CN2427885Y - DC insulation supervisory relay - Google Patents

DC insulation supervisory relay Download PDF

Info

Publication number
CN2427885Y
CN2427885Y CN 00223153 CN00223153U CN2427885Y CN 2427885 Y CN2427885 Y CN 2427885Y CN 00223153 CN00223153 CN 00223153 CN 00223153 U CN00223153 U CN 00223153U CN 2427885 Y CN2427885 Y CN 2427885Y
Authority
CN
China
Prior art keywords
resistance
diode
direct current
current supply
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 00223153
Other languages
Chinese (zh)
Inventor
马中长
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN 00223153 priority Critical patent/CN2427885Y/en
Application granted granted Critical
Publication of CN2427885Y publication Critical patent/CN2427885Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

The utility model relates to a DC insulation supervisory relay, which is composed of a casing, a panel, a power supply circuit, an insulation supervision and detection circuit, an alarm parameter setting circuit, a window comparator circuit, an earthing indication circuit, and a switching signal output circuit. The utility model is used in a DC power supply system, and carries out real time monitoring for the insulation condition between the positive and the negative poles of the power supply and the earth. When the insulation condition is reduced to the lowest insulation level, indication signals and switching signals are sent out with sensitive and quick response.

Description

Dc insulating monitoring relay
The utility model relates to a kind of relay, be particularly related to a kind of dc insulating monitoring relay, be applicable in 48～220V DC power-supply circuit, the positive pole of power supply and the insulation status between negative pole and the ground are carried out real time monitoring, when it is reduced to the minimum insulating resistance value of setting, send index signal and switching signal.
Along with improving constantly of automaticity in the modern industry, and the extensive use of electronic technology needs the equipment of direct current supply increasing, and the electric power system that for example do not have a power failure in loop such as the operation in the electric power system, indication, signal and the communication system all is extensive use of the direct current supply mode.Be the long-term operate as normal of assurance equipment, just need its power supply that higher reliability and stability are arranged, apply to carry out in the direct current system product of insulation monitoring in the prior art, for example the JJJ-1 dc insulating monitoring relay of Xuchang Relay Factory's production uses in the direct current supply of electric power system, exist complex structure, technological requirement is higher, bulk temperature rose very big during power consumption big (about 4.5W) was used, after moving half an hour, almost just dare not contact with human body again, usually will partly form structure in the long-time running burns, distortion, and after devoting oneself to work, the positive pole and the negative pole direct resistance drop over the ground (220V) to 25K Ω of direct current supply only there are switching signal, can't directly indicate negative or positive electrode fault etc.
The purpose of this utility model is intended to overcome deficiency of the prior art, provide a kind of and can improve anodal and negative pole direct resistance value (being brought up to more than the 150K Ω by 25K Ω) over the ground in the direct current supply, can correctly indicate is the dc insulating monitoring relay that the fault of insulation reduction takes place negative or positive electrode.
A kind of dc insulating monitoring relay comprises: shell, and panel, direct current supply positive pole and negative pole, earth electrode a and two switching signal output b, c, its feature part is also to comprise:
An insulation monitoring testing circuit is by diode D 1～D 4, resistance R 1～R 5Form; Diode D 1～D 4Form bridge rectifier, resistance R 1A terminating diode D 1Anode and diode D 2The tie point of negative electrode, another termination direct current supply positive pole, diode D 3Anode and diode D 4Negative electrode meets earth electrode a, diode D after linking to each other 1, D 3The negative electrode back connecting resistance R that links to each other 2An end, diode D 2, D 4The anode back connecting resistance R that links to each other 3An end, resistance R 2, R 3The other end back connecting resistance R that links to each other 4An end, resistance R 4Other end connecting resistance R 5An end, resistance R 5The negative pole of another termination direct current supply;
Power supply circuits are by diode D 5, resistance R 10, voltage-stabiliser tube DW forms; Diode D 5Anode meet direct current supply positive pole, negative electrode connecting resistance R 10One end, resistance R 10The positive pole of another termination voltage-stabiliser tube DW, voltage-stabiliser tube DW negative pole connects the direct current supply negative pole;
An alarm parameters initialization circuit is by adjustable resistance RW 1, RW 2, resistance R 7Form adjustable resistance RW 1A terminating resistor R 10With the tie point of voltage-stabiliser tube DW positive pole, other end connecting resistance R 7An end, adjustable resistance RW 2A terminating resistor R 7The other end, another termination direct current supply negative pole, adjustable resistance RW 1The anodal insulation against ground resistance of decision direct current alarming value, adjustable resistance RW 2Decision direct current negative pole insulation against ground resistance alarming value;
A window comparator circuit is by resistance R 6Form with double operational integrated circuit (IC) (LM358), 2 pin of integrated circuit (IC) (voltage input end that direct current supply negative pole insulation against ground resistance value transforms) are connected back connecting resistance R with 5 pin (voltage input end that the anodal insulation against ground resistance value of direct current supply transforms) 6An end, resistance R 6Other end connecting resistance R 4With R 5Tie point, 3 pin of integrated circuit (IC) (insulation against ground of direct current supply negative pole drops to the minimum value set point) meet adjustable resistance RW 2Adjustable end, 6 pin (insulation against ground of direct current supply negative pole drops to the minimum value set point) meet adjustable resistance RW 1Adjustable end, 8 pin (power end) connecting resistance R 10Connect the direct current supply negative pole with tie point, 4 pin of voltage-stabiliser tube DW positive pole;
A ground connection indicating circuit is by resistance R 8, LED 1And LED 2Form; Light-emitting diodes LED 1Anode connect 7 pin (direct current supply plus earth signal output part) of integrated circuit (IC), LED 2Anode connect 1 pin (direct current supply minus earth signal output part) of integrated circuit (IC), LED 1With LED 2The negative electrode back connecting resistance R that links to each other 8An end, R 8Another termination direct current supply negative pole;
A switching signal output circuit is by diode D 6, D 7, D 8, resistance R 9, triode Q and relay J are formed; Diode D 6, D 7Constitute AND circuit, diode D 6Anode connect 7 pin of integrated circuit (IC), diode D 7Anode connect 1 pin of integrated circuit (IC), diode D 6With D 7The negative electrode back connecting resistance R that links to each other 9An end, R 9The base stage of another termination triode Q, relay J one terminating diode D 8Negative electrode and direct current supply positive pole, another terminating diode of relay J D 8Anode and the collector electrode of triode Q, the emitter of triode Q connects the direct current supply negative pole.
Compared with prior art, the utlity model has following characteristics:
1. be quick on the draw, rapidly, adopt double operational integrated circuit (IC) (LM358), its input voltage is compared with set point, as long as 2 millivolts and above variation are arranged, just exporting index signal and alarm switch signal, is the desirable substitute products of existing dc insulating monitoring relay;
2. can directly indicate the fault of the negative or positive electrode generation insulation reduction that is direct current supply;
3. power consumption few (less than 0.7W) in the course of work, volume is little, selects to detect monitoring circuit R 1～R 5And resistance R 10Different resistance values just can be used for the DC power-supply system requirement of the different electric pressures of 48～220V.
Fig. 1 is the utility model embodiment theory structure block diagram;
Fig. 2 is the utility model embodiment circuit theory diagrams.
Be an embodiment of the present utility model below.
Referring to each accompanying drawing.A kind of dc insulating monitoring relay that is used for the 220V DC power-supply system in power plant, by shell, panel, direct current supply positive pole and negative pole, earth electrode a and two signal output part b, c, the insulation monitoring testing circuit, power supply circuits, alarm parameters initialization circuit, window comparator circuit, the ground connection indicating circuit, and the switching signal output circuit is formed.
Described insulation monitoring testing circuit is by diode D 1～D 4(being IN4007), resistance R 1～R 5Form; Diode D 1～D 4Form bridge rectifier, resistance R 1A terminating diode D (100K) 1Anode and diode D 2The tie point of negative electrode, another termination direct current supply positive pole, diode D 3Anode and diode D 4Negative electrode meets earth electrode a, diode D after linking to each other 1, D 3The negative electrode back connecting resistance R that links to each other 2An end (100K), diode D 2, D 4The anode back connecting resistance R that links to each other 3An end (50K), resistance R 2, R 3The other end back connecting resistance R that links to each other 4An end (80K), resistance R 4Other end connecting resistance R 5An end (20K), resistance R 5The negative pole of another termination direct current supply;
Described power supply circuits are by diode D 5(IN4007), resistance R 10(77K), voltage-stabiliser tube DW (24～30V 1/2W) forms; Diode D 5(IN4007) anode meets direct current supply positive pole, negative electrode connecting resistance R 10One end, resistance R 10The positive pole of another termination voltage-stabiliser tube DW, voltage-stabiliser tube DW negative pole connects the direct current supply negative pole;
Described alarm parameters initialization circuit is by adjustable resistance RW 1(22K), RW 2(47K), resistance R 7(10K) form adjustable resistance RW 1A terminating resistor R 10With the tie point of voltage-stabiliser tube DW positive pole, other end connecting resistance R 7An end, adjustable resistance RW 2A terminating resistor R 7The other end, another termination direct current supply negative pole, adjustable resistance RW 1The anodal insulation against ground resistance of decision direct current alarming value, adjustable resistance RW 2Decision direct current negative pole insulation against ground resistance alarming value;
Described window comparator circuit is by resistance R 6(1K) and double operational integrated circuit (IC) (LM358) form 2 pin of integrated circuit (IC) (voltage input end that direct current supply negative pole insulation against ground resistance value transforms) and connecting resistance R after 5 pin (voltage input end that the anodal insulation against ground resistance value of direct current supply transforms) are connected 6An end, resistance R 6Other end connecting resistance R 4With R 5Tie point, 3 pin of integrated circuit (IC) (insulation against ground of direct current supply negative pole drops to minimum set point) meet adjustable resistance RW 2Adjustable end, 6 pin connect (direct current supply anodal insulation against ground drop to minimum set point) and meet adjustable resistance RW 1Adjustable end, 8 pin (power end) connecting resistance R 10Connect the direct current supply negative pole with tie point, 4 pin of voltage-stabiliser tube DW positive pole;
Described ground connection indicating circuit is by resistance R 8(30K), LED 1And LED 2Form; Light-emitting diodes LED 1Anode connect 7 pin (direct current supply plus earth signal output part) of integrated circuit (IC), LED 2Anode connect 1 pin (the ground signalling output is born in direct current supply) of integrated circuit (IC), LED 1With LED 2The negative electrode back connecting resistance R that links to each other 8An end, R 8Another termination direct current supply negative pole;
Described switching signal output circuit is by diode D 6, D 7, D 8(being IN4007), resistance R 9(50K), triode Q (BUT11A) and relay J (JTX-13F) are formed; Diode D 6, D 7Constitute AND circuit, diode D 6Anode connect 7 pin of integrated circuit (IC), diode D 7Anode connect 1 pin of integrated circuit (IC), diode D 6With D 7The negative electrode back connecting resistance R that links to each other 9An end, R 9The base stage of another termination triode Q, relay J one terminating diode D 8Negative electrode and direct current supply positive pole, another terminating diode of relay J D 8Anode and the collector electrode of triode Q, the emitter of triode Q connects the direct current supply negative pole.
Operation principle: resistance R 1～R 5, diode D 1～D 4Constitute the detection monitoring circuit of galvanic positive pole and negative pole insulation against ground resistance, insulating resistance value situation of change over the ground is converted into the variation of voltage, and pass through resistance R 6Enter the voltage window comparison circuit that double operational integrated circuit LM358 constitutes, judge comparison: 1. 7 pin of (greater than 2mV) LM358 just have also driving LED of voltage output when comparing voltage value that the magnitude of voltage of its input sets greater than 6 pin of LM358 1Luminous, indication plus earth; 2. 1 pin of (less than 2mV) corresponding LM358 just has voltage output and driving LED when comparison value that the magnitude of voltage of its input sets less than 3 pin of LM358 2Luminous, the indication minus earth; As long as 7 or 1 pin of LM358 has voltage output, correspondingly D 6Or D 7With regard to forward conduction, pass through resistance R 9Drive triode Q saturation conduction, behind the triode Q saturation conduction, just have electric current to pass through in the coil of relay J, the relay J coil electricity produces magnetic field and drives armature work, the contact of relay close and, from switching signal of switching signal output b, c output.
Adjustment method:, choose corresponding best insulating resistance value lower limit, the insulating resistance value of just reporting to the police according to applied electric pressure, accordingly come analog bus insulation against ground resistance value with an identical fixed resistance, one end fixedly connects earth terminal, other end difference: 1. connect anode, adjust RW 1Make the 7 pin output high level of IC, 2. connect negative terminal and adjust RW 2Make the 1 pin output high level of IC, adjust twice repeatedly, can drop into actual motion.

Claims (1)

1. dc insulating monitoring relay comprises: shell, and panel, direct current supply positive pole and negative pole, earth electrode a and two switching signal output b, c, its feature part is also to comprise:
An insulation monitoring testing circuit is by diode D 1～D 4, resistance R 1～R 5Form; Diode D 1～D 4Form bridge rectifier, resistance R 1A terminating diode D 1Anode and diode D 2The tie point of negative electrode, another termination direct current supply positive pole, diode D 3Anode and diode D 4Negative electrode meets earth electrode a, diode D after linking to each other 1, D 3The negative electrode back connecting resistance R that links to each other 2An end, diode D 2, D 4The anode back connecting resistance R that links to each other 3An end, resistance R 2, R 3The other end back connecting resistance R that links to each other 4An end, resistance R 4Other end connecting resistance R 5An end, resistance R 5The negative pole of another termination direct current supply;
Power supply circuits are by diode D 5, resistance R 10, voltage-stabiliser tube DW forms; Diode D 5Anode meet direct current supply positive pole, negative electrode connecting resistance R 10One end, resistance R 10The positive pole of another termination voltage-stabiliser tube DW, voltage-stabiliser tube DW negative pole connects the direct current supply negative pole;
An alarm parameters initialization circuit is by adjustable resistance RW 1, RW 2, resistance R 7Form adjustable resistance RW 1A terminating resistor R 10With the tie point of voltage-stabiliser tube DW positive pole, other end connecting resistance R 7An end, adjustable resistance RW 2A terminating resistor R 7The other end, another termination direct current supply negative pole;
A window comparator circuit is by resistance R 6Form connecting resistance R after 2 pin of integrated circuit (IC) are connected with 5 pin with double operational integrated circuit (IC) (LM358) 6An end, resistance R 6Other end connecting resistance R 4With R 5Tie point, 3 pin of integrated circuit (IC) meet adjustable resistance RW 2Adjustable end, 6 pin meet adjustable resistance RW 1Adjustable end, 8 pin connecting resistance R 10Connect the direct current supply negative pole with tie point, 4 pin of voltage-stabiliser tube DW positive pole;
A ground connection indicating circuit is by resistance R 8, LED 1And LED 2Form; Light-emitting diodes LED 1Anode connect 7 pin of integrated circuit (IC), LED 2Anode connect 1 pin of integrated circuit (IC), LED 1With LED 2The negative electrode back connecting resistance R that links to each other 8An end, R 8Another termination direct current supply negative pole;
A switching signal output circuit is by diode D 6, D 7, D 8, resistance R 9, triode Q and relay J are formed; Diode D 6Anode connect 7 pin of integrated circuit (IC), diode D 7Anode connect 1 pin of integrated circuit (IC), diode D 6With D 7The negative electrode back connecting resistance R that links to each other 9An end, R 9The base stage of another termination triode Q, relay J one terminating diode D 8Negative electrode and direct current supply positive pole, another terminating diode of relay J D 8Anode and the collector electrode of triode Q, the emitter of triode Q connects the direct current supply negative pole.
CN 00223153 2000-05-30 2000-05-30 DC insulation supervisory relay Expired - Fee Related CN2427885Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 00223153 CN2427885Y (en) 2000-05-30 2000-05-30 DC insulation supervisory relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 00223153 CN2427885Y (en) 2000-05-30 2000-05-30 DC insulation supervisory relay

Publications (1)

Publication Number Publication Date
CN2427885Y true CN2427885Y (en) 2001-04-25

Family

ID=33587747

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 00223153 Expired - Fee Related CN2427885Y (en) 2000-05-30 2000-05-30 DC insulation supervisory relay

Country Status (1)

Country Link
CN (1) CN2427885Y (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102830334A (en) * 2012-08-12 2012-12-19 江苏旭源科技有限公司 Novel photovoltaic grid-connected inverter insulation detection circuit and detection method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102830334A (en) * 2012-08-12 2012-12-19 江苏旭源科技有限公司 Novel photovoltaic grid-connected inverter insulation detection circuit and detection method thereof
CN102830334B (en) * 2012-08-12 2015-05-20 江苏旭源科技有限公司 Novel photovoltaic grid-connected inverter insulation detection circuit and detection method thereof

Similar Documents

Publication Publication Date Title
CN101059548A (en) Magnet coil break detection circuit
CN109031107B (en) Electronic auxiliary contact circuit for detecting on-off of high-voltage relay contact
CN103346044B (en) With the low-voltage circuit breaker of connecting terminal block temperature rise monitoring device
CN212303558U (en) Electromagnetic relay contact or coil abnormity monitoring circuit
CN101009425A (en) Over current protection system of the breaker and its operating method
CN2427885Y (en) DC insulation supervisory relay
CN105182165B (en) A kind of mobile power supply ground wire connection status monitors in real time and the system of fault location
CN101411929B (en) Double-wire system special module
CN112485666A (en) Join in marriage intelligent fortune of net direct current circuit breaker many parameters and maintain detection device
CN209167865U (en) A kind of On-off signal detection circuit and monitoring system
CN208636402U (en) Detect the electron assistant contact circuit of high-voltage relay contact on-off
CN110198078A (en) A kind of communication power supply monitoring method based on dry contact
CN212845894U (en) Real-time monitoring circuit for line condition of user electric meter
CN212845895U (en) Voltage comparator module circuit in short-circuit fault warning device of ammeter
CN201022145Y (en) Over current protection system for breaker
CN201729893U (en) Aluminum electrolytic cell controller potline current signal monitor
CN209086383U (en) Automobile air conditioner electromagnetic clutch coil freewheeling diode detection device
CN2694288Y (en) Switch cabinet leakage current checking and warning device
CN2564825Y (en) Detector for state of electromagnetic valve
CN218160872U (en) Intelligent short circuit grounding wire device
CN212845893U (en) Short-circuit fault warning device for RS485 branch line of electric meter
CN212258913U (en) Differential amplifier module circuit in short-circuit fault warning device of ammeter
CN216816881U (en) Contactor function detection device
CN105070087B (en) Intelligent traffic signal failure detector circuit
CN204719123U (en) A kind of overvoltage undervoltage detection circuit

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee