Signal output inspection box for relay protection device

Abstract

The utility model belongs to the field of inspection boxes, and particularly relates to a relay protection device signal output inspection box which comprises an inspection box body, a plurality of first wire jacks, a plurality of indicator lamps, a common end wiring jack, a first resistor, a second resistor, a third resistor, a fourth resistor, a diode, a capacitor, a first triode and a second triode. The first end of the first resistor is sequentially connected with the diode and the capacitor, and the other end of the first resistor is sequentially connected with the second resistor and the capacitor; when the common terminal wiring jack is powered down, the high level of the detection port is pulled to the low level, an alarm signal is sent out, the detection port sends a signal to the indicating lamp, the indicating lamp receives a normal output signal and is green, and the indicating lamp receives the alarm signal and is red, so that the function of voltage detection is realized. The problem that the quality of electricity cannot meet the requirement is solved, and the adaptability of inspection work is improved.

Description

Technical Field

[0001] The utility model relates to the field of inspection boxes, in particular to a signal output inspection box for a relay protection device. Background Art

[0002] When debugging the relay protection device, when checking the output signal, it is necessary not only to check whether the corresponding contacts are reliably connected, but also to check whether the output contacts other than the signal are connected. For each protection action, all output contacts must be measured to check their on / off status.

[0003] Chinese patent number CN202320915337.X discloses a signal output inspection box for a relay protection device, which includes multiple rows of first wire jacks and indicator lights arranged vertically, the first wire jacks and indicator lights in each row are connected in series, and one end of the multiple rows of indicator lights is short-circuited and electrically connected to the battery and the common terminal wiring jack.

[0004] From the above, it can be seen that when the relay protection device is debugged and the output signal is output, the signal output inspection box of the relay protection device is used to monitor the output status of several output signals at the same time, which replaces the method of using a multimeter to continuously change the contact points for measurement. The status of all output signals can be checked through one wiring, and the work efficiency is greatly improved. However, this case still has the following shortcomings: when the wire jack circuit is unstable and a power outage occurs, the equipment indicator light can still light up normally, but the subsequent signal receiving equipment cannot work normally due to power outage, power loss, or the quality of the electricity does not meet the requirements.

[0005] Therefore, in view of the above problems, a relay protection device signal output inspection box is proposed. Utility Model Content

[0006] In order to make up for the shortcomings of the prior art and the problem that the quality of electricity does not meet the requirements, the utility model proposes a signal output inspection box for a relay protection device.

[0007] The technical solution adopted by the utility model to solve its technical problem is: a signal output inspection box of a relay protection device described in the utility model includes an inspection box, multiple first wire jacks, multiple indicator lights, a common terminal wiring jack, a first resistor, a second resistor, a third resistor, a fourth resistor, a diode, a capacitor, a first transistor, and a second transistor; the first end of the first resistor is connected to the diode and the capacitor in sequence, and the other end of the first resistor is connected to the second resistor and the capacitor in sequence.

[0008] Preferably, the common terminal wiring jack is connected to the base of the first transistor through a third resistor, and the collector of the first transistor is connected to the base of the second transistor through a fourth resistor.

[0009] Preferably, one end of the second resistor is connected to the first ground line.

[0010] Preferably, the emitter of the second transistor is connected to the second ground line.

[0011] Preferably, the collector of the second transistor is connected to the detection port and the indicator light.

[0012] The utility model is beneficial in that:

[0013] 1. Through the overall structural design, the utility model realizes that when the common terminal wiring jack loses power, the high level of the detection port will be pulled to a low level, an alarm signal will be issued, and the detection port sends a signal to the indicator light. The indicator light is green when it receives a normal signal and red when it receives an alarm signal. This is used as a judgment to realize the voltage detection function, solve the problem that the quality of electricity does not meet the requirements, and improve the adaptability of the inspection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 The utility model is a schematic diagram of the circuit principle of the inspection box structure.

[0017] In the figure: 1, inspection box; 2, first wire jack; VCC, common terminal wiring jack; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; D1, diode; C1, capacitor; Q1, first transistor; Q2, second transistor; L1, indicator light; GND1, first ground wire; GND2, second ground wire. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-Figure 2As shown, a signal output inspection box for a relay protection device includes an inspection box 1, a plurality of first wire jacks 2, a plurality of indicator lights L1, a common terminal wiring jack VCC, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode D1, a capacitor C1, a first transistor Q1, and a second transistor Q2; a first end of the first resistor R1 is connected to the diode D1 and the capacitor C1 in sequence, and the other end of the first resistor R1 is connected to the second resistor R2 and the capacitor C1 in sequence;

[0020] During operation, when the common terminal wiring jack VCC is connected to the first wire jack 2 and energized, the capacitor C1 is charged through the first resistor R1 and the diode D1. When the common terminal wiring jack VCC is stabilized at 12V, using the voltage divider ratio of the first resistor R1 and the second resistor R2, it is concluded that the left side of the diode D1 is 11.25V, which is reduced by a diode voltage drop after passing through the diode D1, that is, about 0.7V. Finally, the voltage of the capacitor C1 is charged to 10.55V.

[0021] Further, the common terminal wiring jack VCC is connected to the base of the first transistor Q1 through the third resistor R3, and the collector of the first transistor Q1 is connected to the base of the second transistor Q2 through the fourth resistor R4;

[0022] During operation, after the common terminal wiring jack VCC stabilizes at 12V, the collector of the first transistor Q1 is also 12V. Since the collector voltage of the first transistor Q1 is higher than the emitter voltage of the first transistor Q1, the first transistor Q1 is not conducting, and the base of the second transistor Q2 has no voltage, and the second transistor Q2 is also not conducting.

[0023] Furthermore, one end of the second resistor R2 is connected to the first ground line GND1;

[0024] During operation, when the common terminal wiring jack VCC drops to 9.85V, the voltage of the capacitor C1 is 10.55V when fully charged, which is 0.7V higher than the base of the first transistor Q1 (9.85V). Therefore, the first transistor Q1 is turned on, and the electricity of the capacitor C1 flows into the first ground line GND1 through the emitter base of the first transistor Q1, the third resistor R3, the first resistor R1, and the second resistor R2.

[0025] Furthermore, the emitter of the second transistor Q2 is connected to the second ground line GND2;

[0026] During operation, after the first transistor Q1 is turned on, the voltage of the capacitor C1 passes through the emitter-collector of the first transistor Q1, the fourth resistor R4, and the emitter-base of the second transistor Q2 to the ground, and the base voltage of the second transistor Q2 is 0.7V, so the second transistor Q2 is turned on.

[0027] Further, the collector of the second transistor Q2 is connected to the detection port and the indicator light L1;

[0028] During operation, after the second transistor Q2 is turned on, the external circuit voltage is pulled to the second ground line GND2, and the high level of the detection port is pulled to a low level. After the detection, the signal is transmitted to the indicator light L1 for execution.

[0029] Working principle: When the common terminal wiring jack VCC loses power and the power supply voltage drops to less than the capacitor voltage -0.7V, the first transistor Q1 will be turned on, and the electricity of the capacitor C1 will flow into the first ground wire GND1 through the emitter base of the first transistor Q1, the first resistor R1, the second resistor R2, and the third resistor R3. When the first transistor Q1 is turned on, part of the electricity of the capacitor will pass through R12, and the emitter base of the second transistor Q2 will flow into the second ground wire GND2. At this time, the second transistor Q2 will be turned on, and the high level of the detection port will be pulled to a low level, sending out an alarm signal. The detection port sends a signal to the indicator light L1. The indicator light L1 receives a normal opening signal as a green light, and receives an alarm signal as a red light, which is used as a judgment.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A relay protection device signal output inspection box, characterized in that: The invention comprises an inspection box (1), a plurality of first wire jacks (2), a plurality of indicator lights (L1), a common terminal wiring jack (VCC), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a diode (D1), a capacitor (C1), a first transistor (Q1), and a second transistor (Q2); a first end of the first resistor (R1) is connected to the diode (D1) and the capacitor (C1) in sequence, and the other end of the first resistor (R1) is connected to the second resistor (R2) and the capacitor (C1) in sequence.

2. A relay protection device signal output inspection box according to claim 1, characterized in that: The common terminal wiring jack (VCC) is connected to the base of the first transistor (Q1) through a third resistor (R3), and the collector of the first transistor (Q1) is connected to the base of the second transistor (Q2) through a fourth resistor (R4).

3. A relay protection device signal output inspection box according to claim 1, characterized in that: One end of the second resistor (R2) is connected to the first ground line (GND1).

4. A relay protection device signal output inspection box according to claim 1, characterized in that: The emitter of the second transistor (Q2) is connected to the second ground line (GND2).

5. The signal output inspection box for relay protection device according to claim 1, characterized in that: The collector of the second triode (Q2) is connected to the detection port and the indicator light (L1).

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