JPS5839964A - Simplified relay testing device - Google Patents
Simplified relay testing deviceInfo
- Publication number
- JPS5839964A JPS5839964A JP13910981A JP13910981A JPS5839964A JP S5839964 A JPS5839964 A JP S5839964A JP 13910981 A JP13910981 A JP 13910981A JP 13910981 A JP13910981 A JP 13910981A JP S5839964 A JPS5839964 A JP S5839964A
- Authority
- JP
- Japan
- Prior art keywords
- voltage regulator
- relay
- resistance
- current
- adjusting
- 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.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 229920000742 Cotton Polymers 0.000 claims 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
Classifications
-
- 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
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、ビル屋上や屋外キユービクルに設備されて
いる高圧受電装置の過電流および高圧地絡継電器の試験
装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a testing device for overcurrent and high voltage ground fault relays of high voltage power receiving devices installed on building rooftops and outdoor cubicles.
従来のこの種試験装置は、矛１図に示すように電源抵抗
部（６）および計器操作部０３）から寿っており、この
電源抵抗部（４）は調整抵抗と電圧調整器が直列に接続
され、抵抗と電圧の変化により各電流値を設定している
。仁の関係を矛／図に基づいて詳述する。As shown in Figure 1, the conventional test equipment of this type consists of a power supply resistance section (6) and an instrument operation section 03), and this power supply resistance section (4) has an adjustment resistor and a voltage regulator connected in series. The current value is set by changing the resistance and voltage. The relationship between jin and jin is explained in detail based on the spear/diagram.
矛７図において（１）は単相１０ＯＶ端子、（２）はノ
ーヒユーズブレーカ−（ＮＦＢ） 、 （３１はパイロ
ットランプ、（４）は微調整用電圧調整器、（５）は粗
調整用抵抗。In Figure 7, (1) is a single-phase 10OV terminal, (2) is a no-fuse breaker (NFB), (31 is a pilot lamp, (4) is a voltage regulator for fine adjustment, and (5) is a resistor for coarse adjustment. .
（６）は地絡用調整用抵抗、（７）はオン用電源スィッ
チ。(6) is the ground fault adjustment resistor, and (7) is the power switch for turning on.
（８）はオフ用電源スィッチ、（９）は補助リレー、ａ
ｌはその接点、ａυは電流メーター、（１３は電圧メー
ター。(8) is the power off switch, (9) is the auxiliary relay, a
l is the contact point, aυ is the current meter, (13 is the voltage meter.
（１３はセコンドカウンター、α尋はセコンドカウンタ
ースイッチ、 （１９は過電流継電器の接続端子、 Ｑ
ｌは高圧地絡継電器の接続端子をそれぞれ示す。(13 is the second counter, α fathom is the second counter switch, (19 is the connection terminal for the overcurrent relay, Q
l indicates the connection terminal of the high-voltage ground fault relay, respectively.
尚（ｏｏＲ）は過電流継電器ｅ （ＧＲ）は高圧地絡
継電器、 （ＺＯＴ）は地絡変流器、（Ｃ１，０１）
は過電流継電器の接続端子、 （＆ｘ、ｌ＊）は高圧
地絡継電器の接続端子を示す。(ooR) is overcurrent relay e (GR) is high voltage ground fault relay, (ZOT) is ground fault current transformer, (C1,01)
indicates the connection terminal of the overcurrent relay, and (&x, l*) indicates the connection terminal of the high voltage ground fault relay.
次に矛／図試験装置の作用を説明する。Next, the operation of the spear/figure test device will be explained.
（１）過電流継電器の試験について
ａ、単相１００’ｌ端子（１）を入力電源（図示せず）
に接続し、パイロットランプ（２）の点灯によシ受電の
有無を確認する。(1) Regarding the overcurrent relay test a. Input the single-phase 100'l terminal (1) into the power supply (not shown)
Connect to the power supply and check whether power is being received by lighting the pilot lamp (2).
ｂ、過電流継電器（ＯＣＲ）を矛１図の点線のように試
験装置の過電流継電器接続端子α９に接続する。b. Connect the overcurrent relay (OCR) to the overcurrent relay connection terminal α9 of the test device as shown by the dotted line in Figure 1.
Ｃ１電源スィッチ（７）をオンにし、補助リレー（９）
を作動させてその接点α〔を閉じ、粗調農用抵抗（５）
のダイヤルと微調整用電圧調整器（４）のダイヤルによ
シ、指定電流値を設定する。この場合、電流設定中退電
流継電器（００Ｒ）が動作しないようこの継電器の円盤
（図示せず）を手で押えておく。セコンドカウンタース
イッチａ４は開放したま＼にする。Turn on the C1 power switch (7) and turn on the auxiliary relay (9).
Activate and close its contact α, coarse adjustment agricultural resistor (5)
Set the specified current value using the dial and the dial of the fine adjustment voltage regulator (4). In this case, hold down the disc (not shown) of the current setting dropout current relay (00R) with your hand so that it does not operate. Leave the second counter switch a4 open.
ｄ、微調整用電圧調整器（４）のダイヤルによって規定
電流値罠なったら電源スィッチ（８）をオフにし、過電
流継電器（ＯＯＸ）の円盤（図示せず）から手を離す。d. When the dial of the fine adjustment voltage regulator (4) reaches the specified current value, turn off the power switch (8) and release the overcurrent relay (OOX) disc (not shown).
ついでセコンドカウンタースイッチＩを投入してから電
源スィッチ（７）をオンにし、過電流継電器（ＯＯＲ）
の動作によシ蓮断器をトリップさせてこの時の時限をセ
コンドカウンター（１３にょシ測定（限時測定）する。Next, turn on the second counter switch I, turn on the power switch (7), and turn on the overcurrent relay (OOR).
This action causes the lotus cutter to trip and the time limit at this time is measured using a second counter (13).
一０始動電流測定は、調整抵抗（５）のダイヤルを規定
値附近にセット、し微調整用電圧調整器（４）のダイヤ
ルによって電流値を徐々に上けて過電流継電ａ＝ （Ｏ
ＯＲ）の動作を確認する。10 To measure the starting current, set the dial of the adjustment resistor (5) near the specified value, then gradually increase the current value with the dial of the fine adjustment voltage regulator (4) to detect overcurrent relay a = (O
Check the operation of OR).
この場合セコンドカウンタースイッチａ４は開放してお
く。In this case, the second counter switch a4 is left open.
（２） 高圧地絡継電器について
ａ、単相１００Ｎ端子（１）を入力電源（図示せず）Ｋ
接続し、パイロットランプ（２）の点灯によシ受電の有
無を確認する。(2) Regarding the high voltage ground fault relay a, input the single phase 100N terminal (1) to the power supply (not shown) K
Connect it and check whether power is being received by lighting the pilot lamp (2).
ｂ、高圧地絡継電器（ＧＲ）を、１−７図の点線のよう
に試験装置の高圧地絡継電器接続端子（１６１に接続す
る。b. Connect the high voltage ground fault relay (GR) to the high voltage ground fault relay connection terminal (161) of the test device as shown by the dotted line in Figures 1-7.
Ｃ０地絡継電器用調整抵抗（粗調整）（６）のダイヤル
を指定値にセットする。Set the dial of C0 ground fault relay adjustment resistance (coarse adjustment) (6) to the specified value.
ｄ、微調整用電圧調整器（４）のダイヤルによってタッ
プ電流値近くまで電流を上昇させて、高圧地絡継電器（
ＧＲ）の動作により遮断器をトリップさせる。d. Increase the current to near the tap current value using the dial of the fine adjustment voltage regulator (4), and connect the high voltage ground fault relay (
GR) causes the circuit breaker to trip.
−１この時の電流値を電流計αυから読み取υ記碌する
。-1 Read the current value at this time from the ammeter αυ and record υ.
このように従来の試験装置は、電源抵抗部と計器操作部
が別体であるのできわめて大型であるば′・かシでなく
、調整抵抗と電圧調整器が直列に接続されているため各
電流値の設定に際し電圧調整器の負担が大きく、この結
果大容量の電圧調整器が必要となシ、重量も大きくなっ
て携帯用試験装置としては不都合のものであった。In this way, conventional test equipment has a power supply resistance section and a meter operation section that are separate, so it is not very large, but because the adjustment resistor and voltage regulator are connected in series, each current When setting the value, the burden on the voltage regulator is large, and as a result, a large-capacity voltage regulator is required, and the weight is also large, which is inconvenient as a portable testing device.
この発明線、試験装置の回路接続に改良を施すことによ
って従来装置の不都合を解消することを目的とする。The purpose of this invention is to eliminate the inconveniences of conventional equipment by improving the circuit connection of the testing equipment.
この発明の構成は、電源に対し抵抗切替器に接続された
粗調整用抵抗と微調整用電圧調整器が並列接続されると
＼もに、この電圧調整器の出力が電流メータおよび調整
または試験切替スイッチを介して被試験“継電器の接続
端子に供給され、かつ、前記切替スイッチにセコンドカ
ウンタが接続されたことを％愼とする。。The configuration of the present invention is such that when a coarse adjustment resistor connected to a resistance switcher and a fine adjustment voltage regulator are connected in parallel to the power supply, the output of this voltage regulator is connected to a current meter and an adjustment or test It is assumed that the voltage is supplied to the connection terminal of the relay under test via the changeover switch, and that the second counter is connected to the changeover switch.
る・
（１）は電源端子、（２）は電源端子（１）の一方とア
ース間に接続されたパイロットランプ、（３）はノーヒ
ユーズブレーカ−ＣＭＦＢ）＃ （４）は複数組の抵抗
器からなる粗調整用抵抗、（５）はこれらの抵抗器を切
替える抵抗切替器、（６）は微調整用電圧調整器（単巻
変圧器）、（７）は過電流継電器試験用電流メーター。(1) is the power terminal, (2) is the pilot lamp connected between one of the power terminals (1) and ground, (3) is the no-fuse breaker - CMFB) # (4) is multiple sets of resistors (5) is a resistance switcher for switching these resistors, (6) is a fine adjustment voltage regulator (autotransformer), and (7) is a current meter for overcurrent relay testing.
（８）は高圧地絡継電器試験用電流メーター、（９）は
セコンドカウンター、舖はセコンドカウンタースイッチ
、ａυは調整または試験に切替える切替スイッチ、ａの
は被試験機器である過電流継電器（図示せず）の接続端
子、α騰は被試験機器である高圧地絡継電器（図示せず
）の接続端子をそれぞれ示す。(8) is a current meter for high-voltage ground relay testing, (9) is a second counter or second counter switch, a is a changeover switch for adjusting or testing, and a is an overcurrent relay that is the equipment under test (not shown). The connection terminals shown in (a) and (a) and (a) respectively represent the connection terminals of a high-voltage ground fault relay (not shown), which is the equipment under test.
こへで抵抗切替器（５）を介して調整用抵抗（４）と微
調整用電圧調整器（６）を並列に接続しているので定め
られた抵抗値に対し電圧調整器（単巻変圧器）（６）の
二次側逆方向電流を利用し、設定抵抗量に対する電流な
減流すなわち電圧低下をさせることにより、必要な出力
電流を増加させることができる。Here, the adjustment resistor (4) and fine adjustment voltage regulator (6) are connected in parallel via the resistance switch (5), so the voltage regulator (autotransformer) The required output current can be increased by using the secondary side reverse current of (6) to reduce the current, or lower the voltage, relative to the set resistance.
次に過電流継電器および高圧地絡電器の試験についての
べる。Next, we will discuss testing of overcurrent relays and high voltage ground faults.
（ハ、過電流継電器の試験について。(C. Regarding overcurrent relay testing.
α、電源端子（１）を電源に接続し、パイロットランプ
（２）により電源入力の極性を確認する。α, Connect the power terminal (1) to the power source and check the polarity of the power input using the pilot lamp (2).
邊、接続端子αのに過電流継電器（図示せず）を接続す
る。Connect an overcurrent relay (not shown) to the connecting terminal α.
Ｃ９抵抗切替器（５）のダイヤルにより粗調整用抵抗の
抵抗値をセットすると共に微調整用電圧調整器（単巻変
圧器）（６）の可動片をセットすることにより、指定電
流値を設定する。この場合切替スイッチＱｌ）を調整側
に入れておく（過電流継電器の円盤を、１−１図のよう
に手で押える必要はない）、セコンドカウンタースイッ
チ（ＩＧは投入したまへにする。Set the specified current value by setting the resistance value of the coarse adjustment resistor using the dial of the C9 resistance switch (5) and by setting the movable piece of the fine adjustment voltage regulator (autotransformer) (6). do. In this case, set the changeover switch Ql) to the adjustment side (there is no need to press the overcurrent relay disc by hand as shown in Figure 1-1), and leave the second counter switch (IG) turned on.
ｄ、微調整用電圧調整器（単巻変圧器）（６）の可動片
の移動により規定電流値になったら、ただちに切替スイ
ッチαυを試験側に切替え、過電流継電器（図示せず）
を動作させることによりしゃ断器をトリップさせて、こ
の時の時限をセコンドカウンター（９）により測定（限
時測定）する、この場合セコンドカウンター（９）は自
動的に動作を開始する。d. When the specified current value is reached by moving the movable piece of the fine adjustment voltage regulator (autotransformer) (6), immediately switch the changeover switch αυ to the test side and connect the overcurrent relay (not shown).
The breaker is tripped by operating the circuit breaker, and the time limit at this time is measured by the second counter (9) (time limit measurement). In this case, the second counter (9) automatically starts operating.
一９始動電流測定は切替スイッチαＩ）を試験ｆｌＩＩ
Ｋ切替え粗調整用抵抗（４）の値か最小値になるよ５に
抵抗切替器（５）によりセットし、微調整用電圧調整器
（単巻変圧器）（６）によって電流値を徐々に上げて、
過電流継電器（図示せず）の動作を確認する。この場合
セコンドカウンタースイッチ顛は開放しておく。19 Starting current measurement tests changeover switch αI)flII
Set the value of the coarse adjustment resistor (4) to 5 using the resistance switch (5), and gradually increase the current value using the fine adjustment voltage regulator (autotransformer) (6). Raise,
Check operation of overcurrent relay (not shown). In this case, leave the second counter switch open.
−）、高圧地絡継電器の試験について、Ｇ、電源端子（
１）を電源に接続し、パイロットランプ（２）により・
電源入力の極性を確認する。-), Regarding testing of high voltage ground fault relays, G, Power terminal (
1) to the power supply, and the pilot lamp (2)
Check the polarity of the power input.
ｂ、接続端子（１３に高圧地絡継電器（図示せず）を接
続する。b. Connect a high voltage ground fault relay (not shown) to the connection terminal (13).
Ｃ２抵抗切替器（５）のダイヤル１ｆｔｌｒＣ地絡試験
）（図示せず）の位置に七ツＦする・
ｄ、微調整用電圧調整器（単巻変圧器）（６）の可動片
を移動することによって、タップ電流値近くまで電流を
上昇させて、高圧地絡継電器（図示せず）の動作により
しゃ断器ヲトリップさせる。Move the dial of the C2 resistance switcher (5) to the 1ftlrC ground fault test) (not shown) position. d.Move the movable piece of the fine adjustment voltage regulator (autotransformer) (6) This causes the current to rise close to the tap current value, causing the breaker to trip due to operation of a high voltage ground fault relay (not shown).
−２この時の電流値な電流メーター（８）から読み取り
記録する。-2 Read and record the current value at this time from the current meter (8).
以上のようにこの発明は、計器操作部と電源抵抗部を一
体（ｌセット）に構造上作製することができるので、試
験装置を極めて小型にでき、そして粗調整用抵抗と微調
整用電圧調整器を並列に接続しかつ出力電流の設定の主
体を粗調整用抵抗の複数組の抵抗器の切替えによるもの
としたので、電圧調整器の負担は１分路回路により分流
されるため、微調整分の補充電流にすぎなくなり、この
結果電圧調整器は小容量ですむと共に極めて小型になる
ことにより、試験装置全体を小屋軽量化することができ
る。また従来の試験装置は操作取扱いか複雑であるのに
比し、この発明の試験装置はそれが著しく簡便である。As described above, in this invention, the instrument operation section and the power supply resistance section can be structurally manufactured as one unit (one set), so the test apparatus can be made extremely compact, and the coarse adjustment resistor and fine adjustment voltage adjustment Since the voltage regulators are connected in parallel and the output current is mainly set by switching between multiple sets of coarse adjustment resistors, the load on the voltage regulator is shunted by one shunt circuit, making fine adjustment possible. As a result, the voltage regulator has a small capacity and is extremely compact, making it possible to reduce the weight of the entire test apparatus. Furthermore, while conventional testing devices are complicated to operate, the testing device of the present invention is extremely simple.
矛１図は従来の簡易継電器試験装置の回路図。
１１図はこの発明の簡易継電器試験装置の回路図を示す
。
１１図において、
（４）は複数組の抵抗器からなる粗調整用抵抗。
（５）は抵抗切替器。
（６）は微調整用電圧調整器（単巻変圧器）（７）は過
電流継電器試験用電流メーター。
（８）は高圧地絡継電器試験用電流メーター。
（９）はセ；ンドカウンター。
卸は調整または試験切替スイッチ。
（Ｉ３は過電流継電器の接続端子。
ＱＩ家高圧地絡継電器の接続端子、 −特許出願人
冨 岡 信 明Figure 1 is a circuit diagram of a conventional simple relay testing device. FIG. 11 shows a circuit diagram of the simple relay testing device of the present invention. In Figure 11, (4) is a rough adjustment resistor consisting of multiple sets of resistors. (5) is a resistance switch. (6) is a voltage regulator for fine adjustment (autotransformer) and (7) is a current meter for overcurrent relay testing. (8) is a current meter for high voltage ground fault relay testing. (9) is the second counter. Wholesale is an adjustment or test changeover switch. (I3 is the connection terminal of the overcurrent relay. Connection terminal of the QI high voltage ground fault relay, - Patent applicant
Nobuaki Tomioka
Claims (3)
抗と微調整用電圧調整器が並列接続されると＼もに、こ
の電圧調整器の出力が電流メータ及び調整または試験切
替スイッチを介して被試験綿ｔ＠の接続端子に供給され
、かつ、前記切替スイッチにセブンドカウンタが接続さ
れたことを特徴と、する簡易継電器試験装置。(1) When the coarse adjustment resistor connected to the resistance switch and the fine adjustment voltage regulator are connected in parallel to the power supply, the output of this voltage regulator is connected to the current meter and the adjustment or test changeover switch. A simple relay testing device, characterized in that the cotton under test is supplied to the connection terminal of the cotton t@ via the switch, and a seventh counter is connected to the changeover switch.
よび高圧地絡継電器に接続されることを特徴とする特許
請求の範囲牙１項記載の簡易継電器試験装置。(2) The simple relay testing device according to claim 1, characterized in that it is connected to the *a terminal of the relay under test, an overcurrent relay, and a high voltage ground fault relay.
ータおよび高圧地絡継電器試験用電流メータからまると
とを特徴とする特許請求の範囲２１項記載の簡易継電器
試験装置。(3) The simple relay testing device according to claim 21, wherein the current meter includes a current meter for testing an overcurrent relay and a current meter for testing a high voltage ground fault relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13910981A JPS5839964A (en) | 1981-09-02 | 1981-09-02 | Simplified relay testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13910981A JPS5839964A (en) | 1981-09-02 | 1981-09-02 | Simplified relay testing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5839964A true JPS5839964A (en) | 1983-03-08 |
| JPH0130427B2 JPH0130427B2 (en) | 1989-06-20 |
Family
ID=15237691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13910981A Granted JPS5839964A (en) | 1981-09-02 | 1981-09-02 | Simplified relay testing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5839964A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62182798A (en) * | 1986-02-06 | 1987-08-11 | ヤマハ株式会社 | Parameter setter for electronic musical apparatus |
| JPS63270U (en) * | 1986-03-06 | 1988-01-05 | ||
| JPS63137296A (en) * | 1987-01-17 | 1988-06-09 | ヤマハ株式会社 | Electronic musical instrument |
| JP2010043873A (en) * | 2008-08-08 | 2010-02-25 | Togami Electric Mfg Co Ltd | Device of testing ground fault relay |
| US10215809B2 (en) * | 2015-11-24 | 2019-02-26 | Carrier Corporation | Method and system for verification of contact operation |
-
1981
- 1981-09-02 JP JP13910981A patent/JPS5839964A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62182798A (en) * | 1986-02-06 | 1987-08-11 | ヤマハ株式会社 | Parameter setter for electronic musical apparatus |
| JPS63270U (en) * | 1986-03-06 | 1988-01-05 | ||
| JPS63137296A (en) * | 1987-01-17 | 1988-06-09 | ヤマハ株式会社 | Electronic musical instrument |
| JP2010043873A (en) * | 2008-08-08 | 2010-02-25 | Togami Electric Mfg Co Ltd | Device of testing ground fault relay |
| US10215809B2 (en) * | 2015-11-24 | 2019-02-26 | Carrier Corporation | Method and system for verification of contact operation |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0130427B2 (en) | 1989-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3678372A (en) | Portable circuit breaker tester for calibrating a circuit breaker over a wide range of current | |
| CN111487469A (en) | Current transformer secondary circuit contact resistance live detection device | |
| CN111487466A (en) | Electrified detection device for direct current resistance of secondary circuit of current transformer | |
| JPS5839964A (en) | Simplified relay testing device | |
| KR930010685B1 (en) | Circuit breaker | |
| US2366505A (en) | Charging apparatus for storage batteries | |
| US2509027A (en) | Overload protection for meters | |
| US5144227A (en) | Digital high-voltage meter for detecting a load to source voltage and a neutral position of a utility voltage regulator | |
| CN112230158A (en) | Power grid integrated power supply testing device | |
| GB1005941A (en) | Improvements relating to testing devices for testing protective switches | |
| US4323838A (en) | RMS Controlled load tap changing transformer | |
| CN209784498U (en) | AC and DC switch electronic trip unit calibrator | |
| CN213210413U (en) | Integrated power supply comprehensive testing device | |
| US3166705A (en) | Automatic voltage control for electrical precipitators | |
| CN212989528U (en) | Multi-branch temperature rise test device | |
| CN210155270U (en) | Handheld portable current loop impedance and current type relay tester | |
| US2057472A (en) | Current interrupter equipment | |
| US2376775A (en) | Electrical testing equipment | |
| KR890000624Y1 (en) | Power relay tester | |
| US2947937A (en) | Test set for checking relays | |
| US2605455A (en) | Battery charger | |
| CN121254134A (en) | Low-voltage leakage protection comprehensive test device and method | |
| US3735252A (en) | Automatic tester for testing resistance and inductance of coil windings | |
| US2555306A (en) | Wiring analyzer | |
| JP3053668U (en) | Adapter for overcurrent relay tester |