CN213750154U

CN213750154U - Electrical test power capacitor fault detection device

Info

Publication number: CN213750154U
Application number: CN202023093029.9U
Authority: CN
Inventors: 王金刚; 李凤梅; 张超; 张奎; 郑瑞萍; 王仰贵
Original assignee: Yongcheng Coal and Electricity Holding Group Co Ltd
Current assignee: Yongcheng Coal and Electricity Holding Group Co Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-07-20
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a power capacitor fault detection device for electrical test, which comprises a power capacitor operation circuit, a fault detection circuit and an alarm circuit; the power capacitor operation circuit, the fault detection circuit and the alarm circuit are connected in sequence; after a fuse F1 in the power capacitor operation circuit is fused, abnormal electric signals are generated at two ends of a variable resistor R4 in the fault detection circuit, a triode Q1 or a triode Q2 in the fault detection circuit is conducted through the abnormal electric signals, the abnormal electric signals are transmitted to a delay circuit in the fault detection circuit by a triode Q1 or a triode Q2, the delay circuit delays the abnormal electric signals and transmits the delayed electric signals to a relay control circuit in the fault detection circuit, the relay control circuit transmits the abnormal electric signals to an alarm circuit, and the problem that the power capacitor cannot timely switch another automatic discharge circuit and timely give alarm reminding in the prior art after the fuse is fused is effectively solved.

Description

Electrical test power capacitor fault detection device

Technical Field

The utility model relates to a power capacitor field especially relates to an electrical test power capacitor fault detection device.

Background

The electric test work of colliery maintenance operation can meet the maintenance of power capacitor, the power capacitor that has repaired has various uncertain factors to lead to power capacitor to break down, power capacitor carries reactive power to electric power system in the electric wire netting operation, when the maintainer carries out power capacitor maintenance work and stops power capacitor operation, because power capacitor has the characteristics of storage electric energy, will rely on the voltage transformer that self brings to discharge, power capacitor has concatenated the fuse, if power capacitor breaks down and makes the fuse blow when discharging, then power capacitor can't carry out the automatic discharge.

In the prior art, when the power capacitor can not discharge by itself, a maintainer uses a discharging rod to discharge the power capacitor, because the electrified condition of the power capacitor is not clear among the maintainers, if the discharging operation is not standard, hidden dangers exist for the safety of the maintainer, and after a fuse is fused, the problem that the power capacitor cannot be timely switched to another automatic discharging loop and can give an alarm prompt in time exists in the prior art.

Therefore, the utility model provides a new scheme to solve the problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electric test power capacitor fault detection device, the effectual solution after the fuse fuses, has had another automatic discharge circuit of timely switching of power capacitor among the prior art and in time gives the problem of warning.

The technical scheme for solving the problem is that the detection device for the fault of the power capacitor in the electrical test comprises a power capacitor operation circuit, a fault detection circuit and an alarm circuit; the power capacitor operation circuit, the fault detection circuit and the alarm circuit are connected in sequence; after a fuse F1 in the power capacitor operation circuit is fused, abnormal electric signals are generated at two ends of a variable resistor R4 in the fault detection circuit, the abnormal electric signals enable a triode Q1 or a triode Q2 in the fault detection circuit to be conducted, a triode Q1 or a triode Q2 transmits the abnormal electric signals to a delay circuit formed by a resistor R7, a resistor R8, a resistor R9, a diode D1, a capacitor C1 and an operational amplifier A1 in the fault detection circuit, the delay circuit delays the abnormal electric signals and transmits the delayed electric signals to a relay control circuit formed by a resistor R11, a resistor R16, a relay J1, a diode D2 and a triode Q3 in the fault detection circuit, the relay control circuit controls whether the relay J1 is in a current flowing state, when the relay J1 is in a current flowing state, a normally open switch SW4 of a relay 1 is closed, and the relay control circuit transmits the abnormal electric signals to an alarm circuit, light emitting diode D3 in the alarm circuit is luminous, buzzer Bell sound alarm, alarm circuit transmits alarm signal to control center simultaneously, carry out remote warning, make relay J1 break off when circulation current makes relay J1's normally closed switch SW1, relay J1's normally open switch SW2, SW3 is closed, make voltmeter V1 connect and carry out the voltage display at power capacitor CX's both ends, power capacitor CX switches discharge circuit, power capacitor CX discharges through utilizing the series circuit that inductance L1, resistance R3, variable resistance R4, resistance R2 constitute.

The utility model discloses the beneficial effect who realizes:

after a fuse F1 in the power capacitor operation circuit is fused, abnormal electric signals are generated at two ends of a variable resistor R4 in the fault detection circuit, the abnormal electric signals enable a triode Q1 or a triode Q2 in the fault detection circuit to be conducted, the triode Q1 or a triode Q2 transmits the abnormal electric signals to a delay circuit formed by a resistor R7, a resistor R8, a resistor R9, a diode D1, a capacitor C1 and an operational amplifier A1 in the fault detection circuit, the delay circuit delays the abnormal electric signals, after the fuse is fused, the fault detection circuit utilizes the triode Q1, the triode Q2 and the delay circuit to respectively improve the timeliness of switching another automatic discharge circuit and giving an alarm prompt by the power capacitor in current intensity and current duration, and the problem that the power capacitor cannot be timely switched to another automatic discharge circuit and give an alarm prompt in time in the prior art after the fuse is fused is effectively solved.

Drawings

Fig. 1 is the utility model relates to an electrical test power capacitor fault detection device's circuit schematic diagram.

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

The present invention provides an electrical test power capacitor fault detection device, which will be described in detail by embodiments with reference to the accompanying drawings.

A fault detection device for an electrical test power capacitor comprises a power capacitor operation circuit, a fault detection circuit and an alarm circuit; the power capacitor operation circuit, the fault detection circuit and the alarm circuit are connected in sequence; after a fuse F1 in the power capacitor operation circuit is fused, abnormal electric signals are generated at two ends of a variable resistor R4 in the fault detection circuit, the abnormal electric signals enable a triode Q1 or a triode Q2 in the fault detection circuit to be conducted, a triode Q1 or a triode Q2 transmits the abnormal electric signals to a delay circuit formed by a resistor R7, a resistor R8, a resistor R9, a diode D1, a capacitor C1 and an operational amplifier A1 in the fault detection circuit, the delay circuit delays the abnormal electric signals and transmits the delayed electric signals to a relay control circuit formed by a resistor R11, a resistor R16, a relay J1, a diode D2 and a triode Q3 in the fault detection circuit, the relay control circuit controls whether the relay J1 is in a current flowing state, when the relay J1 is in a current flowing state, a normally open switch SW4 of a relay 1 is closed, and the relay control circuit transmits the abnormal electric signals to an alarm circuit, light emitting diode D3 in the alarm circuit is luminous, buzzer Bell sound alarm, alarm circuit transmits alarm signal to control center simultaneously, carry out remote warning, make relay J1 break off when circulation current makes relay J1's normally closed switch SW1, relay J1's normally open switch SW2, SW3 is closed, make voltmeter V1 connect and carry out the voltage display at power capacitor CX's both ends, power capacitor CX switches discharge circuit, power capacitor CX discharges through utilizing the series circuit that inductance L1, resistance R3, variable resistance R4, resistance R2 constitute.

The power capacitor operation circuit comprises a power capacitor CX, the two ends of the power capacitor CX are connected with the grid voltage, one end of the power capacitor CX is connected with one end of a normally closed switch SW1 of the relay J1, the other end of the power capacitor CX is connected with one end of a fuse F1, and a voltage transformer is connected between the other end of the fuse F1 and the other end of the normally closed switch SW1 of the relay J1;

the working principle of the power capacitor operation circuit is as follows: the power grid voltage is alternating current, when the power capacitor CX is connected with the power grid voltage, the voltage transformer circulates alternating current, the alternating current impedance of the voltage transformer is large, and the normal operation of a power grid system is not influenced; because the power capacitor CX has the characteristic of storing electric energy, when the power grid voltage is cut off, the power capacitor CX carries out direct current discharge through the voltage transformer.

The fault detection circuit comprises a normally open switch SW2 of a relay J1, a normally open switch SW3 of a relay J1 and an inductor L1, one end of a normally open switch SW2 of a relay J1 is connected with one end of a voltmeter V1, one end of a power capacitor CX in a power capacitor operation circuit and one end of a normally closed switch SW1 of the relay J1 respectively, the other end of the voltmeter V1 is connected with one end of the normally open switch SW3 of the relay J1, the other end of the normally open switch SW3 of the relay J1 is connected with the other end of the power capacitor CX in the power capacitor operation circuit, one end of a fuse F1 and one end of an inductor L1 in the power capacitor operation circuit respectively, the other end of the normally open switch SW2 of the relay J1 is connected with the other end of a fuse F1 and one end of a resistor R2 in the power capacitor operation circuit, the other end of the inductor L1 is connected with one end of a resistor R3, and the other end of a variable resistor R4 is connected with the other end of the resistor R3 respectively, The collector of a triode Q1, the base of a triode Q2, the other end of a resistor R2 is respectively connected with the other end of a variable resistor R4, the base of a triode Q1 and the emitter of a triode Q2, the emitter of a triode Q1 is respectively connected with one end of a resistor R5, one end of a resistor R6, the collector of a triode Q2, one end of a resistor R7 and the cathode of a diode D1, the other end of a resistor R5 is connected with a power VCC, the other end of a resistor R6 is grounded, the other end of a resistor R7 is respectively connected with the non-inverting input end of an operational amplifier A1, the anode of a diode D1 and one end of a capacitor C1, the other end of a capacitor C1 is grounded, the inverting input end of an operational amplifier A1 is respectively connected with one end of a resistor R8 and one end of a resistor R9, the other end of a resistor R8 is connected with the power VCC, the other end of a resistor R9 is connected with the ground, the output end of an operational amplifier A1 is connected with one end of a resistor R10, the other end of a resistor R10 is respectively connected with the cathode of a voltage regulator D4, The power supply comprises a base electrode of a triode Q3, a positive electrode of a voltage regulator tube D4 is connected with a positive electrode of a voltage regulator tube D5, a negative electrode of a voltage regulator tube D5 is connected with the ground, a collector electrode of the triode Q3 is connected with one end of a resistor R11, the other end of a resistor R11 is connected with a power supply VCC, an emitter electrode of the triode Q3 is connected with one end of the resistor R16, the other end of the resistor R16 is respectively connected with one end of a relay J1 and the negative electrode of a diode D2, and the other end of the relay J1 is connected with a positive electrode of a diode D2 and connected with the ground in parallel; a delay circuit is formed by a resistor R7, a resistor R8, a resistor R9, a diode D1, a capacitor C1 and an operational amplifier A1; a relay control circuit is formed by a resistor R11, a resistor R16, a relay J1, a diode D2 and a triode Q3;

the working principle of the fault monitoring circuit is as follows: when the power capacitor CX is connected with the grid voltage, a series circuit consisting of an inductor L1, a resistor R3, a variable resistor R4 and a resistor R2 is connected in parallel with two ends of a fuse F1, the voltage at two ends of the variable resistor R4 is small, and a triode Q1 and a triode Q2 are both in a cut-off state; when the voltage of the power grid is cut off, the power capacitor CX carries out direct current discharge through the voltage transformer, the current flowing through the fuse F1 is increased, the current flowing through the resistor R4 is increased, and when the fuse F1 works normally, most of the discharge current of the power capacitor CX flows through the fuse F1, a small part of the discharge current flows through the variable resistor R4, and the triode Q1 and the triode Q2 are still in a cut-off state; when the power capacitor CX is in fault, after the power grid voltage is cut off, the power capacitor CX has abnormal large voltage, the current passing through the fuse F1 is increased when the power capacitor CX discharges, after the large current lasts for a period of time, the fuse F1 generates heat to fuse the fuse F1, after the fuse F1 is fused, the current passing through the variable resistor R4 is increased instantly, abnormal electrical signals are generated at two ends of the variable resistor R4, the abnormal electrical signals enable two ends of the variable resistor R4 to generate enough voltage difference, when the voltage of the other end of the variable resistor R4 connected with the resistor R3 is larger than the voltage of the other end of the variable resistor R4 connected with the resistor R2, the triode Q1 is conducted, the triode Q2 is cut off, when the voltage of the other end of the variable resistor R4 connected with the resistor R3 is less than the voltage of the other end of the variable resistor R4 connected with the resistor R2, the triode Q2 is switched on, and the triode Q1 is switched off; a resistor R7, a resistor R8, a resistor R9, a diode D1, a capacitor C1 and an operational amplifier A1 form a delay circuit, when a triode Q1 and a triode Q2 are both cut off, the operational amplifier A1 outputs a low level, when one of a triode Q1 and a triode Q2 is conducted, an operational amplifier A1 outputs a high level, the operational amplifier A1 outputs a high level to represent a fault signal, the delay circuit improves the accuracy of the fault high level output by the fault detection circuit to prevent the fault detection circuit from mistakenly outputting a fault high level under the condition that a fuse F1 is fused due to a short-time large current, a voltage stabilizing circuit is formed by a voltage stabilizing tube D4 and a voltage stabilizing tube D5 to stabilize an electric signal output by the operational amplifier A1, when the operational amplifier A1 outputs a high level, the triode Q3 is conducted, a relay J1 is electrified, when the operational amplifier A1 outputs a low level, the triode Q3 is cut off, and the relay J1 does not obtain electricity.

The alarm circuit comprises a normally open switch SW4 of a relay J1, a resistor R14 and a resistor R15, wherein one end of a normally open switch SW4 of the relay J1 is respectively connected with an emitter of a triode Q3 and one end of a resistor R16 in a fault detection circuit, the other end of a normally open switch SW4 of the relay J1 is respectively connected with one end of the resistor R15 and one end of a resistor R14, the other end of the resistor R14 is connected with an anode of a light-emitting diode D3, a cathode of the light-emitting diode D3 is connected with an emitter of a triode Q4 and connected with the ground, the other end of the resistor R15 is respectively connected with a base and a control center of the triode Q4, a collector of the triode Q4 is connected with one end of a buzzer Bell, the other end of the buzzer Bell is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with a power supply VCC;

the working principle of the alarm circuit is as follows: after the relay J1 is electrified, the normally open switch SW4 of the pull-in relay J1, a diode D3 emits light, a triode Q4 is conducted, a buzzer Bell sends out alarm sound, meanwhile, an electric signal on the base of the triode Q4 is transmitted to a control center for remote reminding, after the relay J1 is electrified, the normally closed switch SW1 of the relay J1 is disconnected, the voltage transformer T1 and the power capacitor CX are completely disconnected, the safety of the voltage transformer T1 and a discharge circuit connected with the voltage transformer T1 is protected, more serious damage can not be caused, after the relay J1 is electrified, the normally open switch SW3 of the relay J1 is closed, a voltmeter V1 is connected to the two ends of the power capacitor CX, the voltage of the power capacitor CX is displayed, a person who catches up to repair knows the electrified conditions of the two ends of the power capacitor, after the relay J1 is electrified, the normally open switch SW2 of the relay J1 is closed, and the electricity is utilized to make the electricity, The series circuit composed of the resistor R3, the variable resistor R4 and the resistor R2 is directly connected to the two ends of the power capacitor CX for discharging, and the discharging speed of the series circuit is lower than that of a voltage transformer, so that the alarm circuit can continuously give an alarm to attract the attention of workers.

When the utility model is used, after the fuse F1 in the power capacitor operation circuit is fused, abnormal electric signals are generated at two ends of the variable resistor R4 in the fault detection circuit, the abnormal electric signals enable the triode Q1 or the triode Q2 in the fault detection circuit to be conducted, the triode Q1 or the triode Q2 transmits the abnormal electric signals to the delay circuit formed by the resistor R7, the resistor R8, the resistor R9, the diode D1, the capacitor C1 and the operational amplifier A1 in the fault detection circuit, the delay circuit transmits the abnormal electric signals to the relay control circuit formed by the resistor R11, the resistor R16, the relay J1, the diode D2 and the triode Q3 in the fault detection circuit after delaying, the relay control circuit controls whether the relay J1 is in current flowing, when the relay J1 is in current flowing, the normally open switch SW4 of the relay J1 is closed, the relay control circuit transmits an abnormal electric signal to the alarm circuit, a light emitting diode D3 in the alarm circuit emits light, a buzzer Bell gives an alarm, meanwhile, the alarm circuit transmits the alarm signal to a control center to carry out remote reminding, when the relay J1 is electrified and circulated, a normally closed switch SW1 of a relay J1 is switched off, normally open switches SW2 and SW3 of the relay J1 are switched on, a voltmeter V1 is connected to two ends of a power capacitor CX to display voltage, the power capacitor CX switches a discharge circuit, and the power capacitor CX discharges through a series circuit formed by an inductor L1, a resistor R3, a variable resistor R4 and a resistor R2; after the fuse is fused, the fault detection circuit utilizes the triode Q1, the triode Q2 and the delay circuit to respectively improve the timeliness of switching another automatic discharge circuit and giving an alarm prompt by the power capacitor in current intensity and current duration, and the problem that the power capacitor cannot be timely switched to another automatic discharge circuit and give an alarm prompt in time in the prior art after the fuse is fused is effectively solved.

Claims

1. The device for detecting the fault of the power capacitor in the electrical test is characterized by comprising a power capacitor operation circuit, a fault detection circuit and an alarm circuit; the power capacitor operation circuit, the fault detection circuit and the alarm circuit are connected in sequence;

after a fuse F1 in the power capacitor operation circuit is fused, abnormal electric signals are generated at two ends of a variable resistor R4 in the fault detection circuit, a triode Q1 or a triode Q2 in the fault detection circuit is conducted through the abnormal electric signals, a delay circuit consisting of a resistor R7, a resistor R8, a resistor R9, a diode D1, a capacitor C1 and an operational amplifier A1 is used for transmitting the abnormal electric signals to the fault detection circuit through a triode Q1 or a triode Q2, the delay circuit is used for transmitting the abnormal electric signals to the fault detection circuit after delaying, a relay control circuit consisting of a resistor R11, a resistor R16, a relay J1, a diode D2 and a triode Q3 is used for transmitting the abnormal electric signals to the alarm circuit through the relay control circuit.

2. The electrical test power capacitor fault detection device of claim 1, wherein the power capacitor operation circuit comprises a power capacitor CX, two ends of the power capacitor CX are connected to a grid voltage, one end of the power capacitor CX is connected with one end of a normally closed switch SW1 of a relay J1, the other end of the power capacitor CX is connected with one end of a fuse F1, and a voltage transformer is connected between the other end of the fuse F1 and the other end of the normally closed switch SW1 of the relay J1;

the alarm circuit comprises a normally open switch SW4 of a relay J1, a resistor R14 and a resistor R15, wherein one end of a normally open switch SW4 of the relay J1 is respectively connected with an emitter of a triode Q3 and one end of a resistor R16 in a fault detection circuit, the other end of a normally open switch SW4 of the relay J1 is respectively connected with one end of the resistor R15 and one end of a resistor R14, the other end of the resistor R14 is connected with an anode of a light emitting diode D3, a cathode of the light emitting diode D3 is connected with an emitter of a triode Q4 and connected with the ground, the other end of the resistor R15 is respectively connected with a base and a control center of the triode Q4, a collector of the triode Q4 is connected with one end of a buzzer Bell, the other end of the buzzer Bell is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with a power supply VCC.

3. The electrical test power capacitor fault detection device of claim 1, wherein the fault detection circuit comprises a normally open switch SW2 of a relay J1, a normally open switch SW3 of a relay J1, an inductor L1, one end of a normally open switch SW2 of a relay J1 being connected to one end of a voltmeter V1, one end of a power capacitor CX in the power capacitor operating circuit, one end of a normally closed switch SW1 of a relay J1, the other end of the voltmeter V1 being connected to one end of a normally open switch SW3 of a relay J1, the other end of a normally open switch SW3 of a relay J1 being connected to the other end of the power capacitor CX in the power capacitor operating circuit, one end of a fuse F1 in the power capacitor operating circuit, one end of an inductor L1, the other end of a normally open switch SW2 of the relay J1 being connected to the other end of a fuse F1 in the power capacitor operating circuit, one end of a resistor R2, the other end of the inductor L1 is connected with one end of a resistor R3, the other end of the resistor R3 is respectively connected with one end of a variable resistor R4, a collector of a triode Q1 and a base of a triode Q2, the other end of the resistor R2 is respectively connected with the other end of the variable resistor R4, the base of the triode Q1 and an emitter of a triode Q2, an emitter of the triode Q1 is respectively connected with one end of a resistor R5, one end of the resistor R6, a collector of a triode Q2, one end of a resistor R7 and a cathode of a diode D1, the other end of the resistor R5 is connected with a power supply VCC, the other end of the resistor R6 is grounded, the other end of the resistor R7 is respectively connected with a non-inverting input end of an operational amplifier A1, an anode of the diode D1 and one end of a capacitor C1, the other end of the capacitor C1 is grounded, the other end of the operational amplifier A1 is respectively connected with one end of a resistor R8 and one end of the resistor R9, the other end of the resistor R8 is connected with the power supply VCC and the other end of the resistor R9 is grounded, the output end of the operational amplifier A1 is connected with one end of a resistor R10, the other end of the resistor R10 is respectively connected with the negative electrode of a voltage regulator tube D4 and the base electrode of a triode Q3, the positive electrode of the voltage regulator tube D4 is connected with the positive electrode of a voltage regulator tube D5, the negative electrode of the voltage regulator tube D5 is connected with the ground, the collector electrode of the triode Q3 is connected with one end of a resistor R11, the other end of the resistor R11 is connected with a power supply VCC, the emitter electrode of the triode Q3 is connected with one end of the resistor R16, the other end of the resistor R16 is respectively connected with one end of a relay J1 and the negative electrode of a diode D2, and the other end of the relay J1 is connected with the positive electrode of the diode D2 and connected with the ground in parallel; a delay circuit is formed by a resistor R7, a resistor R8, a resistor R9, a diode D1, a capacitor C1 and an operational amplifier A1; a relay control circuit is formed by a resistor R11, a resistor R16, a relay J1, a diode D2 and a triode Q3.