CN212180965U

CN212180965U - Test module for circuit detection

Info

Publication number: CN212180965U
Application number: CN202020339007.7U
Authority: CN
Inventors: 沈建位; 沈鑫刚; 陈罡; 郭德强
Original assignee: Ningbo Polytechnic
Current assignee: Ningbo Polytechnic
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-12-18
Anticipated expiration: 2030-03-18

Abstract

The utility model belongs to the high tension switchgear test field provides a test module for circuit detection for solve the problem that there is maloperation and inconvenient operation in the debugging process of the secondary circuit of the high tension switchgear through the active measurement of the universal meter, this high tension switchgear test module includes control circuit and control switch KK, still includes circuit detection unit XS, circuit detection unit XS includes circuit break-make measuring unit and voltage value measuring unit; the circuit on-off measuring unit is used for detecting the preset connection state of the control loop of the high-voltage switch cabinet; the voltage value measuring unit is used for measuring the voltage of the external circuit of the high-voltage switch cabinet; the circuit on-off unit and the voltage value measuring unit are electrically connected with the control circuit. This module can realize that external circuit's break-make is measured, voltage measurement and high-voltage live detection, improves experimental convenience and work efficiency effectively.

Description

Test module for circuit detection

Technical Field

The utility model belongs to the technical field of electrical equipment, concretely relates to test module for circuit detects.

Background

The high-voltage switch cabinet is important control and protection equipment of a power system, and plays an important role in safe and reliable operation of the power system. Therefore, the power system has high requirements on the reliability and strict quality control. Each product must be strictly tested according to relevant national and industrial standards to meet the requirements of design and standards before being available to users.

In the secondary circuit debugging of a high-voltage switch cabinet, when a circuit has a fault, the problem is generally searched by measuring circuit parameters by a universal meter at present, corresponding functional gears such as a resistance gear and a voltage gear are switched according to needs during the measurement of the universal meter, and a measurement result is checked through a meter head or a liquid crystal display screen. In the using process, gear conversion is troublesome, misoperation exists, and the multimeter can be damaged if voltage is measured during resistance gear; the display screen of the multimeter also has the problem of inconvenient viewing.

Therefore, a test module for circuit detection of a high-voltage switch cabinet without a universal meter needs to be designed, and the problems are solved.

Disclosure of Invention

The utility model aims to solve the technical problem to prior art's current situation, and provide an on-off measurement, the voltage measurement that can detect high tension switchgear control circuit to circuit on-off measurement and voltage measurement function can be according to outer circuit connection state and automatic switch's a test module that is used for the circuit to detect.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

a test module for circuit detection comprises a control circuit, a control switch KK and a circuit detection unit XS, wherein the circuit detection unit XS comprises a circuit on-off measurement unit and a voltage value measurement unit;

the circuit on-off measuring unit is used for detecting the preset connection state of the control loop of the high-voltage switch cabinet;

the voltage value measuring unit is used for measuring the voltage of the external circuit of the high-voltage switch cabinet;

the circuit on-off measuring unit and the voltage value measuring unit are electrically connected with the control circuit.

The circuit on-off measuring unit includes: a terminal X1, a terminal X2, a buzzer HA, a light emitting diode D3 and a third relay K3;

the voltage value measuring unit includes: a terminal X1, a terminal X3, a zener diode DX, a resistor RX, a capacitor CX, a first contact K31 of a third relay K3, a second contact K32 of the third relay K3, a voltmeter V including a V1 terminal, a V2 terminal, and a V3 terminal, a third switch S3, and the third switch S3 including a first contact S31 of a third switch S3 and a second contact S32 of a third switch S3;

in the on-off circuit measuring unit, the terminal X2 is connected with one end of a buzzer HA and the anode of a light-emitting diode D3, and the other end of the buzzer HA is connected with one end of a relay K3, the anode of a voltage stabilizing diode DX, the V3 end of a voltage meter head V and a terminal X1.

In the voltage value measuring unit, the terminal X3 is connected to one end of the first contact S31 and one end of the second contact S32 of the third switch S3, the other end of the first contact S31 is connected to one end of the first contact K31 of the third relay K3, the second contact K32 of the third relay K3 and one end of the capacitor CX, the other end of the first contact K31 of the third relay K3 is connected to one end of the V1 of the voltmeter V and the other end of the second contact S32 of the third switch S3, the other end of the second contact K32 of the third relay K3 is connected to one end of the V2 of the voltmeter V, the other end of the capacitor CX is connected to one end of the resistor RX, and the other end of the resistor RX is connected to the negative electrode of the light emitting diode D3, one end of the third relay K3 and the negative electrode of the zener diode DX.

Further, the control circuit includes a fuse F1, a first resistor R1, a first diode D1, a second diode D2, a first relay K1, a second relay K2, a power supply E, a lamp HL, a first switch S1, a second switch S2, a wiring hole XS1, a wiring hole XS2, a wiring hole GY1, and a wiring hole GY 2; the control switch KK comprises a contact 1, a contact 2, a contact 3, a contact 4, a contact 5, a contact 6, a contact 7 and a contact 8;

the connection hole GY1 is connected with the contact 1, the connection hole GY2 is connected with the contact 7, the connection hole XS1 is connected with the contact 3, and the connection hole XS2 is connected with the contact 5;

the contact 4 is connected with one end of a fuse F1, the other end of the fuse F1 is connected with one end of a first resistor R1 and a terminal X1 of a circuit detection unit XS, the other end of the first resistor R1 is connected with the negative electrode of a first diode D1, the positive electrode of a first diode D1 is connected with the other end of a first relay K1 and the negative electrode of a second diode D2, a terminal X2 of the circuit detection unit XS is connected with one end of a normally open contact of a second relay K2, and the other end of the normally open contact of the second relay K2 is connected with the other end of a second switch S2 and the positive electrode of a power supply E.

Furthermore, a rotatable operating handle is arranged on the control switch KK.

Furthermore, the circuit detection unit is fixedly connected with the test wire of the detection test module according to a preset fixing mode.

Furthermore, the circuit on-off measuring unit detects that the preset connection state of the control loop of the high-voltage switch cabinet comprises a preset short circuit state, a preset open circuit state and a preset load state.

Further, the voltage value measuring unit is characterized in that the voltage of the high-voltage switch cabinet control loop is detected to be an alternating-current voltage of the high-voltage switch cabinet control loop or a direct-current voltage of the high-voltage switch cabinet control loop or an induced voltage of the high-voltage switch cabinet control loop.

Compared with the prior art, the utility model discloses contain following beneficial effect at least:

(1) this application design test module has functions such as circuit break-make measurement, alternating current-direct current voltage measurement, high voltage live detection, illumination, for making things convenient for the tester to look over the convenience, and circuit detecting element is in the same place with the test wire is installed, removes along with the test wire, guarantees all to be in operator visual range when the test, can effectively improve experimental convenience, improves experimental work efficiency.

(2) Through getting electric and cutting off the power supply of relay K1, realize that circuit break-make measurement and voltage measurement function can be according to external circuit automatic switch.

(3) The design comes the illumination function, and the convenience is debugged under the environment of light deficiency.

(4) The induction voltage judgment circuit is designed to solve the problem of induction voltage test of the control loop of the high-voltage switch cabinet.

(5) The high-voltage live detection circuit is designed, sinusoidal alternating voltage with the frequency of 50 Hz can be generated, and the debugging problem of the high-voltage live display product is solved.

(6) The operating handle of the control switch and the position of the wire inserting hole are arranged, so that the test wire can be effectively prevented from being mistakenly connected, and the test module is protected.

Drawings

FIG. 1 is a diagram of a system for operating a test module for circuit testing of a high voltage switchgear;

FIG. 2 is a circuit schematic of a test module for circuit testing of a high voltage switchgear;

FIG. 3 is a circuit schematic of the circuit detection unit;

fig. 4 is a schematic circuit diagram of the high voltage electrification detecting unit.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Examples

A test module for circuit detection is mainly used for a high-voltage switch cabinet and comprises a control circuit, a control switch KK and a circuit detection unit XS,

the circuit detection unit XS comprises a circuit on-off measurement unit and a voltage value measurement unit;

As shown in FIG. 2, the test module for circuit detection further comprises a high voltage live detection unit GY.

The circuit detection unit XS is used for detecting a preset connection state of an external circuit of the high-voltage switch cabinet and measuring the voltage of a control loop of the high-voltage switch cabinet; as shown in fig. 3, the connection of the terminal X2, the buzzer HA, the light emitting diode D3, the relay coil K3 and the terminal X1 in the circuit detection unit can realize the detection of the preset connection state of the high-voltage switch cabinet control loop, including the preset short-circuit state, the preset open-circuit state and the preset load state; the terminal X3, the switch S3, the capacitor CX, the resistor RX, the voltage stabilizing diode DX, the relay K3 and the voltage gauge head V in the circuit detection unit can realize the measurement of the voltage of the control loop of the high-voltage switch cabinet.

The specific working principle is as follows:

as shown in fig. 1, the circuit detecting unit XS and the high voltage live detecting unit GY are both connected to the control circuit, wherein the circuit detecting unit XS and the testing wires connected to the wiring holes XS1 and XS2 are fixed together according to a preset fixing manner, wherein the circuit detecting unit XS and the testing wires can be fixed together by using a fixing clip or a wire, so that the circuit detecting unit and the testing wires are mounted together and move along with the testing wires to ensure that the circuit detecting unit and the testing wires are within the visual range of an operator during testing.

The function selection of the test module is determined by a control switch KK, the control switch KK comprises a contact 1, a contact 2, a contact 3, a contact 4, a contact 5, a contact 6, a contact 7 and a contact 8, when a rotatable operating handle of the control switch KK is in the position shown in figure 1, the positions of connecting holes GY1 and GY2 are blocked by the operating handle, a test wire can only be inserted into connecting holes XS1 and XS2, and the current connection of the test module is a circuit detection unit XS; when the operating handle of control switch KK is in parallel position, the position of wiring hole XS1, XS2 is blocked by operating handle, and the test wire can only insert wiring hole GY1, GY2, and what test module's current access was high voltage live detecting element GY, and wherein this kind of design of operating handle and plug wire hole can avoid the misconnection of test wire.

According to the test requirement, a test circuit corresponding to the control switch KK is selected, as shown in FIG. 2, when an operating handle of the control switch is at a position 1, the contacts 3-4 and 5-6 are connected, the test module can realize a circuit detection function, and the circuit can automatically complete circuit parameter test according to the conditions of external circuits connected with the contacts XS1 and XS 2.

In fig. 2, the coil rated voltage of the first relay K1 is 24V, and the coil rated voltage of the second relay K2 is direct current 9V; f1 is a fuse; r1 is a current limiting resistor; the first diode D1 and the second diode D2 are zener diodes, the voltage withstanding value of the first diode D1 is 12V, and the voltage withstanding value of the second diode D2 is 24V; the power supply E is a 9V battery; HL is an illuminating lamp, and the rated voltage is 9V; the first switch S1 is a lighting switch, the second switch S2 is a test switch, XS is a circuit detecting unit, and GY is a high voltage live detecting unit.

Wherein the circuit detection unit XS is used for detecting the connection state of the control loop of the high-voltage switch cabinet and measuring the voltage of the control loop of the high-voltage switch cabinet, wherein the connection state of the control loop of the high-voltage switch cabinet comprises a preset short circuit state, a preset open circuit state and a preset load state,

for the circuit detection unit XS to detect the connection state of the high-voltage switch control loop, that is, to measure the on/off state of the high-voltage switch control loop and to measure the on/off state of the external circuits connected to XS1 and XS2, the specific circuit principle is as follows: the testing method comprises the steps that a testing line is in contact with a circuit to be tested in a high-voltage switch cabinet through a wiring hole XS1 and a wiring hole XS2, a second switch S2 is closed and tested, a power supply E forms a loop through a normally closed contact of a first relay K1 and a coil of a second relay K2, after the power supply is powered on, the coil of the second relay K2 acts, the normally open contact of the second relay K2 is delayed to be closed, and the power supply is composed of an E positive pole → a relay K2 contact → a circuit detection unit terminal X2 → a circuit detection unit terminal X1 → a fuse F1 → a control switch contact 4 → a control switch contact 3 → a wiring hole XS1 → a circuit to be tested → the wiring hole XS2 → the control switch contact 5 → the control switch contact 6 → a power supply E negative pole to form a measuring.

Further, an internal circuit of the circuit detection unit is shown in fig. 3, and the circuit detection unit is composed of two parts of circuit on-off measurement and voltage value measurement; the circuit on-off measuring unit includes: a terminal X1, a terminal X2, a buzzer HA, a light emitting diode D3 and a third relay K3;

in the on-off circuit measuring unit, the terminal X2 is connected with one end of a buzzer HA and the anode of a light-emitting diode D3, and the other end of the buzzer HA is connected with one end of a relay K3, the anode of a voltage stabilizing diode DX, the V3 end of a voltage meter head V and a terminal X1;

as shown in fig. 3, the buzzer HA is connected between the circuit detecting unit terminals X1 and X2, the two ends of the coil of the third relay K3 are connected in parallel with the zener diode DX, the light emitting diode D3 is connected in series with the coil of the third relay K3 and then connected to the terminal X2, and the other end of the coil of the third relay K3 is connected to the terminal X1.

The rated working voltage of the buzzer is 9V, the rated current of the light-emitting diode is 810mA, the rated voltage of a coil of the third relay K3 is 24V, and the coil resistance is 900 omega.

The current test circuit state can be determined based on the states of the buzzer HA and the light emitting diode D3 of the circuit detection unit XS, which are specifically as follows:

when the circuit to be tested is in a wire connection stateIn the state (corresponding to short circuit), the voltage on the buzzer HA is 9V, and the current passing through the light emitting diode is

Therefore, the buzzer HA sounds, the light emitting diode D3 lights normally, and the tester can know that the circuit to be tested is in the direct connection state through the sound and the light.

When the circuit to be tested is in a lead disconnection state (equivalent to disconnection), at this time, the voltage on the buzzer HA is 0, and the current passing through the light-emitting diode D3 is 0, so that the buzzer HA cannot make a normal sound, the light-emitting diode D3 cannot light, and a tester can know that the circuit to be tested is in a disconnection state by no sound or no light.

When the circuit to be tested is in a loaded state, at the moment, due to the influence of load resistance, in a control loop of the high-voltage switch cabinet, the number of the loads is more than that of the relays, the resistance value of a coil of the high-voltage switch cabinet is between 1k omega and 10k omega, the low value of the coil is 1k omega, because the resistance value of a buzzer is 88 omega, most of power supply voltage is applied to the loads according to the circuit principle, and the voltage on the buzzer is applied to the load

The current through the LED is also reduced to

Therefore, the buzzer cannot sound, the light emitting diode D3 emits dark light, and the tester can know that the circuit to be tested is in the load connection state by the absence of sound and dark light.

According to the specific principle and the detection method for detecting the connection state of the control circuit of the high-voltage switch cabinet by the circuit detection unit XS, the circuit detection unit XS can realize the automatic switching of the on-off measurement (the connection state of the control circuit) and the voltage measurement function of the circuit according to the external circuit through the power on and power off of the first relay K1. The voltage measurement of the high-voltage switch cabinet control loop is alternating current voltage of the high-voltage switch cabinet control loop or direct current voltage of the high-voltage switch cabinet control loop or induction voltage of the high-voltage switch cabinet control loop.

The voltage measurement function is specifically as follows: the voltage of the external control loop of the XS1 and the XS2 is measured, the test line is contacted with the circuit to be tested, and the circuit detection unit terminal X1 → the fuse F1 → the control switch contact point 4 → the control switch contact point 3 → the wiring hole XS1 → the circuit to be tested → the wiring hole XS2 → the control switch contact point 5 → the control switch contact point 6 → the circuit detection unit terminal X3 form the circuit for measuring the voltage of the control loop.

As shown in fig. 3, the circuit detecting unit terminal X3 is connected to the junction of the zener diode DX and the led D3 through the first contact S31 of the third switch S3, the capacitor CX, and the resistor RX. The circuit detection unit end X3 is connected to the V1 end of the voltmeter head V through the second contact S32 of the switch S3, the V1 end is connected with the capacitor CX through the first contact K31 of the third relay K3, and the V2 end of the voltmeter head V is connected with the capacitor CX through the second contact K32 of the third relay K3. V3 of the voltmeter head V is connected with the circuit detection unit end X1, the withstand voltage value of the voltage stabilizing diode DX is 24V, and the rated voltage of the coil of the third relay K3 is 24V.

When the circuit to be tested is alternating-current voltage, at the moment, the external testing circuit forms a loop through a first contact S31 of a third switch S3, a capacitor CX, a resistor RX and a relay K3, a coil of the third relay K3 is electrified, the first contact K31 of the third relay K3 is closed, the voltage to be tested is added between voltage meter head terminals V1 and V3, and the voltage meter head displays the alternating-current voltage value to be tested.

In a control loop of a high-voltage switch cabinet, induced voltage is generated sometimes, so that interference is caused to normal operation of a circuit, and the problem of how to judge whether the induced voltage is the circuit test is a difficult problem. In this example, when the voltmeter head V displays the measured ac voltage, the third switch S3 is pressed, the voltage to be measured is connected to the voltmeter head terminal V1 through the first contact S31 of the third switch S3, and the second contact S32 of the third switch S3 is disconnected from other circuits, because the induced voltage is characterized by a small capacity, and the voltage varies with the circuit load, so that the ac voltage measured twice changes greatly, and it can be determined that the voltage is the induced voltage if the difference between the measured values measured twice before and after the third switch S3 is pressed is large.

When the circuit to be tested is the direct current voltage, at this moment, because the direct current voltage can not pass through the external capacitor CX, the coil of the third relay K3 can not get power. The voltage to be measured is added between the voltage meter head terminals V2 and V3 through a second contact K31 of the third relay K3, and the voltage meter head displays the value of the direct-current voltage to be measured.

In order to prevent overvoltage and internal circuit short circuit during measurement, a fuse F1 is arranged in the circuit detection unit to protect the short circuit.

In the test process, when measuring external circuit break-make, add voltage if external circuit suddenly, conventional measuring instrument (universal meter) can damage the utility model discloses in, if external circuit adds voltage suddenly, first relay K1 coil gets electric, and its normally closed contact K1 that first relay K1 corresponds breaks off, and second relay K2 coil loses electricity, and the normally open contact that second relay K2 corresponds breaks off, breaks off relevant circuit at the back, and the protection is not damaged. Meanwhile, the circuit function is switched to a voltage measurement loop, and the automatic switching function of the measurement function is realized. Similarly, when the voltage of the external circuit is tested, the on-off test function of the circuit can be automatically switched. The voltage stabilizing diode D2 is used for ensuring the coil working voltage of the first relay K1, the voltage stabilizing diode D1 and the resistor R1 are used for preventing the power supply E from forming a loop through the coil of the first relay K1, the voltage of the power supply E is 9V, the voltage withstanding value of the voltage stabilizing diode D1 is 12V, the voltage of the power supply E is smaller than the voltage withstanding value of the voltage stabilizing diode D1, and the diode D1 cannot be conducted. Therefore, the power supply E cannot form a loop through the K1, and the accuracy of the on-off test of the circuit can be ensured.

Outputting a preset voltage to the high-voltage live detection circuit GY, and detecting whether the connection of the high-voltage live display circuit of the high-voltage switch cabinet is a preset correct connection or not under the preset voltage

As shown in FIG. 2, when the rotary handle of the switch KK is at the 2 position, the contacts 1-2 and 7-8 are connected, and the test module can realize the circuit detection function. A second switch S2 is tested by pressing, the voltage of a power supply E is connected to terminals Y1 and Y2 of a high-voltage electrified detection unit GY, Y3 and Y4 of the high-voltage electrified detection unit work to generate sine-wave alternating voltage, the alternating voltage is connected to GY1 and GY2 wiring holes through control switch contacts, one end of a test wire is connected with GY1 and GY2 wiring holes, the other end of the test wire is connected with a corresponding wiring terminal of a product to be tested, and the simulation test of the high-voltage electrified display product can be realized. As shown in FIG. 4, the high-voltage electrification detecting unit consists of an operational amplifier U1, a resistor R2, R3, R4, a R5, a capacitor C1 and a capacitor C2. The terminal Y1 is connected to the 4 terminal of the operational amplifier U1, the terminal Y2 is connected to the 5 terminal of the operational amplifier U, and the operational amplifier U1 is provided with working power; the resistors R2 and C1 are connected in series between the end 1 and the end 3 of the operational amplifier U1, the resistor R3 and the capacitor C2 are connected in parallel and are connected between the end 1 of the operational amplifier U1 and the terminal Y4, the resistor R4 is connected between the end 2 and the end 3 of the operational amplifier U1, and the resistor R5 is connected between the end 2 of the operational amplifier U1 and the terminal Y4. The values of the resistors R1 and R2 are 10k Ω, the values of the capacitors C1 and C2 are 0.32 μ F, the value of the resistor R4 is 4k Ω, and the value of the resistor R5 is 1.5k Ω.

The circuit operation principle is that when the terminals Y1 and Y2 are connected with the working power supply, the circuit works at the terminals Y3 and Y4 to generate sinusoidal alternating current voltage, and the frequency of the voltage is represented by the formula

It is determined that the voltage frequency can be obtained as

Therefore, the output voltage frequency is the same as the frequency of the power grid in China, and the real working condition can be simulated. The high-voltage live detection circuit is designed, sinusoidal alternating voltage with the frequency of 50 Hz can be generated, and the debugging problem of the high-voltage live display product is solved.

In the process of the test, because cubical switchboard structure or on-the-spot lighting reason, some wait to test the circuit and be in under the environment of dark, cause experimental inconvenience the utility model discloses in, as shown in fig. 2, can press testing arrangement lighting switch S1, light HL lights, makes things convenient for test work to go on.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein will be apparent to those skilled in the art without departing from the scope and spirit of the invention as defined in the accompanying claims.

Claims

1. A test module for circuit detection comprises a control circuit and a control switch KK, and is characterized by further comprising a circuit detection unit XS, wherein the circuit detection unit XS comprises a circuit on-off measurement unit and a voltage value measurement unit;

2. The test module for circuit testing of claim 1, wherein the circuit on-off measuring unit comprises: a terminal X1, a terminal X2, a buzzer HA, a light emitting diode D3 and a third relay K3;

3. A test module for circuit inspection according to claim 2, wherein the control circuit comprises a fuse F1, a first resistor R1, a first diode D1, a second diode D2, a first relay K1, a second relay K2, a power source E, a lamp HL, a first switch S1, a second switch S2, a wiring hole XS1, a wiring hole XS2, a wiring hole GY1, and a wiring hole GY 2; the control switch KK comprises a contact 1, a contact 2, a contact 3, a contact 4, a contact 5, a contact 6, a contact 7 and a contact 8;

4. The test module for circuit testing as claimed in claim 1, wherein the control switch KK is provided with a rotatable operating handle.

5. The test module for circuit detection according to claim 1, wherein the circuit detection unit is fixedly connected with the test wire of the test module for detecting the high-voltage switch cabinet according to a preset fixing mode.

6. The test module for circuit testing of claim 1, wherein the on/off circuit measuring unit detects predetermined connection states of the control circuit of the high voltage switchgear including a predetermined short circuit state, a predetermined open circuit state and a predetermined load state.

7. The test module for circuit detection according to claim 1, wherein the voltage value measuring unit detects the voltage of the high voltage switch cabinet control loop as an alternating current voltage of the high voltage switch cabinet control loop or a direct current voltage of the high voltage switch cabinet control loop or an induced voltage of the high voltage switch cabinet control loop.