, the main control circuit is used for collecting the current value flowing through the lightning protection element after the test voltage is applied to the tested lightning protection element and transmitting the current value to the display circuit, and the display circuit is used for displaying the current value. The middle-low voltage lightning protection element test circuit provided by the utility model realizes the test of the middle-low voltage lightning protection element by using a simpler circuit structure.
Description
Technical Field
The utility model relates to the technical field of lightning protection testing, in particular to a middle and low voltage lightning protection element testing circuit.
Background
The lightning protection element test equipment is generally applied to lightning arrester performance tests of lightning protection facilities such as telecommunication, electric power, meteorology, machine rooms, electric power distribution lines, iron tower transmission lines, gas stations, factory grounding grids and the like. The lightning arrester is used for protecting electrical equipment from being damaged by high transient overvoltage during lightning stroke, limiting follow current time and normally limiting follow current amplitude. Lightning arresters are sometimes also referred to as overvoltage protectors, overvoltage limiters. In the prior art, the circuit structure for testing the medium and low voltage lightning protection element is complex, so that the corresponding lightning protection element tester has high cost.
SUMMERY OF THE UTILITY MODEL
In view of the above, a need exists for a circuit for testing a medium/low voltage lightning protection device, which is used to solve the problem of complicated circuit structure in the prior art.
In order to solve the above problems, the utility model provides a middle and low voltage lightning protection element test circuit, which comprises a main control circuit, a power control circuit and a display circuit, wherein the main control circuit is respectively electrically connected with the power control circuit and the display circuit;
the power supply control circuit is used for providing a stable power supply for the main control circuit, the main control circuit is used for collecting the current value flowing through the lightning protection element after the test voltage is applied to the tested lightning protection element and transmitting the current value to the display circuit, and the display circuit is used for displaying the current value.
Further, the main control circuit comprises a main control chip IC5, a capacitor C16 and a capacitor C17, pins 20 and 40 of the main control chip IC5 are respectively connected with two ends of the capacitor C17, the capacitor C16 is connected with the capacitor C17 in parallel, one end of the capacitor C16 is grounded, and the other end of the capacitor C16 is connected with a direct-current power supply.
Further, the main control circuit further comprises a crystal oscillator CR1, a capacitor C18 and a capacitor C19, two ends of the crystal oscillator CR1 are respectively connected with pins 18 and 19 of the main control chip IC5, the pin 18 of the main control chip IC5 is also connected with one end of the capacitor C18, the other end of the capacitor C18 is connected with one end of the capacitor C19, and the other end of the capacitor C19 is connected with the pin 19 of the main control chip IC 5.
Furthermore, the power supply control circuit comprises a battery BATT, a switch SW1, a triode V6, a voltage stabilizer IC1-1, an IC-2, an IC-3 and a capacitor C7, wherein the negative electrode of the battery BATT is grounded, the positive electrode of the battery BATT is connected with the emitting electrode of the triode V6 through a switch SW1, the collector electrode of the triode V6 is simultaneously connected with 1 pin of the voltage stabilizers IC1-1, IC-2 and IC-3, and 3 pins of the voltage stabilizers IC1-1, IC-2 and IC-3 are grounded through a capacitor C7.
Furthermore, the power control circuit further comprises a resistor R11-R16, a resistor R18-1, a resistor R18-2, a resistor R18-3, a transistor V7, a diode V8, a diode V9 and a capacitor C3, wherein two ends of the resistor R11 are respectively connected with an emitter and a base of the transistor V6, an emitter of the transistor V6 is further connected with one end of the capacitor C3, the other end of the capacitor C3 is simultaneously connected with one end of a resistor R13, one end of a resistor R14 and a cathode of a diode V8, the other end of the resistor R13 is connected with a base of the transistor V7, the other end of the resistor R14 and an anode of the diode V8 are connected with an emitter of the transistor V7, a collector of the transistor V6 is connected with a base of the transistor V6 through the resistor R12, and pins 3 of the voltage regulators IC1-1, IC-2 and IC-3 are respectively connected through a resistor R18-1, The resistor R18-2 and the resistor R18-3 are connected with one end of the capacitor C7, and the other end of the capacitor C7 is grounded.
Furthermore, the display circuit comprises a display screen OCM12864-1, a capacitor C14 and a capacitor C15, pins 7 to 14 of the display circuit are respectively connected with pins P00 to P07 of the main control chip IC5, two ends of the capacitor C15 are respectively connected with pins 1 and 2 of the display screen OCM12864-1, and the capacitor 14 is connected with the capacitor C15 in parallel.
Further, the display circuit further comprises a diode V10, a triode V11, a triode V12, a resistor R19, a resistor R20 and a resistor R22, wherein a pin 20 of the display screen OCM12864-1 is connected with a collector of the triode V11, an emitter of the triode V11 is connected with a cathode of the diode V10, an anode of the diode V10 is connected with an anode of the diode V9 through the resistor R19, a base of the triode V11 is connected with a collector of the triode V12 through the resistor R20, an emitter of the triode V12 is grounded, and a base of the triode V12 is grounded through the resistor R22.
Furthermore, the middle and low voltage lightning protection element test circuit also comprises a communication circuit, the communication circuit comprises a communication chip IC9 and a resistor R8, and pins 2 and 3 of the communication chip IC9 are respectively connected with pins 12 and 13 of a main control chip IC 5.
Furthermore, the middle and low voltage lightning protection element test circuit further comprises a storage circuit, the storage circuit comprises a storage chip IC8, a capacitor C27, a capacitor C30 and a capacitor C31, pins 2 and 16 of the storage chip IC8 are respectively connected with two ends of the capacitor C27, pins 6 and 15 of the storage chip IC8 are respectively connected with two ends of the capacitor C30, pins 4 and 5 of the storage chip IC8 are respectively connected with two ends of the capacitor C31, and pins 9 and 10 of the storage chip IC8 are respectively connected with pins 1 and 4 of the communication chip IC 9.
Further, the middle and low voltage lightning protection element test circuit further comprises a power supply circuit, the power supply circuit comprises a resistor R24, a resistor R25, a capacitor C22-C24 and a sliding resistor RP3, a direct current power supply is connected with one end of the resistor R24, the other end of the resistor R24 is connected with a pin 2 of the main control chip IC5, the direct current power supply is grounded through a capacitor C22, the other end of the resistor R24 is connected with a pin 3 of the sliding resistor RP3, a pin 1 of the sliding resistor RP3 is grounded through a resistor R25, the other end of the resistor R24 is grounded through a capacitor C23, and the other end of the resistor R24 is grounded through a capacitor C24.
The beneficial effects of adopting the above embodiment are: the power supply control circuit provides a stable power supply for the main control circuit, the testing voltage is used for simulating the overvoltage of lightning protection, after the testing voltage is applied to the lightning protection element to be tested, the current value is generated in the lightning protection element to be tested, the main control circuit detects the current value flowing through the lightning protection element, the current value is displayed, and the current value is compared with the safety threshold range to determine whether the lightning protection element is qualified; the testing of the medium-low voltage lightning protection element is realized by utilizing a simpler circuit structure.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a middle and low voltage lightning protection device testing circuit provided by the present invention;
fig. 2 is a schematic circuit diagram of a main control circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a crystal oscillator unit according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a power control circuit according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a display circuit according to an embodiment of the present invention;
FIG. 6 is a circuit schematic of a communication circuit provided by an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of a memory circuit according to an embodiment of the present invention;
FIG. 8 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present invention;
fig. 9 is a schematic circuit diagram of a voltage divider according to an embodiment of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the utility model and together with the description, serve to explain the principles of the utility model and not to limit the scope of the utility model.
The embodiment of the utility model provides a middle and low voltage lightning protection element test circuit, which has a schematic structural diagram, as shown in fig. 1, the middle and low voltage lightning protection element test circuit comprises a main control circuit 1, a power supply control circuit 2 and a display circuit 3, wherein the main control circuit 1 is electrically connected with the power supply control circuit 2 and the display circuit 3 respectively;
the power supply control circuit 1 is used for providing a stable power supply for the main control circuit, the main control circuit 2 is used for collecting the current value flowing through the lightning protection element after the test voltage is applied to the tested lightning protection element, and transmitting the current value to the display circuit 3, and the display circuit 3 is used for displaying the current value.
It should be noted that, a stable power supply is provided for the main control circuit through the power control circuit, the overvoltage of lightning protection is simulated by using the test voltage, after the test voltage is applied to the lightning protection element to be tested, a current value is generated inside the lightning protection element to be tested, the current value is displayed by detecting the current value flowing through the lightning protection element, and whether the lightning protection element is qualified or not can be determined by comparing the current value with the safety threshold range.
As a preferred embodiment, the main control circuit includes a main control chip IC5, a capacitor C16 and a capacitor C17, pins 20 and 40 of the main control chip IC5 are respectively connected to two ends of the capacitor C17, the capacitor C16 is connected in parallel with the capacitor C17, one end of the capacitor C16 is grounded, and the other end of the capacitor C16 is connected to a dc power supply.
It should be noted that the pins 31 and 41 of the main control chip IC5 are used for receiving a dc power, and the capacitor C16 and the capacitor C17 are used for filtering the dc power.
In a specific embodiment, as shown in fig. 2, the main control chip may be a model ST 32103406.
As a preferred embodiment, the main control circuit further includes a crystal oscillator CR1, a capacitor C18, and a capacitor C19, two ends of the crystal oscillator CR1 are respectively connected to pins 18 and 19 of the main control chip IC5, pin 18 of the main control chip IC5 is further connected to one end of the capacitor C18, the other end of the capacitor C18 is connected to one end of the capacitor C19, and the other end of the capacitor C19 is connected to pin 19 of the main control chip IC 5.
The crystal oscillator CR1, the capacitor C18, and the capacitor C19 form a crystal oscillator unit, and a schematic circuit diagram of the crystal oscillator unit is shown in fig. 3; the crystal oscillator unit is used for generating the clock frequency necessary for the main control chip.
As a preferred embodiment, the power supply control circuit comprises a battery BATT, a switch SW1, a triode V6, voltage regulators IC1-1, IC-2 and IC-3 and a capacitor C7, wherein the negative electrode of the battery BATT is grounded, the positive electrode of the battery BATT is connected with the emitter of the triode V6 through a switch SW1, the collector of the triode V6 is simultaneously connected with pins 1 of the voltage regulators IC1-1, IC-2 and IC-3, and pins 3 of the voltage regulators IC1-1, IC-2 and IC-3 are grounded through a capacitor C7.
In a specific embodiment, as shown in fig. 4, the battery BATT is a power supply, and the power control circuit can provide a stable dc power supply for the main control circuit.
As a preferred embodiment, the power control circuit further includes resistors R11-R16, resistor R18-1, resistor R18-2, resistor R18-3, transistor V7, diode V8, diode V9 and capacitor C3, two ends of the resistor R11 are respectively connected to the emitter and the base of the transistor V6, the emitter of the transistor V6 is further connected to one end of the capacitor C3, the other end of the capacitor C3 is simultaneously connected to one end of the resistor R13, one end of the resistor R14 and the cathode of the diode V8, the other end of the resistor R13 is connected to the base of the transistor V7, the other end of the resistor R14 and the anode of the diode V8 are connected to the emitter of the transistor V7, the collector of the transistor V6 is connected to the base of the transistor V6 through resistor R12, and the pins of the voltage regulators IC1-1, IC-2 and IC-3 are respectively connected through resistors R18-1, The resistor R18-2 and the resistor R18-3 are connected with one end of the capacitor C7, and the other end of the capacitor C7 is grounded.
It should be noted that the power control circuit may also be connected to an external power source through a diode V1, and whether power is supplied to the main control circuit may be controlled through a switch SW1, so as to control the operating state of the main control circuit.
As a preferred embodiment, the display circuit includes a display screen OCM12864-1, a capacitor C14 and a capacitor C15, pins 7 to 14 of the display circuit are respectively connected with pins P00 to P07 of the main control chip IC5, two ends of the capacitor C15 are respectively connected with pins 1 and 2 of the display screen OCM12864-1, and the capacitor 14 is connected in parallel with the capacitor C15.
In one embodiment, the circuit schematic of the display circuit is as shown in fig. 5; the display screen OCM12864-1 is an LCD liquid crystal display screen, and a user can know the current value flowing through the lightning protection element through the display screen.
As a preferred embodiment, the display circuit further includes a diode V10, a transistor V11, a transistor V12, a resistor R19, a resistor R20, and a resistor R22, wherein a pin 20 of the display panel OCM12864-1 is connected to a collector of the transistor V11, an emitter of the transistor V11 is connected to a cathode of the diode V10, an anode of the diode V10 is connected to an anode of the diode V9 through the resistor R19, a base of the transistor V11 is connected to a collector of the transistor V12 through the resistor R20, an emitter of the transistor V12 is grounded, and a base of the transistor V12 is grounded through the resistor R22.
It should be noted that, the circuit composed of the diode V10, the triode V11, the triode V12, the resistor R19, the resistor R20, and the resistor R22 is a power supply circuit of the display screen, the dc power supply is connected to the anode of the diode V10 through the resistor R19, the emitter of the triode V11 is connected to the cathode of the diode V10, and the 20 pins of the display screen OCM12864-1 are connected to the collector of the triode V11.
As a preferred embodiment, the middle and low voltage lightning protection element test circuit further includes a communication circuit, the communication circuit includes a communication chip IC9 and a resistor R8, and pins 2 and 3 of the communication chip IC9 are connected to pins 12 and 13 of the main control chip IC5, respectively.
It should be noted that the communication circuit is used for communication, and the current value number in the lightning protection element to be tested is transmitted to the main control circuit through the communication circuit.
In one embodiment, a circuit schematic of the communication circuit is shown in fig. 6; the model of the communication chip is MAX485CPA, and an RS485 interface in the figure 6 is connected with the lightning protection element to be tested.
As a preferred embodiment, the middle and low voltage lightning protection element test circuit further includes a memory circuit, the memory circuit includes a memory chip IC8, a capacitor C27, a capacitor C30 and a capacitor C31, pins 2 and 16 of the memory chip IC8 are respectively connected to two ends of the capacitor C27, pins 6 and 15 of the memory chip IC8 are respectively connected to two ends of the capacitor C30, pins 4 and 5 of the memory chip IC8 are respectively connected to two ends of the capacitor C31, and pins 9 and 10 of the memory chip IC8 are respectively connected to pins 1 and 4 of the communication chip IC 9.
In a specific embodiment, the memory circuit is a schematic circuit diagram, as shown in fig. 7, connected to the communication circuit, and the memory circuit can store current value data.
As a preferred embodiment, the middle and low voltage lightning protection element test circuit further includes a power supply circuit, the power supply circuit includes a resistor R24, a resistor R25, capacitors C22-C24, and a sliding resistor RP3, a dc power supply is connected to one end of the resistor R24, the other end of the resistor R24 is connected to the 2 pin of the main control chip IC5, the dc power supply is further grounded through a capacitor C22, the other end of the resistor R24 is connected to the 3 pin of the sliding resistor RP3, the 1 pin of the sliding resistor RP3 is grounded through a resistor R25, the other end of the resistor R24 is grounded through a capacitor C23, and the other end of the resistor R24 is also grounded through a capacitor C24.
In a specific embodiment, a schematic circuit diagram of the power supply circuit is shown in fig. 8; the power supply circuit and the power supply control circuit jointly supply power to the main control circuit, and the power supply circuit is connected with a P11 pin of the main control chip IC 5.
In another embodiment, a high-voltage control circuit is arranged between the lightning protection element to be tested and the communication circuit, and the high-voltage control circuit is used for voltage limiting protection. A0.75/1000 voltage divider composed of resistors is sampled to obtain a test voltage, and the test voltage is applied to a tested element. The circuit schematic of the voltage divider is shown in fig. 9.
The utility model discloses a middle and low voltage lightning protection element test circuit, which provides a stable power supply for a main control circuit through a power supply control circuit, uses test voltage to simulate overvoltage of lightning protection, applies the test voltage to a tested lightning protection element, and then has a current value inside the tested lightning protection element; the testing of the medium-low voltage lightning protection element is realized by utilizing a simpler circuit structure.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A middle and low voltage lightning protection element test circuit is characterized by comprising a main control circuit, a power supply control circuit and a display circuit, wherein the main control circuit is respectively and electrically connected with the power supply control circuit and the display circuit;
the power supply control circuit is used for providing a stable power supply for the main control circuit, the main control circuit is used for collecting the current value flowing through the lightning protection element after the test voltage is applied to the tested lightning protection element and transmitting the current value to the display circuit, and the display circuit is used for displaying the current value.
2. The middle and low voltage lightning protection element test circuit according to claim 1, wherein the main control circuit comprises a main control chip IC5, a capacitor C16 and a capacitor C17, pins 20 and 40 of the main control chip IC5 are respectively connected with two ends of a capacitor C17, the capacitor C16 is connected with the capacitor C17 in parallel, one end of the capacitor C16 is connected with ground, and the other end of the capacitor C16 is connected with a direct current power supply.
3. The middle and low voltage lightning protection element test circuit according to claim 2, wherein the main control circuit further comprises a crystal oscillator CR1, a capacitor C18 and a capacitor C19, two ends of the crystal oscillator CR1 are respectively connected to pins 18 and 19 of the main control chip IC5, pin 18 of the main control chip IC5 is further connected to one end of the capacitor C18, the other end of the capacitor C18 is connected to one end of the capacitor C19, and the other end of the capacitor C19 is connected to pin 19 of the main control chip IC 5.
4. The middle and low voltage lightning protection element test circuit according to claim 2, wherein the power control circuit comprises a battery BATT, a switch SW1, a triode V6, a voltage stabilizer IC1-1, an IC-2, an IC-3 and a capacitor C7, the negative electrode of the battery BATT is grounded, the positive electrode of the battery BATT is connected with the emitter of the triode V6 through a switch SW1, the collector of the triode V6 is simultaneously connected with 1 pin of the voltage stabilizers IC1-1, IC-2 and IC-3, and 3 pins of the voltage stabilizers IC1-1, IC-2 and IC-3 are grounded through a capacitor C7.
5. The medium and low voltage lightning protection element test circuit according to claim 4, wherein the power control circuit further comprises a resistor R11-R16, a resistor R18-1, a resistor R18-2, a resistor R18-3, a transistor V7, a diode V8, a diode V9 and a capacitor C3, two ends of the resistor R11 are respectively connected with an emitter and a base of the transistor V6, an emitter of the transistor V6 is further connected with one end of the capacitor C3, the other end of the capacitor C3 is simultaneously connected with one end of the resistor R13, one end of the resistor R14, a cathode of the diode V8, the other end of the resistor R13 is connected with a base of the transistor V7, the other end of the resistor R14 and an anode of the diode V8 are connected with an emitter of the transistor V7, a collector of the transistor V6 is connected with a base of the transistor V6 through a resistor R12, and the IC1-1, IC-2, and the IC-2-1 and the IC-2, The 3 pins of the IC-3 are respectively connected with one end of a capacitor C7 through a resistor R18-1, a resistor R18-2 and a resistor R18-3, and the other end of the capacitor C7 is grounded.
6. The middle and low voltage lightning protection element test circuit according to claim 5, wherein the display circuit comprises a display screen OCM12864-1, a capacitor C14 and a capacitor C15, pins 7 to 14 of the display circuit are respectively connected with pins P00 to P07 of the main control chip IC5, two ends of the capacitor C15 are respectively connected with pins 1 and 2 of the display screen OCM12864-1, and the capacitor 14 is connected in parallel with the capacitor C15.
7. The medium and low voltage lightning protection element test circuit according to claim 6, wherein the display circuit further comprises a diode V10, a transistor V11, a transistor V12, a resistor R19, a resistor R20 and a resistor R22, wherein 20 pins of the display panel OCM12864-1 are connected to a collector of the transistor V11, an emitter of the transistor V11 is connected to a cathode of the diode V10, an anode of the diode V10 is connected to an anode of the diode V9 through the resistor R19, a base of the transistor V11 is connected to a collector of the transistor V12 through the resistor R20, an emitter of the transistor V12 is grounded, and a base of the transistor V12 is grounded through the resistor R22.
8. The middle and low voltage lightning protection element test circuit according to claim 2, further comprising a communication circuit, wherein the communication circuit comprises a communication chip IC9 and a resistor R8, and pins 2 and 3 of the communication chip IC9 are connected with pins 12 and 13 of a main control chip IC5, respectively.
9. The middle and low voltage lightning protection element test circuit according to claim 8, further comprising a memory circuit, wherein the memory circuit comprises a memory chip IC8, a capacitor C27, a capacitor C30 and a capacitor C31, pins 2 and 16 of the memory chip IC8 are respectively connected to two ends of the capacitor C27, pins 6 and 15 of the memory chip IC8 are respectively connected to two ends of the capacitor C30, pins 4 and 5 of the memory chip IC8 are respectively connected to two ends of the capacitor C31, and pins 9 and 10 of the memory chip IC8 are respectively connected to pins 1 and 4 of the communication chip IC 9.
10. The middle and low voltage lightning protection element test circuit according to claim 2, further comprising a power supply circuit, wherein the power supply circuit comprises a resistor R24, a resistor R25, capacitors C22-C24, and a sliding resistor RP3, a DC power supply is connected to one end of the resistor R24, the other end of the resistor R24 is connected to the 2 pin of the main control chip IC5, the DC power supply is further connected to the ground through a capacitor C22, the other end of the resistor R24 is connected to the 3 pin of the sliding resistor RP3, the 1 pin of the sliding resistor RP3 is connected to the ground through the resistor R25, the other end of the resistor R24 is connected to the ground through a capacitor C23, and the other end of the resistor R24 is connected to the ground through a capacitor C24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121838738.7U CN216013529U (en) | 2021-08-06 | 2021-08-06 | Middle and low voltage lightning protection element test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121838738.7U CN216013529U (en) | 2021-08-06 | 2021-08-06 | Middle and low voltage lightning protection element test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216013529U true CN216013529U (en) | 2022-03-11 |
Family
ID=80527166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121838738.7U Active CN216013529U (en) | 2021-08-06 | 2021-08-06 | Middle and low voltage lightning protection element test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216013529U (en) |
-
2021
- 2021-08-06 CN CN202121838738.7U patent/CN216013529U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110045208A (en) | It is a kind of for quickly detecting the fexible unit and method of electric connector | |
| CN201903637U (en) | Checking instrument for monitoring discharge counter on line | |
| CN216013529U (en) | Middle and low voltage lightning protection element test circuit | |
| CN207937500U (en) | A kind of touch screen type multimeter | |
| CN109085483A (en) | A kind of high frequency attenuation oscillatory surge voltage generation circuit | |
| CN116359659B (en) | Portable electromagnetic compatibility testing equipment based on carrier communication unit and testing method thereof | |
| CN109212358B (en) | Method for simulating electromagnetic interference generated by ground potential rise of transformer substation | |
| CN208607346U (en) | A kind of superfrequency Partial discharge signal simulator with over-voltage measurement function | |
| CN208621717U (en) | One kind is for state of insulation experimental rig under power equipment high frequency attenuation oscillating voltage | |
| CN207020295U (en) | A kind of insulating check device and insulating check instrument | |
| CN214895504U (en) | Novel live-line detection device of lightning arrester online monitor | |
| CN104124678A (en) | Lightning-protection isolator and lightning-protection isolating circuit | |
| CN213689784U (en) | Built-in direct current arrester on-line monitoring appearance | |
| CN206531878U (en) | A kind of circuit power frequency parameter experiment termination | |
| CN219179498U (en) | Insulation resistance tester for shielding induced voltage | |
| CN205280920U (en) | Intelligent ammeter voltage shake simulation tests machine | |
| CN110361616A (en) | Arrester based on Internet of Things monitors platform on-line | |
| CN209231453U (en) | A kind of superfrequency hand-held steep-sided pulse generator applied to the test of GIS partial discharge | |
| CN206696329U (en) | Multifunction instrument detecting system | |
| CN211955720U (en) | Test circuit for verifying lightning protection capability of signal surge protector | |
| CN204945282U (en) | A kind of system ensemble being applicable to multiple lightning protection component Characteristics Detection | |
| CN212391555U (en) | Testing device of direct current electroscope | |
| CN108008226A (en) | Zinc-Oxide Arrester safe wireless tester | |
| CN205027834U (en) | Portable multi -functional lightning protection tester | |
| CN202649309U (en) | Direct current resistance test system of power transmission line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |