JPS6162315A - Automatic inspecting device for protective relay unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to an automatic inspection system for a protection relay device that protects, for example, an electric power system.

[Prior art and its problems]

A protective relay device is always inactive and does not output anything unless there is an accident (failure) in the power system or equipment such as a generator that it protects. In terms of equipment? When a failure of the c711 itself causes a malfunction with respect to the device itself, the failure can be quickly discovered (detected) by monitoring the device output by appropriate means. When it affects the operating side, it is difficult to discover the failure until an accident occurs in the system, etc.

For this reason, in protective relay devices that require particularly high reliability, in order to detect failures in the device itself on the side of malfunction,
Automatic inspection? c2, every certain period of time (for example, 1 day to 3
1.6 Check whether the relay device responds normally by applying an input equivalent to 100% of the system or equipment from the current and voltage input terminals of the protection relay device (every 0 days).

A conventional automatic inspection device inspects a protective relay device as follows.

Figure 1 is a circuit diagram of a conventional automatic inspection line for a protective relay device. e '251 As shown in Figure 1, to inspect the protective relay 6, first connect the JH to the object to be protected, and then connect the
The circuit that gives a trip command (breaker open command) to the circuit (not shown) is locked by opening the contact 9^ of the trip coil 10, and the current and voltage that activates the protective relay device 6 are transferred to the circuit for inspection. Input from the power supply 3 to the protection relay device 6.

However, normally, the protective relay device 6
voltage is applied to. By switching the contact 3 - 3 , the inspection voltage from the power source 3 is applied to the protective relay device 6 instead of the voltage from the power system 101 . Also,
By closing the contact 3-2, the inspection current from the power supply 3 is added to the system current obtained by the main current transformer 1 as an auxiliary transformer.
jr, is superimposed via the device 4, and inputted to the protection relay device 6.

A relay device 6 that protects the current and voltage for such inspections.
The response result of the protective relay device 6 when desired is determined by the detection circuit 102 through the operation of the contacts 7 and 8 as the output of each protective relay element in the device 6 through the contact +1A of the auxiliary relay 11. In addition, contact point 9
Contact 9B closes when A opens. 3-1 is a current limiting resistor.

However, in automatic inspection devices such as 1 or more,
In order to check the functions of a plurality of protective relays in the protective relay device 6, different currents and different voltages must be sequentially applied to the protective relay device 6, possibly changing the phase between the currents and voltages. Must be,
Therefore, the device itself becomes complicated and expensive. In addition, since the current and voltage for inspection must be switched using an auxiliary relay, etc., the time required for one inspection becomes longer (for example, 3
0 seconds to 1 minute), reduce the reliability of the device, and if a system fault occurs during one inspection, the protection relay device should be returned to normal status (non-inspection state) immediately (for example, within loo + s seconds). Accident response functions must be provided.

[Purpose of the invention]

An object of the present invention is to solve one or more of the above problems and to provide a protection relay in a short time with a simple configuration. To provide an automatic inspection device for a protective relay device, which can inspect the installation of the protective relay device and individually inspect each piece of hardware (input section, performance section 1, and output section) constituting the protection relay device. There is a particular thing.

[Key points of the invention]

The present invention also provides an inspection signal generating means for supplying an input section inspection signal to an input section.

Controlling the inspection signal generation means to supply the input section inspection signal to the input section? ! , i@.

A function for supplying an output section inspection signal to the output section, and a function for inspecting the input section using No. 48 outputted from the input section in response to the input section inspection signal.

It is provided with an arithmetic unit having a function of inspecting the output unit by a signal outputted from 11h 苧中-h 戟楜楠田~5L- ウカツ 1-TEPO■h1 Yuyugen≠) and a self-inspection function.

[Embodiments of the invention]

FIG. 2 shows the configuration of a modification of a protective relay device incorporating an automatic inspection device according to the present invention.

As shown in Fig. 2, 21 is an analog input section, which has a plurality of auxiliary transformers whose primary windings receive voltage input from the power grid, and whose primary windings receive current input from the power grid. A plurality of auxiliary transformers, a secondary winding of each auxiliary transformer, an analog filter connected to the secondary winding of each auxiliary transformer, a sample hold circuit connected to the output end of each analog filter, and each sample A multiplexer that inputs the output signal of the hold circuit, an A/D converter that A/D converts the output signal (analog) of the multiplexer, and an operation that stores the output signal (digital) of the A/D converter by -1 to be described later. Reference numeral 622 denotes an arithmetic operation section, which includes a microcomputer having a judgment calculation function.

Reference numeral 23 denotes an output section, which has a number of output relays corresponding to the number of inputs from the power system to the analog input section 21, and its output contacts are connected to a circuit that gives a trip command.

Reference numeral 24 denotes an inspection signal generating means, which is connected to the analog input section 2.
Input the inspection signal to 1.

In the analog input section 21, an inspection signal is inputted in the following manner. In other words, when there is no grid fault, the phase or line voltage at the power input is almost the rated voltage (for example, 10V), and the current input is at the load current (relatively small), and the zero-phase The voltage and current inputs are almost zero. In the event of a system fault, the phase voltage,
The fault phase of the line voltage decreases, and the current input, zero-sequence voltage, and zero-sequence illumination increase.

Regarding voltage input, the rated AC voltage, that is, a value close to the maximum input, is always applied.

By calculating the effective value in the calculation unit 22, the voltage input circuit components in the input unit 21 and the input unit 2
1 and the M calculating section 22 during operation (note that in the event of an accident, the human power value decreases, so this can also be monitored).

As for the current and zero-phase inputs, they always have only minute inputs, so if the input circuit components are short-circuited or disconnected, even if there is a system fault, the control circuit 22 will not be affected by ±
This is why there is only 0 input.

By supplying 1"A to the current input circuit (the same applies to the zero-phase current input circuit), for example, the inspection signal from the inspection power supply as an inspection signal generation means shown in FIG. That is, as shown in FIG.
2B and the main current transformer 2 connected to the power system 101
7. The inspection power supply 2 is connected to the current input to the secondary winding 5B of the auxiliary current transformer 25 via the primary winding 5A of the auxiliary current transformer 25.
TrLbs for inspection from 8 is superimposed (note that since the secondary impedance of the main current transformer 27 is very large, most of the current for 1 inspection flows to the secondary winding 5B), and this inspection signal is generated. A contact 27, a check V, and a source 28 constitute the means 24.

It is controlled by a signal from the calculation section 22.

Regarding the main phase voltage input, the input from the power system is separated from the zero-phase voltage input circuit by an appropriate initial means controlled by the signal from the calculation unit 22,
Apply the inspection voltage from ft2B to the auxiliary transformer connected to the input end of the zero-phase voltage input circuit.

In response to the inspection current and voltage manually input to the analog input section 21 as described above, the signal output from the analog input section 2] is converted into a predetermined inspection input setting value in the calculation section 22. By comparison, the quality of each input circuit in the analog input section 21 is determined. As a result, the analog input section 21. Inspection signal generation means 24 for supplying inspection current and voltage to the analog input section 21. It is possible to determine whether the cable connecting the analog input section 21 and the calculation section 22 is good or bad.

In the arithmetic unit 22, a built-in microcomputer performs checks on the memory and digital signal output circuit, as well as an instruction execution check (operation check on the microcomputer, etc.). Actually supplement... J relay contact (
Example 2 (Fig. 1, 9A)
m5) in the analog input section 21. This is carried out by utilizing an extremely short idle time during inspection work, such as from when an inspection input application command as described later is issued to the inspection signal generation means 24 until the inspection signal is input to the analog input section 21. be able to.

In the output section 23, the output relay driving signal from the calculation section 22 (unrelated to the signal from the analog input section 21)
Drives the output relay based on. By detecting the opening and closing of the contacts of the output relay in the calculation unit 22, the output part of the calculation unit 22, the cable connecting the calculation unit 22 and the output unit 23, the output relay, and the cable connecting the output relay contact and the calculation unit 22 are detected. It is possible to judge whether it is good or bad.

〔Effect of the invention〕

As explained above, according to the present invention, a relay device that cannot be maintained can be inspected in an extremely short period of time.

Further, according to the present invention, each part constituting the protection relay device is individually and independently inspected, so that a faulty part can be quickly and reliably discovered. Furthermore, +,' according to the invention, inspection can be done in a short time.

No. 19 corresponding functions can be omitted, and an inexpensive device can be provided.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional automatic inspection device for a protective relay device, Fig. 2 is a configuration diagram of a modification of a protection relay device incorporating the automatic inspection device according to the present invention, and Fig. 3 is a circuit diagram of a conventional automatic inspection device for a protection relay device. FIG. 3 is a circuit diagram of such an inspection signal generating means. 21... Input section, 22... Arithmetic section, 23... Output section. 24...Inspection signal generation means. ○ Figure 2 Figure 3

Claims (1)

[Scope of Claims] Inspection signal generation means for supplying an input section inspection signal to an input section; and a function of controlling the inspection signal generation means so as to supply the input section inspection signal to the input section; a function of supplying an output section inspection signal to the output section; a function of inspecting the input section using a signal output from the input section in response to the input section inspection signal; and a function of inspecting the input section in response to the output section inspection signal. An automatic inspection device for a protective relay device, comprising: an arithmetic section having a function of inspecting the output section using a signal output from the output section and a self-inspection function.