Online and tripped dual indicators of surge protector and surge protector

Abstract

The invention discloses an online and tripping dual indicator of a surge protector and a surge protector. The indicator comprises an online output circuit for realizing online output of the surge protector, a tripping protection circuit for performing tripping protection on the surge protector, an online indicating circuit for online indicating of the surge protector, a failure indicating circuit for indicating failure of the surge protector, an overcurrent and overheating protection circuit for overcurrent and overheating protection of the surge protector, and a unidirectional isolation circuit for unidirectional isolation of the failure indicating circuit. The online output circuit, the tripping protection circuit, and the online indicating circuit are connected in parallel, and one end is connected to the input end of the indicator via the overcurrent and overheating protection circuit, and the other end is connected to the output end of the indicator. The failure indicating circuit is connected between the input end and the output end of the indicator. The output end of the overcurrent and overheating protection circuit is connected to the failure indicating circuit via the unidirectional isolation circuit. The invention can monitor whether the surge protector is tripped and whether it is online, and provide basic information for online monitoring of the surge protector.

Description

Technical Field

[0001] The invention relates to an indicator and a surge protector installed with the indicator, in particular to an online and tripping double indicator of the surge protector and the surge protector. Background Art

[0002] In the daily monitoring of surge protectors, the main tasks include observing whether the surge protector is operating online and whether the surge protector is tripped. Online operation is usually verified by observing the backup switch of the surge protector and using a test pen, and whether it is tripped is mainly judged by observing the trip indicator and measuring the remote signal on and off.

[0003] The patent number is: ZL2014106518122, and the patent name is: "A surge and a double-trip pluggable surge protector with no leakage current". A double-trip structure is disclosed, in which tripping mechanisms are respectively set on the two electrodes of the nonlinear element of the surge protector (including the varistor MOV and the discharge gap GAP), namely, a thermal melt tripping mechanism made of a temperature fuse and a mechanical tripping mechanism melted by low-temperature solder, and an indication of the mechanical tripping mechanism is set, but the original mechanical indication can only reflect the state of the mechanical tripping mechanism of the surge protector, and cannot reflect whether the surge protector is working online. Summary of the invention

[0004] The purpose of the present invention is to provide an online and tripping dual indicator of a surge protector and a surge protector, which can not only monitor whether the surge protector is tripped, but also monitor whether the surge protector is online, which is beneficial to daily monitoring of the surge protector and providing monitoring data.

[0005] The present invention is implemented by the following technical scheme: an online and tripping dual indicator of a surge protector, comprising an online output circuit for realizing online output of the surge protector, a tripping protection circuit for performing tripping protection on the surge protector, an online indicating circuit for online indicating of the surge protector, a failure indicating circuit for indicating failure of the surge protector, an overcurrent and overheating protection circuit for overcurrent and overheating protection of the surge protector, and a unidirectional isolation circuit for unidirectionally isolating the failure indicating circuit; the online output circuit, the tripping protection circuit, and the online indicating circuit are connected in parallel, and one end is connected to the input end of the online and tripping dual indicator via the overcurrent and overheating protection circuit, and the other end is connected to the output end of the online and tripping dual indicator; the failure indicating circuit is connected between the input end and the output end of the online and tripping dual indicator; the input end of the unidirectional isolation circuit is connected to the output end of the overcurrent and overheating protection circuit, and the output end of the unidirectional isolation circuit is connected to the failure indicating circuit.

[0006] As a further improvement of the above scheme, the failure indication circuit includes a resistor R1, an indicator light LR, and a resistor R2 connected in series; the input end of the unidirectional isolation circuit 1 is connected to the output end of the overcurrent and overheating protection circuit, and the output end of the unidirectional isolation circuit 1 is connected between the indicator light LR and the resistor R2.

[0007] As a further improvement of the above solution, the overcurrent and overheat protection circuit is an overcurrent and overheat fuse F.

[0008] As a further improvement of the above solution, the online and tripping dual indicator also includes a DC power isolation circuit, and the online output circuit, the online indication circuit, and the failure indication circuit are all connected to the output end of the online and tripping dual indicator via the DC power isolation circuit.

[0009] As a further improvement of the above scheme, the online and tripped dual indicator also includes a unidirectional isolation circuit 2, the input end of the unidirectional isolation circuit 2 is connected to the input end of the online and tripped dual indicator, and the output end of the unidirectional isolation circuit 2 is connected to the input end of the failure indication circuit.

[0010] As a further improvement of the above scheme, the online and tripping dual indicator also includes a unidirectional isolation circuit three, the input end of the unidirectional isolation circuit three is connected to the output end of the overcurrent and overheat protection circuit, and the output end of the unidirectional isolation circuit three is connected to the input end of the online output circuit and the input end of the online indication circuit.

[0011] As a further improvement of the above solution, the tripping protection circuit includes a nonlinear element and a tripping mechanism connected in series.

[0012] As a further improvement of the above solution, the online indication circuit includes a resistor R3, an indicator light LB, and a resistor R4 connected in series.

[0013] As a further improvement of the above solution, the online output circuit includes a resistor R5 and an electronic switch connected in series.

[0014] The present invention also provides a surge protector equipped with any one of the above-mentioned online and tripping dual indicators.

[0015] The corresponding tripping mechanism of the present invention is different in that an electronic indication is provided to indicate the on and off of the backup temperature fuse and whether the surge protector is online, retains the original mechanical tripping indication, and forms a surge protector with dual indicator indications; it respectively indicates whether the temperature fuse is blown and tripped and whether the solder mechanical tripping is actuated and tripped, and at the same time monitors whether the surge protector is operating online. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a circuit functional structure diagram of the online and tripped dual indicators of the surge protector of the first embodiment.

[0017] Figure 2 for Figure 1 Circuit diagram of dual indicator for on-line and trip.

[0018] Figure 3 This is a circuit functional structure diagram of the online and tripped dual indicators of the surge protector of the second embodiment.

[0019] Figure 4 for Figure 3 Circuit diagram of dual indicator for on-line and trip.

[0020] Figure 5 This is a circuit functional structure diagram of the online and tripped dual indicators of the surge protector of the third embodiment.

[0021] Figure 6 for Figure 5 Circuit diagram of dual indicator for on-line and trip.

[0022] Figure 7 This is a circuit functional structure diagram of the online and tripped dual indicators of the surge protector of the fourth embodiment.

[0023] Figure 8 for Figure 7 Circuit diagram of dual indicator for on-line and trip. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Example 1

[0026] See also Figure 1 The online and tripping dual indicators of the surge protector of this embodiment include an online output circuit 1, a tripping protection circuit 2, an online indication circuit 3, a failure indication circuit 4, an overcurrent and overheating protection circuit 5, and a unidirectional isolation circuit 9. The online output circuit 1 is used to realize the online output of the surge protector. The tripping protection circuit 2 is used to perform tripping protection on the surge protector, the online indication circuit 3 is used to indicate the online state of the surge protector, the failure indication circuit 4 is used to indicate the failure of the surge protector, and the overcurrent and overheating protection circuit 5 provides overcurrent and overheating protection for the surge protector. The unidirectional isolation circuit 9 performs unidirectional isolation on the failure indication circuit 4. The input end of the online and tripping dual indicators can be connected to the L line of the power distribution system, and the output end of the online and tripping dual indicators can be connected to the N / PE line of the power distribution system.

[0027] The online output circuit 1, the tripping protection circuit 2, and the online indication circuit 3 are connected in parallel, and one end is connected to the input end of the online and tripping dual indicator via the overcurrent and overheat protection circuit 5, and the other end is connected to the output end of the online and tripping dual indicator. The failure indication circuit 4 is connected between the input end and the output end of the online and tripping dual indicator. The input end of the unidirectional isolation circuit 9 is connected to the output end of the overcurrent and overheat protection circuit 5, and the output end of the unidirectional isolation circuit 9 is connected to the failure indication circuit 4.

[0028] Please combine Figure 2 , the overcurrent and overheating insurance F and the mechanical tripping mechanism J are dual tripping devices implemented by ZL2014106518122. When designing the online and tripping dual indicators of this embodiment, the overcurrent and overheating protection circuit 5 can be a temperature insurance F. The tripping protection circuit 2 includes a nonlinear element and a tripping mechanism connected in series. The nonlinear element can be a varistor MOV, and the tripping mechanism can be a mechanical tripping mechanism. The heat conduction of the varistor MOV disconnects the mechanical tripping mechanism to achieve the tripping of the surge protector. The failure indication circuit 4 includes a resistor R1, an indicator light LR, and a resistor R2 connected in series. The input end of the unidirectional isolation circuit 9 is connected to the output end of the overcurrent and overheating protection circuit 5, and the output end of the unidirectional isolation circuit 9 is connected between the indicator light LR and the resistor R2. The online indication circuit 3 includes a resistor R3, an indicator light LB, and a resistor R4 connected in series. The online output circuit 1 includes a resistor R5 and an electronic switch connected in series. The electronic switch can be a solid-state relay SW, one end of the resistor R5 is connected to the output end of the overcurrent and overheat protection circuit 5, the other end of the resistor R5 is connected to the anode of the light-emitting diode of the solid-state relay SW, and the cathode of the light-emitting diode of the solid-state relay SW is connected to the output end of the online and tripping dual indicators. The unidirectional isolation circuit 9 can be a diode D3, the anode of the diode D3 is connected to the output end of the overcurrent and overheat protection circuit 5, and the cathode of the diode D3 is connected between the indicator light LR and the resistor R2.

[0029] The implementation principle of the online and tripped dual indicators of this embodiment is as follows.

[0030] 1. Overcurrent and overheat fuse F, varistor MOV and mechanical tripping mechanism J can form the main discharge circuit of the surge protector.

[0031] 2. Resistor R3, indicator light LB and resistor R4 can form an online indication circuit. When the overcurrent and overheat fuse F is normal and the power supply is normal, the indicator light LB lights up green.

[0032] 3. Resistor R1, indicator light LR and resistor R2 can form a failure indication circuit. When the overcurrent and overheating fuse F is disconnected, the indicator light LR lights up red. When the overcurrent and overheating fuse F is normal, due to the action of diode D3, the potential difference between point A and point B is not enough to turn on the indicator light LR. Point A is at the input terminal A of the online and tripping dual indicator, and point B is between the indicator light LB and resistor R2B.

[0033] 4. Resistor R5 and solid-state relay SW form an online output circuit. When the surge protector is not online or when the overcurrent and overheat fuse F is disconnected, the solid-state relay SW is in a closed state. Otherwise, the pulse output can be detected through the peripheral circuit.

[0034] The online and tripping dual indicator of the present invention is provided with an online indication circuit 3 and a failure indication circuit 4, wherein the online indication circuit 3 indicates whether the overcurrent and overheat protection circuit 5 and the surge protector are online, and the tripping indication of the tripping protection circuit 2 is retained, thus forming an online and tripping dual indicator indicated by a dual indicator.

[0035] During on-site testing, the online indication circuit 3 can not only directly indicate whether the surge protector is normal, but also directly judge whether the surge protector is online by the light of the indicator light LB of the online indication circuit 3. In addition, the electronic switch, i.e., the solid-state relay SW, can be used to remotely monitor whether the surge protector is online.

[0036] Example 2

[0037] See also Figure 3 The online and tripping dual indicator of this embodiment and the online and tripping dual indicator of Embodiment 1 have basically the same structure, and the difference is that the online and tripping dual indicator of this embodiment further includes a DC power isolation circuit 6. The online output circuit 1, the online indication circuit 3, and the failure indication circuit 4 are all connected to the output end of the online and tripping dual indicator via the DC power isolation circuit 6.

[0038] Please combine Figure 4 In this embodiment, the DC power supply isolation circuit 6 uses a capacitor C1, and the capacitor C1 is used to isolate the DC power supply so that the leakage current of the surge protector is not affected by the peripheral circuit when testing the leakage current of the surge protector.

[0039] The implementation principle of the online and tripped dual indicators of this embodiment is as follows.

[0040] 1. Overcurrent and overheat fuse F, varistor MOV and mechanical tripping mechanism J can form the main discharge circuit of the surge protector.

[0041] 2. Resistor R3, indicator light LB, resistor R4 and capacitor C1 can form an online indication circuit. When the overcurrent and overheat fuse F is normal and the power supply is normal, the indicator light LB lights up green.

[0042] 3. Resistor R1, indicator light LR, resistor R2 and capacitor C1 can form a failure indication circuit. When the overcurrent and overheating fuse F is disconnected, the indicator light LR lights up red. When the overcurrent and overheating fuse F is normal, due to the action of diode D3, the potential difference between point A and point B is not enough to turn on the indicator light LR. Point A is at the input terminal A of the online and tripping dual indicator, and point B is between the indicator light LB and resistor R2B.

[0043] 4. Resistor R5, solid-state relay SW, and C1 form an online output circuit. When the surge protector is not online or when the overcurrent and overheat fuse F is disconnected, the solid-state relay SW is in a closed state. Otherwise, the pulse output can be detected through the peripheral circuit.

[0044] Example 3

[0045] See also Figure 5 The online and tripping dual indicator of this embodiment and the online and tripping dual indicator of embodiment 2 have basically the same structure, and the difference is that the online and tripping dual indicator of this embodiment further includes a unidirectional isolation circuit 2 7. The input end of the unidirectional isolation circuit 2 7 is connected to the input end of the online and tripping dual indicator, and the output end of the unidirectional isolation circuit 2 7 is connected to the input end of the failure indication circuit 4.

[0046] Please combine Figure 6 In this embodiment, the unidirectional isolation circuit 2 7 uses a diode D1, and the diode D1 plays a unidirectional isolation role of the power supply of the failure indication circuit 4.

[0047] The implementation principle of the online and tripped dual indicators of this embodiment is as follows.

[0048] 1. Overcurrent and overheat fuse F, varistor MOV and mechanical tripping mechanism J can form the main discharge circuit of the surge protector.

[0049] 2. Resistor R3, indicator light LB, resistor R4 and capacitor C1 can form an online indication circuit. When the overcurrent and overheat fuse F is normal and the power supply is normal, the indicator light LB lights up green.

[0050] 3. Diode D1, resistor R1, indicator light LR, resistor R2, and capacitor C1 can form a failure indication circuit. When the overcurrent and overheating fuse F is disconnected, the indicator light LR lights up red. When the overcurrent and overheating fuse F is normal, due to the action of diode D3, the potential difference between point A and point B is not enough to turn on the indicator light LR. Among them, point A is at the input terminal A of the online and tripping dual indicator, and point B is between the indicator light LB and the resistor R2B.

[0051] 4. Resistor R5, solid-state relay SW, and C1 form an online output circuit. When the surge protector is not online or when the overcurrent and overheat fuse F is disconnected, the solid-state relay SW is in a closed state. Otherwise, the pulse output can be detected through the peripheral circuit.

[0052] The function of D1: When the surge protector is reversely connected to zero (ground), the solid-state relay SW is closed and the green light of the indicator LB is off. It plays an important role when the power supply is unidirectional.

[0053] Example 4

[0054] See also Figure 7 The online and tripping dual indicator of this embodiment and the online and tripping dual indicator of embodiment 3 are basically the same in structure, and the difference is that the online and tripping dual indicator of this embodiment further includes a unidirectional isolation circuit 3 8. The input end of the unidirectional isolation circuit 3 8 is connected to the output end of the overcurrent and overheat protection circuit 5, and the output end of the unidirectional isolation circuit 3 8 is connected to the input end of the online output circuit 1 and the input end of the online indication circuit 3.

[0055] Please combine Figure 8 In this embodiment, the unidirectional isolation circuit 3 8 uses a diode D2, and the diode D2 plays a unidirectional isolation role of the power supply of the online output circuit 1 and the online indication circuit 3.

[0056] The implementation principle of the online and tripped dual indicators of this embodiment is as follows.

[0057] 1. Overcurrent and overheat fuse F, varistor MOV and mechanical tripping mechanism J can form the main discharge circuit of the surge protector.

[0058] 2. The diode D2, the resistor R3, the indicator light LB, the resistor R4 and the capacitor C1 can form an online indication circuit. When the overcurrent and overheat fuse F is normal and the power supply is normal, the indicator light LB lights up green.

[0059] 3. The diode D1, the resistor R1, the indicator light LR, the resistor R2 and the capacitor C1 can form a failure indication circuit. When the overcurrent and overheating fuse F is disconnected, the indicator light LR lights up red. When the overcurrent and overheating fuse F is normal, due to the action of the diode D3, the potential difference between point A and point B is not enough to turn on the indicator light LR. Among them, point A is at the input terminal A of the online and tripping dual indicator, and point B is between the indicator light LB and the resistor R2B.

[0060] 4. The diode D2, the resistor R5, the solid-state relay SW and C1 form an online output circuit. When the surge protector is not online or when the overcurrent and overheating fuse F is disconnected, the solid-state relay SW is in a closed state. Otherwise, the pulse output can be detected through the peripheral circuit.

[0061] The function of D1 and D2: when the surge protector is reversely connected to zero (ground), the solid-state relay SW is closed and the green indicator light is off, which plays an important role when the power supply is unidirectional.

[0062] For Example 4, according to Figure 8 , take resistance R1 = resistance R2 = resistance R3 = resistance R4 = 500KΩ, capacitor C1 = 0.1UF / 275V; indicator light LR = high-brightness red light-emitting diode, indicator light LB = high-brightness green light-emitting diode, make the electronic switch = solid-state relay SW, resistor R5 = 10KΩ.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An online and tripping dual indicator for a surge protector, comprising an online output circuit (1) for realizing online output of the surge protector, and a tripping protection circuit (2) for performing tripping protection on the surge protector; characterized in that: It also includes an online indication circuit (3) for indicating the online state of the surge protector, a failure indication circuit (4) for indicating the failure of the surge protector, an overcurrent and overheat protection circuit (5) for protecting the surge protector from overcurrent and overheat, and a unidirectional isolation circuit (9) for unidirectionally isolating the failure indication circuit (4); the online output circuit (1), the tripping protection circuit (2), and the online indication circuit (3) are connected in parallel, and one end is connected to the input end of the online and tripping dual indicator via the overcurrent and overheat protection circuit (5), and the other end is connected to the output end of the online and tripping dual indicator; The failure indication circuit (4) is connected between the input end and the output end of the online and tripping dual indicators; the input end of the unidirectional isolation circuit (9) is connected to the output end of the overcurrent and overheat protection circuit (5), and the output end of the unidirectional isolation circuit (9) is connected to the failure indication circuit (4); The failure indication circuit (4) comprises a resistor R1, an indicator light LR, and a resistor R2 connected in series; the input end of the unidirectional isolation circuit (9) is connected to the output end of the overcurrent and overheat protection circuit (5), and the output end of the unidirectional isolation circuit (9) is connected between the indicator light LR and the resistor R2; The online and tripping dual indicator further comprises a DC power isolation circuit (6); the online output circuit (1), the online indication circuit (3), and the failure indication circuit (4) are all connected to the output end of the online and tripping dual indicator via the DC power isolation circuit (6); The online indication circuit (3) comprises a resistor R3, an indicator light LB, and a resistor R4 connected in series; The unidirectional isolation circuit 1 (9) is a diode D3, and the DC power supply isolation circuit (6) is a capacitor C1.

2. The online and tripped dual indicator of the surge protector according to claim 1, characterized in that: The overcurrent and overheat protection circuit (5) is an overcurrent and overheat fuse F.

3. The online and tripped dual indicator of the surge protector according to claim 1, characterized in that: The online and tripping dual indicator further comprises a unidirectional isolation circuit 2 (7), the input end of the unidirectional isolation circuit 2 (7) being connected to the input end of the online and tripping dual indicator, and the output end of the unidirectional isolation circuit 2 (7) being connected to the input end of the failure indication circuit (4).

4. The online and tripped dual indicator of the surge protector according to claim 1, characterized in that: The online and tripping dual indicator further comprises a unidirectional isolation circuit three (8), the input end of the unidirectional isolation circuit three (8) being connected to the output end of the overcurrent and overheat protection circuit (5), and the output end of the unidirectional isolation circuit three (8) being connected to the input end of the online output circuit (1) and the input end of the online indication circuit (3).

5. The online and tripped dual indicator of the surge protector according to claim 1, characterized in that: The tripping protection circuit (2) comprises a nonlinear element and a tripping mechanism connected in series.

6. The online and tripped dual indicator of the surge protector according to claim 1, characterized in that: The online output circuit (1) comprises a resistor R5 and an electronic switch connected in series.

7. A surge protector equipped with an indicator, characterized in that: The indicator is an online and tripped dual indicator of the surge protector according to any one of claims 1 to 6.

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