CN109142993A - A kind of multifunction insulating detector suitable for DC power system - Google Patents
A kind of multifunction insulating detector suitable for DC power system Download PDFInfo
- Publication number
- CN109142993A CN109142993A CN201810831205.2A CN201810831205A CN109142993A CN 109142993 A CN109142993 A CN 109142993A CN 201810831205 A CN201810831205 A CN 201810831205A CN 109142993 A CN109142993 A CN 109142993A
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- module
- leakage current
- sampling
- bridge circuit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of multifunction insulating detectors suitable for DC power system, it is characterised by comprising: MCU main control module, balanced bridge circuit and its sampling module, uneven bridge circuit and its sampling module, uneven bridge switching module, DC leakage current amplification scurry into measurement module, communication module and magnetic holding rhabdion point module with sampling module, branch leakage current inspection switching module, of ac；The output end that balanced bridge circuit and its sampling module, uneven bridge circuit and its sampling module, DC leakage current amplification scurry into measurement module with sampling module, of ac is connect with MCU main control module；Uneven bridge switching module, branch leakage current inspection switching module, magnetic keep rhabdion point module to connect with the output end of MCU main control module；MCU main control module is also connected with communication module.The present invention accurate detection can go out the voltage-to-ground value of bus and its branch in real time, to realize the detection of resistance value over the ground by the solution of equilibrium equation and uneven equation.
Description
Technical field
The present invention relates to DC power system detection technique fields, and in particular to a kind of suitable for the more of DC power system
Functional insulation detector, for DC power system bus and the detection of branch insulation state real-time online and multi-power supply system
Between detection that talking over the wire mutually.
Background technique
The DC power supply of substation as electric equipments power supply and control signal power supply, be one very
Huge multiple-limb supply network.Under normal circumstances, one point earth has no effect on the operation of direct current system, but if cannot be fast
Speed finds earth fault and is repaired, but occur another point ground fault, it is possible to cause signal circuit, control loop,
The malfunction of the devices such as relay protection to destroy the safe operation of electric system, or even causes large-scale power outage.Cause
This needs to detect the dielectric strength of bus and branch in real time to ensure the reliable and stable work of DC power-supply system, so as to
Real grounding point in direct current system can accurately and timely be informed out when the decline of line insulation performance or even line-to-ground.
Currently, there are multiple powersupply systems such as DC power system and AC power supply system in substation.Normal work
It is mutually indepedent between two kinds of systems when making, it is independent of each other；But it causes exchange to scurry into direct current system due to various reasons, causes
The tripping accident of malfunction or the protection of switch disconnector.For this purpose, capableing of the friendship in the monitoring DC power system of real-time online
Flee the important requirement for becoming DC power system stable operation into function.
Summary of the invention
It is suitable in view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that proposing one kind
The multifunction insulating detector of DC power system.
In order to achieve the above object, the present invention is achieved by the following scheme:
A kind of multifunction insulating detector suitable for DC power system characterized by comprising MCU main control module, balance
Bridge circuit and its sampling module, uneven bridge circuit and its sampling module, uneven bridge switching module, DC leakage current amplification with
Sampling module, branch leakage current inspection switching module, of ac scurry into measurement module, communication module and magnetic and keep rhabdion point mould
Block；
The balanced bridge circuit and its sampling module, uneven bridge circuit and its sampling module, DC leakage current amplification and sampling
The output end that module, of ac scurry into measurement module is connect with MCU main control module；The imbalance bridge switching module, branch leakage
Electric current inspection switching module, magnetic keep rhabdion point module to connect with the output end of MCU main control module；The MCU main control module is also
Connection communication module.
Further, the CPU main control module uses the processor of ARM-M3 STM32F103C5T model.
Further, the balanced bridge circuit and its sampling module include two substitutional resistances, two of them substitutional resistance
It is connected between positive bus-bar negative busbar and the earth and constitutes balanced bridge circuit；The imbalance bridge circuit and its sampling module packet
Two non-equivalence resistance are included, positive bus-bar, negative busbar and the earth are connected to by the first high-voltage switch gear and the first high-voltage switch gear respectively
Between.
Further, the of ac scurry into measurement module include isolation capacitance, it is current-limiting resistance, current transformer, active
Amplifier；The anode of the output end connection isolation capacitance of the positive bus-bar, the cathode of the isolation capacitance by current-limiting resistance with
The input terminal of current transformer connects, and the output end of the current transformer connects activated amplifier.
Further, the DC leakage current amplification and sampling module include leakage current transformer, sampling resistor and amplification
Device；The input terminal of the leakage current transformer is connect with DC bus branch, and the output end connection of the leakage current transformer is adopted
Sample resistance and amplifier.
Further, described, branch leakage current inspection switching module on each road by being arranged binary channels high voltage
Mosfet carries out the switching of leakage current numerical value.
The medicine have the advantages that
1, the present invention can real-time online detection DC power-supply system in the insulating resistance value of DC bus and branch, real-time monitoring
The ac voltage scurried into direct current system, and more detectors is facilitated to carry out networking detection multi-branch circuit power system.Measurement
Multifunction insulating detector；The detector passes through the integrated complementary cross detection of balanced bridge circuit and uneven bridge circuit, in real time
Accurate detection goes out the voltage-to-ground value of bus and its branch, to pass through the solution realization pair of equilibrium equation and uneven equation
The detection of ground resistance value.
2, the detector can effectively monitor the exchange numerical quantity scurried into direct current system；DC bus-bar voltage is through excessively high
Retain AC compounent after pressure isolation capacitance, which passes through active turn through operational amplifier after current transformer isolation
It changes voltage signal into, send to main control module and carry out sampled measurements.
3, when needing multiple detectors on single bus in the present invention, by toggle switch formulate a certain detector carry out it is flat
The switching of Heng Qiao, to avoid multiple detectors while switching and change bus insulation intensity.Which realization is simple and reliable, surely
It is qualitative good.
4, the present invention in using magnetic keep rhabdion point export, it is ensured that insulation fault in the case where detector power down,
It still is able to keep alarm output signal, in case background devices monitor, improves the reliability of Insulation monitoring.
Detailed description of the invention
Fig. 1 is a kind of multifunction insulating detector structure chart suitable for DC power system proposed by the present invention；
Fig. 2 is insulation tester line insulation resistance detection schematic diagram provided by the invention；
Fig. 3 is that the of ac that invention proposes scurries into measurement module circuit diagram；
Fig. 4 is the DC bus-bar voltage sampling principle figure proposed by the present invention；
Fig. 5 is the DC leakage current amplification proposed by the present invention and sampling module circuit diagram；
Fig. 6 is the branch leakage current inspection switch module circuit diagram proposed by the present invention.
Specific embodiment
The specific embodiment of the invention is described with reference to the accompanying drawings and embodiments:
The present invention analyse in depth standardize behavioural norm, work ticket system, work permit, monitoring, termination system on the basis of,
It is collected evidence using each link of the technologies such as video compress and transmission technology, image recognition technology, workflow to work ticket process
And supervision, make security organization measure visualization, intelligent and control real time implementation, further promotes the security management and control of work ticket system
Effect.
It is a kind of multifunction insulating detector structure chart suitable for DC power system proposed by the present invention referring to Fig. 1.
As shown in Figure 1, a kind of multifunction insulating detector suitable for DC power system, comprising: MCU main control module,
Balanced bridge circuit and its sampling module, uneven bridge circuit and its sampling module, uneven bridge switching module, DC leakage are banished
Measurement module, communication module and magnetic are scurried into sampling module, branch leakage current inspection switching module, of ac greatly and keeps rhabdion point
Module；
The balanced bridge circuit and its sampling module, uneven bridge circuit and its sampling module, DC leakage current amplification and sampling
The output end that module, of ac scurry into measurement module is connect with MCU main control module；The imbalance bridge switching module, branch leakage
Electric current inspection switching module, magnetic keep rhabdion point module to connect with the output end of MCU main control module；The MCU main control module is also
Connection communication module.
Detector realizes bus positive and negative anodes pair by the complementary detection of DC bus balanced bridge circuit and uneven bridge circuit
The measurement of ground voltage value, and branch leakage current sampled value is cooperated to realize the insulation against ground resistance measurement to bus and branch；It is logical
It crosses high pressure isolation capacitance and matches amplifier circuit, realize the measurement that bus of ac is scurried into.It is realized by toggle switch single
On root bus between multiple detectors uneven bridge circuit single switching, avoid multiple detectors while carrying out uneven bridge
Switching and the dielectric strength for changing bus.Local networking is carried out by CAN bus and transfers information to backstage.Meanwhile making
Rhabdion point is kept to realize the output alerted with magnetic.Balanced bridge circuit is separately connected positive bus-bar, negative mother by equivalent precision resister
Line and the earth, uneven bridge circuit are carried out the switching of uneven resistor bridge by master controller by photoelectrical coupler.
Core of the MCU main control module as system, using the processor of ARM-M3 STM32F103C5T model.It is main
Function has: in real time detection balanced bridge circuit built with unbalanced circuit DC bus voltage-to-ground, branch leakage current, exchange
The amount of scurrying into；Control switching and the branch leakage current inspection switching of uneven bridge；More detector networkings and with backstage CAN communication；Control
Magnetic processed keeps the output of rhabdion point.
The present invention can real-time online detection DC power-supply system in the insulating resistance value of DC bus and branch, in real time prison
The ac voltage scurried into direct current system is surveyed, and more detectors is facilitated to carry out networking detection multi-branch circuit power system.Measurement
Multifunction insulating detector.The detector passes through the integrated complementary cross detection of balanced bridge circuit and uneven bridge circuit, real
When accurate detection go out the voltage-to-ground value of bus and its branch, so that the solution by equilibrium equation and uneven equation is realized
The detection of resistance value over the ground.Meanwhile the detector can effectively monitor the exchange numerical quantity scurried into direct current system.
It referring to fig. 2, is insulation tester line insulation resistance detection schematic diagram provided by the invention.
As shown in Fig. 2, two equivalence high-precision power resistance Rb as balance resistor bridges be connected to positive bus-bar MX+,
Between negative busbar MX- and the earth, two non-equivalence high-precision power resistance Rn+ and Rn- pass through respectively as uneven resistor bridge
First high-voltage switch gear K1 and the first high-voltage switch gear K2 are connected between positive bus-bar, negative busbar and the earth, form uneven bridge circuit,
There is master controller to need to carry out the switching of unbalanced resistance according to acquisition.
Fig. 3 is participated in, the of ac proposed for invention scurries into measurement module circuit diagram；
As shown in figure 3, it includes isolation capacitance, current-limiting resistance, current transformer, activated amplifier that of ac, which scurries into measurement module,；
The anode of the output end connection isolation capacitance of the positive bus-bar, the cathode of the isolation capacitance pass through current-limiting resistance and Current Mutual Inductance
The input terminal of device connects, and the output end of the current transformer connects activated amplifier.High_voltage isolation capacitor will be in direct current system
DC quantity isolation, retain AC compounent, after resistance current limliting, after thering is current transformer to do and be isolated, by active amplification generation
Corresponding alternating current voltage component.Acquisition alternating current voltage component, you can learn that the of ac amplitude scurried into direct current system.
It referring to fig. 4, is the DC bus-bar voltage sampling principle figure proposed by the present invention.DC bus-bar voltage first passes through electricity
R99 and resistance R90 partial pressure is hindered, resistance R89 current limliting is then passed through, voltage follow is carried out by operational amplifier MCP601, to improve
Then its input impedance carries out data sampling by MCU main control module.
Referring to Fig. 5, for the DC leakage current amplification proposed by the present invention and sampling module circuit diagram；
As shown in figure 5, DC leakage current amplification and sampling module include leakage current transformer, sampling resistor and amplifier；It is described
The input terminal of leakage current transformer is connect with DC bus branch, the output end of leakage current transformer connection sampling resistor and
Amplifier.Firstly, branch leakage current is done signal isolation by leakage current transformer, stream pressure is then carried out by sampling resistor and is turned
It changes, and carries out voltage follow by operational amplifier, data sampling is carried out by master controller later.
It is the branch leakage current inspection switch module circuit diagram proposed by the present invention referring to Fig. 6；
As shown in fig. 6, branch leakage current inspection switching module by each road be arranged binary channels high voltage mosfet into
The switching of row leakage current numerical value.Direct current system is since the number of branches of bus are more, and each direct current channel is likely to generate
Leakage current.Therefore, it is necessary to carry out circulating sampling by leakage current of the simple and practical mode to each branch.Branch leakage current follows
Ring cutting, which changes, can be solved this problem.
It scurries into mutually and is detected for alternating current-direct current existing for multi-power system simultaneously, and under detector power-down conditions
It still is able to keep outputting alarm signal.The detector can increase substantially the stability and reliability of DC power-supply system.
The sampling of branch leakage current is that leakage current is changed into voltage value by each branch DC leakage current transformer sampled resistance
Afterwards, analog-to-digital conversion is carried out after operational amplifier tuning.High_voltage isolation capacitor filters out bus DC voltage, ac high voltage
By carrying out sampled measurements after electric resistance partial pressure and operational amplifier tuning after isolation capacitance.It is more to avoid when detector networking
A detector carries out the switching of uneven bridge simultaneously and leads to the change of bus insulation intensity, passes through toggle switch between detector
Realize a certain moment, the switching that an only detector carries out uneven bridge.Alarm output is realized by magnetic latching relay, can be protected
Card still is able to keep exporting by alarm signal in the case where detector power down, improves detection reliability.
It is used to detect DC power system bus in the present invention and the principle of branch insulation intensity is as shown in Figure 2.Balance bridge
Between positive bus-bar, negative busbar and equivalent power resistor is accessed in circuit；In uneven bridge circuit between positive bus-bar, negative busbar simultaneously
Access the power resistor of non-equivalence.In this way, striving common to DC power system two classes ground connection: single-end earthed and two-terminal-grounding,
Balance bridge equation can be solved to the voltage of the earth by measurement positive bus-bar, negative busbar respectively and uneven bridge equation obtains absolutely
Edge resistance value.Steps are as follows for concrete implementation:
Step 1: disconnect the first high-voltage switch gear K1 and the second high-voltage switch gear K2 in uneven bridge circuit, measure respectively MX+ and
The voltage of MX-, is denoted as Vb+ and Vb-.
Step 2: if the voltage of MX+ and MX- is unequal, it can be according to balance bridge equation:With, positive bus-bar, negative busbar are to ground resistance Rx and Ry when solving single-end earthed respectively.
Step 3: then can determine whether out: positive bus-bar, negative busbar are infinite to ground resistance if MX+ is equal with the voltage of MX-
Big or positive bus-bar, negative busbar two-terminal-grounding.Further it can judge which is actually belonged to by the switching of uneven bridge circuit
Class situation.
Step 4: imbalance bridge circuit the first high-voltage switch gear K1 is closed, the second high-voltage switch gear K2 is disconnected, and measures busbar voltage
Vb+ and Vb-.Had by uneven bridge principle:。
Step 5: imbalance bridge circuit the first high-voltage switch gear K1 is disconnected, the second high-voltage switch gear K2 closure measures busbar voltage
Vb+ and Vb-.Had by uneven bridge principle:。
Step 6: solving the equation of the 4th step and the 5th step, positive bus-bar, negative busbar can be acquired to ground resistance Rx and Ry.
DC bus-bar voltage retains AC compounent after high_voltage isolation capacitor, the AC compounent by current transformer every
Active through operational amplifier is converted into voltage signal from it after, send to main control module and carries out sampled measurements.It is single in the present invention
When needing multiple detectors on root bus, the switching that a certain detector is balanced bridge is formulated by toggle switch, to avoid
Multiple detectors simultaneously switching and change bus insulation intensity.Which realization is simple and reliable, and stability is good.It is used in the present invention
Magnetic keeps the output of rhabdion point, it is ensured that and insulation fault still is able to keep alarm output signal in the case where detector power down,
In case background devices monitor, the reliability of Insulation monitoring is improved.
The preferred embodiment for the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes, these variations are related to the relevant technologies well-known to those skilled in the art, these both fall within the invention patent
Protection scope.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (6)
1. a kind of multifunction insulating detector suitable for DC power system characterized by comprising MCU main control module is put down
Weigh bridge circuit and its sampling module, uneven bridge circuit and its sampling module, uneven bridge switching module, DC leakage current amplification
Measurement module, communication module and magnetic, which are scurried into, with sampling module, branch leakage current inspection switching module, of ac keeps rhabdion point mould
Block；
The balanced bridge circuit and its sampling module, uneven bridge circuit and its sampling module, DC leakage current amplification and sampling
The output end that module, of ac scurry into measurement module is connect with MCU main control module；The imbalance bridge switching module, branch leakage
Electric current inspection switching module, magnetic keep rhabdion point module to connect with the output end of MCU main control module；The MCU main control module is also
Connection communication module.
2. a kind of multifunction insulating detector suitable for DC power system according to claim 1, which is characterized in that
The CPU main control module uses the processor of ARM-M3 STM32F103C5T model.
3. a kind of multifunction insulating detector suitable for DC power system according to claim 1, which is characterized in that
The balanced bridge circuit and its sampling module include two substitutional resistances, and it is negative that two of them substitutional resistance is connected to positive bus-bar
Balanced bridge circuit is constituted between bus and the earth；The imbalance bridge circuit and its sampling module include two non-equivalence resistance,
It is connected between positive bus-bar, negative busbar and the earth by the first high-voltage switch gear and the first high-voltage switch gear respectively.
4. a kind of multifunction insulating detector suitable for DC power system according to claim 1, which is characterized in that
It includes isolation capacitance, current-limiting resistance, current transformer, activated amplifier that the of ac, which scurries into measurement module,；The positive bus-bar
Output end connection isolation capacitance anode, the cathode of the isolation capacitance passes through the input terminal of current-limiting resistance and current transformer
The output end of connection, the current transformer connects activated amplifier.
5. a kind of multifunction insulating detector suitable for DC power system according to claim 1, which is characterized in that
The DC leakage current amplification and sampling module include leakage current transformer, sampling resistor and amplifier；The leakage current mutual inductance
The input terminal of device is connect with DC bus branch, the output end connection sampling resistor and amplifier of the leakage current transformer.
6. a kind of multifunction insulating detector suitable for DC power system according to claim 1, which is characterized in that
The branch leakage current inspection switching module carries out electric leakage fluxion by the way that binary channels high voltage mosfet is arranged on each road
Value switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810831205.2A CN109142993A (en) | 2018-07-26 | 2018-07-26 | A kind of multifunction insulating detector suitable for DC power system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810831205.2A CN109142993A (en) | 2018-07-26 | 2018-07-26 | A kind of multifunction insulating detector suitable for DC power system |
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Cited By (4)
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| CN111398739A (en) * | 2020-04-20 | 2020-07-10 | 广东电网有限责任公司梅州供电局 | Device and method for detecting abnormal parallel of direct current system for station |
| CN111600288A (en) * | 2020-05-14 | 2020-08-28 | 浙江达峰科技有限公司 | Back electromotive force discharge system and method for direct-current variable-frequency drum washing machine |
| CN111896854A (en) * | 2020-06-28 | 2020-11-06 | 杭州中恒电气股份有限公司 | Switching circuit and direct current system insulation detection device and method |
| CN113702871A (en) * | 2021-08-10 | 2021-11-26 | 国网河南省电力公司南阳供电公司 | Intelligent line finder for secondary direct-current power supply without power failure of transformer substation |
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| CN113702871A (en) * | 2021-08-10 | 2021-11-26 | 国网河南省电力公司南阳供电公司 | Intelligent line finder for secondary direct-current power supply without power failure of transformer substation |
| CN113702871B (en) * | 2021-08-10 | 2024-02-06 | 国网河南省电力公司南阳供电公司 | Intelligent line hunting device for uninterrupted secondary direct-current power supply of transformer substation |
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Application publication date: 20190104 |