Vanguard Transformer Resistance Meter & Trip Saver Box

Agency:	Grand River Dam Authority
State:	Oklahoma
Type of Government:	State & Local
NAICS Category:	334515 - Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals
Posted Date:	Mar 6, 2025
Due Date:	Mar 19, 2025
Solicitation No:	RFQ 2702
Original Source:	Please Login to View Page
Contact information:	Please Login to View Page
Bid Documents:	Please Login to View Page

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ADMINISTRATION

PO Box 669

Chouteau, OK 74337

Solicitation Cover Page

1. Solicitation #: 2702

2. Solicitation Issue Date: 3/6/25

3. Brief Description of Requirement:

Vanguard Transformer Resistance Meter & Trip Saver Box

4. Response Due Date: 3/19/25

Time: 2:00 PM CT

5. Contracting Officer:

Name: Paul Proctor

Phone: 405-297-9963, ext. 6

Cell: 918-500-0198

Email: paul.proctor@grda.co

ADMINISTRATION

PO Box 669

Chouteau, OK 74337

This is a standard bid process. Please submit your bid via email to

paul.proctor@grda.com by March 19, 2025 at 2:00 PM CST. All questions must be

submitted in writing via email by March 17, 2025 at 2:00 PM CST.

A completed non-collusion certificate is required and must be submitted with your bid if

pricing is over $5,000.00.

The RFQ pricing and vendor information form must be completed and signed by an

authorized representative of your company in the space provided in the lower right-hand

corner.

Please review all technical specifications and bidding instructions carefully for bid

submission requirements. Bids which are incomplete and/or missing required

documentation may be considered non-conforming and disqualified from evaluation.

EVALUATION

The award to the successful bidder will be based on the best value bid received that meets

the specifications listed below and the requirements herein. This includes, but is not

limited to, the following in no order of precedence: price, delivery, adherence to

specifications and ability to meet the needs of the project.

Where specifications or drawings identify an item of material or equipment by

manufacturer's name and model/type, "or equal", products of equal quality and

performance by other manufacturers may be substituted provided that such substitution is

of equal design and quality, and that this substitution is acceptable to GRDA.

Only the brand name, model, and part number(s) will be accepted for any items listed that

include the designation “sole brand” or “no sub.” Bidder must identify if they are an

authorized distributor for this item and if manufacturer warranty applies to this purchase.

Bidder must also identify if item being bid is refurbished or new.

GRDA will take into consideration past performance and delivery lead times in the

evaluation.

Preference may be given to vendors that accept GRDA’s Terms & Conditions and

EPay as method of payment if analysis estimates that such appears to result in a

lower cost to GRDA. Additional payment terms may also be taken into

consideration in the analysis process.

***** Please read the General Bidding Instructions, Terms and Conditions, and

complete the exception statement attached at the end of the RFQ. *****

TRM-203/403

transformer resistance meters

TRM-203/403

transformer resistance meters

Product Overview

The TRM-203 and TRM-403 are three phase transformer

winding resistance meters that allow the user to con-

nect all test cables to the transformer bushings. The

unit will then measure the transformer resistance value

for each of the phases without the need to disconnect

and reconnect cables for each phase.

The TRM-203/403 can provide fast and stable readings

of very large transformers by utilizing a 60Vdc power

supply. The TRM-203 is capable of outputting a select-

able test current from 1A to 20A while the TRM-403‘s

test current is selectable from 1A to 40A.

Since both units can accurately measure resistance

from 1 micro-ohm to 500 Ohms (up to 2000 Ohms for

the TRM-203), they can be used as micro-ohmmeters to

measure EHV circuit breaker contact resistance, or for

any low resistance measuring application.

For a Delta transformer, the TRM-203/403 can measure

the phase resistance readings and provide the individual

Delta winding resistance values. The TRM-203/403 can

also provide the individual winding resistance values for

a Wye transformer without the neutral terminal.

If the transformer winding resistance temperature is

available at the time of testing, the TRM-203/403 can

calculate the equivalent resistance value at any temper-

ature value. This useful feature can be used to compare

the field readings against factory test resistance values.

A special test mode allows the TRM-203/403 to collect

data automatically for up to 90 minutes at a 60-second

sampling interval (10, 15, 20, and 30 second sampling

rates are also available. Duration will vary accordingly).

Test data is recorded with a time stamp.

All test results can be printed on the unit’s built-in 2.5”

wide thermal printer. Test record header information

including the Company, substation name, transformer

information, and operator name can also be entered.

The TRM-203/403 can automatically demagnetize the

inductive device under test, eliminating the manual task

of demagnetizing the transformer core after a resis-

tance test.

The TRM-203/403 also has a “make-before-break” test

mode that can be used to test the Load Tap Changer

(LTC) or Voltage Regulator contact test sequence. The

TRM-203/403 produces a “Dynamic-Resistance” graph

of the LTC or Voltage regulator contact under operation.

An opened contact can be detected visually from this

resistance chart.

The TRM’s built-in LTC/Voltage regulator can be used to

conveniently change the LTC/voltage regulator tap posi-

tion from the TRM-203/403 front panel.

User Interface

The TRM-203/403 features a back-lit graphic LCD

screen (240 x 128 pixels) that is clearly visible in

both bright sunlight and low light levels. A 44-

key “QWERTY”-style membrane keypad is used to

enter test information and operate the unit.

Computer Interface

The TRM-203/403 can be connected to a PC via

the unit’s RS-232C, USB, or Bluetooth interface.

A PC can be used to control the TRM-203/403

to perform transformer resistance tests. Test

records (stored in the TRM-203/403 or a USB

Flash drive) can also be retrieved, reviewed,

and printed. Test records are automatically ex-

ported to PDF, Excel, and XML formats.

Safety Features

The TRM-203/403 automatically dissipates the

energy stored in the transformer at the end of

each test. The discharge circuit will continue

to work even if the TRM-203/403 power supply

is lost.

Test Record Storage

The TRM-203/403 can store up to 256 static test

records (111 tests per record) and 120 dynamic

test records internally. For external test record

storage, the TRM-203/403 features a USB Flash

drive interface port. Up to 999 test records can be

stored on a connected USB Flash Drive.

outstanding features

• Perform three phase test on a transformer

without the need to switch cables

• Can provide individual Delta winding

resistance values

• Can provide individual Wye (with no

neutral) winding resistance values

• Demagnetize transformer after test

• Selectable test current from 1A to 20A

(TRM-203) and 1A to 40A (TRM-403)

• Computer control via RS-232C, USB, or

bluetooth wireless interface

• Built-in 2.5” wide thermal printer

ordering information

Part No. Description

9060-UC TRM-203, cables, and PC software

9006-UC TRM-403, cables, and PC software

TP3-CS TP3 thermal printer paper

(36 rolls)

TRM-203/403 connections

Thermal Printer Output

TRM-203/403 Features

5" back-lit bluetooth

LCD screen status indicator

LTC

control

rugged

keypad

power

switch

ground

stud

RS-232C

PC interface

USB PC

interface

USB flash

drive interface

connection

terminals

LTC

high voltage transformer

control presence discharge

buttons indicator indicator

2.5” wide

thermal

printer

TRM-203/403 technical specifications

physical

Dimensions: 21”W x 17”H x 9” D (53 cm x 43 cm x 24 cm)

specifications Weight: 35 lbs. (15.8 Kg)

resistance TRM-203: 1 micro-ohm ¬ 2,000 ohms

reading range TRM-403: 1 micro-ohm ¬ 500 ohms

accuracy

1 ¬ 19,999 micro-ohms: ±0.5% reading, ±1 count

20 ¬ 999 milliohms: ±1% reading, ±1 count

1 ¬ 2,000 ohms: ±1.5% reading, ±1 count

display

5" back-lit LCD screen (240 x 128 pixels)

viewable in bright sunlight and low-light levels

printer

built-in 2K” wide thermal printer

software

Windows®-based software is included with purchase price

100 internal test 256 static test records (each can contain up to 111 readings) and 120

010

110

record storage dynamic test records

external

up to 999 test records on external USB flash drive (drive not included)

data storage

temperature Operating: -10°C to +50°C (+15°F to +122°F)

Storage: -30°C to +70°C (-22°F to +158°F)

cables

four 50-foot (15.24m) test cables, one LTC control cable, one ground

cable, one power cord, one USB cable

options

shipping case

input

power

test

currents

input

channels

100 ¬ 240 Vac, 50/60 Hz

TRM-203: 1A ¬ 25A in 1A increments

TRM-403: 1A ¬ 40A in 1A increments

4 input channels for measuring

resistance

test

voltage

60 Vdc charging,

18 Vdc max during measurement

ac current

input

clamp-on current sensor, 1 ¬ 20 A

computer

interfaces

one RS-232C port, one USB port, one USB

flash drive port, bluetooth

load tap changer designed to meet IEC 61010 (1995), UL

contact

61010-a, and CAS-C22.2 standards

safety

designed to meet UL 61010A-1 and CAN/

CSA C22.2 No. 1010.1-92 standards

humidity

90% RH @ 40°C (104°F)

non-condensing

altitude

2,000 m (6,562 ft)

to full safety specifications

warranty

one year on parts and labor

NOTE : the above specifications are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifications are subject to change without notice.

This page summarizes the opportunity, including an overview and a preview of the attached documents.

Vanguard Transformer Resistance Meter & Trip Saver Box

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