CN108983078B - Relay matching resistance selection device and method - Google Patents
Relay matching resistance selection device and method Download PDFInfo
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- CN108983078B CN108983078B CN201710401067.XA CN201710401067A CN108983078B CN 108983078 B CN108983078 B CN 108983078B CN 201710401067 A CN201710401067 A CN 201710401067A CN 108983078 B CN108983078 B CN 108983078B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 57
- 238000010187 selection method Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention provides a relay matching resistance selection device and a method, wherein the action voltage range of a relay to be tested is divided into m gears, and m is a positive integer greater than 1; calculating the matching resistance corresponding to each gear selection according to the action voltage range of the relay to be tested corresponding to each gear; selecting one gear, connecting a corresponding matching resistor with a test power supply and a coil part of the relay to be tested in series to form a test loop, and detecting whether a contact part of the relay to be tested acts; if the contact part of the relay to be tested acts, the matching resistance corresponding to the gear is the matching resistance required by the relay to be tested; otherwise, switching to any other gear to judge again until the matching resistance required by the relay to be tested is determined. According to the technical scheme provided by the invention, the required matching resistor can be directly selected according to the potential signal of the relay contact part, so that the selection efficiency of the matching resistor of the relay can be improved.
Description
Technical Field
The invention belongs to the technical field of relay detection, and particularly relates to a relay matching resistance selection device and method.
Background
As the most basic actuator, a relay plays a crucial role in a relay protection device. The relay in the relay protection equipment is generally a small electromagnetic relay, which comprises an iron core, a coil, an armature, a contact spring and the like, wherein after a certain voltage is applied to two ends of the coil, current flows in the coil, the current generates an electromagnetic effect in the coil to generate magnetic force, and the contact is driven to be opened or closed. Since the contact portion and the coil portion of the relay are separately provided and the operation of the contact can be controlled by the coil, the strong current can be controlled by the weak current, and the safety in the operation to the strong current is increased.
The relay of the relay protection equipment is generally arranged in an operation box, 220V/100V direct current voltage provided by a direct current power supply screen in the operation box is applied to two ends of a relay coil after voltage division, and when the voltage at two ends of the relay coil reaches an action voltage value, a contact of the relay acts. In an actual circuit, the relay is arranged in such a manner that matching resistors R1 and R2 are connected in series in the coil part as shown in fig. 1, thereby controlling the voltage across the coil part of the relay.
In the operation box, a plurality of relays are provided, and the operating voltage of each relay is different, and even if the relay has a nominal fixed operating voltage value, the actual operating voltage value of the relay may be different, for example, the actual operating voltage value of the relay having a nominal operating voltage value of 24V may be about 10V. Although companies require that the relay contact portion of the relay protection device should operate at a voltage between 55% and 70% of its rated operating voltage, i.e., the relay contact portion should not operate when the voltage across the coil portion of the relay is less than 55% of the rated operating voltage of the relay, the relay contact portion must operate when the voltage across the coil portion of the relay is greater than 70% of the rated operating voltage of the relay. Therefore, the relay needs to be tested before it is installed to determine the resistance values of the matched resistors R1 and R2.
At present, the method for determining the resistance values of the matching resistors R1 and R2 mainly detects the action voltage of the relay, and then calculates the resistance values of the matching resistors R1 and R2 according to the action voltage of the relay. Although this method can select appropriate matching resistors R1 and R2, it is troublesome and inefficient to repeatedly adjust the voltage of the coil part of the relay when detecting the voltage of the relay and to calculate the resistance value of the matching resistor when detecting the operating voltage of the relay.
Disclosure of Invention
The invention aims to provide a relay matching resistance selection device and method, which are used for improving the efficiency of selecting a matching resistance for a relay.
A relay matching resistance selection device includes a processor, a contact test part and a coil test part;
the contact test part is used for connecting a contact part of the relay to be tested, detecting an action signal of the relay contact part and transmitting the action signal to the processor;
the coil testing part comprises a testing power supply and a matching resistance selection module; the matching resistor selection module comprises m parallel test branches, a corresponding matching resistor is connected in series on each test branch, and each matching resistor divides the action voltage range of the relay to be tested into m gears and is determined according to the action voltage range of each gear; each test branch is connected with the test power supply and used for being connected with the coil part of the relay to be tested so as to form a corresponding test loop; m is a positive integer greater than 1;
the processor is used for sequentially gating all the test loops and determining the matching resistance required by the relay to be tested according to the action signal of the contact part of the relay to be tested.
Furthermore, each test branch is formed by connecting the corresponding matching resistor with a switch tube in series, and the processor is connected with the control end of each switch tube in a control mode.
The device further comprises a selection switch, wherein one end of the selection switch is connected with the test power supply, the other end of the selection switch is used for being connected with one end of the coil part of at least one relay to be tested, and the matching resistance selection module is used for being connected with the other end of the coil part of each relay to be tested.
Furthermore, the contact test part comprises a direct current power supply, the direct current power supply is connected with the contact part of the relay to be tested through a pull-up resistor and then grounded, and the processor is used for detecting potential signals of the contact part of the relay.
A relay matching resistance selection method comprises the following steps:
(1) dividing the action voltage range of the relay to be tested into m gears, wherein m is a positive integer greater than 1;
(2) calculating the matching resistance corresponding to each gear selection according to the action voltage range of the relay to be tested corresponding to each gear;
(3) selecting one gear, connecting a corresponding matching resistor with a test power supply and a coil part of the relay to be tested in series to form a test loop, and detecting whether a contact part of the relay to be tested acts; if the contact part of the relay to be tested acts, the matching resistance corresponding to the gear is the matching resistance required by the relay to be tested; otherwise, switching any other gear to judge again until the matching resistance required by the relay to be tested is determined.
Furthermore, the gears are sequentially selected from small to large according to the action voltage range of the relay to be tested corresponding to each gear.
The invention has the beneficial effects that: according to the technical scheme provided by the invention, the action voltage range of the relay to be tested is divided into m gears, the corresponding matching resistor is determined according to the action voltage range corresponding to each gear, then the test power supply, the coil part of the relay to be tested and the matching resistor corresponding to one gear are connected in series to form a test loop, and finally the matching resistor required by the relay to be tested can be directly determined according to the potential signal of the contact part of the relay to be tested. According to the technical scheme provided by the invention, the voltage applied to the two ends of the relay to be tested does not need to be adjusted repeatedly, and the resistance value of the matching resistor does not need to be calculated according to the action voltage of the relay to be tested, so that the workload of selecting the matching resistor is reduced, and the efficiency of selecting the matching resistor of the relay to be tested is improved.
Drawings
FIG. 1 is an operation circuit of a relay and a resistor in a relay protection device;
fig. 2 is a schematic diagram of a relay matching resistance selection device in an embodiment.
Detailed Description
The invention aims to provide a relay matching resistance selection device and method, which are used for improving the efficiency of selecting a matching resistance for a relay.
The invention provides a relay matching resistance selection method, which comprises the following steps:
(1) dividing the action voltage range of the relay to be tested into m gears, wherein m is a positive integer greater than 1;
(2) calculating the matching resistance corresponding to each gear selection according to the action voltage range of the relay to be tested corresponding to each gear;
(3) selecting one gear, connecting a corresponding matching resistor with a test power supply and a coil part of the relay to be tested in series to form a test loop, and detecting whether a contact part of the relay to be tested acts; if the contact part of the relay to be tested acts, the matching resistance corresponding to the gear is the matching resistance required by the relay to be tested; otherwise, switching any other gear to judge again until the matching resistance required by the relay to be tested is determined.
The following further describes embodiments of the present invention with reference to the drawings.
The method comprises the following steps:
the embodiment provides a relay matching resistance selection method, which is used for selecting a matching resistance for a relay. For different relays, the action voltages of the relays may be different, and the resistance values of the required matching resistors are also different, so that the relays to be tested need to be graded. If the minimum value allowed by the action voltage of the relay is UJLMaximum value is UJHDividing the action voltage range of the relay to be tested into m gears, wherein m is an integer greater than 1:
action voltage range of 1 st gear relayEnclosing: u shapeJL～UJL*(1+10％)；
Operating voltage range of the 2 nd gear relay: u shapeJL*(1+10％)～UJL*(1+20％)；
By analogy, the action voltage range of the mth gear relay is as follows: u shapeJL*(1+(m-1)*10％)～UJH。
And after grading the action voltage of the relay to be tested, selecting a corresponding matching resistor for each grade. Suppose the rated voltage of the protection device is UeThe minimum operating voltage of the S-th gear is USLMaximum operating voltage of USHThe required matching resistor has a resistance value of R, and if the relay coil has a resistance value of RjThen, according to ohm's law, the resistance R of the matching resistor of this stage should satisfy the following relationship:
and then connecting the matching resistor corresponding to the 1 st gear with a test power supply and a coil part of the relay to be tested in series to form a test loop, and detecting whether a contact part of the relay to be tested acts. If the contact part of the relay to be tested acts, the action power supply of the relay to be tested belongs to the 1 st gear, and the matching resistance corresponding to the 1 st gear is the matching resistance required by the relay to be tested; and if the part of the relay contact to be tested does not act, the matching resistor is replaced by the matching resistor corresponding to the 2 nd gear. By analogy, if the contact part of the relay to be tested does not act when the matching resistor corresponding to the ith gear is connected into the test loop, but the contact part of the relay to be tested acts when the matching resistor corresponding to the (i + 1) th gear is connected into the test loop, the matching resistor corresponding to the gear is judged to be the matching resistor required by the relay to be tested. The i is an integer greater than 1 and less than m.
As another embodiment, the present invention may beSetting the 0 th gear of the relay action voltage to be tested, wherein the action voltage of the relay to be tested corresponding to the gear is less than UJLAnd if the action voltage of the relay to be tested is detected to belong to the 0 th gear, the action voltage of the relay to be tested is judged to be too small.
In another embodiment, if the contact of the relay still does not operate when the test loop is connected to the matched resistor corresponding to the mth gear, the operating voltage of the relay to be tested is judged to be too large.
The embodiment of the device is as follows:
the embodiment provides a relay matching resistance selection device, which is used for selecting a matching resistance for a relay. The relay matching resistance selection device provided in this embodiment, that is, a device for implementing the relay matching resistance selection method provided in the above method embodiment, as shown in fig. 2, includes a processor MCU, a contact test part, and a coil test part.
The contact testing part comprises a direct current power supply VCC, the direct current power supply VCC is connected with the contact part of the relay to be tested through a pull-up resistor and then is grounded, for example, the direct current power supply VCC is connected with the contact part of the relay to be tested through a pull-up resistor Rk1The contact part J1B of the relay J1 to be tested is connected through a pull-up resistor Rk2And a contact part J2B of the relay J2 to be tested is connected. And the processor MCU is connected with the potentials of the connection parts of the pull-up resistors and the corresponding to the contact points of the relay to be tested, and judges whether the contact point part corresponding to the relay to be tested acts or not according to the potentials.
The coil testing part comprises a testing power supply which is respectively connected with the coil part J1A of each relay J1 to be tested to the coil part JnA of the relay Jn through a triode Q1 to a triode Qn. In the embodiment, the triodes Q1 to Qn are used as controllable switches, the collector of each triode is connected with a test power supply, the emitter is connected with the coil part of the corresponding relay to be tested, and the processor MCU controls the base of each triode, controls the triggering of each triode, and selects the relay to be tested for testing. The coil testing part also comprises a matching resistance selection module which is formed by connecting m testing branches in parallel, each testing branch corresponds to the action voltage gear of the relay to be tested, and the ith testing branch is matched with the ith gearResistor and triode Q'iIs connected in series to form a triode Q'iThe collector of the relay is connected with the coil part of each relay to be tested, and the emitter is connected with the matching resistor of the corresponding gear. The processor MCU is connected with the base electrodes of the triodes in the testing branches, and the matching resistors are selected to be connected with the coil part of the relay to be tested in series by controlling the triggering of the triodes.
When the relay to be tested is measured, the processor MCU firstly selects the relay to be tested from the triodes Q1 to Qn, for example, the relay J1 to be tested is selected through the trigger triode Q1, and the relay J2 to be tested is selected through the trigger triode Q2. After the relay to be tested is selected, the processor MCU sequentially controls the triodes Q'1To Q'mTriggering, selecting the matching resistor corresponding to the corresponding gear, and if the triode Q1 is triggered, connecting the test power supply, the coil of the selected relay to be tested and the matching resistor of the 1 st gear in series to form a test loop, and detecting whether the potential of the contact part of the selected relay to be tested changes by the MCU. If the conversion occurs, the contact part of the selected relay to be tested acts, the action voltage of the selected relay to be tested is judged to belong to the 1 st gear, and the matching resistance of the relay to be tested is the matching resistance corresponding to the 1 st gear; if the potential of the selected relay contact part to be tested does not change, the contact of the selected relay to be tested does not act, and the triode Q 'is turned off at the moment'1Of flip-flop transistor Q'2The processor MCU detects the potential of the contact part of the selected relay to be tested, and so on, if the contact of the selected relay to be tested is in the trigger triode Q'iThe transistor Q 'is not activated at all'i+1And if the relay to be tested does not work, judging that the action voltage of the selected relay to be tested belongs to the (i + 1) th grade, and the matching resistance of the relay to be tested is the matching resistance corresponding to the (i + 1) th grade.
In this embodiment, in order to more accurately obtain the matching resistance required by each relay to be tested, the matching resistance corresponding to each gear is set to be the same as the actual working condition of the relay to be tested, and two resistors are connected in series, for example, the matching resistance corresponding to the first gear is Ra1And Ra2The matching resistance corresponding to the second gear is Rb1And Rb2And the like.
Claims (6)
1. A relay matching resistance selection device is characterized by comprising a processor, a contact testing part and a coil testing part;
the contact test part is used for connecting a contact part of the relay to be tested, detecting an action signal of the relay contact part and transmitting the action signal to the processor;
the coil testing part comprises a testing power supply and a matching resistance selection module; the matching resistor selection module comprises m parallel test branches, a corresponding matching resistor is connected in series on each test branch, and each matching resistor divides the action voltage range of the relay to be tested into m gears and is determined according to the action voltage range of each gear; each test branch is connected with the test power supply and used for being connected with the coil part of the relay to be tested so as to form a corresponding test loop; m is a positive integer greater than 1;
the processor is used for sequentially gating all the test loops and determining the matching resistance required by the relay to be tested according to the action signal of the contact part of the relay to be tested.
2. The relay matching resistance selection device according to claim 1, wherein each test branch is formed by connecting a corresponding matching resistance with a switch tube in series, and the processor is connected with the control end of each switch tube in a control manner.
3. The relay matching resistance selection device as claimed in claim 1, further comprising a selection switch, wherein one end of the selection switch is connected to the test power supply, the other end of the selection switch is used for being connected to one end of the coil part of at least one relay to be tested, and the matching resistance selection module is used for being connected to the other end of the coil part of each relay to be tested.
4. The relay matching resistance selection device as claimed in claim 1, wherein the contact testing part comprises a dc power supply, the dc power supply is connected to the contact part of the relay to be tested through a pull-up resistor and then grounded, and the processor is configured to detect a potential signal of the contact part of the relay.
5. A relay matching resistance selection method is characterized by comprising the following steps:
(1) dividing the action voltage range of the relay to be tested into m gears, wherein m is a positive integer greater than 1;
(2) calculating the matching resistance corresponding to each gear selection according to the action voltage range of the relay to be tested corresponding to each gear;
(3) selecting one gear, connecting a corresponding matching resistor with a test power supply and a coil part of the relay to be tested in series to form a test loop, and detecting whether a contact part of the relay to be tested acts; if the contact part of the relay to be tested acts, the matching resistance corresponding to the gear is the matching resistance required by the relay to be tested; otherwise, switching to any other gear to judge again until the matching resistance required by the relay to be tested is determined.
6. The method for selecting the matched resistor of the relay according to claim 5, wherein the gears are sequentially selected from small to large according to the action voltage range of the relay to be tested corresponding to each gear.
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| CN111077470B (en) * | 2019-12-26 | 2021-06-18 | 北汽福田汽车股份有限公司 | Power supply gear function testing system and method |
| CN112379615B (en) * | 2020-10-27 | 2022-05-20 | 许继集团有限公司 | Circuit and method for detecting chip fault of open-loop bus transceiver |
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